assimp/code/FBXTokenizer.cpp

/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------

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All rights reserved.

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  following disclaimer.

* Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
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*/

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

#ifndef ASSIMP_BUILD_NO_FBX_IMPORTER

// tab width for logging columns
#define ASSIMP_FBX_TAB_WIDTH 4

#include "ParsingUtils.h"

#include "FBXTokenizer.h"
#include "FBXUtil.h"
#include "Exceptional.h"

namespace Assimp {
namespace FBX {

// ------------------------------------------------------------------------------------------------
Token::Token(const char* sbegin, const char* send, TokenType type, unsigned int line, unsigned int column)
	:
#ifdef DEBUG
	contents(sbegin, static_cast<size_t>(send-sbegin)),
#endif
	sbegin(sbegin)
	, send(send)
	, type(type)
	, line(line)
	, column(column)
{
	ai_assert(sbegin);
	ai_assert(send);

	// tokens must be of non-zero length
	ai_assert(static_cast<size_t>(send-sbegin) > 0);
}


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


namespace {

// ------------------------------------------------------------------------------------------------
// signal tokenization error, this is always unrecoverable. Throws DeadlyImportError.
AI_WONT_RETURN void TokenizeError(const std::string& message, unsigned int line, unsigned int column) AI_WONT_RETURN_SUFFIX;
AI_WONT_RETURN void TokenizeError(const std::string& message, unsigned int line, unsigned int column)
{
	throw DeadlyImportError(Util::AddLineAndColumn("FBX-Tokenize",message,line,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 = NULL;
}

}

// ------------------------------------------------------------------------------------------------
void Tokenize(TokenList& output_tokens, const char* input)
{
	ai_assert(input);

	// 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 = NULL, *token_end = NULL;
	for (const char* cur = input;*cur;column += (*cur == '\t' ? ASSIMP_FBX_TAB_WIDTH : 1), ++cur) {
		const char c = *cur;

		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;
		}
	}
}

} // !FBX
} // !Assimp

#endif