public Expression <Func <object> > ParseExpression(string expression)
{
var inputStream = new AntlrInputStream(expression);
var lexer = new NespGrammarLexer(inputStream);
var commonTokenStream = new CommonTokenStream(lexer);
var grammarParser = new NespGrammarParser(commonTokenStream);
// Take from body rule.
var context = (IParseTree)grammarParser.body();
NespExpression expr;
lock (parser)
{
expr = parser.Visit(context);
}
return(null);
//var valueType = typeof(object);
//var strictExpr = (expr.Type == valueType)
// ? expr
// : Expression.Convert(expr, valueType);
//return Expression.Lambda<Func<object>>(
// strictExpr, false, Enumerable.Empty<ParameterExpression>());
}
private static string Parse(string text, Func <NespGrammarParser, ParserRuleContext> parseToContext)
{
var inputStream = new AntlrInputStream(text);
var lexer = new NespGrammarLexer(inputStream);
var commonTokenStream = new CommonTokenStream(lexer);
var grammarParser = new NespGrammarParser(commonTokenStream);
var graphContext = parseToContext(grammarParser);
return(graphContext.ToStringTree(grammarParser.RuleNames));
}
private NespAbstractListExpression ParseAndVisit(string replLine)
{
var inputStream = new AntlrInputStream(replLine);
var lexer = new NespGrammarLexer(inputStream);
var commonTokenStream = new CommonTokenStream(lexer);
var grammarParser = new NespGrammarParser(commonTokenStream);
var parser = new NespParser(new MemberBinder());
parser.AddMembers(NespBaseExtension.CreateMemberProducer());
parser.AddMembers(NespStandardExtension.CreateMemberProducer());
return((NespAbstractListExpression)parser.Visit(grammarParser.body()));
}