Adding upstream version 2.1.30.upstream/2.1.30upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 4673 insertions, 0 deletions

diff --git a/src/printer_tree.c b/src/printer_tree.c
new file mode 100644
index 0000000..6a7e7ce
--- /dev/null
+++ b/src/printer_tree.c
@@ -0,0 +1,4673 @@
+/**
+ * @file printer_tree.c
+ * @author Adam Piecek <piecek@cesnet.cz>
+ * @brief RFC tree printer for libyang data structure
+ *
+ * Copyright (c) 2015 - 2021 CESNET, z.s.p.o.
+ *
+ * This source code is licensed under BSD 3-Clause License (the "License").
+ * You may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://opensource.org/licenses/BSD-3-Clause
+ *
+ * @section TRP_DESIGN Design
+ *
+ * @code
+ *          +---------+    +---------+    +---------+
+ *   output |   trp   |    |   trb   |    |   tro   |
+ *      <---+  Print  +<---+  Browse +<-->+  Obtain |
+ *          |         |    |         |    |         |
+ *          +---------+    +----+----+    +---------+
+ *                              ^
+ *                              |
+ *                         +----+----+
+ *                         |   trm   |
+ *                         | Manager |
+ *                         |         |
+ *                         +----+----+
+ *                              ^
+ *                              | input
+ *                              +
+ * @endcode
+ *
+ * @subsection TRP_GLOSSARY Glossary
+ *
+ * @subsubsection TRP_trm trm
+ * Manager functions are at the peak of abstraction. They are
+ * able to print individual sections of the YANG tree diagram
+ * (eg module, notifications, rpcs ...) and they call
+ * Browse functions (@ref TRP_trb).
+ *
+ * @subsubsection TRP_trb trb
+ * Browse functions contain a general algorithm (Preorder DFS)
+ * for traversing the tree. It does not matter what data type
+ * the tree contains (@ref lysc_node or @ref lysp_node), because it
+ * requires a ready-made getter functions for traversing the tree
+ * (@ref trt_fp_all) and transformation function to its own node
+ * data type (@ref trt_node). These getter functions are generally
+ * referred to as @ref TRP_tro. Browse functions can repeatedly
+ * traverse nodes in the tree, for example, to calculate the alignment
+ * gap before the nodes \<type\> in the YANG Tree Diagram.
+ * The obtained @ref trt_node is passed to the @ref TRP_trp functions
+ * to print the Tree diagram.
+ *
+ * @subsubsection TRP_tro tro
+ * Functions that provide an extra wrapper for the libyang library.
+ * The Obtain functions are further specialized according to whether
+ * they operate on lysp_tree (@ref TRP_trop) or lysc_tree
+ * (@ref TRP_troc). If they are general algorithms, then they have the
+ * prefix \b tro_. The Obtain functions provide information to
+ * @ref TRP_trb functions for printing the Tree diagram.
+ *
+ * @subsubsection TRP_trop trop
+ * Functions for Obtaining information from Parsed schema tree.
+ *
+ * @subsubsection TRP_troc troc
+ * Functions for Obtaining information from Compiled schema tree.
+ *
+ * @subsubsection TRP_trp trp
+ * Print functions take care of the printing YANG diagram. They can
+ * also split one node into multiple lines if the node does not fit
+ * on one line.
+ *
+ * @subsubsection TRP_trt trt
+ * Data type marking in the printer_tree module.
+ *
+ * @subsubsection TRP_trg trg
+ * General functions.
+ *
+ * @subsection TRP_ADJUSTMENTS Adjustments
+ * It is assumed that the changes are likely to take place mainly for
+ * @ref TRP_tro, @ref TRP_trop or @ref TRP_troc functions because
+ * they are the only ones dependent on libyang implementation.
+ * In special cases, changes will also need to be made to the
+ * @ref TRP_trp functions if a special algorithm is needed to print
+ * (right now this is prepared for printing list's keys
+ * and if-features).
+ */
+
+#include <assert.h>
+#include <string.h>
+
+#include "common.h"
+#include "compat.h"
+#include "out_internal.h"
+#include "plugins_exts.h"
+#include "plugins_types.h"
+#include "printer_internal.h"
+#include "printer_schema.h"
+#include "tree_schema_internal.h"
+#include "xpath.h"
+
+/**
+ * @brief List of available actions.
+ */
+typedef enum {
+    TRD_PRINT = 0,  /**< Normal behavior. It just prints. */
+    TRD_CHAR_COUNT  /**< Characters will be counted instead of printing. */
+} trt_ly_out_clb_arg_flag;
+
+/**
+ * @brief Structure is passed as 'writeclb' argument
+ * to the ::ly_out_new_clb().
+ */
+struct ly_out_clb_arg {
+    trt_ly_out_clb_arg_flag mode;   /**< flag specifying which action to take. */
+    struct ly_out *out;             /**< The ly_out pointer delivered to the printer tree module via the main interface. */
+    size_t counter;                 /**< Counter of printed characters. */
+    LY_ERR last_error;              /**< The last error that occurred. If no error has occurred, it will be ::LY_SUCCESS. */
+};
+
+/**
+ * @brief Initialize struct ly_out_clb_arg with default settings.
+ */
+#define TRP_INIT_LY_OUT_CLB_ARG(MODE, OUT, COUNTER, LAST_ERROR) \
+    (struct ly_out_clb_arg) { \
+        .mode = MODE, .out = OUT, \
+        .counter = COUNTER, .last_error = LAST_ERROR \
+    }
+
+/**********************************************************************
+ * Print getters
+ *********************************************************************/
+
+/**
+ * @brief Callback functions that prints special cases.
+ *
+ * It just groups together tree context with trt_fp_print.
+ */
+struct trt_cf_print {
+    const struct trt_tree_ctx *ctx;                             /**< Context of libyang tree. */
+
+    void (*pf)(const struct trt_tree_ctx *, struct ly_out *);   /**< Pointing to function which printing list's keys or features. */
+};
+
+/**
+ * @brief Callback functions for printing special cases.
+ *
+ * Functions with the suffix 'trp' can print most of the text on
+ * output, just by setting the pointer to the string. But in some
+ * cases, it's not that simple, because its entire string is fragmented
+ * in memory. For example, for printing list's keys or if-features.
+ * However, this depends on how the libyang library is implemented.
+ * This implementation of the printer_tree module goes through
+ * a lysp tree, but if it goes through a lysc tree, these special cases
+ * would be different.
+ * Functions must print including spaces or delimiters between names.
+ */
+struct trt_fp_print {
+    void (*print_features_names)(const struct trt_tree_ctx *, struct ly_out *);   /**< Print list of features without {}? wrapper. */
+    void (*print_keys)(const struct trt_tree_ctx *, struct ly_out *);             /**< Print list's keys without [] wrapper. */
+};
+
+/**
+ * @brief Package which only groups getter function.
+ */
+struct trt_pck_print {
+    const struct trt_tree_ctx *tree_ctx;    /**< Context of libyang tree. */
+    struct trt_fp_print fps;                /**< Print function. */
+};
+
+/**
+ * @brief Initialize struct trt_pck_print by parameters.
+ */
+#define TRP_INIT_PCK_PRINT(TREE_CTX, FP_PRINT) \
+    (struct trt_pck_print) {.tree_ctx = TREE_CTX, .fps = FP_PRINT}
+
+/**********************************************************************
+ * Indent
+ *********************************************************************/
+
+/**
+ * @brief Constants which are defined in the RFC or are observable
+ * from the pyang tool.
+ */
+typedef enum {
+    TRD_INDENT_EMPTY = 0,               /**< If the node is a case node, there is no space before the \<name\>. */
+    TRD_INDENT_LONG_LINE_BREAK = 2,     /**< The new line should be indented so that it starts below \<name\> with
+                                             a whitespace offset of at least two characters. */
+    TRD_INDENT_LINE_BEGIN = 2,          /**< Indent below the keyword (module, augment ...).  */
+    TRD_INDENT_BTW_SIBLINGS = 2,        /**< Indent between | and | characters. */
+    TRD_INDENT_BEFORE_KEYS = 1,         /**< "..."___\<keys\>. */
+    TRD_INDENT_BEFORE_TYPE = 4,         /**< "..."___\<type\>, but if mark is set then indent == 3. */
+    TRD_INDENT_BEFORE_IFFEATURES = 1    /**< "..."___\<iffeatures\>. */
+} trt_cnf_indent;
+
+/**
+ * @brief Type of indent in node.
+ */
+typedef enum {
+    TRD_INDENT_IN_NODE_NORMAL = 0,  /**< Node fits on one line. */
+    TRD_INDENT_IN_NODE_DIVIDED,     /**< The node must be split into multiple rows. */
+    TRD_INDENT_IN_NODE_FAILED       /**< Cannot be crammed into one line. The condition for the maximum line length is violated. */
+} trt_indent_in_node_type;
+
+/** Constant to indicate the need to break a line. */
+#define TRD_LINEBREAK -1
+
+/**
+ * @brief Records the alignment between the individual
+ * elements of the node.
+ *
+ * @see trp_default_indent_in_node, trp_try_normal_indent_in_node
+ */
+struct trt_indent_in_node {
+    trt_indent_in_node_type type;   /**< Type of indent in node. */
+    int16_t btw_name_opts;          /**< Indent between node name and \<opts\>. */
+    int16_t btw_opts_type;          /**< Indent between \<opts\> and \<type\>. */
+    int16_t btw_type_iffeatures;    /**< Indent between type and features. Ignored if \<type\> missing. */
+};
+
+/**
+ * @brief Type of wrappers to be printed.
+ */
+typedef enum {
+    TRD_WRAPPER_TOP = 0,    /**< Related to the module. */
+    TRD_WRAPPER_BODY        /**< Related to e.g. Augmentations or Groupings */
+} trd_wrapper_type;
+
+/**
+ * @brief For resolving sibling symbol ('|') placement.
+ *
+ * Bit indicates where the sibling symbol must be printed.
+ * This place is in multiples of ::TRD_INDENT_BTW_SIBLINGS.
+ *
+ * @see TRP_INIT_WRAPPER_TOP, TRP_INIT_WRAPPER_BODY,
+ * trp_wrapper_set_mark, trp_wrapper_set_shift,
+ * trp_wrapper_if_last_sibling, trp_wrapper_eq, trp_print_wrapper
+ */
+struct trt_wrapper {
+    trd_wrapper_type type;  /**< Location of the wrapper. */
+    uint64_t bit_marks1;    /**< The set bits indicate where the '|' character is to be printed.
+                                 It follows that the maximum immersion of the printable node is 64. */
+    uint32_t actual_pos;    /**< Actual position in bit_marks. */
+};
+
+/**
+ * @brief Get wrapper related to the module section.
+ *
+ * @code
+ * module: <module-name>
+ *   +--<node>
+ *   |
+ * @endcode
+ */
+#define TRP_INIT_WRAPPER_TOP \
+    (struct trt_wrapper) { \
+        .type = TRD_WRAPPER_TOP, .actual_pos = 0, .bit_marks1 = 0 \
+    }
+
+/**
+ * @brief Get wrapper related to subsection
+ * e.g. Augmenations or Groupings.
+ *
+ * @code
+ * module: <module-name>
+ *   +--<node>
+ *
+ *   augment <target-node>:
+ *     +--<node>
+ * @endcode
+ */
+#define TRP_INIT_WRAPPER_BODY \
+    (struct trt_wrapper) { \
+        .type = TRD_WRAPPER_BODY, .actual_pos = 0, .bit_marks1 = 0 \
+    }
+
+/**
+ * @brief Package which only groups wrapper and indent in node.
+ */
+struct trt_pck_indent {
+    struct trt_wrapper wrapper;         /**< Coded "  |  |  " sequence. */
+    struct trt_indent_in_node in_node;  /**< Indent in node. */
+};
+
+/**
+ * @brief Initialize struct trt_pck_indent by parameters.
+ */
+#define TRP_INIT_PCK_INDENT(WRAPPER, INDENT_IN_NODE) \
+    (struct trt_pck_indent){ \
+        .wrapper = WRAPPER, .in_node = INDENT_IN_NODE \
+    }
+
+/**********************************************************************
+ * flags
+ *********************************************************************/
+
+#define TRD_FLAGS_TYPE_EMPTY "--"
+#define TRD_FLAGS_TYPE_RW "rw"
+#define TRD_FLAGS_TYPE_RO "ro"
+#define TRD_FLAGS_TYPE_RPC_INPUT_PARAMS "-w"
+#define TRD_FLAGS_TYPE_USES_OF_GROUPING "-u"
+#define TRD_FLAGS_TYPE_RPC "-x"
+#define TRD_FLAGS_TYPE_NOTIF "-n"
+#define TRD_FLAGS_TYPE_MOUNT_POINT "mp"
+
+/**********************************************************************
+ * node_name and opts
+ *********************************************************************/
+
+#define TRD_NODE_NAME_PREFIX_CHOICE "("
+#define TRD_NODE_NAME_PREFIX_CASE ":("
+#define TRD_NODE_NAME_TRIPLE_DOT "..."
+
+/**
+ * @brief Type of the node.
+ *
+ * Used mainly to complete the correct \<opts\> next to or
+ * around the \<name\>.
+ */
+typedef enum {
+    TRD_NODE_ELSE = 0,          /**< For some node which does not require special treatment. \<name\> */
+    TRD_NODE_CASE,              /**< For case node. :(\<name\>) */
+    TRD_NODE_CHOICE,            /**< For choice node. (\<name\>) */
+    TRD_NODE_TRIPLE_DOT         /**< For collapsed sibling nodes and their children. Special case which doesn't belong here very well. */
+} trt_node_type;
+
+#define TRD_NODE_OPTIONAL "?"          /**< For an optional leaf, anydata, or anyxml. \<name\>? */
+#define TRD_NODE_CONTAINER "!"         /**< For a presence container. \<name\>! */
+#define TRD_NODE_LISTLEAFLIST "*"      /**< For a leaf-list or list. \<name\>* */
+
+/**
+ * @brief Type of node and his name.
+ *
+ * @see TRP_EMPTY_NODE_NAME, TRP_NODE_NAME_IS_EMPTY,
+ * trp_print_node_name, trp_mark_is_used, trp_print_opts_keys
+ */
+struct trt_node_name {
+    trt_node_type type;         /**< Type of the node relevant for printing. */
+    ly_bool keys;               /**< Set to 1 if [\<keys\>] are to be printed. Valid for some types only. */
+    const char *module_prefix;  /**< If the node is augmented into the tree from another module,
+                                     so this is the prefix of that module. */
+    const char *str;            /**< Name of the node. */
+    const char *add_opts;       /**< Additional opts symbol from plugin. */
+    const char *opts;           /**< The \<opts\> symbol. */
+};
+
+/**
+ * @brief Create struct trt_node_name as empty.
+ */
+#define TRP_EMPTY_NODE_NAME \
+    (struct trt_node_name) { \
+        .type = TRD_NODE_ELSE, .keys = 0, .module_prefix = NULL, .str = NULL, .opts = NULL, .add_opts = NULL \
+    }
+
+/**
+ * @brief Check if struct trt_node_name is empty.
+ */
+#define TRP_NODE_NAME_IS_EMPTY(NODE_NAME) \
+    !NODE_NAME.str
+
+/**********************************************************************
+ * type
+ *********************************************************************/
+
+/**
+ * @brief Type of the \<type\>
+ */
+typedef enum {
+    TRD_TYPE_NAME = 0,  /**< Type is just a name that does not require special treatment. */
+    TRD_TYPE_TARGET,    /**< Should have a form "-> TARGET", where TARGET is the leafref path. */
+    TRD_TYPE_LEAFREF,   /**< This type is set automatically by the 'trp' algorithm.
+                             So set type as ::TRD_TYPE_TARGET. */
+    TRD_TYPE_EMPTY      /**< Type is not used at all. */
+} trt_type_type;
+
+/**
+ * @brief \<type\> in the \<node\>.
+ *
+ * @see TRP_EMPTY_TRT_TYPE, TRP_TRT_TYPE_IS_EMPTY, trp_print_type
+ */
+struct trt_type {
+    trt_type_type type; /**< Type of the \<type\>. */
+    const char *str;    /**< Path or name of the type. */
+};
+
+/**
+ * @brief Create empty struct trt_type.
+ */
+#define TRP_EMPTY_TRT_TYPE \
+    (struct trt_type) {.type = TRD_TYPE_EMPTY, .str = NULL}
+
+/**
+ * @brief Check if struct trt_type is empty.
+ */
+#define TRP_TRT_TYPE_IS_EMPTY(TYPE_OF_TYPE) \
+    TYPE_OF_TYPE.type == TRD_TYPE_EMPTY
+
+/**
+ * @brief Initialize struct trt_type by parameters.
+ */
+#define TRP_INIT_TRT_TYPE(TYPE_OF_TYPE, STRING) \
+    (struct trt_type) {.type = TYPE_OF_TYPE, .str = STRING}
+
+/**
+ * @brief If-feature type.
+ */
+typedef enum {
+    TRD_IFF_NON_PRESENT = 0,    /**< iffeatures are not present. */
+    TRD_IFF_PRESENT,            /**< iffeatures are present and will be printed by
+                                     trt_fp_print.print_features_names callback */
+    TRD_IFF_OVERR               /**< iffeatures are override by plugin */
+} trt_iffeatures_type;
+
+/**
+ * @brief \<if-features\>.
+ */
+struct trt_iffeatures {
+    trt_iffeatures_type type;   /**< Type of iffeature. */
+    char *str;                  /**< iffeatures string ready to print. Set if TRD_IFF_OVERR is set. */
+};
+
+/**
+ * @brief Create empty iffeatures.
+ */
+#define TRP_EMPTY_TRT_IFFEATURES \
+    (struct trt_iffeatures) {.type = TRD_IFF_NON_PRESENT}
+
+/**
+ * @brief Check if iffeatures is empty.
+ *
+ * @param[in] IFF_TYPE value from trt_iffeatures.type.
+ * @return 1 if is empty.
+ */
+#define TRP_EMPTY_TRT_IFFEATURES_IS_EMPTY(IFF_TYPE) \
+    (IFF_TYPE == TRD_IFF_NON_PRESENT)
+
+/**********************************************************************
+ * node
+ *********************************************************************/
+
+/**
+ * @brief \<node\> data for printing.
+ *
+ * It contains RFC's:
+ * \<status\>--\<flags\> \<name\>\<opts\> \<type\> \<if-features\>.
+ * Item \<opts\> is moved to part struct trt_node_name.
+ * For printing [\<keys\>] and if-features is required special
+ * functions which prints them.
+ *
+ * @see TRP_EMPTY_NODE, trp_node_is_empty, trp_node_body_is_empty,
+ * trp_print_node_up_to_name, trp_print_divided_node_up_to_name,
+ * trp_print_node
+ */
+struct trt_node {
+    const char *status;                 /**< \<status\>. */
+    const char *flags;                  /**< \<flags\>. */
+    struct trt_node_name name;          /**< \<node\> with \<opts\> mark or [\<keys\>]. */
+    struct trt_type type;               /**< \<type\> contains the name of the type or type for leafref. */
+    struct trt_iffeatures iffeatures;   /**< \<if-features\>. */
+    ly_bool last_one;                   /**< Information about whether the node is the last. */
+};
+
+/**
+ * @brief Create struct trt_node as empty.
+ */
+#define TRP_EMPTY_NODE \
+    (struct trt_node) { \
+        .status = NULL, \
+        .flags = NULL, \
+        .name = TRP_EMPTY_NODE_NAME, \
+        .type = TRP_EMPTY_TRT_TYPE, \
+        .iffeatures = TRP_EMPTY_TRT_IFFEATURES, \
+        .last_one = 1 \
+    }
+
+/**
+ * @brief Package which only groups indent and node.
+ */
+struct trt_pair_indent_node {
+    struct trt_indent_in_node indent;
+    struct trt_node node;
+};
+
+/**
+ * @brief Initialize struct trt_pair_indent_node by parameters.
+ */
+#define TRP_INIT_PAIR_INDENT_NODE(INDENT_IN_NODE, NODE) \
+    (struct trt_pair_indent_node) { \
+        .indent = INDENT_IN_NODE, .node = NODE \
+    }
+
+/**********************************************************************
+ * statement
+ *********************************************************************/
+
+#define TRD_KEYWORD_MODULE "module"
+#define TRD_KEYWORD_SUBMODULE "submodule"
+#define TRD_KEYWORD_AUGMENT "augment"
+#define TRD_KEYWORD_RPC "rpcs"
+#define TRD_KEYWORD_NOTIF "notifications"
+#define TRD_KEYWORD_GROUPING "grouping"
+
+/**
+ * @brief Main sign of the tree nodes.
+ *
+ * @see TRP_EMPTY_KEYWORD_STMT, TRP_KEYWORD_STMT_IS_EMPTY
+ * trt_print_keyword_stmt_begin, trt_print_keyword_stmt_str,
+ * trt_print_keyword_stmt_end, trp_print_keyword_stmt
+ */
+struct trt_keyword_stmt {
+    const char *section_name;   /**< String containing section name. */
+    const char *argument;       /**< Name or path located begind section name. */
+    ly_bool has_node;           /**< Flag if section has any nodes. */
+};
+
+/**
+ * @brief Create struct trt_keyword_stmt as empty.
+ */
+#define TRP_EMPTY_KEYWORD_STMT \
+    (struct trt_keyword_stmt) {.section_name = NULL, .argument = NULL, .has_node = 0}
+
+/**********************************************************************
+ * Modify getters
+ *********************************************************************/
+
+struct trt_parent_cache;
+
+/**
+ * @brief Functions that change the state of the tree_ctx structure.
+ *
+ * The 'trop' or 'troc' functions are set here, which provide data
+ * for the 'trp' printing functions and are also called from the
+ * 'trb' browsing functions when walking through a tree. These callback
+ * functions need to be checked or reformulated if changes to the
+ * libyang library affect the printing tree. For all, if the value
+ * cannot be returned, its empty version obtained by relevant TRP_EMPTY
+ * macro is returned.
+ */
+struct trt_fp_modify_ctx {
+    ly_bool (*parent)(struct trt_tree_ctx *);                                           /**< Jump to parent node. Return true if parent exists. */
+    struct trt_node (*first_sibling)(struct trt_parent_cache, struct trt_tree_ctx *);   /**< Jump on the first of the siblings. */
+    struct trt_node (*next_sibling)(struct trt_parent_cache, struct trt_tree_ctx *);    /**< Jump to next sibling of the current node. */
+    struct trt_node (*next_child)(struct trt_parent_cache, struct trt_tree_ctx *);      /**< Jump to the child of the current node. */
+};
+
+/**
+ * @brief Create modify functions for compiled tree.
+ */
+#define TRP_TRT_FP_MODIFY_COMPILED \
+    (struct trt_fp_modify_ctx) { \
+        .parent = troc_modi_parent, \
+        .first_sibling = troc_modi_first_sibling, \
+        .next_sibling = troc_modi_next_sibling, \
+        .next_child = troc_modi_next_child, \
+    }
+
+/**
+ * @brief Create modify functions for parsed tree.
+ */
+#define TRP_TRT_FP_MODIFY_PARSED \
+    (struct trt_fp_modify_ctx) { \
+        .parent = trop_modi_parent, \
+        .first_sibling = trop_modi_first_sibling, \
+        .next_sibling = trop_modi_next_sibling, \
+        .next_child = trop_modi_next_child, \
+    }
+
+/**********************************************************************
+ * Read getters
+ *********************************************************************/
+
+/**
+ * @brief Functions that do not change the state of the tree_structure.
+ *
+ * For details see trt_fp_modify_ctx.
+ */
+struct trt_fp_read {
+    struct trt_keyword_stmt (*module_name)(const struct trt_tree_ctx *);            /**< Get name of the module. */
+    struct trt_node (*node)(struct trt_parent_cache, struct trt_tree_ctx *);        /**< Get current node. */
+    ly_bool (*if_sibling_exists)(const struct trt_tree_ctx *);                      /**< Check if node's sibling exists. */
+    ly_bool (*if_parent_exists)(const struct trt_tree_ctx *);                       /**< Check if node's parent exists. */
+};
+
+/**
+ * @brief Create read functions for compiled tree.
+ */
+#define TRP_TRT_FP_READ_COMPILED \
+    (struct trt_fp_read) { \
+        .module_name = tro_read_module_name, \
+        .node = troc_read_node, \
+        .if_sibling_exists = troc_read_if_sibling_exists, \
+        .if_parent_exists = tro_read_if_sibling_exists \
+    }
+
+/**
+ * @brief Create read functions for parsed tree.
+ */
+#define TRP_TRT_FP_READ_PARSED \
+    (struct trt_fp_read) { \
+        .module_name = tro_read_module_name, \
+        .node = trop_read_node, \
+        .if_sibling_exists = trop_read_if_sibling_exists, \
+        .if_parent_exists = tro_read_if_sibling_exists \
+    }
+
+/**********************************************************************
+ * All getters
+ *********************************************************************/
+
+/**
+ * @brief A set of all necessary functions that must be provided
+ * for the printer.
+ */
+struct trt_fp_all {
+    struct trt_fp_modify_ctx modify;    /**< Function pointers which modify state of trt_tree_ctx. */
+    struct trt_fp_read read;            /**< Function pointers which only reads state of trt_tree_ctx. */
+    struct trt_fp_print print;          /**< Functions pointers for printing special items in node. */
+};
+
+/**********************************************************************
+ * Printer context
+ *********************************************************************/
+
+/**
+ * @brief Main structure for @ref TRP_trp part.
+ */
+struct trt_printer_ctx {
+    struct ly_out *out;     /**< Handler to printing. */
+    struct trt_fp_all fp;   /**< @ref TRP_tro functions callbacks. */
+    size_t max_line_length; /**< The maximum number of characters that can be
+                               printed on one line, including the last. */
+};
+
+/**********************************************************************
+ * Tro functions
+ *********************************************************************/
+
+/**
+ * @brief The name of the section to which the node belongs.
+ */
+typedef enum {
+    TRD_SECT_MODULE = 0,    /**< The node belongs to the "module: <module_name>:" label. */
+    TRD_SECT_AUGMENT,       /**< The node belongs to some "augment <target-node>:" label. */
+    TRD_SECT_RPCS,          /**< The node belongs to the "rpcs:" label. */
+    TRD_SECT_NOTIF,         /**< The node belongs to the "notifications:" label. */
+    TRD_SECT_GROUPING,      /**< The node belongs to some "grouping <grouping-name>:" label. */
+    TRD_SECT_PLUG_DATA      /**< The node belongs to some plugin section. */
+} trt_actual_section;
+
+/**
+ * @brief Types of nodes that have some effect on their children.
+ */
+typedef enum {
+    TRD_ANCESTOR_ELSE = 0,      /**< Everything not listed. */
+    TRD_ANCESTOR_RPC_INPUT,     /**< ::LYS_INPUT */
+    TRD_ANCESTOR_RPC_OUTPUT,    /**< ::LYS_OUTPUT */
+    TRD_ANCESTOR_NOTIF          /**< ::LYS_NOTIF */
+} trt_ancestor_type;
+
+/**
+ * @brief Saved information when browsing the tree downwards.
+ *
+ * This structure helps prevent frequent retrieval of information
+ * from the tree. Functions @ref TRP_trb are designed to preserve
+ * this structures during their recursive calls. This functions do not
+ * interfere in any way with this data. This structure
+ * is used by @ref TRP_trop functions which, thanks to this
+ * structure, can return a node with the correct data. The word
+ * \b parent is in the structure name, because this data refers to
+ * the last parent and at the same time the states of its
+ * ancestors data. Only the function jumping on the child
+ * (next_child(...)) creates this structure, because the pointer
+ * to the current node moves down the tree. It's like passing
+ * the genetic code to children. Some data must be inherited and
+ * there are two approaches to this problem. Either it will always
+ * be determined which inheritance states belong to the current node
+ * (which can lead to regular travel to the root node) or
+ * the inheritance states will be stored during the recursive calls.
+ * So the problem was solved by the second option. Why does
+ * the structure contain this data? Because it walks through
+ * the lysp tree. For walks through the lysc tree is trt_parent_cache
+ * useless.
+ *
+ * @see TRO_EMPTY_PARENT_CACHE, tro_parent_cache_for_child
+ */
+struct trt_parent_cache {
+    trt_ancestor_type ancestor; /**< Some types of nodes have a special effect on their children. */
+    uint16_t lys_status;        /**< Inherited status CURR, DEPRC, OBSLT. */
+    uint16_t lys_config;        /**< Inherited config W or R. */
+    const struct lysp_node_list *last_list; /**< The last ::LYS_LIST passed. */
+};
+
+/**
+ * @brief Return trt_parent_cache filled with default values.
+ */
+#define TRP_EMPTY_PARENT_CACHE \
+    (struct trt_parent_cache) { \
+        .ancestor = TRD_ANCESTOR_ELSE, .lys_status = LYS_STATUS_CURR, \
+        .lys_config = LYS_CONFIG_W, .last_list = NULL \
+    }
+
+/**
+ * @brief Node override from plugin.
+ */
+struct lyplg_ext_sprinter_tree_node_override {
+    const char *flags;        /**< Override for \<flags\>. */
+    const char *add_opts;     /**< Additional symbols for \<opts\>. */
+};
+
+/**
+ * @brief Context for plugin extension.
+ */
+struct trt_plugin_ctx {
+    struct lyspr_tree_ctx *ctx;                                 /**< Pointer to main context. */
+    struct lyspr_tree_schema *schema;                           /**< Current schema to print. */
+    ly_bool filtered;                                           /**< Flag if current node is filtered. */
+    struct lyplg_ext_sprinter_tree_node_override node_overr;    /**< Current node override. */
+    ly_bool last_schema;                                        /**< Flag if schema is last. */
+    ly_bool last_error;                                         /**< Last error from plugin. */
+};
+
+/**
+ * @brief Main structure for browsing the libyang tree
+ */
+struct trt_tree_ctx {
+    ly_bool lysc_tree;                              /**< The lysc nodes are used for browsing through the tree.
+                                                         It is assumed that once set, it does not change.
+                                                         If it is true then trt_tree_ctx.pn and
+                                                         trt_tree_ctx.tpn are not used.
+                                                         If it is false then trt_tree_ctx.cn is not used. */
+    trt_actual_section section;                     /**< To which section pn points. */
+    const struct lysp_module *pmod;                 /**< Parsed YANG schema tree. */
+    const struct lysc_module *cmod;                 /**< Compiled YANG schema tree. */
+    const struct lysp_node *pn;                     /**< Actual pointer to parsed node. */
+    const struct lysp_node *tpn;                    /**< Pointer to actual top-node. */
+    const struct lysc_node *cn;                     /**< Actual pointer to compiled node. */
+    LY_ERR last_error;                              /**< Error value during printing. */
+
+    struct trt_plugin_ctx plugin_ctx;               /**< Context for plugin. */
+};
+
+/**
+ * @brief Create empty node override.
+ */
+#define TRP_TREE_CTX_EMPTY_NODE_OVERR \
+    (struct lyplg_ext_sprinter_tree_node_override) { \
+        .flags = NULL, \
+        .add_opts = NULL, \
+    }
+
+/**
+ * @brief Check if lysp node is available from
+ * the current compiled node.
+ *
+ * Use only if trt_tree_ctx.lysc_tree is set to true.
+ */
+#define TRP_TREE_CTX_LYSP_NODE_PRESENT(CN) \
+    (CN->priv)
+
+/**
+ * @brief Get lysp_node from trt_tree_ctx.cn.
+ *
+ * Use only if :TRP_TREE_CTX_LYSP_NODE_PRESENT returns true
+ * for that node.
+ */
+#define TRP_TREE_CTX_GET_LYSP_NODE(CN) \
+    ((const struct lysp_node *)CN->priv)
+
+/** Getter function for ::trop_node_charptr(). */
+typedef const char *(*trt_get_charptr_func)(const struct lysp_node *pn);
+
+/**
+ * @brief Simple getter functions for lysp and lysc nodes.
+ *
+ * This structure is useful if we have a general algorithm
+ * (tro function) that can be used for both lysc and lysp nodes.
+ * Thanks to this structure, we prevent code redundancy.
+ * We don't have to write basically the same algorithm twice
+ * for lysp and lysc trees.
+ */
+struct tro_getters {
+    uint16_t (*nodetype)(const void *);         /**< Get nodetype. */
+    const void *(*next)(const void *);          /**< Get sibling. */
+    const void *(*parent)(const void *);        /**< Get parent. */
+    const void *(*child)(const void *);         /**< Get child. */
+    const void *(*actions)(const void *);       /**< Get actions. */
+    const void *(*action_input)(const void *);  /**< Get input action from action node. */
+    const void *(*action_output)(const void *); /**< Get output action from action node. */
+    const void *(*notifs)(const void *);        /**< Get notifs. */
+};
+
+/**********************************************************************
+ * Definition of the general Trg functions
+ *********************************************************************/
+
+/**
+ * @brief Print a substring but limited to the maximum length.
+ * @param[in] str is pointer to source.
+ * @param[in] len is number of characters to be printed.
+ * @param[in,out] out is output handler.
+ * @return str parameter shifted by len.
+ */
+static const char *
+trg_print_substr(const char *str, size_t len, struct ly_out *out)
+{
+    for (size_t i = 0; i < len; i++) {
+        ly_print_(out, "%c", str[0]);
+        str++;
+    }
+    return str;
+}
+
+/**
+ * @brief Pointer is not NULL and does not point to an empty string.
+ * @param[in] str is pointer to string to be checked.
+ * @return 1 if str pointing to non empty string otherwise 0.
+ */
+static ly_bool
+trg_charptr_has_data(const char *str)
+{
+    return (str) && (str[0] != '\0');
+}
+
+/**
+ * @brief Check if @p word in @p src is present where words are
+ * delimited by @p delim.
+ * @param[in] src is source where words are separated by @p delim.
+ * @param[in] word to be searched.
+ * @param[in] delim is delimiter between @p words in @p src.
+ * @return 1 if src contains @p word otherwise 0.
+ */
+static ly_bool
+trg_word_is_present(const char *src, const char *word, char delim)
+{
+    const char *hit;
+
+    if ((!src) || (src[0] == '\0') || (!word)) {
+        return 0;
+    }
+
+    hit = strstr(src, word);
+
+    if (hit) {
+        /* word was founded at the begin of src
+         * OR it match somewhere after delim
+         */
+        if ((hit == src) || (hit[-1] == delim)) {
+            /* end of word was founded at the end of src
+             * OR end of word was match somewhere before delim
+             */
+            char delim_or_end = (hit + strlen(word))[0];
+
+            if ((delim_or_end == '\0') || (delim_or_end == delim)) {
+                return 1;
+            }
+        }
+        /* after -> hit is just substr and it's not the whole word */
+        /* jump to the next word */
+        for ( ; (src[0] != '\0') && (src[0] != delim); src++) {}
+        /* skip delim */
+        src = src[0] == '\0' ? src : src + 1;
+        /* continue with searching */
+        return trg_word_is_present(src, word, delim);
+    } else {
+        return 0;
+    }
+}
+
+/**********************************************************************
+ * Definition of printer functions
+ *********************************************************************/
+
+/**
+ * @brief Write callback for ::ly_out_new_clb().
+ *
+ * @param[in] user_data is type of struct ly_out_clb_arg.
+ * @param[in] buf contains input characters
+ * @param[in] count is number of characters in buf.
+ * @return Number of printed bytes.
+ * @return Negative value in case of error.
+ */
+static ssize_t
+trp_ly_out_clb_func(void *user_data, const void *buf, size_t count)
+{
+    LY_ERR erc = LY_SUCCESS;
+    struct ly_out_clb_arg *data = (struct ly_out_clb_arg *)user_data;
+
+    switch (data->mode) {
+    case TRD_PRINT:
+        erc = ly_write_(data->out, buf, count);
+        break;
+    case TRD_CHAR_COUNT:
+        data->counter = data->counter + count;
+        break;
+    default:
+        break;
+    }
+
+    if (erc != LY_SUCCESS) {
+        data->last_error = erc;
+        return -1;
+    } else {
+        return count;
+    }
+}
+
+/**
+ * @brief Check that indent in node can be considered as equivalent.
+ * @param[in] first is the first indent in node.
+ * @param[in] second is the second indent in node.
+ * @return 1 if indents are equivalent otherwise 0.
+ */
+static ly_bool
+trp_indent_in_node_are_eq(struct trt_indent_in_node first, struct trt_indent_in_node second)
+{
+    const ly_bool a = first.type == second.type;
+    const ly_bool b = first.btw_name_opts == second.btw_name_opts;
+    const ly_bool c = first.btw_opts_type == second.btw_opts_type;
+    const ly_bool d = first.btw_type_iffeatures == second.btw_type_iffeatures;
+
+    return a && b && c && d;
+}
+
+/**
+ * @brief Setting space character because node is last sibling.
+ * @param[in] wr is wrapper over which the shift operation
+ * is to be performed.
+ * @return New shifted wrapper.
+ */
+static struct trt_wrapper
+trp_wrapper_set_shift(struct trt_wrapper wr)
+{
+    assert(wr.actual_pos < 64);
+    /* +--<node>
+     *    +--<node>
+     */
+    wr.actual_pos++;
+    return wr;
+}
+
+/**
+ * @brief Setting '|' symbol because node is divided or
+ * it is not last sibling.
+ * @param[in] wr is source of wrapper.
+ * @return New wrapper which is marked at actual position and shifted.
+ */
+static struct trt_wrapper
+trp_wrapper_set_mark(struct trt_wrapper wr)
+{
+    assert(wr.actual_pos < 64);
+    wr.bit_marks1 |= 1U << wr.actual_pos;
+    return trp_wrapper_set_shift(wr);
+}
+
+/**
+ * @brief Setting ' ' symbol if node is last sibling otherwise set '|'.
+ * @param[in] wr is actual wrapper.
+ * @param[in] last_one is flag. Value 1 saying if the node is the last
+ * and has no more siblings.
+ * @return New wrapper for the actual node.
+ */
+static struct trt_wrapper
+trp_wrapper_if_last_sibling(struct trt_wrapper wr, ly_bool last_one)
+{
+    return last_one ? trp_wrapper_set_shift(wr) : trp_wrapper_set_mark(wr);
+}
+
+/**
+ * @brief Test if the wrappers are equivalent.
+ * @param[in] first is the first wrapper.
+ * @param[in] second is the second wrapper.
+ * @return 1 if the wrappers are equivalent otherwise 0.
+ */
+static ly_bool
+trp_wrapper_eq(struct trt_wrapper first, struct trt_wrapper second)
+{
+    const ly_bool a = first.type == second.type;
+    const ly_bool b = first.bit_marks1 == second.bit_marks1;
+    const ly_bool c = first.actual_pos == second.actual_pos;
+
+    return a && b && c;
+}
+
+/**
+ * @brief Print "  |  " sequence on line.
+ * @param[in] wr is wrapper to be printed.
+ * @param[in,out] out is output handler.
+ */
+static void
+trp_print_wrapper(struct trt_wrapper wr, struct ly_out *out)
+{
+    uint32_t lb;
+
+    if (wr.type == TRD_WRAPPER_TOP) {
+        lb = TRD_INDENT_LINE_BEGIN;
+    } else if (wr.type == TRD_WRAPPER_BODY) {
+        lb = TRD_INDENT_LINE_BEGIN * 2;
+    } else {
+        lb = TRD_INDENT_LINE_BEGIN;
+    }
+
+    ly_print_(out, "%*c", lb, ' ');
+
+    if (trp_wrapper_eq(wr, TRP_INIT_WRAPPER_TOP)) {
+        return;
+    }
+
+    for (uint32_t i = 0; i < wr.actual_pos; i++) {
+        /** Test if the bit on the index is set. */
+        if ((wr.bit_marks1 >> i) & 1U) {
+            ly_print_(out, "|");
+        } else {
+            ly_print_(out, " ");
+        }
+
+        if (i != wr.actual_pos) {
+            ly_print_(out, "%*c", TRD_INDENT_BTW_SIBLINGS, ' ');
+        }
+    }
+}
+
+/**
+ * @brief Check if struct trt_node is empty.
+ * @param[in] node is item to test.
+ * @return 1 if node is considered empty otherwise 0.
+ */
+static ly_bool
+trp_node_is_empty(const struct trt_node *node)
+{
+    const ly_bool a = TRP_EMPTY_TRT_IFFEATURES_IS_EMPTY(node->iffeatures.type);
+    const ly_bool b = TRP_TRT_TYPE_IS_EMPTY(node->type);
+    const ly_bool c = TRP_NODE_NAME_IS_EMPTY(node->name);
+    const ly_bool d = node->flags == NULL;
+    const ly_bool e = node->status == NULL;
+
+    return a && b && c && d && e;
+}
+
+/**
+ * @brief Check if [\<keys\>], \<type\> and
+ * \<iffeatures\> are empty/not_set.
+ * @param[in] node is item to test.
+ * @return 1 if node has no \<keys\> \<type\> or \<iffeatures\>
+ * otherwise 0.
+ */
+static ly_bool
+trp_node_body_is_empty(const struct trt_node *node)
+{
+    const ly_bool a = TRP_EMPTY_TRT_IFFEATURES_IS_EMPTY(node->iffeatures.type);
+    const ly_bool b = TRP_TRT_TYPE_IS_EMPTY(node->type);
+    const ly_bool c = !node->name.keys;
+
+    return a && b && c;
+}
+
+/**
+ * @brief Print entire struct trt_node_name structure.
+ * @param[in] node_name is item to print.
+ * @param[in,out] out is output handler.
+ */
+static void
+trp_print_node_name(struct trt_node_name node_name, struct ly_out *out)
+{
+    const char *mod_prefix;
+    const char *colon;
+    const char trd_node_name_suffix_choice[] = ")";
+    const char trd_node_name_suffix_case[] = ")";
+
+    if (TRP_NODE_NAME_IS_EMPTY(node_name)) {
+        return;
+    }
+
+    if (node_name.module_prefix) {
+        mod_prefix = node_name.module_prefix;
+        colon = ":";
+    } else {
+        mod_prefix = "";
+        colon = "";
+    }
+
+    switch (node_name.type) {
+    case TRD_NODE_ELSE:
+        ly_print_(out, "%s%s%s", mod_prefix, colon, node_name.str);
+        break;
+    case TRD_NODE_CASE:
+        ly_print_(out, "%s%s%s%s%s", TRD_NODE_NAME_PREFIX_CASE, mod_prefix, colon, node_name.str, trd_node_name_suffix_case);
+        break;
+    case TRD_NODE_CHOICE:
+        ly_print_(out, "%s%s%s%s%s", TRD_NODE_NAME_PREFIX_CHOICE,  mod_prefix, colon, node_name.str, trd_node_name_suffix_choice);
+        break;
+    case TRD_NODE_TRIPLE_DOT:
+        ly_print_(out, "%s", TRD_NODE_NAME_TRIPLE_DOT);
+        break;
+    default:
+        break;
+    }
+
+    if (node_name.add_opts) {
+        ly_print_(out, "%s", node_name.add_opts);
+    }
+    if (node_name.opts) {
+        ly_print_(out, "%s", node_name.opts);
+    }
+}
+
+/**
+ * @brief Check if mark (?, !, *, /, @) is implicitly contained in
+ * struct trt_node_name.
+ * @param[in] node_name is structure containing the 'mark'.
+ * @return 1 if contain otherwise 0.
+ */
+static ly_bool
+trp_mark_is_used(struct trt_node_name node_name)
+{
+    if (TRP_NODE_NAME_IS_EMPTY(node_name)) {
+        return 0;
+    } else if (node_name.keys) {
+        return 0;
+    }
+
+    switch (node_name.type) {
+    case TRD_NODE_ELSE:
+    case TRD_NODE_CASE:
+        return 0;
+    default:
+        if (node_name.add_opts || node_name.opts) {
+            return 1;
+        } else {
+            return 0;
+        }
+    }
+}
+
+/**
+ * @brief Print opts keys.
+ * @param[in] node_name contains type of the node with his name.
+ * @param[in] btw_name_opts is number of spaces between name and [keys].
+ * @param[in] cf is basically a pointer to the function that prints
+ * the keys.
+ * @param[in,out] out is output handler.
+ */
+static void
+trp_print_opts_keys(struct trt_node_name node_name, int16_t btw_name_opts, struct trt_cf_print cf, struct ly_out *out)
+{
+    if (!node_name.keys) {
+        return;
+    }
+
+    /* <name><mark>___<keys>*/
+    if (btw_name_opts > 0) {
+        ly_print_(out, "%*c", btw_name_opts, ' ');
+    }
+    ly_print_(out, "[");
+    cf.pf(cf.ctx, out);
+    ly_print_(out, "]");
+}
+
+/**
+ * @brief Print entire struct trt_type structure.
+ * @param[in] type is item to print.
+ * @param[in,out] out is output handler.
+ */
+static void
+trp_print_type(struct trt_type type, struct ly_out *out)
+{
+    if (TRP_TRT_TYPE_IS_EMPTY(type)) {
+        return;
+    }
+
+    switch (type.type) {
+    case TRD_TYPE_NAME:
+        ly_print_(out, "%s", type.str);
+        break;
+    case TRD_TYPE_TARGET:
+        ly_print_(out, "-> %s", type.str);
+        break;
+    case TRD_TYPE_LEAFREF:
+        ly_print_(out, "leafref");
+    default:
+        break;
+    }
+}
+
+/**
+ * @brief Print all iffeatures of node
+ *
+ * @param[in] iff is iffeatures to print.
+ * @param[in] cf is basically a pointer to the function that prints the list of features.
+ * @param[in,out] out is output handler.
+ */
+static void
+trp_print_iffeatures(struct trt_iffeatures iff, struct trt_cf_print cf, struct ly_out *out)
+{
+    if (iff.type == TRD_IFF_PRESENT) {
+        ly_print_(out, "{");
+        cf.pf(cf.ctx, out);
+        ly_print_(out, "}?");
+    } else if (iff.type == TRD_IFF_OVERR) {
+        ly_print_(out, "%s", iff.str);
+    }
+}
+
+/**
+ * @brief Print just \<status\>--\<flags\> \<name\> with opts mark.
+ * @param[in] node contains items to print.
+ * @param[in] out is output handler.
+ */
+static void
+trp_print_node_up_to_name(const struct trt_node *node, struct ly_out *out)
+{
+    if (node->name.type == TRD_NODE_TRIPLE_DOT) {
+        trp_print_node_name(node->name, out);
+        return;
+    }
+    /* <status>--<flags> */
+    ly_print_(out, "%s", node->status);
+    ly_print_(out, "--");
+    /* If the node is a case node, there is no space before the <name>
+     * also case node has no flags.
+     */
+    if (node->flags && (node->name.type != TRD_NODE_CASE)) {
+        ly_print_(out, "%s", node->flags);
+        ly_print_(out, " ");
+    }
+    /* <name> */
+    trp_print_node_name(node->name, out);
+}
+
+/**
+ * @brief Print alignment (spaces) instead of
+ * \<status\>--\<flags\> \<name\> for divided node.
+ * @param[in] node contains items to print.
+ * @param[in] out is output handler.
+ */
+static void
+trp_print_divided_node_up_to_name(const struct trt_node *node, struct ly_out *out)
+{
+    uint32_t space = strlen(node->flags);
+
+    if (node->name.type == TRD_NODE_CASE) {
+        /* :(<name> */
+        space += strlen(TRD_NODE_NAME_PREFIX_CASE);
+    } else if (node->name.type == TRD_NODE_CHOICE) {
+        /* (<name> */
+        space += strlen(TRD_NODE_NAME_PREFIX_CHOICE);
+    } else {
+        /* _<name> */
+        space += strlen(" ");
+    }
+
+    /* <name>
+     * __
+     */
+    space += TRD_INDENT_LONG_LINE_BREAK;
+
+    ly_print_(out, "%*c", space, ' ');
+}
+
+/**
+ * @brief Print struct trt_node structure.
+ * @param[in] node is item to print.
+ * @param[in] pck package of functions for
+ * printing [\<keys\>] and \<iffeatures\>.
+ * @param[in] indent is the indent in node.
+ * @param[in,out] out is output handler.
+ */
+static void
+trp_print_node(const struct trt_node *node, struct trt_pck_print pck, struct trt_indent_in_node indent, struct ly_out *out)
+{
+    ly_bool triple_dot;
+    ly_bool divided;
+    struct trt_cf_print cf_print_keys;
+    struct trt_cf_print cf_print_iffeatures;
+
+    if (trp_node_is_empty(node)) {
+        return;
+    }
+
+    /* <status>--<flags> <name><opts> <type> <if-features> */
+    triple_dot = node->name.type == TRD_NODE_TRIPLE_DOT;
+    divided = indent.type == TRD_INDENT_IN_NODE_DIVIDED;
+
+    if (triple_dot) {
+        trp_print_node_name(node->name, out);
+        return;
+    } else if (!divided) {
+        trp_print_node_up_to_name(node, out);
+    } else {
+        trp_print_divided_node_up_to_name(node, out);
+    }
+
+    /* <opts> */
+    /* <name>___<opts>*/
+    cf_print_keys.ctx = pck.tree_ctx;
+    cf_print_keys.pf = pck.fps.print_keys;
+
+    trp_print_opts_keys(node->name, indent.btw_name_opts, cf_print_keys, out);
+
+    /* <opts>__<type> */
+    if (indent.btw_opts_type > 0) {
+        ly_print_(out, "%*c", indent.btw_opts_type, ' ');
+    }
+
+    /* <type> */
+    trp_print_type(node->type, out);
+
+    /* <type>__<iffeatures> */
+    if (indent.btw_type_iffeatures > 0) {
+        ly_print_(out, "%*c", indent.btw_type_iffeatures, ' ');
+    }
+
+    /* <iffeatures> */
+    cf_print_iffeatures.ctx = pck.tree_ctx;
+    cf_print_iffeatures.pf = pck.fps.print_features_names;
+
+    trp_print_iffeatures(node->iffeatures, cf_print_iffeatures, out);
+}
+
+/**
+ * @brief Print keyword based on trt_keyword_stmt.type.
+ * @param[in] ks is keyword statement to print.
+ * @param[in,out] out is output handler
+ */
+static void
+trt_print_keyword_stmt_begin(struct trt_keyword_stmt ks, struct ly_out *out)
+{
+    if (!strcmp(ks.section_name, TRD_KEYWORD_MODULE) ||
+            !strcmp(ks.section_name, TRD_KEYWORD_SUBMODULE)) {
+        ly_print_(out, "%s: ", ks.section_name);
+        return;
+    }
+
+    ly_print_(out, "%*c", TRD_INDENT_LINE_BEGIN, ' ');
+    if (ks.argument) {
+        ly_print_(out, "%s ", ks.section_name);
+    } else {
+        ly_print_(out, "%s", ks.section_name);
+    }
+}
+
+/**
+ * @brief Print trt_keyword_stmt.str which is string of name or path.
+ * @param[in] ks is keyword statement structure.
+ * @param[in] mll is max line length.
+ * @param[in,out] out is output handler.
+ */
+static void
+trt_print_keyword_stmt_str(struct trt_keyword_stmt ks, size_t mll, struct ly_out *out)
+{
+    uint32_t ind_initial;
+    uint32_t ind_divided;
+    /* flag if path must be splitted to more lines */
+    ly_bool linebreak_was_set;
+    /* flag if at least one subpath was printed */
+    ly_bool subpath_printed;
+    /* the sum of the sizes of the substrings on the current line */
+    uint32_t how_far;
+    /* pointer to start of the subpath */
+    const char *sub_ptr;
+    /* size of subpath from sub_ptr */
+    size_t sub_len;
+
+    if ((!ks.argument) || (ks.argument[0] == '\0')) {
+        return;
+    }
+
+    /* module name cannot be splitted */
+    if (!strcmp(ks.section_name, TRD_KEYWORD_MODULE) || !strcmp(ks.section_name, TRD_KEYWORD_SUBMODULE)) {
+        ly_print_(out, "%s", ks.argument);
+        return;
+    }
+
+    /* after -> for trd_keyword_stmt_body do */
+
+    /* set begin indentation */
+    ind_initial = TRD_INDENT_LINE_BEGIN + strlen(ks.section_name) + 1;
+    ind_divided = ind_initial + TRD_INDENT_LONG_LINE_BREAK;
+    linebreak_was_set = 0;
+    subpath_printed = 0;
+    how_far = 0;
+    sub_ptr = ks.argument;
+    sub_len = 0;
+
+    while (sub_ptr[0] != '\0') {
+        uint32_t ind;
+        /* skip slash */
+        const char *tmp = sub_ptr[0] == '/' ? sub_ptr + 1 : sub_ptr;
+
+        /* get position of the end of substr */
+        tmp = strchr(tmp, '/');
+        /* set correct size if this is a last substring */
+        sub_len = !tmp ? strlen(sub_ptr) : (size_t)(tmp - sub_ptr);
+        /* actualize sum of the substring's sizes on the current line */
+        how_far += sub_len;
+        /* correction due to colon character if it this is last substring */
+        how_far = *(sub_ptr + sub_len) == '\0' ? how_far + 1 : how_far;
+        /* choose indentation which depends on
+         * whether the string is printed on multiple lines or not
+         */
+        ind = linebreak_was_set ? ind_divided : ind_initial;
+        if (ind + how_far <= mll) {
+            /* printing before max line length */
+            sub_ptr = trg_print_substr(sub_ptr, sub_len, out);
+            subpath_printed = 1;
+        } else {
+            /* printing on new line */
+            if (subpath_printed == 0) {
+                /* first subpath is too long
+                 * but print it at first line anyway
+                 */
+                sub_ptr = trg_print_substr(sub_ptr, sub_len, out);
+                subpath_printed = 1;
+                continue;
+            }
+            ly_print_(out, "\n");
+            ly_print_(out, "%*c", ind_divided, ' ');
+            linebreak_was_set = 1;
+            sub_ptr = trg_print_substr(sub_ptr, sub_len, out);
+            how_far = sub_len;
+            subpath_printed = 1;
+        }
+    }
+}
+
+/**
+ * @brief Print separator based on trt_keyword_stmt.type
+ * @param[in] ks is keyword statement structure.
+ * @param[in,out] out is output handler.
+ */
+static void
+trt_print_keyword_stmt_end(struct trt_keyword_stmt ks, struct ly_out *out)
+{
+    if (!strcmp(ks.section_name, TRD_KEYWORD_MODULE) || !strcmp(ks.section_name, TRD_KEYWORD_SUBMODULE)) {
+        return;
+    } else if (ks.has_node) {
+        ly_print_(out, ":");
+    }
+}
+
+/**
+ * @brief Print entire struct trt_keyword_stmt structure.
+ * @param[in] ks is item to print.
+ * @param[in] mll is max line length.
+ * @param[in,out] out is output handler.
+ */
+static void
+trp_print_keyword_stmt(struct trt_keyword_stmt ks, size_t mll, struct ly_out *out)
+{
+    assert(ks.section_name);
+    trt_print_keyword_stmt_begin(ks, out);
+    trt_print_keyword_stmt_str(ks, mll, out);
+    trt_print_keyword_stmt_end(ks, out);
+}
+
+/**********************************************************************
+ * Main trp functions
+ *********************************************************************/
+
+/**
+ * @brief Printing one line including wrapper and node
+ * which can be incomplete (divided).
+ * @param[in] node is \<node\> representation.
+ * @param[in] pck contains special printing functions callback.
+ * @param[in] indent contains wrapper and indent in node numbers.
+ * @param[in,out] out is output handler.
+ */
+static void
+trp_print_line(const struct trt_node *node, struct trt_pck_print pck, struct trt_pck_indent indent, struct ly_out *out)
+{
+    trp_print_wrapper(indent.wrapper, out);
+    trp_print_node(node, pck, indent.in_node, out);
+}
+
+/**
+ * @brief Printing one line including wrapper and
+ * \<status\>--\<flags\> \<name\>\<option_mark\>.
+ * @param[in] node is \<node\> representation.
+ * @param[in] wr is wrapper for printing indentation before node.
+ * @param[in] out is output handler.
+ */
+static void
+trp_print_line_up_to_node_name(const struct trt_node *node, struct trt_wrapper wr, struct ly_out *out)
+{
+    trp_print_wrapper(wr, out);
+    trp_print_node_up_to_name(node, out);
+}
+
+/**
+ * @brief Check if leafref target must be change to string 'leafref'
+ * because his target string is too long.
+ * @param[in] node containing leafref target.
+ * @param[in] wr is wrapper for printing indentation before node.
+ * @param[in] mll is max line length.
+ * @param[in] out is output handler.
+ * @return true if leafref must be changed to string 'leafref'.
+ */
+static ly_bool
+trp_leafref_target_is_too_long(const struct trt_node *node, struct trt_wrapper wr, size_t mll, struct ly_out *out)
+{
+    size_t type_len;
+    struct ly_out_clb_arg *data;
+
+    if (node->type.type != TRD_TYPE_TARGET) {
+        return 0;
+    }
+
+    /* set ly_out to counting characters */
+    data = out->method.clb.arg;
+
+    data->counter = 0;
+    data->mode = TRD_CHAR_COUNT;
+    /* count number of printed bytes */
+    trp_print_wrapper(wr, out);
+    ly_print_(out, "%*c", TRD_INDENT_BTW_SIBLINGS, ' ');
+    trp_print_divided_node_up_to_name(node, out);
+    data->mode = TRD_PRINT;
+    type_len = strlen(node->type.str);
+
+    return data->counter + type_len > mll;
+}
+
+/**
+ * @brief Get default indent in node based on node values.
+ * @param[in] node is \<node\> representation.
+ * @return Default indent in node assuming that the node
+ * will not be divided.
+ */
+static struct trt_indent_in_node
+trp_default_indent_in_node(const struct trt_node *node)
+{
+    struct trt_indent_in_node ret;
+    uint32_t opts_len = 0;
+
+    ret.type = TRD_INDENT_IN_NODE_NORMAL;
+
+    /* btw_name_opts */
+    ret.btw_name_opts = node->name.keys ? TRD_INDENT_BEFORE_KEYS : 0;
+
+    /* btw_opts_type */
+    if (!(TRP_TRT_TYPE_IS_EMPTY(node->type))) {
+        if (trp_mark_is_used(node->name)) {
+            opts_len += node->name.add_opts ? strlen(node->name.add_opts) : 0;
+            opts_len += node->name.opts ? strlen(node->name.opts) : 0;
+            ret.btw_opts_type = TRD_INDENT_BEFORE_TYPE > opts_len ? 1 : TRD_INDENT_BEFORE_TYPE - opts_len;
+        } else {
+            ret.btw_opts_type = TRD_INDENT_BEFORE_TYPE;
+        }
+    } else {
+        ret.btw_opts_type = 0;
+    }
+
+    /* btw_type_iffeatures */
+    ret.btw_type_iffeatures = node->iffeatures.type == TRD_IFF_PRESENT ? TRD_INDENT_BEFORE_IFFEATURES : 0;
+
+    return ret;
+}
+
+/**
+ * @brief Setting linebreaks in trt_indent_in_node.
+ *
+ * The order where the linebreak tag can be placed is from the end.
+ *
+ * @param[in] indent containing alignment lengths
+ * or already linebreak marks.
+ * @return indent with a newly placed linebreak tag.
+ * @return .type set to TRD_INDENT_IN_NODE_FAILED if it is not possible
+ * to place a more linebreaks.
+ */
+static struct trt_indent_in_node
+trp_indent_in_node_place_break(struct trt_indent_in_node indent)
+{
+    /* somewhere must be set a line break in node */
+    struct trt_indent_in_node ret = indent;
+
+    /* gradually break the node from the end */
+    if ((indent.btw_type_iffeatures != TRD_LINEBREAK) && (indent.btw_type_iffeatures != 0)) {
+        ret.btw_type_iffeatures = TRD_LINEBREAK;
+    } else if ((indent.btw_opts_type != TRD_LINEBREAK) && (indent.btw_opts_type != 0)) {
+        ret.btw_opts_type = TRD_LINEBREAK;
+    } else if ((indent.btw_name_opts != TRD_LINEBREAK) && (indent.btw_name_opts != 0)) {
+        /* set line break between name and opts */
+        ret.btw_name_opts = TRD_LINEBREAK;
+    } else {
+        /* it is not possible to place a more line breaks,
+         * unfortunately the max_line_length constraint is violated
+         */
+        ret.type = TRD_INDENT_IN_NODE_FAILED;
+    }
+    return ret;
+}
+
+/**
+ * @brief Set the first half of the node based on the linebreak mark.
+ *
+ * Items in the second half of the node will be empty.
+ *
+ * @param[in,out] innod contains information in which part of the \<node\>
+ * the first half ends. Set first half of the node, indent is unchanged.
+ */
+static void
+trp_first_half_node(struct trt_pair_indent_node *innod)
+{
+    if (innod->indent.btw_name_opts == TRD_LINEBREAK) {
+        innod->node.type = TRP_EMPTY_TRT_TYPE;
+        innod->node.iffeatures = TRP_EMPTY_TRT_IFFEATURES;
+    } else if (innod->indent.btw_opts_type == TRD_LINEBREAK) {
+        innod->node.type = TRP_EMPTY_TRT_TYPE;
+        innod->node.iffeatures = TRP_EMPTY_TRT_IFFEATURES;
+    } else if (innod->indent.btw_type_iffeatures == TRD_LINEBREAK) {
+        innod->node.iffeatures = TRP_EMPTY_TRT_IFFEATURES;
+    }
+}
+
+/**
+ * @brief Set the second half of the node based on the linebreak mark.
+ *
+ * Items in the first half of the node will be empty.
+ * Indentations belonging to the first node will be reset to zero.
+ *
+ * @param[in,out] innod contains information in which part of the \<node\>
+ * the second half starts. Set second half of the node, indent is newly set.
+ */
+static void
+trp_second_half_node(struct trt_pair_indent_node *innod)
+{
+    if (innod->indent.btw_name_opts < 0) {
+        /* Logically, the information up to token <opts> should
+         * be deleted, but the the trp_print_node function needs it to
+         * create the correct indent.
+         */
+        innod->indent.btw_name_opts = 0;
+        innod->indent.btw_opts_type = TRP_TRT_TYPE_IS_EMPTY(innod->node.type) ? 0 : TRD_INDENT_BEFORE_TYPE;
+        innod->indent.btw_type_iffeatures = innod->node.iffeatures.type == TRD_IFF_NON_PRESENT ? 0 : TRD_INDENT_BEFORE_IFFEATURES;
+    } else if (innod->indent.btw_opts_type == TRD_LINEBREAK) {
+        innod->indent.btw_name_opts = 0;
+        innod->indent.btw_opts_type = 0;
+        innod->indent.btw_type_iffeatures = innod->node.iffeatures.type == TRD_IFF_NON_PRESENT ? 0 : TRD_INDENT_BEFORE_IFFEATURES;
+    } else if (innod->indent.btw_type_iffeatures == TRD_LINEBREAK) {
+        innod->node.type = TRP_EMPTY_TRT_TYPE;
+        innod->indent.btw_name_opts = 0;
+        innod->indent.btw_opts_type = 0;
+        innod->indent.btw_type_iffeatures = 0;
+    }
+}
+
+/**
+ * @brief Get the correct alignment for the node.
+ *
+ * This function is recursively called itself. It's like a backend
+ * function for a function ::trp_try_normal_indent_in_node().
+ *
+ * @param[in] pck contains speciall callback functions for printing.
+ * @param[in] wrapper contains information about '|' context.
+ * @param[in] mll is max line length.
+ * @param[in,out] cnt counting number of characters to print.
+ * @param[in,out] out is output handler.
+ * @param[in,out] innod pair of node and indentation numbers of that node.
+ */
+static void
+trp_try_normal_indent_in_node_(struct trt_pck_print pck, struct trt_wrapper wrapper, size_t mll, size_t *cnt,
+        struct ly_out *out, struct trt_pair_indent_node *innod)
+{
+    trp_print_line(&innod->node, pck, TRP_INIT_PCK_INDENT(wrapper, innod->indent), out);
+
+    if (*cnt <= mll) {
+        /* success */
+        return;
+    } else {
+        innod->indent = trp_indent_in_node_place_break(innod->indent);
+        if (innod->indent.type != TRD_INDENT_IN_NODE_FAILED) {
+            /* erase information in node due to line break */
+            trp_first_half_node(innod);
+            /* check if line fits, recursive call */
+            *cnt = 0;
+            trp_try_normal_indent_in_node_(pck, wrapper, mll, cnt, out, innod);
+            /* make sure that the result will be with the status divided
+             * or eventually with status failed */
+            innod->indent.type = innod->indent.type == TRD_INDENT_IN_NODE_FAILED ? TRD_INDENT_IN_NODE_FAILED : TRD_INDENT_IN_NODE_DIVIDED;
+        }
+        return;
+    }
+}
+
+/**
+ * @brief Get the correct alignment for the node.
+ *
+ * @param[in] node is \<node\> representation.
+ * @param[in] pck contains speciall callback functions for printing.
+ * @param[in] indent contains wrapper and indent in node numbers.
+ * @param[in] mll is max line length.
+ * @param[in,out] out is output handler.
+ * @param[out] innod If the node does not fit in the line, some indent variable has negative value as a line break sign
+ * and therefore ::TRD_INDENT_IN_NODE_DIVIDED is set.
+ * If the node fits into the line, all indent variables values has non-negative number and therefore
+ * ::TRD_INDENT_IN_NODE_NORMAL is set.
+ * If the node does not fit into the line, all indent variables has negative or zero values, function failed
+ * and therefore ::TRD_INDENT_IN_NODE_FAILED is set.
+ */
+static void
+trp_try_normal_indent_in_node(const struct trt_node *node, struct trt_pck_print pck, struct trt_pck_indent indent,
+        size_t mll, struct ly_out *out, struct trt_pair_indent_node *innod)
+{
+    struct ly_out_clb_arg *data;
+
+    *innod = TRP_INIT_PAIR_INDENT_NODE(indent.in_node, *node);
+
+    /* set ly_out to counting characters */
+    data = out->method.clb.arg;
+
+    data->counter = 0;
+    data->mode = TRD_CHAR_COUNT;
+    trp_try_normal_indent_in_node_(pck, indent.wrapper, mll, &data->counter, out, innod);
+    data->mode = TRD_PRINT;
+}
+
+/**
+ * @brief Auxiliary function for ::trp_print_entire_node()
+ * that prints split nodes.
+ * @param[in] node is node representation.
+ * @param[in] ppck contains speciall callback functions for printing.
+ * @param[in] ipck contains wrapper and indent in node numbers.
+ * @param[in] mll is max line length.
+ * @param[in,out] out is output handler.
+ */
+static void
+trp_print_divided_node(const struct trt_node *node, struct trt_pck_print ppck, struct trt_pck_indent ipck, size_t mll, struct ly_out *out)
+{
+    ly_bool entire_node_was_printed;
+    struct trt_pair_indent_node innod;
+
+    trp_try_normal_indent_in_node(node, ppck, ipck, mll, out, &innod);
+
+    if (innod.indent.type == TRD_INDENT_IN_NODE_FAILED) {
+        /* nothing can be done, continue as usual */
+        innod.indent.type = TRD_INDENT_IN_NODE_DIVIDED;
+    }
+
+    trp_print_line(&innod.node, ppck, TRP_INIT_PCK_INDENT(ipck.wrapper, innod.indent), out);
+    entire_node_was_printed = trp_indent_in_node_are_eq(ipck.in_node, innod.indent);
+
+    if (!entire_node_was_printed) {
+        ly_print_(out, "\n");
+        /* continue with second half node */
+        innod.node = *node;
+        trp_second_half_node(&innod);
+        /* continue with printing node */
+        trp_print_divided_node(&innod.node, ppck, TRP_INIT_PCK_INDENT(ipck.wrapper, innod.indent), mll, out);
+    } else {
+        return;
+    }
+}
+
+/**
+ * @brief Printing of the wrapper and the whole node,
+ * which can be divided into several lines.
+ * @param[in] node_p is node representation.
+ * @param[in] ppck contains speciall callback functions for printing.
+ * @param[in] ipck contains wrapper and indent in node numbers.
+ * @param[in] mll is max line length.
+ * @param[in,out] out is output handler.
+ */
+static void
+trp_print_entire_node(const struct trt_node *node_p, struct trt_pck_print ppck, struct trt_pck_indent ipck, size_t mll,
+        struct ly_out *out)
+{
+    struct trt_pair_indent_node innod;
+    struct trt_pck_indent tmp;
+    struct trt_node node;
+
+    node = *node_p;
+    if (trp_leafref_target_is_too_long(&node, ipck.wrapper, mll, out)) {
+        node.type.type = TRD_TYPE_LEAFREF;
+    }
+
+    /* check if normal indent is possible */
+    trp_try_normal_indent_in_node(&node, ppck, ipck, mll, out, &innod);
+
+    if (innod.indent.type == TRD_INDENT_IN_NODE_NORMAL) {
+        /* node fits to one line */
+        trp_print_line(&node, ppck, ipck, out);
+    } else if (innod.indent.type == TRD_INDENT_IN_NODE_DIVIDED) {
+        /* node will be divided */
+        /* print first half */
+        tmp = TRP_INIT_PCK_INDENT(ipck.wrapper, innod.indent);
+        /* pretend that this is normal node */
+        tmp.in_node.type = TRD_INDENT_IN_NODE_NORMAL;
+
+        trp_print_line(&innod.node, ppck, tmp, out);
+        ly_print_(out, "\n");
+
+        /* continue with second half on new line */
+        innod.node = node;
+        trp_second_half_node(&innod);
+        tmp = TRP_INIT_PCK_INDENT(trp_wrapper_if_last_sibling(ipck.wrapper, node.last_one), innod.indent);
+
+        trp_print_divided_node(&innod.node, ppck, tmp, mll, out);
+    } else if (innod.indent.type == TRD_INDENT_IN_NODE_FAILED) {
+        /* node name is too long */
+        trp_print_line_up_to_node_name(&node, ipck.wrapper, out);
+
+        if (trp_node_body_is_empty(&node)) {
+            return;
+        } else {
+            ly_print_(out, "\n");
+
+            innod.node = node;
+            trp_second_half_node(&innod);
+            innod.indent.type = TRD_INDENT_IN_NODE_DIVIDED;
+            tmp = TRP_INIT_PCK_INDENT(trp_wrapper_if_last_sibling(ipck.wrapper, node.last_one), innod.indent);
+
+            trp_print_divided_node(&innod.node, ppck, tmp, mll, out);
+        }
+    }
+}
+
+/**
+ * @brief Check if parent-stmt is valid for printing extensinon.
+ *
+ * @param[in] lysc_tree flag if ext is from compiled tree.
+ * @param[in] ext Extension to check.
+ * @return 1 if extension is valid.
+ */
+static ly_bool
+trp_ext_parent_is_valid(ly_bool lysc_tree, void *ext)
+{
+    enum ly_stmt parent_stmt;
+
+    if (lysc_tree) {
+        parent_stmt = ((struct lysc_ext_instance *)ext)->parent_stmt;
+    } else {
+        parent_stmt = ((struct lysp_ext_instance *)ext)->parent_stmt;
+    }
+    if ((parent_stmt & LY_STMT_OP_MASK) || (parent_stmt & LY_STMT_DATA_NODE_MASK) ||
+            (parent_stmt & LY_STMT_SUBMODULE) || parent_stmt & LY_STMT_MODULE) {
+        return 1;
+    } else {
+        return 0;
+    }
+}
+
+/**
+ * @brief Check if printer_tree can use node extension.
+ *
+ * @param[in] lysc_tree Flag if @p node is compiled.
+ * @param[in] node to check. Its type is lysc_node or lysp_node.
+ * @return Pointer to extension instance which printer_tree can used.
+ */
+static void *
+trp_ext_is_present(ly_bool lysc_tree, const void *node)
+{
+    const struct lysp_node *pn;
+    const struct lysc_node *cn;
+    LY_ARRAY_COUNT_TYPE i;
+    void *ret = NULL;
+
+    if (!node) {
+        return NULL;
+    }
+
+    if (lysc_tree) {
+        cn = (const struct lysc_node *)node;
+        LY_ARRAY_FOR(cn->exts, i) {
+            if (!(cn->exts && cn->exts->def->plugin && cn->exts->def->plugin->printer_ctree)) {
+                continue;
+            }
+            if (!trp_ext_parent_is_valid(1, &cn->exts[i])) {
+                continue;
+            }
+            ret = &cn->exts[i];
+            break;
+        }
+    } else {
+        pn = (const struct lysp_node *)node;
+        LY_ARRAY_FOR(pn->exts, i) {
+            if (!(pn->exts && pn->exts->record->plugin.printer_ptree)) {
+                continue;
+            }
+            if (!trp_ext_parent_is_valid(0, &pn->exts[i])) {
+                continue;
+            }
+            ret = &pn->exts[i];
+            break;
+        }
+    }
+
+    return ret;
+}
+
+/**
+ * @brief Check if printer_tree can use node extension.
+ *
+ * @param[in] tc Context with current node.
+ * @return 1 if some extension for printer_tree is valid.
+ */
+static ly_bool
+trp_ext_is_present_in_node(struct trt_tree_ctx *tc)
+{
+    if (tc->lysc_tree && trp_ext_is_present(tc->lysc_tree, tc->cn)) {
+        return 1;
+    } else if (trp_ext_is_present(tc->lysc_tree, tc->pn)) {
+        return 1;
+    }
+
+    return 0;
+}
+
+/**
+ * @brief Release allocated memory and set pointers to NULL.
+ *
+ * @param[in,out] overr is override structure to release.
+ * @param[out] filtered is flag to reset.
+ */
+static void
+trp_ext_free_node_override(struct lyplg_ext_sprinter_tree_node_override *overr, ly_bool *filtered)
+{
+    *filtered = 0;
+    overr->flags = NULL;
+    overr->add_opts = NULL;
+}
+
+/**
+ * @brief Release private plugin data.
+ *
+ * @param[in,out] plug_ctx is plugin context.
+ */
+static void
+trp_ext_free_plugin_ctx(struct lyspr_tree_ctx *plug_ctx)
+{
+    LY_ARRAY_FREE(plug_ctx->schemas);
+    if (plug_ctx->free_plugin_priv) {
+        plug_ctx->free_plugin_priv(plug_ctx->plugin_priv);
+    }
+}
+
+/**********************************************************************
+ * trop and troc getters
+ *********************************************************************/
+
+/**
+ * @brief Get nodetype.
+ * @param[in] node is any lysp_node.
+ */
+static uint16_t
+trop_nodetype(const void *node)
+{
+    return ((const struct lysp_node *)node)->nodetype;
+}
+
+/**
+ * @brief Get sibling.
+ * @param[in] node is any lysp_node.
+ */
+static const void *
+trop_next(const void *node)
+{
+    return ((const struct lysp_node *)node)->next;
+}
+
+/**
+ * @brief Get parent.
+ * @param[in] node is any lysp_node.
+ */
+static const void *
+trop_parent(const void *node)
+{
+    return ((const struct lysp_node *)node)->parent;
+}
+
+/**
+ * @brief Try to get child.
+ * @param[in] node is any lysp_node.
+ */
+static const void *
+trop_child(const void *node)
+{
+    return lysp_node_child(node);
+}
+
+/**
+ * @brief Try to get action.
+ * @param[in] node is any lysp_node.
+ */
+static const void *
+trop_actions(const void *node)
+{
+    return lysp_node_actions(node);
+}
+
+/**
+ * @brief Try to get action.
+ * @param[in] node must be of type lysp_node_action.
+ */
+static const void *
+trop_action_input(const void *node)
+{
+    return &((const struct lysp_node_action *)node)->input;
+}
+
+/**
+ * @brief Try to get action.
+ * @param[in] node must be of type lysp_node_action.
+ */
+static const void *
+trop_action_output(const void *node)
+{
+    return &((const struct lysp_node_action *)node)->output;
+}
+
+/**
+ * @brief Try to get action.
+ * @param[in] node is any lysp_node.
+ */
+static const void *
+trop_notifs(const void *node)
+{
+    return lysp_node_notifs(node);
+}
+
+/**
+ * @brief Fill struct tro_getters with @ref TRP_trop getters
+ * which are adapted to lysp nodes.
+ */
+static struct tro_getters
+trop_init_getters(void)
+{
+    return (struct tro_getters) {
+               .nodetype = trop_nodetype,
+               .next = trop_next,
+               .parent = trop_parent,
+               .child = trop_child,
+               .actions = trop_actions,
+               .action_input = trop_action_input,
+               .action_output = trop_action_output,
+               .notifs = trop_notifs
+    };
+}
+
+/**
+ * @brief Get nodetype.
+ * @param[in] node is any lysc_node.
+ */
+static uint16_t
+troc_nodetype(const void *node)
+{
+    return ((const struct lysc_node *)node)->nodetype;
+}
+
+/**
+ * @brief Get sibling.
+ * @param[in] node is any lysc_node.
+ */
+static const void *
+troc_next(const void *node)
+{
+    return ((const struct lysc_node *)node)->next;
+}
+
+/**
+ * @brief Get parent.
+ * @param[in] node is any lysc_node.
+ */
+static const void *
+troc_parent(const void *node)
+{
+    return ((const struct lysc_node *)node)->parent;
+}
+
+/**
+ * @brief Try to get child.
+ * @param[in] node is any lysc_node.
+ */
+static const void *
+troc_child(const void *node)
+{
+    return lysc_node_child(node);
+}
+
+/**
+ * @brief Try to get action.
+ * @param[in] node is any lysc_node.
+ */
+static const void *
+troc_actions(const void *node)
+{
+    return lysc_node_actions(node);
+}
+
+/**
+ * @brief Try to get action.
+ * @param[in] node must be of type lysc_node_action.
+ */
+static const void *
+troc_action_input(const void *node)
+{
+    return &((const struct lysc_node_action *)node)->input;
+}
+
+/**
+ * @brief Try to get action.
+ * @param[in] node must be of type lysc_node_action.
+ */
+static const void *
+troc_action_output(const void *node)
+{
+    return &((const struct lysc_node_action *)node)->output;
+}
+
+/**
+ * @brief Try to get action.
+ * @param[in] node is any lysc_node.
+ */
+static const void *
+troc_notifs(const void *node)
+{
+    return lysc_node_notifs(node);
+}
+
+/**
+ * @brief Fill struct tro_getters with @ref TRP_troc getters
+ * which are adapted to lysc nodes.
+ */
+static struct tro_getters
+troc_init_getters(void)
+{
+    return (struct tro_getters) {
+               .nodetype = troc_nodetype,
+               .next = troc_next,
+               .parent = troc_parent,
+               .child = troc_child,
+               .actions = troc_actions,
+               .action_input = troc_action_input,
+               .action_output = troc_action_output,
+               .notifs = troc_notifs
+    };
+}
+
+/**********************************************************************
+ * tro functions
+ *********************************************************************/
+
+/**
+ * @brief Call override function for @p node.
+ *
+ * @param[in] lysc_tree if @p node is compiled.
+ * @param[in] node to create override.
+ * @param[in] erase_node_overr if override structure must be reseted.
+ * @param[in,out] plc current plugin context.
+ * @return pointer to override structure or NULL. Override structure in @p plc is updated too.
+ */
+static struct lyplg_ext_sprinter_tree_node_override *
+tro_set_node_overr(ly_bool lysc_tree, const void *node, ly_bool erase_node_overr, struct trt_plugin_ctx *plc)
+{
+    LY_ERR rc = LY_SUCCESS;
+    struct lyplg_ext_sprinter_tree_node_override *no;
+    struct lyspr_tree_ctx *plug_ctx;
+    struct lysc_ext_instance *ce;
+    struct lysp_ext_instance *pe;
+
+    if (erase_node_overr) {
+        trp_ext_free_node_override(&plc->node_overr, &plc->filtered);
+    }
+    no = &plc->node_overr;
+    if (!plc->ctx && lysc_tree && (ce = trp_ext_is_present(lysc_tree, node))) {
+        rc = ce->def->plugin->printer_ctree(ce, NULL, &no->flags, &no->add_opts);
+    } else if (!plc->ctx && (pe = trp_ext_is_present(lysc_tree, node))) {
+        rc = pe->record->plugin.printer_ptree(pe, NULL, &no->flags, &no->add_opts);
+    } else if (plc->ctx) {
+        if (plc->schema && plc->schema->compiled && plc->schema->cn_overr) {
+            rc = plc->schema->cn_overr(node, plc->ctx->plugin_priv, &plc->filtered, &no->flags, &no->add_opts);
+        } else if (plc->schema && plc->schema->pn_overr) {
+            rc = plc->schema->pn_overr(node, plc->ctx->plugin_priv, &plc->filtered, &no->flags, &no->add_opts);
+        } else {
+            no = NULL;
+        }
+        if (trp_ext_is_present(lysc_tree, node)) {
+            plug_ctx = plc->ctx;
+            plc->ctx = NULL;
+            tro_set_node_overr(lysc_tree, node, 0, plc);
+            plc->ctx = plug_ctx;
+        }
+    } else {
+        no = NULL;
+    }
+
+    if (rc) {
+        plc->last_error = rc;
+        no = NULL;
+    }
+
+    return no;
+}
+
+/**
+ * @brief Get next sibling of the current node.
+ *
+ * This is a general algorithm that is able to
+ * work with lysp_node or lysc_node.
+ *
+ * @param[in] node points to lysp_node or lysc_node.
+ * @param[in] tc current tree context.
+ * @return next sibling node.
+ */
+static const void *
+tro_next_sibling(const void *node, const struct trt_tree_ctx *tc)
+{
+    struct tro_getters get;
+    struct trt_plugin_ctx plugin_ctx;
+    const void *tmp, *parent, *sibl;
+
+    assert(node);
+
+    get = tc->lysc_tree ? troc_init_getters() : trop_init_getters();
+
+    if (get.nodetype(node) & (LYS_RPC | LYS_ACTION)) {
+        if ((tmp = get.next(node))) {
+            /* next action exists */
+            sibl = tmp;
+        } else if ((parent = get.parent(node))) {
+            /* maybe if notif exists as sibling */
+            sibl = get.notifs(parent);
+        } else {
+            sibl = NULL;
+        }
+    } else if (get.nodetype(node) & LYS_INPUT) {
+        if ((parent = get.parent(node))) {
+            /* if output action has data */
+            if (get.child(get.action_output(parent))) {
+                /* then next sibling is output action */
+                sibl = get.action_output(parent);
+            } else {
+                /* input action cannot have siblings other
+                 * than output action.
+                 */
+                sibl = NULL;
+            }
+        } else {
+            /* there is no way how to get output action */
+            sibl = NULL;
+        }
+    } else if (get.nodetype(node) & LYS_OUTPUT) {
+        /* output action cannot have siblings */
+        sibl = NULL;
+    } else if (get.nodetype(node) & LYS_NOTIF) {
+        /* must have as a sibling only notif */
+        sibl = get.next(node);
+    } else {
+        /* for rest of nodes */
+        if ((tmp = get.next(node))) {
+            /* some sibling exists */
+            sibl = tmp;
+        } else if ((parent = get.parent(node))) {
+            /* Action and notif are siblings too.
+             * They can be reached through parent.
+             */
+            if ((tmp = get.actions(parent))) {
+                /* next sibling is action */
+                sibl = tmp;
+            } else if ((tmp = get.notifs(parent))) {
+                /* next sibling is notif */
+                sibl = tmp;
+            } else {
+                /* sibling not exists */
+                sibl = NULL;
+            }
+        } else {
+            /* sibling not exists */
+            sibl = NULL;
+        }
+    }
+
+    plugin_ctx = tc->plugin_ctx;
+    if (sibl && tro_set_node_overr(tc->lysc_tree, sibl, 1, &plugin_ctx) && plugin_ctx.filtered) {
+        return tro_next_sibling(sibl, tc);
+    }
+
+    return sibl;
+}
+
+/**
+ * @brief Get child of the current node.
+ *
+ * This is a general algorithm that is able to
+ * work with lysp_node or lysc_node.
+ *
+ * @param[in] node points to lysp_node or lysc_node.
+ * @param[in] tc current tree context.
+ * @return child node.
+ */
+static const void *
+tro_next_child(const void *node, const struct trt_tree_ctx *tc)
+{
+    struct tro_getters get;
+    struct trt_plugin_ctx plugin_ctx;
+    const void *tmp, *child;
+
+    assert(node);
+
+    get = tc->lysc_tree ? troc_init_getters() : trop_init_getters();
+
+    if (get.nodetype(node) & (LYS_ACTION | LYS_RPC)) {
+        if (get.child(get.action_input(node))) {
+            /* go to LYS_INPUT */
+            child = get.action_input(node);
+        } else if (get.child(get.action_output(node))) {
+            /* go to LYS_OUTPUT */
+            child = get.action_output(node);
+        } else {
+            /* input action and output action have no data */
+            child = NULL;
+        }
+    } else {
+        if ((tmp = get.child(node))) {
+            child = tmp;
+        } else {
+            /* current node can't have children or has no children */
+            /* but maybe has some actions or notifs */
+            if ((tmp = get.actions(node))) {
+                child = tmp;
+            } else if ((tmp = get.notifs(node))) {
+                child = tmp;
+            } else {
+                child = NULL;
+            }
+        }
+    }
+
+    plugin_ctx = tc->plugin_ctx;
+    if (child && tro_set_node_overr(tc->lysc_tree, child, 1, &plugin_ctx) && plugin_ctx.filtered) {
+        return tro_next_sibling(child, tc);
+    }
+
+    return child;
+}
+
+/**
+ * @brief Get new trt_parent_cache if we apply the transfer
+ * to the child node in the tree.
+ * @param[in] ca is parent cache for current node.
+ * @param[in] tc contains current tree node.
+ * @return Cache for the current node.
+ */
+static struct trt_parent_cache
+tro_parent_cache_for_child(struct trt_parent_cache ca, const struct trt_tree_ctx *tc)
+{
+    struct trt_parent_cache ret = TRP_EMPTY_PARENT_CACHE;
+
+    if (!tc->lysc_tree) {
+        const struct lysp_node *pn = tc->pn;
+
+        ret.ancestor =
+                pn->nodetype & (LYS_INPUT) ? TRD_ANCESTOR_RPC_INPUT :
+                pn->nodetype & (LYS_OUTPUT) ? TRD_ANCESTOR_RPC_OUTPUT :
+                pn->nodetype & (LYS_NOTIF) ? TRD_ANCESTOR_NOTIF :
+                ca.ancestor;
+
+        ret.lys_status =
+                pn->flags & (LYS_STATUS_CURR | LYS_STATUS_DEPRC | LYS_STATUS_OBSLT) ? pn->flags :
+                ca.lys_status;
+
+        ret.lys_config =
+                ca.ancestor == TRD_ANCESTOR_RPC_INPUT ? 0 : /* because <flags> will be -w */
+                ca.ancestor == TRD_ANCESTOR_RPC_OUTPUT ? LYS_CONFIG_R :
+                pn->flags & (LYS_CONFIG_R | LYS_CONFIG_W) ? pn->flags :
+                ca.lys_config;
+
+        ret.last_list =
+                pn->nodetype & (LYS_LIST) ? (struct lysp_node_list *)pn :
+                ca.last_list;
+    }
+
+    return ret;
+}
+
+/**
+ * @brief Transformation of the Schema nodes flags to
+ * Tree diagram \<status\>.
+ * @param[in] flags is node's flags obtained from the tree.
+ */
+static char *
+tro_flags2status(uint16_t flags)
+{
+    return flags & LYS_STATUS_OBSLT ? "o" :
+           flags & LYS_STATUS_DEPRC ? "x" :
+           "+";
+}
+
+/**
+ * @brief Transformation of the Schema nodes flags to Tree diagram
+ * \<flags\> but more specifically 'ro' or 'rw'.
+ * @param[in] flags is node's flags obtained from the tree.
+ */
+static char *
+tro_flags2config(uint16_t flags)
+{
+    return flags & LYS_CONFIG_R ? TRD_FLAGS_TYPE_RO :
+           flags & LYS_CONFIG_W ? TRD_FLAGS_TYPE_RW :
+           TRD_FLAGS_TYPE_EMPTY;
+}
+
+/**
+ * @brief Print current node's iffeatures.
+ * @param[in] tc is tree context.
+ * @param[in,out] out is output handler.
+ */
+static void
+tro_print_features_names(const struct trt_tree_ctx *tc, struct ly_out *out)
+{
+    const struct lysp_qname *iffs;
+
+    if (tc->lysc_tree) {
+        assert(TRP_TREE_CTX_LYSP_NODE_PRESENT(tc->cn));
+        iffs = TRP_TREE_CTX_GET_LYSP_NODE(tc->cn)->iffeatures;
+    } else {
+        iffs = tc->pn->iffeatures;
+    }
+    LY_ARRAY_COUNT_TYPE i;
+
+    LY_ARRAY_FOR(iffs, i) {
+        if (i == 0) {
+            ly_print_(out, "%s", iffs[i].str);
+        } else {
+            ly_print_(out, ",%s", iffs[i].str);
+        }
+    }
+
+}
+
+/**
+ * @brief Print current list's keys.
+ *
+ * Well, actually printing keys in the lysp_tree is trivial,
+ * because char* points to all keys. However, special functions have
+ * been reserved for this, because in principle the list of elements
+ * can have more implementations.
+ *
+ * @param[in] tc is tree context.
+ * @param[in,out] out is output handler.
+ */
+static void
+tro_print_keys(const struct trt_tree_ctx *tc, struct ly_out *out)
+{
+    const struct lysp_node_list *list;
+
+    if (tc->lysc_tree) {
+        assert(TRP_TREE_CTX_LYSP_NODE_PRESENT(tc->cn));
+        list = (const struct lysp_node_list *)TRP_TREE_CTX_GET_LYSP_NODE(tc->cn);
+    } else {
+        list = (const struct lysp_node_list *)tc->pn;
+    }
+    assert(list->nodetype & LYS_LIST);
+
+    if (trg_charptr_has_data(list->key)) {
+        ly_print_(out, "%s", list->key);
+    }
+}
+
+/**
+ * @brief Get address of the current node.
+ * @param[in] tc contains current node.
+ * @return Address of lysc_node or lysp_node, or NULL.
+ */
+static const void *
+tro_tree_ctx_get_node(const struct trt_tree_ctx *tc)
+{
+    return tc->lysc_tree ?
+           (const void *)tc->cn :
+           (const void *)tc->pn;
+}
+
+/**
+ * @brief Get address of current node's child.
+ * @param[in,out] tc contains current node.
+ */
+static const void *
+tro_tree_ctx_get_child(const struct trt_tree_ctx *tc)
+{
+    if (!tro_tree_ctx_get_node(tc)) {
+        return NULL;
+    }
+
+    if (tc->lysc_tree) {
+        return lysc_node_child(tc->cn);
+    } else {
+        return lysp_node_child(tc->pn);
+    }
+}
+
+/**
+ * @brief Get rpcs section if exists.
+ * @param[in,out] tc is tree context.
+ * @return Section representation if it exists. The @p tc is modified
+ * and his pointer points to the first node in rpcs section.
+ * @return Empty section representation otherwise.
+ */
+static struct trt_keyword_stmt
+tro_modi_get_rpcs(struct trt_tree_ctx *tc)
+{
+    assert(tc);
+    const void *actions;
+    struct trt_keyword_stmt ret = {0};
+
+    if (tc->lysc_tree) {
+        actions = tc->cmod->rpcs;
+        if (actions) {
+            tc->cn = actions;
+        }
+    } else {
+        actions = tc->pmod->rpcs;
+        if (actions) {
+            tc->pn = actions;
+            tc->tpn = tc->pn;
+        }
+    }
+
+    if (actions) {
+        tc->section = TRD_SECT_RPCS;
+        ret.section_name = TRD_KEYWORD_RPC;
+        ret.has_node = tro_tree_ctx_get_node(tc) ? 1 : 0;
+    }
+
+    return ret;
+}
+
+/**
+ * @brief Get notification section if exists
+ * @param[in,out] tc is tree context.
+ * @return Section representation if it exists.
+ * The @p tc is modified and his pointer points to the
+ * first node in notification section.
+ * @return Empty section representation otherwise.
+ */
+static struct trt_keyword_stmt
+tro_modi_get_notifications(struct trt_tree_ctx *tc)
+{
+    assert(tc);
+    const void *notifs;
+    struct trt_keyword_stmt ret = {0};
+
+    if (tc->lysc_tree) {
+        notifs = tc->cmod->notifs;
+        if (notifs) {
+            tc->cn = notifs;
+        }
+    } else {
+        notifs = tc->pmod->notifs;
+        if (notifs) {
+            tc->pn = notifs;
+            tc->tpn = tc->pn;
+        }
+    }
+
+    if (notifs) {
+        tc->section = TRD_SECT_NOTIF;
+        ret.section_name = TRD_KEYWORD_NOTIF;
+        ret.has_node = tro_tree_ctx_get_node(tc) ? 1 : 0;
+    }
+
+    return ret;
+}
+
+static struct trt_keyword_stmt
+tro_get_ext_section(struct trt_tree_ctx *tc, void *ext, struct lyspr_tree_ctx *plug_ctx)
+{
+    struct trt_keyword_stmt ret = {0};
+    struct lysc_ext_instance *ce = NULL;
+    struct lysp_ext_instance *pe = NULL;
+
+    if (tc->lysc_tree) {
+        ce = ext;
+        ret.section_name = ce->def->name;
+        ret.argument = ce->argument;
+        ret.has_node = plug_ctx->schemas->ctree ? 1 : 0;
+    } else {
+        pe = ext;
+        ret.section_name = pe->def->name;
+        ret.argument = pe->argument;
+        ret.has_node = plug_ctx->schemas->ptree ? 1 : 0;
+    }
+
+    return ret;
+}
+
+/**
+ * @brief Get name of the module.
+ * @param[in] tc is context of the tree.
+ */
+static struct trt_keyword_stmt
+tro_read_module_name(const struct trt_tree_ctx *tc)
+{
+    assert(tc);
+    struct trt_keyword_stmt ret;
+
+    ret.section_name = !tc->lysc_tree && tc->pmod->is_submod ?
+            TRD_KEYWORD_SUBMODULE :
+            TRD_KEYWORD_MODULE;
+
+    ret.argument = !tc->lysc_tree ?
+            LYSP_MODULE_NAME(tc->pmod) :
+            tc->cmod->mod->name;
+
+    ret.has_node = tro_tree_ctx_get_node(tc) ? 1 : 0;
+
+    return ret;
+}
+
+static ly_bool
+tro_read_if_sibling_exists(const struct trt_tree_ctx *tc)
+{
+    const void *parent;
+
+    if (tc->lysc_tree) {
+        parent = troc_parent(tc->cn);
+    } else {
+        parent = trop_parent(tc->pn);
+    }
+
+    return parent ? 1 : 0;
+}
+
+/**
+ * @brief Create implicit "case" node as parent of @p node.
+ * @param[in] node child of implicit case node.
+ * @param[out] case_node created case node.
+ */
+static void
+tro_create_implicit_case_node(const struct trt_node *node, struct trt_node *case_node)
+{
+    case_node->status = node->status;
+    case_node->flags = TRD_FLAGS_TYPE_EMPTY;
+    case_node->name.type = TRD_NODE_CASE;
+    case_node->name.keys = node->name.keys;
+    case_node->name.module_prefix = node->name.module_prefix;
+    case_node->name.str = node->name.str;
+    case_node->name.opts = node->name.opts;
+    case_node->name.add_opts = node->name.add_opts;
+    case_node->type = TRP_EMPTY_TRT_TYPE;
+    case_node->iffeatures = TRP_EMPTY_TRT_IFFEATURES;
+    case_node->last_one = node->last_one;
+}
+
+/**********************************************************************
+ * Definition of trop reading functions
+ *********************************************************************/
+
+/**
+ * @brief Check if list statement has keys.
+ * @param[in] pn is pointer to the list.
+ * @return 1 if has keys, otherwise 0.
+ */
+static ly_bool
+trop_list_has_keys(const struct lysp_node *pn)
+{
+    return trg_charptr_has_data(((const struct lysp_node_list *)pn)->key);
+}
+
+/**
+ * @brief Check if it contains at least one feature.
+ * @param[in] pn is current node.
+ * @return 1 if has if-features, otherwise 0.
+ */
+static ly_bool
+trop_node_has_iffeature(const struct lysp_node *pn)
+{
+    LY_ARRAY_COUNT_TYPE u;
+    const struct lysp_qname *iffs;
+
+    ly_bool ret = 0;
+
+    iffs = pn->iffeatures;
+    LY_ARRAY_FOR(iffs, u) {
+        ret = 1;
+        break;
+    }
+    return ret;
+}
+
+/**
+ * @brief Find out if leaf is also the key in last list.
+ * @param[in] pn is pointer to leaf.
+ * @param[in] ca_last_list is pointer to last visited list.
+ * Obtained from trt_parent_cache.
+ * @return 1 if leaf is also the key, otherwise 0.
+ */
+static ly_bool
+trop_leaf_is_key(const struct lysp_node *pn, const struct lysp_node_list *ca_last_list)
+{
+    const struct lysp_node_leaf *leaf = (const struct lysp_node_leaf *)pn;
+    const struct lysp_node_list *list = ca_last_list;
+
+    if (!list) {
+        return 0;
+    }
+    return trg_charptr_has_data(list->key) ?
+           trg_word_is_present(list->key, leaf->name, ' ') : 0;
+}
+
+/**
+ * @brief Check if container's type is presence.
+ * @param[in] pn is pointer to container.
+ * @return 1 if container has presence statement, otherwise 0.
+ */
+static ly_bool
+trop_container_has_presence(const struct lysp_node *pn)
+{
+    return trg_charptr_has_data(((struct lysp_node_container *)pn)->presence);
+}
+
+/**
+ * @brief Get leaflist's path without lysp_node type control.
+ * @param[in] pn is pointer to the leaflist.
+ */
+static const char *
+trop_leaflist_refpath(const struct lysp_node *pn)
+{
+    const struct lysp_node_leaflist *list = (const struct lysp_node_leaflist *)pn;
+
+    return list->type.path ? list->type.path->expr : NULL;
+}
+
+/**
+ * @brief Get leaflist's type name without lysp_node type control.
+ * @param[in] pn is pointer to the leaflist.
+ */
+static const char *
+trop_leaflist_type_name(const struct lysp_node *pn)
+{
+    const struct lysp_node_leaflist *list = (const struct lysp_node_leaflist *)pn;
+
+    return list->type.name;
+}
+
+/**
+ * @brief Get leaf's path without lysp_node type control.
+ * @param[in] pn is pointer to the leaf node.
+ */
+static const char *
+trop_leaf_refpath(const struct lysp_node *pn)
+{
+    const struct lysp_node_leaf *leaf = (const struct lysp_node_leaf *)pn;
+
+    return leaf->type.path ? leaf->type.path->expr : NULL;
+}
+
+/**
+ * @brief Get leaf's type name without lysp_node type control.
+ * @param[in] pn is pointer to the leaf's type name.
+ */
+static const char *
+trop_leaf_type_name(const struct lysp_node *pn)
+{
+    const struct lysp_node_leaf *leaf = (const struct lysp_node_leaf *)pn;
+
+    return leaf->type.name;
+}
+
+/**
+ * @brief Get pointer to data using node type specification
+ * and getter function.
+ *
+ * @param[in] flags is node type specification.
+ * If it is the correct node, the getter function is called.
+ * @param[in] f is getter function which provides the desired
+ * char pointer from the structure.
+ * @param[in] pn pointer to node.
+ * @return NULL if node has wrong type or getter function return
+ * pointer to NULL.
+ * @return Pointer to desired char pointer obtained from the node.
+ */
+static const char *
+trop_node_charptr(uint16_t flags, trt_get_charptr_func f, const struct lysp_node *pn)
+{
+    if (pn->nodetype & flags) {
+        const char *ret = f(pn);
+
+        return trg_charptr_has_data(ret) ? ret : NULL;
+    } else {
+        return NULL;
+    }
+}
+
+/**
+ * @brief Resolve \<status\> of the current node.
+ * @param[in] nodetype is node's type obtained from the tree.
+ * @param[in] flags is node's flags obtained from the tree.
+ * @param[in] ca_lys_status is inherited status obtained from trt_parent_cache.
+ * @return The status type.
+ */
+static char *
+trop_resolve_status(uint16_t nodetype, uint16_t flags, uint16_t ca_lys_status)
+{
+    if (nodetype & (LYS_INPUT | LYS_OUTPUT)) {
+        /* LYS_INPUT and LYS_OUTPUT is special case */
+        return tro_flags2status(ca_lys_status);
+        /* if ancestor's status is deprc or obslt
+         * and also node's status is not set
+         */
+    } else if ((ca_lys_status & (LYS_STATUS_DEPRC | LYS_STATUS_OBSLT)) && !(flags & (LYS_STATUS_CURR | LYS_STATUS_DEPRC | LYS_STATUS_OBSLT))) {
+        /* get ancestor's status */
+        return tro_flags2status(ca_lys_status);
+    } else {
+        /* else get node's status */
+        return tro_flags2status(flags);
+    }
+}
+
+/**
+ * @brief Resolve \<flags\> of the current node.
+ * @param[in] nodetype is node's type obtained from the tree.
+ * @param[in] flags is node's flags obtained from the tree.
+ * @param[in] ca_ancestor is ancestor type obtained from trt_parent_cache.
+ * @param[in] ca_lys_config is inherited config item obtained from trt_parent_cache.
+ * @param[in] no Override structure for flags.
+ * @return The flags type.
+ */
+static const char *
+trop_resolve_flags(uint16_t nodetype, uint16_t flags, trt_ancestor_type ca_ancestor, uint16_t ca_lys_config,
+        struct lyplg_ext_sprinter_tree_node_override *no)
+{
+    if (no && no->flags) {
+        return no->flags;
+    } else if ((nodetype & LYS_INPUT) || (ca_ancestor == TRD_ANCESTOR_RPC_INPUT)) {
+        return TRD_FLAGS_TYPE_RPC_INPUT_PARAMS;
+    } else if ((nodetype & LYS_OUTPUT) || (ca_ancestor == TRD_ANCESTOR_RPC_OUTPUT)) {
+        return TRD_FLAGS_TYPE_RO;
+    } else if (ca_ancestor == TRD_ANCESTOR_NOTIF) {
+        return TRD_FLAGS_TYPE_RO;
+    } else if (nodetype & LYS_NOTIF) {
+        return TRD_FLAGS_TYPE_NOTIF;
+    } else if (nodetype & LYS_USES) {
+        return TRD_FLAGS_TYPE_USES_OF_GROUPING;
+    } else if (nodetype & (LYS_RPC | LYS_ACTION)) {
+        return TRD_FLAGS_TYPE_RPC;
+    } else if (!(flags & (LYS_CONFIG_R | LYS_CONFIG_W))) {
+        /* config is not set. Look at ancestor's config */
+        return tro_flags2config(ca_lys_config);
+    } else {
+        return tro_flags2config(flags);
+    }
+}
+
+/**
+ * @brief Resolve node type of the current node.
+ * @param[in] pn is pointer to the current node in the tree.
+ * @param[in] ca_last_list is pointer to the last visited list. Obtained from the trt_parent_cache.
+ * @param[out] type Resolved type of node.
+ * @param[out] opts Resolved opts of node.
+ */
+static void
+trop_resolve_node_opts(const struct lysp_node *pn, const struct lysp_node_list *ca_last_list, trt_node_type *type,
+        const char **opts)
+{
+    if (pn->nodetype & (LYS_INPUT | LYS_OUTPUT)) {
+        *type = TRD_NODE_ELSE;
+    } else if (pn->nodetype & LYS_CASE) {
+        *type = TRD_NODE_CASE;
+    } else if ((pn->nodetype & LYS_CHOICE) && !(pn->flags & LYS_MAND_TRUE)) {
+        *type = TRD_NODE_CHOICE;
+        *opts = TRD_NODE_OPTIONAL;
+    } else if (pn->nodetype & LYS_CHOICE) {
+        *type = TRD_NODE_CHOICE;
+    } else if ((pn->nodetype & LYS_CONTAINER) && (trop_container_has_presence(pn))) {
+        *opts = TRD_NODE_CONTAINER;
+    } else if (pn->nodetype & (LYS_LIST | LYS_LEAFLIST)) {
+        *opts = TRD_NODE_LISTLEAFLIST;
+    } else if ((pn->nodetype & (LYS_ANYDATA | LYS_ANYXML)) && !(pn->flags & LYS_MAND_TRUE)) {
+        *opts = TRD_NODE_OPTIONAL;
+    } else if ((pn->nodetype & LYS_LEAF) && !(pn->flags & LYS_MAND_TRUE) && (!trop_leaf_is_key(pn, ca_last_list))) {
+        *opts = TRD_NODE_OPTIONAL;
+    } else {
+        *type = TRD_NODE_ELSE;
+    }
+}
+
+/**
+ * @brief Resolve \<type\> of the current node.
+ * @param[in] pn is current node.
+ * @return Resolved type.
+ */
+static struct trt_type
+trop_resolve_type(const struct lysp_node *pn)
+{
+    const char *tmp = NULL;
+
+    if (!pn) {
+        return TRP_EMPTY_TRT_TYPE;
+    } else if ((tmp = trop_node_charptr(LYS_LEAFLIST, trop_leaflist_refpath, pn))) {
+        return TRP_INIT_TRT_TYPE(TRD_TYPE_TARGET, tmp);
+    } else if ((tmp = trop_node_charptr(LYS_LEAFLIST, trop_leaflist_type_name, pn))) {
+        return TRP_INIT_TRT_TYPE(TRD_TYPE_NAME, tmp);
+    } else if ((tmp = trop_node_charptr(LYS_LEAF, trop_leaf_refpath, pn))) {
+        return TRP_INIT_TRT_TYPE(TRD_TYPE_TARGET, tmp);
+    } else if ((tmp = trop_node_charptr(LYS_LEAF, trop_leaf_type_name, pn))) {
+        return TRP_INIT_TRT_TYPE(TRD_TYPE_NAME, tmp);
+    } else if (pn->nodetype == LYS_ANYDATA) {
+        return TRP_INIT_TRT_TYPE(TRD_TYPE_NAME, "anydata");
+    } else if (pn->nodetype & LYS_ANYXML) {
+        return TRP_INIT_TRT_TYPE(TRD_TYPE_NAME, "anyxml");
+    } else {
+        return TRP_EMPTY_TRT_TYPE;
+    }
+}
+
+/**
+ * @brief Resolve iffeatures.
+ *
+ * @param[in] pn is current parsed node.
+ * @return Resolved iffeatures.
+ */
+static struct trt_iffeatures
+trop_resolve_iffeatures(const struct lysp_node *pn)
+{
+    struct trt_iffeatures iff;
+
+    if (pn && trop_node_has_iffeature(pn)) {
+        iff.type = TRD_IFF_PRESENT;
+        iff.str = NULL;
+    } else {
+        iff.type = TRD_IFF_NON_PRESENT;
+        iff.str = NULL;
+    }
+
+    return iff;
+}
+
+/**
+ * @brief Transformation of current lysp_node to struct trt_node.
+ * @param[in] ca contains stored important data
+ * when browsing the tree downwards.
+ * @param[in] tc is context of the tree.
+ */
+static struct trt_node
+trop_read_node(struct trt_parent_cache ca, struct trt_tree_ctx *tc)
+{
+    const struct lysp_node *pn;
+    struct trt_node ret;
+    struct lyplg_ext_sprinter_tree_node_override *no;
+
+    assert(tc && tc->pn && tc->pn->nodetype != LYS_UNKNOWN);
+
+    no = tro_set_node_overr(tc->lysc_tree, tc->pn, 1, &tc->plugin_ctx);
+
+    pn = tc->pn;
+    ret = TRP_EMPTY_NODE;
+
+    /* <status> */
+    ret.status = trop_resolve_status(pn->nodetype, pn->flags, ca.lys_status);
+
+    /* <flags> */
+    ret.flags = trop_resolve_flags(pn->nodetype, pn->flags, ca.ancestor, ca.lys_config, no);
+
+    /* set type of the node */
+    trop_resolve_node_opts(pn, ca.last_list, &ret.name.type, &ret.name.opts);
+    ret.name.add_opts = no && no->add_opts ? no->add_opts : NULL;
+    ret.name.keys = (tc->pn->nodetype & LYS_LIST) && trop_list_has_keys(tc->pn);
+
+    /* The parsed tree is not compiled, so no node can be augmented
+     * from another module. This means that nodes from the parsed tree
+     * will never have the prefix.
+     */
+    ret.name.module_prefix = NULL;
+
+    /* set node's name */
+    ret.name.str = pn->name;
+
+    /* <type> */
+    ret.type = trop_resolve_type(pn);
+
+    /* <iffeature> */
+    ret.iffeatures = trop_resolve_iffeatures(pn);
+
+    ret.last_one = !tro_next_sibling(pn, tc);
+
+    return ret;
+}
+
+/**
+ * @brief Find out if the current node has siblings.
+ * @param[in] tc is context of the tree.
+ * @return 1 if sibling exists otherwise 0.
+ */
+static ly_bool
+trop_read_if_sibling_exists(const struct trt_tree_ctx *tc)
+{
+    return tro_next_sibling(tc->pn, tc) != NULL;
+}
+
+/**********************************************************************
+ * Modify trop getters
+ *********************************************************************/
+
+/**
+ * @brief Change current node pointer to its parent
+ * but only if parent exists.
+ * @param[in,out] tc is tree context.
+ * Contains pointer to the current node.
+ * @return 1 if the node had parents and the change was successful.
+ * @return 0 if the node did not have parents.
+ * The pointer to the current node did not change.
+ */
+static ly_bool
+trop_modi_parent(struct trt_tree_ctx *tc)
+{
+    assert(tc && tc->pn);
+    /* If no parent exists, stay in actual node. */
+    if ((tc->pn != tc->tpn) && (tc->pn->parent)) {
+        tc->pn = tc->pn->parent;
+        return 1;
+    } else {
+        return 0;
+    }
+}
+
+/**
+ * @brief Change the current node pointer to its child
+ * but only if exists.
+ * @param[in] ca contains inherited data from ancestors.
+ * @param[in,out] tc is context of the tree.
+ * Contains pointer to the current node.
+ * @return Non-empty \<node\> representation of the current
+ * node's child. The @p tc is modified.
+ * @return Empty \<node\> representation if child don't exists.
+ * The @p tc is not modified.
+ */
+static struct trt_node
+trop_modi_next_child(struct trt_parent_cache ca, struct trt_tree_ctx *tc)
+{
+    const struct lysp_node *tmp;
+
+    assert(tc && tc->pn);
+
+    if ((tmp = tro_next_child(tc->pn, tc))) {
+        tc->pn = tmp;
+        return trop_read_node(ca, tc);
+    } else {
+        return TRP_EMPTY_NODE;
+    }
+}
+
+/**
+ * @brief Change the pointer to the current node to its next sibling
+ * only if exists.
+ * @param[in] ca contains inherited data from ancestors.
+ * @param[in,out] tc is tree context.
+ * Contains pointer to the current node.
+ * @return Non-empty \<node\> representation if sibling exists.
+ * The @p tc is modified.
+ * @return Empty \<node\> representation otherwise.
+ * The @p tc is not modified.
+ */
+static struct trt_node
+trop_modi_next_sibling(struct trt_parent_cache ca, struct trt_tree_ctx *tc)
+{
+    const struct lysp_node *pn;
+
+    assert(tc && tc->pn);
+
+    pn = tro_next_sibling(tc->pn, tc);
+
+    if (pn) {
+        if ((tc->tpn == tc->pn) && (tc->section != TRD_SECT_PLUG_DATA)) {
+            tc->tpn = pn;
+        }
+        tc->pn = pn;
+        return trop_read_node(ca, tc);
+    } else {
+        return TRP_EMPTY_NODE;
+    }
+}
+
+/**
+ * @brief Change the current node pointer to the first child of node's
+ * parent. If current node is already first sibling/child then nothing
+ * will change.
+ * @param[in] ca Settings of parent.
+ * @param[in,out] tc is tree context.
+ * @return node for printing.
+ */
+static struct trt_node
+trop_modi_first_sibling(struct trt_parent_cache ca, struct trt_tree_ctx *tc)
+{
+    struct trt_node node;
+
+    assert(tc && tc->pn);
+
+    if (trop_modi_parent(tc)) {
+        node = trop_modi_next_child(ca, tc);
+    } else if (tc->plugin_ctx.schema) {
+        tc->pn = tc->plugin_ctx.schema->ptree;
+        tc->tpn = tc->pn;
+        node = trop_read_node(ca, tc);
+    } else {
+        /* current node is top-node */
+        switch (tc->section) {
+        case TRD_SECT_MODULE:
+            tc->pn = tc->pmod->data;
+            tc->tpn = tc->pn;
+            break;
+        case TRD_SECT_AUGMENT:
+            tc->pn = (const struct lysp_node *)tc->pmod->augments;
+            tc->tpn = tc->pn;
+            break;
+        case TRD_SECT_RPCS:
+            tc->pn = (const struct lysp_node *)tc->pmod->rpcs;
+            tc->tpn = tc->pn;
+            break;
+        case TRD_SECT_NOTIF:
+            tc->pn = (const struct lysp_node *)tc->pmod->notifs;
+            tc->tpn = tc->pn;
+            break;
+        case TRD_SECT_GROUPING:
+            tc->pn = (const struct lysp_node *)tc->pmod->groupings;
+            tc->tpn = tc->pn;
+            break;
+        case TRD_SECT_PLUG_DATA:
+            /* Nothing to do. */
+            break;
+        default:
+            assert(0);
+        }
+        node = trop_read_node(ca, tc);
+    }
+
+    if (tc->plugin_ctx.filtered) {
+        node = trop_modi_next_sibling(ca, tc);
+    }
+
+    return node;
+}
+
+/**
+ * @brief Get next (or first) augment section if exists.
+ * @param[in,out] tc is tree context. It is modified and his current
+ * node is set to the lysp_node_augment.
+ * @return Section's representation if (next augment) section exists.
+ * @return Empty section structure otherwise.
+ */
+static struct trt_keyword_stmt
+trop_modi_next_augment(struct trt_tree_ctx *tc)
+{
+    assert(tc);
+    const struct lysp_node_augment *augs;
+    struct trt_keyword_stmt ret = {0};
+
+    /* if next_augment func was called for the first time */
+    if (tc->section != TRD_SECT_AUGMENT) {
+        tc->section = TRD_SECT_AUGMENT;
+        augs = tc->pmod->augments;
+    } else {
+        /* get augment sibling from top-node pointer */
+        augs = (const struct lysp_node_augment *)tc->tpn->next;
+    }
+
+    if (augs) {
+        tc->pn = &augs->node;
+        tc->tpn = tc->pn;
+        ret.section_name = TRD_KEYWORD_AUGMENT;
+        ret.argument = augs->nodeid;
+        ret.has_node = tro_tree_ctx_get_node(tc) ? 1 : 0;
+    }
+
+    return ret;
+}
+
+/**
+ * @brief Get next (or first) grouping section if exists
+ * @param[in,out] tc is tree context. It is modified and his current
+ * node is set to the lysp_node_grp.
+ * @return The next (or first) section representation if it exists.
+ * @return Empty section representation otherwise.
+ */
+static struct trt_keyword_stmt
+trop_modi_next_grouping(struct trt_tree_ctx *tc)
+{
+    assert(tc);
+    const struct lysp_node_grp *grps;
+    struct trt_keyword_stmt ret = {0};
+
+    if (tc->section != TRD_SECT_GROUPING) {
+        tc->section = TRD_SECT_GROUPING;
+        grps = tc->pmod->groupings;
+    } else {
+        grps = (const struct lysp_node_grp *)tc->tpn->next;
+    }
+
+    if (grps) {
+        tc->pn = &grps->node;
+        tc->tpn = tc->pn;
+        ret.section_name = TRD_KEYWORD_GROUPING;
+        ret.argument = grps->name;
+        ret.has_node = tro_tree_ctx_get_child(tc) ? 1 : 0;
+    }
+
+    return ret;
+}
+
+/**********************************************************************
+ * Definition of troc reading functions
+ *********************************************************************/
+
+/**
+ * @copydoc trop_read_if_sibling_exists
+ */
+static ly_bool
+troc_read_if_sibling_exists(const struct trt_tree_ctx *tc)
+{
+    return tro_next_sibling(tc->cn, tc) != NULL;
+}
+
+/**
+ * @brief Resolve \<flags\> of the current node.
+ *
+ * Use this function only if trt_tree_ctx.lysc_tree is true.
+ *
+ * @param[in] nodetype is current lysc_node.nodetype.
+ * @param[in] flags is current lysc_node.flags.
+ * @param[in] no Override structure for flags.
+ * @return The flags type.
+ */
+static const char *
+troc_resolve_flags(uint16_t nodetype, uint16_t flags, struct lyplg_ext_sprinter_tree_node_override *no)
+{
+    if (no && no->flags) {
+        return no->flags;
+    } else if ((nodetype & LYS_INPUT) || (flags & LYS_IS_INPUT)) {
+        return TRD_FLAGS_TYPE_RPC_INPUT_PARAMS;
+    } else if ((nodetype & LYS_OUTPUT) || (flags & LYS_IS_OUTPUT)) {
+        return TRD_FLAGS_TYPE_RO;
+    } else if (nodetype & LYS_IS_NOTIF) {
+        return TRD_FLAGS_TYPE_RO;
+    } else if (nodetype & LYS_NOTIF) {
+        return TRD_FLAGS_TYPE_NOTIF;
+    } else if (nodetype & LYS_USES) {
+        return TRD_FLAGS_TYPE_USES_OF_GROUPING;
+    } else if (nodetype & (LYS_RPC | LYS_ACTION)) {
+        return TRD_FLAGS_TYPE_RPC;
+    } else {
+        return tro_flags2config(flags);
+    }
+}
+
+/**
+ * @brief Resolve node type of the current node.
+ *
+ * Use this function only if trt_tree_ctx.lysc_tree is true.
+ *
+ * @param[in] nodetype is current lysc_node.nodetype.
+ * @param[in] flags is current lysc_node.flags.
+ * @param[out] type Resolved type of node.
+ * @param[out] opts Resolved opts.
+ */
+static void
+troc_resolve_node_opts(uint16_t nodetype, uint16_t flags, trt_node_type *type, const char **opts)
+{
+    if (nodetype & (LYS_INPUT | LYS_OUTPUT)) {
+        *type = TRD_NODE_ELSE;
+    } else if (nodetype & LYS_CASE) {
+        *type = TRD_NODE_CASE;
+    } else if ((nodetype & LYS_CHOICE) && !(flags & LYS_MAND_TRUE)) {
+        *type = TRD_NODE_CHOICE;
+        *opts = TRD_NODE_OPTIONAL;
+    } else if (nodetype & LYS_CHOICE) {
+        *type = TRD_NODE_CHOICE;
+    } else if ((nodetype & LYS_CONTAINER) && (flags & LYS_PRESENCE)) {
+        *opts = TRD_NODE_CONTAINER;
+    } else if (nodetype & (LYS_LIST | LYS_LEAFLIST)) {
+        *opts = TRD_NODE_LISTLEAFLIST;
+    } else if ((nodetype & (LYS_ANYDATA | LYS_ANYXML)) && !(flags & LYS_MAND_TRUE)) {
+        *opts = TRD_NODE_OPTIONAL;
+    } else if ((nodetype & LYS_LEAF) && !(flags & (LYS_MAND_TRUE | LYS_KEY))) {
+        *opts = TRD_NODE_OPTIONAL;
+    } else {
+        *type = TRD_NODE_ELSE;
+    }
+}
+
+/**
+ * @brief Resolve prefix (\<prefix\>:\<name\>) of node that has been
+ * placed from another module via an augment statement.
+ *
+ * @param[in] cn is current compiled node.
+ * @param[in] current_compiled_module is module whose nodes are
+ * currently being printed.
+ * @return Prefix of foreign module or NULL.
+ */
+static const char *
+troc_resolve_node_prefix(const struct lysc_node *cn, const struct lysc_module *current_compiled_module)
+{
+    const struct lys_module *node_module;
+    const char *ret = NULL;
+
+    node_module = cn->module;
+    if (!node_module || !current_compiled_module) {
+        return NULL;
+    } else if (node_module->compiled != current_compiled_module) {
+        ret = node_module->prefix;
+    }
+
+    return ret;
+}
+
+/**
+ * @brief Transformation of current lysc_node to struct trt_node.
+ * @param[in] ca is not used.
+ * @param[in] tc is context of the tree.
+ */
+static struct trt_node
+troc_read_node(struct trt_parent_cache ca, struct trt_tree_ctx *tc)
+{
+    (void) ca;
+    const struct lysc_node *cn;
+    struct trt_node ret;
+    struct lyplg_ext_sprinter_tree_node_override *no;
+
+    assert(tc && tc->cn);
+
+    no = tro_set_node_overr(tc->lysc_tree, tc->cn, 1, &tc->plugin_ctx);
+
+    cn = tc->cn;
+    ret = TRP_EMPTY_NODE;
+
+    /* <status> */
+    ret.status = tro_flags2status(cn->flags);
+
+    /* <flags> */
+    ret.flags = troc_resolve_flags(cn->nodetype, cn->flags, no);
+
+    /* set type of the node */
+    troc_resolve_node_opts(cn->nodetype, cn->flags, &ret.name.type, &ret.name.opts);
+    ret.name.add_opts = no && no->add_opts ? no->add_opts : NULL;
+    ret.name.keys = (cn->nodetype & LYS_LIST) && !(cn->flags & LYS_KEYLESS);
+
+    /* <prefix> */
+    ret.name.module_prefix = troc_resolve_node_prefix(cn, tc->cmod);
+
+    /* set node's name */
+    ret.name.str = cn->name;
+
+    /* <type> */
+    ret.type = trop_resolve_type(TRP_TREE_CTX_GET_LYSP_NODE(cn));
+
+    /* <iffeature> */
+    ret.iffeatures = trop_resolve_iffeatures(TRP_TREE_CTX_GET_LYSP_NODE(cn));
+
+    ret.last_one = !tro_next_sibling(cn, tc);
+
+    return ret;
+}
+
+/**********************************************************************
+ * Modify troc getters
+ *********************************************************************/
+
+/**
+ * @copydoc ::trop_modi_parent()
+ */
+static ly_bool
+troc_modi_parent(struct trt_tree_ctx *tc)
+{
+    assert(tc && tc->cn);
+    /* If no parent exists, stay in actual node. */
+    if (tc->cn->parent) {
+        tc->cn = tc->cn->parent;
+        return 1;
+    } else {
+        return 0;
+    }
+}
+
+/**
+ * @copydoc ::trop_modi_next_sibling()
+ */
+static struct trt_node
+troc_modi_next_sibling(struct trt_parent_cache ca, struct trt_tree_ctx *tc)
+{
+    const struct lysc_node *cn;
+
+    assert(tc && tc->cn);
+
+    cn = tro_next_sibling(tc->cn, tc);
+
+    /* if next sibling exists */
+    if (cn) {
+        /* update trt_tree_ctx */
+        tc->cn = cn;
+        return troc_read_node(ca, tc);
+    } else {
+        return TRP_EMPTY_NODE;
+    }
+}
+
+/**
+ * @copydoc trop_modi_next_child()
+ */
+static struct trt_node
+troc_modi_next_child(struct trt_parent_cache ca, struct trt_tree_ctx *tc)
+{
+    const struct lysc_node *tmp;
+
+    assert(tc && tc->cn);
+
+    if ((tmp = tro_next_child(tc->cn, tc))) {
+        tc->cn = tmp;
+        return troc_read_node(ca, tc);
+    } else {
+        return TRP_EMPTY_NODE;
+    }
+}
+
+/**
+ * @copydoc ::trop_modi_first_sibling()
+ */
+static struct trt_node
+troc_modi_first_sibling(struct trt_parent_cache ca, struct trt_tree_ctx *tc)
+{
+    struct trt_node node;
+
+    assert(tc && tc->cn);
+
+    if (troc_modi_parent(tc)) {
+        node = troc_modi_next_child(ca, tc);
+    } else if (tc->plugin_ctx.schema) {
+        tc->cn = tc->plugin_ctx.schema->ctree;
+        node = troc_read_node(ca, tc);
+    } else {
+        /* current node is top-node */
+        switch (tc->section) {
+        case TRD_SECT_MODULE:
+            tc->cn = tc->cmod->data;
+            break;
+        case TRD_SECT_RPCS:
+            tc->cn = (const struct lysc_node *)tc->cmod->rpcs;
+            break;
+        case TRD_SECT_NOTIF:
+            tc->cn = (const struct lysc_node *)tc->cmod->notifs;
+            break;
+        case TRD_SECT_PLUG_DATA:
+            /* nothing to do */
+            break;
+        default:
+            assert(0);
+        }
+        node = troc_read_node(ca, tc);
+    }
+
+    if (tc->plugin_ctx.filtered) {
+        node = troc_modi_next_sibling(ca, tc);
+    }
+
+    return node;
+}
+
+/**********************************************************************
+ * Definition of tree browsing functions
+ *********************************************************************/
+
+static uint32_t
+trb_gap_to_opts(const struct trt_node *node)
+{
+    uint32_t len = 0;
+
+    if (node->name.keys) {
+        return 0;
+    }
+
+    if (node->flags) {
+        len += strlen(node->flags);
+        /* space between flags and name */
+        len += 1;
+    } else {
+        /* space between -- and name */
+        len += 1;
+    }
+
+    switch (node->name.type) {
+    case TRD_NODE_CASE:
+        /* ':' is already counted. Plus parentheses. */
+        len += 2;
+        break;
+    case TRD_NODE_CHOICE:
+        /* Plus parentheses. */
+        len += 2;
+        break;
+    default:
+        break;
+    }
+
+    if (node->name.module_prefix) {
+        len += strlen(node->name.module_prefix);
+    }
+    if (node->name.str) {
+        len += strlen(node->name.str);
+    }
+    if (node->name.add_opts) {
+        len += strlen(node->name.add_opts);
+    }
+    if (node->name.opts) {
+        len += strlen(node->name.opts);
+    }
+
+    return len;
+}
+
+static uint32_t
+trb_gap_to_type(const struct trt_node *node)
+{
+    uint32_t len, opts_len;
+
+    if (node->name.keys) {
+        return 0;
+    }
+
+    len = trb_gap_to_opts(node);
+    /* Gap between opts and type. */
+    opts_len = 0;
+    opts_len += node->name.add_opts ? strlen(node->name.add_opts) : 0;
+    opts_len += node->name.opts ? strlen(node->name.opts) : 0;
+    if (opts_len >= TRD_INDENT_BEFORE_TYPE) {
+        /* At least one space should be there. */
+        len += 1;
+    } else if (node->name.add_opts || node->name.opts) {
+        len += TRD_INDENT_BEFORE_TYPE - opts_len;
+    } else {
+        len += TRD_INDENT_BEFORE_TYPE;
+    }
+
+    return len;
+}
+
+/**
+ * @brief Calculate the trt_indent_in_node.btw_opts_type indent size
+ * for a particular node.
+ * @param[in] node for which we get btw_opts_type.
+ * @param[in] max_gap_before_type is the maximum value of btw_opts_type
+ * that it can have.
+ * @return Indent between \<opts\> and \<type\> for node.
+ */
+static int16_t
+trb_calc_btw_opts_type(const struct trt_node *node, int16_t max_gap_before_type)
+{
+    uint32_t to_opts_len;
+
+    to_opts_len = trb_gap_to_opts(node);
+    if (to_opts_len == 0) {
+        return 1;
+    } else {
+        return max_gap_before_type - to_opts_len;
+    }
+}
+
+/**
+ * @brief Print node.
+ *
+ * This function is wrapper for ::trp_print_entire_node().
+ * But difference is that take @p max_gap_before_type which will be
+ * used to set the unified alignment.
+ *
+ * @param[in] node to print.
+ * @param[in] max_gap_before_type is number of indent before \<type\>.
+ * @param[in] wr is wrapper for printing indentation before node.
+ * @param[in] pc contains mainly functions for printing.
+ * @param[in] tc is tree context.
+ */
+static void
+trb_print_entire_node(const struct trt_node *node, uint32_t max_gap_before_type, struct trt_wrapper wr,
+        struct trt_printer_ctx *pc, struct trt_tree_ctx *tc)
+{
+    struct trt_indent_in_node ind = trp_default_indent_in_node(node);
+
+    if ((max_gap_before_type > 0) && (node->type.type != TRD_TYPE_EMPTY)) {
+        /* print actual node with unified indent */
+        ind.btw_opts_type = trb_calc_btw_opts_type(node, max_gap_before_type);
+    }
+    /* after -> print actual node with default indent */
+    trp_print_entire_node(node, TRP_INIT_PCK_PRINT(tc, pc->fp.print),
+            TRP_INIT_PCK_INDENT(wr, ind), pc->max_line_length, pc->out);
+}
+
+/**
+ * @brief Check if parent of the current node is the last
+ * of his siblings.
+ *
+ * To mantain stability use this function only if the current node is
+ * the first of the siblings.
+ * Side-effect -> current node is set to the first sibling
+ * if node has a parent otherwise no side-effect.
+ *
+ * @param[in] fp contains all @ref TRP_tro callback functions.
+ * @param[in,out] tc is tree context.
+ * @return 1 if parent is last sibling otherwise 0.
+ */
+static ly_bool
+trb_node_is_last_sibling(const struct trt_fp_all *fp, struct trt_tree_ctx *tc)
+{
+    if (fp->read.if_parent_exists(tc)) {
+        return !fp->read.if_sibling_exists(tc);
+    } else {
+        return !fp->read.if_sibling_exists(tc) && tc->plugin_ctx.last_schema;
+    }
+}
+
+/**
+ * @brief For all siblings find maximal space from '--' to \<type\>.
+ *
+ * Side-effect -> Current node is set to the first sibling.
+ *
+ * @param[in] ca contains inherited data from ancestors.
+ * @param[in] pc contains mainly functions for printing.
+ * @param[in,out] tc is tree context.
+ * @return max space.
+ */
+static uint32_t
+trb_max_gap_to_type(struct trt_parent_cache ca, struct trt_printer_ctx *pc, struct trt_tree_ctx *tc)
+{
+    struct trt_node node;
+    int32_t maxlen, len;
+
+    maxlen = 0;
+    for (node = pc->fp.modify.first_sibling(ca, tc);
+            !trp_node_is_empty(&node);
+            node = pc->fp.modify.next_sibling(ca, tc)) {
+        len = trb_gap_to_type(&node);
+        maxlen = maxlen < len ? len : maxlen;
+    }
+    pc->fp.modify.first_sibling(ca, tc);
+
+    return maxlen;
+}
+
+/**
+ * @brief Find out if it is possible to unify
+ * the alignment before \<type\>.
+ *
+ * The goal is for all node siblings to have the same alignment
+ * for \<type\> as if they were in a column. All siblings who cannot
+ * adapt because they do not fit on the line at all are ignored.
+ * Side-effect -> Current node is set to the first sibling.
+ *
+ * @param[in] ca contains inherited data from ancestors.
+ * @param[in] pc contains mainly functions for printing.
+ * @param[in,out] tc is tree context.
+ * @return positive number indicating the maximum number of spaces
+ * before \<type\> if the length of the flags, node name and opts is 0. To calculate
+ * the trt_indent_in_node.btw_opts_type indent size for a particular
+ * node, use the ::trb_calc_btw_opts_type().
+*/
+static uint32_t
+trb_try_unified_indent(struct trt_parent_cache ca, struct trt_printer_ctx *pc, struct trt_tree_ctx *tc)
+{
+    return trb_max_gap_to_type(ca, pc, tc);
+}
+
+/**
+ * @brief Check if there is no case statement
+ * under the choice statement.
+ *
+ * It can return true only if the Parsed schema tree
+ * is used for browsing.
+ *
+ * @param[in] tc is tree context.
+ * @return 1 if implicit case statement is present otherwise 0.
+ */
+static ly_bool
+trb_need_implicit_node_case(struct trt_tree_ctx *tc)
+{
+    return !tc->lysc_tree && tc->pn->parent &&
+           (tc->pn->parent->nodetype & LYS_CHOICE) &&
+           (tc->pn->nodetype & (LYS_ANYDATA | LYS_CHOICE | LYS_CONTAINER |
+           LYS_LEAF | LYS_LEAFLIST));
+}
+
+static void trb_print_subtree_nodes(struct trt_node *node, uint32_t max_gap_before_type,
+        struct trt_wrapper wr, struct trt_parent_cache ca, struct trt_printer_ctx *pc, struct trt_tree_ctx *tc);
+
+/**
+ * @brief Print implicit case node and his subtree.
+ *
+ * @param[in] node is child of implicit case.
+ * @param[in] wr is wrapper for printing identation before node.
+ * @param[in] pc contains mainly functions for printing.
+ * @param[in] tc is tree context. Its settings should be the same as
+ * before the function call.
+ * @return new indentation wrapper for @p node.
+ */
+static struct trt_wrapper
+trb_print_implicit_node(const struct trt_node *node, struct trt_wrapper wr, struct trt_printer_ctx *pc,
+        struct trt_tree_ctx *tc)
+{
+    struct trt_node case_node;
+    struct trt_wrapper wr_case_child;
+
+    tro_create_implicit_case_node(node, &case_node);
+    ly_print_(pc->out, "\n");
+    trb_print_entire_node(&case_node, 0, wr, pc, tc);
+    ly_print_(pc->out, "\n");
+    wr_case_child = pc->fp.read.if_sibling_exists(tc) ?
+            trp_wrapper_set_mark(wr) : trp_wrapper_set_shift(wr);
+    return wr_case_child;
+}
+
+/**
+ * @brief Calculate the wrapper about how deep in the tree the node is.
+ * @param[in] wr_in A wrapper to use as a starting point
+ * @param[in] node from which to count.
+ * @return wrapper for @p node.
+ */
+static struct trt_wrapper
+trb_count_depth(const struct trt_wrapper *wr_in, const struct lysc_node *node)
+{
+    struct trt_wrapper wr = wr_in ? *wr_in : TRP_INIT_WRAPPER_TOP;
+    const struct lysc_node *parent;
+
+    if (!node) {
+        return wr;
+    }
+
+    for (parent = node->parent; parent; parent = parent->parent) {
+        wr = trp_wrapper_set_shift(wr);
+    }
+
+    return wr;
+}
+
+/**
+ * @brief Print all parent nodes of @p node and the @p node itself.
+ *
+ * Side-effect -> trt_tree_ctx.cn will be set to @p node.
+ *
+ * @param[in] node on which the function is focused.
+ * @param[in] wr_in for printing identation before node.
+ * @param[in] pc is @ref TRP_trp settings.
+ * @param[in,out] tc is context of tree printer.
+ */
+static void
+trb_print_parents(const struct lysc_node *node, struct trt_wrapper *wr_in, struct trt_printer_ctx *pc, struct trt_tree_ctx *tc)
+{
+    uint32_t max_gap_before_type;
+    struct trt_wrapper wr;
+    struct trt_node print_node;
+
+    assert(pc && tc && tc->section == TRD_SECT_MODULE);
+
+    /* stop recursion */
+    if (!node) {
+        return;
+    }
+    trb_print_parents(node->parent, wr_in, pc, tc);
+
+    /* setup for printing */
+    tc->cn = node;
+    wr = trb_count_depth(wr_in, node);
+
+    /* print node */
+    ly_print_(pc->out, "\n");
+    print_node = pc->fp.read.node(TRP_EMPTY_PARENT_CACHE, tc);
+    max_gap_before_type = trb_max_gap_to_type(TRP_EMPTY_PARENT_CACHE, pc, tc);
+    trb_print_entire_node(&print_node, max_gap_before_type, wr, pc, tc);
+}
+
+/**
+ * @brief Set current node on its child.
+ * @param[in,out] tc contains current node.
+ */
+static void
+trb_tree_ctx_set_child(struct trt_tree_ctx *tc)
+{
+    const void *node = tro_tree_ctx_get_child(tc);
+
+    if (tc->lysc_tree) {
+        tc->cn = node;
+    } else {
+        tc->pn = node;
+    }
+}
+
+/**
+ * @brief Move extension iterator to the next position.
+ *
+ * @param[in] lysc_tree flag if exts is from compiled tree.
+ * @param[in] exts is current array of extensions.
+ * @param[in,out] i is state of iterator.
+ * @return Pointer to the first/next extension.
+ */
+static void *
+trb_ext_iter_next(ly_bool lysc_tree, void *exts, uint64_t *i)
+{
+    void *ext = NULL;
+    struct lysc_ext_instance *ce;
+    struct lysp_ext_instance *pe;
+
+    if (!exts) {
+        return NULL;
+    }
+
+    if (lysc_tree) {
+        ce = exts;
+        while (*i < LY_ARRAY_COUNT(ce)) {
+            if (ce->def->plugin && trp_ext_parent_is_valid(1, &ce[*i])) {
+                ext = &ce[*i];
+                break;
+            }
+            ++(*i);
+        }
+    } else {
+        pe = exts;
+        while (*i < LY_ARRAY_COUNT(pe)) {
+            if (trp_ext_parent_is_valid(0, &pe[*i])) {
+                ext = &pe[*i];
+                break;
+            }
+            ++(*i);
+        }
+    }
+    ++(*i);
+
+    return ext;
+}
+
+/**
+ * @brief Iterate over extensions in module.
+ *
+ * @param[in] tc contains current node.
+ * @param[in,out] i is state of iterator.
+ * @return First/next extension or NULL.
+ */
+static void *
+trb_mod_ext_iter(const struct trt_tree_ctx *tc, uint64_t *i)
+{
+    if (tc->lysc_tree) {
+        return trb_ext_iter_next(1, tc->cmod->exts, i);
+    } else {
+        return trb_ext_iter_next(0, tc->pmod->exts, i);
+    }
+}
+
+/**
+ * @brief Iterate over extensions in node.
+ *
+ * @param[in] tc contains current node.
+ * @param[in,out] i is state of iterator.
+ * @return First/next extension or NULL.
+ */
+static void *
+trb_ext_iter(const struct trt_tree_ctx *tc, uint64_t *i)
+{
+    if (tc->lysc_tree) {
+        return trb_ext_iter_next(1, tc->cn->exts, i);
+    } else {
+        return trb_ext_iter_next(0, tc->pn->exts, i);
+    }
+}
+
+/**
+ * @brief Initialize plugin context.
+ *
+ * @param[in] compiled if @p ext is lysc structure.
+ * @param[in] ext current processed extension.
+ * @param[out] plug_ctx is plugin context which will be initialized.
+ * @return LY_ERR value.
+ */
+static LY_ERR
+tro_ext_printer_tree(ly_bool compiled, void *ext, const struct lyspr_tree_ctx *plug_ctx)
+{
+    struct lysc_ext_instance *ext_comp;
+    struct lysp_ext_instance *ext_pars;
+    const char *flags = NULL, *add_opts = NULL;
+
+    if (compiled) {
+        ext_comp = ext;
+        return ext_comp->def->plugin->printer_ctree(ext, plug_ctx, &flags, &add_opts);
+    } else {
+        ext_pars = ext;
+        return ext_pars->record->plugin.printer_ptree(ext, plug_ctx, &flags, &add_opts);
+    }
+}
+
+/**
+ * @brief Reset tree context by plugin context.
+ *
+ * @param[in] plug_ctx is plugin context.
+ * @param[in] i which index in schemas should be used.
+ * @param[in] pc are printing functions.
+ * @param[out] tc tree context which will be updated.
+ */
+static void
+trm_reset_tree_ctx_by_plugin(struct lyspr_tree_ctx *plug_ctx, LY_ARRAY_COUNT_TYPE i, struct trt_printer_ctx *pc,
+        struct trt_tree_ctx *tc)
+{
+    tc->plugin_ctx.ctx = plug_ctx;
+    tc->pmod = NULL;
+    tc->cmod = NULL;
+    if (plug_ctx->schemas[i].compiled) {
+        tc->lysc_tree = 1;
+        tc->cn = plug_ctx->schemas[i].ctree;
+        tc->plugin_ctx.schema = &plug_ctx->schemas[i];
+        pc->fp.modify = TRP_TRT_FP_MODIFY_COMPILED;
+        pc->fp.read = TRP_TRT_FP_READ_COMPILED;
+    } else {
+        tc->lysc_tree = 0;
+        tc->pn = plug_ctx->schemas[i].ptree;
+        tc->tpn = tc->pn;
+        tc->plugin_ctx.schema = &plug_ctx->schemas[i];
+        pc->fp.modify = TRP_TRT_FP_MODIFY_PARSED;
+        pc->fp.read = TRP_TRT_FP_READ_PARSED;
+    }
+}
+
+/**
+ * @brief Print schemas from plugin context.
+ *
+ * @param[in] plug_ctx is plugin context.
+ * @param[in] last_nodes if this schemas will be the last.
+ * @param[in] max_gap_before_type is gap before type.
+ * @param[in] wr is indentation wrapper.
+ * @param[in] ca containing information from parent.
+ * @param[in] pc functions for tree traversing.
+ * @param[in] tc current tree context.
+ */
+static void
+trb_ext_print_schemas(struct lyspr_tree_ctx *plug_ctx, ly_bool last_nodes, uint32_t max_gap_before_type,
+        struct trt_wrapper wr, struct trt_parent_cache ca, struct trt_printer_ctx *pc, struct trt_tree_ctx *tc)
+{
+    LY_ARRAY_COUNT_TYPE i;
+    struct trt_printer_ctx pc_dupl;
+    struct trt_tree_ctx tc_dupl;
+    struct trt_node node;
+
+    tc_dupl = *tc;
+    pc_dupl = *pc;
+
+    LY_ARRAY_FOR(plug_ctx->schemas, i) {
+        trm_reset_tree_ctx_by_plugin(plug_ctx, i, pc, tc);
+        tc->plugin_ctx.last_schema = last_nodes && ((i + 1) == LY_ARRAY_COUNT(plug_ctx->schemas));
+        node = TRP_EMPTY_NODE;
+        trb_print_subtree_nodes(&node, max_gap_before_type, wr, ca, pc, tc);
+        *tc = tc_dupl;
+    }
+
+    *pc = pc_dupl;
+}
+
+/**
+ * @brief Count unified indentation across schemas from extension instance.
+ *
+ * @param[in] plug_ctx is plugin context.
+ * @param[in] ca containing parent settings.
+ * @param[out] max_gap_before_type is result of unified indent.
+ * @param[in] pc functions for tree traversing.
+ * @param[in] tc is tree context.
+ */
+static void
+trb_ext_try_unified_indent(struct lyspr_tree_ctx *plug_ctx, struct trt_parent_cache ca, uint32_t *max_gap_before_type,
+        struct trt_printer_ctx *pc, struct trt_tree_ctx *tc)
+{
+    LY_ARRAY_COUNT_TYPE i;
+    struct trt_printer_ctx pc_dupl;
+    struct trt_tree_ctx tc_dupl;
+    uint32_t max;
+
+    tc_dupl = *tc;
+    pc_dupl = *pc;
+
+    LY_ARRAY_FOR(plug_ctx->schemas, i) {
+        trm_reset_tree_ctx_by_plugin(plug_ctx, i, pc, tc);
+        max = trb_try_unified_indent(ca, pc, tc);
+        *max_gap_before_type = max > *max_gap_before_type ? max : *max_gap_before_type;
+        *tc = tc_dupl;
+    }
+
+    *pc = pc_dupl;
+}
+
+/**
+ * @brief For every extension instance print all schemas.
+ *
+ * @param[in] wr indentation wrapper for node.
+ * @param[in] ca parent settings.
+ * @param[in] pc function used for tree traversing.
+ * @param[in] tc tree context.
+ */
+static void
+trb_ext_print_instances(struct trt_wrapper wr, struct trt_parent_cache ca, struct trt_printer_ctx *pc,
+        struct trt_tree_ctx *tc)
+{
+    LY_ERR rc;
+    LY_ARRAY_COUNT_TYPE i;
+    uint64_t last_instance = UINT64_MAX;
+    void *ext;
+    ly_bool child_exists;
+    uint32_t max, max_gap_before_type = 0;
+
+    ca = tro_parent_cache_for_child(ca, tc);
+    /* if node is last sibling, then do not add '|' to wrapper */
+    wr = trb_node_is_last_sibling(&pc->fp, tc) ?
+            trp_wrapper_set_shift(wr) : trp_wrapper_set_mark(wr);
+
+    if (tc->lysc_tree) {
+        child_exists = tro_next_child(tc->cn, tc) ? 1 : 0;
+    } else {
+        child_exists = tro_next_child(tc->pn, tc) ? 1 : 0;
+    }
+
+    i = 0;
+    while ((ext = trb_ext_iter(tc, &i))) {
+        struct lyspr_tree_ctx plug_ctx = {0};
+
+        rc = tro_ext_printer_tree(tc->lysc_tree, ext, &plug_ctx);
+        LY_CHECK_ERR_GOTO(rc, tc->last_error = rc, end);
+        trb_ext_try_unified_indent(&plug_ctx, ca, &max_gap_before_type, pc, tc);
+        if (plug_ctx.schemas) {
+            last_instance = i;
+        }
+        trp_ext_free_plugin_ctx(&plug_ctx);
+    }
+
+    if (child_exists) {
+        pc->fp.modify.next_child(ca, tc);
+        max = trb_try_unified_indent(ca, pc, tc);
+        max_gap_before_type = max > max_gap_before_type ? max : max_gap_before_type;
+        pc->fp.modify.parent(tc);
+    }
+
+    i = 0;
+    while ((ext = trb_ext_iter(tc, &i))) {
+        struct lyspr_tree_ctx plug_ctx = {0};
+
+        rc = tro_ext_printer_tree(tc->lysc_tree, ext, &plug_ctx);
+        LY_CHECK_ERR_GOTO(rc, tc->last_error = rc, end);
+        if (!child_exists && (last_instance == i)) {
+            trb_ext_print_schemas(&plug_ctx, 1, max_gap_before_type, wr, ca, pc, tc);
+        } else {
+            trb_ext_print_schemas(&plug_ctx, 0, max_gap_before_type, wr, ca, pc, tc);
+        }
+        trp_ext_free_plugin_ctx(&plug_ctx);
+    }
+
+end:
+    return;
+}
+
+/**
+ * @brief Print subtree of nodes.
+ *
+ * The current node is expected to be the root of the subtree.
+ * Before root node is no linebreak printing. This must be addressed by
+ * the caller. Root node will also be printed. Behind last printed node
+ * is no linebreak.
+ *
+ * @param[in,out] node current processed node used as iterator.
+ * @param[in] max_gap_before_type is result from
+ * ::trb_try_unified_indent() function for root node.
+ * Set parameter to 0 if distance does not matter.
+ * @param[in] wr is wrapper saying how deep in the whole tree
+ * is the root of the subtree.
+ * @param[in] ca is parent_cache from root's parent.
+ * If root is top-level node, insert ::TRP_EMPTY_PARENT_CACHE.
+ * @param[in] pc is @ref TRP_trp settings.
+ * @param[in,out] tc is context of tree printer.
+ */
+static void
+trb_print_subtree_nodes(struct trt_node *node, uint32_t max_gap_before_type, struct trt_wrapper wr,
+        struct trt_parent_cache ca, struct trt_printer_ctx *pc, struct trt_tree_ctx *tc)
+{
+    if (!trp_node_is_empty(node)) {
+        /* Print root node. */
+        trb_print_entire_node(node, max_gap_before_type, wr, pc, tc);
+        if (trp_ext_is_present_in_node(tc)) {
+            trb_ext_print_instances(wr, ca, pc, tc);
+        }
+        /* if node is last sibling, then do not add '|' to wrapper */
+        wr = trb_node_is_last_sibling(&pc->fp, tc) ?
+                trp_wrapper_set_shift(wr) : trp_wrapper_set_mark(wr);
+        /* go to the child */
+        ca = tro_parent_cache_for_child(ca, tc);
+        *node = pc->fp.modify.next_child(ca, tc);
+        if (trp_node_is_empty(node)) {
+            return;
+        }
+        /* TODO comment browse through instances + filtered. try unified indentation for children */
+        max_gap_before_type = trb_try_unified_indent(ca, pc, tc);
+    } else {
+        /* Root node is ignored, continue with child. */
+        *node = pc->fp.modify.first_sibling(ca, tc);
+    }
+
+    do {
+        if (!tc->plugin_ctx.filtered && !trb_need_implicit_node_case(tc)) {
+            /* normal behavior */
+            ly_print_(pc->out, "\n");
+            trb_print_subtree_nodes(node, max_gap_before_type, wr, ca, pc, tc);
+        } else if (!tc->plugin_ctx.filtered) {
+            struct trt_wrapper wr_case_child;
+
+            wr_case_child = trb_print_implicit_node(node, wr, pc, tc);
+            trb_print_subtree_nodes(node, max_gap_before_type, wr_case_child, ca, pc, tc);
+        }
+        /* go to the actual node's sibling */
+        *node = pc->fp.modify.next_sibling(ca, tc);
+    } while (!trp_node_is_empty(node));
+
+    /* get back from child node to root node */
+    pc->fp.modify.parent(tc);
+}
+
+/**
+ * @brief Print all parents and their children.
+ *
+ * This function is suitable for printing top-level nodes that
+ * do not have ancestors. Function call ::trb_print_subtree_nodes()
+ * for all top-level siblings. Use this function after 'module' keyword
+ * or 'augment' and so. The nodes may not be exactly top-level in the
+ * tree, but the function considers them that way.
+ *
+ * @param[in] wr is wrapper saying how deeply the top-level nodes are
+ * immersed in the tree.
+ * @param[pc] pc contains mainly functions for printing.
+ * @param[in,out] tc is tree context.
+ */
+static void
+trb_print_family_tree(struct trt_wrapper wr, struct trt_printer_ctx *pc, struct trt_tree_ctx *tc)
+{
+    struct trt_parent_cache ca;
+    struct trt_node node;
+    uint32_t max_gap_before_type;
+
+    if (!tro_tree_ctx_get_node(tc)) {
+        return;
+    }
+
+    ca = TRP_EMPTY_PARENT_CACHE;
+    max_gap_before_type = trb_try_unified_indent(ca, pc, tc);
+
+    if (!tc->lysc_tree) {
+        if ((tc->section == TRD_SECT_GROUPING) && (tc->tpn == tc->pn->parent)) {
+            ca.lys_config = 0x0;
+        }
+    }
+
+    for (node = pc->fp.modify.first_sibling(ca, tc);
+            !trp_node_is_empty(&node);
+            node = pc->fp.modify.next_sibling(ca, tc)) {
+        ly_print_(pc->out, "\n");
+        trb_print_subtree_nodes(&node, max_gap_before_type, wr, ca, pc, tc);
+    }
+}
+
+/**********************************************************************
+ * Definition of trm main functions
+ *********************************************************************/
+
+/**
+ * @brief Settings if lysp_node are used for browsing through the tree.
+ *
+ * @param[in] module YANG schema tree structure representing
+ * YANG module.
+ * @param[in] out is output handler.
+ * @param[in] max_line_length is the maximum line length limit
+ * that should not be exceeded.
+ * @param[in,out] pc will be adapted to lysp_tree.
+ * @param[in,out] tc will be adapted to lysp_tree.
+ */
+static void
+trm_lysp_tree_ctx(const struct lys_module *module, struct ly_out *out, size_t max_line_length,
+        struct trt_printer_ctx *pc, struct trt_tree_ctx *tc)
+{
+    *tc = (struct trt_tree_ctx) {
+        .lysc_tree = 0,
+        .section = TRD_SECT_MODULE,
+        .pmod = module->parsed,
+        .cmod = NULL,
+        .pn = module->parsed ? module->parsed->data : NULL,
+        .tpn = module->parsed ? module->parsed->data : NULL,
+        .cn = NULL,
+        .last_error = 0,
+        .plugin_ctx.ctx = NULL,
+        .plugin_ctx.schema = NULL,
+        .plugin_ctx.filtered = 0,
+        .plugin_ctx.node_overr = TRP_TREE_CTX_EMPTY_NODE_OVERR,
+        .plugin_ctx.last_schema = 1,
+        .plugin_ctx.last_error = 0
+    };
+
+    pc->out = out;
+
+    pc->fp.modify = TRP_TRT_FP_MODIFY_PARSED;
+    pc->fp.read = TRP_TRT_FP_READ_PARSED;
+
+    pc->fp.print = (struct trt_fp_print) {
+        .print_features_names = tro_print_features_names,
+        .print_keys = tro_print_keys
+    };
+
+    pc->max_line_length = max_line_length;
+}
+
+/**
+ * @brief Settings if lysc_node are used for browsing through the tree.
+ *
+ * Pointers to current nodes will be set to module data.
+ *
+ * @param[in] module YANG schema tree structure representing
+ * YANG module.
+ * @param[in] out is output handler.
+ * @param[in] max_line_length is the maximum line length limit
+ * that should not be exceeded.
+ * @param[in,out] pc will be adapted to lysc_tree.
+ * @param[in,out] tc will be adapted to lysc_tree.
+ */
+static void
+trm_lysc_tree_ctx(const struct lys_module *module, struct ly_out *out, size_t max_line_length,
+        struct trt_printer_ctx *pc, struct trt_tree_ctx *tc)
+{
+    *tc = (struct trt_tree_ctx) {
+        .lysc_tree = 1,
+        .section = TRD_SECT_MODULE,
+        .pmod = module->parsed,
+        .cmod = module->compiled,
+        .tpn = NULL,
+        .pn = NULL,
+        .cn = module->compiled->data,
+        .last_error = 0,
+        .plugin_ctx.ctx = NULL,
+        .plugin_ctx.schema = NULL,
+        .plugin_ctx.filtered = 0,
+        .plugin_ctx.node_overr = TRP_TREE_CTX_EMPTY_NODE_OVERR,
+        .plugin_ctx.last_schema = 1,
+        .plugin_ctx.last_error = 0
+    };
+
+    pc->out = out;
+
+    pc->fp.modify = TRP_TRT_FP_MODIFY_COMPILED;
+    pc->fp.read = TRP_TRT_FP_READ_COMPILED;
+
+    pc->fp.print = (struct trt_fp_print) {
+        .print_features_names = tro_print_features_names,
+        .print_keys = tro_print_keys
+    };
+
+    pc->max_line_length = max_line_length;
+}
+
+/**
+ * @brief Reset settings to browsing through the lysc tree.
+ * @param[in,out] pc resets to @ref TRP_troc functions.
+ * @param[in,out] tc resets to lysc browsing.
+ */
+static void
+trm_reset_to_lysc_tree_ctx(struct trt_printer_ctx *pc, struct trt_tree_ctx *tc)
+{
+    LY_ERR erc;
+
+    erc = tc->last_error;
+    trp_ext_free_node_override(&tc->plugin_ctx.node_overr, &tc->plugin_ctx.filtered);
+    trm_lysc_tree_ctx(tc->pmod->mod, pc->out, pc->max_line_length, pc, tc);
+    tc->last_error = erc;
+}
+
+/**
+ * @brief Reset settings to browsing through the lysp tree.
+ * @param[in,out] pc resets to @ref TRP_trop functions.
+ * @param[in,out] tc resets to lysp browsing.
+ */
+static void
+trm_reset_to_lysp_tree_ctx(struct trt_printer_ctx *pc, struct trt_tree_ctx *tc)
+{
+    LY_ERR erc;
+
+    erc = tc->last_error;
+    trp_ext_free_node_override(&tc->plugin_ctx.node_overr, &tc->plugin_ctx.filtered);
+    trm_lysp_tree_ctx(tc->pmod->mod, pc->out, pc->max_line_length, pc, tc);
+    tc->last_error = erc;
+}
+
+/**
+ * @brief If augment's target node is located on the current module.
+ * @param[in] pn is examined augment.
+ * @param[in] pmod is current module.
+ * @return 1 if nodeid refers to the local node, otherwise 0.
+ */
+static ly_bool
+trm_nodeid_target_is_local(const struct lysp_node_augment *pn, const struct lysp_module *pmod)
+{
+    const char *id, *prefix, *name;
+    size_t prefix_len, name_len;
+    const struct lys_module *mod;
+    ly_bool ret = 0;
+
+    if (pn == NULL) {
+        return ret;
+    }
+
+    id = pn->nodeid;
+    if (!id) {
+        return ret;
+    }
+    /* only absolute-schema-nodeid is taken into account */
+    assert(id[0] == '/');
+    ++id;
+
+    ly_parse_nodeid(&id, &prefix, &prefix_len, &name, &name_len);
+    if (prefix) {
+        mod = ly_resolve_prefix(pmod->mod->ctx, prefix, prefix_len, LY_VALUE_SCHEMA, pmod);
+        ret = mod ? (mod->parsed == pmod) : 0;
+    } else {
+        ret = 1;
+    }
+
+    return ret;
+}
+
+/**
+ * @brief Printing section module, rpcs, notifications or yang-data.
+ *
+ * First node must be the first child of 'module',
+ * 'rpcs', 'notifications' or 'yang-data'.
+ *
+ * @param[in] ks is section representation.
+ * @param[in] pc contains mainly functions for printing.
+ * @param[in,out] tc is the tree context.
+ */
+static void
+trm_print_section_as_family_tree(struct trt_keyword_stmt ks, struct trt_printer_ctx *pc, struct trt_tree_ctx *tc)
+{
+    assert(ks.section_name);
+
+    trp_print_keyword_stmt(ks, pc->max_line_length, pc->out);
+    if (!strcmp(ks.section_name, TRD_KEYWORD_MODULE) || !strcmp(ks.section_name, TRD_KEYWORD_SUBMODULE)) {
+        trb_print_family_tree(TRP_INIT_WRAPPER_TOP, pc, tc);
+    } else {
+        trb_print_family_tree(TRP_INIT_WRAPPER_BODY, pc, tc);
+    }
+}
+
+/**
+ * @brief Printing section augment or grouping.
+ *
+ * First node is 'augment' or 'grouping' itself.
+ *
+ * @param[in] ks is section representation.
+ * @param[in] pc contains mainly functions for printing.
+ * @param[in,out] tc is the tree context.
+ */
+static void
+trm_print_section_as_subtree(struct trt_keyword_stmt ks, struct trt_printer_ctx *pc, struct trt_tree_ctx *tc)
+{
+    assert(ks.section_name);
+    trp_print_keyword_stmt(ks, pc->max_line_length, pc->out);
+    trb_tree_ctx_set_child(tc);
+    trb_print_family_tree(TRP_INIT_WRAPPER_BODY, pc, tc);
+}
+
+/**
+ * @brief Print 'module' keyword, its name and all nodes.
+ * @param[in] pc contains mainly functions for printing.
+ * @param[in,out] tc is the tree context.
+ */
+static void
+trm_print_module_section(struct trt_printer_ctx *pc, struct trt_tree_ctx *tc)
+{
+    trm_print_section_as_family_tree(pc->fp.read.module_name(tc), pc, tc);
+}
+
+/**
+ * @brief For all augment sections: print 'augment' keyword,
+ * its target node and all nodes.
+ * @param[in] pc contains mainly functions for printing.
+ * @param[in,out] tc is the tree context.
+ */
+static void
+trm_print_augmentations(struct trt_printer_ctx *pc, struct trt_tree_ctx *tc)
+{
+    ly_bool once;
+    ly_bool origin_was_lysc_tree = 0;
+    struct trt_keyword_stmt ks;
+
+    if (tc->lysc_tree) {
+        origin_was_lysc_tree = 1;
+        trm_reset_to_lysp_tree_ctx(pc, tc);
+    }
+
+    once = 1;
+    for (ks = trop_modi_next_augment(tc); ks.section_name; ks = trop_modi_next_augment(tc)) {
+
+        if (origin_was_lysc_tree) {
+            /* if lysc tree is used, then only augments targeting
+             * another module are printed
+             */
+            if (trm_nodeid_target_is_local((const struct lysp_node_augment *)tc->tpn, tc->pmod)) {
+                continue;
+            }
+        }
+
+        if (once) {
+            ly_print_(pc->out, "\n");
+            ly_print_(pc->out, "\n");
+            once = 0;
+        } else {
+            ly_print_(pc->out, "\n");
+        }
+
+        trm_print_section_as_subtree(ks, pc, tc);
+    }
+
+    if (origin_was_lysc_tree) {
+        trm_reset_to_lysc_tree_ctx(pc, tc);
+    }
+}
+
+/**
+ * @brief For rpcs section: print 'rpcs' keyword and all its nodes.
+ * @param[in] pc contains mainly functions for printing.
+ * @param[in,out] tc is the tree context.
+ */
+static void
+trm_print_rpcs(struct trt_printer_ctx *pc, struct trt_tree_ctx *tc)
+{
+    struct trt_keyword_stmt rpc;
+
+    rpc = tro_modi_get_rpcs(tc);
+
+    if (rpc.section_name) {
+        ly_print_(pc->out, "\n");
+        ly_print_(pc->out, "\n");
+        trm_print_section_as_family_tree(rpc, pc, tc);
+    }
+}
+
+/**
+ * @brief For notifications section: print 'notifications' keyword
+ * and all its nodes.
+ * @param[in] pc contains mainly functions for printing.
+ * @param[in,out] tc is the tree context.
+ */
+static void
+trm_print_notifications(struct trt_printer_ctx *pc, struct trt_tree_ctx *tc)
+{
+    struct trt_keyword_stmt notifs;
+
+    notifs = tro_modi_get_notifications(tc);
+
+    if (notifs.section_name) {
+        ly_print_(pc->out, "\n");
+        ly_print_(pc->out, "\n");
+        trm_print_section_as_family_tree(notifs, pc, tc);
+    }
+}
+
+/**
+ * @brief For all grouping sections: print 'grouping' keyword, its name
+ * and all nodes.
+ * @param[in] pc contains mainly functions for printing.
+ * @param[in,out] tc is the tree context.
+ */
+static void
+trm_print_groupings(struct trt_printer_ctx *pc, struct trt_tree_ctx *tc)
+{
+    ly_bool once;
+    struct trt_keyword_stmt ks;
+
+    if (tc->lysc_tree) {
+        return;
+    }
+
+    once = 1;
+    for (ks = trop_modi_next_grouping(tc); ks.section_name; ks = trop_modi_next_grouping(tc)) {
+        if (once) {
+            ly_print_(pc->out, "\n");
+            ly_print_(pc->out, "\n");
+            once = 0;
+        } else {
+            ly_print_(pc->out, "\n");
+        }
+        trm_print_section_as_subtree(ks, pc, tc);
+    }
+}
+
+/**
+ * @brief Print all sections defined in plugins.
+ *
+ * @param[in] pc contains mainly functions for printing.
+ * @param[in,out] tc is the tree context.
+ */
+static void
+trm_print_plugin_ext(struct trt_printer_ctx *pc, struct trt_tree_ctx *tc)
+{
+    LY_ERR rc;
+    ly_bool once;
+    LY_ARRAY_COUNT_TYPE i = 0, j;
+    struct trt_keyword_stmt ks, prev_ks = {0};
+    struct trt_printer_ctx pc_dupl;
+    struct trt_tree_ctx tc_dupl;
+    struct trt_node node;
+    uint32_t max_gap_before_type;
+    void *ext;
+
+    tc->section = TRD_SECT_PLUG_DATA;
+
+    tc_dupl = *tc;
+    pc_dupl = *pc;
+
+    once = 1;
+
+    while ((ext = trb_mod_ext_iter(tc, &i))) {
+        struct lyspr_tree_ctx plug_ctx = {0};
+
+        rc = tro_ext_printer_tree(tc->lysc_tree, ext, &plug_ctx);
+        LY_CHECK_ERR_GOTO(rc, tc->last_error = rc, end);
+        if (!plug_ctx.schemas) {
+            continue;
+        }
+
+        ks = tro_get_ext_section(tc, ext, &plug_ctx);
+        if (once || (prev_ks.section_name && strcmp(prev_ks.section_name, ks.section_name))) {
+            ly_print_(pc->out, "\n");
+            ly_print_(pc->out, "\n");
+            once = 0;
+        } else {
+            ly_print_(pc->out, "\n");
+        }
+        trp_print_keyword_stmt(ks, pc->max_line_length, pc->out);
+
+        max_gap_before_type = 0;
+        trb_ext_try_unified_indent(&plug_ctx, TRP_EMPTY_PARENT_CACHE, &max_gap_before_type, pc, tc);
+        LY_ARRAY_FOR(plug_ctx.schemas, j) {
+            trm_reset_tree_ctx_by_plugin(&plug_ctx, j, pc, tc);
+            node = TRP_EMPTY_NODE;
+            trb_print_subtree_nodes(&node, max_gap_before_type, TRP_INIT_WRAPPER_BODY, TRP_EMPTY_PARENT_CACHE, pc, tc);
+        }
+
+        *tc = tc_dupl;
+        trp_ext_free_plugin_ctx(&plug_ctx);
+        prev_ks = ks;
+    }
+
+end:
+    *pc = pc_dupl;
+    return;
+}
+
+/**
+ * @brief Print sections module, augment, rpcs, notifications,
+ * grouping, yang-data.
+ * @param[in] pc contains mainly functions for printing.
+ * @param[in,out] tc is the tree context.
+ */
+static void
+trm_print_sections(struct trt_printer_ctx *pc, struct trt_tree_ctx *tc)
+{
+    trm_print_module_section(pc, tc);
+    trm_print_augmentations(pc, tc);
+    trm_print_rpcs(pc, tc);
+    trm_print_notifications(pc, tc);
+    trm_print_groupings(pc, tc);
+    trm_print_plugin_ext(pc, tc);
+    ly_print_(pc->out, "\n");
+}
+
+static LY_ERR
+tree_print_check_error(struct ly_out_clb_arg *out, struct trt_tree_ctx *tc)
+{
+    if (out->last_error) {
+        return out->last_error;
+    } else if (tc->last_error) {
+        return tc->last_error;
+    } else {
+        return LY_SUCCESS;
+    }
+}
+
+/**********************************************************************
+ * Definition of module interface
+ *********************************************************************/
+
+LY_ERR
+tree_print_module(struct ly_out *out, const struct lys_module *module, uint32_t UNUSED(options), size_t line_length)
+{
+    struct trt_printer_ctx pc;
+    struct trt_tree_ctx tc;
+    struct ly_out *new_out;
+    LY_ERR erc;
+    struct ly_out_clb_arg clb_arg = TRP_INIT_LY_OUT_CLB_ARG(TRD_PRINT, out, 0, LY_SUCCESS);
+
+    LY_CHECK_ARG_RET3(module->ctx, out, module, module->parsed, LY_EINVAL);
+
+    if ((erc = ly_out_new_clb(&trp_ly_out_clb_func, &clb_arg, &new_out))) {
+        return erc;
+    }
+
+    line_length = line_length == 0 ? SIZE_MAX : line_length;
+    if ((module->ctx->flags & LY_CTX_SET_PRIV_PARSED) && module->compiled) {
+        trm_lysc_tree_ctx(module, new_out, line_length, &pc, &tc);
+    } else {
+        trm_lysp_tree_ctx(module, new_out, line_length, &pc, &tc);
+    }
+
+    trm_print_sections(&pc, &tc);
+    erc = tree_print_check_error(&clb_arg, &tc);
+
+    ly_out_free(new_out, NULL, 1);
+
+    return erc;
+}
+
+LY_ERR
+tree_print_compiled_node(struct ly_out *out, const struct lysc_node *node, uint32_t options, size_t line_length)
+{
+    struct trt_printer_ctx pc;
+    struct trt_tree_ctx tc;
+    struct ly_out *new_out;
+    struct trt_wrapper wr;
+    LY_ERR erc;
+    struct ly_out_clb_arg clb_arg = TRP_INIT_LY_OUT_CLB_ARG(TRD_PRINT, out, 0, LY_SUCCESS);
+
+    assert(out && node);
+
+    if (!(node->module->ctx->flags & LY_CTX_SET_PRIV_PARSED)) {
+        return LY_EINVAL;
+    }
+
+    if ((erc = ly_out_new_clb(&trp_ly_out_clb_func, &clb_arg, &new_out))) {
+        return erc;
+    }
+
+    line_length = line_length == 0 ? SIZE_MAX : line_length;
+    trm_lysc_tree_ctx(node->module, new_out, line_length, &pc, &tc);
+
+    trp_print_keyword_stmt(pc.fp.read.module_name(&tc), pc.max_line_length, pc.out);
+    trb_print_parents(node, NULL, &pc, &tc);
+
+    if (!(options & LYS_PRINT_NO_SUBSTMT)) {
+        tc.cn = lysc_node_child(node);
+        wr = trb_count_depth(NULL, tc.cn);
+        trb_print_family_tree(wr, &pc, &tc);
+    }
+    ly_print_(out, "\n");
+
+    erc = tree_print_check_error(&clb_arg, &tc);
+    ly_out_free(new_out, NULL, 1);
+
+    return erc;
+}
+
+LY_ERR
+tree_print_parsed_submodule(struct ly_out *out, const struct lysp_submodule *submodp, uint32_t UNUSED(options),
+        size_t line_length)
+{
+    struct trt_printer_ctx pc;
+    struct trt_tree_ctx tc;
+    struct ly_out *new_out;
+    LY_ERR erc;
+    struct ly_out_clb_arg clb_arg = TRP_INIT_LY_OUT_CLB_ARG(TRD_PRINT, out, 0, LY_SUCCESS);
+
+    assert(submodp);
+    LY_CHECK_ARG_RET(submodp->mod->ctx, out, LY_EINVAL);
+
+    if ((erc = ly_out_new_clb(&trp_ly_out_clb_func, &clb_arg, &new_out))) {
+        return erc;
+    }
+
+    line_length = line_length == 0 ? SIZE_MAX : line_length;
+    trm_lysp_tree_ctx(submodp->mod, new_out, line_length, &pc, &tc);
+    tc.pmod = (struct lysp_module *)submodp;
+    tc.tpn = submodp->data;
+    tc.pn = tc.tpn;
+
+    trm_print_sections(&pc, &tc);
+    erc = tree_print_check_error(&clb_arg, &tc);
+
+    ly_out_free(new_out, NULL, 1);
+
+    return erc;
+}