// internal static readonly AstNode wherePatternCase1 = // new InvocationExpression( // new MemberReferenceExpression( // new InvocationExpression( // new MemberReferenceExpression(new AnyNode("target"), "Where"), // new LambdaExpression { // Parameters = { PatternHelper.NamedParameter ("param1", PatternHelper.AnyType ("paramType", true), Pattern.AnyString) }, // Body = PatternHelper.OptionalParentheses (new IsExpression(new AnyNode("expr1"), new AnyNode("type"))) // } // ), "Select"), // new LambdaExpression { // Parameters = { PatternHelper.NamedParameter ("param2", PatternHelper.AnyType ("paramType", true), Pattern.AnyString) }, // Body = PatternHelper.OptionalParentheses (new AsExpression(PatternHelper.OptionalParentheses (new AnyNode("expr2")), new Backreference("type"))) // } // ); // // internal static readonly AstNode wherePatternCase2 = // new InvocationExpression( // new MemberReferenceExpression( // new InvocationExpression( // new MemberReferenceExpression(new AnyNode("target"), "Where"), // new LambdaExpression { // Parameters = { PatternHelper.NamedParameter ("param1", PatternHelper.AnyType ("paramType", true), Pattern.AnyString) }, // Body = PatternHelper.OptionalParentheses (new IsExpression(PatternHelper.OptionalParentheses (new AnyNode("expr1")), new AnyNode("type"))) // } // ), "Select"), // new LambdaExpression { // Parameters = { PatternHelper.NamedParameter ("param2", PatternHelper.AnyType ("paramType", true), Pattern.AnyString) }, // Body = PatternHelper.OptionalParentheses (new CastExpression(new Backreference("type"), PatternHelper.OptionalParentheses (new AnyNode("expr2")))) // } // ); static bool MatchWhereSelect(InvocationExpressionSyntax selectInvoke, out ExpressionSyntax target, out TypeSyntax type) { target = null; type = null; if (selectInvoke.ArgumentList.Arguments.Count != 1) return false; var anyInvokeBase = selectInvoke.Expression as MemberAccessExpressionSyntax; if (anyInvokeBase == null || anyInvokeBase.Name.Identifier.Text != "Select") return false; var whereInvoke = anyInvokeBase.Expression as InvocationExpressionSyntax; if (whereInvoke == null || whereInvoke.ArgumentList.Arguments.Count != 1) return false; var baseMember = whereInvoke.Expression as MemberAccessExpressionSyntax; if (baseMember == null || baseMember.Name.Identifier.Text != "Where") return false; target = baseMember.Expression; ParameterSyntax param1, param2; ExpressionSyntax expr1, expr2; if (!ExtractLambda(whereInvoke.ArgumentList.Arguments[0], out param1, out expr1)) return false; if (!ExtractLambda(selectInvoke.ArgumentList.Arguments[0], out param2, out expr2)) return false; if (!expr1.IsKind(SyntaxKind.IsExpression)) return false; type = (expr1 as BinaryExpressionSyntax)?.Right as TypeSyntax; if (type == null) return false; if (expr2.IsKind(SyntaxKind.AsExpression)) { if (!CompareNames(param2, (expr2 as BinaryExpressionSyntax).Left as IdentifierNameSyntax)) return false; if (!type.IsEquivalentTo((expr2 as BinaryExpressionSyntax)?.Right)) return false; } else if (expr2.IsKind(SyntaxKind.CastExpression)) { if (!CompareNames(param2, (expr2 as CastExpressionSyntax)?.Expression.SkipParens() as IdentifierNameSyntax)) return false; if (!type.IsEquivalentTo((expr2 as CastExpressionSyntax)?.Type)) return false; } else return false; if (!CompareNames(param1, (expr1 as BinaryExpressionSyntax)?.Left as IdentifierNameSyntax)) return false; return target != null; }