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+/**
+ * @file printer_schema.h
+ * @author Radek Krejci <rkrejci@cesnet.cz>
+ * @author Michal Vasko <mvasko@cesnet.cz>
+ * @brief Schema printers for libyang
+ *
+ * Copyright (c) 2015-2022 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
+ */
+
+#ifndef LY_PRINTER_SCHEMA_H_
+#define LY_PRINTER_SCHEMA_H_
+
+#include <stdint.h>
+#include <stdio.h>
+
+#include "log.h"
+#include "out.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct ly_out;
+struct lys_module;
+struct lysc_node;
+struct lysp_submodule;
+
+/**
+ * @page howtoSchemaPrinters Module Printers
+ *
+ * Schema printers allows to serialize internal representations of a schema module in a specific format. libyang
+ * supports the following schema formats for printing:
+ *
+ * - YANG
+ *
+ *   Basic YANG schemas format described in [RFC 6020](http://tools.ietf.org/html/rfc6020) and
+ *   [RFC 7951](http://tools.ietf.org/html/rfc7951) (so both YANG 1.0 and YANG 1.1 versions are supported).
+ *
+ * - YANG compiled
+ *
+ *   Syntactically, this format is based on standard YANG format. In contrast to standard YANG format, YANG compiled format
+ *   represents the module how it is used by libyang - with all uses expanded, augments and deviations applied, etc.
+ *   (more details about the compiled modules can be found on @ref howtoContext page).
+ *
+ * - YIN
+ *
+ *   Alternative XML-based format to YANG - YANG Independent Notation. The details can be found in
+ *   [RFC 6020](http://tools.ietf.org/html/rfc6020#section-11) and
+ *   [RFC 7951](http://tools.ietf.org/html/rfc7951#section-13).
+ *
+ * - Tree Diagram
+ *
+ *   Simple tree diagram providing overview of the module. The details can be found in
+ *   [RFC 8340](https://tools.ietf.org/html/rfc8340).
+ *
+ * For simpler transition from libyang 1.x (and for some simple use cases), there are functions (::lys_print_clb(),
+ * ::lys_print_fd(), ::lys_print_file() and ::lys_print_mem()) to print the complete module into the specified output. But note,
+ * that these functions are limited to print only the complete module.
+ *
+ * The full functionality of the schema printers is available via functions using [output handler](@ref howtoOutput). Besides
+ * the ::lys_print_module() function to print the complete module, there are functions to print a submodule
+ * (::lys_print_submodule()) or a subtree (::lys_print_node()). Note that these functions might not support all the output
+ * formats mentioned above.
+ *
+ * Functions List
+ * --------------
+ * - ::lys_print_module()
+ * - ::lys_print_submodule()
+ * - ::lys_print_node()
+ *
+ * - ::lys_print_clb()
+ * - ::lys_print_fd()
+ * - ::lys_print_file()
+ * - ::lys_print_mem()
+ * - ::lys_print_path()
+ */
+
+/**
+ * @addtogroup schematree
+ * @{
+ */
+
+/**
+ * @defgroup schemaprinterflags Schema output options
+ *
+ * Options to change default behavior of the schema printers.
+ *
+ * @{
+ */
+#define LYS_PRINT_SHRINK             LY_PRINT_SHRINK /**< Flag for output without indentation and formatting new lines. */
+#define LYS_PRINT_NO_SUBSTMT         0x10            /**< Print only top-level/referede node information,
+                                                          do not print information from the substatements */
+
+/** @} schemaprinterflags */
+
+/**
+ * @brief Schema output formats accepted by libyang [printer functions](@ref howtoSchemaPrinters).
+ */
+typedef enum {
+    LYS_OUT_UNKNOWN = 0, /**< unknown format, used as return value in case of error */
+    LYS_OUT_YANG = 1,    /**< YANG schema output format */
+    LYS_OUT_YANG_COMPILED = 2, /**< YANG schema output format of the compiled schema tree */
+    LYS_OUT_YIN = 3,     /**< YIN schema output format */
+    LYS_OUT_TREE         /**< Tree schema output format */
+} LYS_OUTFORMAT;
+
+/**
+ * @brief Schema module printer.
+ *
+ * @param[in] out Printer handler for a specific output. Use ly_out_*() functions to create and free the handler.
+ * @param[in] module Main module with the parsed schema to print.
+ * @param[in] format Output format.
+ * @param[in] line_length Maximum characters to be printed on a line, 0 for unlimited. Only for #LYS_OUT_TREE printer.
+ * @param[in] options Schema output options (see @ref schemaprinterflags).
+ * @return LY_ERR value.
+ */
+LIBYANG_API_DECL LY_ERR lys_print_module(struct ly_out *out, const struct lys_module *module, LYS_OUTFORMAT format,
+        size_t line_length, uint32_t options);
+
+/**
+ * @brief Schema submodule printer.
+ *
+ * @param[in] out Printer handler for a specific output. Use ly_out_*() functions to create and free the handler.
+ * @param[in] submodule Parsed submodule to print.
+ * @param[in] format Output format (LYS_OUT_YANG_COMPILED is not supported).
+ * @param[in] line_length Maximum characters to be printed on a line, 0 for unlimited. Only for #LYS_OUT_TREE printer.
+ * @param[in] options Schema output options (see @ref schemaprinterflags).
+ * @return LY_ERR value.
+ */
+LIBYANG_API_DECL LY_ERR lys_print_submodule(struct ly_out *out, const struct lysp_submodule *submodule, LYS_OUTFORMAT format,
+        size_t line_length, uint32_t options);
+
+/**
+ * @brief Print schema tree in the specified format into a memory block.
+ * It is up to caller to free the returned string by free().
+ *
+ * This is just a wrapper around ::lys_print_module() for simple use cases.
+ * In case of a complex use cases, use lys_print with ly_out output handler.
+ *
+ * @param[out] strp Pointer to store the resulting dump.
+ * @param[in] module Schema tree to print.
+ * @param[in] format Schema output format.
+ * @param[in] options Schema output options (see @ref schemaprinterflags).
+ * @return LY_ERR value.
+ */
+LIBYANG_API_DECL LY_ERR lys_print_mem(char **strp, const struct lys_module *module, LYS_OUTFORMAT format, uint32_t options);
+
+/**
+ * @brief Print schema tree in the specified format into a file descriptor.
+ *
+ * This is just a wrapper around ::lys_print_module() for simple use cases.
+ * In case of a complex use cases, use lys_print with ly_out output handler.
+ *
+ * @param[in] fd File descriptor where to print the data.
+ * @param[in] module Schema tree to print.
+ * @param[in] format Schema output format.
+ * @param[in] options Schema output options (see @ref schemaprinterflags).
+ * @return LY_ERR value.
+ */
+LIBYANG_API_DECL LY_ERR lys_print_fd(int fd, const struct lys_module *module, LYS_OUTFORMAT format, uint32_t options);
+
+/**
+ * @brief Print schema tree in the specified format into a file stream.
+ *
+ * This is just a wrapper around ::lys_print_module() for simple use cases.
+ * In case of a complex use cases, use lys_print with ly_out output handler.
+ *
+ * @param[in] module Schema tree to print.
+ * @param[in] f File stream where to print the schema.
+ * @param[in] format Schema output format.
+ * @param[in] options Schema output options (see @ref schemaprinterflags).
+ * @return LY_ERR value.
+ */
+LIBYANG_API_DECL LY_ERR lys_print_file(FILE *f, const struct lys_module *module, LYS_OUTFORMAT format, uint32_t options);
+
+/**
+ * @brief Print schema tree in the specified format into a file.
+ *
+ * This is just a wrapper around ::lys_print_module() for simple use cases.
+ * In case of a complex use cases, use lys_print with ly_out output handler.
+ *
+ * @param[in] path File where to print the schema.
+ * @param[in] module Schema tree to print.
+ * @param[in] format Schema output format.
+ * @param[in] options Schema output options (see @ref schemaprinterflags).
+ * @return LY_ERR value.
+ */
+LIBYANG_API_DECL LY_ERR lys_print_path(const char *path, const struct lys_module *module, LYS_OUTFORMAT format,
+        uint32_t options);
+
+/**
+ * @brief Print schema tree in the specified format using a provided callback.
+ *
+ * This is just a wrapper around ::lys_print_module() for simple use cases.
+ * In case of a complex use cases, use lys_print with ly_out output handler.
+ *
+ * @param[in] module Schema tree to print.
+ * @param[in] writeclb Callback function to write the data (see write(1)).
+ * @param[in] user_data Optional caller-specific argument to be passed to the \p writeclb callback.
+ * @param[in] format Schema output format.
+ * @param[in] options Schema output options (see @ref schemaprinterflags).
+ * @return LY_ERR value.
+ */
+LIBYANG_API_DECL LY_ERR lys_print_clb(ly_write_clb writeclb, void *user_data, const struct lys_module *module,
+        LYS_OUTFORMAT format, uint32_t options);
+
+/**
+ * @brief Schema node printer.
+ *
+ * @param[in] out Printer handler for a specific output. Use ly_out_*() functions to create and free the handler.
+ * @param[in] node Schema node to print.
+ * @param[in] format Output format.
+ * @param[in] line_length Maximum characters to be printed on a line, 0 for unlimited. Only for #LYS_OUT_TREE printer.
+ * @param[in] options Schema output options (see @ref schemaprinterflags).
+ * @return LY_ERR value.
+ */
+LIBYANG_API_DECL LY_ERR lys_print_node(struct ly_out *out, const struct lysc_node *node, LYS_OUTFORMAT format,
+        size_t line_length, uint32_t options);
+
+/** @} schematree */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LY_PRINTER_SCHEMA_H_ */