text: ﻿//
  // GeneratedCodeRecognitionService.cs
  //
  // Author:
  //       Mike Krüger <mkrueger@xamarin.com>
  //
  // Copyright (c) 2015 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 System.IO;
  using System.Linq;
  using Microsoft.CodeAnalysis;
  using Microsoft.CodeAnalysis.Shared.Extensions;
  using Microsoft.CodeAnalysis.CSharp.Extensions;
  using Roslyn.Utilities;
  
  namespace ICSharpCode.NRefactory6.CSharp
  {
  	static class GeneratedCodeRecognitionService
  	{
  		public static bool IsFileNameForGeneratedCode(string fileName)
  		{
  			if (fileName.StartsWith("TemporaryGeneratedFile_", StringComparison.OrdinalIgnoreCase))
  			{
  				return true;
  			}
  
  			string extension = Path.GetExtension(fileName);
  			if (extension != string.Empty)
  			{
  				fileName = Path.GetFileNameWithoutExtension(fileName);
  
  				if (fileName.EndsWith("AssemblyInfo", StringComparison.OrdinalIgnoreCase) ||
  					fileName.EndsWith(".designer", StringComparison.OrdinalIgnoreCase) ||
  					fileName.EndsWith(".generated", StringComparison.OrdinalIgnoreCase) ||
  					fileName.EndsWith(".g", StringComparison.OrdinalIgnoreCase) ||
  					fileName.EndsWith(".g.i", StringComparison.OrdinalIgnoreCase) ||
  					fileName.EndsWith(".AssemblyAttributes", StringComparison.OrdinalIgnoreCase))
  				{
  					return true;
  				}
  			}
  
  			return false;
  		}
  
  		private static IEnumerable<Location> GetPreferredSourceLocations(ISymbol symbol)
  		{
  			var locations = symbol.Locations;
  
  			// First return visible source locations if we have them.  Else, go to the non-visible 
  			// source locations.  
  			var visibleSourceLocations = locations.Where(LocationExtensions.IsVisibleSourceLocation);
  			return visibleSourceLocations.Any()
  				? visibleSourceLocations
  					: locations.Where(loc => loc.IsInSource);
  		}
  
  		public static IEnumerable<Location> GetPreferredSourceLocations(Solution solution, ISymbol symbol)
  		{
  			// Prefer non-generated source locations over generated ones.
  
  			var sourceLocations = GetPreferredSourceLocations(symbol);
  
  			var candidateLocationGroups = from c in sourceLocations
  				let doc = solution.GetDocument(c.SourceTree)
  					where doc != null
  				group c by IsFileNameForGeneratedCode(doc.FilePath);
  
  			var generatedSourceLocations = candidateLocationGroups.SingleOrDefault(g => g.Key) ?? SpecializedCollections.EmptyEnumerable<Location>();
  			var nonGeneratedSourceLocations = candidateLocationGroups.SingleOrDefault(g => !g.Key) ?? SpecializedCollections.EmptyEnumerable<Location>();
  
  			return nonGeneratedSourceLocations.Any() ? nonGeneratedSourceLocations : generatedSourceLocations;
  		}
  	}
  }
  
  