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/* JSON parsing
Copyright (C) 2017-2022 Free Software Foundation, Inc.
Contributed by David Malcolm <dmalcolm@redhat.com>.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef GCC_JSON_PARSING_H
#define GCC_JSON_PARSING_H
#include "json.h"
namespace json
{
/* Declarations for parsing JSON to a json::value * tree. */
/* Abstract base class for recording what the locations of JSON values
were as they parsed. */
class location_map
{
public:
/* A point within the JSON input file. */
struct point
{
size_t m_unichar_idx; /* zero-based. */
int m_line; /* one-based. */
int m_column; /* zero-based unichar count. */
};
/* A range of points within the JSON input file.
Both endpoints are part of the range. */
struct range
{
point m_start;
point m_end;
};
virtual ~location_map () {}
virtual void record_range_for_value (json::value *jv, const range &r) = 0;
virtual void on_finished_parsing () {}
};
/* Class for recording an error within a JSON file. */
class error
{
public:
error (const location_map::range &r, char *msg)
: m_range (r), m_msg (msg)
{
}
~error ()
{
free (m_msg);
}
const location_map::range &get_range () const { return m_range; }
const char *get_msg () const { return m_msg; }
private:
location_map::range m_range;
char *m_msg;
};
/* Class for the result of an operation: either a value or an error
(or both null for the case of "successful nullptr").
The types must be default-constructible. */
template <typename ValueType, typename ErrorType>
struct result
{
result (ValueType val) : m_val (std::move (val)), m_err () {}
result (ErrorType err) : m_val (), m_err (std::move (err)) {}
ValueType m_val;
ErrorType m_err;
};
/* Typedef for the result of parsing JSON: ownership of either a
json::value * or of a json::error *. */
typedef result<std::unique_ptr<value>,
std::unique_ptr<error>> parser_result_t;
/* Functions for parsing JSON buffers. */
extern parser_result_t
parse_utf8_string (size_t length,
const char *utf8_buf,
bool allow_comments,
location_map *out_loc_map);
extern parser_result_t
parse_utf8_string (const char *utf8,
bool allow_comments,
location_map *out_loc_map);
} // namespace json
#endif /* GCC_JSON_PARSING_H */
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