Exemplo n.º 1
0
		private IfStatement ParseIfElse ()
		{
			Token start = current;
			Next ();
			CheckSyntaxExpected (Token.Type.LeftParenthesis);
			Token leftParen = current;
			Next ();
			Expression condition = ParseExpression ();
			CheckSyntaxExpected (Token.Type.RightParenthesis);
			Token rightParen = current;
			Next ();
			Statement ifBody = ParseStatement ();
			Next ();
			Statement elseBody = null;
			TextPoint elsePoint = new TextPoint();
			if (current.Kind == Token.Type.@else) {
				elsePoint = new TextPoint(current.StartPosition);
				elseBody = ParseStatement ();
			}
			return new IfStatement (condition, ifBody, elseBody, new TextSpan (start, current), new TextSpan (start, rightParen), new TextPoint (leftParen.StartPosition), new TextPoint (rightParen.StartPosition), elsePoint);
		}
Exemplo n.º 2
0
		private LabelStatement ParseLabelStatement ()
		{
			Token start = current;
			CheckSyntaxExpected (Token.Type.Identifier);
			Identifier label = ((IdentifierToken)current).Spelling;
			Next ();
			CheckSyntaxExpected (Token.Type.Colon);
			TextPoint colon = new TextPoint (current.StartPosition);
			Next ();
			if (LabelSet.Contains (label.Spelling))
				Error (DiagnosticCode.EnclosingLabelShadowed, new TextSpan (start, current));
			LabelSet.Add (label.Spelling);
			Statement labeled = ParseStatement();
			LabelSet.Remove (label.Spelling);
			return new LabelStatement (label, labeled, new TextSpan (start, current), colon);
		}
Exemplo n.º 3
0
		private List<Parameter> ParseListParametter ()
		{
			List<Parameter> result = new List<Parameter>();
			if (current.Kind == Token.Type.RightParenthesis)
				return result;

			CheckSyntaxExpected (Token.Type.Identifier);
			Next ();
			TextPoint comma;
			while (current.Kind == Token.Type.Comma) {
				comma = new TextPoint (current.StartPosition);
				Next ();
				if (CheckSyntaxExpected (Token.Type.Identifier))
					result.Add (new Parameter ((current as IdentifierToken).Spelling, new TextSpan (current, current), comma));

				Next ();
			}
			return result;
		}
Exemplo n.º 4
0
		private ArrayLiteralExpression ParseArrayLiteral ()
		{
			Token start = current;
			
			List<ExpressionListElement> elements = new List<ExpressionListElement> ();
			
			TextPoint comma = new TextPoint();
			do {
				Next ();
				if (current.Kind == Token.Type.RightBracket)
					break;
				Expression exp = null;
				//take care of elision
				if (current.Kind != Token.Type.Comma)
					exp = ParseAssignmentExpression (false);
				ExpressionListElement element = new ExpressionListElement (exp, comma);
				elements.Add (element);
				comma = new TextPoint(current.StartPosition);
			} while (current.Kind == Token.Type.Comma);
			CheckSyntaxExpected (Token.Type.RightBracket);
			return new ArrayLiteralExpression (elements, new TextSpan(start, current));
		}
Exemplo n.º 5
0
		private Expression ParseObjectLiteral ()
		{
			Token start = current;
			Next ();
			List<ObjectLiteralElement> elements = new List<ObjectLiteralElement> ();
			if (current.Kind == Token.Type.RightBrace) {
				return new ObjectLiteralExpression (elements, new TextSpan (start, current));
			}
			
			ObjectLiteralElement element;
			TextPoint comma = new TextPoint ();
			TextPoint colon = new TextPoint ();
			Expression name;
			do {
				switch (current.Kind) {
					case Token.Type.Identifier:
						name = new IdentifierExpression ((current as IdentifierToken).Spelling, new TextSpan (current, current));
						break;
					case Token.Type.NumericLiteral:
						name = new NumericLiteralExpression (((NumericLiteralToken)current).Spelling, new TextSpan (current, current));
						break;
					case Token.Type.StringLiteral:
						name = new StringLiteralExpression ((current as StringLiteralToken).Value, (current as StringLiteralToken).Spelling, new TextSpan (current, current));
						break;
					default:
						Error (DiagnosticCode.SyntaxError, new TextSpan (current, current));
						return new Expression (Expression.Operation.SyntaxError, new TextSpan (current, current));					
				}
				Next ();
				CheckSyntaxExpected (Token.Type.Colon);
				colon = new TextPoint (current.StartPosition);
				Next ();
				Expression val = ParseAssignmentExpression (false);
				element = new ObjectLiteralElement (name, val, colon, comma);
				elements.Add (element);
				comma = new TextPoint (current.StartPosition);
			} while (current.Kind == Token.Type.Comma);
			CheckSyntaxExpected (Token.Type.RightBrace);
			elements.Add (element);
			return new ObjectLiteralExpression (elements, new TextSpan (start, current));
		}
Exemplo n.º 6
0
		private FunctionDefinition ParseFunctionDefinition ()
		{
			Token start = current;

			Next ();
			Identifier id = null;
			if (CheckSyntaxExpected (Token.Type.Identifier))
				id = ((IdentifierToken)current).Spelling;

			TextPoint NameLocation = new TextPoint (current.StartPosition);

			Next ();
			TextPoint leftParenLocation = new TextPoint();
			CheckSyntaxExpected (Token.Type.LeftParenthesis);
			leftParenLocation = new TextPoint (current.StartPosition);

			Next ();
			List<Parameter> parametters = ParseListParametter ();
			TextPoint rightParenLocation = new TextPoint();
			CheckSyntaxExpected (Token.Type.RightParenthesis);
			rightParenLocation = new TextPoint (current.StartPosition);
			
			Token headerEnd = current;

			Next ();
			BlockStatement body = ParseBlock ();
			TextSpan location = new TextSpan (start, current);
			TextSpan HeaderLocation = new TextSpan (start, headerEnd);

			return new FunctionDefinition (id, parametters, body, location, HeaderLocation, NameLocation, leftParenLocation, rightParenLocation);
		}