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[xml] python wrapper for the document loading API: patch
- From: Nic James Ferrier <nferrier tapsellferrier co uk>
- To: libxml <xml gnome org>
- Subject: [xml] python wrapper for the document loading API: patch
- Date: Fri, 08 Sep 2006 22:02:00 +0100
Here is my patch for the python wrapper for the document loading API.
It now works and is complete in all but one respect. I don't seem to
be able to get the xsltGetLoaderFunc function to appear in the python
API. I think this is because the return value of the function _must_
be a pythonObject and I think there might be something wrong with the
generator in that case.
Anyway... getLoaderFunc() isn't all that necessary and I can fix it
down the line so I think this patch could be considered for inclusion.
Here's a changelog for this patch:
2006-09-08 Nic James Ferrier <nferrier tapsellferrier co uk>
* python/tests/loader.py: new test of loader API wrapper
* python/tests/2stage.py: new test of stylesheet creation, then parsing
* python/libxslt.c: new functions libxslt_xsltNewTransformContext,
libxslt_xsltFreeTransformContext, libxslt_xsltApplyStylesheetUser
* python/libxslt.c: new functions pythonDocLoaderFuncWrapper,
libxslt_xsltSetLoaderFunc, libxslt_xsltGetLoaderFunc
* python/libxslt.c: new static variable pythonDocLoaderObject
* python/libxslt.c: new functions
libxslt_xsltCompareStylesheetsEqual, libxslt_xsltCompareTransformContextsEqual
* python/libxslt-python-api.xml: add declarations for
xsltSetLoaderFunc, xsltGetLoaderFunc, xsltNewTranformContext,
xsltCompareTransformContextsEqual, xsltCompareStylesheetsEqual,
xsltApplyStylesheetUser
* python/libxsl.py: new classes transformCtxtBase, stylesheetBase
* python/generator.py: add base classes for transformCtxt,
stylesheet
Daniel, would you consider including this please?
--
Nic Ferrier
http://www.tapsellferrier.co.uk for all your tapsell ferrier needs
Only in ../pristine/libxslt-1.1.17/libexslt: exsltconfig.h
Only in ../pristine/libxslt-1.1.17/libxslt: xsltconfig.h
Only in ../pristine/libxslt-1.1.17/libxslt: xsltwin32config.h
Only in ../pristine/libxslt-1.1.17: libxslt.spec
diff -x '*~' --unidirectional-new-file -r ../pristine/libxslt-1.1.17/python/generator.py ./python/generator.py
566a567,568
> "transformCtxt": "transformCtxtBase",
> "stylesheet": "stylesheetBase",
diff -x '*~' --unidirectional-new-file -r ../pristine/libxslt-1.1.17/python/libxsl.py ./python/libxsl.py
58a59,83
>
> class transformCtxtBase:
> def __init__(self, _obj=None):
> if _obj != None:
> self._o = _obj;
> return
> self._o = None
> def __eq__(self, other):
> if self == None or other == None:
> return 0
> v = libxsltmod.xsltCompareTransformContextsEqual(self._o, other._o)
> return v
>
> class stylesheetBase:
> def __init__(self, _obj=None):
> if _obj != None:
> self._o = _obj;
> return
> self._o = None
> def __eq__(self, other):
> if self == None or other == None:
> return 0
> v = libxsltmod.xsltCompareStylesheetsEqual(self._o, other._o)
> return v
>
Only in ../pristine/libxslt-1.1.17/python: libxslt-py.c
diff -x '*~' --unidirectional-new-file -r ../pristine/libxslt-1.1.17/python/libxslt-python-api.xml ./python/libxslt-python-api.xml
13a14,53
> <function name='xsltSetLoaderFunc' file='python'>
> <info>Set the function for controlling document loading</info>
> <return type='long' info='0 for failure or 1 for success'/>
> <arg name='loader' type='pythonObject' info='the loader function; should take: string URI, xsltParserContext, context, type; when type == 1 the context is a stylesheet, when type == 0 the context is a transformCtxt'/>
> </function>
> <function name='xsltGetLoaderFunc' file='python'>
> <info>Get the function for controlling document loading</info>
> <return type='pythonObject *' info='the function'/>
> </function>
> <function name='xsltNewTransformContext' file='python'>
> <info>Create a new XSLT TransformContext</info>
> <return type='xsltTransformContextPtr' info='an xslt TransformContext'/>
> <arg name='style' type='xsltStylesheetPtr' info='a parsed XSLT stylesheet'/>
> <arg name='doc' type='xmlDocPtr' info='the input document'/>
> </function>
> <function name='xsltFreeTransformContext' file='python'>
> <info>Free up an existing XSLT TransformContext</info>
> <return type='void' info='None'/>
> <arg name='transformCtxt' type='xsltTransformContextPtr' info='an existing tranformCtxt'/>
> </function>
> <function name='xsltCompareTransformContextsEqual' file='python'>
> <info>Compare one transformCtxt with another</info>
> <return type='int' info='1 in case of success, 0 or -1 in error' />
> <arg name='transformCtxt' type='xsltTransformContextPtr' info='a parsed XSLT transformContext'/>
> <arg name='other' type='xsltTransformContextPtr' info='a parsed XSLT transformContext'/>
> </function>
> <function name='xsltCompareStylesheetsEqual' file='python'>
> <info>Compare one stylesheet with another</info>
> <return type='int' info='1 in case of success, 0 or -1 in error' />
> <arg name='stylesheet' type='xsltStylesheetPtr' info='a parsed XSLT stylesheet'/>
> <arg name='other' type='xsltStylesheetPtr' info='a parsed XSLT stylesheet'/>
> </function>
> <function name='xsltApplyStylesheetUser' file='python'>
> <info>Apply the stylesheet to the document</info>
> <return type='xmlDocPtr' info="the result document or NULL in case of error"/>
> <arg name='style' type='xsltStylesheetPtr' info='a parsed XSLT stylesheet'/>
> <arg name='doc' type='xmlDocPtr' info='a parsed XML document'/>
> <arg name='params' type='pythonObject' info='the parameters dictionnary'/>
> <arg name='transformCtxt' type='xsltTransformContextPtr' info='transformation context'/>
> </function>
diff -x '*~' --unidirectional-new-file -r ../pristine/libxslt-1.1.17/python/libxslt.c ./python/libxslt.c
22a23,24
> #include <stdio.h>
>
57a60,62
>
> // Py_AddAttr(ret, cmp_function_impl);
>
92a98,135
> PyObject *
> libxslt_xsltCompareTransformContextsEqual(PyObject *self ATTRIBUTE_UNUSED, PyObject *args) {
>
> PyObject *py_tctxt1, *py_tctxt2;
> xsltTransformContextPtr tctxt1, tctxt2;
>
> if (!PyArg_ParseTuple(args, (char *)"OO:compareTransformContextsEqual",
> &py_tctxt1, &py_tctxt2))
> return NULL;
>
> tctxt1 = (xsltTransformContextPtr) PytransformCtxt_Get(py_tctxt1);
> tctxt2 = (xsltTransformContextPtr) PytransformCtxt_Get(py_tctxt2);
>
> if ( tctxt1 == tctxt2 )
> return Py_BuildValue((char *)"i", 1);
> else
> return Py_BuildValue((char *)"i", 0);
> }
>
> PyObject *
> libxslt_xsltCompareStylesheetsEqual(PyObject *self ATTRIBUTE_UNUSED, PyObject *args) {
>
> PyObject *py_style1, *py_style2;
> xsltStylesheetPtr style1, style2;
>
> if (!PyArg_ParseTuple(args, (char *)"OO:compareStylesheetsEqual",
> &py_style1, &py_style2))
> return NULL;
>
> style1 = (xsltStylesheetPtr) Pystylesheet_Get(py_style1);
> style2 = (xsltStylesheetPtr) Pystylesheet_Get(py_style2);
>
> if ( style1 == style2 )
> return Py_BuildValue((char *)"i", 1);
> else
> return Py_BuildValue((char *)"i", 0);
> }
>
425a469,571
>
> /************************************************************************
> * *
> * Document loading front-ends *
> * *
> ************************************************************************/
>
> static PyObject *pythonDocLoaderObject = NULL;
>
> static xmlDocPtr
> pythonDocLoaderFuncWrapper(const xmlChar * URI, xmlDictPtr dict, int options,
> void *ctxt ATTRIBUTE_UNUSED,
> xsltLoadType type ATTRIBUTE_UNUSED)
> {
> xmlParserCtxtPtr pctxt;
> xmlDocPtr doc;
>
> pctxt = xmlNewParserCtxt();
> if (pctxt == NULL)
> return(NULL);
> if ((dict != NULL) && (pctxt->dict != NULL)) {
> xmlDictFree(pctxt->dict);
> pctxt->dict = NULL;
> }
> if (dict != NULL) {
> pctxt->dict = dict;
> xmlDictReference(pctxt->dict);
> #ifdef WITH_XSLT_DEBUG
> xsltGenericDebug(xsltGenericDebugContext,
> "Reusing dictionary for document\n");
> #endif
> }
> xmlCtxtUseOptions(pctxt, options);
>
> // Now pass to python the URI, the xsltParserContext and the context
> // (either a transformContext or a stylesheet) and get back an xmlDocPtr
> if (pythonDocLoaderObject != NULL) {
> PyObject *ctxtobj, *pctxtobj, *result;
> pctxtobj = libxml_xmlParserCtxtPtrWrap(pctxt);
>
> if (type == XSLT_LOAD_DOCUMENT) {
> ctxtobj = libxslt_xsltTransformContextPtrWrap(ctxt);
> result = PyObject_CallFunction(pythonDocLoaderObject,
> (char *) "(sOOi)", URI, pctxtobj, ctxtobj, 0);
> }
> else {
> ctxtobj = libxslt_xsltStylesheetPtrWrap(ctxt);
> result = PyObject_CallFunction(pythonDocLoaderObject,
> (char *) "(sOOi)", URI, pctxtobj, ctxtobj, 1);
> }
>
> Py_XDECREF(pctxtobj);
>
> if (result != NULL) {
> // The return value should be the document
> // Should we test it somehow before getting the C object from it?
> PyObject *py_doc = PyObject_GetAttrString(result, "_o");
> doc = PyxmlNode_Get(py_doc);
> // do we have to DECCREF the result??
> }
> }
>
> if (! pctxt->wellFormed) {
> if (doc != NULL) {
> xmlFreeDoc(doc);
> }
> if (pctxt->myDoc != NULL) {
> doc = NULL;
> xmlFreeDoc(pctxt->myDoc);
> pctxt->myDoc = NULL;
> }
> }
> // xmlFreeParserCtxt(pctxt); // libc complains about double free-ing with this line
>
> return(doc);
> }
>
>
> PyObject *
> libxslt_xsltSetLoaderFunc(PyObject *self ATTRIBUTE_UNUSED, PyObject *args) {
> PyObject *py_retval;
> PyObject *loader;
>
> if (!PyArg_ParseTuple(args, (char *)"O:libxslt_xsltSetLoaderFunc",
> &loader))
> return(NULL);
>
> pythonDocLoaderObject = loader;
> xsltSetLoaderFunc(pythonDocLoaderFuncWrapper);
>
> py_retval = PyInt_FromLong(0);
> return(py_retval);
> }
>
> PyObject *
> libxslt_xsltGetLoaderFunc(void) {
> PyObject *py_retval;
>
> py_retval = pythonDocLoaderObject;
> return(py_retval);
> }
>
>
432a579,691
> libxslt_xsltNewTransformContext(PyObject *self ATTRIBUTE_UNUSED, PyObject *args) {
> PyObject *py_retval;
> PyObject *pyobj_style;
> PyObject *pyobj_doc;
> xsltStylesheetPtr style;
> xmlDocPtr doc;
> xsltTransformContextPtr c_retval;
>
> if (!PyArg_ParseTuple(args, (char *) "OO:xsltNewTransformContext",
> &pyobj_style, &pyobj_doc))
> return(NULL);
>
> style = (xsltStylesheetPtr) Pystylesheet_Get(pyobj_style);
> doc = (xmlDocPtr) PyxmlNode_Get(pyobj_doc);
>
> c_retval = xsltNewTransformContext(style, doc);
> py_retval = libxslt_xsltTransformContextPtrWrap((xsltTransformContextPtr) c_retval);
> return (py_retval);
> }
>
> PyObject *
> libxslt_xsltFreeTransformContext(PyObject *self ATTRIBUTE_UNUSED, PyObject *args) {
> PyObject *py_tctxt;
> xsltTransformContextPtr tctxt;
>
> if (!PyArg_ParseTuple(args, (char *) "O:xsltFreeTransformContext", &py_tctxt))
> return(NULL);
>
> tctxt = (xsltTransformContextPtr) PytransformCtxt_Get(py_tctxt);
> xsltFreeTransformContext(tctxt);
>
> // Return None
> Py_INCREF(Py_None);
> return(Py_None);
> }
>
> PyObject *
> libxslt_xsltApplyStylesheetUser(PyObject *self ATTRIBUTE_UNUSED, PyObject *args) {
> PyObject *py_retval;
> xmlDocPtr c_retval;
> xsltStylesheetPtr style;
> PyObject *pyobj_style;
> xmlDocPtr doc;
> xsltTransformContextPtr transformCtxt;
> PyObject *pyobj_doc;
> PyObject *pyobj_params;
> PyObject *pyobj_transformCtxt;
> const char **params = NULL;
> int len = 0, i = 0, j;
> PyObject *name;
> PyObject *value;
>
> if (!PyArg_ParseTuple(args, (char *) "OOOO:xsltApplyStylesheetUser",
> &pyobj_style, &pyobj_doc, &pyobj_params, &pyobj_transformCtxt))
> return(NULL);
>
> if (pyobj_params != Py_None) {
> if (PyDict_Check(pyobj_params)) {
> len = PyDict_Size(pyobj_params);
> if (len > 0) {
> params = (const char **) xmlMalloc((len + 1) * 2 *
> sizeof(char *));
> if (params == NULL) {
> printf("libxslt_xsltApplyStylesheet: out of memory\n");
> Py_INCREF(Py_None);
> return(Py_None);
> }
> j = 0;
> while (PyDict_Next(pyobj_params, &i, &name, &value)) {
> const char *tmp;
> int size;
>
> tmp = PyString_AS_STRING(name);
> size = PyString_GET_SIZE(name);
> params[j * 2] = (char *) xmlCharStrndup(tmp, size);
> if (PyString_Check(value)) {
> tmp = PyString_AS_STRING(value);
> size = PyString_GET_SIZE(value);
> params[(j * 2) + 1] = (char *)
> xmlCharStrndup(tmp, size);
> } else {
> params[(j * 2) + 1] = NULL;
> }
> j = j + 1;
> }
> params[j * 2] = NULL;
> params[(j * 2) + 1] = NULL;
> }
> } else {
> printf("libxslt_xsltApplyStylesheet: parameters not a dict\n");
> Py_INCREF(Py_None);
> return(Py_None);
> }
> }
> style = (xsltStylesheetPtr) Pystylesheet_Get(pyobj_style);
> doc = (xmlDocPtr) PyxmlNode_Get(pyobj_doc);
> transformCtxt = (xsltTransformContextPtr) PytransformCtxt_Get(pyobj_transformCtxt);
>
> c_retval = xsltApplyStylesheetUser(style, doc, params, NULL, NULL, transformCtxt);
> py_retval = libxml_xmlDocPtrWrap((xmlDocPtr) c_retval);
> if (params != NULL) {
> if (len > 0) {
> for (i = 0;i < 2 * len;i++) {
> if (params[i] != NULL)
> xmlFree((char *)params[i]);
> }
> xmlFree(params);
> }
> }
> return(py_retval);
> }
>
> PyObject *
diff -x '*~' --unidirectional-new-file -r ../pristine/libxslt-1.1.17/python/tests/2stage.py ./python/tests/2stage.py
0a1,22
> #!/usr/bin/python
>
> import libxslt
> import libxml2
> import sys
>
> styledoc = libxml2.parseDoc("""
> <xsl:stylesheet version='1.0'
> xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
> <xsl:template match='/'>
> <x><xsl:value-of select='*'/></x>
> </xsl:template>
> </xsl:stylesheet>
> """)
> style = libxslt.newStylesheet()
> style.parseStylesheetProcess(styledoc)
>
> testdoc = libxml2.parseDoc("<a>hello!</a>")
> result = style.applyStylesheet(testdoc, {})
> result.dump(sys.stdout)
>
> # End
diff -x '*~' --unidirectional-new-file -r ../pristine/libxslt-1.1.17/python/tests/loader.py ./python/tests/loader.py
0a1,94
> import libxslt
> import libxml2
> import sys
> import pdb
>
>
> savedTC1 = None
> savedTC2 = None
> savedStyle1 = None
> savedStyle2 = None
>
> def fn(url, pctx, ctx, type):
> global savedTC1
> global savedTC2
> global savedStyle1
> global savedStyle2
>
> try:
> if type == 0:
> tc = libxslt.transformCtxt(_obj=ctx)
>
> if savedTC1 == tc:
> print "matched TC1!"
>
> if savedTC2 == tc:
> print "matched TC2!"
>
> pctxt = libxml2.parserCtxt(_obj=pctx)
> doc = pctxt.ctxtReadDoc("""<?xml version='1.0'?><b>Goodbye</b>""", url, "UTF-8", 2)
> return doc
>
> else:
> style = libxslt.stylesheet(_obj=ctx)
>
> if savedStyle1 == style:
> print "matched savedStyle1!"
>
> if savedStyle2 == style:
> print "matched savedStyle2!"
>
> pctxt = libxml2.parserCtxt(_obj=pctx)
> doc = pctxt.ctxtReadDoc("""
> <xsl:stylesheet version='1.0'
> xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
> </xsl:stylesheet>""", url, "UTF-8", 2)
> return doc
>
> except Exception, e:
> print >>sys.stderr, "something went wrong: ", e
> return None
>
> def run():
> libxslt.setLoaderFunc(fn)
> styledoc = libxml2.parseDoc("""
> <xsl:stylesheet version='1.0'
> xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
> <xsl:import href='import1.xslt'/>
> <xsl:template match='/'>
> <x><xsl:value-of select='document("b.xml")'/></x>
> </xsl:template>
> </xsl:stylesheet>
> """)
> style = libxslt.newStylesheet()
> if style:
> global savedStyle1
> global savedTC1
> global savedTC2
> savedStyle1 = style
>
> style.parseStylesheetProcess(styledoc)
>
> src_doc1 = libxml2.parseDoc("<a/>")
> transform_ctxt1 = style.newTransformContext(src_doc1)
> savedTC1 = transform_ctxt1
>
> src_doc2 = libxml2.parseDoc("<c/>")
> transform_ctxt2 = style.newTransformContext(src_doc2)
> savedTC2 = transform_ctxt2
>
> result = style.applyStylesheetUser(src_doc1, {}, transform_ctxt1)
> result.dump(sys.stdout)
>
> style.freeStylesheet()
> src_doc1.freeDoc()
> src_doc2.freeDoc()
>
> transform_ctxt1.freeTransformContext()
> transform_ctxt2.freeTransformContext()
>
> #print libxslt.getLoaderFunc()
>
> run()
>
> # End
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