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
|
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- G N A T . A R R A Y _ S P L I T --
-- --
-- B o d y --
-- --
-- Copyright (C) 2002-2013, 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 3, 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. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
with Ada.Unchecked_Deallocation;
package body GNAT.Array_Split is
procedure Free is
new Ada.Unchecked_Deallocation (Slices_Indexes, Slices_Access);
procedure Free is
new Ada.Unchecked_Deallocation (Separators_Indexes, Indexes_Access);
function Count
(Source : Element_Sequence;
Pattern : Element_Set) return Natural;
-- Returns the number of occurrences of Pattern elements in Source, 0 is
-- returned if no occurrence is found in Source.
------------
-- Adjust --
------------
procedure Adjust (S : in out Slice_Set) is
begin
S.D.Ref_Counter := S.D.Ref_Counter + 1;
end Adjust;
------------
-- Create --
------------
procedure Create
(S : out Slice_Set;
From : Element_Sequence;
Separators : Element_Sequence;
Mode : Separator_Mode := Single)
is
begin
Create (S, From, To_Set (Separators), Mode);
end Create;
------------
-- Create --
------------
procedure Create
(S : out Slice_Set;
From : Element_Sequence;
Separators : Element_Set;
Mode : Separator_Mode := Single)
is
Result : Slice_Set;
begin
Result.D.Source := new Element_Sequence'(From);
Set (Result, Separators, Mode);
S := Result;
end Create;
-----------
-- Count --
-----------
function Count
(Source : Element_Sequence;
Pattern : Element_Set) return Natural
is
C : Natural := 0;
begin
for K in Source'Range loop
if Is_In (Source (K), Pattern) then
C := C + 1;
end if;
end loop;
return C;
end Count;
--------------
-- Finalize --
--------------
procedure Finalize (S : in out Slice_Set) is
procedure Free is
new Ada.Unchecked_Deallocation (Element_Sequence, Element_Access);
procedure Free is
new Ada.Unchecked_Deallocation (Data, Data_Access);
D : Data_Access := S.D;
begin
-- Ensure call is idempotent
S.D := null;
if D /= null then
D.Ref_Counter := D.Ref_Counter - 1;
if D.Ref_Counter = 0 then
Free (D.Source);
Free (D.Indexes);
Free (D.Slices);
Free (D);
end if;
end if;
end Finalize;
----------------
-- Initialize --
----------------
procedure Initialize (S : in out Slice_Set) is
begin
S.D := new Data'(1, null, 0, null, null);
end Initialize;
----------------
-- Separators --
----------------
function Separators
(S : Slice_Set;
Index : Slice_Number) return Slice_Separators
is
begin
if Index > S.D.N_Slice then
raise Index_Error;
elsif Index = 0
or else (Index = 1 and then S.D.N_Slice = 1)
then
-- Whole string, or no separator used
return (Before => Array_End,
After => Array_End);
elsif Index = 1 then
return (Before => Array_End,
After => S.D.Source (S.D.Slices (Index).Stop + 1));
elsif Index = S.D.N_Slice then
return (Before => S.D.Source (S.D.Slices (Index).Start - 1),
After => Array_End);
else
return (Before => S.D.Source (S.D.Slices (Index).Start - 1),
After => S.D.Source (S.D.Slices (Index).Stop + 1));
end if;
end Separators;
----------------
-- Separators --
----------------
function Separators (S : Slice_Set) return Separators_Indexes is
begin
return S.D.Indexes.all;
end Separators;
---------
-- Set --
---------
procedure Set
(S : in out Slice_Set;
Separators : Element_Sequence;
Mode : Separator_Mode := Single)
is
begin
Set (S, To_Set (Separators), Mode);
end Set;
---------
-- Set --
---------
procedure Set
(S : in out Slice_Set;
Separators : Element_Set;
Mode : Separator_Mode := Single)
is
procedure Copy_On_Write (S : in out Slice_Set);
-- Make a copy of S if shared with another variable
-------------------
-- Copy_On_Write --
-------------------
procedure Copy_On_Write (S : in out Slice_Set) is
begin
if S.D.Ref_Counter > 1 then
-- First let's remove our count from the current data
S.D.Ref_Counter := S.D.Ref_Counter - 1;
-- Then duplicate the data
S.D := new Data'(S.D.all);
S.D.Ref_Counter := 1;
if S.D.Source /= null then
S.D.Source := new Element_Sequence'(S.D.Source.all);
S.D.Indexes := null;
S.D.Slices := null;
end if;
else
-- If there is a single reference to this variable, free it now
-- as it will be redefined below.
Free (S.D.Indexes);
Free (S.D.Slices);
end if;
end Copy_On_Write;
Count_Sep : constant Natural := Count (S.D.Source.all, Separators);
J : Positive;
begin
Copy_On_Write (S);
-- Compute all separator's indexes
S.D.Indexes := new Separators_Indexes (1 .. Count_Sep);
J := S.D.Indexes'First;
for K in S.D.Source'Range loop
if Is_In (S.D.Source (K), Separators) then
S.D.Indexes (J) := K;
J := J + 1;
end if;
end loop;
-- Compute slice info for fast slice access
declare
S_Info : Slices_Indexes (1 .. Slice_Number (Count_Sep) + 1);
K : Natural := 1;
Start, Stop : Natural;
begin
S.D.N_Slice := 0;
Start := S.D.Source'First;
Stop := 0;
loop
if K > Count_Sep then
-- No more separators, last slice ends at end of source string
Stop := S.D.Source'Last;
else
Stop := S.D.Indexes (K) - 1;
end if;
-- Add slice to the table
S.D.N_Slice := S.D.N_Slice + 1;
S_Info (S.D.N_Slice) := (Start, Stop);
exit when K > Count_Sep;
case Mode is
when Single =>
-- In this mode just set start to character next to the
-- current separator, advance the separator index.
Start := S.D.Indexes (K) + 1;
K := K + 1;
when Multiple =>
-- In this mode skip separators following each other
loop
Start := S.D.Indexes (K) + 1;
K := K + 1;
exit when K > Count_Sep
or else S.D.Indexes (K) > S.D.Indexes (K - 1) + 1;
end loop;
end case;
end loop;
S.D.Slices := new Slices_Indexes'(S_Info (1 .. S.D.N_Slice));
end;
end Set;
-----------
-- Slice --
-----------
function Slice
(S : Slice_Set;
Index : Slice_Number) return Element_Sequence
is
begin
if Index = 0 then
return S.D.Source.all;
elsif Index > S.D.N_Slice then
raise Index_Error;
else
return
S.D.Source (S.D.Slices (Index).Start .. S.D.Slices (Index).Stop);
end if;
end Slice;
-----------------
-- Slice_Count --
-----------------
function Slice_Count (S : Slice_Set) return Slice_Number is
begin
return S.D.N_Slice;
end Slice_Count;
end GNAT.Array_Split;
|
