| /*=============================================================================# |
| # Copyright (c) 2015, 2018 David Green and others. |
| # |
| # This program and the accompanying materials are made available under the |
| # terms of the Eclipse Public License 2.0 which is available at |
| # https://www.eclipse.org/legal/epl-2.0. |
| # |
| # SPDX-License-Identifier: EPL-2.0 |
| # |
| # Contributors: |
| # David Green - org.eclipse.mylyn.docs: initial API and implementation |
| # Stephan Wahlbrink <sw@wahlbrink.eu> - initial API and implementation |
| #=============================================================================*/ |
| |
| package org.eclipse.statet.internal.docmlet.wikitext.commonmark.core; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.eclipse.jface.text.BadLocationException; |
| |
| import org.eclipse.statet.ecommons.text.core.ILineInformation; |
| |
| |
| public class ContentLineSequence extends LineSequence { |
| |
| |
| private final String content; |
| private final ILineInformation lineInfos; |
| |
| private Line currentLine; |
| |
| private final List<Line> followingLines= new ArrayList<>(); |
| |
| |
| public ContentLineSequence(final String content, final ILineInformation lineInfos) { |
| this.content= content; |
| this.lineInfos= lineInfos; |
| |
| this.currentLine= createLine(0); |
| } |
| |
| |
| private Line createLine(final int lineNumber) { |
| if (lineNumber >= this.lineInfos.getNumberOfLines()) { |
| return null; |
| } |
| try { |
| final int startOffset= this.lineInfos.getLineOffset(lineNumber); |
| int endOffset= this.lineInfos.getLineEndOffset(lineNumber); |
| final String delimiter; |
| switch ((endOffset > startOffset) ? this.content.charAt(endOffset - 1) : 0) { |
| case '\n': |
| endOffset--; |
| if (endOffset > startOffset && this.content.charAt(endOffset - 1) == '\r') { |
| endOffset--; |
| delimiter= "\r\n"; |
| } |
| else { |
| delimiter= "\n"; |
| } |
| break; |
| case '\r': |
| endOffset--; |
| delimiter= "\r"; |
| break; |
| default: |
| delimiter= ""; |
| break; |
| } |
| |
| return new Line(lineNumber, startOffset, 0, this.content.substring(startOffset, endOffset), delimiter); |
| } |
| catch (final BadLocationException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| @Override |
| public Line getCurrentLine() { |
| return this.currentLine; |
| } |
| |
| @Override |
| public Line getNextLine() { |
| return getNextLine(0); |
| } |
| |
| public Line getNextLine(final int index) { |
| checkArgument(index >= 0); |
| if (this.currentLine != null) { |
| while (index >= this.followingLines.size()) { |
| final Line line= createLine(this.currentLine.getLineNumber() + this.followingLines.size() + 1); |
| if (line == null) { |
| break; |
| } |
| this.followingLines.add(line); |
| } |
| } |
| return (index < this.followingLines.size()) ? this.followingLines.get(index) : null; |
| } |
| |
| @Override |
| public void advance() { |
| this.currentLine= getNextLine(0); |
| if (this.currentLine != null) { |
| this.followingLines.remove(0); |
| } |
| } |
| |
| @Override |
| public LineSequence lookAhead() { |
| return new LookAheadLineSequence(this); |
| } |
| |
| } |