org.jsoup.parser.Parser Maven / Gradle / Ivy
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pdfHTML is an iText 7 add-on that lets you to parse (X)HTML snippets and the associated CSS and converts
them to PDF.
package org.jsoup.parser;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.nodes.Node;
import java.util.List;
/**
* Parses HTML into a {@link org.jsoup.nodes.Document}. Generally best to use one of the more convenient parse methods
* in {@link org.jsoup.Jsoup}.
*/
public class Parser {
private static final int DEFAULT_MAX_ERRORS = 0; // by default, error tracking is disabled.
private TreeBuilder treeBuilder;
private int maxErrors = DEFAULT_MAX_ERRORS;
private ParseErrorList errors;
/**
* Create a new Parser, using the specified TreeBuilder
* @param treeBuilder TreeBuilder to use to parse input into Documents.
*/
public Parser(TreeBuilder treeBuilder) {
this.treeBuilder = treeBuilder;
}
public Document parseInput(String html, String baseUri) {
errors = isTrackErrors() ? ParseErrorList.tracking(maxErrors) : ParseErrorList.noTracking();
return treeBuilder.parse(html, baseUri, errors);
}
// gets & sets
/**
* Get the TreeBuilder currently in use.
* @return current TreeBuilder.
*/
public TreeBuilder getTreeBuilder() {
return treeBuilder;
}
/**
* Update the TreeBuilder used when parsing content.
* @param treeBuilder current TreeBuilder
* @return this, for chaining
*/
public Parser setTreeBuilder(TreeBuilder treeBuilder) {
this.treeBuilder = treeBuilder;
return this;
}
/**
* Check if parse error tracking is enabled.
* @return current track error state.
*/
public boolean isTrackErrors() {
return maxErrors > 0;
}
/**
* Enable or disable parse error tracking for the next parse.
* @param maxErrors the maximum number of errors to track. Set to 0 to disable.
* @return this, for chaining
*/
public Parser setTrackErrors(int maxErrors) {
this.maxErrors = maxErrors;
return this;
}
/**
* Retrieve the parse errors, if any, from the last parse.
* @return list of parse errors, up to the size of the maximum errors tracked.
*/
public List getErrors() {
return errors;
}
// static parse functions below
/**
* Parse HTML into a Document.
*
* @param html HTML to parse
* @param baseUri base URI of document (i.e. original fetch location), for resolving relative URLs.
*
* @return parsed Document
*/
public static Document parse(String html, String baseUri) {
TreeBuilder treeBuilder = new HtmlTreeBuilder();
return treeBuilder.parse(html, baseUri, ParseErrorList.noTracking());
}
/**
* Parse a fragment of HTML into a list of nodes. The context element, if supplied, supplies parsing context.
*
* @param fragmentHtml the fragment of HTML to parse
* @param context (optional) the element that this HTML fragment is being parsed for (i.e. for inner HTML). This
* provides stack context (for implicit element creation).
* @param baseUri base URI of document (i.e. original fetch location), for resolving relative URLs.
*
* @return list of nodes parsed from the input HTML. Note that the context element, if supplied, is not modified.
*/
public static List parseFragment(String fragmentHtml, Element context, String baseUri) {
HtmlTreeBuilder treeBuilder = new HtmlTreeBuilder();
return treeBuilder.parseFragment(fragmentHtml, context, baseUri, ParseErrorList.noTracking());
}
/**
* Parse a fragment of XML into a list of nodes.
*
* @param fragmentXml the fragment of XML to parse
* @param baseUri base URI of document (i.e. original fetch location), for resolving relative URLs.
* @return list of nodes parsed from the input XML.
*/
public static List parseXmlFragment(String fragmentXml, String baseUri) {
XmlTreeBuilder treeBuilder = new XmlTreeBuilder();
return treeBuilder.parseFragment(fragmentXml, baseUri, ParseErrorList.noTracking());
}
/**
* Parse a fragment of HTML into the {@code body} of a Document.
*
* @param bodyHtml fragment of HTML
* @param baseUri base URI of document (i.e. original fetch location), for resolving relative URLs.
*
* @return Document, with empty head, and HTML parsed into body
*/
public static Document parseBodyFragment(String bodyHtml, String baseUri) {
Document doc = Document.createShell(baseUri);
Element body = doc.body();
List nodeList = parseFragment(bodyHtml, body, baseUri);
Node[] nodes = nodeList.toArray(new Node[nodeList.size()]); // the node list gets modified when re-parented
for (int i = nodes.length - 1; i > 0; i--) {
nodes[i].remove();
}
for (Node node : nodes) {
body.appendChild(node);
}
return doc;
}
/**
* Utility method to unescape HTML entities from a string
* @param string HTML escaped string
* @param inAttribute if the string is to be escaped in strict mode (as attributes are)
* @return an unescaped string
*/
public static String unescapeEntities(String string, boolean inAttribute) {
Tokeniser tokeniser = new Tokeniser(new CharacterReader(string), ParseErrorList.noTracking());
return tokeniser.unescapeEntities(inAttribute);
}
/**
* @param bodyHtml HTML to parse
* @param baseUri baseUri base URI of document (i.e. original fetch location), for resolving relative URLs.
*
* @return parsed Document
* @deprecated Use {@link #parseBodyFragment} or {@link #parseFragment} instead.
*/
public static Document parseBodyFragmentRelaxed(String bodyHtml, String baseUri) {
return parse(bodyHtml, baseUri);
}
// builders
/**
* Create a new HTML parser. This parser treats input as HTML5, and enforces the creation of a normalised document,
* based on a knowledge of the semantics of the incoming tags.
* @return a new HTML parser.
*/
public static Parser htmlParser() {
return new Parser(new HtmlTreeBuilder());
}
/**
* Create a new XML parser. This parser assumes no knowledge of the incoming tags and does not treat it as HTML,
* rather creates a simple tree directly from the input.
* @return a new simple XML parser.
*/
public static Parser xmlParser() {
return new Parser(new XmlTreeBuilder());
}
}