virtualx-engine/core/io/json.h

/*************************************************************************/
/*  json.h                                                               */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
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/*************************************************************************/

#ifndef JSON_H
#define JSON_H

#include "core/object/ref_counted.h"
#include "core/variant/variant.h"

class JSON : public RefCounted {
	GDCLASS(JSON, RefCounted);

	enum TokenType {
		TK_CURLY_BRACKET_OPEN,
		TK_CURLY_BRACKET_CLOSE,
		TK_BRACKET_OPEN,
		TK_BRACKET_CLOSE,
		TK_IDENTIFIER,
		TK_STRING,
		TK_NUMBER,
		TK_COLON,
		TK_COMMA,
		TK_EOF,
		TK_MAX
	};

	enum Expecting {
		EXPECT_OBJECT,
		EXPECT_OBJECT_KEY,
		EXPECT_COLON,
		EXPECT_OBJECT_VALUE,
	};

	struct Token {
		TokenType type;
		Variant value;
	};

	Variant data;
	String err_str;
	int err_line = 0;

	static const char *tk_name[];

	static String _make_indent(const String &p_indent, int p_size);
	static String _stringify(const Variant &p_var, const String &p_indent, int p_cur_indent, bool p_sort_keys, Set<const void *> &p_markers, bool p_full_precision = false);
	static Error _get_token(const char32_t *p_str, int &index, int p_len, Token &r_token, int &line, String &r_err_str);
	static Error _parse_value(Variant &value, Token &token, const char32_t *p_str, int &index, int p_len, int &line, String &r_err_str);
	static Error _parse_array(Array &array, const char32_t *p_str, int &index, int p_len, int &line, String &r_err_str);
	static Error _parse_object(Dictionary &object, const char32_t *p_str, int &index, int p_len, int &line, String &r_err_str);
	static Error _parse_string(const String &p_json, Variant &r_ret, String &r_err_str, int &r_err_line);

protected:
	static void _bind_methods();

public:
	String stringify(const Variant &p_var, const String &p_indent = "", bool p_sort_keys = true, bool p_full_precision = false);
	Error parse(const String &p_json_string);

	inline Variant get_data() const { return data; }
	inline int get_error_line() const { return err_line; }
	inline String get_error_message() const { return err_str; }
};

#endif // JSON_H