content: /*
   * Copyright (C) 2015 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package androidx.test.espresso.web.assertion;
  
  import static androidx.test.internal.util.Checks.checkNotNull;
  
  import java.io.IOException;
  import java.io.StringBufferInputStream;
  import javax.xml.transform.TransformerException;
  import javax.xml.transform.TransformerFactory;
  import javax.xml.transform.dom.DOMResult;
  import javax.xml.transform.sax.SAXSource;
  import org.ccil.cowan.tagsoup.Parser;
  import org.w3c.dom.Document;
  import org.xml.sax.InputSource;
  import org.xml.sax.SAXException;
  import org.xml.sax.SAXNotRecognizedException;
  import org.xml.sax.SAXNotSupportedException;
  
  /** Uses TagSoup to parse html into Documents. */
  // Note: preferring this minimalistic approach to a full implementation of
  // javax.xml.parsers.DocumentBuilder.java because we don't need document building capabilities and
  // other parsing features.
  public final class TagSoupDocumentParser {
    private static final ThreadLocal<TransformerFactory> transformerFactory =
        new ThreadLocal<TransformerFactory>() {
          @Override
          protected TransformerFactory initialValue() {
            return TransformerFactory.newInstance();
          }
        };
  
    private final Parser parser;
  
    private TagSoupDocumentParser() throws SAXNotRecognizedException, SAXNotSupportedException {
      parser = new Parser();
      // We do xpath evaluations which are not namespace aware. So make the parser
      // not use any namespaces.
      parser.setFeature(Parser.namespacesFeature, false);
    }
  
    // VisibleForTesting
    public static TagSoupDocumentParser newInstance()
        throws SAXNotRecognizedException, SAXNotSupportedException {
      return new TagSoupDocumentParser();
    }
  
    /** Parses the given html into an {@link Document}. */
    // VisibleForTesting
    public Document parse(String html) throws SAXException, IOException {
      checkNotNull(html);
      SAXSource in = new SAXSource(parser, new InputSource(new StringBufferInputStream(html)));
      DOMResult out = new DOMResult();
      try {
        transformerFactory.get().newTransformer().transform(in, out);
      } catch (TransformerException e) {
        throw new SAXException(e);
      }
      return (Document) out.getNode();
    }
  }
  