private ITree ParseExpression(SimpleLanguageLexer lexer)
{
var parser = new SimpleLanguageParser(new CommonTokenStream(lexer));
parser.Error += m => OnError("Parser", m);
return (ITree) parser.program().Tree;
}
private SimpleLanguageLexer CreateLexer(string expression)
{
var lexer = new SimpleLanguageLexer(new ANTLRStringStream(expression));
lexer.Error += m => OnError("Lexer", m);
return lexer;
}