org.eclipse.mylyn.internal.wikitext.commonmark.inlines.CodeSpan.java Source code

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Here is the source code for org.eclipse.mylyn.internal.wikitext.commonmark.inlines.CodeSpan.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.inlines;

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

import com.google.common.base.Optional;
import com.google.common.base.Strings;

public class CodeSpan extends SourceSpan {

    Pattern pattern = Pattern.compile("(`+).*", Pattern.DOTALL | Pattern.MULTILINE);

    @Override
    public Optional<? extends Inline> createInline(Cursor cursor) {
        char c = cursor.getChar();
        if (c == '`') {
            Matcher matcher = cursor.matcher(pattern);
            if (matcher.matches()) {
                String openingBackticks = matcher.group(1);
                int backtickCount = openingBackticks.length();
                Pattern closingPattern = Pattern.compile(
                        "(?<!`)(" + Strings.repeat("`", backtickCount) + ")([^`]|$)",
                        Pattern.DOTALL | Pattern.MULTILINE);
                cursor.advance(backtickCount);
                String textAtOffset = cursor.getTextAtOffset();
                cursor.rewind(backtickCount);

                Matcher closingMatcher = closingPattern.matcher(textAtOffset);
                if (closingMatcher.find()) {
                    String codeText = textAtOffset.substring(0, closingMatcher.start());
                    return Optional
                            .of(new Code(cursor.getLineAtOffset(), cursor.getOffset(), backtickCount, codeText));
                }
            }
        }
        return Optional.absent();
    }
}