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
|
/* -*-indented-text-*- ----------------------------------------------
*
Copyright (c) 1999 Christian Lindig <lindig@ips.cs.tu-bs.de>. All
rights reserved. See COPYING for details.
* $Id: xmlparse.mly,v 1.1 2002/03/05 14:23:03 monate Exp $
*
* This file implements a parser for XML files.
* See: http://www.w3.org/
*
* A XML file mixes markup data, comments, processing instructions
* (pi) and character data. Since the different kinds of content
* are indistinguishable by the scanner the parser controls
* so-called scanner contexts.
*/
%{
(* Helpers *)
open Xml (* XML abstract syntax *)
open Error (* error() *)
open Xmlstate (* setContext() *)
let n = None (* just to save space *)
%}
/* tokens with value */
%token <string> WORD
%token <string> CHUNK
%token <string> NAME
%token <string> STRING
%token <string> PIOPEN
%token <string> OPEN
%token <string> OPENSLASH
/* token */
%token CLOSE
%token COMMENT
%token DOCTYPE
%token DTDCLOSE
%token DTDOPEN
%token ENCODING
%token EOF
%token EQ
%token ERROR
%token PICLOSE
%token PUBLIC
%token S
%token SLASHCLOSE
%token STANDALONE
%token SYSTEM
%token VERSION
%token XMLCLOSE
%token XMLDECL
%token XMLNAME
%token XMLOPEN
%start document
%type <Xml.document> document
%%
document : prolog topelement misc EOF{ XML($1,$2,$3) }
topelement : element { setContext DataContext;
$1
}
/* xm dt pi */
prolog : xmldecl misc { Prolog($1,None ,$2 ) }
| xmldecl misc doctype misc { Prolog($1,Some($3),$2@$4) }
| misc doctype misc { Prolog(n ,Some($2),$1@$3) }
| misc { Prolog(n ,None ,$1 ) }
misc : /**/ { [] }
| misc pi { $2::$1 }
| misc CHUNK { $1 }
| misc COMMENT { $1 }
dtdopen : DTDOPEN { setContext DeclContext}
dtdclose : DTDCLOSE { setContext DataContext }
doctype : dtdopen NAME ext markup
dtdclose { DTD($2,$3) }
ext : /**/ { None }
| SYSTEM STRING { Some (DTDsys($2)) }
| PUBLIC STRING STRING { Some (DTDpub($2,$3)) }
markup : /**/ { None }
| error { error "DTDs are unsupported" }
element : emptyElemTag { let (n,a) = $1 in
Eempty(n,a)
}
| sTag content eTag { let (sn,a) = $1 in
let en = $3 in
let c = List.rev $2 in
if sn = en then
Eelement(sn,a,c)
else error ("tag mismatch")
}
opn : OPEN { setContext ElementContext; $1 }
opnslash : OPENSLASH { setContext ElementContext; $1 }
cls : CLOSE { setContext DataContext }
slashcls : SLASHCLOSE { setContext DataContext }
sTag : opn attributes cls { ($1,$2) }
eTag : opnslash cls { $1 }
emptyElemTag : opn attributes slashcls { ($1,$2) }
attributes : /**/ { [] }
| attributes attribute { $2::$1 }
attribute : NAME EQ STRING { ($1,$3) }
content : /**/ { [] }
| content CHUNK { Echunk($2)::$1 }
| content element { $2::$1 }
| content pi { Epi($2)::$1 }
| content COMMENT { $1 }
xmlopen : XMLOPEN { setContext DeclContext}
xmlclose : XMLCLOSE { setContext DataContext }
xmlinfo : version encoding sddecl { ($1,$2,Some $3) }
| version { ($1,n ,None ) }
| version encoding { ($1,$2,None ) }
| version sddecl { ($1,n ,Some $2) }
xmldecl : xmlopen xmlinfo xmlclose { match $2 with
(vers,enc,sa) ->
Some (XMLDecl(
vers, (* version *)
sa, (* standalone *)
enc (* encoding *)
))
}
version : VERSION EQ STRING { $3 }
encoding : ENCODING EQ STRING { Some $3 }
sddecl : STANDALONE EQ STRING { match $3 with
| "yes" -> true
| "no" -> false
| _ -> error "yes/no expected"
}
piopen : PIOPEN { setContext PiContext; $1}
pi : piopen picontent PICLOSE { setContext DataContext;
($1,List.rev $2)
}
picontent : /**/ { [] }
| picontent WORD { $2 :: $1 }
|
