Annotation of embedaddon/libxml2/xlink.c, revision 1.1.1.2
1.1 misho 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: ****************************************************************/
1.1.1.2 ! misho 50:
1.1 misho 51: static xlinkHandlerPtr xlinkDefaultHandler = NULL;
52: static xlinkNodeDetectFunc xlinkDefaultDetect = NULL;
53:
54: /**
55: * xlinkGetDefaultHandler:
56: *
57: * Get the default xlink handler.
58: *
59: * Returns the current xlinkHandlerPtr value.
60: */
61: xlinkHandlerPtr
62: xlinkGetDefaultHandler(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: */
73: void
74: xlinkSetDefaultHandler(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: */
85: xlinkNodeDetectFunc
86: xlinkGetDefaultDetect (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: */
1.1.1.2 ! misho 96: void
1.1 misho 97: xlinkSetDefaultDetect (xlinkNodeDetectFunc func) {
98: xlinkDefaultDetect = func;
99: }
100:
101: /****************************************************************
102: * *
103: * The detection routines *
104: * *
105: ****************************************************************/
106:
1.1.1.2 ! misho 107:
1.1 misho 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: */
1.1.1.2 ! misho 122: xlinkType
1.1 misho 123: xlinkIsLink (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 */
1.1.1.2 ! misho 160: if (xmlStrEqual(role, BAD_CAST"xlink:external-linkset"))
1.1 misho 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 */
182: #define bottom_xlink
183: #include "elfgcchack.h"
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