private static bool CheckForSimpleLocalDeclarationPattern(
AnonymousFunctionExpressionSyntax anonymousFunction,
out LocalDeclarationStatementSyntax localDeclaration
)
{
// Type t = <anonymous function>
if (
anonymousFunction.IsParentKind(SyntaxKind.EqualsValueClause) &&
anonymousFunction.Parent.IsParentKind(SyntaxKind.VariableDeclarator) &&
anonymousFunction.Parent.Parent.IsParentKind(SyntaxKind.VariableDeclaration) &&
anonymousFunction.Parent.Parent.Parent.IsParentKind(
SyntaxKind.LocalDeclarationStatement,
out localDeclaration
)
)
{
if (!localDeclaration.Declaration.Type.IsVar)
{
return(true);
}
}
localDeclaration = null;
return(false);
}
private bool CheckForLocalDeclarationAndAssignment(
SemanticModel semanticModel,
AnonymousFunctionExpressionSyntax anonymousFunction,
CancellationToken cancellationToken,
out LocalDeclarationStatementSyntax localDeclaration)
{
// Type t = null;
// t = <anonymous function>
if (anonymousFunction.IsParentKind(SyntaxKind.SimpleAssignmentExpression) &&
anonymousFunction.Parent.IsParentKind(SyntaxKind.ExpressionStatement) &&
anonymousFunction.Parent.Parent.IsParentKind(SyntaxKind.Block))
{
var assignment = (AssignmentExpressionSyntax)anonymousFunction.Parent;
if (assignment.Left.IsKind(SyntaxKind.IdentifierName))
{
var expressionStatement = (ExpressionStatementSyntax)assignment.Parent;
var block = (BlockSyntax)expressionStatement.Parent;
var expressionStatementIndex = block.Statements.IndexOf(expressionStatement);
if (expressionStatementIndex >= 1)
{
var previousStatement = block.Statements[expressionStatementIndex - 1];
if (previousStatement.IsKind(SyntaxKind.LocalDeclarationStatement))
{
localDeclaration = (LocalDeclarationStatementSyntax)previousStatement;
if (localDeclaration.Declaration.Variables.Count == 1)
{
var variableDeclarator = localDeclaration.Declaration.Variables[0];
if (variableDeclarator.Initializer != null)
{
var value = variableDeclarator.Initializer.Value;
if (value.IsKind(SyntaxKind.NullLiteralExpression) ||
value.IsKind(SyntaxKind.DefaultLiteralExpression) ||
value.IsKind(SyntaxKind.DefaultExpression))
{
var identifierName = (IdentifierNameSyntax)assignment.Left;
if (variableDeclarator.Identifier.ValueText == identifierName.Identifier.ValueText)
{
return(true);
}
}
}
}
}
}
}
}
localDeclaration = null;
return(false);
}
private bool CheckForSimpleLocalDeclarationPattern(
SemanticModel semanticModel,
AnonymousFunctionExpressionSyntax anonymousFunction,
CancellationToken cancellationToken,
out LocalDeclarationStatementSyntax localDeclaration)
{
// Type t = <anonymous function>
if (anonymousFunction.IsParentKind(SyntaxKind.EqualsValueClause) &&
anonymousFunction.Parent.IsParentKind(SyntaxKind.VariableDeclarator) &&
anonymousFunction.Parent.Parent.IsParentKind(SyntaxKind.VariableDeclaration) &&
anonymousFunction.Parent.Parent.Parent.IsParentKind(SyntaxKind.LocalDeclarationStatement))
{
localDeclaration = (LocalDeclarationStatementSyntax)anonymousFunction.Parent.Parent.Parent.Parent;
if (!localDeclaration.Declaration.Type.IsVar)
{
return(true);
}
}
localDeclaration = null;
return(false);
}