public static ITypeSymbol GetTypeSymbol(
this SemanticModel semanticModel,
SelectOrGroupClauseSyntax selectOrGroupClause,
CancellationToken cancellationToken = default(CancellationToken))
{
return(semanticModel
.GetTypeInfo(selectOrGroupClause, cancellationToken)
.Type);
}
public static ITypeSymbol GetTypeSymbol(
this SemanticModel semanticModel,
SelectOrGroupClauseSyntax selectOrGroupClause,
CancellationToken cancellationToken = default(CancellationToken))
{
return(Microsoft.CodeAnalysis.CSharp.CSharpExtensions
.GetTypeInfo(semanticModel, selectOrGroupClause, cancellationToken)
.Type);
}
public override void AddChildren()
{
Kind = Node.Kind();
_clauses = ((QueryBodySyntax)Node).Clauses;
_clausesIsChanged = false;
_clausesCount = _clauses.Count;
_selectOrGroup = ((QueryBodySyntax)Node).SelectOrGroup;
_selectOrGroupIsChanged = false;
_continuation = ((QueryBodySyntax)Node).Continuation;
_continuationIsChanged = false;
}
public void Clear()
{
fromExpression = null;
rangeVariable = null;
selectOrGroup = null;
foreach (var b in allRangeVariables.Values)
{
b.Free();
}
allRangeVariables.Clear();
clauses.Clear();
}
private QueryClause VisitTerminationClause(SelectOrGroupClauseSyntax node)
{
if (node is SelectClauseSyntax select)
{
return(Expressive.Select(Visit(select.Expression)));
}
if (node is GroupClauseSyntax group)
{
return(Expressive.GroupBy(null, Visit(group.GroupExpression)));
}
throw new ArgumentException();
}
private static void HandleSelectOrGroup(SelectOrGroupClauseSyntax selectOrGroup, List <SyntaxToken> tokensToCheck)
{
switch (selectOrGroup.Kind())
{
case SyntaxKind.SelectClause:
var selectClause = (SelectClauseSyntax)selectOrGroup;
tokensToCheck.Add(selectClause.SelectKeyword);
break;
case SyntaxKind.GroupClause:
var groupClause = (GroupClauseSyntax)selectOrGroup;
tokensToCheck.Add(groupClause.GroupKeyword);
break;
}
}
/// <summary>
/// When queries are translated into expressions select and group-by expressions such that
/// 1) select/group-by expression is the same identifier as the "source" identifier and
/// 2) at least one Where or OrderBy clause but no other clause is present in the contained query body or
/// the expression in question is a group-by expression and the body has no clause
///
/// do not translate into lambdas.
/// By "source" identifier we mean the identifier specified in the from clause that initiates the query or the query continuation that includes the body.
///
/// The above condition can be derived from the language specification (chapter 7.16.2) as follows:
/// - In order for 7.16.2.5 "Select clauses" to be applicable the following conditions must hold:
/// - There has to be at least one clause in the body, otherwise the query is reduced into a final form by 7.16.2.3 "Degenerate query expressions".
/// - Only where and order-by clauses may be present in the query body, otherwise a transformation in 7.16.2.4 "From, let, where, join and orderby clauses"
/// produces pattern that doesn't match the requirements of 7.16.2.5.
///
/// - In order for 7.16.2.6 "Groupby clauses" to be applicable the following conditions must hold:
/// - Only where and order-by clauses may be present in the query body, otherwise a transformation in 7.16.2.4 "From, let, where, join and orderby clauses"
/// produces pattern that doesn't match the requirements of 7.16.2.5.
/// </summary>
private static bool IsReducedSelectOrGroupByClause(SelectOrGroupClauseSyntax selectOrGroupClause, ExpressionSyntax selectOrGroupExpression)
{
if (!selectOrGroupExpression.IsKind(SyntaxKind.IdentifierName))
{
return(false);
}
var selectorIdentifier = ((IdentifierNameSyntax)selectOrGroupExpression).Identifier;
SyntaxToken sourceIdentifier;
QueryBodySyntax containingBody;
var containingQueryOrContinuation = selectOrGroupClause.Parent.Parent;
if (containingQueryOrContinuation.IsKind(SyntaxKind.QueryExpression))
{
var containingQuery = (QueryExpressionSyntax)containingQueryOrContinuation;
containingBody = containingQuery.Body;
sourceIdentifier = containingQuery.FromClause.Identifier;
}
else
{
var containingContinuation = (QueryContinuationSyntax)containingQueryOrContinuation;
sourceIdentifier = containingContinuation.Identifier;
containingBody = containingContinuation.Body;
}
if (!SyntaxFactory.AreEquivalent(sourceIdentifier, selectorIdentifier))
{
return(false);
}
if (selectOrGroupClause.IsKind(SyntaxKind.SelectClause) && containingBody.Clauses.Count == 0)
{
return(false);
}
foreach (var clause in containingBody.Clauses)
{
if (!clause.IsKind(SyntaxKind.WhereClause) && !clause.IsKind(SyntaxKind.OrderByClause))
{
return(false);
}
}
return(true);
}
public override TypeInfo GetTypeInfo(SelectOrGroupClauseSyntax node, CancellationToken cancellationToken = default(CancellationToken))
{
var bound = GetBoundQueryClause(node);
return GetTypeInfoForQuery(bound);
}
public abstract TypeInfo GetTypeInfo(SelectOrGroupClauseSyntax node, CancellationToken cancellationToken = default(CancellationToken));
private static bool ProjectsIntoAnynomousType([NotNull] SelectOrGroupClauseSyntax selectOrGroupClause)
{
return(selectOrGroupClause is SelectClauseSyntax selectClause &&
selectClause.Expression is AnonymousObjectCreationExpressionSyntax);
}
private static bool ProjectsIntoGroup([NotNull] SelectOrGroupClauseSyntax selectOrGroupClause)
{
return(selectOrGroupClause is GroupClauseSyntax);
}
public SymbolInfo GetSymbolInfo(SelectOrGroupClauseSyntax node,
CancellationToken cancellationToken = default(CancellationToken))
{
return GetSemanticModel(node).GetSymbolInfo(node, cancellationToken);
}
public TameSelectOrGroupClauseSyntax(SelectOrGroupClauseSyntax node)
{
Node = node;
AddChildren();
}
public void Clear()
{
fromExpression = null;
rangeVariable = null;
selectOrGroup = null;
foreach (var b in allRangeVariables.Values) b.Free();
allRangeVariables.Clear();
clauses.Clear();
}
/// <summary>
/// When queries are translated into expressions select and group-by expressions such that
/// 1) select/group-by expression is the same identifier as the "source" identifier and
/// 2) at least one Where or OrderBy clause but no other clause is present in the contained query body or
/// the expression in question is a group-by expression and the body has no clause
///
/// do not translate into lambdas.
/// By "source" identifier we mean the identifier specified in the from clause that initiates the query or the query continuation that includes the body.
///
/// The above condition can be derived from the language specification (chapter 7.16.2) as follows:
/// - In order for 7.16.2.5 "Select clauses" to be applicable the following conditions must hold:
/// - There has to be at least one clause in the body, otherwise the query is reduced into a final form by 7.16.2.3 "Degenerate query expressions".
/// - Only where and order-by clauses may be present in the query body, otherwise a transformation in 7.16.2.4 "From, let, where, join and orderby clauses"
/// produces pattern that doesn't match the requirements of 7.16.2.5.
///
/// - In order for 7.16.2.6 "Groupby clauses" to be applicable the following conditions must hold:
/// - Only where and order-by clauses may be present in the query body, otherwise a transformation in 7.16.2.4 "From, let, where, join and orderby clauses"
/// produces pattern that doesn't match the requirements of 7.16.2.5.
/// </summary>
private static bool IsReducedSelectOrGroupByClause(SelectOrGroupClauseSyntax selectOrGroupClause, ExpressionSyntax selectOrGroupExpression)
{
if (!selectOrGroupExpression.IsKind(SyntaxKind.IdentifierName))
{
return false;
}
var selectorIdentifier = ((IdentifierNameSyntax)selectOrGroupExpression).Identifier;
SyntaxToken sourceIdentifier;
QueryBodySyntax containingBody;
var containingQueryOrContinuation = selectOrGroupClause.Parent.Parent;
if (containingQueryOrContinuation.IsKind(SyntaxKind.QueryExpression))
{
var containingQuery = (QueryExpressionSyntax)containingQueryOrContinuation;
containingBody = containingQuery.Body;
sourceIdentifier = containingQuery.FromClause.Identifier;
}
else
{
var containingContinuation = (QueryContinuationSyntax)containingQueryOrContinuation;
sourceIdentifier = containingContinuation.Identifier;
containingBody = containingContinuation.Body;
}
if (!SyntaxFactory.AreEquivalent(sourceIdentifier, selectorIdentifier))
{
return false;
}
if (selectOrGroupClause.IsKind(SyntaxKind.SelectClause) && containingBody.Clauses.Count == 0)
{
return false;
}
foreach (var clause in containingBody.Clauses)
{
if (!clause.IsKind(SyntaxKind.WhereClause) && !clause.IsKind(SyntaxKind.OrderByClause))
{
return false;
}
}
return true;
}
public override TypeInfo GetTypeInfo(SelectOrGroupClauseSyntax node, CancellationToken cancellationToken = default(CancellationToken))
{
using (Logger.LogBlock(FunctionId.CSharp_SemanticModel_GetTypeInfo, message: this.SyntaxTree.FilePath, cancellationToken: cancellationToken))
{
CheckSyntaxNode(node);
var model = this.GetMemberModel(node);
return (model == null) ? default(TypeInfo) : model.GetTypeInfo(node, cancellationToken);
}
}
public override TypeInfo GetTypeInfo(SelectOrGroupClauseSyntax node, CancellationToken cancellationToken = default(CancellationToken))
{
CheckSyntaxNode(node);
var model = this.GetMemberModel(node);
return (model == null) ? default(TypeInfo) : model.GetTypeInfo(node, cancellationToken);
}
private static void HandleSelectOrGroup(SelectOrGroupClauseSyntax selectOrGroup, List<SyntaxToken> tokensToCheck)
{
switch (selectOrGroup.Kind())
{
case SyntaxKind.SelectClause:
var selectClause = (SelectClauseSyntax)selectOrGroup;
tokensToCheck.Add(selectClause.SelectKeyword);
break;
case SyntaxKind.GroupClause:
var groupClause = (GroupClauseSyntax)selectOrGroup;
tokensToCheck.Add(groupClause.GroupKeyword);
break;
}
}