001package org.hl7.fhir.utilities;
002
003/*
004  Copyright (c) 2011+, HL7, Inc.
005  All rights reserved.
006  
007  Redistribution and use in source and binary forms, with or without modification, 
008  are permitted provided that the following conditions are met:
009    
010   * Redistributions of source code must retain the above copyright notice, this 
011     list of conditions and the following disclaimer.
012   * Redistributions in binary form must reproduce the above copyright notice, 
013     this list of conditions and the following disclaimer in the documentation 
014     and/or other materials provided with the distribution.
015   * Neither the name of HL7 nor the names of its contributors may be used to 
016     endorse or promote products derived from this software without specific 
017     prior written permission.
018  
019  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
020  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
021  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
022  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
023  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
024  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
025  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
026  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
027  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
028  POSSIBILITY OF SUCH DAMAGE.
029  
030 */
031
032
033
034import java.util.Collections;
035import java.util.Set;
036
037import org.commonmark.Extension;
038import org.commonmark.ext.gfm.tables.TablesExtension;
039import org.commonmark.node.Node;
040import org.commonmark.parser.Parser;
041import org.commonmark.renderer.html.HtmlRenderer;
042
043import com.github.rjeschke.txtmark.Processor;
044
045public class MarkDownProcessor {
046
047  public enum Dialect {DARING_FIREBALL, COMMON_MARK};
048  
049  private Dialect dialect;
050  
051  
052  public MarkDownProcessor(Dialect dialect) {
053    super();
054    this.dialect = dialect;
055  }
056
057
058  public String process(String source, String context) {
059    if (source == null) {
060      return null;
061    }
062    if ("".equals(source)) {
063      return "";
064    }
065    switch (dialect) {
066    case DARING_FIREBALL : return Processor.process(source); 
067    case COMMON_MARK : return processCommonMark(source); 
068    default: throw new Error("Unknown Markdown Dialect: "+dialect.toString()+" at "+context); 
069    }
070  }
071
072  private String processCommonMark(String source) {
073    Set<Extension> extensions = Collections.singleton(TablesExtension.create());
074    Parser parser = Parser.builder().extensions(extensions).build();
075    Node document = parser.parse(source);
076    HtmlRenderer renderer = HtmlRenderer.builder().extensions(extensions).build();
077    String html = renderer.render(document);
078    html = html.replace("<table>", "<table class=\"grid\">");
079    return html;  
080  }
081
082
083  public static boolean isSimpleMarkdown(String description) {
084    return !description.contains("\n");
085  }
086  
087}