mò  ö"Ec@s™dkZeideiƒZeidƒZdfd„ƒYZedjoBeƒZeie dƒi ƒƒe ddƒi ei ƒƒnd Z dS( Ns (\S+)\s*(.*)sb\s*([a-zA-Z_][-:.a-zA-Z_0-9]*)(\s*=\s*(\'[^\']*\'|"[^"]*"|[-a-zA-Z0-9./,:;+*%?!&$\(\)_#=~\'"@]*))?tScrapercBsttZd„Zd„Zd„Zd„Zd„Zd„Zd„Zd„Z d „Z d „Z d „Z d „Z RS( NcCsd|_d|_dS(sInitialise a parser.tN(tselftbuffertoutfile(R((tI/home2/fuzzyman/webapps/www.voidspace.org.uk/cgi-bin/voidspace/scraper.pyt__init__"s cCsd|_d|_dS(s:This method clears the input buffer and the output buffer.RN(RRR(R((Rtreset's cCs|i}d|_|S(sHThis returns all currently processed data and empties the output buffer.RN(RRtdata(RR((Rtpush,s  cCs |iƒ|i}d|_|S(s„Returns all processed data and any unprocessed data (without processing it) and resets the parser. Should be used after all the data has been handled using feed and then collected with push. This returns any trailing data that can't be processed. If you are processing everything in one go using feed, you can safely use this method to return everything. RN(RR RR(RR((Rtclose2s cCs8d|_d|_|i||_g}g}x·|it|iƒdjo™|id7_|i|i}|djo\|i |i di |ƒƒƒg}|i ƒ}|o|i |ƒn|ioPqãq1|i |ƒq1W|io|i|i|_ndi |ƒ|_|idi |ƒ|_dS(s}Pass more data into the parser. As much as possible is processed - but nothing is returned from this method. iÿÿÿÿiitiR Nit!t?it/s'iÿÿÿÿt"(#RRtfindR ttest1ttest2R Rtminttesttmodtstriptthetagt startswithtpdecltppitendtagtnamefindtmatchtnttemptytagtgrouptnamet attributestattrfindtfindallt matchlisttattrstentrytattrnametrestt attrvalueRtlowert handletag(RRR3RR.R2R7R5R$R4R!R/R6R+R"((RRWsV        !  LcCs|S(s¬Called when we encounter a new tag. All the unprocessed data since the last tag is passed to this method. Dummy method to override. Just returns the data unchanged.N(tinchunk(RR:((RR–scCsdS(s®Called when we encounter the *start* of a declaration or comment. '. (Unfortunately common) In this case the tag will be automatically closed at the next '<' - so some data could be incorrectly put inside the tag. A specific example of a subclass of Scraper is also included. This is the approxScraper class. It is used by approx.py a CGI proxy. It overrides several (but not all) of the processing methods of Scraper - and is used to modify URLs in tags so that they go through the proxy. The useful methods of a Scraper instance are : feed(data) - Pass more data into the parser. As much as possible is processed - but nothing is returned from this method. push() - This returns all currently processed data and empties the output buffer. close() - Returns aall processed data and unprocessed data (without processing it) and resets the parser. Should be used after all the data has been handled using feed and then collected with push. This returns any trailing data that can't be processed. reset() - This method clears the input buffer and the output buffer. The following methods are the methods called to handle various parts of an HTML document. In a normal Scraper instance they do nothing and are intended to be overridden. Some of them rely on the self.index attribute property of the instance which tells it where in self.buffer we have got to. Some of them are explicitly passed the tag they are working on - in which case, self.index will be set to the end of the tag. After all these methods have returned self.index will be incremented to the next character. If your methods do any future processing they can manually modify self.index All these methods should return anything to include in the processed document. pdata(inchunk) Called when we encounter a new tag. All the unprocessed data since the last tag is passed to this method. Dummy method to override. Just returns the data unchanged. pdecl() Called when we encounter the *start* of a declaration or comment. '.. theoretically it could close them in the wrog place I suppose.... (This is very bad HTML anyway - but I need to watch for missing content that gets caught like this.) Could check for character entities and named entities in HTML like HTMLParser. Doesn't do anything special for self closing tags (e.g.
) Apparently *this* is valid "tag='->'" which confuses us. CHANGELOG 06-09-04 Version 1.3.0 A couple of patches by Paul Perkins - mainly prevents the namefind regular expression grabbing a characters when it has no attributes. 29-07-04 Version 1.2.1 Was losing a bit of data with each new feed. Have sorted it now. Couple of fixes in approxScraper - added a couple of tags and sorted out a problem with URLs with ':' in the query string. 24-07-04 Version 1.2.0 Refactored into Scraper and approxScraper classes. Is now a general purpose, basic, HTML parser. 19-07-04 Version 1.1.0 Modified to output URLs using the PATH_INFO method - see approx.py Cleaned up tag handling - it now works properly when there is a missing closing tag (common - but see TODO - has to guess where to close it). 11-07-04 Version 1.0.1 Added the close method. 09-07-04 Version 1.0.0 First version designed to work with approx.py the CGI proxy. (tretcompiletDOTALLR)R0RR;taRtopentreadtwriteR t__doc__(RBR0RR?R)RF((RRs Ÿ