| /******************************************************************************* |
| * 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 v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * David Green - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.mylyn.internal.wikitext.twiki.core.block; |
| |
| import java.util.Stack; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| import org.eclipse.mylyn.wikitext.core.parser.Attributes; |
| import org.eclipse.mylyn.wikitext.core.parser.DocumentBuilder.BlockType; |
| import org.eclipse.mylyn.wikitext.core.parser.markup.Block; |
| |
| /** |
| * List block, matches blocks that start with <code> *</code>, <code> 1</code>, <code> a</code>, <code> A</code> |
| * <code> i</code> or <code> I</code>. Note that preceding spaces must be in multiples of 3. |
| * |
| * @author David Green |
| */ |
| public class ListBlock extends Block { |
| |
| static final Pattern startPattern = Pattern.compile("((?: {3})+)(\\*|(?:1|a|A|i|I)\\.)\\s(.*+)"); //$NON-NLS-1$ |
| |
| static final Pattern continuationPattern = Pattern.compile(" {3}\\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<>(); |
| Attributes attributes = new Attributes(); |
| String listSpec = matcher.group(1); |
| int level = calculateLevel(listSpec); |
| String typeSpec = matcher.group(2); |
| BlockType type = calculateType(typeSpec); |
| |
| computeAttributes(attributes, type, typeSpec); |
| |
| // 0-offset matches may start with the "*** " prefix. |
| offset = matcher.start(3); |
| |
| listState.push(new ListState(1, type)); |
| builder.beginBlock(type, attributes); |
| |
| adjustLevel(type, listSpec, level); |
| } else { |
| Matcher matcher = startPattern.matcher(line); |
| if (!matcher.matches()) { |
| // FIXME: continuations not yet implemented |
| matcher = continuationPattern.matcher(line); |
| if (listState.isEmpty() || !matcher.matches()) { |
| setClosed(true); |
| return 0; |
| } else { |
| continuation = true; |
| offset = matcher.start(1) - 1; // use -1 to get one whitespace character |
| } |
| } else { |
| String listSpec = matcher.group(1); |
| int level = calculateLevel(listSpec); |
| String typeSpec = matcher.group(2); |
| |
| BlockType type = calculateType(typeSpec); |
| offset = matcher.start(3); |
| |
| adjustLevel(type, typeSpec, level); |
| } |
| } |
| ++blockLineCount; |
| |
| ListState listState = this.listState.peek(); |
| if (!continuation && listState.openItem) { |
| builder.endBlock(); |
| listState.openItem = false; |
| } |
| if (!listState.openItem) { |
| listState.openItem = true; |
| builder.beginBlock(BlockType.LIST_ITEM, new Attributes()); |
| } |
| |
| markupLanguage.emitMarkupLine(getParser(), state, line, offset); |
| |
| return -1; |
| } |
| |
| private void computeAttributes(Attributes attributes, BlockType type, String typeSpec) { |
| if (type == BlockType.NUMERIC_LIST) { |
| switch (typeSpec.charAt(0)) { |
| case 'a': |
| attributes.setCssStyle("list-style: lower-alpha;"); //$NON-NLS-1$ |
| break; |
| case 'A': |
| attributes.setCssStyle("list-style: upper-alpha;"); //$NON-NLS-1$ |
| break; |
| case 'i': |
| attributes.setCssStyle("list-style: lower-roman;"); //$NON-NLS-1$ |
| break; |
| case 'I': |
| attributes.setCssStyle("list-style: upper-roman;"); //$NON-NLS-1$ |
| break; |
| } |
| } |
| } |
| |
| private void adjustLevel(BlockType type, String typeSpec, int level) { |
| for (ListState previousState = listState.peek(); level != previousState.level || previousState.type != type; previousState = listState.peek()) { |
| |
| if (level > previousState.level) { |
| if (!previousState.openItem) { |
| builder.beginBlock(BlockType.LIST_ITEM, new Attributes()); |
| previousState.openItem = true; |
| } |
| |
| Attributes blockAttributes = new Attributes(); |
| computeAttributes(blockAttributes, type, typeSpec); |
| |
| listState.push(new ListState(previousState.level + 1, type)); |
| builder.beginBlock(type, blockAttributes); |
| } else { |
| closeOne(); |
| if (listState.isEmpty()) { |
| Attributes blockAttributes = new Attributes(); |
| computeAttributes(blockAttributes, type, typeSpec); |
| |
| listState.push(new ListState(1, type)); |
| builder.beginBlock(type, blockAttributes); |
| } |
| } |
| } |
| } |
| |
| private int calculateLevel(String listSpec) { |
| return listSpec.length() / 3; |
| } |
| |
| private BlockType calculateType(String listSpec) { |
| return listSpec.charAt(listSpec.length() - 1) == '*' ? BlockType.BULLETED_LIST : BlockType.NUMERIC_LIST; |
| } |
| |
| @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; |
| |
| boolean openItem; |
| |
| private ListState(int level, BlockType type) { |
| super(); |
| this.level = level; |
| this.type = type; |
| } |
| |
| } |
| } |