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/* JSON trees
Copyright (C) 2017-2023 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_H
#define GCC_JSON_H
/* Implementation of JSON, a lightweight data-interchange format.
See http://www.json.org/
and http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-404.pdf
and https://tools.ietf.org/html/rfc7159
Supports creating a DOM-like tree of json::value *, and then dumping
json::value * to text. */
namespace json
{
/* Forward decls of json::value and its subclasses (using indentation
to denote inheritance. */
class value;
class object;
class array;
class float_number;
class integer_number;
class string;
class literal;
/* An enum for discriminating the subclasses of json::value. */
enum kind
{
/* class json::object. */
JSON_OBJECT,
/* class json::array. */
JSON_ARRAY,
/* class json::integer_number. */
JSON_INTEGER,
/* class json::float_number. */
JSON_FLOAT,
/* class json::string. */
JSON_STRING,
/* class json::literal uses these three values to identify the
particular literal. */
JSON_TRUE,
JSON_FALSE,
JSON_NULL
};
/* Base class of JSON value. */
class value
{
public:
virtual ~value () {}
virtual enum kind get_kind () const = 0;
virtual void print (pretty_printer *pp) const = 0;
void dump (FILE *) const;
};
/* Subclass of value for objects: a collection of key/value pairs
preserving the ordering in which keys were inserted.
Preserving the order eliminates non-determinism in the output,
making it easier for the user to compare repeated invocations. */
class object : public value
{
public:
~object ();
enum kind get_kind () const final override { return JSON_OBJECT; }
void print (pretty_printer *pp) const final override;
void set (const char *key, value *v);
value *get (const char *key) const;
private:
typedef hash_map <char *, value *,
simple_hashmap_traits<nofree_string_hash, value *> > map_t;
map_t m_map;
/* Keep track of order in which keys were inserted. */
auto_vec <const char *> m_keys;
};
/* Subclass of value for arrays. */
class array : public value
{
public:
~array ();
enum kind get_kind () const final override { return JSON_ARRAY; }
void print (pretty_printer *pp) const final override;
void append (value *v);
private:
auto_vec<value *> m_elements;
};
/* Subclass of value for floating-point numbers. */
class float_number : public value
{
public:
float_number (double value) : m_value (value) {}
enum kind get_kind () const final override { return JSON_FLOAT; }
void print (pretty_printer *pp) const final override;
double get () const { return m_value; }
private:
double m_value;
};
/* Subclass of value for integer-valued numbers. */
class integer_number : public value
{
public:
integer_number (long value) : m_value (value) {}
enum kind get_kind () const final override { return JSON_INTEGER; }
void print (pretty_printer *pp) const final override;
long get () const { return m_value; }
private:
long m_value;
};
/* Subclass of value for strings. */
class string : public value
{
public:
explicit string (const char *utf8);
string (const char *utf8, size_t len);
~string () { free (m_utf8); }
enum kind get_kind () const final override { return JSON_STRING; }
void print (pretty_printer *pp) const final override;
const char *get_string () const { return m_utf8; }
size_t get_length () const { return m_len; }
private:
char *m_utf8;
size_t m_len;
};
/* Subclass of value for the three JSON literals "true", "false",
and "null". */
class literal : public value
{
public:
literal (enum kind kind) : m_kind (kind) {}
/* Construct literal for a boolean value. */
literal (bool value): m_kind (value ? JSON_TRUE : JSON_FALSE) {}
enum kind get_kind () const final override { return m_kind; }
void print (pretty_printer *pp) const final override;
private:
enum kind m_kind;
};
} // namespace json
#endif /* GCC_JSON_H */
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