platform/vcs-impl/src/com/intellij/openapi/vcs/impl/UpToDateLineNumberProviderImpl.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package com.intellij.openapi.vcs.impl;
  17
  18 import com.intellij.openapi.editor.Document;
  19 import com.intellij.openapi.localVcs.UpToDateLineNumberProvider;
  20 import com.intellij.openapi.project.Project;
  21 import com.intellij.openapi.vcs.ex.LineStatusTracker;
  22 import com.intellij.openapi.vcs.ex.Range;
  23 import com.intellij.openapi.vfs.VirtualFile;
  24
  25 import java.util.List;
  26
  27 /**
  28  * author: lesya
  29  */
  30 public class UpToDateLineNumberProviderImpl implements UpToDateLineNumberProvider {
  31   private final Document myDocument;
  32   private final Project myProject;
  33   private final String myUpToDateContent;
  34   private final VirtualFile myVf;
  35
  36   public UpToDateLineNumberProviderImpl(Document document, Project project, String upToDateContent, VirtualFile vf) {
  37     myDocument = document;
  38     myProject = project;
  39     myUpToDateContent = upToDateContent;
  40     myVf = vf;
  41   }
  42
  43   public int getLineNumber(int currentNumber) {
  44     LineStatusTracker tracker = LineStatusTrackerManager.getInstance(myProject).getLineStatusTracker(myDocument);
  45     if (tracker == null) {
  46       tracker = LineStatusTrackerManager.getInstance(myProject).setUpToDateContent(myDocument, myUpToDateContent, myVf);
  47     }
  48     return calcLineNumber(tracker, currentNumber);
  49   }
  50
  51   private boolean endsWithSeparator(final CharSequence string) {
  52     if ((string == null) || (string.length() == 0)) {
  53       return false;
  54     }
  55     final char latest = string.charAt(string.length() - 1);
  56     return ('\n' == latest) || ('\r' == latest);
  57   }
  58
  59   // annotated content is not aware about latest line ends with end-line separator or not. ignore latest separator difference then
  60   private String fixLatestLineSeparator(final Document document, final String content) {
  61     final CharSequence documentSequence = document.getCharsSequence();
  62     if (endsWithSeparator(documentSequence) && (! endsWithSeparator(content))) {
  63       int numCharsToCopy = 1;
  64       final int docLen = documentSequence.length();
  65       if (docLen > 1) {
  66         final char beforeLatest = documentSequence.charAt(docLen - 2);
  67         if (('\r' == beforeLatest) || ('\n' == beforeLatest)) {
  68           numCharsToCopy = 2;
  69         }
  70       }
  71       return content + documentSequence.subSequence(docLen - numCharsToCopy, docLen);
  72     }
  73     return content;
  74   }
  75
  76   private static int calcLineNumber(LineStatusTracker tracker, int currentNumber){
  77     if (tracker == null) return -1;
  78     List ranges = tracker.getRanges();
  79     int result = currentNumber;
  80
  81     for (final Object range1 : ranges) {
  82       Range range = (Range)range1;
  83       int startOffset = range.getOffset1();
  84       int endOffset = range.getOffset2();
  85
  86       if ((startOffset <= currentNumber) && (endOffset > currentNumber)) {
  87         return ABSENT_LINE_NUMBER;
  88       }
  89
  90       if (endOffset > currentNumber) return result;
  91
  92       int currentRangeLength = endOffset - startOffset;
  93
  94       result += range.getUpToDateRangeLength() - currentRangeLength;
  95     }
  96     return result;
  97
  98   }
  99
 100 }
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