private Expression ReadString()
{
Token start = Consume(TokenKind.StringStart);
StringExpression exp = new StringExpression(start.Line, start.Column);
while (true) {
Token tok = Current;
if (tok.Kind == TokenKind.StringEnd) {
Consume();
break;
}
if (tok.Kind == TokenKind.EOF)
throw new ParseException("Unexpected end of file", tok.Line, tok.Column);
if (tok.Kind == TokenKind.StringText) {
Consume();
exp.AddExpression(new StringLiteralExpression(tok.Line, tok.Column, tok.Text));
} else if (tok.Kind == TokenKind.ExpStart)
exp.AddExpression(ReadExpression());
else
throw new ParseException("Unexpected token in string: " + tok.Kind, tok.Line, tok.Column);
}
return exp.Count == 1 ? exp[0] : exp;
}