public static StringBuilder GetUnescapedStringFromGrammarStringLiteral( string literal )
{
//[email protected]("escape: ["+literal+"]");
StringBuilder buf = new StringBuilder();
int last = literal.Length - 1; // skip quotes on outside
for ( int i = 1; i < last; i++ )
{
char c = literal[i];
if ( c == '\\' )
{
i++;
c = literal[i];
if ( char.ToUpperInvariant( c ) == 'U' )
{
// \u0000
i++;
string unicodeChars = literal.Substring( i, 4 );
// parse the unicode 16 bit hex value
//int val = Integer.parseInt( unicodeChars, 16 );
int val = int.Parse( unicodeChars, System.Globalization.NumberStyles.AllowHexSpecifier );
i += 4 - 1; // loop will inc by 1; only jump 3 then
buf.Append( (char)val );
}
else if ( char.IsDigit( c ) )
{
ErrorManager.Error( ErrorManager.MSG_SYNTAX_ERROR,
"invalid char literal: " + literal );
buf.Append( "\\" + (char)c );
}
else
{
buf.Append( (char)AntlrLiteralEscapedCharValue[c] ); // normal \x escape
}
}
else
{
buf.Append( c ); // simple char x
}
}
//[email protected]("string: ["+buf.toString()+"]");
return buf;
}
