| /* |
| * Copyright 2000-2012 JetBrains s.r.o. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.intellij.openapi.vcs; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Created with IntelliJ IDEA. |
| * User: Irina.Chernushina |
| * Date: 1/25/12 |
| * Time: 5:03 PM |
| */ |
| public class LineHandlerHelper { |
| /** |
| * Split text into lines. New line characters are treated as separators. So if the text starts |
| * with newline, empty string will be the first element, if the text ends with new line, the |
| * empty string will be the last element. The returned lines will be substrings of |
| * the text argument. The new line characters are included into the line text. |
| * |
| * @param text a text to split |
| * @return a list of elements (note that there are always at least one element) |
| */ |
| public static List<String> splitText(String text) { |
| int startLine = 0; |
| int i = 0; |
| int n = text.length(); |
| ArrayList<String> rc = new ArrayList<String>(); |
| while (i < n) { |
| switch (text.charAt(i)) { |
| case '\n': |
| i++; |
| if (i < n && text.charAt(i) == '\r') { |
| i++; |
| } |
| rc.add(text.substring(startLine, i)); |
| startLine = i; |
| break; |
| case '\r': |
| i++; |
| if (i < n && text.charAt(i) == '\n') { |
| i++; |
| } |
| rc.add(text.substring(startLine, i)); |
| startLine = i; |
| break; |
| default: |
| i++; |
| } |
| } |
| if (startLine == text.length()) { |
| // still add empty line or previous line wouldn't be treated as completed |
| rc.add(""); |
| } else { |
| rc.add(text.substring(startLine, i)); |
| } |
| return rc; |
| } |
| |
| /** |
| * Trim line separator from new line if it presents |
| * |
| * @param line a line to process |
| * @return a trimmed line |
| */ |
| public static String trimLineSeparator(String line) { |
| int n = line.length(); |
| if (n == 0) { |
| return line; |
| } |
| char ch = line.charAt(n - 1); |
| if (ch == '\n' || ch == '\r') { |
| n--; |
| } |
| else { |
| return line; |
| } |
| if (n > 0) { |
| char ch2 = line.charAt(n - 1); |
| if ((ch2 == '\n' || ch2 == '\r') && ch2 != ch) { |
| n--; |
| } |
| } |
| return line.substring(0, n); |
| |
| } |
| } |