ext/java/nokogiri/internals/HtmlDomParserContext.java
package nokogiri.internals;
import static nokogiri.internals.NokogiriHelpers.getNokogiriClass;
import static nokogiri.internals.NokogiriHelpers.isNamespace;
import static nokogiri.internals.NokogiriHelpers.stringOrNil;
import nokogiri.Html4Document;
import nokogiri.NokogiriService;
import nokogiri.XmlDocument;
import nokogiri.XmlSyntaxError;
import org.apache.xerces.xni.Augmentations;
import org.apache.xerces.xni.QName;
import org.apache.xerces.xni.XMLAttributes;
import org.apache.xerces.xni.XNIException;
import org.apache.xerces.xni.parser.XMLDocumentFilter;
import org.apache.xerces.xni.parser.XMLParserConfiguration;
import net.sourceforge.htmlunit.cyberneko.HTMLConfiguration;
import net.sourceforge.htmlunit.cyberneko.filters.DefaultFilter;
import org.jruby.Ruby;
import org.jruby.RubyClass;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.Helpers;
import org.jruby.runtime.builtin.IRubyObject;
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
* Parser for Html4Document. This class actually parses Html4Document using NekoHtml.
*
* @author sergio
* @author Patrick Mahoney <pat@polycrystal.org>
* @author Yoko Harada <yokolet@gmail.com>
*/
public class HtmlDomParserContext extends XmlDomParserContext
{
private static final long serialVersionUID = 1L;
public
HtmlDomParserContext(Ruby runtime, IRubyObject options)
{
this(runtime, runtime.getNil(), options);
}
public
HtmlDomParserContext(Ruby runtime, IRubyObject encoding, IRubyObject options)
{
super(runtime, encoding, options);
java_encoding = NokogiriHelpers.getValidEncoding(encoding);
}
@Override
protected void
initParser(Ruby runtime)
{
XMLParserConfiguration config = new HTMLConfiguration();
XMLDocumentFilter elementValidityCheckFilter = new ElementValidityCheckFilter(errorHandler);
XMLDocumentFilter[] filters = { elementValidityCheckFilter};
config.setErrorHandler(this.errorHandler);
parser = new NokogiriDomParser(config);
// see http://nekohtml.sourceforge.net/settings.html for details
setProperty("http://cyberneko.org/html/properties/default-encoding", java_encoding);
setProperty("http://cyberneko.org/html/properties/names/elems", "lower");
setProperty("http://cyberneko.org/html/properties/names/attrs", "lower");
setProperty("http://cyberneko.org/html/properties/filters", filters);
setFeature("http://cyberneko.org/html/features/report-errors", true);
setFeature("http://xml.org/sax/features/namespaces", false);
}
@Override
public void
setEncoding(String encoding)
{
super.setEncoding(encoding);
}
/**
* Enable NekoHTML feature for balancing tags in a document fragment.
*
* This method is used in XmlNode#in_context method.
*/
public void
enableDocumentFragment()
{
setFeature("http://cyberneko.org/html/features/balance-tags/document-fragment", true);
}
@Override
public XmlDocument
parse(ThreadContext context, RubyClass klass, IRubyObject url)
{
XmlDocument xmlDoc = super.parse(context, klass, url);
// let's be consistent in how we handle RECOVER and NORECOVER (a.k.a. STRICT)
// https://github.com/sparklemotion/nokogiri/issues/2130
if (!options.recover && errorHandler.getErrors().size() > 0) {
XmlSyntaxError xmlSyntaxError = XmlSyntaxError.createXMLSyntaxError(context.runtime);
String exceptionMsg = String.format("%s: '%s'",
"Parser without recover option encountered error or warning",
errorHandler.getErrors().get(0));
xmlSyntaxError.setException(new Exception(exceptionMsg));
throw xmlSyntaxError.toThrowable();
}
return xmlDoc;
}
@Override
protected XmlDocument
wrapDocument(ThreadContext context, RubyClass klass, Document document)
{
Html4Document htmlDocument = new Html4Document(context.runtime, klass, document);
htmlDocument.setDocumentNode(context.runtime, document);
Helpers.invoke(context, htmlDocument, "initialize");
if (ruby_encoding.isNil()) {
// ruby_encoding might have detected by Html4Document::EncodingReader
if (detected_encoding != null && !detected_encoding.isNil()) {
ruby_encoding = detected_encoding;
} else {
// no encoding given & no encoding detected, then try to get it
String charset = tryGetCharsetFromHtml5MetaTag(document);
ruby_encoding = stringOrNil(context.runtime, charset);
}
}
htmlDocument.setEncoding(ruby_encoding);
htmlDocument.setParsedEncoding(java_encoding);
return htmlDocument;
}
// NekoHtml doesn't understand HTML5 meta tag format. This fails to detect charset
// from an HTML5 style meta tag. Luckily, the meta tag and charset exists in DOM tree
// so, this method attempts to find the charset.
private static String
tryGetCharsetFromHtml5MetaTag(Document document)
{
if (!"html".equalsIgnoreCase(document.getDocumentElement().getNodeName())) { return null; }
NodeList list = document.getDocumentElement().getChildNodes();
Node item;
for (int i = 0; i < list.getLength(); i++) {
if ("head".equalsIgnoreCase((item = list.item(i)).getNodeName())) {
NodeList headers = item.getChildNodes();
for (int j = 0; j < headers.getLength(); j++) {
if ("meta".equalsIgnoreCase((item = headers.item(j)).getNodeName())) {
NamedNodeMap nodeMap = item.getAttributes();
for (int k = 0; k < nodeMap.getLength(); k++) {
if ("charset".equalsIgnoreCase((item = nodeMap.item(k)).getNodeName())) {
return item.getNodeValue();
}
}
}
}
}
}
return null;
}
public static class ElementValidityCheckFilter extends DefaultFilter
{
private NokogiriErrorHandler errorHandler;
private
ElementValidityCheckFilter(NokogiriErrorHandler errorHandler)
{
this.errorHandler = errorHandler;
}
// element names from xhtml1-strict.dtd
private static String[][] element_names = {
{"a", "abbr", "acronym", "address", "area"},
{"b", "base", "basefont", "bdo", "big", "blockquote", "body", "br", "button"},
{"caption", "cite", "code", "col", "colgroup"},
{"dd", "del", "dfn", "div", "dl", "dt"},
{"em"},
{"fieldset", "font", "form", "frame", "frameset"},
{}, // g
{"h1", "h2", "h3", "h4", "h5", "h6", "head", "hr", "html"},
{"i", "iframe", "img", "input", "ins"},
{}, // j
{"kbd"},
{"label", "legend", "li", "link"},
{"map", "meta"},
{"noframes", "noscript"},
{"object", "ol", "optgroup", "option"},
{"p", "param", "pre"},
{"q"},
{}, // r
{"s", "samp", "script", "select", "small", "span", "strike", "strong", "style", "sub", "sup"},
{"table", "tbody", "td", "textarea", "tfoot", "th", "thead", "title", "tr", "tt"},
{"u", "ul"},
{"var"},
{}, // w
{}, // x
{}, // y
{} // z
};
private static boolean
isValid(final String name)
{
int index = name.charAt(0) - 97;
if (index >= element_names.length) { return false; }
String[] elementNames = element_names[index];
for (int i = 0; i < elementNames.length; i++) {
if (name.equals(elementNames[i])) {
return true;
}
}
return false;
}
@Override
public void
startElement(QName name, XMLAttributes attrs, Augmentations augs) throws XNIException
{
if (!isValid(name.rawname)) {
errorHandler.addError(new Exception("Tag " + name.rawname + " invalid"));
}
super.startElement(name, attrs, augs);
}
}
}