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
|
/* xml.y Bison file for limited XML parser (just tags, no text).
Last modified 1997-12-23
This is *NOT* a general-purpose XML parser.
Note that all lists except for the top level one are returned in
reverse order.
Copyright (C) 1997 David Flater.
This program 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 2 of the License, or
(at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
%{
#include "common.hh"
Dstr xmlfilename;
struct xmltag *xmlparsetree;
extern int xmllex ();
extern void xmlerror (const char *);
#define balance(lname,rname) { \
if ((*(lname)) != (*(rname))) { \
Dstr details ("Parse error in XML file "); \
details += xmlfilename; \
details += "\n<"; \
details += (*(lname)); \
details += "> ended by </"; \
details += (*(rname)); \
details += ">"; \
barf (XMLPARSE, details); \
} \
delete rname; }
%}
%union {
struct xmltag *tag;
struct xmlattribute *attribute;
Dstr *value;
}
%token <value> NAME ATTVALUE
%token XMLSTART
%type <tag> tag xml_file taglist
%type <attribute> attribute avlist
%%
xml_file: XMLSTART taglist
{ // Un-reverse the top-level list
struct xmltag *temp;
$$ = NULL;
while ($2) {
temp = $2->next;
$2->next = $$;
$$ = $2;
$2 = temp;
}
xmlparsetree = $$; }
;
taglist: tag
{ $$ = $1; }
| taglist tag
{ $$ = $2;
$$->next = $1; }
;
tag: '<' NAME avlist '>' '<' '/' NAME '>'
{
balance ($2, $7);
$$ = new xmltag;
$$->name = $2;
$$->attributes = $3;
$$->contents = NULL;
$$->next = NULL;
}
| '<' NAME avlist '>' taglist '<' '/' NAME '>'
{
balance ($2, $8);
$$ = new xmltag;
$$->name = $2;
$$->attributes = $3;
$$->contents = $5;
$$->next = NULL;
}
| '<' NAME avlist '/' '>'
{
$$ = new xmltag;
$$->name = $2;
$$->attributes = $3;
$$->contents = NULL;
$$->next = NULL;
}
| '<' NAME '>' '<' '/' NAME '>'
{
balance ($2, $6);
$$ = new xmltag;
$$->name = $2;
$$->attributes = NULL;
$$->contents = NULL;
$$->next = NULL;
}
| '<' NAME '>' taglist '<' '/' NAME '>'
{
balance ($2, $7);
$$ = new xmltag;
$$->name = $2;
$$->attributes = NULL;
$$->contents = $4;
$$->next = NULL;
}
| '<' NAME '/' '>'
{
$$ = new xmltag;
$$->name = $2;
$$->attributes = NULL;
$$->contents = NULL;
$$->next = NULL;
}
;
avlist: attribute
{ $$ = $1; }
| avlist attribute
{ $$ = $2;
$$->next = $1; }
;
attribute: NAME '=' ATTVALUE
{ $$ = new xmlattribute;
$$->name = $1;
$$->value = $3;
$$->next = NULL; }
;
%%
|
