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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#ifndef INCLUDED_ORCUS_THREADED_JSON_PARSER_HPP
#define INCLUDED_ORCUS_THREADED_JSON_PARSER_HPP
#include "json_parser_thread.hpp"
#include "json_parser_base.hpp"
#include "detail/thread.hpp"
#include <algorithm>
namespace orcus {
template<typename _Handler>
class threaded_json_parser
{
public:
typedef _Handler handler_type;
/**
* Constructor.
*
* @param p pointer to a string stream containing JSON string.
* @param n size of the stream.
* @param hdl handler class instance.
* @param min_token_size minimum size of the internal token buffer.
*/
threaded_json_parser(
const char* p, size_t n, handler_type& hdl, size_t min_token_size);
/**
* Constructor.
*
* @param p pointer to a string stream containing JSON string.
* @param n size of the stream.
* @param hdl handler class instance.
* @param min_token_size minimum size of the internal token buffer.
* @param max_token_size maximum size of the internal token buffer.
*/
threaded_json_parser(
const char* p, size_t n, handler_type& hdl, size_t min_token_size,
size_t max_token_size);
/**
* Call this method to start parsing.
*/
void parse();
/**
* Get statistics on the parsing session. Call this only after the
* parsing has finished.
*
* @return structure containing statistics of the parsing session.
*/
json::parser_stats get_stats() const;
void swap_string_pool(string_pool& pool);
private:
void thread_parse();
void process_tokens(json::parse_tokens_t& tokens);
private:
json::parser_thread m_parser_thread;
handler_type& m_handler;
};
template<typename _Handler>
threaded_json_parser<_Handler>::threaded_json_parser(
const char* p, size_t n, handler_type& hdl, size_t min_token_size) :
m_parser_thread(p, n, min_token_size), m_handler(hdl) {}
template<typename _Handler>
threaded_json_parser<_Handler>::threaded_json_parser(
const char* p, size_t n, handler_type& hdl, size_t min_token_size, size_t max_token_size) :
m_parser_thread(p, n, min_token_size, max_token_size), m_handler(hdl) {}
template<typename _Handler>
void threaded_json_parser<_Handler>::parse()
{
std::thread t(&threaded_json_parser::thread_parse, this);
detail::thread::scoped_guard guard(std::move(t));
json::parse_tokens_t tokens;
while (m_parser_thread.next_tokens(tokens))
process_tokens(tokens);
process_tokens(tokens);
}
template<typename _Handler>
json::parser_stats threaded_json_parser<_Handler>::get_stats() const
{
return m_parser_thread.get_stats();
}
template<typename _Handler>
void threaded_json_parser<_Handler>::swap_string_pool(string_pool& pool)
{
m_parser_thread.swap_string_pool(pool);
}
template<typename _Handler>
void threaded_json_parser<_Handler>::thread_parse()
{
// Start parsing.
m_parser_thread.start();
}
template<typename _Handler>
void threaded_json_parser<_Handler>::process_tokens(json::parse_tokens_t& tokens)
{
std::for_each(tokens.begin(), tokens.end(),
[this](const json::parse_token& t)
{
switch (t.type)
{
case json::parse_token_t::begin_array:
m_handler.begin_array();
break;
case json::parse_token_t::begin_object:
m_handler.begin_object();
break;
case json::parse_token_t::begin_parse:
m_handler.begin_parse();
break;
case json::parse_token_t::boolean_false:
m_handler.boolean_false();
break;
case json::parse_token_t::boolean_true:
m_handler.boolean_true();
break;
case json::parse_token_t::end_array:
m_handler.end_array();
break;
case json::parse_token_t::end_object:
m_handler.end_object();
break;
case json::parse_token_t::end_parse:
m_handler.end_parse();
break;
case json::parse_token_t::null:
m_handler.null();
break;
case json::parse_token_t::number:
m_handler.number(std::get<double>(t.value));
break;
case json::parse_token_t::object_key:
{
auto s = std::get<std::string_view>(t.value);
m_handler.object_key(s.data(), s.size(), false);
break;
}
case json::parse_token_t::string:
{
auto s = std::get<std::string_view>(t.value);
m_handler.string(s.data(), s.size(), false);
break;
}
case json::parse_token_t::parse_error:
{
auto v = std::get<parse_error_value_t>(t.value);
throw parse_error(std::string{v.str}, v.offset);
}
case json::parse_token_t::unknown:
default:
throw general_error("unknown token type encountered.");
}
}
);
}
}
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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