#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;
    }
    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);
}
