assimp/code/AssetLib/FBX/FBXTokenizer.cpp

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

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  following disclaimer.

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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 <assimp/ParsingUtils.h>

#include "FBXTokenizer.h"
#include "FBXUtil.h"
#include <assimp/Exceptional.h>
#include <assimp/DefaultLogger.hpp>

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 = nullptr;
}

}

// ------------------------------------------------------------------------------------------------
void Tokenize(TokenList& output_tokens, const char* input)
{
	ai_assert(input);
	ASSIMP_LOG_DEBUG("Tokenizing ASCII FBX file");

    // 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;
    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