public override 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 stringType = new PrimitiveType("string");
var formatInvocation = stringType.Invoke("Format");
var formatLiteral = new PrimitiveExpression("");
var counter = 0;
var arguments = new List<Expression>();
formatInvocation.Arguments.Add(formatLiteral);
var concatItems = GetConcatItems(context, expr);
bool hasVerbatimStrings = false;
bool hasNonVerbatimStrings = false;
foreach (var item in concatItems) {
if (IsStringLiteral(item)) {
var stringLiteral = (PrimitiveExpression)item;
if (stringLiteral.LiteralValue[0] == '@') {
hasVerbatimStrings = true;
} else {
hasNonVerbatimStrings = true;
}
}
}
var format = new StringBuilder();
var verbatim = hasVerbatimStrings && hasNonVerbatimStrings;
format.Append('"');
foreach (var item in concatItems) {
if (IsStringLiteral(item)) {
var stringLiteral = (PrimitiveExpression)item;
string rawLiteral;
if (hasVerbatimStrings && hasNonVerbatimStrings) {
rawLiteral = stringLiteral.Value.ToString().Replace("\"", "\"\"");
} else {
if (stringLiteral.LiteralValue[0] == '@') {
verbatim = true;
rawLiteral = stringLiteral.LiteralValue.Substring(2, stringLiteral.LiteralValue.Length - 3);
} else {
rawLiteral = stringLiteral.LiteralValue.Substring(1, stringLiteral.LiteralValue.Length - 2);
}
}
format.Append(QuoteBraces(rawLiteral));
} else {
Expression myItem = RemoveUnnecessaryToString(item);
string itemFormatStr = DetermineItemFormatString(ref myItem);
var index = IndexOf(arguments, myItem);
if (index == -1) {
// new item
formatInvocation.Arguments.Add(myItem.Clone());
arguments.Add(item);
format.Append("{" + counter++ + itemFormatStr + "}");
} else {
// existing item
format.Append("{" + index + itemFormatStr + "}");
}
}
}
format.Append('"');
if (verbatim)
format.Insert(0, '@');
formatLiteral.SetValue(format.ToString(), format.ToString());
if (arguments.Count > 0)
script.Replace(expr, formatInvocation);
else
script.Replace(expr, formatLiteral);
}, node);
}
public override 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 stringType = new PrimitiveType("string");
var formatInvocation = stringType.Invoke("Format");
var formatLiteral = new PrimitiveExpression("");
var counter = 0;
var arguments = new List <Expression>();
formatInvocation.Arguments.Add(formatLiteral);
var concatItems = GetConcatItems(context, expr);
bool hasVerbatimStrings = false;
bool hasNonVerbatimStrings = false;
foreach (var item in concatItems)
{
if (IsStringLiteral(item))
{
var stringLiteral = (PrimitiveExpression)item;
if (stringLiteral.LiteralValue[0] == '@')
{
hasVerbatimStrings = true;
}
else
{
hasNonVerbatimStrings = true;
}
}
}
var format = new StringBuilder();
var verbatim = hasVerbatimStrings && hasNonVerbatimStrings;
format.Append('"');
foreach (var item in concatItems)
{
if (IsStringLiteral(item))
{
var stringLiteral = (PrimitiveExpression)item;
string rawLiteral;
if (hasVerbatimStrings && hasNonVerbatimStrings)
{
rawLiteral = stringLiteral.Value.ToString().Replace("\"", "\"\"");
}
else
{
if (stringLiteral.LiteralValue[0] == '@')
{
verbatim = true;
rawLiteral = stringLiteral.LiteralValue.Substring(2, stringLiteral.LiteralValue.Length - 3);
}
else
{
rawLiteral = stringLiteral.LiteralValue.Substring(1, stringLiteral.LiteralValue.Length - 2);
}
}
format.Append(QuoteBraces(rawLiteral));
}
else
{
Expression myItem = RemoveUnnecessaryToString(item);
string itemFormatStr = DetermineItemFormatString(ref myItem);
var index = IndexOf(arguments, myItem);
if (index == -1)
{
// new item
formatInvocation.Arguments.Add(myItem.Clone());
arguments.Add(item);
format.Append("{" + counter++ + itemFormatStr + "}");
}
else
{
// existing item
format.Append("{" + index + itemFormatStr + "}");
}
}
}
format.Append('"');
if (verbatim)
{
format.Insert(0, '@');
}
formatLiteral.SetValue(format.ToString(), format.ToString());
if (arguments.Count > 0)
{
script.Replace(expr, formatInvocation);
}
else
{
script.Replace(expr, formatLiteral);
}
}, node));
}