xml/libxml2libs/src/libxml2/libxml2_xlink.c
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 17 Dec 2009 09:29:21 +0200
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/*
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 * libxml2_xlink.c : implementation of the hyperlinks detection module
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 *                   This version supports both XML XLinks and HTML simple links
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 *
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 * See Copyright for the status of this software.
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 *
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 * daniel@veillard.com
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 * Portion Copyright © 2009 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. 
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 */
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#define IN_LIBXML
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#include "xmlenglibxml.h"
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#ifdef LIBXML_XPTR_ENABLED
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#include <string.h> /* for memset() only */
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#ifdef HAVE_CTYPE_H
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#include <ctype.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_ZLIB_H
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#include <zlib.h>
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#endif
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#include <libxml2_xmlmemory.h>
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#include <libxml2_tree.h>
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#include <libxml2_parser.h>
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#include <libxml2_valid.h>
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#include <libxml2_xlink.h>
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#include <libxml2_globals.h>
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#define XLINK_NAMESPACE (BAD_CAST "http://www.w3.org/1999/xlink/namespace/")
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#define XHTML_NAMESPACE (BAD_CAST "http://www.w3.org/1999/xhtml/")
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/****************************************************************
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 *                                                              *
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 *           Default setting and related functions              *
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 *                                                              *
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 ****************************************************************/
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/**
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 * xlinkGetDefaultHandler:
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 *
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 * Get the default xlink handler.
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 *
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 * Returns the current xlinkHandlerPtr value.
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 */
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xlinkHandlerPtr
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xlinkGetDefaultHandler(void) {
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    return(xlinkDefaultHandler);
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}
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/**
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 * xlinkSetDefaultHandler:
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 * @param handler the new value for the xlink handler block
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 *
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 * Set the default xlink handlers
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 */
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void
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xlinkSetDefaultHandler(xlinkHandlerPtr handler) {
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    xlinkDefaultHandler = handler;
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}
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/**
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 * xlinkGetDefaultDetect:
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 *
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 * Get the default xlink detection routine
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 *
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 * Returns the current function or NULL;
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 */
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xlinkNodeDetectFunc
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xlinkGetDefaultDetect   (void) {
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    return(xlinkDefaultDetect);
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}
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/**
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 * xlinkSetDefaultDetect:
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 * @param func pointer to the new detection routine.
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 *
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 * Set the default xlink detection routine
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 */
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void
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xlinkSetDefaultDetect   (xlinkNodeDetectFunc func) {
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    xlinkDefaultDetect = func;
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}
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/****************************************************************
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 *                                                              *
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 *                  The detection routines                      *
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 *                                                              *
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 ****************************************************************/
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/**
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 * xlinkIsLink:
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 * @param doc the document containing the node
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 * @param node the node pointer itself
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 *
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 * Check whether the given node carries the attributes needed
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 * to be a link element (or is one of the linking elements issued
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 * from the (X)HTML DtDs).
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 * This routine don't try to do full checking of the link validity
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 * but tries to detect and return the appropriate link type.
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 *
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 * Returns the xlinkType of the node (XLINK_TYPE_NONE if there is no
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 *         link detected.
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 */
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xlinkType
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xlinkIsLink     (xmlDocPtr doc, xmlNodePtr node) {
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    xmlChar *type = NULL, *role = NULL;
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    xlinkType ret = XLINK_TYPE_NONE;
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    if (node == NULL) return(XLINK_TYPE_NONE);
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    if (doc == NULL) doc = node->doc;
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    if ((doc != NULL) && (doc->type == XML_HTML_DOCUMENT_NODE)) {
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        /*
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         * This is an HTML document.
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         */
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    } else if ((node->ns != NULL) &&
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               (xmlStrEqual(node->ns->href, XHTML_NAMESPACE))) {
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        /*
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         * !!!! We really need an IS_XHTML_ELEMENT function from HTMLtree.h @@@
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         */
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        /*
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         * This is an XHTML element within an XML document
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         * Check whether it's one of the element able to carry links
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         * and in that case if it holds the attributes.
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         */
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    }
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    /*
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     * We don't prevent a-priori having XML Linking constructs on
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     * XHTML elements
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     */
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    type = xmlGetNsProp(node, BAD_CAST"type", XLINK_NAMESPACE);
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    if (type != NULL) {
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        if (xmlStrEqual(type, BAD_CAST "simple")) {
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            ret = XLINK_TYPE_SIMPLE;
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        } if (xmlStrEqual(type, BAD_CAST "extended")) {
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            role = xmlGetNsProp(node, BAD_CAST "role", XLINK_NAMESPACE);
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            if (role != NULL) {
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                xmlNsPtr xlink;
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                xlink = xmlSearchNs(doc, node, XLINK_NAMESPACE);
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                if (xlink == NULL) {
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                    /* Humm, fallback method */
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                    if (xmlStrEqual(role, BAD_CAST"xlink:external-linkset"))
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                        ret = XLINK_TYPE_EXTENDED_SET;
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                } else {
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                    xmlChar buf[200];
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                    snprintf((char *) buf, sizeof(buf), "%s:external-linkset",
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                             (char *) xlink->prefix);
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                    buf[sizeof(buf) - 1] = 0;
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                    if (xmlStrEqual(role, buf))
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                        ret = XLINK_TYPE_EXTENDED_SET;
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                }
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            }
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            ret = XLINK_TYPE_EXTENDED;
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        }
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    }
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    if (type != NULL) xmlFree(type);
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    if (role != NULL) xmlFree(role);
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    return(ret);
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}
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#endif /* LIBXML_XPTR_ENABLED */