platform/lang-impl/src/com/intellij/codeInsight/CommentUtil.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
  17 package com.intellij.codeInsight;
  18
  19 import com.intellij.psi.codeStyle.Indent;
  20 import com.intellij.psi.codeStyle.CodeStyleManager;
  21 import com.intellij.openapi.project.Project;
  22 import com.intellij.openapi.editor.Document;
  23 import com.intellij.openapi.fileTypes.FileType;
  24 import com.intellij.util.text.CharArrayUtil;
  25
  26 public class CommentUtil {
  27   private CommentUtil() {
  28   }
  29
  30   public static Indent getMinLineIndent(Project project, Document document, int line1, int line2, FileType fileType) {
  31     CharSequence chars = document.getCharsSequence();
  32     CodeStyleManager codeStyleManager = CodeStyleManager.getInstance(project);
  33     Indent minIndent = null;
  34     for (int line = line1; line <= line2; line++) {
  35       int lineStart = document.getLineStartOffset(line);
  36       int textStart = CharArrayUtil.shiftForward(chars, lineStart, " \t");
  37       if (textStart >= document.getTextLength()) {
  38         textStart = document.getTextLength();
  39       }
  40       else {
  41         char c = chars.charAt(textStart);
  42         if (c == '\n' || c == '\r') continue; // empty line
  43       }
  44       String space = chars.subSequence(lineStart, textStart).toString();
  45       Indent indent = codeStyleManager.getIndent(space, fileType);
  46       minIndent = minIndent != null ? indent.min(minIndent) : indent;
  47     }
  48     if (minIndent == null && line1 == line2 && line1 < document.getLineCount() - 1) {
  49       return getMinLineIndent(project, document, line1 + 1, line1 + 1, fileType);
  50     }
  51     //if (minIndent == Integer.MAX_VALUE){
  52     //  minIndent = 0;
  53     //}
  54     return minIndent;
  55   }
  56 }