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/**************************************************************************/
/* variant_parser.h */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/**************************************************************************/
#ifndef VARIANT_PARSER_H
#define VARIANT_PARSER_H
#include "core/os/file_access.h"
#include "core/resource.h"
#include "core/variant.h"
class VariantParser {
public:
struct Stream {
private:
enum { READAHEAD_SIZE = 2048 };
CharType readahead_buffer[READAHEAD_SIZE];
uint32_t readahead_pointer = 0;
uint32_t readahead_filled = 0;
bool eof = false;
protected:
bool readahead_enabled = true;
virtual uint32_t _read_buffer(CharType *p_buffer, uint32_t p_num_chars) = 0;
virtual bool _is_eof() const = 0;
public:
CharType saved;
CharType get_char();
virtual bool is_utf8() const = 0;
bool is_eof() const;
Stream() :
saved(0) {}
virtual ~Stream() {}
};
struct StreamFile : public Stream {
protected:
virtual uint32_t _read_buffer(CharType *p_buffer, uint32_t p_num_chars);
virtual bool _is_eof() const;
public:
FileAccess *f;
virtual bool is_utf8() const;
StreamFile(bool p_readahead_enabled = true) {
f = nullptr;
readahead_enabled = p_readahead_enabled;
}
};
struct StreamString : public Stream {
private:
int pos;
protected:
virtual uint32_t _read_buffer(CharType *p_buffer, uint32_t p_num_chars);
virtual bool _is_eof() const;
public:
String s;
virtual bool is_utf8() const;
StreamString(bool p_readahead_enabled = true) {
pos = 0;
readahead_enabled = p_readahead_enabled;
}
};
typedef Error (*ParseResourceFunc)(void *p_self, Stream *p_stream, Ref<Resource> &r_res, int &line, String &r_err_str);
struct ResourceParser {
void *userdata = nullptr;
ParseResourceFunc func = nullptr;
ParseResourceFunc ext_func = nullptr;
ParseResourceFunc sub_func = nullptr;
};
enum TokenType {
TK_CURLY_BRACKET_OPEN,
TK_CURLY_BRACKET_CLOSE,
TK_BRACKET_OPEN,
TK_BRACKET_CLOSE,
TK_PARENTHESIS_OPEN,
TK_PARENTHESIS_CLOSE,
TK_IDENTIFIER,
TK_STRING,
TK_NUMBER,
TK_COLOR,
TK_COLON,
TK_COMMA,
TK_PERIOD,
TK_EQUAL,
TK_EOF,
TK_ERROR,
TK_MAX
};
enum Expecting {
EXPECT_OBJECT,
EXPECT_OBJECT_KEY,
EXPECT_COLON,
EXPECT_OBJECT_VALUE,
};
struct Token {
TokenType type;
Variant value;
};
struct Tag {
String name;
Map<String, Variant> fields;
};
private:
static const char *tk_name[TK_MAX];
template <class T>
static Error _parse_construct(Stream *p_stream, Vector<T> &r_construct, int &line, String &r_err_str);
static Error _parse_enginecfg(Stream *p_stream, Vector<String> &strings, int &line, String &r_err_str);
static Error _parse_dictionary(Dictionary &object, Stream *p_stream, int &line, String &r_err_str, ResourceParser *p_res_parser = nullptr);
static Error _parse_array(Array &array, Stream *p_stream, int &line, String &r_err_str, ResourceParser *p_res_parser = nullptr);
static Error _parse_tag(Token &token, Stream *p_stream, int &line, String &r_err_str, Tag &r_tag, ResourceParser *p_res_parser = nullptr, bool p_simple_tag = false);
public:
static Error parse_tag(Stream *p_stream, int &line, String &r_err_str, Tag &r_tag, ResourceParser *p_res_parser = nullptr, bool p_simple_tag = false);
static Error parse_tag_assign_eof(Stream *p_stream, int &line, String &r_err_str, Tag &r_tag, String &r_assign, Variant &r_value, ResourceParser *p_res_parser = nullptr, bool p_simple_tag = false);
static Error parse_value(Token &token, Variant &value, Stream *p_stream, int &line, String &r_err_str, ResourceParser *p_res_parser = nullptr);
static Error get_token(Stream *p_stream, Token &r_token, int &line, String &r_err_str);
static Error parse(Stream *p_stream, Variant &r_ret, String &r_err_str, int &r_err_line, ResourceParser *p_res_parser = nullptr);
};
class VariantWriter {
public:
typedef Error (*StoreStringFunc)(void *ud, const String &p_string);
typedef String (*EncodeResourceFunc)(void *ud, const RES &p_resource);
static Error write(const Variant &p_variant, StoreStringFunc p_store_string_func, void *p_store_string_ud, EncodeResourceFunc p_encode_res_func, void *p_encode_res_ud, int p_recursion_count = 0);
static Error write_to_string(const Variant &p_variant, String &r_string, EncodeResourceFunc p_encode_res_func = nullptr, void *p_encode_res_ud = nullptr);
};
#endif // VARIANT_PARSER_H
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