root/third_party/libxslt/libexslt/common.c

DEFINITIONS

1. exsltNodeSetFunction
2. exsltObjectTypeFunction
3. exsltCommonRegister

#define IN_LIBEXSLT
#include "libexslt/libexslt.h"

#if defined(WIN32) && !defined (__CYGWIN__) && (!__MINGW32__)
#include <win32config.h>
#else
#include "config.h"
#endif

#include <libxml/tree.h>
#include <libxml/xpath.h>
#include <libxml/xpathInternals.h>

#include <libxslt/xsltconfig.h>
#include <libxslt/xsltutils.h>
#include <libxslt/xsltInternals.h>
#include <libxslt/extensions.h>
#include <libxslt/transform.h>
#include <libxslt/extra.h>
#include <libxslt/preproc.h>

#include "exslt.h"

static void
exsltNodeSetFunction (xmlXPathParserContextPtr ctxt, int nargs) {
    if (nargs != 1) {
        xmlXPathSetArityError(ctxt);
        return;
    }
    if (xmlXPathStackIsNodeSet (ctxt)) {
        xsltFunctionNodeSet (ctxt, nargs);
        return;
    } else {
        xmlDocPtr fragment;
        xsltTransformContextPtr tctxt = xsltXPathGetTransformContext(ctxt);
        xmlNodePtr txt;
        xmlChar *strval;
        xmlXPathObjectPtr obj;
        /*
        * SPEC EXSLT:
        * "You can also use this function to turn a string into a text
        * node, which is helpful if you want to pass a string to a
        * function that only accepts a node-set."
        */
        fragment = xsltCreateRVT(tctxt);
        if (fragment == NULL) {
            xsltTransformError(tctxt, NULL, tctxt->inst,
                "exsltNodeSetFunction: Failed to create a tree fragment.\n");
            tctxt->state = XSLT_STATE_STOPPED; 
            return;
        }
        xsltRegisterLocalRVT(tctxt, fragment);

        strval = xmlXPathPopString (ctxt);
        
        txt = xmlNewDocText (fragment, strval);
        xmlAddChild((xmlNodePtr) fragment, txt);
        obj = xmlXPathNewNodeSet(txt);  
        if (obj == NULL) {
            xsltTransformError(tctxt, NULL, tctxt->inst,
                "exsltNodeSetFunction: Failed to create a node set object.\n");
            tctxt->state = XSLT_STATE_STOPPED;
        } else {
            /*
             * Mark it as a function result in order to avoid garbage
             * collecting of tree fragments
             */
            xsltExtensionInstructionResultRegister(tctxt, obj);
        }
        if (strval != NULL)
            xmlFree (strval);
        
        valuePush (ctxt, obj);
    }
}

static void
exsltObjectTypeFunction (xmlXPathParserContextPtr ctxt, int nargs) {
    xmlXPathObjectPtr obj, ret;

    if (nargs != 1) {
        xmlXPathSetArityError(ctxt);
        return;
    }

    obj = valuePop(ctxt);

    switch (obj->type) {
    case XPATH_STRING:
        ret = xmlXPathNewCString("string");
        break;
    case XPATH_NUMBER:
        ret = xmlXPathNewCString("number");
        break;
    case XPATH_BOOLEAN:
        ret = xmlXPathNewCString("boolean");
        break;
    case XPATH_NODESET:
        ret = xmlXPathNewCString("node-set");
        break;
    case XPATH_XSLT_TREE:
        ret = xmlXPathNewCString("RTF");
        break;
    case XPATH_USERS:
        ret = xmlXPathNewCString("external");
        break;
    default:
        xsltGenericError(xsltGenericErrorContext,
                "object-type() invalid arg\n");
        ctxt->error = XPATH_INVALID_TYPE;
        xmlXPathFreeObject(obj);
        return;
    }
    xmlXPathFreeObject(obj);
    valuePush(ctxt, ret);
}


/**
 * exsltCommonRegister:
 *
 * Registers the EXSLT - Common module
 */

void
exsltCommonRegister (void) {
    xsltRegisterExtModuleFunction((const xmlChar *) "node-set",
                                  EXSLT_COMMON_NAMESPACE,
                                  exsltNodeSetFunction);
    xsltRegisterExtModuleFunction((const xmlChar *) "object-type",
                                  EXSLT_COMMON_NAMESPACE,
                                  exsltObjectTypeFunction);
    xsltRegisterExtModuleElement((const xmlChar *) "document",
                                 EXSLT_COMMON_NAMESPACE,
                                 (xsltPreComputeFunction) xsltDocumentComp,
                                 (xsltTransformFunction) xsltDocumentElem);
}