| /******************************************************************************* |
| * Copyright (c) 2007, 2011 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.mediawiki.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>, <code>#</code> or <code>;:</code> |
| * |
| * @author David Green |
| * @see <a href="http://www.mediawiki.org/wiki/Help:Formatting">Help:Formatting</a> |
| */ |
| public class ListBlock extends Block { |
| |
| private static final int LINE_REMAINDER_GROUP_OFFSET = 2; |
| |
| static final Pattern startPattern = Pattern.compile("((?:(?:\\*)|(?:#)|(?:\\;)|(?:\\:))+)\\s?(.+)"); //$NON-NLS-1$ |
| |
| static final Pattern definitionPattern = 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>(); |
| Attributes attributes = new Attributes(); |
| String listSpec = matcher.group(1); |
| char lastChar = listSpec.charAt(listSpec.length() - 1); |
| int level = calculateLevel(listSpec); |
| BlockType type = calculateType(lastChar); |
| BlockType itemType = calculateItemType(lastChar); |
| |
| if (type == BlockType.BULLETED_LIST && '-' == lastChar) { |
| attributes.setCssStyle("list-style: square"); //$NON-NLS-1$ |
| } |
| |
| offset = matcher.start(LINE_REMAINDER_GROUP_OFFSET); |
| |
| listState.push(new ListState(1, type, itemType)); |
| builder.beginBlock(type, attributes); |
| |
| adjustLevel(lastChar, level, type, itemType); |
| } else { |
| Matcher matcher = startPattern.matcher(line); |
| if (!matcher.matches()) { |
| setClosed(true); |
| return 0; |
| } |
| String listSpec = matcher.group(1); |
| char lastChar = listSpec.charAt(listSpec.length() - 1); |
| int lineLevel = calculateLevel(listSpec); |
| BlockType type = calculateType(lastChar); |
| BlockType itemType = calculateItemType(lastChar); |
| |
| offset = matcher.start(LINE_REMAINDER_GROUP_OFFSET); |
| |
| continuation = adjustLevel(lastChar, lineLevel, type, itemType); |
| } |
| ++blockLineCount; |
| |
| ListState listState = this.listState.peek(); |
| if (!continuation && listState.openItem) { |
| listState.openItem = false; |
| builder.endBlock(); |
| } |
| if (!listState.openItem) { |
| listState.openItem = true; |
| builder.beginBlock(listState.itemType, new Attributes()); |
| } |
| |
| String definition = null; |
| int definitionOffset = -1; |
| if (listState.itemType == BlockType.DEFINITION_TERM) { |
| // detect definition on same line as term |
| Matcher definitionMatcher = definitionPattern.matcher(line); |
| if (offset > 0) { |
| definitionMatcher.region(offset, line.length()); |
| } |
| if (definitionMatcher.find()) { |
| line = line.substring(offset, definitionMatcher.start(1)); |
| offset = 0; |
| definition = definitionMatcher.group(2); |
| definitionOffset = definitionMatcher.start(2); |
| } |
| } |
| if (definition == null) { |
| markupLanguage.emitMarkupLine(getParser(), state, line, offset); |
| } else { |
| markupLanguage.emitMarkupLine(getParser(), state, offset, line, 0); |
| } |
| |
| if (definition != null) { |
| listState.openItem = false; |
| builder.endBlock(); |
| |
| adjustLevel(' ', listState.level, BlockType.DEFINITION_LIST, BlockType.DEFINITION_ITEM); |
| |
| listState = this.listState.peek(); |
| if (listState.openItem) { |
| builder.endBlock(); |
| } |
| listState.openItem = true; |
| builder.beginBlock(listState.itemType, new Attributes()); |
| |
| markupLanguage.emitMarkupLine(parser, state, definitionOffset, definition, 0); |
| } |
| |
| return -1; |
| } |
| |
| /** |
| * @param lastChar |
| * the last character of the list specification, or ' ' if unknown |
| * @return true if the item is a continuation |
| */ |
| private boolean adjustLevel(char lastChar, int lineLevel, BlockType type, BlockType itemType) { |
| boolean continuation = false; |
| |
| for (ListState previousState = listState.peek(); lineLevel != previousState.level || previousState.type != type |
| || previousState.itemType != itemType; previousState = listState.peek()) { |
| |
| if (lineLevel > previousState.level) { |
| if (!previousState.openItem) { |
| builder.beginBlock(previousState.itemType, new Attributes()); |
| previousState.openItem = true; |
| } |
| |
| Attributes blockAttributes = new Attributes(); |
| if (type == BlockType.BULLETED_LIST && '-' == lastChar) { |
| blockAttributes.setCssStyle("list-style: square"); //$NON-NLS-1$ |
| } |
| listState.push(new ListState(previousState.level + 1, type, itemType)); |
| builder.beginBlock(type, blockAttributes); |
| } else if (lineLevel == previousState.level && previousState.type == type |
| && previousState.itemType != itemType) { |
| if (previousState.openItem) { |
| builder.endBlock(); |
| previousState.openItem = false; |
| } |
| previousState.itemType = itemType; |
| } else { |
| if (lineLevel == previousState.level && lastChar == ':') { |
| // this is possibly a continuation of the previous item. |
| if (previousState.itemType != BlockType.DEFINITION_ITEM |
| && previousState.itemType != BlockType.DEFINITION_TERM) { |
| // we found a continuation |
| continuation = true; |
| break; |
| } |
| } |
| closeOne(); |
| if (listState.isEmpty()) { |
| Attributes blockAttributes = new Attributes(); |
| if (type == BlockType.BULLETED_LIST && '-' == lastChar) { |
| blockAttributes.setCssStyle("list-style: square"); //$NON-NLS-1$ |
| } |
| listState.push(new ListState(1, type, itemType)); |
| builder.beginBlock(type, blockAttributes); |
| } |
| } |
| } |
| |
| return continuation; |
| } |
| |
| private int calculateLevel(String listSpec) { |
| return listSpec.length(); |
| } |
| |
| private BlockType calculateType(char lastChar) { |
| switch (lastChar) { |
| case '#': |
| return BlockType.NUMERIC_LIST; |
| case ':': |
| case ';': |
| return BlockType.DEFINITION_LIST; |
| default: |
| return BlockType.BULLETED_LIST; |
| } |
| } |
| |
| private BlockType calculateItemType(char lastChar) { |
| switch (lastChar) { |
| case ';': |
| return BlockType.DEFINITION_TERM; |
| case ':': |
| return BlockType.DEFINITION_ITEM; |
| default: |
| return BlockType.LIST_ITEM; |
| } |
| } |
| |
| @Override |
| public boolean canStart(String line, int lineOffset) { |
| blockLineCount = 0; |
| listState = null; |
| if (lineOffset == 0) { |
| matcher = startPattern.matcher(line); |
| return matcher.matches(); |
| } else { |
| 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; |
| |
| BlockType itemType; |
| |
| boolean openItem; |
| |
| private ListState(int level, BlockType type, BlockType itemType) { |
| super(); |
| this.level = level; |
| this.type = type; |
| this.itemType = itemType; |
| } |
| |
| } |
| } |