assimp.assimp/code/AssetLib/VRML/VrmlConverter.cpp

/*
Open Asset Import Library (assimp)
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*/
/// \file   VrmlImporter.cpp
/// \brief  Convert VRML-formatted (.wrl, .x3dv) files to X3D .xml format
/// \date   2024
/// \author tellypresence

#ifndef ASSIMP_BUILD_NO_X3D_IMPORTER

#include <memory> // std::unique_ptr
#include "VrmlConverter.hpp"

namespace Assimp {

bool isFileWrlVrml97Ext(const std::string &pFile) {
    size_t pos = pFile.find_last_of('.');
    if (pos == std::string::npos) {
        return false;
    }
    std::string ext = pFile.substr(pos + 1);
    if (ext.size() != 3) {
        return false;
    }
    return (ext[0] == 'w' || ext[0] == 'W') && (ext[1] == 'r' || ext[1] == 'R') && (ext[2] == 'l' || ext[2] == 'L');
}

bool isFileX3dvClassicVrmlExt(const std::string &pFile) {
    size_t pos = pFile.find_last_of('.');
    if (pos == std::string::npos) {
        return false;
    }
    std::string ext = pFile.substr(pos + 1);
    if (ext.size() != 4) {
        return false;
    }
    return (ext[0] == 'x' || ext[0] == 'X') && (ext[1] == '3') && (ext[2] == 'd' || ext[2] == 'D') && (ext[3] == 'v' || ext[3] == 'V');
}

#if !defined(ASSIMP_BUILD_NO_VRML_IMPORTER)
static VrmlTranslator::Scanner createScanner(const std::string &pFile) {
    std::unique_ptr<wchar_t[]> wide_stringPtr{ new wchar_t[ pFile.length() + 1 ] };
    std::copy(pFile.begin(), pFile.end(), wide_stringPtr.get());
    wide_stringPtr[ pFile.length() ] = 0;

    return VrmlTranslator::Scanner(wide_stringPtr.get());
} // wide_stringPtr auto-deleted when leaving scope
#endif // #if !defined(ASSIMP_BUILD_NO_VRML_IMPORTER)

std::stringstream ConvertVrmlFileToX3dXmlFile(const std::string &pFile) {
    std::stringstream ss;
    if (isFileWrlVrml97Ext(pFile) || isFileX3dvClassicVrmlExt(pFile)) {
#if !defined(ASSIMP_BUILD_NO_VRML_IMPORTER)
        VrmlTranslator::Scanner scanner = createScanner(pFile);
        VrmlTranslator::Parser parser(&scanner);
        parser.Parse();
        ss.str("");
        parser.doc_.save(ss);
#endif // #if !defined(ASSIMP_BUILD_NO_VRML_IMPORTER)
    }
    return ss;
}

} // namespace Assimp

#endif // !ASSIMP_BUILD_NO_X3D_IMPORTER