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| -rw-r--r-- | src/yajlpp/yajlpp.hh | 682 |
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diff --git a/src/yajlpp/yajlpp.hh b/src/yajlpp/yajlpp.hh new file mode 100644 index 0000000..7632329 --- /dev/null +++ b/src/yajlpp/yajlpp.hh @@ -0,0 +1,682 @@ +/** + * Copyright (c) 2013-2019, Timothy Stack + * + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * * Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * * Neither the name of Timothy Stack nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * @file yajlpp.hh + */ + +#ifndef yajlpp_hh +#define yajlpp_hh + +#include <functional> +#include <map> +#include <memory> +#include <set> +#include <stack> +#include <string> +#include <utility> +#include <vector> + +#include <limits.h> +#include <stdarg.h> +#include <string.h> + +#include "base/file_range.hh" +#include "base/intern_string.hh" +#include "base/lnav.console.hh" +#include "base/lnav.console.into.hh" +#include "base/lnav_log.hh" +#include "base/opt_util.hh" +#include "json_ptr.hh" +#include "optional.hpp" +#include "pcrepp/pcre2pp.hh" +#include "relative_time.hh" +#include "yajl/api/yajl_gen.h" +#include "yajl/api/yajl_parse.h" + +inline yajl_gen_status +yajl_gen_pstring(yajl_gen hand, const char* str, size_t len) +{ + if (len == (size_t) -1) { + len = strlen(str); + } + return yajl_gen_string(hand, (const unsigned char*) str, len); +} + +inline yajl_gen_status +yajl_gen_string(yajl_gen hand, const std::string& str) +{ + return yajl_gen_string( + hand, (const unsigned char*) str.c_str(), str.length()); +} + +yajl_gen_status yajl_gen_tree(yajl_gen hand, yajl_val val); + +void yajl_cleanup_tree(yajl_val val); + +template<typename T> +struct positioned_property { + intern_string_t pp_path; + source_location pp_location; + T pp_value; + + lnav::console::snippet to_snippet() const + { + return lnav::console::snippet::from(this->pp_location, ""); + } +}; + +template<typename T, typename... Types> +struct factory_container : public positioned_property<std::shared_ptr<T>> { + template<Types... DefaultArgs> + struct with_default_args : public positioned_property<std::shared_ptr<T>> { + template<typename... Args> + static Result<with_default_args, lnav::console::user_message> from( + intern_string_t src, source_location loc, Args... args) + { + auto from_res = T::from(args..., DefaultArgs...); + + if (from_res.isOk()) { + with_default_args retval; + + retval.pp_path = src; + retval.pp_location = loc; + retval.pp_value = from_res.unwrap().to_shared(); + return Ok(retval); + } + + return Err( + lnav::console::to_user_message(src, from_res.unwrapErr())); + } + }; + + template<typename... Args> + static Result<factory_container, lnav::console::user_message> from( + intern_string_t src, source_location loc, Args... args) + { + auto from_res = T::from(args...); + + if (from_res.isOk()) { + factory_container retval; + + retval.pp_path = src; + retval.pp_location = loc; + retval.pp_value = from_res.unwrap().to_shared(); + return Ok(retval); + } + + return Err(lnav::console::to_user_message(src, from_res.unwrapErr())); + } +}; + +class yajlpp_gen_context; +class yajlpp_parse_context; + +struct yajlpp_provider_context { + lnav::pcre2pp::match_data* ypc_extractor; + size_t ypc_index{0}; + yajlpp_parse_context* ypc_parse_context; + + static constexpr size_t nindex = static_cast<size_t>(-1); + + template<typename T> + intern_string_t get_substr_i(T&& name) const + { + auto cap = (*this->ypc_extractor)[std::forward<T>(name)].value(); + char path[cap.length() + 1]; + size_t len = json_ptr::decode(path, cap.data(), cap.length()); + + return intern_string::lookup(path, len); + } + + template<typename T> + std::string get_substr(T&& name) const + { + auto cap = (*this->ypc_extractor)[std::forward<T>(name)].value(); + char path[cap.length() + 1]; + size_t len = json_ptr::decode(path, cap.data(), cap.length()); + + return {path, len}; + } +}; + +class yajlpp_error : public std::exception { +public: + yajlpp_error(yajl_handle handle, const char* json, size_t len) noexcept + { + auto_mem<unsigned char> yajl_msg; + + yajl_msg = yajl_get_error( + handle, 1, reinterpret_cast<const unsigned char*>(json), len); + this->ye_msg = reinterpret_cast<const char*>(yajl_msg.in()); + } + + const char* what() const noexcept override { return this->ye_msg.c_str(); } + +private: + std::string ye_msg; +}; + +struct json_path_container; + +struct json_path_handler_base { + struct enum_value_t { + template<typename T> + enum_value_t(const char* name, T value) + : first(name), second((unsigned int) value) + { + } + + const char* first; + int second; + }; + + static const enum_value_t ENUM_TERMINATOR; + + explicit json_path_handler_base(const std::string& property); + + explicit json_path_handler_base( + const std::shared_ptr<const lnav::pcre2pp::code>& property_re); + + json_path_handler_base( + std::string property, + const std::shared_ptr<const lnav::pcre2pp::code>& property_re); + + bool is_array() const { return this->jph_is_array; } + + nonstd::optional<int> to_enum_value(const string_fragment& sf) const; + const char* to_enum_string(int value) const; + + template<typename T> + std::enable_if_t<!detail::is_optional<T>::value, const char*> + to_enum_string(T value) const + { + return this->to_enum_string((int) value); + } + + template<typename T> + std::enable_if_t<detail::is_optional<T>::value, const char*> to_enum_string( + T value) const + { + return this->to_enum_string((int) value.value()); + } + + yajl_gen_status gen(yajlpp_gen_context& ygc, yajl_gen handle) const; + yajl_gen_status gen_schema(yajlpp_gen_context& ygc) const; + yajl_gen_status gen_schema_type(yajlpp_gen_context& ygc) const; + void walk( + const std::function< + void(const json_path_handler_base&, const std::string&, void*)>& cb, + void* root = nullptr, + const std::string& base = "/") const; + + enum class schema_type_t : std::uint32_t { + ANY, + BOOLEAN, + INTEGER, + NUMBER, + STRING, + ARRAY, + OBJECT, + }; + + std::vector<schema_type_t> get_types() const; + + std::string jph_property; + std::shared_ptr<const lnav::pcre2pp::code> jph_regex; + yajl_callbacks jph_callbacks{}; + std::function<yajl_gen_status( + yajlpp_gen_context&, const json_path_handler_base&, yajl_gen)> + jph_gen_callback; + std::function<void(yajlpp_parse_context& ypc, + const json_path_handler_base& jph)> + jph_validator; + std::function<void*(void* root, nonstd::optional<std::string> name)> + jph_field_getter; + std::function<void*(const yajlpp_provider_context& pe, void* root)> + jph_obj_provider; + std::function<void(void* root, std::vector<std::string>& paths_out)> + jph_path_provider; + std::function<void(const yajlpp_provider_context& pe, void* root)> + jph_obj_deleter; + std::function<size_t(void* root)> jph_size_provider; + const char* jph_synopsis{""}; + const char* jph_description{""}; + const json_path_container* jph_children{nullptr}; + std::shared_ptr<const lnav::pcre2pp::code> jph_pattern; + const char* jph_pattern_re{nullptr}; + std::function<void(const string_fragment&)> jph_string_validator; + size_t jph_min_length{0}; + size_t jph_max_length{INT_MAX}; + const enum_value_t* jph_enum_values{nullptr}; + long long jph_min_value{LLONG_MIN}; + bool jph_optional_wrapper{false}; + bool jph_is_array; + bool jph_is_pattern_property{false}; + std::vector<std::string> jph_examples; + + std::function<int(yajlpp_parse_context*)> jph_null_cb; + std::function<int(yajlpp_parse_context*, int)> jph_bool_cb; + std::function<int(yajlpp_parse_context*, long long)> jph_integer_cb; + std::function<int(yajlpp_parse_context*, double)> jph_double_cb; + std::function<int( + yajlpp_parse_context*, const unsigned char* str, size_t len)> + jph_str_cb; + + void validate_string(yajlpp_parse_context& ypc, string_fragment sf) const; + + void report_pattern_error(yajlpp_parse_context* ypc, + const std::string& value_str) const; + void report_min_value_error(yajlpp_parse_context* ypc, + long long value) const; + void report_duration_error(yajlpp_parse_context* ypc, + const std::string& value_str, + const relative_time::parse_error& pe) const; + void report_enum_error(yajlpp_parse_context* ypc, + const std::string& value_str) const; + void report_error(yajlpp_parse_context* ypc, + const std::string& value_str, + lnav::console::user_message um) const; + + attr_line_t get_help_text(const std::string& full_path) const; + attr_line_t get_help_text(yajlpp_parse_context* ypc) const; +}; + +struct json_path_handler; + +class yajlpp_parse_context { +public: + using error_reporter_t = std::function<void( + const yajlpp_parse_context& ypc, const lnav::console::user_message&)>; + + yajlpp_parse_context(intern_string_t source, + const struct json_path_container* handlers = nullptr); + + const char* get_path_fragment(int offset, + char* frag_in, + size_t& len_out) const; + + intern_string_t get_path_fragment_i(int offset) const + { + char fragbuf[this->ypc_path.size()]; + const char* frag; + size_t len; + + frag = this->get_path_fragment(offset, fragbuf, len); + return intern_string::lookup(frag, len); + } + + std::string get_path_fragment(int offset) const + { + char fragbuf[this->ypc_path.size()]; + const char* frag; + size_t len; + + frag = this->get_path_fragment(offset, fragbuf, len); + return std::string(frag, len); + } + + const intern_string_t get_path() const; + + const intern_string_t get_full_path() const; + + bool is_level(size_t level) const + { + return this->ypc_path_index_stack.size() == level; + } + + yajlpp_parse_context& set_path(const std::string& path); + + void reset(const struct json_path_container* handlers); + + void set_static_handler(const struct json_path_handler_base& jph); + + template<typename T> + yajlpp_parse_context& with_obj(T& obj) + { + this->ypc_obj_stack.push(&obj); + return *this; + } + + yajlpp_parse_context& with_handle(yajl_handle handle) + { + this->ypc_handle = handle; + return *this; + } + + yajlpp_parse_context& with_error_reporter(error_reporter_t err) + { + this->ypc_error_reporter = err; + return *this; + } + + yajlpp_parse_context& with_ignore_unused(bool ignore) + { + this->ypc_ignore_unused = ignore; + return *this; + } + + yajl_status parse(const unsigned char* jsonText, size_t jsonTextLen); + + yajl_status parse(const string_fragment& sf) + { + return this->parse((const unsigned char*) sf.data(), sf.length()); + } + + int get_line_number() const; + + yajl_status complete_parse(); + + bool parse_doc(const string_fragment& sf); + + void report_error(const lnav::console::user_message& msg) const + { + if (this->ypc_error_reporter) { + this->ypc_error_reporter(*this, msg); + } + } + + lnav::console::snippet get_snippet() const; + + template<typename T> + std::vector<T>& get_lvalue(std::map<std::string, std::vector<T>>& value) + { + return value[this->get_path_fragment(-2)]; + } + + template<typename T> + T& get_lvalue(std::map<std::string, T>& value) + { + return value[this->get_path_fragment(-1)]; + } + + template<typename T> + T& get_lvalue(T& lvalue) + { + return lvalue; + } + + template<typename T> + T& get_rvalue(std::map<std::string, std::vector<T>>& value) + { + return value[this->get_path_fragment(-2)].back(); + } + + template<typename T> + T& get_rvalue(std::map<std::string, T>& value) + { + return value[this->get_path_fragment(-1)]; + } + + template<typename T> + T& get_rvalue(std::vector<T>& value) + { + return value.back(); + } + + template<typename T> + T& get_rvalue(T& lvalue) + { + return lvalue; + } + + template<typename T, typename MEM_T, MEM_T T::*MEM> + auto& get_obj_member() + { + auto obj = (T*) this->ypc_obj_stack.top(); + + return obj->*MEM; + } + + const intern_string_t ypc_source; + int ypc_line_number{1}; + const struct json_path_container* ypc_handlers; + std::stack<void*> ypc_obj_stack; + void* ypc_userdata{nullptr}; + yajl_handle ypc_handle{nullptr}; + const unsigned char* ypc_json_text{nullptr}; + size_t ypc_json_text_len{0}; + size_t ypc_total_consumed{0}; + yajl_callbacks ypc_callbacks; + yajl_callbacks ypc_alt_callbacks; + std::vector<char> ypc_path; + std::vector<size_t> ypc_path_index_stack; + std::vector<size_t> ypc_array_index; + std::vector<const json_path_handler_base*> ypc_handler_stack; + size_t ypc_array_handler_count{0}; + bool ypc_ignore_unused{false}; + const struct json_path_container* ypc_sibling_handlers{nullptr}; + const struct json_path_handler_base* ypc_current_handler{nullptr}; + std::set<std::string> ypc_active_paths; + error_reporter_t ypc_error_reporter{nullptr}; + std::map<intern_string_t, source_location>* ypc_locations{nullptr}; + + void update_callbacks(const json_path_container* handlers = nullptr, + int child_start = 0); + +private: + static const yajl_callbacks DEFAULT_CALLBACKS; + + static int map_start(void* ctx); + static int map_key(void* ctx, const unsigned char* key, size_t len); + static int map_end(void* ctx); + static int array_start(void* ctx); + static int array_end(void* ctx); + static int handle_unused(void* ctx); + static int handle_unused_or_delete(void* ctx); +}; + +class yajlpp_generator { +public: + yajlpp_generator(yajl_gen handle) : yg_handle(handle) {} + + yajl_gen_status operator()(const std::string& str) + { + return yajl_gen_string(this->yg_handle, str); + } + + yajl_gen_status operator()(const char* str) + { + return yajl_gen_string( + this->yg_handle, (const unsigned char*) str, strlen(str)); + } + + yajl_gen_status operator()(const char* str, size_t len) + { + return yajl_gen_string( + this->yg_handle, (const unsigned char*) str, len); + } + + yajl_gen_status operator()(const intern_string_t& str) + { + return yajl_gen_string( + this->yg_handle, (const unsigned char*) str.get(), str.size()); + } + + yajl_gen_status operator()(const string_fragment& str) + { + return yajl_gen_string( + this->yg_handle, (const unsigned char*) str.data(), str.length()); + } + + yajl_gen_status operator()(bool value) + { + return yajl_gen_bool(this->yg_handle, value); + } + + yajl_gen_status operator()(double value) + { + return yajl_gen_double(this->yg_handle, value); + } + + template<typename T> + yajl_gen_status operator()( + T value, + typename std::enable_if<std::is_integral<T>::value + && !std::is_same<T, bool>::value>::type* dummy + = 0) + { + return yajl_gen_integer(this->yg_handle, value); + } + + template<typename T> + yajl_gen_status operator()(nonstd::optional<T> value) + { + if (!value.has_value()) { + return yajl_gen_status_ok; + } + + return (*this)(value.value()); + } + + template<typename T> + yajl_gen_status operator()( + const T& container, + typename std::enable_if<!std::is_integral<T>::value>::type* dummy = 0) + { + yajl_gen_array_open(this->yg_handle); + for (const auto& elem : container) { + yajl_gen_status rc = (*this)(elem); + + if (rc != yajl_gen_status_ok) { + return rc; + } + } + + yajl_gen_array_close(this->yg_handle); + + return yajl_gen_status_ok; + } + + yajl_gen_status operator()() { return yajl_gen_null(this->yg_handle); } + +private: + yajl_gen yg_handle; +}; + +class yajlpp_container_base { +public: + yajlpp_container_base(yajl_gen handle) : gen(handle), ycb_handle(handle) {} + + yajlpp_generator gen; + +protected: + yajl_gen ycb_handle; +}; + +class yajlpp_map : public yajlpp_container_base { +public: + yajlpp_map(yajl_gen handle) : yajlpp_container_base(handle) + { + yajl_gen_map_open(handle); + } + + ~yajlpp_map() { yajl_gen_map_close(this->ycb_handle); } +}; + +class yajlpp_array : public yajlpp_container_base { +public: + yajlpp_array(yajl_gen handle) : yajlpp_container_base(handle) + { + yajl_gen_array_open(handle); + } + + ~yajlpp_array() { yajl_gen_array_close(this->ycb_handle); } +}; + +class yajlpp_gen_context { +public: + yajlpp_gen_context(yajl_gen handle, + const struct json_path_container& handlers) + : ygc_handle(handle), ygc_depth(0), ygc_handlers(&handlers) + { + } + + template<typename T> + yajlpp_gen_context& with_default_obj(T& obj) + { + this->ygc_default_stack.push(&obj); + return *this; + } + + template<typename T> + yajlpp_gen_context& with_obj(const T& obj) + { + this->ygc_obj_stack.push((void*) &obj); + return *this; + } + + yajlpp_gen_context& with_context(yajlpp_parse_context& ypc); + + void gen(); + + void gen_schema(const json_path_container* handlers = nullptr); + + yajl_gen ygc_handle; + int ygc_depth; + std::stack<void*> ygc_default_stack; + std::stack<void*> ygc_obj_stack; + std::vector<std::string> ygc_path; + const json_path_container* ygc_handlers; + std::map<std::string, const json_path_container*> ygc_schema_definitions; +}; + +class yajlpp_gen { +public: + yajlpp_gen() : yg_handle(yajl_gen_free) + { + this->yg_handle = yajl_gen_alloc(nullptr); + } + + yajl_gen get_handle() const { return this->yg_handle.in(); } + + operator yajl_gen() { return this->yg_handle.in(); } + + string_fragment to_string_fragment(); + +private: + auto_mem<yajl_gen_t> yg_handle; +}; + +struct json_string { + explicit json_string(yajl_gen_t* gen) + { + const unsigned char* buf; + + yajl_gen_get_buf(gen, &buf, &this->js_len); + + this->js_content = (const unsigned char*) malloc(this->js_len); + memcpy((void*) this->js_content.in(), buf, this->js_len); + } + + auto_mem<const unsigned char> js_content; + size_t js_len{0}; +}; + +void dump_schema_to(const json_path_container& jpc, const char* internals_dir); + +#endif |