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//
// UseStringFormatAction.cs
//
// Author:
// Mansheng Yang <lightyang0@gmail.com>
//
// Copyright (c) 2012 Mansheng Yang <lightyang0@gmail.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.Collections.Generic;
using System.Text;
using ICSharpCode.NRefactory.TypeSystem;
using ICSharpCode.NRefactory.PatternMatching;
namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
[ContextAction ("Use string.Format()",
Description = "Convert concatenation of strings and objects to string.Format()")]
public class UseStringFormatAction : ICodeActionProvider
{
public IEnumerable<CodeAction> GetActions (RefactoringContext context)
{
// NOTE: @, multiple occurance
var node = context.GetNode ();
while (node != null && !IsStringConcatenation(context, node as BinaryOperatorExpression))
node = node.Parent;
if (node == null)
yield break;
var expr = (BinaryOperatorExpression)node;
var parent = expr.Parent as BinaryOperatorExpression;
while (parent != null && parent.Operator == BinaryOperatorType.Add) {
expr = parent;
parent = expr.Parent as BinaryOperatorExpression;
}
yield return new CodeAction (context.TranslateString ("Use string.Format()"),
script =>
{
var format = new StringBuilder ();
var stringType = new PrimitiveType ("string");
var formatInvocation = new InvocationExpression (
new MemberReferenceExpression (new TypeReferenceExpression (stringType), "Format"));
var formatLiteral = new PrimitiveExpression ("");
var counter = 0;
var verbatim = false;
var arguments = new List<Expression> ();
format.Append ('"');
formatInvocation.Arguments.Add (formatLiteral);
foreach (var item in GetConcatItems (context, expr)) {
if (IsStringLiteral (item)) {
var stringLiteral = (PrimitiveExpression)item;
if (stringLiteral.LiteralValue [0] == '@') {
verbatim = true;
format.Append (stringLiteral.LiteralValue, 2, stringLiteral.LiteralValue.Length - 3);
} else {
format.Append (stringLiteral.LiteralValue, 1, stringLiteral.LiteralValue.Length - 2);
}
} else {
var index = IndexOf (arguments, item);
if (index == -1) {
// new item
formatInvocation.Arguments.Add (item.Clone ());
arguments.Add (item);
format.Append ("{" + counter++ + "}");
} else {
// existing item
format.Append ("{" + index + "}");
}
}
}
format.Append ('"');
if (verbatim)
format.Insert (0, '@');
formatLiteral.LiteralValue = format.ToString ();
script.Replace (expr, formatInvocation);
}, node);
}
static int IndexOf (IList<Expression> arguments, Expression item)
{
for (int i = 0; i < arguments.Count; i++) {
if (item.Match (arguments [i]).Success)
return i;
}
return -1;
}
static IEnumerable<Expression> GetConcatItems (RefactoringContext context, BinaryOperatorExpression expr)
{
var leftExpr = expr.Left as BinaryOperatorExpression;
if (IsStringConcatenation(context, leftExpr)) {
foreach (var item in GetConcatItems (context, leftExpr))
yield return item;
} else {
yield return expr.Left;
}
var rightExpr = expr.Right as BinaryOperatorExpression;
if (IsStringConcatenation(context, rightExpr)) {
foreach (var item in GetConcatItems (context, rightExpr))
yield return item;
} else {
yield return expr.Right;
}
}
static bool IsStringConcatenation (RefactoringContext context, BinaryOperatorExpression expr)
{
if (expr == null || expr.Operator != BinaryOperatorType.Add)
return false;
var typeDef = context.Resolve (expr).Type.GetDefinition();
return typeDef != null && typeDef.KnownTypeCode == KnownTypeCode.String;
}
static bool IsStringLiteral (AstNode node)
{
var expr = node as PrimitiveExpression;
return expr != null && expr.Value is string;
}
}
}
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