virtualx-engine/modules/fbx/fbx_parser/FBXTokenizer.h

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/*  FBXTokenizer.h                                                       */
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/** @file  FBXTokenizer.h
 *  @brief FBX lexer
 */
#ifndef FBX_TOKENIZER_H
#define FBX_TOKENIZER_H

#include "FBXParseTools.h"
#include "core/string/ustring.h"
#include <iostream>
#include <memory>
#include <string>
#include <vector>

namespace FBXDocParser {
/** Rough classification for text FBX tokens used for constructing the
 *  basic scope hierarchy. */
enum TokenType {
	// {
	TokenType_OPEN_BRACKET = 0,

	// }
	TokenType_CLOSE_BRACKET,

	// '"blablubb"', '2', '*14' - very general token class,
	// further processing happens at a later stage.
	TokenType_DATA,

	//
	TokenType_BINARY_DATA,

	// ,
	TokenType_COMMA,

	// blubb:
	TokenType_KEY
};

/** Represents a single token in a FBX file. Tokens are
 *  classified by the #TokenType enumerated types.
 *
 *  Offers iterator protocol. Tokens are immutable. */
class Token {
private:
	static const unsigned int BINARY_MARKER = static_cast<unsigned int>(-1);

public:
	/** construct a textual token */
	Token(const char *p_sbegin, const char *p_send, TokenType p_type, unsigned int p_line, unsigned int p_column);

	/** construct a binary token */
	Token(const char *p_sbegin, const char *p_send, TokenType p_type, size_t p_offset);
	~Token();

public:
	std::string StringContents() const {
		return std::string(begin(), end());
	}

	bool IsBinary() const {
		return column == BINARY_MARKER;
	}

	const char *begin() const {
		return sbegin;
	}

	const char *end() const {
		return send;
	}

	TokenType Type() const {
		return type;
	}

	size_t Offset() const {
		return offset;
	}

	unsigned int Line() const {
		return static_cast<unsigned int>(line);
	}

	unsigned int Column() const {
		return column;
	}

private:
#ifdef DEBUG_ENABLED
	// full string copy for the sole purpose that it nicely appears
	// in msvc's debugger window.
	std::string contents;
#endif

	const char *sbegin = nullptr;
	const char *send = nullptr;
	const TokenType type;

	union {
		size_t line;
		size_t offset;
	};
	const unsigned int column = 0;
};

// Fixed leak by using shared_ptr for tokens
typedef Token *TokenPtr;
typedef std::vector<TokenPtr> TokenList;

#define new_Token new Token

/** Main FBX tokenizer function. Transform input buffer into a list of preprocessed tokens.
 *
 *  Skips over comments and generates line and column numbers.
 *
 * @param output_tokens Receives a list of all tokens in the input data.
 * @param input_buffer Textual input buffer to be processed, 0-terminated.
 * @print_error if something goes wrong */
void Tokenize(TokenList &output_tokens, const char *input, size_t length);

/** Tokenizer function for binary FBX files.
 *
 *  Emits a token list suitable for direct parsing.
 *
 * @param output_tokens Receives a list of all tokens in the input data.
 * @param input_buffer Binary input buffer to be processed.
 * @param length Length of input buffer, in bytes. There is no 0-terminal.
 * @print_error if something goes wrong */
void TokenizeBinary(TokenList &output_tokens, const char *input, size_t length);
} // namespace FBXDocParser

#endif // FBX_TOKENIZER_H