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libxslt/python/libxslt.c
Daniel Veillard b827b9b065 fixes for compiling without config.h Daniel 
* python/generator.py python/libxslt.c: fixes for compiling
  without config.h
Daniel
2002-11-23 11:25:00 +00:00

468 lines
12 KiB
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/*
* libxslt.c: this modules implements the main part of the glue of the
* libxslt library and the Python interpreter. It provides the
* entry points where an automatically generated stub is either
* unpractical or would not match cleanly the Python model.
*
* If compiled with MERGED_MODULES, the entry point will be used to
* initialize both the libxml2 and the libxslt wrappers
*
* See Copyright for the status of this software.
*
* daniel@veillard.com
*/
#include <Python.h>
/* #include "config.h" */
#include <libxml/xmlmemory.h>
#include <libxml/tree.h>
#include <libxml/xpath.h>
#include "libxslt_wrap.h"
#include "libxslt-py.h"
/* #define DEBUG */
/* #define DEBUG_XPATH */
/* #define DEBUG_ERROR */
/* #define DEBUG_MEMORY */
void initlibxsltmod(void);
/************************************************************************
* *
* Per type specific glue *
* *
************************************************************************/
PyObject *
libxslt_xsltStylesheetPtrWrap(xsltStylesheetPtr style) {
PyObject *ret;
#ifdef DEBUG
printf("libxslt_xsltStylesheetPtrWrap: style = %p\n", style);
#endif
if (style == NULL) {
Py_INCREF(Py_None);
return(Py_None);
}
ret = PyCObject_FromVoidPtrAndDesc((void *) style,
(char *)"xsltStylesheetPtr", NULL);
return(ret);
}
PyObject *
libxslt_xsltTransformContextPtrWrap(xsltTransformContextPtr ctxt) {
PyObject *ret;
#ifdef DEBUG
printf("libxslt_xsltTransformContextPtrWrap: ctxt = %p\n", ctxt);
#endif
if (ctxt == NULL) {
Py_INCREF(Py_None);
return(Py_None);
}
ret = PyCObject_FromVoidPtrAndDesc((void *) ctxt,
(char *)"xsltTransformContextPtr", NULL);
return(ret);
}
/************************************************************************
* *
* Extending the API *
* *
************************************************************************/
static xmlHashTablePtr libxslt_extModuleFunctions = NULL;
static void
libxslt_xmlXPathFuncCallback(xmlXPathParserContextPtr ctxt, int nargs) {
PyObject *list, *cur, *result;
xmlXPathObjectPtr obj;
xmlXPathContextPtr rctxt;
PyObject *current_function = NULL;
const xmlChar *name;
const xmlChar *ns_uri;
int i;
if (ctxt == NULL)
return;
rctxt = ctxt->context;
if (rctxt == NULL)
return;
name = rctxt->function;
ns_uri = rctxt->functionURI;
#ifdef DEBUG_XPATH
printf("libxslt_xmlXPathFuncCallback called name %s URI %s\n", name, ns_uri);
#endif
/*
* Find the function, it should be there it was there at lookup
*/
current_function = xmlHashLookup2(libxslt_extModuleFunctions,
name, ns_uri);
if (current_function == NULL) {
printf("libxslt_xmlXPathFuncCallback: internal error %s not found !\n",
name);
return;
}
list = PyTuple_New(nargs + 1);
PyTuple_SetItem(list, 0, libxml_xmlXPathParserContextPtrWrap(ctxt));
for (i = nargs - 1;i >= 0;i--) {
obj = valuePop(ctxt);
cur = libxml_xmlXPathObjectPtrWrap(obj);
PyTuple_SetItem(list, i + 1, cur);
}
result = PyEval_CallObject(current_function, list);
Py_DECREF(list);
obj = libxml_xmlXPathObjectPtrConvert(result);
valuePush(ctxt, obj);
}
PyObject *
libxslt_xsltRegisterExtModuleFunction(PyObject *self ATTRIBUTE_UNUSED,
PyObject *args) {
PyObject *py_retval;
int ret = 0;
xmlChar *name;
xmlChar *ns_uri;
PyObject *pyobj_f;
if (!PyArg_ParseTuple(args, (char *)"szO:registerXPathFunction",
&name, &ns_uri, &pyobj_f))
return(NULL);
if ((name == NULL) || (pyobj_f == NULL)) {
py_retval = libxml_intWrap(-1);
return(py_retval);
}
#ifdef DEBUG_XPATH
printf("libxslt_xsltRegisterExtModuleFunction(%s, %s) called\n",
name, ns_uri);
#endif
if (libxslt_extModuleFunctions == NULL)
libxslt_extModuleFunctions = xmlHashCreate(10);
if (libxslt_extModuleFunctions == NULL) {
py_retval = libxml_intWrap(-1);
return(py_retval);
}
ret = xmlHashAddEntry2(libxslt_extModuleFunctions, name, ns_uri, pyobj_f);
if (ret != 0) {
py_retval = libxml_intWrap(-1);
return(py_retval);
}
Py_XINCREF(pyobj_f);
ret = xsltRegisterExtModuleFunction(name, ns_uri,
libxslt_xmlXPathFuncCallback);
py_retval = libxml_intWrap((int) ret);
return(py_retval);
}
static void
deallocateCallback(void *payload, xmlChar *name ATTRIBUTE_UNUSED) {
PyObject *function = (PyObject *) payload;
#ifdef DEBUG_XPATH
printf("deallocateCallback(%s) called\n", name);
#endif
Py_XDECREF(function);
}
/************************************************************************
* *
* Some customized front-ends *
* *
************************************************************************/
PyObject *
libxslt_xsltApplyStylesheet(PyObject *self ATTRIBUTE_UNUSED, PyObject *args) {
PyObject *py_retval;
xmlDocPtr c_retval;
xsltStylesheetPtr style;
PyObject *pyobj_style;
xmlDocPtr doc;
PyObject *pyobj_doc;
PyObject *pyobj_params;
const char **params = NULL;
int len = 0, i = 0, j;
PyObject *name;
PyObject *value;
if (!PyArg_ParseTuple(args, (char *) "OOO:xsltApplyStylesheet",
&pyobj_style, &pyobj_doc, &pyobj_params))
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);
c_retval = xsltApplyStylesheet(style, doc, params);
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_xsltSaveResultToString(PyObject *self, PyObject *args) {
PyObject *py_retval; /* our final return value, a python string */
xmlChar *buffer;
xmlChar *tmp;
int size = 0;
int emitted = 0;
xmlDocPtr result;
PyObject *pyobj_result;
xsltStylesheetPtr style;
PyObject *pyobj_style;
if (!PyArg_ParseTuple(args, (char *)"OO:xsltSaveResultToString", &pyobj_style, &pyobj_result))
goto FAIL;
result = (xmlDocPtr) PyxmlNode_Get(pyobj_result);
style = (xsltStylesheetPtr) Pystylesheet_Get(pyobj_style);
/* FIXME: We should probably add more restrictive error checking
* and raise an error instead of "just" returning NULL.
* FIXME: Documentation and code for xsltSaveResultToString diff
* -> emmitted will never be positive non-null.
*/
emitted = xsltSaveResultToString(&buffer, &size, result, style);
if(!buffer || emitted < 0)
goto FAIL;
/* We haven't tested the aberrant case of a transformation that
* renders to an empty string. For now we try to play it save.
*/
if(size)
{
buffer[size] = '\0';
py_retval = PyString_FromString((char *) buffer);
xmlFree(buffer);
}
else
py_retval = PyString_FromString("");
return(py_retval);
FAIL:
return(0);
}
/************************************************************************
* *
* Error message callback *
* *
************************************************************************/
static PyObject *libxslt_xsltPythonErrorFuncHandler = NULL;
static PyObject *libxslt_xsltPythonErrorFuncCtxt = NULL;
static void
libxslt_xsltErrorFuncHandler(ATTRIBUTE_UNUSED void *ctx, const char *msg,
...)
{
int size;
int chars;
char *larger;
va_list ap;
char *str;
PyObject *list;
PyObject *message;
PyObject *result;
#ifdef DEBUG_ERROR
printf("libxslt_xsltErrorFuncHandler(%p, %s, ...) called\n", ctx, msg);
#endif
if (libxslt_xsltPythonErrorFuncHandler == NULL) {
va_start(ap, msg);
vfprintf(stdout, msg, ap);
va_end(ap);
} else {
str = (char *) xmlMalloc(150);
if (str == NULL)
return;
size = 150;
while (1) {
va_start(ap, msg);
chars = vsnprintf(str, size, msg, ap);
va_end(ap);
if ((chars > -1) && (chars < size))
break;
if (chars > -1)
size += chars + 1;
else
size += 100;
if ((larger = (char *) xmlRealloc(str, size)) == NULL) {
xmlFree(str);
return;
}
str = larger;
}
list = PyTuple_New(2);
PyTuple_SetItem(list, 0, libxslt_xsltPythonErrorFuncCtxt);
Py_XINCREF(libxslt_xsltPythonErrorFuncCtxt);
message = libxml_charPtrWrap(str);
PyTuple_SetItem(list, 1, message);
result = PyEval_CallObject(libxslt_xsltPythonErrorFuncHandler, list);
Py_XDECREF(list);
Py_XDECREF(result);
}
}
static void
libxslt_xsltErrorInitialize(void)
{
#ifdef DEBUG_ERROR
printf("libxslt_xsltErrorInitialize() called\n");
#endif
xmlSetGenericErrorFunc(NULL, libxslt_xsltErrorFuncHandler);
xsltSetGenericErrorFunc(NULL, libxslt_xsltErrorFuncHandler);
}
PyObject *
libxslt_xsltRegisterErrorHandler(ATTRIBUTE_UNUSED PyObject * self,
PyObject * args)
{
PyObject *py_retval;
PyObject *pyobj_f;
PyObject *pyobj_ctx;
if (!PyArg_ParseTuple
(args, (char *) "OO:xmlRegisterErrorHandler", &pyobj_f,
&pyobj_ctx))
return (NULL);
#ifdef DEBUG_ERROR
printf("libxml_registerXPathFunction(%p, %p) called\n", pyobj_ctx,
pyobj_f);
#endif
if (libxslt_xsltPythonErrorFuncHandler != NULL) {
Py_XDECREF(libxslt_xsltPythonErrorFuncHandler);
}
if (libxslt_xsltPythonErrorFuncCtxt != NULL) {
Py_XDECREF(libxslt_xsltPythonErrorFuncCtxt);
}
Py_XINCREF(pyobj_ctx);
Py_XINCREF(pyobj_f);
/* TODO: check f is a function ! */
libxslt_xsltPythonErrorFuncHandler = pyobj_f;
libxslt_xsltPythonErrorFuncCtxt = pyobj_ctx;
py_retval = libxml_intWrap(1);
return (py_retval);
}
/************************************************************************
* *
* Integrated cleanup *
* *
************************************************************************/
PyObject *
libxslt_xsltCleanup(PyObject *self ATTRIBUTE_UNUSED,
PyObject *args ATTRIBUTE_UNUSED) {
if (libxslt_extModuleFunctions != NULL) {
xmlHashFree(libxslt_extModuleFunctions, deallocateCallback);
}
xsltCleanupGlobals();
xmlCleanupParser();
Py_INCREF(Py_None);
return(Py_None);
}
/************************************************************************
* *
* The registration stuff *
* *
************************************************************************/
static PyMethodDef libxsltMethods[] = {
#include "libxslt-export.c"
{ NULL, NULL, 0, NULL }
};
#ifdef MERGED_MODULES
extern void initlibxml2mod(void);
#endif
void initlibxsltmod(void) {
static int initialized = 0;
PyObject *m;
#ifdef MERGED_MODULES
initlibxml2mod();
#endif
if (initialized != 0)
return;
m = Py_InitModule((char *)"libxsltmod", libxsltMethods);
initialized = 1;
/*
* Specific XSLT initializations
*/
libxslt_xsltErrorInitialize();
xmlInitMemory();
xmlLoadExtDtdDefaultValue = XML_DETECT_IDS | XML_COMPLETE_ATTRS;
xmlDefaultSAXHandler.cdataBlock = NULL;
/*
* Register the EXSLT extensions and the test module
*/
exsltRegisterAll();
}
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