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
|
%%----------------------------------------------------------------------
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1999-2009. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
%%
%%----------------------------------------------------------------------
%% File : cosNotification_Scanner.erl
%% Purpose : Scan and pre-process a grammar.
%%----------------------------------------------------------------------
-module('cosNotification_Scanner').
-export([scan/1]).
scan(Str) ->
RSL = scan(Str, 1, [], any),
{ok, lists:reverse(RSL)}.
%% Guard macros used at top scan functions only
-define(is_number(X), X >= $0, X =< $9).
-define(is_upper(X), X >= $A, X =< $Z).
-define(is_lower(X), X >= $a, X =< $z).
%%----------------------------------------------------------------------
%% scan
%%
%% A-Z
scan([X|Str], Line, Out, Type) when ?is_upper(X) ->
scan_name(Str, [X], Line, Out, Type);
%% a-z
scan([X|Str], Line, Out, Type) when ?is_lower(X) ->
scan_name(Str, [X], Line, Out, Type);
%% 0-9
scan([X|Str], Line, Out, Type) when ?is_number(X) ->
scan_number(Str, [X], Line, Out, Type);
%% RELOP:s == != <= >= > <
scan([$=,$= | Str], Line, Out, _Type) ->
scan(Str, Line, [{'RELOP', '=='} | Out], any);
scan([$!,$= | Str], Line, Out, _Type) ->
scan(Str, Line, [{'RELOP', '!='} | Out], any);
scan([$<,$= | Str], Line, Out, _Type) ->
scan(Str, Line, [{'RELOP', '<='} | Out], any);
scan([$>,$= | Str], Line, Out, _Type) ->
scan(Str, Line, [{'RELOP', '>='} | Out], any);
scan([$> | Str], Line, Out, _Type) ->
scan(Str, Line, [{'RELOP', '>'} | Out], any);
scan([$< | Str], Line, Out, _Type) ->
scan(Str, Line, [{'RELOP', '<'} | Out], any);
%% ADDOP:s + -
scan([$+ | Str], Line, Out, Type) ->
scan(Str, Line, [{'ADDOP', '+'} | Out], Type);
scan([$- | Str], Line, Out, Type) ->
scan(Str, Line, [{'ADDOP', '-'} | Out], Type);
%% MULOP:s * /
scan([$* | Str], Line, Out, _Type) ->
scan(Str, Line, [{'MULOP', '*'} | Out], any);
scan([$/ | Str], Line, Out, _Type) ->
scan(Str, Line, [{'MULOP', '/'} | Out], any);
%% TAB
scan([9| T], Line, Out, Type) -> scan(T, Line, Out, Type);
%% SP
scan([32| T], Line, Out, Type) -> scan(T, Line, Out, Type);
%% CR
scan([$\r|Str], Line, Out, Type) ->
scan(Str, Line, Out, Type);
%% LF
scan([$\n|Str], Line, Out, Type) ->
scan(Str, Line+1, Out, Type);
%% \\
scan([92, 92 | Str], Line, Out, Type) ->
scan(Str, Line, [{'dbslsh', Line} | Out], Type);
%% \'
scan([92, 39 | Str], Line, Out, Type) ->
scan(Str, Line, [{'bslshd', Line} | Out], Type);
%% '\'
scan([92 | Str], Line, Out, Type) ->
scan(Str, Line, [{'bslsh', Line} | Out], Type);
%% '_'
scan([$_ | Str], Line, Out, dollar) ->
scan_name(Str, [$_], Line, Out, dollar);
%% '$'
scan([$$, 92 | Str], Line, Out, _Type) ->
scan(Str, Line, [{'bslsh', Line}, {'dollar', Line} | Out], dollar);
scan([$$ | Str], Line, Out, _Type) ->
scan(Str, Line, [{'dollar', Line} | Out], dollar);
scan([$"|Str], Line, Out, Type) ->
scan_const(char, Str, [], Line, Out, Type);
scan([$'|Str], Line, Out, Type) ->
scan_const(string, Str, [], Line, Out, Type);
%% Writing '+.<CompDot>' is not allowed ('+' or '-' are only allowed
%% as unary for <UnionVal> (within a component) which must be en integer).
scan([$. | Str], Line, [{'ADDOP', Op}|Out], _) ->
scan_frac(Str, [$.], Line, [{'ADDOP', Op}|Out], any);
%% Must be a <CompDot>
scan([$. | Str], Line, Out, dollar) ->
scan(Str, Line, [{'.',Line} | Out], dollar);
%% Number
scan([$. | Str], Line, Out, Type) ->
scan_frac(Str, [$.], Line, Out, Type);
scan([C|Str], Line, Out, Type) ->
scan(Str, Line, [{list_to_atom([C]), Line} | Out], Type);
scan([], _Line, Out, _Type) ->
Out.
%%----------------------------------------------------------------------
%% scan_name
%%
scan_number([X|Str], Accum, Line, Out, Type) when ?is_number(X) ->
scan_number(Str, [X|Accum], Line, Out, Type);
scan_number([X|Str], Accum, Line, Out, dollar) when X==$. ->
scan(Str, Line, [{'.', Line},
{'int', list_to_integer(lists:reverse(Accum))} | Out], dollar);
scan_number([X|Str], Accum, Line, Out, Type) when X==$. ->
scan_frac(Str, [X|Accum], Line, Out, Type);
scan_number([X|Str], Accum, Line, Out, Type) when X==$e ->
scan_exp(Str, [X|Accum], Line, Out, Type);
scan_number([X|Str], Accum, Line, Out, Type) when X==$E ->
scan_exp(Str, [X|Accum], Line, Out, Type);
scan_number(Str, Accum, Line, Out, Type) ->
scan(Str, Line, [{'int', list_to_integer(lists:reverse(Accum))} | Out], Type).
%% Floating point number scan.
%%
%% Non trivial scan. A float consists of an integral part, a
%% decimal point, a fraction part, an e or E and a signed integer
%% exponent. Either the integer part or the fraction part but not
%% both may be missing, and either the decimal point or the
%% exponent part but not both may be missing. The exponent part
%% must consist of an e or E and a possibly signed exponent.
%%
%% Analysis shows that "1." ".7" "1e2" ".5e-3" "1.7e2" "1.7e-2"
%% is allowed and "1" ".e9" is not. The sign is only allowed just
%% after an e or E. The scanner reads a number as an integer
%% until it encounters a "." so the integer part only error case
%% will not be caught in the scanner (but rather in expression
%% evaluation)
scan_frac([$e | _Str], [$.], _Line, _Out, _Type) ->
{error, "illegal_float"};
scan_frac([$E | _Str], [$.], _Line, _Out, _Type) ->
{error, "illegal_float"};
scan_frac(Str, Accum, Line, Out, Type) ->
scan_frac2(Str, Accum, Line, Out, Type).
scan_frac2([X|Str], Accum, Line, Out, Type) when ?is_number(X) ->
scan_frac2(Str, [X|Accum], Line, Out, Type);
scan_frac2([X|Str], Accum, Line, Out, Type) when X==$e ->
scan_exp(Str, [X|Accum], Line, Out, Type);
scan_frac2([X|Str], Accum, Line, Out, Type) when X==$E ->
scan_exp(Str, [X|Accum], Line, Out, Type);
%% Since '.2' is allowed, we add '0' in front to be sure (erlang do not allow
%% list_to_float(".2") and list_to_float("0.2") eq. list_to_float("00.2")).
scan_frac2(Str, Accum, Line, Out, Type) ->
scan(Str, Line, [{'num', list_to_float([$0|lists:reverse(Accum)])} | Out], Type).
scan_exp([X|Str], Accum, Line, Out, Type) when X==$- ->
scan_exp2(Str, [X|Accum], Line, Out, Type);
scan_exp(Str, Accum, Line, Out, Type) ->
scan_exp2(Str, Accum, Line, Out, Type).
scan_exp2([X|Str], Accum, Line, Out, Type) when ?is_number(X) ->
scan_exp2(Str, [X|Accum], Line, Out, Type);
%% Since '.2' is allowed, we add '0' in front to be sure (erlang do not allow
%% list_to_float(".2")).
scan_exp2(Str, Accum, Line, Out, Type) ->
scan(Str, Line, [{'num', list_to_float([$0|lists:reverse(Accum)])} | Out], Type).
scan_name([X|Str], Accum, Line, Out, Type) when ?is_upper(X) ->
scan_name(Str, [X|Accum], Line, Out, Type);
scan_name([X|Str], Accum, Line, Out, Type) when ?is_lower(X) ->
scan_name(Str, [X|Accum], Line, Out, Type);
scan_name([X|Str], Accum, Line, Out, Type) when ?is_number(X) ->
scan_name(Str, [X|Accum], Line, Out, Type);
scan_name([$_|Str], Accum, Line, Out, dollar) ->
scan_name(Str, [$_|Accum], Line, Out, dollar);
scan_name(S, Accum, Line, [{bslsh,LL} | Out], Type) ->
%% An escaped identifier.
L = lists:reverse(Accum),
scan(S, Line, [{'ident', L}, {bslsh,LL} | Out], Type);
scan_name(S, Accum, Line, Out, Type) ->
L = lists:reverse(Accum),
{X, NewType} = case check_name(L) of
false ->
{{'ident', L}, Type};
_ ->
{{list_to_atom(L), Line}, any}
end,
scan(S, Line, [X | Out], NewType).
%% Shall scan a constant
scan_const(char, [$" | Rest], Accum, Line, Out, Type) ->
scan(Rest, Line,
[{'ident', list_to_atom(lists:reverse(Accum))} | Out], Type);
scan_const(char, [], _Accum, _Line, Out, _Type) -> %% Bad string
% {error, "bad_string"};
Out;
scan_const(string, [$' | Rest], Accum, Line, Out, Type) ->
scan(Rest, Line,
[{'string', lists:reverse(Accum)} | Out], Type);
scan_const(Mode, [$\\, C | Rest], Accum, Line, Out, Type) ->
case escaped_char(C) of
error ->
%% Bad escape character
%% {error, "bad_escape_character"};
scan_const(Mode, Rest, [C | Accum], Line, Out, Type);
EC ->
scan_const(Mode, Rest, [EC | Accum], Line, Out, Type)
end;
scan_const(Mode, [C | Rest], Accum, Line, Out, Type) ->
scan_const(Mode, Rest, [C | Accum], Line, Out, Type).
%% Escaped character. Escaped chars are repr as two characters in the
%% input list of letters and this is translated into one char.
escaped_char($n) -> $\n;
escaped_char($t) -> $\t;
escaped_char($v) -> $\v;
escaped_char($b) -> $\b;
escaped_char($r) -> $ ;
escaped_char($f) -> $\f;
escaped_char($a) -> $\a;
escaped_char($\\) -> $\\;
escaped_char($?) -> $?;
escaped_char($') -> $';
escaped_char($") -> $";
%% Error
escaped_char(_Other) -> error.
check_name("exist") -> true;
check_name("default") -> true;
check_name("_length") -> true;
check_name("_d") -> true;
check_name("_type_id") -> true;
check_name("_repos_id") -> true;
check_name("not") -> true;
check_name("or") -> true;
check_name("and") -> true;
check_name("FALSE") -> true;
check_name("TRUE") -> true;
check_name("in") -> true;
check_name(_) -> false.
|
