xlink.c
上传用户:sy_wanhua
上传日期:2013-07-25
资源大小:3048k
文件大小:4k
- /*
- * 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@w3.org
- */
- #ifdef WIN32
- #include "win32config.h"
- #else
- #include "config.h"
- #endif
- #include <stdio.h>
- #include <string.h> /* for memset() only */
- #ifdef HAVE_CTYPE_H
- #include <ctype.h>
- #endif
- #ifdef HAVE_STDLIB_H
- #include <stdlib.h>
- #endif
- #ifdef HAVE_SYS_STAT_H
- #include <sys/stat.h>
- #endif
- #ifdef HAVE_FCNTL_H
- #include <fcntl.h>
- #endif
- #ifdef HAVE_UNISTD_H
- #include <unistd.h>
- #endif
- #ifdef HAVE_ZLIB_H
- #include <zlib.h>
- #endif
- #include <libxml/xmlmemory.h>
- #include <libxml/tree.h>
- #include <libxml/parser.h>
- #include <libxml/valid.h>
- #include <libxml/xlink.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 *
- * *
- ****************************************************************/
-
- xlinkHandlerPtr xlinkDefaultHandler = NULL;
- xlinkNodeDetectFunc xlinkDefaultDetect = NULL;
- /**
- * xlinkGetDefaultHandler:
- *
- * Get the default xlink handler.
- *
- * Returns the current xlinkHandlerPtr value.
- */
- xlinkHandlerPtr
- xlinkGetDefaultHandler(void) {
- return(xlinkDefaultHandler);
- }
- /**
- * xlinkGetDefaultHandler:
- * @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 detction 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) &&
- (!xmlStrcmp(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 (xmlStrcmp(type, BAD_CAST "simple")) {
- ret = XLINK_TYPE_SIMPLE;
- } if (xmlStrcmp(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 (!xmlStrcmp(role, BAD_CAST"xlink:external-linkset"))
- ret = XLINK_TYPE_EXTENDED_SET;
- } else {
- xmlChar buf[200];
- #ifdef HAVE_SNPRINTF
- snprintf((char *) buf, 199, "%s:external-linkset",
- (char *) xlink->prefix);
- #else
- sprintf((char *) buf, "%s:external-linkset",
- (char *) xlink->prefix);
- #endif
- if (!xmlStrcmp(role, buf))
- ret = XLINK_TYPE_EXTENDED_SET;
- }
- }
- ret = XLINK_TYPE_EXTENDED;
- }
- }
- if (type != NULL) xmlFree(type);
- if (role != NULL) xmlFree(role);
- return(ret);
- }