1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
|
/* Interface to libxml2.
Copyright (C) 2010-2012 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#ifdef HAVE_LIBXML2
#include <setjmp.h>
#include <libxml/tree.h>
#include <libxml/parser.h>
#include <libxml/HTMLparser.h>
#include "lisp.h"
#include "buffer.h"
static Lisp_Object Qlibxml2_dll;
#ifdef WINDOWSNT
#include <windows.h>
#include "w32.h"
/* Macro for defining functions that will be loaded from the libxml2 DLL. */
#define DEF_XML2_FN(rettype,func,args) static rettype (FAR CDECL *fn_##func)args
/* Macro for loading libxml2 functions from the library. */
#define LOAD_XML2_FN(lib,func) { \
fn_##func = (void *) GetProcAddress (lib, #func); \
if (!fn_##func) goto bad_library; \
}
DEF_XML2_FN (htmlDocPtr, htmlReadMemory,
(const char *, int, const char *, const char *, int));
DEF_XML2_FN (xmlDocPtr, xmlReadMemory,
(const char *, int, const char *, const char *, int));
DEF_XML2_FN (xmlNodePtr, xmlDocGetRootElement, (xmlDocPtr));
DEF_XML2_FN (void, xmlFreeDoc, (xmlDocPtr));
DEF_XML2_FN (void, xmlCleanupParser, (void));
DEF_XML2_FN (void, xmlCheckVersion, (int));
static int
libxml2_loaded_p (void)
{
Lisp_Object found = Fassq (Qlibxml2_dll, Vlibrary_cache);
if (CONSP (found))
return EQ (XCDR (found), Qt) ? 1 : 0;
return 0;
}
#else /* !WINDOWSNT */
#define fn_htmlReadMemory htmlReadMemory
#define fn_xmlReadMemory xmlReadMemory
#define fn_xmlDocGetRootElement xmlDocGetRootElement
#define fn_xmlFreeDoc xmlFreeDoc
#define fn_xmlCleanupParser xmlCleanupParser
#define fn_xmlCheckVersion xmlCheckVersion
static inine int
libxml2_loaded_p (void)
{
return 1;
}
#endif /* !WINDOWSNT */
static int
init_libxml2_functions (Lisp_Object libraries)
{
#ifdef WINDOWSNT
Lisp_Object found = Fassq (Qlibxml2_dll, Vlibrary_cache);
if (libxml2_loaded_p ())
return 1;
else
{
HMODULE library;
if (!(library = w32_delayed_load (libraries, Qlibxml2_dll)))
{
message ("%s", "libxml2 library not found");
return 0;
}
/* LOAD_XML2_FN jumps to bad_library if it fails to find the
named function. */
LOAD_XML2_FN (library, htmlReadMemory);
LOAD_XML2_FN (library, xmlReadMemory);
LOAD_XML2_FN (library, xmlDocGetRootElement);
LOAD_XML2_FN (library, xmlFreeDoc);
LOAD_XML2_FN (library, xmlCleanupParser);
LOAD_XML2_FN (library, xmlCheckVersion);
Vlibrary_cache = Fcons (Fcons (Qlibxml2_dll, Qt), Vlibrary_cache);
return 1;
}
bad_library:
Vlibrary_cache = Fcons (Fcons (Qlibxml2_dll, Qnil), Vlibrary_cache);
return 0;
#else /* !WINDOWSNT */
return 1;
#endif /* !WINDOWSNT */
}
static Lisp_Object
make_dom (xmlNode *node)
{
if (node->type == XML_ELEMENT_NODE)
{
Lisp_Object result = Fcons (intern ((char *) node->name), Qnil);
xmlNode *child;
xmlAttr *property;
Lisp_Object plist = Qnil;
/* First add the attributes. */
property = node->properties;
while (property != NULL)
{
if (property->children &&
property->children->content)
{
char *content = (char *) property->children->content;
plist = Fcons (Fcons (intern ((char *) property->name),
build_string (content)),
plist);
}
property = property->next;
}
result = Fcons (Fnreverse (plist), result);
/* Then add the children of the node. */
child = node->children;
while (child != NULL)
{
result = Fcons (make_dom (child), result);
child = child->next;
}
return Fnreverse (result);
}
else if (node->type == XML_TEXT_NODE || node->type == XML_CDATA_SECTION_NODE)
{
if (node->content)
return build_string ((char *) node->content);
else
return Qnil;
}
else if (node->type == XML_COMMENT_NODE)
{
if (node->content)
return list3 (intern ("comment"), Qnil,
build_string ((char *) node->content));
else
return Qnil;
}
else
return Qnil;
}
static Lisp_Object
parse_region (Lisp_Object start, Lisp_Object end, Lisp_Object base_url, int htmlp)
{
xmlDoc *doc;
Lisp_Object result = Qnil;
const char *burl = "";
EMACS_INT bytes;
EMACS_INT istart, iend;
fn_xmlCheckVersion (LIBXML_VERSION);
validate_region (&start, &end);
istart = XINT (start);
iend = XINT (end);
if (istart < GPT && GPT < iend)
move_gap (iend);
if (! NILP (base_url))
{
CHECK_STRING (base_url);
burl = SSDATA (base_url);
}
bytes = CHAR_TO_BYTE (iend) - CHAR_TO_BYTE (istart);
if (htmlp)
doc = fn_htmlReadMemory ((char *) BYTE_POS_ADDR (CHAR_TO_BYTE (istart)),
bytes, burl, "utf-8",
HTML_PARSE_RECOVER|HTML_PARSE_NONET|
HTML_PARSE_NOWARNING|HTML_PARSE_NOERROR|
HTML_PARSE_NOBLANKS);
else
doc = fn_xmlReadMemory ((char *) BYTE_POS_ADDR (CHAR_TO_BYTE (istart)),
bytes, burl, "utf-8",
XML_PARSE_NONET|XML_PARSE_NOWARNING|
XML_PARSE_NOBLANKS |XML_PARSE_NOERROR);
if (doc != NULL)
{
/* If the document is just comments, then this should get us the
nodes anyway. */
xmlNode *n = doc->children->next;
Lisp_Object r = Qnil;
while (n) {
if (!NILP (r))
result = Fcons (r, result);
r = make_dom (n);
n = n->next;
}
if (NILP (result)) {
/* The document isn't just comments, so get the tree the
proper way. */
xmlNode *node = fn_xmlDocGetRootElement (doc);
if (node != NULL)
result = make_dom (node);
} else
result = Fcons (intern ("top"),
Fcons (Qnil, Fnreverse (Fcons (r, result))));
fn_xmlFreeDoc (doc);
}
return result;
}
void
xml_cleanup_parser (void)
{
if (libxml2_loaded_p ())
fn_xmlCleanupParser ();
}
DEFUN ("libxml-parse-html-region", Flibxml_parse_html_region,
Slibxml_parse_html_region,
2, 3, 0,
doc: /* Parse the region as an HTML document and return the parse tree.
If BASE-URL is non-nil, it is used to expand relative URLs. */)
(Lisp_Object start, Lisp_Object end, Lisp_Object base_url)
{
if (init_libxml2_functions (Vdynamic_library_alist))
return parse_region (start, end, base_url, 1);
return Qnil;
}
DEFUN ("libxml-parse-xml-region", Flibxml_parse_xml_region,
Slibxml_parse_xml_region,
2, 3, 0,
doc: /* Parse the region as an XML document and return the parse tree.
If BASE-URL is non-nil, it is used to expand relative URLs. */)
(Lisp_Object start, Lisp_Object end, Lisp_Object base_url)
{
if (init_libxml2_functions (Vdynamic_library_alist))
return parse_region (start, end, base_url, 0);
return Qnil;
}
/***********************************************************************
Initialization
***********************************************************************/
void
syms_of_xml (void)
{
defsubr (&Slibxml_parse_html_region);
defsubr (&Slibxml_parse_xml_region);
DEFSYM (Qlibxml2_dll, "libxml2");
}
#endif /* HAVE_LIBXML2 */
|