blob: 17ec77f66fd7111bbf13a8ee41e5a9b6ce1e7198 [file] [log] [blame]
Owen Taylor3473f882001-02-23 17:55:21 +00001/*
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 *
Daniel Veillardc5d64342001-06-24 12:13:24 +00007 * daniel@veillard.com
Owen Taylor3473f882001-02-23 17:55:21 +00008 */
9
10
Daniel Veillard34ce8be2002-03-18 19:37:11 +000011#define IN_LIBXML
Bjorn Reese70a9da52001-04-21 16:57:29 +000012#include "libxml.h"
Owen Taylor3473f882001-02-23 17:55:21 +000013
Owen Taylor3473f882001-02-23 17:55:21 +000014#include <string.h> /* for memset() only */
15#ifdef HAVE_CTYPE_H
16#include <ctype.h>
17#endif
18#ifdef HAVE_STDLIB_H
19#include <stdlib.h>
20#endif
21#ifdef HAVE_SYS_STAT_H
22#include <sys/stat.h>
23#endif
24#ifdef HAVE_FCNTL_H
25#include <fcntl.h>
26#endif
27#ifdef HAVE_UNISTD_H
28#include <unistd.h>
29#endif
30#ifdef HAVE_ZLIB_H
31#include <zlib.h>
32#endif
33
34#include <libxml/xmlmemory.h>
35#include <libxml/tree.h>
36#include <libxml/parser.h>
37#include <libxml/valid.h>
38#include <libxml/xlink.h>
Daniel Veillard3c01b1d2001-10-17 15:58:35 +000039#include <libxml/globals.h>
Owen Taylor3473f882001-02-23 17:55:21 +000040
41#define XLINK_NAMESPACE (BAD_CAST "http://www.w3.org/1999/xlink/namespace/")
42#define XHTML_NAMESPACE (BAD_CAST "http://www.w3.org/1999/xhtml/")
43
44/****************************************************************
45 * *
46 * Default setting and related functions *
47 * *
48 ****************************************************************/
49
Daniel Veillardd0463562001-10-13 09:15:48 +000050static xlinkHandlerPtr xlinkDefaultHandler = NULL;
51static xlinkNodeDetectFunc xlinkDefaultDetect = NULL;
Owen Taylor3473f882001-02-23 17:55:21 +000052
53/**
54 * xlinkGetDefaultHandler:
55 *
56 * Get the default xlink handler.
57 *
58 * Returns the current xlinkHandlerPtr value.
59 */
60xlinkHandlerPtr
61xlinkGetDefaultHandler(void) {
62 return(xlinkDefaultHandler);
63}
64
65
66/**
67 * xlinkSetDefaultHandler:
68 * @handler: the new value for the xlink handler block
69 *
70 * Set the default xlink handlers
71 */
72void
73xlinkSetDefaultHandler(xlinkHandlerPtr handler) {
74 xlinkDefaultHandler = handler;
75}
76
77/**
78 * xlinkGetDefaultDetect:
79 *
80 * Get the default xlink detection routine
81 *
82 * Returns the current function or NULL;
83 */
84xlinkNodeDetectFunc
85xlinkGetDefaultDetect (void) {
86 return(xlinkDefaultDetect);
87}
88
89/**
90 * xlinkSetDefaultDetect:
Daniel Veillardcbaf3992001-12-31 16:16:02 +000091 * @func: pointer to the new detection routine.
Owen Taylor3473f882001-02-23 17:55:21 +000092 *
93 * Set the default xlink detection routine
94 */
95void
96xlinkSetDefaultDetect (xlinkNodeDetectFunc func) {
97 xlinkDefaultDetect = func;
98}
99
100/****************************************************************
101 * *
102 * The detection routines *
103 * *
104 ****************************************************************/
105
106
107/**
108 * xlinkIsLink:
109 * @doc: the document containing the node
110 * @node: the node pointer itself
111 *
112 * Check whether the given node carries the attributes needed
113 * to be a link element (or is one of the linking elements issued
114 * from the (X)HTML DtDs).
115 * This routine don't try to do full checking of the link validity
116 * but tries to detect and return the appropriate link type.
117 *
118 * Returns the xlinkType of the node (XLINK_TYPE_NONE if there is no
119 * link detected.
120 */
121xlinkType
122xlinkIsLink (xmlDocPtr doc, xmlNodePtr node) {
123 xmlChar *type = NULL, *role = NULL;
124 xlinkType ret = XLINK_TYPE_NONE;
125
126 if (node == NULL) return(XLINK_TYPE_NONE);
127 if (doc == NULL) doc = node->doc;
128 if ((doc != NULL) && (doc->type == XML_HTML_DOCUMENT_NODE)) {
129 /*
130 * This is an HTML document.
131 */
132 } else if ((node->ns != NULL) &&
133 (xmlStrEqual(node->ns->href, XHTML_NAMESPACE))) {
134 /*
135 * !!!! We really need an IS_XHTML_ELEMENT function from HTMLtree.h @@@
136 */
137 /*
138 * This is an XHTML element within an XML document
139 * Check whether it's one of the element able to carry links
140 * and in that case if it holds the attributes.
141 */
142 }
143
144 /*
145 * We don't prevent a-priori having XML Linking constructs on
146 * XHTML elements
147 */
148 type = xmlGetNsProp(node, BAD_CAST"type", XLINK_NAMESPACE);
149 if (type != NULL) {
150 if (!xmlStrEqual(type, BAD_CAST "simple")) {
151 ret = XLINK_TYPE_SIMPLE;
152 } if (!xmlStrEqual(type, BAD_CAST "extended")) {
153 role = xmlGetNsProp(node, BAD_CAST "role", XLINK_NAMESPACE);
154 if (role != NULL) {
155 xmlNsPtr xlink;
156 xlink = xmlSearchNs(doc, node, XLINK_NAMESPACE);
157 if (xlink == NULL) {
158 /* Humm, fallback method */
159 if (xmlStrEqual(role, BAD_CAST"xlink:external-linkset"))
160 ret = XLINK_TYPE_EXTENDED_SET;
161 } else {
162 xmlChar buf[200];
Owen Taylor3473f882001-02-23 17:55:21 +0000163 snprintf((char *) buf, sizeof(buf), "%s:external-linkset",
164 (char *) xlink->prefix);
Owen Taylor3473f882001-02-23 17:55:21 +0000165 buf[sizeof(buf) - 1] = 0;
166 if (xmlStrEqual(role, buf))
167 ret = XLINK_TYPE_EXTENDED_SET;
168
169 }
170
171 }
172 ret = XLINK_TYPE_EXTENDED;
173 }
174 }
175
176 if (type != NULL) xmlFree(type);
177 if (role != NULL) xmlFree(role);
178 return(ret);
179}