ThematicBreakBlock.java example

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docmlet-master
/*=============================================================================#
 # Copyright (c) 2015-2016 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 in Mylyn
 #     Stephan Wahlbrink (WalWare.de) - revised API and implementation
 #=============================================================================*/

package de.walware.docmlet.wikitext.internal.commonmark.core.blocks;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.eclipse.mylyn.wikitext.core.parser.DocumentBuilder;

import de.walware.docmlet.wikitext.internal.commonmark.core.CommonmarkLocator;
import de.walware.docmlet.wikitext.internal.commonmark.core.Line;
import de.walware.docmlet.wikitext.internal.commonmark.core.LineSequence;
import de.walware.docmlet.wikitext.internal.commonmark.core.ProcessingContext;
import de.walware.docmlet.wikitext.internal.commonmark.core.SourceBlock;
import de.walware.docmlet.wikitext.internal.commonmark.core.SourceBlockItem;
import de.walware.docmlet.wikitext.internal.commonmark.core.SourceBlocks.SourceBlockBuilder;


/**
 * CM Thematic Break (= Horizontal Rule)
 */
public class ThematicBreakBlock extends SourceBlock {
	
	
	private static final Pattern PATTERN= Pattern.compile(
			"(?:\\*[ \t]*){3,}|(?:-[ \t]*){3,}|(?:_[ \t]*){3,}",
			Pattern.DOTALL );
	
	
	private final Matcher matcher= PATTERN.matcher("");
	
	
	public ThematicBreakBlock() {
	}
	
	
	@Override
	public boolean canStart(final LineSequence lineSequence, final SourceBlockItem<?> currentBlockItem) {
		return canStart(lineSequence.getCurrentLine());
	}
	
	public boolean canStart(final Line currentLine) {
		return (currentLine != null
				&& !currentLine.isBlank() && currentLine.getIndent() < 4
				&& currentLine.setupIndent(this.matcher).matches() );
	}
	
	@Override
	public void createItem(final SourceBlockBuilder builder, final LineSequence lineSequence) {
		final SourceBlockItem<ThematicBreakBlock> blockItem= new SourceBlockItem<>(this, builder);
		
		lineSequence.advance();
	}
	
	@Override
	public void initializeContext(final ProcessingContext context, final SourceBlockItem<?> blockItem) {
	}
	
	@Override
	public void emit(final ProcessingContext context, final SourceBlockItem<?> blockItem,
			final CommonmarkLocator locator, final DocumentBuilder builder) {
		locator.setBlockBegin(blockItem);
		builder.horizontalRule();
	}
	
}