| /* |
| * Copyright 2000-2014 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.diff; |
| |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| import java.util.List; |
| |
| public abstract class LineTokenizerBase<T> { |
| private int myIndex = 0; |
| private int myLineSeparatorStart = -1; |
| private int myLineSeparatorEnd = -1; |
| |
| protected abstract void addLine(List<T> lines, int start, int end, boolean appendNewLine); |
| |
| protected abstract char charAt(int index); |
| |
| protected abstract int length(); |
| |
| @NotNull |
| protected abstract String substring(int start, int end); |
| |
| public void doExecute(List<T> lines) { |
| while (notAtEnd()) { |
| int begin = myIndex; |
| skipToEOL(); |
| int endIndex = myIndex; |
| boolean appendNewLine = false; |
| |
| if (notAtEnd() && isAtEOL()) { |
| if (charAt(endIndex) == '\n') { |
| endIndex++; |
| } |
| else { |
| appendNewLine = true; |
| } |
| skipEOL(); |
| } |
| |
| addLine(lines, begin, endIndex, appendNewLine); |
| } |
| } |
| |
| private void skipEOL() { |
| int eolStart = myIndex; |
| boolean nFound = false; |
| boolean rFound = false; |
| while (notAtEnd()) { |
| boolean n = charAt(myIndex) == '\n'; |
| boolean r = charAt(myIndex) == '\r'; |
| if (!n && !r) { |
| break; |
| } |
| if ((nFound && n) || (rFound && r)) { |
| break; |
| } |
| nFound |= n; |
| rFound |= r; |
| myIndex++; |
| } |
| if (myLineSeparatorStart == -1) { |
| myLineSeparatorStart = eolStart; |
| myLineSeparatorEnd = myIndex; |
| } |
| } |
| |
| @Nullable |
| public String getLineSeparator() { |
| if (myLineSeparatorStart == -1) return null; |
| return substring(myLineSeparatorStart, myLineSeparatorEnd); |
| } |
| |
| private void skipToEOL() { |
| while (notAtEnd() && !isAtEOL()) { |
| myIndex++; |
| } |
| } |
| |
| private boolean notAtEnd() { |
| return myIndex < length(); |
| } |
| |
| private boolean isAtEOL() { |
| return charAt(myIndex) == '\r' || charAt(myIndex) == '\n'; |
| } |
| } |