| /******************************************************************************* |
| * Copyright (c) 2011 Igor Malinin 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: |
| * Igor Malinin - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.mylyn.wikitext.creole.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; |
| |
| /** |
| * List block, matches blocks that start with <code>*</code> or <code>#</code> |
| * |
| * @author Igor Malinin |
| */ |
| public class ListBlock extends Block { |
| |
| static final Pattern pattern = Pattern.compile("\\s*((?:[*]+)|(?:#+))\\s*(.+)"); //$NON-NLS-1$ |
| |
| private int blockLineCount = 0; |
| |
| private Matcher matcher; |
| |
| private Stack<ListState> listState; |
| |
| public ListBlock() { |
| } |
| |
| @Override |
| public int processLineContent(String line, int offset) { |
| boolean continuation = false; |
| if (blockLineCount == 0) { |
| listState = new Stack<ListState>(); |
| String listSpec = matcher.group(1); |
| int level = calculateLevel(listSpec); |
| BlockType type = calculateType(listSpec.charAt(0)); |
| |
| offset = matcher.start(2); |
| |
| listState.push(new ListState(1, type)); |
| builder.beginBlock(type, new Attributes()); |
| |
| adjustLevel(level, type); |
| } else { |
| Matcher matcher = pattern.matcher(line); |
| if (!matcher.matches()) { |
| setClosed(true); |
| return 0; |
| } |
| String listSpec = matcher.group(1); |
| int lineLevel = calculateLevel(listSpec); |
| BlockType type = calculateType(listSpec.charAt(0)); |
| |
| offset = matcher.start(2); |
| |
| continuation = adjustLevel(lineLevel, type); |
| } |
| ++blockLineCount; |
| |
| ListState listState = this.listState.peek(); |
| if (!continuation && listState.openItem) { |
| listState.openItem = false; |
| builder.endBlock(); |
| } |
| if (!listState.openItem) { |
| listState.openItem = true; |
| builder.beginBlock(BlockType.LIST_ITEM, new Attributes()); |
| } |
| |
| markupLanguage.emitMarkupLine(getParser(), state, line, offset); |
| |
| return -1; |
| } |
| |
| /** |
| * @return true if the item is a continuation |
| */ |
| private boolean adjustLevel(int lineLevel, BlockType type) { |
| boolean continuation = false; |
| |
| for (ListState previousState = listState.peek(); lineLevel != previousState.level || previousState.type != type; previousState = listState.peek()) { |
| if (lineLevel > previousState.level) { |
| if (!previousState.openItem) { |
| builder.beginBlock(BlockType.LIST_ITEM, new Attributes()); |
| previousState.openItem = true; |
| } |
| |
| listState.push(new ListState(previousState.level + 1, type)); |
| builder.beginBlock(type, new Attributes()); |
| } else if (lineLevel == previousState.level && previousState.type == type) { |
| if (previousState.openItem) { |
| builder.endBlock(); |
| previousState.openItem = false; |
| } |
| } else { |
| closeOne(); |
| if (listState.isEmpty()) { |
| listState.push(new ListState(1, type)); |
| builder.beginBlock(type, new Attributes()); |
| } |
| } |
| } |
| |
| return continuation; |
| } |
| |
| private int calculateLevel(String listSpec) { |
| return listSpec.length(); |
| } |
| |
| private BlockType calculateType(char ch) { |
| return (ch == '#') ? BlockType.NUMERIC_LIST : BlockType.BULLETED_LIST; |
| } |
| |
| @Override |
| public boolean canStart(String line, int lineOffset) { |
| blockLineCount = 0; |
| listState = null; |
| if (lineOffset == 0) { |
| matcher = pattern.matcher(line); |
| if (matcher.matches()) { |
| String listSpec = matcher.group(1); |
| if (calculateLevel(listSpec) == 1) { |
| return true; |
| } |
| } |
| } |
| matcher = null; |
| return false; |
| } |
| |
| @Override |
| public void setClosed(boolean closed) { |
| if (closed && !isClosed()) { |
| while (listState != null && !listState.isEmpty()) { |
| closeOne(); |
| } |
| listState = null; |
| } |
| super.setClosed(closed); |
| } |
| |
| private void closeOne() { |
| ListState e = listState.pop(); |
| if (e.openItem) { |
| builder.endBlock(); |
| } |
| builder.endBlock(); |
| } |
| |
| private static class ListState { |
| int level; |
| |
| BlockType type; |
| |
| boolean openItem; |
| |
| private ListState(int level, BlockType type) { |
| super(); |
| this.level = level; |
| this.type = type; |
| } |
| |
| } |
| } |