org.eclipse.mylyn.internal.wikitext.commonmark.blocks.IndentedCodeBlock.java Source code

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Here is the source code for org.eclipse.mylyn.internal.wikitext.commonmark.blocks.IndentedCodeBlock.java

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/*******************************************************************************
 * Copyright (c) 2015 David Green.
 * 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.commonmark.blocks;

import static com.google.common.base.Preconditions.checkState;

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

import org.eclipse.mylyn.internal.wikitext.commonmark.Line;
import org.eclipse.mylyn.internal.wikitext.commonmark.LinePredicates;
import org.eclipse.mylyn.internal.wikitext.commonmark.LineSequence;
import org.eclipse.mylyn.internal.wikitext.commonmark.ProcessingContext;
import org.eclipse.mylyn.internal.wikitext.commonmark.SourceBlock;
import org.eclipse.mylyn.wikitext.core.parser.Attributes;
import org.eclipse.mylyn.wikitext.core.parser.DocumentBuilder;
import org.eclipse.mylyn.wikitext.core.parser.DocumentBuilder.BlockType;

import com.google.common.base.Predicates;

public class IndentedCodeBlock extends SourceBlock {

    private final Pattern linePattern = Pattern.compile("(?:\\s{0,2}\t|(\\s{4}))(.*)");

    @Override
    public void process(ProcessingContext context, DocumentBuilder builder, LineSequence lineSequence) {
        builder.setLocator(lineSequence.getCurrentLine().toLocator());
        builder.beginBlock(BlockType.CODE, new Attributes());

        boolean blockHasContent = false;
        Iterator<Line> iterator = lineSequence
                .with(Predicates.or(LinePredicates.matches(linePattern), LinePredicates.empty())).iterator();
        while (iterator.hasNext()) {
            Line line = iterator.next();
            Matcher matcher = linePattern.matcher(line.getText());
            if (!matcher.matches()) {
                checkState(line.isEmpty());
                if (iterator.hasNext()) {
                    builder.characters("\n");
                }
            } else {
                String content = matcher.group(2);
                if (!content.isEmpty() || (blockHasContent && iterator.hasNext())) {
                    blockHasContent = true;
                    builder.characters(content);
                    builder.characters("\n");
                }
            }
        }
        builder.endBlock();
    }

    @Override
    public boolean canStart(LineSequence lineSequence) {
        Line line = lineSequence.getCurrentLine();
        return line != null && linePattern.matcher(line.getText()).matches();
    }
}