code: /*************************************************************************/
  /*  FBXTokenizer.cpp                                                     */
  /*************************************************************************/
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  /*
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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/string/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
  