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/**
* Copyright (c) 2014-2019, 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 TIMOTHY STACK 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 json_ptr.hh
*/
#ifndef json_ptr_hh
#define json_ptr_hh
#include <string>
#include <vector>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include "base/auto_mem.hh"
#include "yajl/api/yajl_parse.h"
#include "yajl/api/yajl_tree.h"
class json_ptr_walk {
public:
const static yajl_callbacks callbacks;
json_ptr_walk()
{
this->jpw_handle = yajl_alloc(&callbacks, nullptr, this);
}
yajl_status parse(const char* buffer, ssize_t len);
yajl_status complete_parse();
void update_error_msg(yajl_status status, const char* buffer, ssize_t len);
void clear() { this->jpw_values.clear(); }
void inc_array_index()
{
if (!this->jpw_array_indexes.empty()
&& this->jpw_array_indexes.back() != -1) {
this->jpw_array_indexes.back() += 1;
}
}
std::string current_ptr();
struct walk_triple {
walk_triple(std::string ptr, yajl_type type, std::string value)
: wt_ptr(std::move(ptr)), wt_type(type), wt_value(std::move(value))
{
}
std::string wt_ptr;
yajl_type wt_type;
std::string wt_value;
};
using walk_list_t = std::vector<walk_triple>;
auto_mem<yajl_handle_t> jpw_handle{yajl_free};
std::string jpw_error_msg;
walk_list_t jpw_values;
std::vector<std::string> jpw_keys;
std::vector<int32_t> jpw_array_indexes;
size_t jpw_max_ptr_len{0};
};
class json_ptr {
public:
enum class match_state_t {
DONE,
VALUE,
ERR_INVALID_TYPE,
ERR_NO_SLASH,
ERR_INVALID_ESCAPE,
ERR_INVALID_INDEX,
};
static size_t encode(char* dst,
size_t dst_len,
const char* src,
size_t src_len = -1);
static size_t decode(char* dst, const char* src, ssize_t src_len = -1);
json_ptr(const char* value) : jp_value(value), jp_pos(value) {}
bool expect_map(int32_t& depth, int32_t& index);
bool at_key(int32_t depth, const char* component, ssize_t len = -1);
void exit_container(int32_t& depth, int32_t& index);
bool expect_array(int32_t& depth, int32_t& index);
bool at_index(int32_t& depth, int32_t& index, bool primitive = true);
bool reached_end() const { return this->jp_pos[0] == '\0'; }
std::string error_msg() const;
const char* jp_value;
const char* jp_pos;
int32_t jp_depth{0};
int32_t jp_array_index{-1};
match_state_t jp_state{match_state_t::VALUE};
};
#endif
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