/
bnf_2.1.0.html
301 lines (258 loc) · 8.91 KB
/
bnf_2.1.0.html
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
293
294
295
296
297
298
299
300
301
<!DOCTYPE html>
<html lang="ja-JP">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta http-equiv="Content-Language" content="ja-JP">
<link rel="stylesheet" type="text/css" href="../style.css">
<link rel="icon" type="image/png" href="../rurema.png">
<title>疑似BNFによるRubyの文法</title>
</head>
<body>
<p>
<a href="../doc/index.html">Ruby 2.1.0 リファレンスマニュアル</a>
> 疑似BNFによるRubyの文法
</p>
<h1>疑似BNFによるRubyの文法</h1>
<p>
以下に疑似BNFによるRubyの文法を示します。より詳しくは parse.y を
参照してください。sample/exyacc.rbを使うと規則だけを取り出せますので
活用しましょう。
</p>
<p>
((-このBNFはまだ完全に1.6対応していません。[[unknown:執筆者募集]]-))
</p>
<pre>
PROGRAM : COMPSTMT
COMPSTMT : STMT (TERM EXPR)* [TERM]
STMT : CALL do [`|' [BLOCK_VAR] `|'] COMPSTMT end
| LHS `=' COMMAND [do [`|' [BLOCK_VAR] `|'] COMPSTMT end]
| alias FNAME FNAME
| undef (FNAME | SYMBOL)+
| STMT if EXPR
| STMT while EXPR
| STMT unless EXPR
| STMT until EXPR
| STMT rescue STMT
| `BEGIN' `{' COMPSTMT `}'
| `END' `{' COMPSTMT `}'
| EXPR
EXPR : MLHS `=' MRHS
| return CALL_ARGS
| EXPR and EXPR
| EXPR or EXPR
| not EXPR
| COMMAND
| `!' COMMAND
| ARG
CALL : FUNCTION
| COMMAND
COMMAND : OPERATION CALL_ARGS
| PRIMARY `.' FNAME CALL_ARGS
| PRIMARY `::' FNAME CALL_ARGS
| super CALL_ARGS
| yield CALL_ARGS
FUNCTION : OPERATION [`(' [CALL_ARGS] `)']
| PRIMARY `.' FNAME `(' [CALL_ARGS] `)'
| PRIMARY `::' FNAME `(' [CALL_ARGS] `)'
| PRIMARY `.' FNAME
| PRIMARY `::' FNAME
| super [`(' [CALL_ARGS] `)']
ARG : LHS `=' ARG
| LHS OP_ASGN ARG
| ARG `..' ARG
| ARG `...' ARG
| ARG `+' ARG
| ARG `-' ARG
| ARG `*' ARG
| ARG `/' ARG
| ARG `%' ARG
| ARG `**' ARG
| `+' ARG
| `-' ARG
| ARG `|' ARG
| ARG `^' ARG
| ARG `&' ARG
| ARG `<=>' ARG
| ARG `>' ARG
| ARG `>=' ARG
| ARG `<' ARG
| ARG `<=' ARG
| ARG `==' ARG
| ARG `===' ARG
| ARG `!=' ARG
| ARG `=~' ARG
| ARG `!~' ARG
| `!' ARG
| `~' ARG
| ARG `<<' ARG
| ARG `>>' ARG
| ARG `&&' ARG
| ARG `||' ARG
| defined? ARG
| PRIMARY
PRIMARY : `(' COMPSTMT `)'
| LITERAL
| VARIABLE
| PRIMARY `::' identifier
| `::' identifier
| PRIMARY `[' [ARGS] `]'
| `[' [ARGS [`,']] `]'
| `{' [(ARGS|ASSOCS) [`,']] `}'
| return [`(' [CALL_ARGS] `)']
| yield [`(' [CALL_ARGS] `)']
| defined? `(' ARG `)'
| FUNCTION
| FUNCTION `{' [`|' [BLOCK_VAR] `|'] COMPSTMT `}'
| if EXPR THEN
COMPSTMT
(elsif EXPR THEN COMPSTMT)*
[else COMPSTMT]
end
| unless EXPR THEN
COMPSTMT
[else COMPSTMT]
end
| while EXPR DO COMPSTMT end
| until EXPR DO COMPSTMT end
| case [EXPR]
(when WHEN_ARGS THEN COMPSTMT)+
[else COMPSTMT]
end
| for BLOCK_VAR in EXPR DO
COMPSTMT
end
| begin
COMPSTMT
[rescue [ARGS] [`=>' LHS] THEN COMPSTMT]+
[else COMPSTMT]
[ensure COMPSTMT]
end
| class identifier [`<' identifier]
COMPSTMT
end
| module identifier
COMPSTMT
end
| def FNAME ARGDECL
COMPSTMT
[rescue [ARGS] [`=>' LHS] THEN COMPSTMT]+
[else COMPSTMT]
[ensure COMPSTMT]
end
| def SINGLETON (`.'|`::') FNAME ARGDECL
COMPSTMT
end
WHEN_ARGS : ARGS [`,' `*' ARG]
| `*' ARG
THEN : TERM
| then
| TERM then
DO : TERM
| do
| TERM do
BLOCK_VAR : LHS
| MLHS
MLHS : MLHS_ITEM `,' MLHS_ITEM [(`,' MLHS_ITEM)*] [`,' `*' [LHS]]
| MLHS_ITEM `,' `*' [LHS]
| MLHS_ITEM [(`,' MLHS_ITEM)*] `,'
| `*' [LHS]
| `(' MLHS `)'
MLHS_ITEM : LHS
| '(' MLHS ')'
LHS : VARNAME
| PRIMARY `[' [ARGS] `]'
| PRIMARY `.' identifier
MRHS : ARGS [`,' `*' ARG]
| `*' ARG
CALL_ARGS : ARGS
| ARGS [`,' ASSOCS] [`,' `*' ARG] [`,' `&' ARG]
| ASSOCS [`,' `*' ARG] [`,' `&' ARG]
| `*' ARG [`,' `&' ARG]
| `&' ARG
| COMMAND
ARGS : ARG (`,' ARG)*
ARGDECL : `(' ARGLIST `)'
| ARGLIST TERM
ARGLIST : identifier(`,'identifier)*[`,'`*'[identifier]][`,'`&'identifier]
| `*'identifier[`,'`&'identifier]
| [`&'identifier]
SINGLETON : VARNAME
| self
| nil
| true
| false
| `(' EXPR `)'
ASSOCS : ASSOC (`,' ASSOC)*
ASSOC : ARG `=>' ARG
VARIABLE : VARNAME
| self
| nil
| true
| false
| __FILE__
| __LINE__
LITERAL : numeric
| SYMBOL
| STRING
| HERE_DOC
| WORDS
| REGEXP
STRING : LITERAL_STRING+
TERM : `;'
| `\n'
</pre>
<p>
以下のものは字句解析機で解釈されます。
</p>
<pre>
OP_ASGN : `+=' | `-=' | `*=' | `/=' | `%=' | `**='
| `&=' | `|=' | `^=' | `<<=' | `>>='
| `&&=' | `||='
SYMBOL : `:'FNAME
| `:'`@'identifier
| `:'`@@'identifier
| `:'GLOBAL
FNAME : OPERATION
| `|' | `^' | `&' | `<=>' | `==' | `===' | `=~'
| `>' | `>=' | `<' | `<='
| `+' | `-' | `*' | `/' | `%' | `**'
| `<<' | `>>' | `~' | ``'
| `+@' | `-@' | `[]' | `[]='
| __LINE__ | __FILE__ | BEGIN | END
| alias | and | begin | break | case | class | def
| defined | do | else | elsif | end | ensure | false
| for | if | in | module | next | nil | not
| or | redo | rescue | retry | return | self | super
| then | true | undef | unless | until | when
| while | yield
OPERATION : identifier
| identifier'!'
| identifier'?'
VARNAME : GLOBAL
| `@'identifier
| `@@'identifier
| identifier
GLOBAL : `$'identifier
| `$'any_char
| `$''-'any_char
LITERAL_STRING : `"' any_char* `"'
| `'' any_char* `''
| ``' any_char* ``'
| `%'(`Q'|`q'|`x')char any_char* char
HERE_DOC : `<<'(identifier|STRING)
any_char*
identifier
| `<<-'(identifier|STRING)
any_char*
space* identifier
WORDS : `%'`w'char any_char* char
REGEXP : `/' any_char* `/'[`i'|`m'|`x'|`o'|`e'|`s'|`u'|`n']
| `%'`r' char any_char* char
</pre>
<div id="footer">
<a rel="license" href="http://creativecommons.org/licenses/by/3.0/">
<img alt="Creative Commons License" style="border-width:0" src="http://i.creativecommons.org/l/by/3.0/88x31.png" />
</a>
</div>
</body>
</html>