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Doxia module for Textile source documents
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/*
 * Copyright © 2012 Sebastian Hoß 
 * This work is free. You can redistribute it and/or modify it under the
 * terms of the Do What The Fuck You Want To Public License, Version 2,
 * as published by Sam Hocevar. See http://www.wtfpl.net/ for more details.
 */
package com.github.sebhoss.doxia;

import java.io.IOException;
import java.io.Reader;

import org.apache.maven.doxia.parser.AbstractTextParser;
import org.apache.maven.doxia.parser.ParseException;
import org.apache.maven.doxia.parser.Parser;
import org.apache.maven.doxia.sink.Sink;
import org.codehaus.plexus.component.annotations.Component;
import org.eclipse.mylyn.wikitext.core.parser.MarkupParser;
import org.eclipse.mylyn.wikitext.textile.core.TextileLanguage;

import com.google.common.base.Preconditions;
import com.google.common.io.CharStreams;

/**
 * Doxia parser for Textile documents.
 */
@SuppressWarnings("nls")
@Component(role = Parser.class, hint = "textile")
public class TextileParser extends AbstractTextParser {

    /**
     * Constructor for a new Doxia Textile parser.
     */
    public TextileParser() {
        // empty constructor to make Checkstyle happy.
    }

    @Override
    public void parse(final Reader reader, final Sink sink) throws ParseException {
        Preconditions.checkNotNull(reader, "Cannot read from NULL reader");
        Preconditions.checkNotNull(sink, "Cannot write into NULL sink");

        final String textileContent = TextileParser.readTextileContent(reader);
        final String htmlContent = TextileParser.parseToHtml(textileContent);

        sink.rawText(htmlContent);
        sink.flush();
        sink.close();
    }

    private static String readTextileContent(final Reader reader) throws ParseException {
        try (Reader autoClosedReader = reader) {
            return CharStreams.toString(autoClosedReader);
        } catch (final IOException exception) {
            throw new ParseException("Cannot read input", exception);
        }
    }

    private static String parseToHtml(final String markupContent) {
        Preconditions.checkNotNull(markupContent, "Cannot parse NULL Textile content to HTML!");
        Preconditions.checkArgument(!markupContent.isEmpty(), "Cannot parse empty Textile content to HTML!");

        final MarkupParser markupParser = TextileParser.createMarkupParser();

        return markupParser.parseToHtml(markupContent);
    }

    private static MarkupParser createMarkupParser() {
        final MarkupParser markupParser = new MarkupParser();
        markupParser.setMarkupLanguage(new TextileLanguage());

        return markupParser;
    }

}