Function trimComment

source/MRMesh/MRMeshLoadObj.cpp:872–965

remove white spaces, meaningless or case-specific information from a comment line

/// remove white spaces, meaningless or case-specific information from a comment line
void trimComment( std::string_view& line )
{
    while ( !line.empty() && ( line[0] == '#' || line[0] == ' ' || line[0] == '\t' ) )
        line.remove_prefix( 1 );
    while ( !line.empty() && ( line.back() == ' ' || line.back() == '\t' || line.back() == '\r' || line.back() == '\n' ) )
        line.remove_suffix( 1 );
    if ( line.empty() )
        return;

    //'1068822 vertices, 2102387 faces'
    if ( line.ends_with( " faces" ) && line.find( " vertices, " ) != std::string_view::npos )
    {
        line = std::string_view{};
        return;
    }
    
    //'URANIUM OBJ EXPORT Mon 12 Jan 2026 20:26:57'
    if ( line.starts_with( "URANIUM OBJ EXPORT " ) )
    {
        line = line.substr( 0, 18 );
        return;
    }

    //'BlueSkyPlan 5.0.29.1 08/01/2026 15:04:20 UTC'
    if ( line.starts_with( "BlueSkyPlan " ) )
    {
        line = line.substr( 0, line.find_first_of( ' ', 13 ) ); // till the space after version
        return;
    }

    //'Created by meshio v5.3.5, 2026-02-08T17:36:42.731777'
    if ( line.starts_with( "Created by meshio " ) )
    {
        line = line.substr( 0, line.find_first_of( ' ', 19 ) ); // till the space after version
        return;
    }

    //'Reconstructed 4D: Element_V5'
    if ( line.starts_with( "Reconstructed 4D: " ) )
    {
        line = line.substr( 0, 17 ); // 'Reconstructed 4D:'
        return;
    }

    //'Wavefront OBJ file written 2018-08-03T14:33:08'
    if ( line.starts_with( "Wavefront OBJ file written " ) )
    {
        line = line.substr( 0, 26 ); // 'Wavefront OBJ file written'
        return;
    }

    //'Wavefront OBJ file: filename.obj'
    if ( line.starts_with( "Wavefront OBJ file: " ) )
    {
        line = line.substr( 0, 19 ); // 'Wavefront OBJ file:'
        return;
    }