Function substituteInternal

src/IECore/StringAlgo.cpp:110–236

#if BOOST_VERSION > 105500

inline void substituteInternal( const char *s, const StringAlgo::VariableProvider &variables, std::string &result, const int recursionDepth, unsigned substitutions )
{
	if( recursionDepth > 8 )
	{
		throw IECore::Exception( "StringAlgo::substitute() : maximum recursion depth reached." );
	}

	while( *s )
	{
		switch( *s )
		{
			case '\\' :
			{
				if( substitutions & StringAlgo::EscapeSubstitutions )
				{
					s++;
					if( *s )
					{
						result.push_back( *s++ );
					}
				}
				else
				{
					// variable substitutions disabled
					result.push_back( *s++ );
				}
				break;
			}
			case '$' :
			{
				if( substitutions & StringAlgo::VariableSubstitutions )
				{
					s++; // skip $
					bool bracketed = *s =='{';
					const char *variableNameStart = nullptr;
					const char *variableNameEnd = nullptr;
					if( bracketed )
					{
						s++; // skip initial bracket
						variableNameStart = s;
						while( *s && *s != '}' )
						{
							s++;
						}
						variableNameEnd = s;
						if( *s )
						{
							s++; // skip final bracket
						}
					}
					else
					{
						variableNameStart = s;
						while( isalnum( *s ) )
						{
							s++;
						}
						variableNameEnd = s;