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//
// ParameterUtil.cs
//
// Author:
// Mike Krüger <mkrueger@xamarin.com>
//
// Copyright (c) 2014 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;
using System.Collections.Generic;
using Microsoft.CodeAnalysis;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using MonoDevelop.Core.Text;
namespace ICSharpCode.NRefactory6.CSharp
{
public class ParameterIndexResult
{
public readonly static ParameterIndexResult Invalid = new ParameterIndexResult (null, -1);
public readonly static ParameterIndexResult First = new ParameterIndexResult (null, 0);
public readonly string[] UsedNamespaceParameters;
public readonly int ParameterIndex;
internal ParameterIndexResult(string[] usedNamespaceParameters, int parameterIndex)
{
UsedNamespaceParameters = usedNamespaceParameters;
ParameterIndex = parameterIndex;
}
}
public static class ParameterUtil
{
public static async Task<ParameterIndexResult> GetCurrentParameterIndex (Document document, int startOffset, int caretOffset, CancellationToken cancellationToken = default(CancellationToken))
{
var usedNamedParameters =new List<string> ();
var parameter = new Stack<int> ();
var bracketStack = new Stack<Stack<int>> ();
bool inSingleComment = false, inString = false, inVerbatimString = false, inChar = false, inMultiLineComment = false;
var word = new StringBuilder ();
bool foundCharAfterOpenBracket = false;
var text = await document.GetTextAsync(cancellationToken);
for (int i = startOffset; i < caretOffset; i++) {
char ch = text[i];
char nextCh = i + 1 < text.Length ? text[i + 1] : '\0';
if (ch == ':') {
usedNamedParameters.Add (word.ToString ());
word.Length = 0;
} else if (char.IsLetterOrDigit (ch) || ch =='_') {
word.Append (ch);
} else if (char.IsWhiteSpace (ch)) {
} else {
word.Length = 0;
}
if (!char.IsWhiteSpace(ch) && parameter.Count > 0)
foundCharAfterOpenBracket = true;
switch (ch) {
case '{':
if (inString || inChar || inVerbatimString || inSingleComment || inMultiLineComment) {
break;
}
bracketStack.Push (parameter);
parameter = new Stack<int> ();
break;
case '[':
case '(':
if (inString || inChar || inVerbatimString || inSingleComment || inMultiLineComment) {
break;
}
parameter.Push (0);
break;
case '}':
if (inString || inChar || inVerbatimString || inSingleComment || inMultiLineComment) {
break;
}
if (bracketStack.Count > 0) {
parameter = bracketStack.Pop ();
} else {
return ParameterIndexResult.Invalid;
}
break;
case ']':
case ')':
if (inString || inChar || inVerbatimString || inSingleComment || inMultiLineComment) {
break;
}
if (parameter.Count > 0) {
parameter.Pop ();
} else {
return ParameterIndexResult.Invalid;
}
break;
case '<':
if (inString || inChar || inVerbatimString || inSingleComment || inMultiLineComment) {
break;
}
parameter.Push (0);
break;
case '=':
if (nextCh == '>') {
i++;
continue;
}
break;
case '>':
if (inString || inChar || inVerbatimString || inSingleComment || inMultiLineComment) {
break;
}
if (parameter.Count > 0) {
parameter.Pop ();
}
break;
case ',':
if (inString || inChar || inVerbatimString || inSingleComment || inMultiLineComment) {
break;
}
if (parameter.Count > 0) {
parameter.Push (parameter.Pop () + 1);
}
break;
case '/':
if (inString || inChar || inVerbatimString) {
break;
}
if (nextCh == '/') {
i++;
inSingleComment = true;
}
if (nextCh == '*') {
inMultiLineComment = true;
}
break;
case '*':
if (inString || inChar || inVerbatimString || inSingleComment) {
break;
}
if (nextCh == '/') {
i++;
inMultiLineComment = false;
}
break;
case '@':
if (inString || inChar || inVerbatimString || inSingleComment || inMultiLineComment) {
break;
}
if (nextCh == '"') {
i++;
inVerbatimString = true;
}
break;
case '\\':
if (inString || inChar) {
i++;
}
break;
case '"':
if (inSingleComment || inMultiLineComment || inChar) {
break;
}
if (inVerbatimString) {
if (nextCh == '"') {
i++;
break;
}
inVerbatimString = false;
break;
}
inString = !inString;
break;
case '\'':
if (inSingleComment || inMultiLineComment || inString || inVerbatimString) {
break;
}
inChar = !inChar;
break;
default:
if (NewLine.IsNewLine(ch)) {
inSingleComment = false;
inString = false;
inChar = false;
}
break;
}
}
if (parameter.Count != 1 || bracketStack.Count > 0) {
return ParameterIndexResult.Invalid;
}
if (!foundCharAfterOpenBracket)
return ParameterIndexResult.First;
return new ParameterIndexResult (usedNamedParameters.ToArray(), parameter.Pop() + 1);
}
}
}
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