documents.c

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/*
 * documents.c: Implementation of the documents handling
 *
 * See Copyright for the status of this software.
 *
 * daniel@veillard.com
 */

#define IN_LIBXSLT
#include "libxslt.h"

#include <string.h>

#include <libxml/xmlmemory.h>
#include <libxml/tree.h>
#include <libxml/hash.h>
#include <libxml/parser.h>
#include <libxml/parserInternals.h>
#include "xslt.h"
#include "xsltInternals.h"
#include "xsltutils.h"
#include "documents.h"
#include "transform.h"
#include "imports.h"
#include "keys.h"
#include "security.h"

#ifdef LIBXML_XINCLUDE_ENABLED
#include <libxml/xinclude.h>
#endif

#define WITH_XSLT_DEBUG_DOCUMENTS

#ifdef WITH_XSLT_DEBUG
#define WITH_XSLT_DEBUG_DOCUMENTS
#endif

/************************************************************************
 *                                  *
 *      Hooks for the document loader               *
 *                                  *
 ************************************************************************/

static xmlDocPtr
xsltDocDefaultLoaderFunc(const xmlChar * URI, xmlDictPtr dict, int options,
                         void *ctxt ATTRIBUTE_UNUSED,
             xsltLoadType type ATTRIBUTE_UNUSED)
{
    xmlParserCtxtPtr pctxt;
    xmlParserInputPtr inputStream;
    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);
    inputStream = xmlLoadExternalEntity((const char *) URI, NULL, pctxt);
    if (inputStream == NULL) {
        xmlFreeParserCtxt(pctxt);
    return(NULL);
    }
    inputPush(pctxt, inputStream);
    if (pctxt->directory == NULL)
        pctxt->directory = xmlParserGetDirectory((const char *) URI);

    xmlParseDocument(pctxt);

    if (pctxt->wellFormed) {
        doc = pctxt->myDoc;
    }
    else {
        doc = NULL;
        xmlFreeDoc(pctxt->myDoc);
        pctxt->myDoc = NULL;
    }
    xmlFreeParserCtxt(pctxt);

    return(doc);
}


xsltDocLoaderFunc xsltDocDefaultLoader = xsltDocDefaultLoaderFunc;

void
xsltSetLoaderFunc(xsltDocLoaderFunc f) {
    if (f == NULL)
        xsltDocDefaultLoader = xsltDocDefaultLoaderFunc;
    else
        xsltDocDefaultLoader = f;
}

/************************************************************************
 *                                  *
 *          Module interfaces               *
 *                                  *
 ************************************************************************/

xsltDocumentPtr 
xsltNewDocument(xsltTransformContextPtr ctxt, xmlDocPtr doc) {
    xsltDocumentPtr cur;

    cur = (xsltDocumentPtr) xmlMalloc(sizeof(xsltDocument));
    if (cur == NULL) {
    xsltTransformError(ctxt, NULL, (xmlNodePtr) doc,
        "xsltNewDocument : malloc failed\n");
    return(NULL);
    }
    memset(cur, 0, sizeof(xsltDocument));
    cur->doc = doc;
    if (ctxt != NULL) {
        if (! XSLT_IS_RES_TREE_FRAG(doc)) {
        cur->next = ctxt->docList;
        ctxt->docList = cur;
    }
    /*
    * A key with a specific name for a specific document
    * will only be computed if there's a call to the key()
    * function using that specific name for that specific
    * document. I.e. computation of keys will be done in
    * xsltGetKey() (keys.c) on an on-demand basis.
    *
    * xsltInitCtxtKeys(ctxt, cur); not called here anymore
    */
    }
    return(cur);
}

xsltDocumentPtr 
xsltNewStyleDocument(xsltStylesheetPtr style, xmlDocPtr doc) {
    xsltDocumentPtr cur;

    cur = (xsltDocumentPtr) xmlMalloc(sizeof(xsltDocument));
    if (cur == NULL) {
    xsltTransformError(NULL, style, (xmlNodePtr) doc,
        "xsltNewStyleDocument : malloc failed\n");
    return(NULL);
    }
    memset(cur, 0, sizeof(xsltDocument));
    cur->doc = doc;
    if (style != NULL) {
    cur->next = style->docList;
    style->docList = cur;
    }
    return(cur);
}

void    
xsltFreeStyleDocuments(xsltStylesheetPtr style) {
    xsltDocumentPtr doc, cur;
#ifdef XSLT_REFACTORED_XSLT_NSCOMP
    xsltNsMapPtr nsMap;
#endif
    
    if (style == NULL)
    return;

#ifdef XSLT_REFACTORED_XSLT_NSCOMP
    if (XSLT_HAS_INTERNAL_NSMAP(style))
    nsMap = XSLT_GET_INTERNAL_NSMAP(style);
    else
    nsMap = NULL;    
#endif   

    cur = style->docList;
    while (cur != NULL) {
    doc = cur;
    cur = cur->next;
#ifdef XSLT_REFACTORED_XSLT_NSCOMP
    /*
    * Restore all changed namespace URIs of ns-decls.
    */
    if (nsMap)
        xsltRestoreDocumentNamespaces(nsMap, doc->doc);
#endif
    xsltFreeDocumentKeys(doc);
    if (!doc->main)
        xmlFreeDoc(doc->doc);
        xmlFree(doc);
    }
}

void    
xsltFreeDocuments(xsltTransformContextPtr ctxt) {
    xsltDocumentPtr doc, cur;

    cur = ctxt->docList;
    while (cur != NULL) {
    doc = cur;
    cur = cur->next;
    xsltFreeDocumentKeys(doc);
    if (!doc->main)
        xmlFreeDoc(doc->doc);
        xmlFree(doc);
    }
    cur = ctxt->styleList;
    while (cur != NULL) {
    doc = cur;
    cur = cur->next;
    xsltFreeDocumentKeys(doc);
    if (!doc->main)
        xmlFreeDoc(doc->doc);
        xmlFree(doc);
    }
}

xsltDocumentPtr 
xsltLoadDocument(xsltTransformContextPtr ctxt, const xmlChar *URI) {
    xsltDocumentPtr ret;
    xmlDocPtr doc;

    if ((ctxt == NULL) || (URI == NULL))
    return(NULL);

    /*
     * Security framework check
     */
    if (ctxt->sec != NULL) {
    int res;
    
    res = xsltCheckRead(ctxt->sec, ctxt, URI);
    if (res == 0) {
        xsltTransformError(ctxt, NULL, NULL,
         "xsltLoadDocument: read rights for %s denied\n",
                 URI);
        return(NULL);
    }
    }

    /*
     * Walk the context list to find the document if preparsed
     */
    ret = ctxt->docList;
    while (ret != NULL) {
    if ((ret->doc != NULL) && (ret->doc->URL != NULL) &&
        (xmlStrEqual(ret->doc->URL, URI)))
        return(ret);
    ret = ret->next;
    }

    doc = xsltDocDefaultLoader(URI, ctxt->dict, ctxt->parserOptions,
                               (void *) ctxt, XSLT_LOAD_DOCUMENT);

    if (doc == NULL)
    return(NULL);

    if (ctxt->xinclude != 0) {
#ifdef LIBXML_XINCLUDE_ENABLED
#if LIBXML_VERSION >= 20603
    xmlXIncludeProcessFlags(doc, ctxt->parserOptions);
#else
    xmlXIncludeProcess(doc);
#endif
#else
    xsltTransformError(ctxt, NULL, NULL,
        "xsltLoadDocument(%s) : XInclude processing not compiled in\n",
                     URI);
#endif
    }
    /*
     * Apply white-space stripping if asked for
     */
    if (xsltNeedElemSpaceHandling(ctxt))
    xsltApplyStripSpaces(ctxt, xmlDocGetRootElement(doc));
    if (ctxt->debugStatus == XSLT_DEBUG_NONE)
    xmlXPathOrderDocElems(doc);

    ret = xsltNewDocument(ctxt, doc);
    return(ret);
}

xsltDocumentPtr 
xsltLoadStyleDocument(xsltStylesheetPtr style, const xmlChar *URI) {
    xsltDocumentPtr ret;
    xmlDocPtr doc;
    xsltSecurityPrefsPtr sec;

    if ((style == NULL) || (URI == NULL))
    return(NULL);

    /*
     * Security framework check
     */
    sec = xsltGetDefaultSecurityPrefs();
    if (sec != NULL) {
    int res;

    res = xsltCheckRead(sec, NULL, URI);
    if (res == 0) {
        xsltTransformError(NULL, NULL, NULL,
         "xsltLoadStyleDocument: read rights for %s denied\n",
                 URI);
        return(NULL);
    }
    }

    /*
     * Walk the context list to find the document if preparsed
     */
    ret = style->docList;
    while (ret != NULL) {
    if ((ret->doc != NULL) && (ret->doc->URL != NULL) &&
        (xmlStrEqual(ret->doc->URL, URI)))
        return(ret);
    ret = ret->next;
    }

    doc = xsltDocDefaultLoader(URI, style->dict, XSLT_PARSE_OPTIONS,
                               (void *) style, XSLT_LOAD_STYLESHEET);
    if (doc == NULL)
    return(NULL);

    ret = xsltNewStyleDocument(style, doc);
    return(ret);
}

xsltDocumentPtr
xsltFindDocument (xsltTransformContextPtr ctxt, xmlDocPtr doc) {
    xsltDocumentPtr ret;

    if ((ctxt == NULL) || (doc == NULL))
    return(NULL);

    /*
     * Walk the context list to find the document
     */
    ret = ctxt->docList;
    while (ret != NULL) {
    if (ret->doc == doc)
        return(ret);
    ret = ret->next;
    }
    if (doc == ctxt->style->doc)
    return(ctxt->document);
    return(NULL);
}