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

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

public class HtmlEntitySpan extends SourceSpan {

    private final Pattern pattern = Pattern.compile("&(#x[a-f0-9]{1,8}|#[0-9]{1,8}|[a-z][a-z0-9]{1,31});.*",
            Pattern.CASE_INSENSITIVE | Pattern.DOTALL);

    @Override
    public Optional<? extends Inline> createInline(Cursor cursor) {
        char c = cursor.getChar();
        if (c == '&') {
            Matcher matcher = cursor.matcher(pattern);
            if (matcher.matches()) {
                String ent = matcher.group(1);
                return Optional
                        .of(new HtmlEntity(cursor.getLineAtOffset(), cursor.getOffset(), ent.length() + 2, ent));
            }
        }
        return Optional.absent();
    }
}