| /* |
| * Copyright 2000-2013 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.util.text; |
| |
| import org.jetbrains.annotations.Nullable; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| public class LineReader { |
| private int myPos = -1; |
| private final int[] myBuffer = new int[2]; |
| private final InputStream myInputStream; |
| private boolean myAtEnd = false; |
| |
| public LineReader(InputStream in) { |
| myInputStream = in; |
| } |
| |
| public List<byte[]> readLines() throws IOException { |
| |
| ArrayList<byte[]> result = new ArrayList<byte[]>(); |
| byte[] line; |
| while ((line = readLineInternal()) != null) result.add(line); |
| return result; |
| } |
| |
| private int read() throws IOException { |
| if (myPos >= 0) { |
| int result = myBuffer[myPos]; |
| myPos--; |
| return result; |
| } |
| return myInputStream.read(); |
| } |
| |
| private class ReadLine { |
| private String myCurrentEOL = ""; |
| private ByteArrayOutputStream myResult = null; |
| |
| @Nullable |
| public byte[] execute() throws IOException { |
| |
| if (myAtEnd) return null; |
| |
| synchronized (myInputStream) { |
| while (true) { |
| int ch = read(); |
| if (ch < 0) |
| return processEndOfStream(); |
| if (notLineSeparator(ch)) { |
| if (myCurrentEOL.equals("\r")) { |
| unread(ch); |
| return getResult(); |
| } else if (myCurrentEOL.equals("\r\r")) { |
| unread(ch); |
| unread('\r'); |
| return getResult(); |
| } else { |
| appendToResult(ch); |
| continue; |
| } |
| } |
| if (ch == '\r') { |
| if (myCurrentEOL.isEmpty() || myCurrentEOL.equals("\r")) { |
| myCurrentEOL += "\r"; |
| } else if (myCurrentEOL.equals("\r\r")) { |
| unread('\r'); |
| unread('\r'); |
| return getResult(); |
| } |
| continue; |
| } |
| if (ch == '\n') { |
| return getResult(); |
| } |
| } |
| } |
| } |
| |
| private boolean notLineSeparator(int ch) { |
| return ch != '\r' && ch != '\n'; |
| } |
| |
| private void appendToResult(int ch) { |
| createResult(); |
| myResult.write(ch); |
| } |
| |
| private byte[] getResult() { |
| createResult(); |
| try { |
| myResult.flush(); |
| } catch (IOException e) { |
| //ignore |
| } |
| |
| return myResult.toByteArray(); |
| } |
| |
| private void createResult() { |
| if (myResult == null) myResult = new ByteArrayOutputStream(); |
| } |
| |
| private byte[] processEndOfStream() { |
| myAtEnd = true; |
| return getResult(); |
| } |
| } |
| |
| @Nullable |
| private byte[] readLineInternal() throws IOException { |
| return new ReadLine().execute(); |
| } |
| |
| private void unread(int b) throws IOException { |
| myPos++; |
| if (myPos >= myBuffer.length) |
| throw new IOException("Push back buffer is full"); |
| myBuffer[myPos] = b; |
| |
| } |
| } |