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
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
|
------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- A D A . S T R I N G S . W I D E _ W I D E _ S E A R C H --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2005, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 2, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT 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 distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
-- Boston, MA 02110-1301, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
with Ada.Strings.Wide_Wide_Maps; use Ada.Strings.Wide_Wide_Maps;
package body Ada.Strings.Wide_Wide_Search is
-----------------------
-- Local Subprograms --
-----------------------
function Belongs
(Element : Wide_Wide_Character;
Set : Wide_Wide_Maps.Wide_Wide_Character_Set;
Test : Membership) return Boolean;
pragma Inline (Belongs);
-- Determines if the given element is in (Test = Inside) or not in
-- (Test = Outside) the given character set.
-------------
-- Belongs --
-------------
function Belongs
(Element : Wide_Wide_Character;
Set : Wide_Wide_Maps.Wide_Wide_Character_Set;
Test : Membership) return Boolean
is
begin
if Test = Inside then
return Is_In (Element, Set);
else
return not Is_In (Element, Set);
end if;
end Belongs;
-----------
-- Count --
-----------
function Count
(Source : Wide_Wide_String;
Pattern : Wide_Wide_String;
Mapping : Wide_Wide_Maps.Wide_Wide_Character_Mapping :=
Wide_Wide_Maps.Identity)
return Natural
is
N : Natural;
J : Natural;
begin
if Pattern = "" then
raise Pattern_Error;
end if;
-- Handle the case of non-identity mappings by creating a mapped
-- string and making a recursive call using the identity mapping
-- on this mapped string.
if Mapping /= Wide_Wide_Maps.Identity then
declare
Mapped_Source : Wide_Wide_String (Source'Range);
begin
for J in Source'Range loop
Mapped_Source (J) := Value (Mapping, Source (J));
end loop;
return Count (Mapped_Source, Pattern);
end;
end if;
N := 0;
J := Source'First;
while J <= Source'Last - (Pattern'Length - 1) loop
if Source (J .. J + (Pattern'Length - 1)) = Pattern then
N := N + 1;
J := J + Pattern'Length;
else
J := J + 1;
end if;
end loop;
return N;
end Count;
function Count
(Source : Wide_Wide_String;
Pattern : Wide_Wide_String;
Mapping : Wide_Wide_Maps.Wide_Wide_Character_Mapping_Function)
return Natural
is
Mapped_Source : Wide_Wide_String (Source'Range);
begin
for J in Source'Range loop
Mapped_Source (J) := Mapping (Source (J));
end loop;
return Count (Mapped_Source, Pattern);
end Count;
function Count
(Source : Wide_Wide_String;
Set : Wide_Wide_Maps.Wide_Wide_Character_Set) return Natural
is
N : Natural := 0;
begin
for J in Source'Range loop
if Is_In (Source (J), Set) then
N := N + 1;
end if;
end loop;
return N;
end Count;
----------------
-- Find_Token --
----------------
procedure Find_Token
(Source : Wide_Wide_String;
Set : Wide_Wide_Maps.Wide_Wide_Character_Set;
Test : Membership;
First : out Positive;
Last : out Natural)
is
begin
for J in Source'Range loop
if Belongs (Source (J), Set, Test) then
First := J;
for K in J + 1 .. Source'Last loop
if not Belongs (Source (K), Set, Test) then
Last := K - 1;
return;
end if;
end loop;
-- Here if J indexes 1st char of token, and all chars
-- after J are in the token
Last := Source'Last;
return;
end if;
end loop;
-- Here if no token found
First := Source'First;
Last := 0;
end Find_Token;
-----------
-- Index --
-----------
function Index
(Source : Wide_Wide_String;
Pattern : Wide_Wide_String;
Going : Direction := Forward;
Mapping : Wide_Wide_Maps.Wide_Wide_Character_Mapping :=
Wide_Wide_Maps.Identity)
return Natural
is
begin
if Pattern = "" then
raise Pattern_Error;
end if;
-- Handle the case of non-identity mappings by creating a mapped
-- string and making a recursive call using the identity mapping
-- on this mapped string.
if Mapping /= Identity then
declare
Mapped_Source : Wide_Wide_String (Source'Range);
begin
for J in Source'Range loop
Mapped_Source (J) := Value (Mapping, Source (J));
end loop;
return Index (Mapped_Source, Pattern, Going);
end;
end if;
if Going = Forward then
for J in Source'First .. Source'Last - Pattern'Length + 1 loop
if Pattern = Source (J .. J + Pattern'Length - 1) then
return J;
end if;
end loop;
else -- Going = Backward
for J in reverse Source'First .. Source'Last - Pattern'Length + 1 loop
if Pattern = Source (J .. J + Pattern'Length - 1) then
return J;
end if;
end loop;
end if;
-- Fall through if no match found. Note that the loops are skipped
-- completely in the case of the pattern being longer than the source.
return 0;
end Index;
function Index
(Source : Wide_Wide_String;
Pattern : Wide_Wide_String;
Going : Direction := Forward;
Mapping : Wide_Wide_Maps.Wide_Wide_Character_Mapping_Function)
return Natural
is
Mapped_Source : Wide_Wide_String (Source'Range);
begin
for J in Source'Range loop
Mapped_Source (J) := Mapping (Source (J));
end loop;
return Index (Mapped_Source, Pattern, Going);
end Index;
function Index
(Source : Wide_Wide_String;
Set : Wide_Wide_Maps.Wide_Wide_Character_Set;
Test : Membership := Inside;
Going : Direction := Forward) return Natural
is
begin
if Going = Forward then
for J in Source'Range loop
if Belongs (Source (J), Set, Test) then
return J;
end if;
end loop;
else -- Going = Backward
for J in reverse Source'Range loop
if Belongs (Source (J), Set, Test) then
return J;
end if;
end loop;
end if;
-- Fall through if no match
return 0;
end Index;
function Index
(Source : Wide_Wide_String;
Pattern : Wide_Wide_String;
From : Positive;
Going : Direction := Forward;
Mapping : Wide_Wide_Maps.Wide_Wide_Character_Mapping :=
Wide_Wide_Maps.Identity)
return Natural
is
begin
if Going = Forward then
if From < Source'First then
raise Index_Error;
end if;
return
Index (Source (From .. Source'Last), Pattern, Forward, Mapping);
else
if From > Source'Last then
raise Index_Error;
end if;
return
Index (Source (Source'First .. From), Pattern, Backward, Mapping);
end if;
end Index;
function Index
(Source : Wide_Wide_String;
Pattern : Wide_Wide_String;
From : Positive;
Going : Direction := Forward;
Mapping : Wide_Wide_Maps.Wide_Wide_Character_Mapping_Function)
return Natural
is
begin
if Going = Forward then
if From < Source'First then
raise Index_Error;
end if;
return Index
(Source (From .. Source'Last), Pattern, Forward, Mapping);
else
if From > Source'Last then
raise Index_Error;
end if;
return Index
(Source (Source'First .. From), Pattern, Backward, Mapping);
end if;
end Index;
function Index
(Source : Wide_Wide_String;
Set : Wide_Wide_Maps.Wide_Wide_Character_Set;
From : Positive;
Test : Membership := Inside;
Going : Direction := Forward) return Natural
is
begin
if Going = Forward then
if From < Source'First then
raise Index_Error;
end if;
return
Index (Source (From .. Source'Last), Set, Test, Forward);
else
if From > Source'Last then
raise Index_Error;
end if;
return
Index (Source (Source'First .. From), Set, Test, Backward);
end if;
end Index;
---------------------
-- Index_Non_Blank --
---------------------
function Index_Non_Blank
(Source : Wide_Wide_String;
Going : Direction := Forward) return Natural
is
begin
if Going = Forward then
for J in Source'Range loop
if Source (J) /= Wide_Wide_Space then
return J;
end if;
end loop;
else -- Going = Backward
for J in reverse Source'Range loop
if Source (J) /= Wide_Wide_Space then
return J;
end if;
end loop;
end if;
-- Fall through if no match
return 0;
end Index_Non_Blank;
function Index_Non_Blank
(Source : Wide_Wide_String;
From : Positive;
Going : Direction := Forward) return Natural
is
begin
if Going = Forward then
if From < Source'First then
raise Index_Error;
end if;
return
Index_Non_Blank (Source (From .. Source'Last), Forward);
else
if From > Source'Last then
raise Index_Error;
end if;
return
Index_Non_Blank (Source (Source'First .. From), Backward);
end if;
end Index_Non_Blank;
end Ada.Strings.Wide_Wide_Search;
|
