assimp.assimp/code/Common/RemoveComments.cpp

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

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  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the
  following disclaimer in the documentation and/or other
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* Neither the name of the assimp team, nor the names of its
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  written permission of the assimp team.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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*/

/**
 *  @file  RemoveComments.cpp
 *  @brief Defines the CommentRemover utility class
 */

#include <assimp/RemoveComments.h>
#include <assimp/ParsingUtils.h>

namespace Assimp {

// ------------------------------------------------------------------------------------------------
// Remove line comments from a file
void CommentRemover::RemoveLineComments(const char* szComment, char* szBuffer, char chReplacement /* = ' ' */) {
    // validate parameters
    ai_assert(nullptr != szComment);
    ai_assert(nullptr != szBuffer);
    ai_assert(*szComment);

    size_t len = strlen(szComment);
    const size_t lenBuffer = strlen(szBuffer);
    if (len > lenBuffer) {
        len = lenBuffer;
    }

    for(size_t i = 0; i < lenBuffer; i++) {
        // skip over quotes
        if (szBuffer[i] == '\"' || szBuffer[i] == '\'')
            while (++i < lenBuffer && szBuffer[i] != '\"' && szBuffer[i] != '\'');

        if(lenBuffer - i < len) {
            break;
        }

        if (!strncmp(szBuffer + i,szComment,len)) {
            while (i < lenBuffer && !IsLineEnd(szBuffer[i])) {
                szBuffer[i++] = chReplacement;
            }
        }
    }
}

// ------------------------------------------------------------------------------------------------
// Remove multi-line comments from a file
void CommentRemover::RemoveMultiLineComments(const char* szCommentStart,
        const char* szCommentEnd,char* szBuffer,
        char chReplacement) {
    // validate parameters
    ai_assert(nullptr != szCommentStart);
    ai_assert(nullptr != szCommentEnd);
    ai_assert(nullptr != szBuffer);
    ai_assert(*szCommentStart);
    ai_assert(*szCommentEnd);

    const size_t len  = strlen(szCommentEnd);
    const size_t len2 = strlen(szCommentStart);

    while (*szBuffer)   {
        // skip over quotes
        if (*szBuffer == '\"' || *szBuffer == '\'') {
            while (*szBuffer++ && *szBuffer != '\"' && *szBuffer != '\'');
        }

        if (!strncmp(szBuffer,szCommentStart,len2))  {
            while (*szBuffer) {
                if (!::strncmp(szBuffer,szCommentEnd,len)) {
                    for (unsigned int i = 0; i < len;++i) {
                        *szBuffer++ = chReplacement;
                    }

                    break;
                }
                *szBuffer++ = chReplacement;
            }
            continue;
        }
        ++szBuffer;
    }
}

} // !! Assimp