public static IStatement FindStatement(IStatementContainer container, Func <IStatement, bool> filter)
{
// Climb through the statement tree if the container has a parent
if (container is IStatement statement && statement.Parent != null)
{
var res = FindStatement(statement.Parent, filter);
if (res != null)
{
return(res);
}
}
// Loop through the container and see if any statements match against the filter
foreach (var s in container.Statements)
{
if (filter(s))
{
return(s);
}
// Search the statement if its an inner container
if (!(s is IStatementContainer x))
{
continue;
}
var res = FindStatement(x, filter);
if (res != null)
{
return(res);
}
}
return(null);
}
public IfStatement(IStatementContainer parent)
{
Parent = parent;
Statements = new ReadOnlyCollection <IStatement>(_statements);
Expressions = new ReadOnlyCollection <IExpression>(_expressions);
}
private static Task <Document> RefactorAsync(
Document document,
IfStatementSyntax ifStatement,
ReturnStatementSyntax returnStatement,
IStatementContainer container,
CancellationToken cancellationToken)
{
SyntaxList <StatementSyntax> statements = container.Statements;
IfStatement ifElse = IfStatement.Create(ifStatement);
StatementSyntax statement = returnStatement;
if (ifElse.Nodes.Any(f => f.Statement?.IsKind(SyntaxKind.Block) == true))
{
statement = SyntaxFactory.Block(statement);
}
ElseClauseSyntax elseClause = SyntaxFactory.ElseClause(statement).WithFormatterAnnotation();
IfStatementSyntax lastIfStatement = ifElse.Nodes.Last();
IfStatementSyntax newIfStatement = ifStatement.ReplaceNode(
lastIfStatement,
lastIfStatement.WithElse(elseClause));
SyntaxList <StatementSyntax> newStatements = statements
.Replace(ifStatement, newIfStatement)
.RemoveAt(statements.IndexOf(returnStatement));
return(document.ReplaceNodeAsync(container.Node, container.NodeWithStatements(newStatements), cancellationToken));
}
public override async Task <Document> RefactorAsync(Document document, CancellationToken cancellationToken)
{
IStatementContainer container = StatementContainer.Create(IfStatement);
SyntaxList <StatementSyntax> statements = container.Statements;
int index = statements.IndexOf(IfStatement);
ExpressionSyntax left = Left.WithoutTrivia();
ExpressionSyntax right = Right.WithoutTrivia();
SemanticModel semanticModel = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
right = AddCastExpressionIfNecessary(right, semanticModel, IfStatement.SpanStart, cancellationToken);
StatementSyntax newNode = CreateStatement(
CoalesceExpression(
left.Parenthesize().WithSimplifierAnnotation(),
right.Parenthesize().WithSimplifierAnnotation()));
newNode = newNode
.WithLeadingTrivia(IfStatement.GetLeadingTrivia())
.WithTrailingTrivia(statements[index + 1].GetTrailingTrivia())
.WithFormatterAnnotation();
SyntaxList <StatementSyntax> newStatements = statements
.RemoveAt(index)
.ReplaceAt(index, newNode);
return(await document.ReplaceNodeAsync(container.Node, container.NodeWithStatements(newStatements), cancellationToken).ConfigureAwait(false));
}
public static bool TryCreate(StatementSyntax statement, out IStatementContainer container)
{
if (statement == null)
{
throw new ArgumentNullException(nameof(statement));
}
SyntaxNode parent = statement.Parent;
switch (parent?.Kind())
{
case SyntaxKind.Block:
{
container = new BlockStatementContainer((BlockSyntax)parent);
return(true);
}
case SyntaxKind.SwitchSection:
{
container = new SwitchSectionStatementContainer((SwitchSectionSyntax)parent);
return(true);
}
default:
{
container = null;
return(false);
}
}
}
public static Task <Document> RefactorAsync(
Document document,
ObjectCreationExpressionSyntax objectCreation,
SelectedStatementCollection selectedStatements,
CancellationToken cancellationToken = default(CancellationToken))
{
IStatementContainer container = selectedStatements.Container;
ExpressionStatementSyntax[] expressionStatements = selectedStatements
.Skip(1)
.Cast <ExpressionStatementSyntax>()
.ToArray();
StatementSyntax firstNode = selectedStatements.First;
SyntaxList <StatementSyntax> newStatements = container.Statements.Replace(
firstNode,
firstNode.ReplaceNode(
objectCreation,
objectCreation.WithInitializer(CreateInitializer(objectCreation, expressionStatements))));
int count = expressionStatements.Length;
int index = selectedStatements.FirstIndex + 1;
while (count > 0)
{
newStatements = newStatements.RemoveAt(index);
count--;
}
return(document.ReplaceNodeAsync(
container.Node,
container.NodeWithStatements(newStatements),
cancellationToken));
}
public static Task <Document> RefactorAsync(
Document document,
IStatementContainer container,
ImmutableArray <IfStatementSyntax> ifStatements,
CancellationToken cancellationToken = default(CancellationToken))
{
IfStatementSyntax newIfStatement = IfStatement(
CreateCondition(ifStatements),
Block(CreateStatements(ifStatements)));
SyntaxList <StatementSyntax> statements = container.Statements;
int index = statements.IndexOf(ifStatements[0]);
SyntaxList <StatementSyntax> newStatements = statements.Replace(
ifStatements[0],
newIfStatement
.WithLeadingTrivia(ifStatements[0].GetLeadingTrivia())
.WithTrailingTrivia(ifStatements[ifStatements.Length - 1].GetTrailingTrivia()));
for (int i = 1; i < ifStatements.Length; i++)
{
newStatements = newStatements.RemoveAt(index + 1);
}
return(document.ReplaceNodeAsync(container.Node, container.NodeWithStatements(newStatements), cancellationToken));
}
internal static void ComputeRefactoring(RefactoringContext context, BinaryExpressionSpan binaryExpressionSpan)
{
BinaryExpressionSyntax binaryExpression = binaryExpressionSpan.BinaryExpression;
SyntaxKind kind = binaryExpression.Kind();
if (kind == SyntaxKind.LogicalAndExpression ||
kind == SyntaxKind.LogicalOrExpression)
{
BinaryExpressionSyntax condition = GetCondition(binaryExpression);
if (condition != null)
{
SyntaxNode parent = condition.Parent;
switch (parent?.Kind())
{
case SyntaxKind.IfStatement:
{
if (kind == SyntaxKind.LogicalAndExpression)
{
var refactoring = new ExtractConditionFromIfToNestedIfRefactoring();
context.RegisterRefactoring(
refactoring.Title,
cancellationToken => refactoring.RefactorAsync(context.Document, (IfStatementSyntax)parent, condition, binaryExpressionSpan, cancellationToken));
}
else if (kind == SyntaxKind.LogicalOrExpression)
{
IStatementContainer container = GetStatementContainer((StatementSyntax)parent);
if (container != null)
{
var refactoring = new ExtractConditionFromIfToIfRefactoring();
context.RegisterRefactoring(
refactoring.Title,
cancellationToken => refactoring.RefactorAsync(context.Document, container, condition, binaryExpressionSpan, cancellationToken));
}
}
break;
}
case SyntaxKind.WhileStatement:
{
if (kind == SyntaxKind.LogicalAndExpression)
{
var refactoring = new ExtractConditionFromWhileToNestedIfRefactoring();
context.RegisterRefactoring(
refactoring.Title,
cancellationToken => refactoring.RefactorAsync(context.Document, (WhileStatementSyntax)parent, condition, binaryExpressionSpan, cancellationToken));
}
break;
}
}
}
}
}
public static Task <Document> RefactorAsync(
Document document,
VariableDeclaratorSyntax declarator,
CancellationToken cancellationToken)
{
var declaration = (VariableDeclarationSyntax)declarator.Parent;
var localDeclaration = (LocalDeclarationStatementSyntax)declaration.Parent;
IStatementContainer container = StatementContainer.Create(localDeclaration);
SyntaxList <StatementSyntax> statements = container.Statements;
int index = statements.IndexOf(localDeclaration);
StatementSyntax nextStatement = statements[index + 1];
var expressionStatement = (ExpressionStatementSyntax)nextStatement;
var assignment = (AssignmentExpressionSyntax)expressionStatement.Expression;
ExpressionSyntax right = assignment.Right;
EqualsValueClauseSyntax initializer = declarator.Initializer;
ExpressionSyntax value = initializer?.Value;
VariableDeclaratorSyntax newDeclarator = (value != null)
? declarator.ReplaceNode(value, right)
: declarator.WithInitializer(EqualsValueClause(right));
LocalDeclarationStatementSyntax newLocalDeclaration = localDeclaration.ReplaceNode(declarator, newDeclarator);
SyntaxTriviaList trailingTrivia = nextStatement.GetTrailingTrivia();
IEnumerable <SyntaxTrivia> trivia = container
.Node
.DescendantTrivia(TextSpan.FromBounds(localDeclaration.Span.End, right.SpanStart));
if (!trivia.All(f => f.IsWhitespaceOrEndOfLineTrivia()))
{
newLocalDeclaration = newLocalDeclaration.WithTrailingTrivia(trivia.Concat(trailingTrivia));
}
else
{
newLocalDeclaration = newLocalDeclaration.WithTrailingTrivia(trailingTrivia);
}
SyntaxList <StatementSyntax> newStatements = statements
.Replace(localDeclaration, newLocalDeclaration)
.RemoveAt(index + 1);
return(document.ReplaceNodeAsync(container.Node, container.NodeWithStatements(newStatements), cancellationToken));
}
/// <summary>
/// visits a control token
/// </summary>
/// <param name="controltoken">control token to visit</param>
public virtual void VisitControlToken(IStatementContainer controltoken)
{
if (controltoken is IParameterContainer parametercontrol)
{
VisitParameterContainer(parametercontrol);
}
VisitToken(controltoken.Body);
if (controltoken is Try @try)
{
VisitToken(@try.Catch);
}
if (controltoken is If @if && @if.Else != null)
{
VisitToken(@if.Else);
}
}
public Task <Document> RefactorAsync(
Document document,
IStatementContainer container,
BinaryExpressionSyntax condition,
ExpressionSyntax expression,
CancellationToken cancellationToken = default(CancellationToken))
{
var ifStatement = (IfStatementSyntax)condition.Parent;
IfStatementSyntax newIfStatement = RemoveExpressionFromCondition(ifStatement, condition, expression)
.WithFormatterAnnotation();
SyntaxNode newNode = AddNextIf(container, ifStatement, newIfStatement, expression);
return(document.ReplaceNodeAsync(container.Node, newNode, cancellationToken));
}
private static Task <Document> RefactorAsync(
Document document,
StatementSyntax statement,
IfStatementSyntax ifStatement,
int statementIndex,
IStatementContainer container,
ExpressionSyntax expression,
CancellationToken cancellationToken)
{
var expressionStatement = (ExpressionStatementSyntax)ifStatement.GetSingleStatementOrDefault();
var assignment = (AssignmentExpressionSyntax)expressionStatement.Expression;
ExpressionSyntax left = expression
.WithoutTrailingTrivia()
.Parenthesize(moveTrivia: true)
.WithSimplifierAnnotation();
ExpressionSyntax right = assignment.Right
.WithTrailingTrivia(expression.GetTrailingTrivia())
.Parenthesize(moveTrivia: true)
.WithSimplifierAnnotation();
BinaryExpressionSyntax newNode = CSharpFactory.CoalesceExpression(left, right);
StatementSyntax newStatement = statement.ReplaceNode(expression, newNode);
IEnumerable <SyntaxTrivia> trivia = container.Node.DescendantTrivia(TextSpan.FromBounds(statement.Span.End, ifStatement.Span.End));
if (!trivia.All(f => f.IsWhitespaceOrEndOfLineTrivia()))
{
newStatement = newStatement.WithTrailingTrivia(trivia);
newStatement = newStatement.AppendToTrailingTrivia(ifStatement.GetTrailingTrivia());
}
else
{
newStatement = newStatement.WithTrailingTrivia(ifStatement.GetTrailingTrivia());
}
SyntaxList <StatementSyntax> newStatements = container.Statements
.Remove(ifStatement)
.ReplaceAt(statementIndex, newStatement);
return(document.ReplaceNodeAsync(container.Node, container.NodeWithStatements(newStatements), cancellationToken));
}
private void ReplaceOriginalMultipleVariableDeclarationStatement(MultipleVariableDeclarationStatement decl, IList stmts)
{
int index;
// Replace the VariableDeclarationStatement node by a
// (possible) sequence of SingleVariableDeclarationStatement
IStatementContainer stmtContainer = decl.Parent as IStatementContainer;
index = stmtContainer.Statements.IndexOf(decl);
stmtContainer.Statements.RemoveAt(index);
foreach (SingleVariableDeclarationStatement svDecl in stmts)
{
stmtContainer.Statements.Insert(index++, svDecl);
}
}
public override Task <Document> RefactorAsync(
Document document,
CancellationToken cancellationToken = default(CancellationToken))
{
IStatementContainer container = StatementContainer.Create(IfStatement);
SyntaxList <StatementSyntax> statements = container.Statements;
int index = statements.IndexOf(IfStatement);
TStatement newStatement = CreateNewStatement();
SyntaxList <StatementSyntax> newStatements = statements
.RemoveAt(index)
.ReplaceAt(index - 1, newStatement);
return(document.ReplaceNodeAsync(container.Node, container.NodeWithStatements(newStatements), cancellationToken));
}
private static Task <Document> RefactorAsync(
Document document,
IStatementContainer statementContainer,
StatementSyntax statement,
InitializerExpressionSyntax initializer,
ExpressionSyntax expression,
CancellationToken cancellationToken)
{
ExpressionStatementSyntax[] expressions = Refactor(initializer, expression).ToArray();
expressions[expressions.Length - 1] = expressions[expressions.Length - 1]
.WithTrailingTrivia(statement.GetTrailingTrivia());
SyntaxList <StatementSyntax> statements = statementContainer.Statements;
int index = statements.IndexOf(statement);
StatementSyntax newStatement = statement.RemoveNode(initializer, SyntaxRemoveOptions.KeepNoTrivia);
SyntaxKind statementKind = statement.Kind();
if (statementKind == SyntaxKind.ExpressionStatement)
{
var expressionStatement = (ExpressionStatementSyntax)newStatement;
newStatement = expressionStatement
.WithExpression(expressionStatement.Expression.WithoutTrailingTrivia());
}
else if (statementKind == SyntaxKind.LocalDeclarationStatement)
{
var localDeclaration = (LocalDeclarationStatementSyntax)newStatement;
newStatement = localDeclaration
.WithDeclaration(localDeclaration.Declaration.WithoutTrailingTrivia());
}
SyntaxList <StatementSyntax> newStatements = statements.Replace(statement, newStatement);
SyntaxNode newNode = statementContainer
.NodeWithStatements(newStatements.InsertRange(index + 1, expressions))
.WithFormatterAnnotation();
return(document.ReplaceNodeAsync(statementContainer.Node, newNode, cancellationToken));
}
public override bool VisitAssignmentExpression(AssignmentExpression assignExp)
{
if (assignExp.Target.NodeType == NodeType.VariableRefExpression)
{
// Convert to declaration if not found on the scope
VariableReferenceExpression varRef = (VariableReferenceExpression)assignExp.Target;
ISymbolTable scope = varRef.SymbolTable;
System.Diagnostics.Debug.Assert(scope != null);
String name = varRef.Identifier.Name;
if (!scope.IsDefined(name)) // TODO: The rules are slighly more complicated than that.
{
errorReport.Disable();
SingleVariableDeclarationStatement varDecl = new SingleVariableDeclarationStatement(varRef.Identifier);
IStatement stmt = ASTUtils.GetParentStatement(varRef);
System.Diagnostics.Debug.Assert(stmt != null);
IStatementContainer stmts = stmt.Parent as IStatementContainer;
int index = stmts.Statements.IndexOf(stmt);
varDecl.InitExp = assignExp.Value;
// stmts.Statements.Insert(index, varDecl);
stmts.Statements.Replace(stmt, varDecl);
if (!ApplyDeclarationRules(varRef.Identifier, scope, varDecl, stmt))
{
stmts.Statements.Remove(varDecl);
}
errorReport.Enable();
}
}
return(base.VisitAssignmentExpression(assignExp));
}
private static SyntaxNode AddNextIf(
IStatementContainer container,
IfStatementSyntax ifStatement,
IfStatementSyntax newIfStatement,
ExpressionSyntax expression)
{
IfStatementSyntax nextIfStatement = ifStatement.WithCondition(expression)
.WithFormatterAnnotation();
SyntaxList <StatementSyntax> statements = container.Statements;
int index = statements.IndexOf(ifStatement);
SyntaxList <StatementSyntax> newStatements = statements
.Replace(ifStatement, newIfStatement)
.Insert(index + 1, nextIfStatement);
return(container.NodeWithStatements(newStatements));
}
public override Task <Document> RefactorAsync(Document document, CancellationToken cancellationToken = default(CancellationToken))
{
IStatementContainer container = StatementContainer.Create(IfStatement);
SyntaxList <StatementSyntax> statements = container.Statements;
int index = statements.IndexOf(IfStatement);
ConditionalExpressionSyntax conditionalExpression = IfRefactoringHelper.CreateConditionalExpression(IfStatement.Condition, Expression1, Expression2);
StatementSyntax newStatement = CreateStatement(conditionalExpression)
.WithLeadingTrivia(IfStatement.GetLeadingTrivia())
.WithTrailingTrivia(statements[index + 1].GetTrailingTrivia())
.WithFormatterAnnotation();
SyntaxList <StatementSyntax> newStatements = statements
.RemoveAt(index)
.ReplaceAt(index, newStatement);
return(document.ReplaceNodeAsync(container.Node, container.NodeWithStatements(newStatements), cancellationToken));
}
public Task <Document> RefactorAsync(
Document document,
SelectedStatementCollection selectedStatements,
CancellationToken cancellationToken = default(CancellationToken))
{
IStatementContainer container = selectedStatements.Container;
StatementSyntax[] statements = selectedStatements.ToArray();
int index = selectedStatements.FirstIndex;
SyntaxTriviaList leadingTrivia = statements[0].GetLeadingTrivia();
SyntaxTriviaList trailingTrivia = statements[statements.Length - 1].GetTrailingTrivia();
statements[0] = statements[0].WithLeadingTrivia();
statements[statements.Length - 1] = statements[statements.Length - 1].WithTrailingTrivia();
SyntaxList <StatementSyntax> newStatements = container.Statements;
int cnt = statements.Length;
while (cnt > 0)
{
newStatements = newStatements.RemoveAt(index);
cnt--;
}
TStatement statement = CreateStatement(statements.ToImmutableArray());
statement = statement
.WithLeadingTrivia(leadingTrivia)
.WithTrailingTrivia(trailingTrivia)
.WithFormatterAnnotation();
newStatements = newStatements.Insert(index, statement);
return(document.ReplaceNodeAsync(container.Node, container.NodeWithStatements(newStatements), cancellationToken));
}
private static Task <Document> RefactorAsync(
Document document,
IStatementContainer container,
LocalDeclarationStatementSyntax[] localDeclarations,
CancellationToken cancellationToken = default(CancellationToken))
{
LocalDeclarationStatementSyntax localDeclaration = localDeclarations[0];
SyntaxList <StatementSyntax> statements = container.Statements;
int index = statements.IndexOf(localDeclaration);
VariableDeclaratorSyntax[] variables = localDeclarations
.Skip(1)
.Select(f => f.Declaration)
.SelectMany(f => f.Variables)
.ToArray();
LocalDeclarationStatementSyntax newLocalDeclaration = localDeclaration
.AddDeclarationVariables(variables)
.WithTrailingTrivia(localDeclarations[localDeclarations.Length - 1].GetTrailingTrivia())
.WithFormatterAnnotation();
SyntaxList <StatementSyntax> newStatements = statements.Replace(
localDeclaration,
newLocalDeclaration);
for (int i = 1; i < localDeclarations.Length; i++)
{
newStatements = newStatements.RemoveAt(index + 1);
}
return(document.ReplaceNodeAsync(
container.Node,
container.NodeWithStatements(newStatements),
cancellationToken));
}
private static Task<Document> RefactorAsync(
Document document,
ExpressionSyntax expression,
SyntaxList<StatementSyntax> statements,
IStatementContainer container,
int statementIndex,
int lastStatementIndex,
CancellationToken cancellationToken)
{
IEnumerable<StatementSyntax> blockStatements = statements
.Skip(statementIndex + 1)
.Take(lastStatementIndex - statementIndex);
IfStatementSyntax ifStatement = CreateNullCheck(expression, List(blockStatements));
if (lastStatementIndex < statements.Count - 1)
ifStatement = ifStatement.AppendToTrailingTrivia(NewLineTrivia());
IEnumerable<StatementSyntax> newStatements = statements.Take(statementIndex + 1)
.Concat(new IfStatementSyntax[] { ifStatement })
.Concat(statements.Skip(lastStatementIndex + 1));
return document.ReplaceNodeAsync(container.Node, container.NodeWithStatements(newStatements), cancellationToken);
}
private bool ApplyDeclarationRules(Identifier ident, ISymbolTable namescope, SingleVariableDeclarationStatement typeDecl, IStatement statem)
{
// Second simple case: a local var and we are on the right place to
// declare it
if (ident.Type == IdentifierType.Local &&
(namescope.ScopeType == ScopeType.Method ||
namescope.ScopeType == ScopeType.Compound ||
namescope.ScopeType == ScopeType.Block))
{
namescope.AddVariable(ident);
return(true);
}
// More complex: a block or compound tries to redefine a variable
if (ident.Type == IdentifierType.Local &&
(namescope.ScopeType == ScopeType.Compound ||
namescope.ScopeType == ScopeType.Block))
{
if (namescope.Parent.IsDefined(ident.Name))
{
errorReport.Error("TODOFILENAME", typeDecl.Position, "Sorry but '{0}' is already defined in a parent scope.", ident.Name);
return(false);
}
}
// Local variables at class level?
// We will support that as a type initializer, but not now.
if (ident.Type == IdentifierType.Local && namescope.ScopeType == ScopeType.Type)
{
errorReport.Error("TODOFILENAME", typeDecl.Position, "At type level, just instance or static fields are allowed (yet)");
return(false);
}
// Static or instance in a method/block/compound are moved
// to the parent class or source unit level
if (ident.Type == IdentifierType.InstanceField ||
ident.Type == IdentifierType.StaticField)
{
if (namescope.ScopeType == ScopeType.SourceUnit ||
namescope.ScopeType == ScopeType.Type)
{
namescope.AddVariable(ident);
}
else if (namescope.ScopeType == ScopeType.Method ||
namescope.ScopeType == ScopeType.Compound ||
namescope.ScopeType == ScopeType.Block)
{
IASTNode node = statem.Parent;
while (node != null &&
node.NodeType != NodeType.TypeDefinition &&
node.NodeType != NodeType.SourceUnit)
{
node = node.Parent;
}
if (node == null || node.SymbolTable == null)
{
errorReport.Error("TODOFILENAME", typeDecl.Position,
"Compiler error: The instance of static declaration '{0}' could not be mapped to a parent type", ident.Name);
return(false);
}
ISymbolTable parentScope = node.SymbolTable;
IStatementContainer typeStmtsContainer = node as IStatementContainer;
System.Diagnostics.Debug.Assert(parentScope != null);
System.Diagnostics.Debug.Assert(typeStmtsContainer != null);
if (parentScope.IsDefined(ident.Name))
{
errorReport.Error("TODOFILENAME", typeDecl.Position,
"Sorry but '{0}' is already defined.", ident.Name);
return(false);
}
else
{
parentScope.AddVariable(ident);
// We can replace the declaration on the method
// body with an assignment if and only if this type decl has
// an init expression, so CreateAssignmentFromTypeDecl can return null
AssignmentExpression assignExp = CreateAssignmentFromTypeDecl(typeDecl);
ExpressionStatement assignExpStmt = new ExpressionStatement(assignExp);
typeDecl.ConvertInitExpressionToDependency();
// Replace the declaration with an assignment
(statem.Parent as IStatementContainer).Statements.Replace(typeDecl, assignExpStmt);
// Add the member/field declaration to the parent
typeStmtsContainer.Statements.Add(typeDecl);
// TODO: Link assignment expression and typeDecl to help
// find out the type of the field later
return(true);
}
}
}
return(false);
}
internal TypeStatement(string name, IStatementContainer parent)
{
Name = name;
Parent = parent;
}
private SelectedStatementCollection(IStatementContainer container, TextSpan span)
: base(container.Statements, span)
{
Container = container;
}
/// <inheritdoc />
public override void VisitControlToken(IStatementContainer controltoken)
{
base.VisitControlToken(controltoken);
++ControlTokens;
}