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/*
* xlink.c : implementation of the hyperlinks detection module
* This version supports both XML XLinks and HTML simple links
*
* See Copyright for the status of this software.
*
* daniel@veillard.com
*/
#define IN_LIBXML
#include "libxml.h"
#ifdef LIBXML_XPTR_ENABLED
#include <string.h> /* for memset() only */
#include <ctype.h>
#include <stdlib.h>
#include <libxml/xmlmemory.h>
#include <libxml/tree.h>
#include <libxml/parser.h>
#include <libxml/valid.h>
#include <libxml/xlink.h>
#include <libxml/globals.h>
#define XLINK_NAMESPACE (BAD_CAST "http://www.w3.org/1999/xlink/namespace/")
#define XHTML_NAMESPACE (BAD_CAST "http://www.w3.org/1999/xhtml/")
/****************************************************************
* *
* Default setting and related functions *
* *
****************************************************************/
static xlinkHandlerPtr xlinkDefaultHandler = NULL;
static xlinkNodeDetectFunc xlinkDefaultDetect = NULL;
/**
* xlinkGetDefaultHandler:
*
* Get the default xlink handler.
*
* Returns the current xlinkHandlerPtr value.
*/
xlinkHandlerPtr
xlinkGetDefaultHandler(void) {
return(xlinkDefaultHandler);
}
/**
* xlinkSetDefaultHandler:
* @handler: the new value for the xlink handler block
*
* Set the default xlink handlers
*/
void
xlinkSetDefaultHandler(xlinkHandlerPtr handler) {
xlinkDefaultHandler = handler;
}
/**
* xlinkGetDefaultDetect:
*
* Get the default xlink detection routine
*
* Returns the current function or NULL;
*/
xlinkNodeDetectFunc
xlinkGetDefaultDetect (void) {
return(xlinkDefaultDetect);
}
/**
* xlinkSetDefaultDetect:
* @func: pointer to the new detection routine.
*
* Set the default xlink detection routine
*/
void
xlinkSetDefaultDetect (xlinkNodeDetectFunc func) {
xlinkDefaultDetect = func;
}
/****************************************************************
* *
* The detection routines *
* *
****************************************************************/
/**
* xlinkIsLink:
* @doc: the document containing the node
* @node: the node pointer itself
*
* Check whether the given node carries the attributes needed
* to be a link element (or is one of the linking elements issued
* from the (X)HTML DtDs).
* This routine don't try to do full checking of the link validity
* but tries to detect and return the appropriate link type.
*
* Returns the xlinkType of the node (XLINK_TYPE_NONE if there is no
* link detected.
*/
xlinkType
xlinkIsLink (xmlDocPtr doc, xmlNodePtr node) {
xmlChar *type = NULL, *role = NULL;
xlinkType ret = XLINK_TYPE_NONE;
if (node == NULL) return(XLINK_TYPE_NONE);
if (doc == NULL) doc = node->doc;
if ((doc != NULL) && (doc->type == XML_HTML_DOCUMENT_NODE)) {
/*
* This is an HTML document.
*/
} else if ((node->ns != NULL) &&
(xmlStrEqual(node->ns->href, XHTML_NAMESPACE))) {
/*
* !!!! We really need an IS_XHTML_ELEMENT function from HTMLtree.h @@@
*/
/*
* This is an XHTML element within an XML document
* Check whether it's one of the element able to carry links
* and in that case if it holds the attributes.
*/
}
/*
* We don't prevent a-priori having XML Linking constructs on
* XHTML elements
*/
type = xmlGetNsProp(node, BAD_CAST"type", XLINK_NAMESPACE);
if (type != NULL) {
if (xmlStrEqual(type, BAD_CAST "simple")) {
ret = XLINK_TYPE_SIMPLE;
} else if (xmlStrEqual(type, BAD_CAST "extended")) {
role = xmlGetNsProp(node, BAD_CAST "role", XLINK_NAMESPACE);
if (role != NULL) {
xmlNsPtr xlink;
xlink = xmlSearchNs(doc, node, XLINK_NAMESPACE);
if (xlink == NULL) {
/* Humm, fallback method */
if (xmlStrEqual(role, BAD_CAST"xlink:external-linkset"))
ret = XLINK_TYPE_EXTENDED_SET;
} else {
xmlChar buf[200];
snprintf((char *) buf, sizeof(buf), "%s:external-linkset",
(char *) xlink->prefix);
buf[sizeof(buf) - 1] = 0;
if (xmlStrEqual(role, buf))
ret = XLINK_TYPE_EXTENDED_SET;
}
}
ret = XLINK_TYPE_EXTENDED;
}
}
if (type != NULL) xmlFree(type);
if (role != NULL) xmlFree(role);
return(ret);
}
#endif /* LIBXML_XPTR_ENABLED */
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