// methodsWithYields will contain all function-declaration-like CSharpSyntaxNodes with yield statements contained within them.
// Currently the types of these are restricted to only be whatever the syntax parameter is, plus any LocalFunctionStatementSyntax contained within it.
// This may change if the language is extended to allow iterator lambdas, in which case the lambda would also be returned.
// (lambdas currently throw a diagnostic in WithLambdaParametersBinder.GetIteratorElementType when a yield is used within them)
public static SmallDictionary<CSharpSyntaxNode, Binder> BuildMap(Symbol containingMemberOrLambda, CSharpSyntaxNode syntax, Binder enclosing, ArrayBuilder<CSharpSyntaxNode> methodsWithYields)
{
var builder = new LocalBinderFactory(containingMemberOrLambda, syntax, enclosing, methodsWithYields);
if (syntax is ExpressionSyntax)
{
var binder = new PatternVariableBinder(syntax, enclosing);
builder.AddToMap(syntax, binder);
builder.Visit(syntax, binder);
}
else
{
builder.Visit(syntax);
}
// the other place this is possible is in a local function
if (builder._sawYield)
methodsWithYields.Add(syntax);
return builder._map;
}
// methodsWithYields will contain all function-declaration-like CSharpSyntaxNodes with yield statements contained within them.
// Currently the types of these are restricted to only be whatever the syntax parameter is, plus any LocalFunctionStatementSyntax contained within it.
// This may change if the language is extended to allow iterator lambdas, in which case the lambda would also be returned.
// (lambdas currently throw a diagnostic in WithLambdaParametersBinder.GetIteratorElementType when a yield is used within them)
public static SmallDictionary <CSharpSyntaxNode, Binder> BuildMap(Symbol containingMemberOrLambda, CSharpSyntaxNode syntax, Binder enclosing, ArrayBuilder <CSharpSyntaxNode> methodsWithYields)
{
var builder = new LocalBinderFactory(containingMemberOrLambda, syntax, enclosing, methodsWithYields);
if (syntax is ExpressionSyntax)
{
var binder = new PatternVariableBinder(syntax, enclosing);
builder.AddToMap(syntax, binder);
builder.Visit(syntax, binder);
}
else
{
builder.Visit(syntax);
}
// the other place this is possible is in a local function
if (builder._sawYield)
{
methodsWithYields.Add(syntax);
}
return(builder._map);
}
public override void VisitSwitchSection(SwitchSectionSyntax node)
{
var patternBinder = new PatternVariableBinder(node, _enclosing);
AddToMap(node, patternBinder);
foreach (var label in node.Labels)
{
var match = label as CasePatternSwitchLabelSyntax;
if (match != null)
{
Visit(match.Pattern, patternBinder);
if (match.WhenClause != null)
{
Visit(match.WhenClause.Condition, patternBinder);
}
}
}
foreach (StatementSyntax statement in node.Statements)
{
Visit(statement, patternBinder);
}
}
public override void VisitIfStatement(IfStatementSyntax node)
{
var ifBinder = new PatternVariableBinder(node.Condition, _enclosing);
AddToMap(node.Condition, ifBinder);
Visit(node.Condition, ifBinder);
VisitPossibleEmbeddedStatement(node.Statement, ifBinder);
// pattern variables from the condition are not in scope within the else clause
if (node.Else != null) AddToMap(node.Else.Statement, _enclosing);
Visit(node.Else, _enclosing);
}
public override void VisitSwitchSection(SwitchSectionSyntax node)
{
var patternBinder = new PatternVariableBinder(node, _enclosing);
AddToMap(node, patternBinder);
foreach (var label in node.Labels)
{
var match = label as CasePatternSwitchLabelSyntax;
if (match != null)
{
Visit(match.Pattern, patternBinder);
if (match.WhenClause != null)
{
Visit(match.WhenClause.Condition, patternBinder);
}
}
}
foreach (StatementSyntax statement in node.Statements)
{
Visit(statement, patternBinder);
}
}
public override void VisitSwitchStatement(SwitchStatementSyntax node)
{
Debug.Assert((object)_containingMemberOrLambda == _enclosing.ContainingMemberOrLambda);
var patternBinder = new PatternVariableBinder(node.Expression, _enclosing);
AddToMap(node.Expression, patternBinder);
Visit(node.Expression, patternBinder);
var switchBinder = new SwitchBinder(patternBinder, node);
AddToMap(node, switchBinder);
foreach (SwitchSectionSyntax section in node.Sections)
{
Visit(section, switchBinder);
}
}
public override void VisitLockStatement(LockStatementSyntax node)
{
var patternBinder = new PatternVariableBinder(node, _enclosing);
var lockBinder = new LockBinder(patternBinder, node);
AddToMap(node, lockBinder);
Visit(node.Expression, lockBinder);
StatementSyntax statement = node.Statement;
var statementBinder = lockBinder.WithAdditionalFlags(BinderFlags.InLockBody);
if (statementBinder != lockBinder)
{
AddToMap(statement, statementBinder);
}
VisitPossibleEmbeddedStatement(statement, statementBinder);
}
public override void VisitForEachStatement(ForEachStatementSyntax node)
{
Debug.Assert((object)_containingMemberOrLambda == _enclosing.ContainingMemberOrLambda);
var patternBinder = new PatternVariableBinder(node.Expression, _enclosing);
AddToMap(node.Expression, patternBinder);
Visit(node.Expression, patternBinder);
var binder = new ForEachLoopBinder(patternBinder, node);
AddToMap(node, binder);
VisitPossibleEmbeddedStatement(node.Statement, binder);
}
public override void VisitArgumentList(ArgumentListSyntax node)
{
if (_root == node)
{
// We are supposed to get here only for constructor initializers
Debug.Assert(node.Parent is ConstructorInitializerSyntax);
var argBinder = new PatternVariableBinder(node, _enclosing);
AddToMap(node, argBinder);
foreach (var arg in node.Arguments)
{
Visit(arg.Expression, argBinder);
}
}
else
{
base.VisitArgumentList(node);
}
}
public override void VisitAttribute(AttributeSyntax node)
{
var attrBinder = new PatternVariableBinder(node, _enclosing);
AddToMap(node, attrBinder);
if (node.ArgumentList?.Arguments.Count > 0)
{
foreach (var argument in node.ArgumentList.Arguments)
{
Visit(argument.Expression, attrBinder);
}
}
}
public override void VisitEqualsValueClause(EqualsValueClauseSyntax node)
{
var valueBinder = new PatternVariableBinder(node, _enclosing);
AddToMap(node, valueBinder);
Visit(node.Value, valueBinder);
}
public override void VisitArrowExpressionClause(ArrowExpressionClauseSyntax node)
{
var arrowBinder = new PatternVariableBinder(node, _enclosing);
AddToMap(node, arrowBinder);
Visit(node.Expression, arrowBinder);
}
private void VisitLambdaExpression(LambdaExpressionSyntax node)
{
// Do not descend into a lambda unless it is a root node
if (_root != node)
{
return;
}
CSharpSyntaxNode body = node.Body;
if (body.Kind() == SyntaxKind.Block)
{
VisitBlock((BlockSyntax)body);
}
else
{
var binder = new PatternVariableBinder(body, _enclosing);
AddToMap(body, binder);
Visit(body, binder);
}
}
public override void VisitLocalDeclarationStatement(LocalDeclarationStatementSyntax node)
{
var patternBinder = new PatternVariableBinder(node, _enclosing);
AddToMap(node, patternBinder);
foreach (var decl in node.Declaration.Variables)
{
var value = decl.Initializer?.Value;
if (value != null)
{
Visit(value, patternBinder);
}
}
}
public override void VisitDoStatement(DoStatementSyntax node)
{
Debug.Assert((object)_containingMemberOrLambda == _enclosing.ContainingMemberOrLambda);
var patternBinder = new PatternVariableBinder(node, _enclosing);
var whileBinder = new WhileBinder(patternBinder, node);
AddToMap(node, whileBinder);
Visit(node.Condition, whileBinder);
VisitPossibleEmbeddedStatement(node.Statement, whileBinder);
}
public override void VisitThrowStatement(ThrowStatementSyntax node)
{
if (node.Expression != null)
{
var patternBinder = new PatternVariableBinder(node, _enclosing);
AddToMap(node, patternBinder);
Visit(node.Expression, patternBinder);
}
}
public override void VisitDeconstructionDeclarationStatement(DeconstructionDeclarationStatementSyntax node)
{
var patternBinder = new PatternVariableBinder(node, _enclosing);
AddToMap(node, patternBinder);
Visit(node.Assignment.Value, patternBinder);
}