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//
// DiffParser.cs
//
// Author:
// Levi Bard <taktaktaktaktaktaktaktaktaktak@gmail.com>
//
// Copyright (c) 2010 Levi Bard
//
// 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.IO;
using System.Text.RegularExpressions;
using MonoDevelop.Ide.TypeSystem;
using ICSharpCode.NRefactory.TypeSystem;
using ICSharpCode.NRefactory.TypeSystem.Implementation;
using MonoDevelop.Projects;
using MonoDevelop.Core.Text;
namespace MonoDevelop.VersionControl.Views
{
/// <summary>
/// Parser for unified diffs
/// </summary>
public class DiffParser : TypeSystemParser
{
// Match the original file and time/revstamp line, capturing the filepath and the stamp
static Regex fileHeaderExpression = new Regex (@"^---\s+(?<filepath>[^\t]+)\t(?<stamp>.*)$", RegexOptions.Compiled);
// Match a chunk header line
static Regex chunkExpression = new Regex (@"^@@\s+(?<chunk>-\d+,\d+\s+\+\d+,\d+)\s+@@", RegexOptions.Compiled);
// Capture the file's EOL string
static Regex eolExpression = new Regex (@"(?<eol>\r\n|\n|\r)", RegexOptions.Compiled);
#region AbstractParser overrides
public override System.Threading.Tasks.Task<ParsedDocument> Parse (ParseOptions parseOptions, System.Threading.CancellationToken cancellationToken)
{
ParsedDocument doc = new DefaultParsedDocument (parseOptions.FileName);
DefaultUnresolvedTypeDefinition currentFile = null;
DefaultUnresolvedProperty currentRegion = null;
string eol = Environment.NewLine;
string content = parseOptions.Content.Text;
Match eolMatch = eolExpression.Match (content);
if (eolMatch != null && eolMatch.Success)
eol = eolMatch.Groups ["eol"].Value;
string[] lines = content.Split (new string[]{eol}, StringSplitOptions.None);
int linenum = 1;
Match lineMatch;
foreach (string line in lines) {
lineMatch = fileHeaderExpression.Match (line.Trim ());
if (lineMatch != null && lineMatch.Success) {
if (currentFile != null) // Close out previous file region
currentFile.BodyRegion = new DomRegion (currentFile.BodyRegion.BeginLine,
currentFile.BodyRegion.BeginColumn,
linenum - 1, int.MaxValue);
if (currentRegion != null) // Close out previous chunk region
currentRegion.BodyRegion = new DomRegion (currentRegion.BodyRegion.BeginLine,
currentRegion.BodyRegion.BeginColumn,
linenum - 1, int.MaxValue);
// Create new file region
currentFile = new DefaultUnresolvedTypeDefinition (string.Empty, string.Empty);
currentFile.Region = currentFile.BodyRegion = new DomRegion (lastToken (lineMatch.Groups ["filepath"].Value), linenum, line.Length + 1, linenum, int.MaxValue);
// doc.TopLevelTypeDefinitions.Add (currentFile);
} else {
lineMatch = chunkExpression.Match (line);
if (lineMatch != null && lineMatch.Success && currentFile != null) {
if (currentRegion != null) // Close out previous chunk region
currentRegion.BodyRegion = new DomRegion (currentRegion.BodyRegion.BeginLine,
currentRegion.BodyRegion.BeginColumn,
linenum - 1, int.MaxValue);
// Create new chunk region
currentRegion = new DefaultUnresolvedProperty (currentFile, lineMatch.Groups ["chunk"].Value);
currentRegion.Region = currentRegion.BodyRegion = new DomRegion (currentFile.Region.FileName, linenum, line.Length + 1, linenum, int.MaxValue);
currentFile.Members.Add (currentRegion);
}
}
++linenum;
}
// Close out trailing regions
if (currentFile != null)
currentFile.BodyRegion = new DomRegion (currentFile.BodyRegion.BeginLine,
currentFile.BodyRegion.BeginColumn,
Math.Max (1, linenum - 2), int.MaxValue);
if (currentRegion != null)
currentRegion.BodyRegion = new DomRegion (currentRegion.BodyRegion.BeginLine,
currentRegion.BodyRegion.BeginColumn,
Math.Max (1, linenum - 2), int.MaxValue);
return System.Threading.Tasks.Task.FromResult (doc);
}
#endregion
// Return the last token from a filepath
// (delimiter may not match Path.DirectorySeparatorChar)
static string lastToken (string filepath)
{
if (!string.IsNullOrEmpty (filepath)) {
string[] tokens = filepath.Split (new char[]{'\\','/'}, StringSplitOptions.RemoveEmptyEntries);
return tokens[tokens.Length-1];
}
return string.Empty;
}
}
}
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