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/*
* dynamic.c: Implementation of the EXSLT -- Dynamic module
*
* References:
* http://www.exslt.org/dyn/dyn.html
*
* See Copyright for the status of this software.
*
* Authors:
* Mark Vakoc <mark_vakoc@jdedwards.com>
* Thomas Broyer <tbroyer@ltgt.net>
*
* TODO:
* elements:
* functions:
* min
* max
* sum
* map
* closure
*/
#define IN_LIBEXSLT
#include "libexslt/libexslt.h"
#include <libxml/tree.h>
#include <libxml/xpath.h>
#include <libxml/xpathInternals.h>
#include <libxslt/xsltutils.h>
#include <libxslt/xsltInternals.h>
#include <libxslt/extensions.h>
#include "exslt.h"
/**
* exsltDynEvaluateFunction:
* @ctxt: an XPath parser context
* @nargs: the number of arguments
*
* Evaluates the string as an XPath expression and returns the result
* value, which may be a boolean, number, string, node set, result tree
* fragment or external object.
*/
static void
exsltDynEvaluateFunction(xmlXPathParserContextPtr ctxt, int nargs) {
xmlChar *str = NULL;
xmlXPathObjectPtr ret = NULL;
if (ctxt == NULL)
return;
if (nargs != 1) {
xsltPrintErrorContext(xsltXPathGetTransformContext(ctxt), NULL, NULL);
xsltGenericError(xsltGenericErrorContext,
"dyn:evalute() : invalid number of args %d\n", nargs);
ctxt->error = XPATH_INVALID_ARITY;
return;
}
str = xmlXPathPopString(ctxt);
/* return an empty node-set if an empty string is passed in */
if (!str||!xmlStrlen(str)) {
if (str) xmlFree(str);
valuePush(ctxt,xmlXPathNewNodeSet(NULL));
return;
}
#if LIBXML_VERSION >= 20911
/*
* Recursive evaluation can grow the call stack quickly.
*/
ctxt->context->depth += 5;
#endif
ret = xmlXPathEval(str,ctxt->context);
#if LIBXML_VERSION >= 20911
ctxt->context->depth -= 5;
#endif
if (ret)
valuePush(ctxt,ret);
else {
xsltGenericError(xsltGenericErrorContext,
"dyn:evaluate() : unable to evaluate expression '%s'\n",str);
valuePush(ctxt,xmlXPathNewNodeSet(NULL));
}
xmlFree(str);
return;
}
/**
* exsltDynMapFunction:
* @ctxt: an XPath parser context
* @nargs: the number of arguments
*
* Evaluates the string as an XPath expression and returns the result
* value, which may be a boolean, number, string, node set, result tree
* fragment or external object.
*/
static void
exsltDynMapFunction(xmlXPathParserContextPtr ctxt, int nargs)
{
xmlChar *str = NULL;
xmlNodeSetPtr nodeset = NULL;
xsltTransformContextPtr tctxt;
xmlXPathCompExprPtr comp = NULL;
xmlXPathObjectPtr ret = NULL;
xmlDocPtr oldDoc, container = NULL;
xmlNodePtr oldNode;
int oldContextSize;
int oldProximityPosition;
int i, j;
if (nargs != 2) {
xmlXPathSetArityError(ctxt);
return;
}
str = xmlXPathPopString(ctxt);
if (xmlXPathCheckError(ctxt))
goto cleanup;
nodeset = xmlXPathPopNodeSet(ctxt);
if (xmlXPathCheckError(ctxt))
goto cleanup;
ret = xmlXPathNewNodeSet(NULL);
if (ret == NULL) {
xsltGenericError(xsltGenericErrorContext,
"exsltDynMapFunction: ret == NULL\n");
goto cleanup;
}
tctxt = xsltXPathGetTransformContext(ctxt);
if (tctxt == NULL) {
xsltTransformError(xsltXPathGetTransformContext(ctxt), NULL, NULL,
"dyn:map : internal error tctxt == NULL\n");
goto cleanup;
}
if (str == NULL || !xmlStrlen(str) ||
!(comp = xmlXPathCtxtCompile(tctxt->xpathCtxt, str)))
goto cleanup;
oldDoc = ctxt->context->doc;
oldNode = ctxt->context->node;
oldContextSize = ctxt->context->contextSize;
oldProximityPosition = ctxt->context->proximityPosition;
/**
* since we really don't know we're going to be adding node(s)
* down the road we create the RVT regardless
*/
container = xsltCreateRVT(tctxt);
if (container == NULL) {
xsltTransformError(tctxt, NULL, NULL,
"dyn:map : internal error container == NULL\n");
goto cleanup;
}
xsltRegisterLocalRVT(tctxt, container);
if (nodeset && nodeset->nodeNr > 0) {
xmlXPathNodeSetSort(nodeset);
ctxt->context->contextSize = nodeset->nodeNr;
ctxt->context->proximityPosition = 0;
for (i = 0; i < nodeset->nodeNr; i++) {
xmlXPathObjectPtr subResult = NULL;
xmlNodePtr cur = nodeset->nodeTab[i];
ctxt->context->proximityPosition++;
ctxt->context->node = cur;
if (cur->type == XML_NAMESPACE_DECL) {
/*
* The XPath module sets the owner element of a ns-node on
* the ns->next field.
*/
cur = (xmlNodePtr) ((xmlNsPtr) cur)->next;
if ((cur == NULL) || (cur->type != XML_ELEMENT_NODE)) {
xsltGenericError(xsltGenericErrorContext,
"Internal error in exsltDynMapFunction: "
"Cannot retrieve the doc of a namespace node.\n");
continue;
}
ctxt->context->doc = cur->doc;
} else {
ctxt->context->doc = cur->doc;
}
subResult = xmlXPathCompiledEval(comp, ctxt->context);
if (subResult != NULL) {
switch (subResult->type) {
case XPATH_NODESET:
if (subResult->nodesetval != NULL)
for (j = 0; j < subResult->nodesetval->nodeNr;
j++)
xmlXPathNodeSetAdd(ret->nodesetval,
subResult->nodesetval->
nodeTab[j]);
break;
case XPATH_BOOLEAN:
if (container != NULL) {
xmlNodePtr newChildNode =
xmlNewTextChild((xmlNodePtr) container, NULL,
BAD_CAST "boolean",
BAD_CAST (subResult->
boolval ? "true" : ""));
if (newChildNode != NULL) {
newChildNode->ns =
xmlNewNs(newChildNode,
BAD_CAST
"http://exslt.org/common",
BAD_CAST "exsl");
xmlXPathNodeSetAddUnique(ret->nodesetval,
newChildNode);
}
}
break;
case XPATH_NUMBER:
if (container != NULL) {
xmlChar *val =
xmlXPathCastNumberToString(subResult->
floatval);
xmlNodePtr newChildNode =
xmlNewTextChild((xmlNodePtr) container, NULL,
BAD_CAST "number", val);
if (val != NULL)
xmlFree(val);
if (newChildNode != NULL) {
newChildNode->ns =
xmlNewNs(newChildNode,
BAD_CAST
"http://exslt.org/common",
BAD_CAST "exsl");
xmlXPathNodeSetAddUnique(ret->nodesetval,
newChildNode);
}
}
break;
case XPATH_STRING:
if (container != NULL) {
xmlNodePtr newChildNode =
xmlNewTextChild((xmlNodePtr) container, NULL,
BAD_CAST "string",
subResult->stringval);
if (newChildNode != NULL) {
newChildNode->ns =
xmlNewNs(newChildNode,
BAD_CAST
"http://exslt.org/common",
BAD_CAST "exsl");
xmlXPathNodeSetAddUnique(ret->nodesetval,
newChildNode);
}
}
break;
default:
break;
}
xmlXPathFreeObject(subResult);
}
}
}
ctxt->context->doc = oldDoc;
ctxt->context->node = oldNode;
ctxt->context->contextSize = oldContextSize;
ctxt->context->proximityPosition = oldProximityPosition;
cleanup:
/* restore the xpath context */
if (comp != NULL)
xmlXPathFreeCompExpr(comp);
if (nodeset != NULL)
xmlXPathFreeNodeSet(nodeset);
if (str != NULL)
xmlFree(str);
valuePush(ctxt, ret);
return;
}
/**
* exsltDynRegister:
*
* Registers the EXSLT - Dynamic module
*/
void
exsltDynRegister (void) {
xsltRegisterExtModuleFunction ((const xmlChar *) "evaluate",
EXSLT_DYNAMIC_NAMESPACE,
exsltDynEvaluateFunction);
xsltRegisterExtModuleFunction ((const xmlChar *) "map",
EXSLT_DYNAMIC_NAMESPACE,
exsltDynMapFunction);
}
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