I want to read bad HTML into Scala as XML. I know TagSoup
(http://home.ccil.org/~cowan/XML/tagsoup/) is up to the job of parsing the HTML. I can't see any way of parameterizing Scala's XML with a replacement SAX parser. Is there any way to do this, or workaround achieving the same result? |
Julian Morrison schrieb:
> I can't see any way of parameterizing Scala's XML with a > replacement SAX parser. You need a TagSoupFactoryAdapter (what a class name...). The attached one works for me. (Is the scopeStack.push/pop necessary in a non namespace-aware setting?) Usage is something like val r = new java.io.StringReader(s) val p = new TagSoupFactoryAdapter val html = p load r Yours, Florian -- Dr. Florian Hars | BIK ASCHPURWIS + BEHRENS GmbH | Geschäftsführer: Kurt Behrens Feldbrunnenstr. 7, 20148 Hamburg | Handelsregister: HAMBURG 66 HR B 40 473 (040) 41 47 87 -21, Fax: -15 | Ust.-ID: DE 118607581 /* Copyright (c) 2008 Florian Hars, BIK Aschpurwis+Behrens GmbH, Hamburg Copyright (c) 2002-2008 EPFL, Lausanne, unless otherwise specified. All rights reserved. This software was developed by the Programming Methods Laboratory of the Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland. Permission to use, copy, modify, and distribute this software in source or binary form for any purpose with or without fee is hereby granted, provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. Neither the name of the EPFL nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ package tagsoup import org.xml.sax.InputSource import javax.xml.parsers.SAXParser import org.ccil.cowan.tagsoup.jaxp.SAXFactoryImpl import scala.xml.parsing.FactoryAdapter import scala.xml._ class TagSoupFactoryAdapter extends FactoryAdapter { val parserFactory = new SAXFactoryImpl parserFactory.setNamespaceAware(false) val emptyElements = Set("area", "base", "br", "col", "hr", "img", "input", "link", "meta", "param") /** Tests if an XML element contains text. * @return true if element named <code>localName</code> contains text. */ def nodeContainsText(localName: String) = !(emptyElements contains localName) /** creates a node. */ def createNode(pre:String, label: String, attrs: MetaData, scpe: NamespaceBinding, children: List[Node] ): Elem = { Elem( pre, label, attrs, scpe, children:_* ); } /** creates a text node */ def createText( text:String ) = Text( text ); /** Ignore Processing Instructions */ def createProcInstr(target: String, data: String) = Nil /** load XML document * @param source * @return a new XML document object */ override def loadXML(source: InputSource) = { val parser: SAXParser = parserFactory.newSAXParser() scopeStack.push(TopScope) parser.parse(source, this) scopeStack.pop rootElem } } |
In reply to this post by Julian Morrison
I recently used Tagsoup in scala but I just wrote a method using Tagsoup's Parser to load the HTML. Is this a reasonable way to do it: def load(url:String): Node = { import org.ccil.cowan.tagsoup.Parser import org.ccil.cowan.tagsoup.XMLWriter import java.io.StringWriter import java.net.URL import org.xml.sax.InputSource val parser = new Parser() val writer = new StringWriter() parser.setContentHandler(new XMLWriter(writer)) parser.parse(new InputSource(new URL(url).openConnection().getInputStream())) XML.loadString(writer.toString()) } |
On Mon, Jun 2, 2008 at 9:05 PM, Channing Walton <[hidden email]> wrote:
If you use Florian's TagSoupFactoryAdapter, parsing happens once which is efficient. In your solution the xml is parsed, then converted to a string, then parsed again. Not very elegant, but works -- I would still prefer the efficient solution. Burak -- Burak Emir -- http://burak.emir.googlepages.com |
yes good point. I will modify my solution to use Florian's. |
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