internal BoundExpression BindQuery(QueryExpressionSyntax node, DiagnosticBag diagnostics) { var fromClause = node.FromClause; var boundFromExpression = BindLeftOfPotentialColorColorMemberAccess(fromClause.Expression, diagnostics); QueryTranslationState state = new QueryTranslationState(); state.fromExpression = MakeMemberAccessValue(boundFromExpression, diagnostics); var x = state.rangeVariable = state.AddRangeVariable(this, fromClause.Identifier, diagnostics); for (int i = node.Body.Clauses.Count - 1; i >= 0; i--) { state.clauses.Push(node.Body.Clauses[i]); } state.selectOrGroup = node.Body.SelectOrGroup; // A from clause that explicitly specifies a range variable type // from T x in e // is translated into // from x in ( e ) . Cast < T > ( ) BoundExpression cast = null; if (fromClause.Type != null) { var typeRestriction = BindTypeArgument(fromClause.Type, diagnostics); cast = MakeQueryInvocation(fromClause, state.fromExpression, "Cast", fromClause.Type, typeRestriction, diagnostics); state.fromExpression = cast; } state.fromExpression = MakeQueryClause(fromClause, state.fromExpression, x, castInvocation: cast); BoundExpression result = BindQueryInternal1(state, diagnostics); for (QueryContinuationSyntax continuation = node.Body.Continuation; continuation != null; continuation = continuation.Body.Continuation) { // A query expression with a continuation // from ... into x ... // is translated into // from x in ( from ... ) ... state.Clear(); state.fromExpression = result; x = state.rangeVariable = state.AddRangeVariable(this, continuation.Identifier, diagnostics); Debug.Assert(state.clauses.IsEmpty()); var clauses = continuation.Body.Clauses; for (int i = clauses.Count - 1; i >= 0; i--) { state.clauses.Push(clauses[i]); } state.selectOrGroup = continuation.Body.SelectOrGroup; result = BindQueryInternal1(state, diagnostics); result = MakeQueryClause(continuation.Body, result, x); result = MakeQueryClause(continuation, result, x); } state.Free(); return(MakeQueryClause(node, result)); }
private void ReduceLet(LetClauseSyntax let, QueryTranslationState state, DiagnosticBag diagnostics) { // A query expression with a let clause // from x in e // let y = f // ... // is translated into // from * in ( e ) . Select ( x => new { x , y = f } ) // ... var x = state.rangeVariable; // We use a slightly different translation strategy. We produce // from * in ( e ) . Select ( x => new Pair<X,Y>(x, f) ) // Where X is the type of x, and Y is the type of the expression f. // Subsequently, x (or members of x, if it is a transparent identifier) // are accessed as TRID.Item1 (or members of that), and y is accessed // as TRID.Item2, where TRID is the compiler-generated identifier used // to represent the transparent identifier in the result. LambdaBodyFactory bodyFactory = (LambdaSymbol lambdaSymbol, Binder lambdaBodyBinder, DiagnosticBag d) => { var xExpression = new BoundParameter(let, lambdaSymbol.Parameters[0]) { WasCompilerGenerated = true }; lambdaBodyBinder = lambdaBodyBinder.GetBinder(let.Expression); Debug.Assert(lambdaBodyBinder != null); var yExpression = lambdaBodyBinder.BindValue(let.Expression, d, BindValueKind.RValue); SourceLocation errorLocation = new SourceLocation(let.SyntaxTree, new TextSpan(let.Identifier.SpanStart, let.Expression.Span.End - let.Identifier.SpanStart)); if (!yExpression.HasAnyErrors && !yExpression.HasExpressionType()) { Error(d, ErrorCode.ERR_QueryRangeVariableAssignedBadValue, errorLocation, yExpression.Display); yExpression = new BoundBadExpression(yExpression.Syntax, LookupResultKind.Empty, ImmutableArray <Symbol> .Empty, ImmutableArray.Create(yExpression), CreateErrorType()); } else if (!yExpression.HasAnyErrors && yExpression.Type.SpecialType == SpecialType.System_Void) { Error(d, ErrorCode.ERR_QueryRangeVariableAssignedBadValue, errorLocation, yExpression.Type); yExpression = new BoundBadExpression(yExpression.Syntax, LookupResultKind.Empty, ImmutableArray <Symbol> .Empty, ImmutableArray.Create(yExpression), yExpression.Type); } var construction = MakePair(let, x.Name, xExpression, let.Identifier.ValueText, yExpression, state, d); // The bound block represents a closure scope for transparent identifiers captured in the let clause. // Such closures shall be associated with the lambda body expression. return(lambdaBodyBinder.CreateLambdaBlockForQueryClause(let.Expression, construction, d)); }; var lambda = MakeQueryUnboundLambda(state.RangeVariableMap(), ImmutableArray.Create(x), let.Expression, bodyFactory); state.rangeVariable = state.TransparentRangeVariable(this); state.AddTransparentIdentifier(x.Name); var y = state.AddRangeVariable(this, let.Identifier, diagnostics); state.allRangeVariables[y].Add(let.Identifier.ValueText); var invocation = MakeQueryInvocation(let, state.fromExpression, "Select", lambda, diagnostics); state.fromExpression = MakeQueryClause(let, invocation, y, invocation); }
void ReduceFrom(FromClauseSyntax from, QueryTranslationState state, DiagnosticBag diagnostics) { var x1 = state.rangeVariable; TypeSymbol castType = from.Type == null ? null : BindTypeArgument(from.Type, diagnostics); BoundExpression lambda1 = MakeQueryUnboundLambda(state.RangeVariableMap(), x1, from.Expression, from.Type, castType); var x2 = state.AddRangeVariable(this, from.Identifier, diagnostics); if (state.clauses.IsEmpty() && state.selectOrGroup.Kind == SyntaxKind.SelectClause) { // A query expression with a second from clause followed by a select clause // from x1 in e1 // from x2 in e2 // select v // is translated into // ( e1 ) . SelectMany( x1 => e2 , ( x1 , x2 ) => v ) var select = state.selectOrGroup as SelectClauseSyntax; BoundExpression lambda2 = MakeQueryUnboundLambda(state.RangeVariableMap(), Args(x1, x2), select.Expression); var invocation = MakeQueryInvocation(from, state.fromExpression, "SelectMany", Args(lambda1, lambda2), diagnostics); BoundExpression castInvocation = (object)castType != null?ExtractCastInvocation(invocation) : null; var arguments = invocation.Arguments.ToArray(); // Adjust the second-to-last parameter to be a query clause. (if it was an extension method, an extra parameter was added) arguments[arguments.Length - 2] = MakeQueryClause(from, arguments[arguments.Length - 2], x2, invocation, castInvocation); invocation = invocation.Update(invocation.ReceiverOpt, invocation.Method, Args(arguments)); state.Clear(); state.fromExpression = MakeQueryClause(from, invocation, definedSymbol: x2, queryInvocation: invocation); state.fromExpression = MakeQueryClause(select, state.fromExpression); } else { // A query expression with a second from clause followed by something other than a select clause: // from x1 in e1 // from x2 in e2 // ... // is translated into // from * in ( e1 ) . SelectMany( x1 => e2 , ( x1 , x2 ) => new { x1 , x2 } ) // ... // We use a slightly different translation strategy. We produce // from * in ( e ) . SelectMany ( x1 => e2, ( x1 , x2 ) => new Pair<X1,X2>(x1, x2) ) // Where X1 is the type of x1, and X2 is the type of x2. // Subsequently, x1 (or members of x1, if it is a transparent identifier) // are accessed as TRID.Item1 (or members of that), and x2 is accessed // as TRID.Item2, where TRID is the compiler-generated identifier used // to represent the transparent identifier in the result. var lambda2 = MakePairLambda(from, state, x1, x2); var invocation = MakeQueryInvocation(from, state.fromExpression, "SelectMany", Args(lambda1, lambda2), diagnostics); BoundExpression castInvocation = (object)castType != null?ExtractCastInvocation(invocation) : null; state.fromExpression = MakeQueryClause(from, invocation, x2, invocation, castInvocation); } }
private void ReduceJoin(JoinClauseSyntax join, QueryTranslationState state, DiagnosticBag diagnostics) { var inExpression = BindValue(join.InExpression, diagnostics, BindValueKind.RValue); // If the from expression is of the type dynamic we can't infer the types for any lambdas that occur in the query. // Only if there are none we could bind the query but we report an error regardless since such queries are not useful. if (inExpression.HasDynamicType()) { diagnostics.Add(ErrorCode.ERR_BadDynamicQuery, join.InExpression.Location); inExpression = BadExpression(join.InExpression, inExpression); } BoundExpression castInvocation = null; if (join.Type != null) { // A join clause that explicitly specifies a range variable type // join T x in e on k1 equals k2 // is translated into // join x in ( e ) . Cast < T > ( ) on k1 equals k2 var castType = BindTypeArgument(join.Type, diagnostics); castInvocation = MakeQueryInvocation(join, inExpression, "Cast", join.Type, castType, diagnostics); inExpression = castInvocation; } var outerKeySelectorLambda = MakeQueryUnboundLambda(state.RangeVariableMap(), state.rangeVariable, join.LeftExpression); var x1 = state.rangeVariable; var x2 = state.AddRangeVariable(this, join.Identifier, diagnostics); var innerKeySelectorLambda = MakeQueryUnboundLambda(QueryTranslationState.RangeVariableMap(x2), x2, join.RightExpression); if (state.clauses.IsEmpty() && state.selectOrGroup.Kind() == SyntaxKind.SelectClause) { var select = state.selectOrGroup as SelectClauseSyntax; BoundCall invocation; if (join.Into == null) { // A query expression with a join clause without an into followed by a select clause // from x1 in e1 // join x2 in e2 on k1 equals k2 // select v // is translated into // ( e1 ) . Join( e2 , x1 => k1 , x2 => k2 , ( x1 , x2 ) => v ) var resultSelectorLambda = MakeQueryUnboundLambda(state.RangeVariableMap(), ImmutableArray.Create(x1, x2), select.Expression); invocation = MakeQueryInvocation( join, state.fromExpression, "Join", ImmutableArray.Create(inExpression, outerKeySelectorLambda, innerKeySelectorLambda, resultSelectorLambda), diagnostics); } else { // A query expression with a join clause with an into followed by a select clause // from x1 in e1 // join x2 in e2 on k1 equals k2 into g // select v // is translated into // ( e1 ) . GroupJoin( e2 , x1 => k1 , x2 => k2 , ( x1 , g ) => v ) state.allRangeVariables[x2].Free(); state.allRangeVariables.Remove(x2); var g = state.AddRangeVariable(this, join.Into.Identifier, diagnostics); var resultSelectorLambda = MakeQueryUnboundLambda(state.RangeVariableMap(), ImmutableArray.Create(x1, g), select.Expression); invocation = MakeQueryInvocation( join, state.fromExpression, "GroupJoin", ImmutableArray.Create(inExpression, outerKeySelectorLambda, innerKeySelectorLambda, resultSelectorLambda), diagnostics); // record the into clause in the bound tree var arguments = invocation.Arguments; arguments = arguments.SetItem(arguments.Length - 1, MakeQueryClause(join.Into, arguments[arguments.Length - 1], g)); invocation = invocation.Update(invocation.ReceiverOpt, invocation.Method, arguments); } state.Clear(); // this completes the whole query state.fromExpression = MakeQueryClause(join, invocation, x2, invocation, castInvocation); state.fromExpression = MakeQueryClause(select, state.fromExpression); } else { BoundCall invocation; if (join.Into == null) { // A query expression with a join clause without an into followed by something other than a select clause // from x1 in e1 // join x2 in e2 on k1 equals k2 // ... // is translated into // from * in ( e1 ) . Join( // e2 , x1 => k1 , x2 => k2 , ( x1 , x2 ) => new { x1 , x2 }) // ... var resultSelectorLambda = MakePairLambda(join, state, x1, x2); invocation = MakeQueryInvocation( join, state.fromExpression, "Join", ImmutableArray.Create(inExpression, outerKeySelectorLambda, innerKeySelectorLambda, resultSelectorLambda), diagnostics); } else { // A query expression with a join clause with an into followed by something other than a select clause // from x1 in e1 // join x2 in e2 on k1 equals k2 into g // ... // is translated into // from * in ( e1 ) . GroupJoin( // e2 , x1 => k1 , x2 => k2 , ( x1 , g ) => new { x1 , g }) // ... state.allRangeVariables[x2].Free(); state.allRangeVariables.Remove(x2); var g = state.AddRangeVariable(this, join.Into.Identifier, diagnostics); var resultSelectorLambda = MakePairLambda(join, state, x1, g); invocation = MakeQueryInvocation( join, state.fromExpression, "GroupJoin", ImmutableArray.Create(inExpression, outerKeySelectorLambda, innerKeySelectorLambda, resultSelectorLambda), diagnostics); var arguments = invocation.Arguments; arguments = arguments.SetItem(arguments.Length - 1, MakeQueryClause(join.Into, arguments[arguments.Length - 1], g)); invocation = invocation.Update(invocation.ReceiverOpt, invocation.Method, arguments); } state.fromExpression = MakeQueryClause(join, invocation, x2, invocation, castInvocation); } }
internal BoundExpression BindQuery(QueryExpressionSyntax node, DiagnosticBag diagnostics) { var fromClause = node.FromClause; var boundFromExpression = BindLeftOfPotentialColorColorMemberAccess(fromClause.Expression, diagnostics); // If the from expression is of the type dynamic we can't infer the types for any lambdas that occur in the query. // Only if there are none we could bind the query but we report an error regardless since such queries are not useful. if (boundFromExpression.HasDynamicType()) { diagnostics.Add(ErrorCode.ERR_BadDynamicQuery, fromClause.Expression.Location); boundFromExpression = BadExpression(fromClause.Expression, boundFromExpression); } QueryTranslationState state = new QueryTranslationState(); state.fromExpression = MakeMemberAccessValue(boundFromExpression, diagnostics); var x = state.rangeVariable = state.AddRangeVariable(this, fromClause.Identifier, diagnostics); for (int i = node.Body.Clauses.Count - 1; i >= 0; i--) { state.clauses.Push(node.Body.Clauses[i]); } state.selectOrGroup = node.Body.SelectOrGroup; // A from clause that explicitly specifies a range variable type // from T x in e // is translated into // from x in ( e ) . Cast < T > ( ) BoundExpression cast = null; if (fromClause.Type != null) { var typeRestriction = BindTypeArgument(fromClause.Type, diagnostics); cast = MakeQueryInvocation(fromClause, state.fromExpression, "Cast", fromClause.Type, typeRestriction, diagnostics); state.fromExpression = cast; } state.fromExpression = MakeQueryClause(fromClause, state.fromExpression, x, castInvocation: cast); BoundExpression result = BindQueryInternal1(state, diagnostics); for (QueryContinuationSyntax continuation = node.Body.Continuation; continuation != null; continuation = continuation.Body.Continuation) { // A query expression with a continuation // from ... into x ... // is translated into // from x in ( from ... ) ... state.Clear(); state.fromExpression = result; x = state.rangeVariable = state.AddRangeVariable(this, continuation.Identifier, diagnostics); Debug.Assert(state.clauses.IsEmpty()); var clauses = continuation.Body.Clauses; for (int i = clauses.Count - 1; i >= 0; i--) { state.clauses.Push(clauses[i]); } state.selectOrGroup = continuation.Body.SelectOrGroup; result = BindQueryInternal1(state, diagnostics); result = MakeQueryClause(continuation.Body, result, x); result = MakeQueryClause(continuation, result, x); } state.Free(); return(MakeQueryClause(node, result)); }
void ReduceLet(LetClauseSyntax let, QueryTranslationState state, DiagnosticBag diagnostics) { // A query expression with a let clause // from x in e // let y = f // ... // is translated into // from * in ( e ) . Select ( x => new { x , y = f } ) // ... var x = state.rangeVariable; // We use a slightly different translation strategy. We produce // from * in ( e ) . Select ( x => new Pair<X,Y>(x, f) ) // Where X is the type of x, and Y is the type of the expression f. // Subsequently, x (or members of x, if it is a transparent identifier) // are accessed as TRID.Item1 (or members of that), and y is accessed // as TRID.Item2, where TRID is the compiler-generated identifier used // to represent the transparent identifier in the result. LambdaBodyResolver resolver = (LambdaSymbol lambdaSymbol, ref Binder lambdaBodyBinder, DiagnosticBag d) => { var xExpression = new BoundParameter(let, lambdaSymbol.Parameters[0]) { WasCompilerGenerated = true }; lambdaBodyBinder = new ScopedExpressionBinder(lambdaBodyBinder, let.Expression); var yExpression = lambdaBodyBinder.BindValue(let.Expression, d, BindValueKind.RValue); SourceLocation errorLocation = new SourceLocation(let.SyntaxTree, new TextSpan(let.Identifier.SpanStart, let.Expression.Span.End - let.Identifier.SpanStart)); if (!yExpression.HasAnyErrors && !yExpression.HasExpressionType()) { MessageID id = MessageID.IDS_NULL; if (yExpression.Kind == BoundKind.UnboundLambda) { id = ((UnboundLambda)yExpression).MessageID; } else if (yExpression.Kind == BoundKind.MethodGroup) { id = MessageID.IDS_MethodGroup; } else { Debug.Assert(yExpression.IsLiteralNull(), "How did we successfully bind an expression without a type?"); } Error(d, ErrorCode.ERR_QueryRangeVariableAssignedBadValue, errorLocation, id.Localize()); yExpression = new BoundBadExpression(yExpression.Syntax, LookupResultKind.Empty, ImmutableArray <Symbol> .Empty, ImmutableArray.Create <BoundNode>(yExpression), CreateErrorType()); } else if (!yExpression.HasAnyErrors && yExpression.Type.SpecialType == SpecialType.System_Void) { Error(d, ErrorCode.ERR_QueryRangeVariableAssignedBadValue, errorLocation, yExpression.Type); yExpression = new BoundBadExpression(yExpression.Syntax, LookupResultKind.Empty, ImmutableArray <Symbol> .Empty, ImmutableArray.Create <BoundNode>(yExpression), yExpression.Type); } var construction = MakePair(let, x.Name, xExpression, let.Identifier.ValueText, yExpression, state, d); return(lambdaBodyBinder.CreateBlockFromExpression(lambdaBodyBinder.Locals, construction, let, d)); }; var lambda = MakeQueryUnboundLambda(state.RangeVariableMap(), x, let.Expression, resolver); state.rangeVariable = state.TransparentRangeVariable(this); state.AddTransparentIdentifier(x.Name); var y = state.AddRangeVariable(this, let.Identifier, diagnostics); state.allRangeVariables[y].Add(let.Identifier.ValueText); var invocation = MakeQueryInvocation(let, state.fromExpression, "Select", lambda, diagnostics); state.fromExpression = MakeQueryClause(let, invocation, y, invocation); }
private void ReduceLet(LetClauseSyntax let, QueryTranslationState state, DiagnosticBag diagnostics) { // A query expression with a let clause // from x in e // let y = f // ... // is translated into // from * in ( e ) . Select ( x => new { x , y = f } ) // ... var x = state.rangeVariable; // We use a slightly different translation strategy. We produce // from * in ( e ) . Select ( x => new Pair<X,Y>(x, f) ) // Where X is the type of x, and Y is the type of the expression f. // Subsequently, x (or members of x, if it is a transparent identifier) // are accessed as TRID.Item1 (or members of that), and y is accessed // as TRID.Item2, where TRID is the compiler-generated identifier used // to represent the transparent identifier in the result. LambdaBodyFactory bodyFactory = (LambdaSymbol lambdaSymbol, Binder lambdaBodyBinder, DiagnosticBag d) => { var xExpression = new BoundParameter(let, lambdaSymbol.Parameters[0]) { WasCompilerGenerated = true }; lambdaBodyBinder = lambdaBodyBinder.GetBinder(let.Expression); Debug.Assert(lambdaBodyBinder != null); var yExpression = lambdaBodyBinder.BindValue(let.Expression, d, BindValueKind.RValue); SourceLocation errorLocation = new SourceLocation(let.SyntaxTree, new TextSpan(let.Identifier.SpanStart, let.Expression.Span.End - let.Identifier.SpanStart)); if (!yExpression.HasAnyErrors && !yExpression.HasExpressionType()) { Error(d, ErrorCode.ERR_QueryRangeVariableAssignedBadValue, errorLocation, yExpression.Display); yExpression = new BoundBadExpression(yExpression.Syntax, LookupResultKind.Empty, ImmutableArray<Symbol>.Empty, ImmutableArray.Create<BoundNode>(yExpression), CreateErrorType()); } else if (!yExpression.HasAnyErrors && yExpression.Type.SpecialType == SpecialType.System_Void) { Error(d, ErrorCode.ERR_QueryRangeVariableAssignedBadValue, errorLocation, yExpression.Type); yExpression = new BoundBadExpression(yExpression.Syntax, LookupResultKind.Empty, ImmutableArray<Symbol>.Empty, ImmutableArray.Create<BoundNode>(yExpression), yExpression.Type); } var construction = MakePair(let, x.Name, xExpression, let.Identifier.ValueText, yExpression, state, d); // The bound block represents a closure scope for transparent identifiers captured in the let clause. // Such closures shall be associated with the lambda body expression. return lambdaBodyBinder.CreateBlockFromExpression(let.Expression, lambdaBodyBinder.GetDeclaredLocalsForScope(let.Expression), RefKind.None, construction, null, d); }; var lambda = MakeQueryUnboundLambda(state.RangeVariableMap(), ImmutableArray.Create(x), let.Expression, bodyFactory); state.rangeVariable = state.TransparentRangeVariable(this); state.AddTransparentIdentifier(x.Name); var y = state.AddRangeVariable(this, let.Identifier, diagnostics); state.allRangeVariables[y].Add(let.Identifier.ValueText); var invocation = MakeQueryInvocation(let, state.fromExpression, "Select", lambda, diagnostics); state.fromExpression = MakeQueryClause(let, invocation, y, invocation); }
private void ReduceFrom(FromClauseSyntax from, QueryTranslationState state, DiagnosticBag diagnostics) { var x1 = state.rangeVariable; BoundExpression collectionSelectorLambda; if (from.Type == null) { collectionSelectorLambda = MakeQueryUnboundLambda(state.RangeVariableMap(), x1, from.Expression); } else { collectionSelectorLambda = MakeQueryUnboundLambdaWithCast(state.RangeVariableMap(), x1, from.Expression, from.Type, BindTypeArgument(from.Type, diagnostics)); } var x2 = state.AddRangeVariable(this, from.Identifier, diagnostics); if (state.clauses.IsEmpty() && state.selectOrGroup.IsKind(SyntaxKind.SelectClause)) { var select = (SelectClauseSyntax)state.selectOrGroup; // A query expression with a second from clause followed by a select clause // from x1 in e1 // from x2 in e2 // select v // is translated into // ( e1 ) . SelectMany( x1 => e2 , ( x1 , x2 ) => v ) var resultSelectorLambda = MakeQueryUnboundLambda(state.RangeVariableMap(), ImmutableArray.Create(x1, x2), select.Expression); var invocation = MakeQueryInvocation( from, state.fromExpression, "SelectMany", ImmutableArray.Create(collectionSelectorLambda, resultSelectorLambda), diagnostics); // Adjust the second-to-last parameter to be a query clause (if it was an extension method, an extra parameter was added) BoundExpression castInvocation = (from.Type != null) ? ExtractCastInvocation(invocation) : null; var arguments = invocation.Arguments; invocation = invocation.Update( invocation.ReceiverOpt, invocation.Method, arguments.SetItem(arguments.Length - 2, MakeQueryClause(from, arguments[arguments.Length - 2], x2, invocation, castInvocation))); state.Clear(); state.fromExpression = MakeQueryClause(from, invocation, definedSymbol: x2, queryInvocation: invocation); state.fromExpression = MakeQueryClause(select, state.fromExpression); } else { // A query expression with a second from clause followed by something other than a select clause: // from x1 in e1 // from x2 in e2 // ... // is translated into // from * in ( e1 ) . SelectMany( x1 => e2 , ( x1 , x2 ) => new { x1 , x2 } ) // ... // We use a slightly different translation strategy. We produce // from * in ( e ) . SelectMany ( x1 => e2, ( x1 , x2 ) => new Pair<X1,X2>(x1, x2) ) // Where X1 is the type of x1, and X2 is the type of x2. // Subsequently, x1 (or members of x1, if it is a transparent identifier) // are accessed as TRID.Item1 (or members of that), and x2 is accessed // as TRID.Item2, where TRID is the compiler-generated identifier used // to represent the transparent identifier in the result. var resultSelectorLambda = MakePairLambda(from, state, x1, x2); var invocation = MakeQueryInvocation( from, state.fromExpression, "SelectMany", ImmutableArray.Create(collectionSelectorLambda, resultSelectorLambda), diagnostics); BoundExpression castInvocation = (from.Type != null) ? ExtractCastInvocation(invocation) : null; state.fromExpression = MakeQueryClause(from, invocation, x2, invocation, castInvocation); } }
private void ReduceJoin(JoinClauseSyntax join, QueryTranslationState state, DiagnosticBag diagnostics) { var inExpression = BindValue(join.InExpression, diagnostics, BindValueKind.RValue); // If the from expression is of the type dynamic we can't infer the types for any lambdas that occur in the query. // Only if there are none we could bind the query but we report an error regardless since such queries are not useful. if (inExpression.HasDynamicType()) { diagnostics.Add(ErrorCode.ERR_BadDynamicQuery, join.InExpression.Location); inExpression = BadExpression(join.InExpression, inExpression); } BoundExpression castInvocation = null; if (join.Type != null) { // A join clause that explicitly specifies a range variable type // join T x in e on k1 equals k2 // is translated into // join x in ( e ) . Cast < T > ( ) on k1 equals k2 var castType = BindTypeArgument(join.Type, diagnostics); castInvocation = MakeQueryInvocation(join, inExpression, "Cast", join.Type, castType, diagnostics); inExpression = castInvocation; } var outerKeySelectorLambda = MakeQueryUnboundLambda(state.RangeVariableMap(), state.rangeVariable, join.LeftExpression); var x1 = state.rangeVariable; var x2 = state.AddRangeVariable(this, join.Identifier, diagnostics); var innerKeySelectorLambda = MakeQueryUnboundLambda(QueryTranslationState.RangeVariableMap(x2), x2, join.RightExpression); if (state.clauses.IsEmpty() && state.selectOrGroup.Kind() == SyntaxKind.SelectClause) { var select = state.selectOrGroup as SelectClauseSyntax; BoundCall invocation; if (join.Into == null) { // A query expression with a join clause without an into followed by a select clause // from x1 in e1 // join x2 in e2 on k1 equals k2 // select v // is translated into // ( e1 ) . Join( e2 , x1 => k1 , x2 => k2 , ( x1 , x2 ) => v ) var resultSelectorLambda = MakeQueryUnboundLambda(state.RangeVariableMap(), ImmutableArray.Create(x1, x2), select.Expression); invocation = MakeQueryInvocation( join, state.fromExpression, "Join", ImmutableArray.Create(inExpression, outerKeySelectorLambda, innerKeySelectorLambda, resultSelectorLambda), diagnostics); } else { // A query expression with a join clause with an into followed by a select clause // from x1 in e1 // join x2 in e2 on k1 equals k2 into g // select v // is translated into // ( e1 ) . GroupJoin( e2 , x1 => k1 , x2 => k2 , ( x1 , g ) => v ) state.allRangeVariables[x2].Free(); state.allRangeVariables.Remove(x2); var g = state.AddRangeVariable(this, join.Into.Identifier, diagnostics); var resultSelectorLambda = MakeQueryUnboundLambda(state.RangeVariableMap(), ImmutableArray.Create(x1, g), select.Expression); invocation = MakeQueryInvocation( join, state.fromExpression, "GroupJoin", ImmutableArray.Create(inExpression, outerKeySelectorLambda, innerKeySelectorLambda, resultSelectorLambda), diagnostics); // record the into clause in the bound tree var arguments = invocation.Arguments; arguments = arguments.SetItem(arguments.Length - 1, MakeQueryClause(join.Into, arguments[arguments.Length - 1], g)); invocation = invocation.Update(invocation.ReceiverOpt, invocation.Method, arguments); } state.Clear(); // this completes the whole query state.fromExpression = MakeQueryClause(join, invocation, x2, invocation, castInvocation); state.fromExpression = MakeQueryClause(select, state.fromExpression); } else { BoundCall invocation; if (join.Into == null) { // A query expression with a join clause without an into followed by something other than a select clause // from x1 in e1 // join x2 in e2 on k1 equals k2 // ... // is translated into // from * in ( e1 ) . Join( // e2 , x1 => k1 , x2 => k2 , ( x1 , x2 ) => new { x1 , x2 }) // ... var resultSelectorLambda = MakePairLambda(join, state, x1, x2); invocation = MakeQueryInvocation( join, state.fromExpression, "Join", ImmutableArray.Create(inExpression, outerKeySelectorLambda, innerKeySelectorLambda, resultSelectorLambda), diagnostics); } else { // A query expression with a join clause with an into followed by something other than a select clause // from x1 in e1 // join x2 in e2 on k1 equals k2 into g // ... // is translated into // from * in ( e1 ) . GroupJoin( // e2 , x1 => k1 , x2 => k2 , ( x1 , g ) => new { x1 , g }) // ... state.allRangeVariables[x2].Free(); state.allRangeVariables.Remove(x2); var g = state.AddRangeVariable(this, join.Into.Identifier, diagnostics); var resultSelectorLambda = MakePairLambda(join, state, x1, g); invocation = MakeQueryInvocation( join, state.fromExpression, "GroupJoin", ImmutableArray.Create(inExpression, outerKeySelectorLambda, innerKeySelectorLambda, resultSelectorLambda), diagnostics); var arguments = invocation.Arguments; arguments = arguments.SetItem(arguments.Length - 1, MakeQueryClause(join.Into, arguments[arguments.Length - 1], g)); invocation = invocation.Update(invocation.ReceiverOpt, invocation.Method, arguments); } state.fromExpression = MakeQueryClause(join, invocation, x2, invocation, castInvocation); } }
internal BoundExpression BindQuery(QueryExpressionSyntax node, DiagnosticBag diagnostics) { var fromClause = node.FromClause; var boundFromExpression = BindLeftOfPotentialColorColorMemberAccess(fromClause.Expression, diagnostics); // If the from expression is of the type dynamic we can't infer the types for any lambdas that occur in the query. // Only if there are none we could bind the query but we report an error regardless since such queries are not useful. if (boundFromExpression.HasDynamicType()) { diagnostics.Add(ErrorCode.ERR_BadDynamicQuery, fromClause.Expression.Location); boundFromExpression = BadExpression(fromClause.Expression, boundFromExpression); } QueryTranslationState state = new QueryTranslationState(); state.fromExpression = MakeMemberAccessValue(boundFromExpression, diagnostics); var x = state.rangeVariable = state.AddRangeVariable(this, fromClause.Identifier, diagnostics); for (int i = node.Body.Clauses.Count - 1; i >= 0; i--) { state.clauses.Push(node.Body.Clauses[i]); } state.selectOrGroup = node.Body.SelectOrGroup; // A from clause that explicitly specifies a range variable type // from T x in e // is translated into // from x in ( e ) . Cast < T > ( ) BoundExpression cast = null; if (fromClause.Type != null) { var typeRestriction = BindTypeArgument(fromClause.Type, diagnostics); cast = MakeQueryInvocation(fromClause, state.fromExpression, "Cast", fromClause.Type, typeRestriction, diagnostics); state.fromExpression = cast; } state.fromExpression = MakeQueryClause(fromClause, state.fromExpression, x, castInvocation: cast); BoundExpression result = BindQueryInternal1(state, diagnostics); for (QueryContinuationSyntax continuation = node.Body.Continuation; continuation != null; continuation = continuation.Body.Continuation) { // A query expression with a continuation // from ... into x ... // is translated into // from x in ( from ... ) ... state.Clear(); state.fromExpression = result; x = state.rangeVariable = state.AddRangeVariable(this, continuation.Identifier, diagnostics); Debug.Assert(state.clauses.IsEmpty()); var clauses = continuation.Body.Clauses; for (int i = clauses.Count - 1; i >= 0; i--) { state.clauses.Push(clauses[i]); } state.selectOrGroup = continuation.Body.SelectOrGroup; result = BindQueryInternal1(state, diagnostics); result = MakeQueryClause(continuation.Body, result, x); result = MakeQueryClause(continuation, result, x); } state.Free(); return MakeQueryClause(node, result); }
private void ReduceLet(LetClauseSyntax let, QueryTranslationState state, DiagnosticBag diagnostics) { // A query expression with a let clause // from x in e // let y = f // ... // is translated into // from * in ( e ) . Select ( x => new { x , y = f } ) // ... var x = state.rangeVariable; // We use a slightly different translation strategy. We produce // from * in ( e ) . Select ( x => new Pair<X,Y>(x, f) ) // Where X is the type of x, and Y is the type of the expression f. // Subsequently, x (or members of x, if it is a transparent identifier) // are accessed as TRID.Item1 (or members of that), and y is accessed // as TRID.Item2, where TRID is the compiler-generated identifier used // to represent the transparent identifier in the result. LambdaBodyFactory bodyFactory = (LambdaSymbol lambdaSymbol, ref Binder lambdaBodyBinder, DiagnosticBag d) => { var xExpression = new BoundParameter(let, lambdaSymbol.Parameters[0]) { WasCompilerGenerated = true }; var yExpression = lambdaBodyBinder.BindValue(let.Expression, d, BindValueKind.RValue); SourceLocation errorLocation = new SourceLocation(let.SyntaxTree, new TextSpan(let.Identifier.SpanStart, let.Expression.Span.End - let.Identifier.SpanStart)); if (!yExpression.HasAnyErrors && !yExpression.HasExpressionType()) { MessageID id = MessageID.IDS_NULL; if (yExpression.Kind == BoundKind.UnboundLambda) { id = ((UnboundLambda)yExpression).MessageID; } else if (yExpression.Kind == BoundKind.MethodGroup) { id = MessageID.IDS_MethodGroup; } else { Debug.Assert(yExpression.IsLiteralNull(), "How did we successfully bind an expression without a type?"); } Error(d, ErrorCode.ERR_QueryRangeVariableAssignedBadValue, errorLocation, id.Localize()); yExpression = new BoundBadExpression(yExpression.Syntax, LookupResultKind.Empty, ImmutableArray<Symbol>.Empty, ImmutableArray.Create<BoundNode>(yExpression), CreateErrorType()); } else if (!yExpression.HasAnyErrors && yExpression.Type.SpecialType == SpecialType.System_Void) { Error(d, ErrorCode.ERR_QueryRangeVariableAssignedBadValue, errorLocation, yExpression.Type); yExpression = new BoundBadExpression(yExpression.Syntax, LookupResultKind.Empty, ImmutableArray<Symbol>.Empty, ImmutableArray.Create<BoundNode>(yExpression), yExpression.Type); } var construction = MakePair(let, x.Name, xExpression, let.Identifier.ValueText, yExpression, state, d); return lambdaBodyBinder.CreateBlockFromExpression(let, lambdaBodyBinder.Locals, null, construction, d); }; var lambda = MakeQueryUnboundLambda(state.RangeVariableMap(), ImmutableArray.Create(x), let.Expression, bodyFactory); state.rangeVariable = state.TransparentRangeVariable(this); state.AddTransparentIdentifier(x.Name); var y = state.AddRangeVariable(this, let.Identifier, diagnostics); state.allRangeVariables[y].Add(let.Identifier.ValueText); var invocation = MakeQueryInvocation(let, state.fromExpression, "Select", lambda, diagnostics); state.fromExpression = MakeQueryClause(let, invocation, y, invocation); }