pandemonium_engine/modules/fbx/fbx_parser/FBXTokenizer.cpp

/*************************************************************************/
/*  FBXTokenizer.cpp                                                     */
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/*
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  following disclaimer.

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/** @file  FBXTokenizer.cpp
 *  @brief Implementation of the FBX broadphase lexer
 */

// tab width for logging columns
#define ASSIMP_FBX_TAB_WIDTH 4

#include "FBXTokenizer.h"
#include "core/print_string.h"

namespace FBXDocParser {

// ------------------------------------------------------------------------------------------------
Token::Token(const char *p_sbegin, const char *p_send, TokenType p_type, unsigned int p_line, unsigned int p_column) :
		sbegin(p_sbegin),
		send(p_send),
		type(p_type),
		line(p_line),
		column(p_column) {
#ifdef DEBUG_ENABLED
	contents = std::string(sbegin, static_cast<size_t>(send - sbegin));
#endif
}

// ------------------------------------------------------------------------------------------------
Token::~Token() {
}

namespace {

// ------------------------------------------------------------------------------------------------
void TokenizeError(const std::string &message, unsigned int line, unsigned int column) {
	print_error("[FBX-Tokenize]" + String(message.c_str()) + " " + itos(line) + ":" + itos(column));
}

// process a potential data token up to 'cur', adding it to 'output_tokens'.
// ------------------------------------------------------------------------------------------------
void ProcessDataToken(TokenList &output_tokens, const char *&start, const char *&end,
		unsigned int line,
		unsigned int column,
		TokenType type = TokenType_DATA,
		bool must_have_token = false) {
	if (start && end) {
		// sanity check:
		// tokens should have no whitespace outside quoted text and [start,end] should
		// properly delimit the valid range.
		bool in_double_quotes = false;
		for (const char *c = start; c != end + 1; ++c) {
			if (*c == '\"') {
				in_double_quotes = !in_double_quotes;
			}

			if (!in_double_quotes && IsSpaceOrNewLine(*c)) {
				TokenizeError("unexpected whitespace in token", line, column);
			}
		}

		if (in_double_quotes) {
			TokenizeError("non-terminated double quotes", line, column);
		}

		output_tokens.push_back(new_Token(start, end + 1, type, line, column));
	} else if (must_have_token) {
		TokenizeError("unexpected character, expected data token", line, column);
	}

	start = end = nullptr;
}

} // namespace

// ------------------------------------------------------------------------------------------------
void Tokenize(TokenList &output_tokens, const char *input, size_t length) {
	// line and column numbers numbers are one-based
	unsigned int line = 1;
	unsigned int column = 1;

	bool comment = false;
	bool in_double_quotes = false;
	bool pending_data_token = false;

	const char *token_begin = nullptr, *token_end = nullptr;

	// input (starting string), *cur the current string, column +=
	// modified to fix strlen() and stop buffer overflow
	for (size_t x = 0; x < length; x++) {
		const char c = input[x];
		const char *cur = &input[x];
		column += (c == '\t' ? ASSIMP_FBX_TAB_WIDTH : 1);

		if (IsLineEnd(c)) {
			comment = false;

			column = 0;
			++line;
		}

		if (comment) {
			continue;
		}

		if (in_double_quotes) {
			if (c == '\"') {
				in_double_quotes = false;
				token_end = cur;

				ProcessDataToken(output_tokens, token_begin, token_end, line, column);
				pending_data_token = false;
			}
			continue;
		}

		switch (c) {
			case '\"':
				if (token_begin) {
					TokenizeError("unexpected double-quote", line, column);
				}
				token_begin = cur;
				in_double_quotes = true;
				continue;

			case ';':
				ProcessDataToken(output_tokens, token_begin, token_end, line, column);
				comment = true;
				continue;

			case '{':
				ProcessDataToken(output_tokens, token_begin, token_end, line, column);
				output_tokens.push_back(new_Token(cur, cur + 1, TokenType_OPEN_BRACKET, line, column));
				continue;

			case '}':
				ProcessDataToken(output_tokens, token_begin, token_end, line, column);
				output_tokens.push_back(new_Token(cur, cur + 1, TokenType_CLOSE_BRACKET, line, column));
				continue;

			case ',':
				if (pending_data_token) {
					ProcessDataToken(output_tokens, token_begin, token_end, line, column, TokenType_DATA, true);
				}
				output_tokens.push_back(new_Token(cur, cur + 1, TokenType_COMMA, line, column));
				continue;

			case ':':
				if (pending_data_token) {
					ProcessDataToken(output_tokens, token_begin, token_end, line, column, TokenType_KEY, true);
				} else {
					TokenizeError("unexpected colon", line, column);
				}
				continue;
		}

		if (IsSpaceOrNewLine(c)) {
			if (token_begin) {
				// peek ahead and check if the next token is a colon in which
				// case this counts as KEY token.
				TokenType type = TokenType_DATA;
				for (const char *peek = cur; *peek && IsSpaceOrNewLine(*peek); ++peek) {
					if (*peek == ':') {
						type = TokenType_KEY;
						cur = peek;
						break;
					}
				}

				ProcessDataToken(output_tokens, token_begin, token_end, line, column, type);
			}

			pending_data_token = false;
		} else {
			token_end = cur;
			if (!token_begin) {
				token_begin = cur;
			}

			pending_data_token = true;
		}
	}
}

} // namespace FBXDocParser