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//
// DeclareLocalVariableAction.cs
//
// Author:
// Mike Krüger <mkrueger@xamarin.com>
//
// Copyright (c) 2012 Xamarin Inc. (http://xamarin.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System.Threading;
using System.Collections.Generic;
using System.Linq;
using ICSharpCode.NRefactory.Semantics;
using ICSharpCode.NRefactory.CSharp.Resolver;
using ICSharpCode.NRefactory.TypeSystem;
using ICSharpCode.NRefactory.PatternMatching;
namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
[ContextAction("Declare local variable", Description = "Declare a local variable out of a selected expression.")]
public class DeclareLocalVariableAction : ICodeActionProvider
{
public IEnumerable<CodeAction> GetActions(RefactoringContext context)
{
if (!context.IsSomethingSelected) {
yield break;
}
var selected = new List<AstNode>(context.GetSelectedNodes());
if (selected.Count != 1 || !(selected [0] is Expression)) {
yield break;
}
var expr = selected [0] as Expression;
if (expr is ArrayInitializerExpression) {
var arr = (ArrayInitializerExpression)expr;
if (arr.IsSingleElement) {
expr = arr.Elements.First();
} else {
yield break;
}
}
var visitor = new SearchNodeVisitior(expr);
var node = context.GetNode <BlockStatement>();
if (node != null) {
node.AcceptVisitor(visitor);
}
yield return new CodeAction(context.TranslateString("Declare local variable"), script => {
var resolveResult = context.Resolve(expr);
var guessedType = resolveResult.Type;
if (resolveResult is MethodGroupResolveResult) {
guessedType = GetDelegateType(context, ((MethodGroupResolveResult)resolveResult).Methods.First(), expr);
}
var name = CreateMethodDeclarationAction.CreateBaseName(expr, guessedType);
var type = context.UseExplicitTypes ? context.CreateShortType(guessedType) : new SimpleType("var");
var varDecl = new VariableDeclarationStatement(type, name, expr.Clone());
var replaceNode = visitor.Matches.First () as Expression;
if (replaceNode.Parent is ExpressionStatement) {
script.Replace(replaceNode.Parent, varDecl);
script.Select(varDecl.Variables.First().NameToken);
} else {
var containing = replaceNode.Parent;
while (!(containing.Parent is BlockStatement)) {
containing = containing.Parent;
}
script.InsertBefore(containing, varDecl);
var identifierExpression = new IdentifierExpression(name);
script.Replace(replaceNode, identifierExpression);
script.Link(varDecl.Variables.First().NameToken, identifierExpression);
}
}, expr);
if (visitor.Matches.Count > 1) {
yield return new CodeAction(string.Format(context.TranslateString("Declare local variable (replace '{0}' occurrences)"), visitor.Matches.Count), script => {
var resolveResult = context.Resolve(expr);
var guessedType = resolveResult.Type;
if (resolveResult is MethodGroupResolveResult) {
guessedType = GetDelegateType(context, ((MethodGroupResolveResult)resolveResult).Methods.First(), expr);
}
var linkedNodes = new List<AstNode>();
var name = CreateMethodDeclarationAction.CreateBaseName(expr, guessedType);
var type = context.UseExplicitTypes ? context.CreateShortType(guessedType) : new SimpleType("var");
var varDecl = new VariableDeclarationStatement(type, name, expr.Clone());
linkedNodes.Add(varDecl.Variables.First().NameToken);
var first = visitor.Matches [0];
if (first.Parent is ExpressionStatement) {
script.Replace(first.Parent, varDecl);
} else {
var containing = first.Parent;
while (!(containing.Parent is BlockStatement)) {
containing = containing.Parent;
}
script.InsertBefore(containing, varDecl);
var identifierExpression = new IdentifierExpression(name);
linkedNodes.Add(identifierExpression);
script.Replace(first, identifierExpression);
}
for (int i = 1; i < visitor.Matches.Count; i++) {
var identifierExpression = new IdentifierExpression(name);
linkedNodes.Add(identifierExpression);
script.Replace(visitor.Matches [i], identifierExpression);
}
script.Link(linkedNodes.ToArray ());
}, expr);
}
}
// Gets Action/Func delegate types for a given method.
IType GetDelegateType(RefactoringContext context, IMethod method, Expression expr)
{
var parameters = new List<IType>();
var invoke = expr.Parent as InvocationExpression;
if (invoke == null) {
return null;
}
foreach (var arg in invoke.Arguments) {
parameters.Add(context.Resolve(arg).Type);
}
ITypeDefinition genericType;
if (method.ReturnType.FullName == "System.Void") {
genericType = context.Compilation.GetAllTypeDefinitions().FirstOrDefault(t => t.FullName == "System.Action" && t.TypeParameterCount == parameters.Count);
} else {
parameters.Add(method.ReturnType);
genericType = context.Compilation.GetAllTypeDefinitions().FirstOrDefault(t => t.FullName == "System.Func" && t.TypeParameterCount == parameters.Count);
}
if (genericType == null) {
return null;
}
return new ParameterizedType(genericType, parameters);
}
internal class SearchNodeVisitior : DepthFirstAstVisitor
{
readonly AstNode searchForNode;
public readonly List<AstNode> Matches = new List<AstNode> ();
public SearchNodeVisitior (AstNode searchForNode)
{
this.searchForNode = searchForNode;
AddNode (searchForNode);
}
void AddNode(AstNode node)
{
if (node.Parent is ParenthesizedExpression) {
Matches.Add(node.Parent);
} else {
Matches.Add(node);
}
}
protected override void VisitChildren(AstNode node)
{
if (node.StartLocation > searchForNode.StartLocation && node.IsMatch(searchForNode)) {
AddNode(node);
return;
}
base.VisitChildren (node);
}
}
}
}
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