public static GroupExpression Parse(ExpressionWalker ew, ExpressionToken left, ExpressionToken right) { ew.IsCurrentOrThrow(left); ew.NextOrThrow(); if (ew.Current.Token == right) { throw new UnexpectedTokenException($"Expected an expression, found end of group of type {right}"); } var expr = ParseExpression(ew, typeof(GroupExpression)); var grp = new GroupExpression() { _matchLeft = AttributeExtensions.GetAttribute <ExpressionTokenAttribute>(left).Emit.AsResult(), _matchRight = AttributeExtensions.GetAttribute <ExpressionTokenAttribute>(right).Emit.AsResult() }; if (ew.IsCurrent(ExpressionToken.Or)) { grp.InnerExpression = TernaryExpression.Parse(ew, expr); } else { grp.InnerExpression = expr; } ew.IsCurrentOrThrow(right); ew.Next(); return(grp); }
public static Expression ParseExpression(ExpressionWalker ew, Type caller = null) { Expression ret = null; _retry: bool isOperatorCall = caller == typeof(OperatorExpression) || caller == typeof(RightOperatorExpression) || caller == typeof(ForeachExpression); var current = ew.Current.Token; if (current == ExpressionToken.Literal) { //cases like variable(.., variable[.., variable + .., variable if (ew.HasNext) { var peak = ew.PeakNextOrThrow().Token; if (peak == ExpressionToken.LeftParen) { ret = CallExpression.Parse(ew); } else if (peak == ExpressionToken.Period && caller != typeof(IdentityExpression) && caller != typeof(InteractableExpression)) { ret = IdentityExpression.Parse(ew); } else if (peak == ExpressionToken.LeftBracet) { ret = IndexerCallExpression.Parse(ew); } else if (peak == ExpressionToken.New) { ret = NewExpression.Parse(ew); } else if (RightOperatorExpression.IsNextAnRightUniOperation(ew, caller) && caller != typeof(RightOperatorExpression)) { ret = RightOperatorExpression.Parse(ew); } else if (OperatorExpression.IsNextAnOperation(ew) && !isOperatorCall) { ret = OperatorExpression.Parse(ew); } else { ret = IdentityExpression.Parse(ew, caller); } } else { ret = IdentityExpression.Parse(ew, caller); } } else if (LeftOperatorExpression.IsCurrentAnLeftUniOperation(ew)) { ret = LeftOperatorExpression.Parse(ew); } else if (current == ExpressionToken.NumberLiteral) { ret = NumberLiteral.Parse(ew); } else if (current == ExpressionToken.StringLiteral) { ret = StringLiteral.Parse(ew); } else if (current == ExpressionToken.LeftParen) { ret = GroupExpression.Parse(ew, ExpressionToken.LeftParen, ExpressionToken.RightParen); } else if (current == ExpressionToken.LeftBracet) { ret = ArrayExpression.Parse(ew); } else if (current == ExpressionToken.New) { ret = NewExpression.Parse(ew); } else if (current == ExpressionToken.Boolean) { ret = BooleanLiteral.Parse(ew); } else if (current == ExpressionToken.CharLiteral) { ret = CharLiteral.Parse(ew); } else if (current == ExpressionToken.Throw) { ret = ThrowExpression.Parse(ew); } else if (current == ExpressionToken.Hashtag && ew.HasNext && ew.PeakNext.Token == ExpressionToken.NumberLiteral) { ret = HashtagReferenceExpression.Parse(ew, caller); } else if (current == ExpressionToken.Null) { ret = NullIdentity.Parse(ew); } else if (current == ExpressionToken.NewLine) { ew.NextOrThrow(); goto _retry; } else { throw new UnexpectedTokenException($"Token was not expected to be a {ew.Current.Token}"); } _rereview: //here we parse chained math operations while (OperatorExpression.IsCurrentAnOperation(ew) && !isOperatorCall) { if (RightOperatorExpression.IsCurrentAnRightUniOperation(ew) && caller != typeof(OperatorExpression)) { ret = RightOperatorExpression.Parse(ew, ret); } else if (OperatorExpression.IsCurrentAnOperation(ew)) { ret = OperatorExpression.Parse(ew, ret); } } if (ew.IsCurrent(ExpressionToken.Or) && caller != typeof(TernaryExpression) && caller != typeof(OperatorExpression)) { ret = TernaryExpression.Parse(ew, ret); } if (ew.IsCurrent(ExpressionToken.LeftBracet)) { ret = IndexerCallExpression.Parse(ew, ret); goto _rereview; } if (ew.IsCurrent(ExpressionToken.LeftParen)) { ret = CallExpression.Parse(ew, ret); goto _rereview; } return(ret); }