Subject: Re: [xsl] [ANN] Saxon/C - Saxon for the C/C++ and PHP platforms From: "Tony Graham" <tgraham@xxxxxxxxxx> Date: Fri, 29 Nov 2013 09:59:58 -0000 (GMT) |
On Thu, November 28, 2013 8:32 pm, Michael Kay wrote: ... >> So we need to create a libxslt2 bridge now right? > > You mean in terms of bridging the API? We haven't really explored what's > feasible yet in terms of libxslt2 and libxml cooexistence. At the moment > if you've got data in a libxml tree you have to serialize and reparse to > get it into Saxon. I don't know if we'll ever be able to do better than > that; I suspect the overheads of doing it this way are lower than the > overheads of accessing the libXML tree node-by-node from the Java > environment, but we'll find out in due course. The top-level API for libxslt is at http://www.xmlsoft.org/XSLT/html/libxslt-transform.html The top level of the top-level API would be xsltApplyStylesheet [1]: xmlDocPtr xsltApplyStylesheet (xsltStylesheetPtr style, xmlDocPtr doc, const char ** params) xsltApplyStylesheetUser [2]: xmlDocPtr xsltApplyStylesheetUser (xsltStylesheetPtr style, xmlDocPtr doc, const char ** params, const char * output, FILE * profile, xsltRunStylesheet [3]: int xsltRunStylesheet (xsltStylesheetPtr style, xmlDocPtr doc, const char ** params, const char * output, xmlSAXHandlerPtr SAX, xmlOutputBufferPtr IObuf) and xsltRunStylesheetUser [4]: int xsltRunStylesheetUser (xsltStylesheetPtr style, xmlDocPtr doc, const char ** params, const char * output, xmlSAXHandlerPtr SAX, xmlOutputBufferPtr IObuf, FILE * profile, xsltTransformContextPtr userCtxt) A very unscientific search of code.ohloh.net showed these comparative popularities in C code: xsltApplyStylesheet [5]: 397,605 xsltApplyStylsheetUser [6]: 2,248,197 xsltRunStylesheet [7]: 1,113,553 xsltRunStylesheetUser [8]: 2,659,677 The two main ways to get a xsltStylesheetPtr would be xsltParseStylesheetDoc [9] and xsltParseStylesheetFile [10], with comparative popularities: xsltParseStylesheetDoc [11]: 844,622 xsltParseStylesheetFile [12]: 4,330,439 By way of comparison, newXsltCompiler gets 7,274,828 hits in Java code [13]. > From a first glance, the libxslt2 API is very closely coupled with libxml, > which makes it difficult to reproduce directly; in addition, my experience > is that an API designed for XSLT 1.0 doesn't easily scale outwards to > handle XPath 2.0/3.0, XSLT 2.0/3.0, XQuery 3.0, and XSD 1.1, plus > pipelines mixing all of the above. I don't think you could make a Saxon/C stylesheet look like a xsltStylesheetPtr, but it does appear that most xsltStylesheetPtr are made straight from a file or an existing xmlDoc, so I am back to my assertion that you could get a long way by the XSLT processor just producing and consuming xmlDoc even if, as you say, you have to reserialise from and to the xmlDoc to get things to work. Regards, Tony Graham tgraham@xxxxxxxxxx Consultant http://www.mentea.net Mentea 13 Kelly's Bay Beach, Skerries, Co. Dublin, Ireland -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- XML, XSL-FO and XSLT consulting, training and programming Chair, Print and Page Layout Community Group @ W3C [1] http://www.xmlsoft.org/XSLT/html/libxslt-transform.html#xsltApplyStylesheet [2] http://www.xmlsoft.org/XSLT/html/libxslt-transform.html#xsltApplyStylesheetUser [3] http://www.xmlsoft.org/XSLT/html/libxslt-transform.html#xsltRunStylesheet [4] http://www.xmlsoft.org/XSLT/html/libxslt-transform.html#xsltRunStylesheetUser [5] http://code.ohloh.net/search?s=xsltApplyStylesheet&pp=0&fl=C&fe=c&ff=1&mp=1&ml=1&me=1&md=1&filterChecked=true [6] http://code.ohloh.net/search?s=xsltApplyStylesheetUser&pp=0&fl=C&fe=c&ff=1&mp=1&ml=1&me=1&md=1&filterChecked=true [7] http://code.ohloh.net/search?s=xsltRunStylesheet&pp=0&fl=C&fe=c&ff=1&mp=1&ml=1&me=1&md=1&filterChecked=true [8] http://code.ohloh.net/search?s=xsltRunStylesheetUser&pp=0&fl=C&fe=c&ff=1&mp=1&ml=1&me=1&md=1&filterChecked=true [9] http://www.xmlsoft.org/XSLT/html/libxslt-xsltInternals.html#xsltParseStylesheetDoc [10] http://www.xmlsoft.org/XSLT/html/libxslt-xsltInternals.html#xsltParseStylesheetFile [11] http://code.ohloh.net/search?s=xsltParseStylesheetDoc&pp=0&fl=C&fe=c&ff=1&mp=1&ml=1&me=1&md=1&filterChecked=true [12] http://code.ohloh.net/search?s=xsltParseStylesheetFile&pp=0&fl=C&fe=c&ff=1&mp=1&ml=1&me=1&md=1&filterChecked=true [13] http://code.ohloh.net/search?s=newXsltCompiler&pp=0&fl=Java&mp=1&ml=1&me=1&md=1&ff=1&filterChecked=true
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