This is my two recent areas of work combined.
My motivation for building this API was to allow me to identify what
transformation a particular load was occuring for and this patch
enables me to do that. That's why I've combined them... they actually
make sense (to me anyway) together.
It does the following:
- adds a function to create an xslt transformContext from python
- adds a function to apply a stylesheet with a user supplied
transformContext
- adds a python doc loader which calls a registered python function
with a URI, xpathParserContext and transformContext and accepts a
document in return
- adds a function to set the doc loader to a python function
- adds comparison API for transformContext objects
The patch is not complete... but it is usable and I will complete it
by adding these functions:
- a free for transformContext objects
- a getter for the python doc loader function
There are some problems that I could use some help with:
- why is the doc loader context sometimes a stylesheet instead of a
transformContext?
can libxslt/libxslt/documents.c::xsltLoadStyleDocument be changed so
that it creates a transformContext or something?
- when the doc comes back from the python doc loader function do I
have to DECREF it in some way?
- if I uncomment the xmlFreeParserCtxt(pctxt) at the end of the
pythonDocLoaderFuncWrapper I get complaints from libc about double
free-ing:
*** glibc detected *** double free or corruption (fasttop): 0x0819a7f8 ***
Aborted
I can't see why this is really... I've copied the bones of the
function from the libxml2 entity loader solution and it doesn't seem
to have a problem with double free-ing.
- why could I not get a static cmp function to work as with
libxml_compareNodesEqual?
There seems to be some difference between the libxml generator and
the libxslt one?
--
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 -r -u ../pristine/libxslt-1.1.17/python/generator.py ./python/generator.py
--- ../pristine/libxslt-1.1.17/python/generator.py 2004-01-22
17:40:16.000000000 +0000
+++ ./python/generator.py 2006-09-07 00:24:31.000000000 +0100
@@ -564,6 +564,7 @@
classes_ancestor = {
"xpathContext" : "libxml2.xpathContext",
"xpathParserContext" : "libxml2.xpathParserContext",
+ "transformCtxt": "transformCtxtBase",
}
classes_destructors = {
"xpathContext" : "pass"
Only in ./python: generator.py~
diff -r -u ../pristine/libxslt-1.1.17/python/libxsl.py ./python/libxsl.py
--- ../pristine/libxslt-1.1.17/python/libxsl.py 2004-07-11 12:12:33.000000000
+0100
+++ ./python/libxsl.py 2006-09-07 00:46:18.000000000 +0100
@@ -56,6 +56,20 @@
import libxsltmod
import libxml2
+
+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 extensionModule:
def _styleInit(self, style, URI):
return self.styleInit(stylesheet(_obj=style), URI)
Only in ./python: libxsl.py~
Only in ../pristine/libxslt-1.1.17/python: libxslt-py.c
diff -r -u ../pristine/libxslt-1.1.17/python/libxslt-python-api.xml
./python/libxslt-python-api.xml
--- ../pristine/libxslt-1.1.17/python/libxslt-python-api.xml 2006-09-01
03:14:20.000000000 +0100
+++ ./python/libxslt-python-api.xml 2006-09-07 00:33:35.000000000 +0100
@@ -11,6 +11,31 @@
<arg name='style' type='xsltStylesheetPtr' info='a parsed XSLT
stylesheet'/>
<arg name='result' type='xmlDocPtr' info='The result document'/>
</function>
+ <function name='xsltSetLoaderFunc' file='python'>
+ <info>Set the function for controlling document loading</info>
+ <return type='long' info='0 or 1'/>
+ <arg name='loader' type='pythonObject' info='the loader 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='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='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>
<function name='xsltApplyStylesheet' file='python'>
<info>Apply the stylesheet to the document</info>
<return type='xmlDocPtr' info="the result document or NULL in case of
error"/>
Only in ./python: libxslt-python-api.xml~
diff -r -u ../pristine/libxslt-1.1.17/python/libxslt.c ./python/libxslt.c
--- ../pristine/libxslt-1.1.17/python/libxslt.c 2004-07-02 14:49:07.000000000
+0100
+++ ./python/libxslt.c 2006-09-07 00:34:38.000000000 +0100
@@ -20,6 +20,8 @@
#include "libxslt_wrap.h"
#include "libxslt-py.h"
+#include <stdio.h>
+
#if (defined(_MSC_VER) || defined(__MINGW32__)) && !defined(vsnprintf)
#define vsnprintf(b,c,f,a) _vsnprintf(b,c,f,a)
#elif defined(XSLT_NEED_TRIO)
@@ -55,6 +57,9 @@
}
ret = PyCObject_FromVoidPtrAndDesc((void *) style,
(char *)"xsltStylesheetPtr", NULL);
+
+ // Py_AddAttr(ret, cmp_function_impl);
+
return(ret);
}
@@ -90,6 +95,26 @@
return(ret);
}
+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);
+}
+
+
/************************************************************************
* *
* Extending the API *
@@ -423,6 +448,105 @@
return(py_retval);
}
+
+/************************************************************************
+ * *
+ * 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: pctxt, uri, options, ctxt
+ // the ctxt should be the stylesheet allowing us to differentiate between
transformations
+ if (pythonDocLoaderObject != NULL) {
+ xsltStylesheetPtr style;
+ PyObject *ctxtobj;
+ PyObject *pctxtobj;
+ PyObject *result;
+
+ style = (xsltStylesheetPtr) ctxt;
+ ctxtobj = libxslt_xsltStylesheetPtrWrap(ctxt);
+ pctxtobj = libxml_xmlParserCtxtPtrWrap(pctxt);
+
+ // For now just send parserContext and URL
+ result = PyObject_CallFunction(pythonDocLoaderObject,
+ (char *) "(sOO)", URI, pctxtobj,
ctxtobj);
+ 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) {
+ // xmlDocDump(stderr, doc);
+ ;
+ }
+ else {
+ 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);
+}
+
+
+
/************************************************************************
* *
* Some customized front-ends *
@@ -430,6 +554,103 @@
************************************************************************/
PyObject *
+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_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 *
libxslt_xsltApplyStylesheet(PyObject *self ATTRIBUTE_UNUSED, PyObject *args) {
PyObject *py_retval;
xmlDocPtr c_retval;
Only in ./python: libxslt.c~
Only in ./python/tests: loader.py
Only in ./python/tests: loader.py~
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