package org.jsoup.nodes;

import org.jsoup.Jsoup;
import org.jsoup.parser.Parser;

import java.io.IOException;

A comment node.
Author:
Jonathan Hedley, jonathan@hedley.net/**
 A comment node.

 @author Jonathan Hedley, jonathan@hedley.net */
public class Comment extends LeafNode {
    
Create a new comment node.
Params:
data – The contents of the comment/**
     Create a new comment node.
     @param data The contents of the comment
     */
    public Comment(String data) {
        value = data;
    }

    public String nodeName() {
        return "#comment";
    }

    
Get the contents of the comment.
Returns:
comment content/**
     Get the contents of the comment.
     @return comment content
     */
    public String getData() {
        return coreValue();
    }

    public Comment setData(String data) {
        coreValue(data);
        return this;
    }

	void outerHtmlHead(Appendable accum, int depth, Document.OutputSettings out) throws IOException {
        if (out.prettyPrint() && ((siblingIndex() == 0 && parentNode instanceof Element && ((Element) parentNode).tag().formatAsBlock()) || (out.outline() )))
            indent(accum, depth, out);
        accum
                .append("<!--")
                .append(getData())
                .append("-->");
    }

	void outerHtmlTail(Appendable accum, int depth, Document.OutputSettings out) {}

    @Override
    public String toString() {
        return outerHtml();
    }

    @Override
    public Comment clone() {
        return (Comment) super.clone();
    }

    
Check if this comment looks like an XML Declaration.
Returns:
true if it looks like, maybe, it's an XML Declaration./**
     * Check if this comment looks like an XML Declaration.
     * @return true if it looks like, maybe, it's an XML Declaration.
     */
    public boolean isXmlDeclaration() {
        String data = getData();
        return (data.length() > 1 && (data.startsWith("!") || data.startsWith("?")));
    }

    
Attempt to cast this comment to an XML Declaration note.
Returns:
an XML declaration if it could be parsed as one, null otherwise./**
     * Attempt to cast this comment to an XML Declaration note.
     * @return an XML declaration if it could be parsed as one, null otherwise.
     */
    public XmlDeclaration asXmlDeclaration() {
        String data = getData();
        Document doc = Jsoup.parse("<" + data.substring(1, data.length() -1) + ">", baseUri(), Parser.xmlParser());
        XmlDeclaration decl = null;
        if (doc.children().size() > 0) {
            Element el = doc.child(0);
            decl = new XmlDeclaration(NodeUtils.parser(doc).settings().normalizeTag(el.tagName()), data.startsWith("!"));
            decl.attributes().addAll(el.attributes());
        }
        return decl;
    }
}