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144 lines
4.2 KiB
C++
144 lines
4.2 KiB
C++
/**
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* Copyright (c) 2014-2019, Timothy Stack
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of Timothy Stack nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TIMOTHY STACK AND CONTRIBUTORS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @file json_ptr.hh
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*/
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#ifndef json_ptr_hh
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#define json_ptr_hh
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#include <string>
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#include <vector>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include "base/auto_mem.hh"
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#include "yajl/api/yajl_parse.h"
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#include "yajl/api/yajl_tree.h"
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class json_ptr_walk {
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public:
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const static yajl_callbacks callbacks;
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json_ptr_walk()
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{
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this->jpw_handle = yajl_alloc(&callbacks, nullptr, this);
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}
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yajl_status parse(const char* buffer, ssize_t len);
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yajl_status complete_parse();
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void update_error_msg(yajl_status status, const char* buffer, ssize_t len);
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void clear() { this->jpw_values.clear(); }
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void inc_array_index()
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{
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if (!this->jpw_array_indexes.empty()
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&& this->jpw_array_indexes.back() != -1)
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{
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this->jpw_array_indexes.back() += 1;
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}
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}
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std::string current_ptr();
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struct walk_triple {
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walk_triple(std::string ptr, yajl_type type, std::string value)
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: wt_ptr(std::move(ptr)), wt_type(type), wt_value(std::move(value))
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{
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}
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std::string wt_ptr;
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yajl_type wt_type;
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std::string wt_value;
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};
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using walk_list_t = std::vector<walk_triple>;
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auto_mem<yajl_handle_t> jpw_handle{yajl_free};
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std::string jpw_error_msg;
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walk_list_t jpw_values;
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std::vector<std::string> jpw_keys;
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std::vector<int32_t> jpw_array_indexes;
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size_t jpw_max_ptr_len{0};
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};
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class json_ptr {
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public:
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enum class match_state_t {
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DONE,
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VALUE,
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ERR_INVALID_TYPE,
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ERR_NO_SLASH,
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ERR_INVALID_ESCAPE,
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ERR_INVALID_INDEX,
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};
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static size_t encode(char* dst,
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size_t dst_len,
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const char* src,
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size_t src_len = -1);
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static std::string encode_str(const char* src, size_t src_len = -1);
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static std::string encode_str(const std::string& src)
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{
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return encode_str(src.c_str(), src.size());
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}
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static size_t decode(char* dst, const char* src, ssize_t src_len = -1);
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json_ptr(const char* value) : jp_value(value), jp_pos(value) {}
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bool expect_map(int32_t& depth, int32_t& index);
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bool at_key(int32_t depth, const char* component, ssize_t len = -1);
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void exit_container(int32_t& depth, int32_t& index);
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bool expect_array(int32_t& depth, int32_t& index);
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bool at_index(int32_t& depth, int32_t& index, bool primitive = true);
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bool reached_end() const { return this->jp_pos[0] == '\0'; }
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std::string error_msg() const;
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const char* jp_value;
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const char* jp_pos;
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int32_t jp_depth{0};
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int32_t jp_array_index{-1};
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match_state_t jp_state{match_state_t::VALUE};
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};
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#endif
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