source: trunk/third/libxml2/xlink.c @ 20735

Revision 20735, 4.5 KB checked in by ghudson, 20 years ago (diff)
This commit was generated by cvs2svn to compensate for changes in r20734, which included commits to RCS files with non-trunk default branches.
Line 
1/*
2 * xlink.c : implementation of the hyperlinks detection module
3 *           This version supports both XML XLinks and HTML simple links
4 *
5 * See Copyright for the status of this software.
6 *
7 * daniel@veillard.com
8 */
9
10
11#define IN_LIBXML
12#include "libxml.h"
13
14#ifdef LIBXML_XPTR_ENABLED
15#include <string.h> /* for memset() only */
16#ifdef HAVE_CTYPE_H
17#include <ctype.h>
18#endif
19#ifdef HAVE_STDLIB_H
20#include <stdlib.h>
21#endif
22#ifdef HAVE_SYS_STAT_H
23#include <sys/stat.h>
24#endif
25#ifdef HAVE_FCNTL_H
26#include <fcntl.h>
27#endif
28#ifdef HAVE_UNISTD_H
29#include <unistd.h>
30#endif
31#ifdef HAVE_ZLIB_H
32#include <zlib.h>
33#endif
34
35#include <libxml/xmlmemory.h>
36#include <libxml/tree.h>
37#include <libxml/parser.h>
38#include <libxml/valid.h>
39#include <libxml/xlink.h>
40#include <libxml/globals.h>
41
42#define XLINK_NAMESPACE (BAD_CAST "http://www.w3.org/1999/xlink/namespace/")
43#define XHTML_NAMESPACE (BAD_CAST "http://www.w3.org/1999/xhtml/")
44
45/****************************************************************
46 *                                                              *
47 *           Default setting and related functions              *
48 *                                                              *
49 ****************************************************************/
50 
51static xlinkHandlerPtr xlinkDefaultHandler = NULL;
52static xlinkNodeDetectFunc      xlinkDefaultDetect = NULL;
53
54/**
55 * xlinkGetDefaultHandler:
56 *
57 * Get the default xlink handler.
58 *
59 * Returns the current xlinkHandlerPtr value.
60 */
61xlinkHandlerPtr
62xlinkGetDefaultHandler(void) {
63    return(xlinkDefaultHandler);
64}
65
66
67/**
68 * xlinkSetDefaultHandler:
69 * @handler:  the new value for the xlink handler block
70 *
71 * Set the default xlink handlers
72 */
73void
74xlinkSetDefaultHandler(xlinkHandlerPtr handler) {
75    xlinkDefaultHandler = handler;
76}
77
78/**
79 * xlinkGetDefaultDetect:
80 *
81 * Get the default xlink detection routine
82 *
83 * Returns the current function or NULL;
84 */
85xlinkNodeDetectFunc
86xlinkGetDefaultDetect   (void) {
87    return(xlinkDefaultDetect);
88}
89
90/**
91 * xlinkSetDefaultDetect:
92 * @func: pointer to the new detection routine.
93 *
94 * Set the default xlink detection routine
95 */
96void
97xlinkSetDefaultDetect   (xlinkNodeDetectFunc func) {
98    xlinkDefaultDetect = func;
99}
100
101/****************************************************************
102 *                                                              *
103 *                  The detection routines                      *
104 *                                                              *
105 ****************************************************************/
106
107 
108/**
109 * xlinkIsLink:
110 * @doc:  the document containing the node
111 * @node:  the node pointer itself
112 *
113 * Check whether the given node carries the attributes needed
114 * to be a link element (or is one of the linking elements issued
115 * from the (X)HTML DtDs).
116 * This routine don't try to do full checking of the link validity
117 * but tries to detect and return the appropriate link type.
118 *
119 * Returns the xlinkType of the node (XLINK_TYPE_NONE if there is no
120 *         link detected.
121 */
122xlinkType
123xlinkIsLink     (xmlDocPtr doc, xmlNodePtr node) {
124    xmlChar *type = NULL, *role = NULL;
125    xlinkType ret = XLINK_TYPE_NONE;
126
127    if (node == NULL) return(XLINK_TYPE_NONE);
128    if (doc == NULL) doc = node->doc;
129    if ((doc != NULL) && (doc->type == XML_HTML_DOCUMENT_NODE)) {
130        /*
131         * This is an HTML document.
132         */
133    } else if ((node->ns != NULL) &&
134               (xmlStrEqual(node->ns->href, XHTML_NAMESPACE))) {
135        /*
136         * !!!! We really need an IS_XHTML_ELEMENT function from HTMLtree.h @@@
137         */
138        /*
139         * This is an XHTML element within an XML document
140         * Check whether it's one of the element able to carry links
141         * and in that case if it holds the attributes.
142         */
143    }
144
145    /*
146     * We don't prevent a-priori having XML Linking constructs on
147     * XHTML elements
148     */
149    type = xmlGetNsProp(node, BAD_CAST"type", XLINK_NAMESPACE);
150    if (type != NULL) {
151        if (xmlStrEqual(type, BAD_CAST "simple")) {
152            ret = XLINK_TYPE_SIMPLE;
153        } if (xmlStrEqual(type, BAD_CAST "extended")) {
154            role = xmlGetNsProp(node, BAD_CAST "role", XLINK_NAMESPACE);
155            if (role != NULL) {
156                xmlNsPtr xlink;
157                xlink = xmlSearchNs(doc, node, XLINK_NAMESPACE);
158                if (xlink == NULL) {
159                    /* Humm, fallback method */
160                    if (xmlStrEqual(role, BAD_CAST"xlink:external-linkset"))
161                        ret = XLINK_TYPE_EXTENDED_SET;
162                } else {
163                    xmlChar buf[200];
164                    snprintf((char *) buf, sizeof(buf), "%s:external-linkset",
165                             (char *) xlink->prefix);
166                    buf[sizeof(buf) - 1] = 0;
167                    if (xmlStrEqual(role, buf))
168                        ret = XLINK_TYPE_EXTENDED_SET;
169
170                }
171
172            }
173            ret = XLINK_TYPE_EXTENDED;
174        }
175    }
176
177    if (type != NULL) xmlFree(type);
178    if (role != NULL) xmlFree(role);
179    return(ret);
180}
181#endif /* LIBXML_XPTR_ENABLED */
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