| /******************************************************************************* |
| * Copyright (c) 2007, 2008 David Green and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * David Green - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.mylyn.wikitext.tracwiki.internal.block; |
| |
| import java.util.Stack; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| import org.eclipse.mylyn.wikitext.parser.Attributes; |
| import org.eclipse.mylyn.wikitext.parser.DocumentBuilder.BlockType; |
| import org.eclipse.mylyn.wikitext.parser.markup.Block; |
| |
| /** |
| * quoted text block, matches blocks that start with <code>></code> or two spaces. These are what they call |
| * discussion citations and block quotes, respectively. Creates an extended block type of {@link ParagraphBlock |
| * paragraph}. |
| * |
| * @author David Green |
| */ |
| public class QuoteBlock extends Block { |
| |
| static final Pattern startPattern = Pattern.compile("(?:(?:(>+)\\s+)|( ))(.*)"); //$NON-NLS-1$ |
| |
| private int blockLineCount = 0; |
| |
| private Matcher matcher; |
| |
| private Stack<BlockState> quoteBlockState; |
| |
| public QuoteBlock() { |
| } |
| |
| @Override |
| public int processLineContent(String line, int offset) { |
| if (blockLineCount == 0) { |
| quoteBlockState = new Stack<BlockState>(); |
| } else { |
| matcher = startPattern.matcher(line); |
| if (!matcher.matches()) { |
| setClosed(true); |
| return 0; |
| } |
| } |
| String quoteStartGroup = matcher.group(1); |
| int level = quoteStartGroup == null ? 1 : quoteStartGroup.length(); |
| offset = matcher.start(3); |
| |
| while (quoteBlockState.size() > level) { |
| closeOne(); |
| } |
| while (quoteBlockState.size() < level) { |
| openOne(new Attributes()); |
| } |
| |
| BlockState blockState = quoteBlockState.peek(); |
| if (!blockState.paraOpen) { |
| builder.beginBlock(BlockType.PARAGRAPH, new Attributes()); |
| blockState.paraOpen = true; |
| } else if (blockLineCount != 0) { |
| builder.lineBreak(); |
| } |
| ++blockLineCount; |
| |
| getMarkupLanguage().emitMarkupLine(getParser(), state, line, offset); |
| |
| return -1; |
| } |
| |
| private void openOne(Attributes attributes) { |
| if (!quoteBlockState.isEmpty()) { |
| BlockState blockState = quoteBlockState.peek(); |
| if (blockState.paraOpen) { |
| blockState.paraOpen = false; |
| builder.endBlock(); |
| } |
| } |
| builder.beginBlock(BlockType.QUOTE, attributes); |
| quoteBlockState.push(new BlockState()); |
| } |
| |
| @Override |
| public boolean canStart(String line, int lineOffset) { |
| quoteBlockState = null; |
| blockLineCount = 0; |
| matcher = startPattern.matcher(line); |
| if (lineOffset > 0) { |
| matcher.region(lineOffset, line.length()); |
| } |
| return matcher.matches(); |
| } |
| |
| @Override |
| public void setClosed(boolean closed) { |
| if (closed && !isClosed()) { |
| while (quoteBlockState != null && !quoteBlockState.isEmpty()) { |
| closeOne(); |
| } |
| quoteBlockState = null; |
| } |
| super.setClosed(closed); |
| } |
| |
| private void closeOne() { |
| BlockState blockState = quoteBlockState.pop(); |
| if (blockState.paraOpen) { |
| builder.endBlock(); // para |
| } |
| builder.endBlock(); // quote |
| } |
| |
| private static class BlockState { |
| boolean paraOpen; |
| } |
| } |