public bool AreEquivalent(SyntaxTree oldTree, SyntaxTree newTree)
{
return(SyntaxFactory.AreEquivalent(oldTree, newTree, topLevel: false));
}
internal static bool ParseIfStatement(IfStatementSyntax node, out ExpressionSyntax condition, out ExpressionSyntax target, out AssignmentExpressionSyntax whenTrue, out AssignmentExpressionSyntax whenFalse)
{
condition = null;
target = null;
whenTrue = null;
whenFalse = null;
if (node == null || node.Else == null || node.Parent is IfStatementSyntax || node.Else.Statement is IfStatementSyntax)
{
return(false);
}
condition = node.Condition;
//make sure to check for multiple statements
ExpressionStatementSyntax whenTrueExprStatement, whenFalseExprStatement;
var embeddedBlock = node.Statement as BlockSyntax;
if (embeddedBlock != null)
{
if (embeddedBlock.Statements.Count > 1)
{
return(false);
}
var childNodes = embeddedBlock.ChildNodes();
if (childNodes.Count() > 1)
{
return(false);
}
whenTrueExprStatement = childNodes.OfType <ExpressionStatementSyntax>().FirstOrDefault();
}
else
{
whenTrueExprStatement = node.Statement as ExpressionStatementSyntax;
}
var elseBlock = node.Else.Statement as BlockSyntax;
if (elseBlock != null)
{
if (elseBlock.Statements.Count > 1)
{
return(false);
}
var childNodes = elseBlock.ChildNodes();
if (childNodes.Count() > 1)
{
return(false);
}
whenFalseExprStatement = childNodes.OfType <ExpressionStatementSyntax>().FirstOrDefault();
}
else
{
whenFalseExprStatement = node.Else.Statement as ExpressionStatementSyntax;
}
if (whenTrueExprStatement == null || whenFalseExprStatement == null)
{
return(false);
}
whenTrue = whenTrueExprStatement.Expression as AssignmentExpressionSyntax;
whenFalse = whenFalseExprStatement.Expression as AssignmentExpressionSyntax;
if (whenTrue == null || whenFalse == null || whenTrue.Kind() != whenFalse.Kind() ||
!SyntaxFactory.AreEquivalent(whenTrue.Left, whenFalse.Left))
{
return(false);
}
return(true);
}
private bool Equal(SwitchSectionSyntax left, SwitchSectionSyntax right)
{
return(SyntaxFactory.AreEquivalent(left.Labels, right.Labels, null) &&
SyntaxFactory.AreEquivalent(left.Statements, right.Statements, ignoreChildNode: IgnoreLabeledChild));
}
protected override bool AreEquivalent(CaseBlockSyntax section1, CaseBlockSyntax section2) => SyntaxFactory.AreEquivalent(section1.Statements, section2.Statements);
private static bool IsMidLevelExpression(BinaryExpressionSyntax binaryExpression)
{
return(binaryExpression.Parent is BinaryExpressionSyntax binaryParent &&
SyntaxFactory.AreEquivalent(binaryExpression.OperatorToken, binaryParent.OperatorToken));
}
protected override bool AreEquivalent(SwitchSectionSyntax section1, SwitchSectionSyntax section2) => SyntaxFactory.AreEquivalent(section1.Statements, section2.Statements);
protected override bool Equals(SyntaxNode oldElement, SyntaxNode newElement) => SyntaxFactory.AreEquivalent(oldElement, newElement);
protected override bool AreEquivalent(SyntaxNode node1, SyntaxNode node2) => SyntaxFactory.AreEquivalent(node1, node2);
public bool TryGetPatternPieces(
BinaryExpressionSyntax isExpression,
out IfStatementSyntax ifStatement,
out LocalDeclarationStatementSyntax localDeclarationStatement,
out VariableDeclaratorSyntax declarator,
out CastExpressionSyntax castExpression)
{
ifStatement = null;
localDeclarationStatement = null;
declarator = null;
castExpression = null;
// The is check has to be in an if check: "if (x is Type)
if (!isExpression.Parent.IsKind(SyntaxKind.IfStatement, out ifStatement))
{
return(false);
}
if (!ifStatement.Statement.IsKind(SyntaxKind.Block, out BlockSyntax ifBlock))
{
return(false);
}
if (ifBlock.Statements.Count == 0)
{
return(false);
}
var firstStatement = ifBlock.Statements[0];
if (!firstStatement.IsKind(SyntaxKind.LocalDeclarationStatement, out localDeclarationStatement))
{
return(false);
}
if (localDeclarationStatement.Declaration.Variables.Count != 1)
{
return(false);
}
declarator = localDeclarationStatement.Declaration.Variables[0];
if (declarator.Initializer == null)
{
return(false);
}
var declaratorValue = declarator.Initializer.Value.WalkDownParentheses();
if (!declaratorValue.IsKind(SyntaxKind.CastExpression, out castExpression))
{
return(false);
}
if (!SyntaxFactory.AreEquivalent(isExpression.Left.WalkDownParentheses(), castExpression.Expression.WalkDownParentheses(), topLevel: false) ||
!SyntaxFactory.AreEquivalent(isExpression.Right.WalkDownParentheses(), castExpression.Type, topLevel: false))
{
return(false);
}
return(true);
}
public static bool AreEquivalent(SyntaxList <SyntaxNode> nodeList1, SyntaxList <SyntaxNode> nodeList2)
{
return(Common.EquivalenceChecker.AreEquivalent(nodeList1, nodeList2,
(n1, n2) => SyntaxFactory.AreEquivalent(n1, n2)));
}
