forked from fpc/Lazarus
-
Notifications
You must be signed in to change notification settings - Fork 2
Expand file tree
/
Copy pathcodeatom.pas
More file actions
614 lines (546 loc) · 15.5 KB
/
Copy pathcodeatom.pas
File metadata and controls
614 lines (546 loc) · 15.5 KB
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
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
{
***************************************************************************
* *
* This source is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This code is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* General Public License for more details. *
* *
* A copy of the GNU General Public License is available on the World *
* Wide Web at <http://www.gnu.org/copyleft/gpl.html>. You can also *
* obtain it by writing to the Free Software Foundation, *
* Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1335, USA. *
* *
***************************************************************************
Author: Mattias Gaertner
Abstract:
An Atom is the smallest unit for a parser. Usually a word or a symbol.
An Atom is defined by the Start- and Endposition in the code (TAtomPosition)
An TAtomRing is a ring of TAtomPosition
}
unit CodeAtom;
{$ifdef FPC}{$mode objfpc}{$endif}{$inline on}{$H+}
interface
{$I codetools.inc}
{ $Define CheckAtomRing}
uses
{$IFDEF MEM_CHECK}
MemCheck,
{$ENDIF}
SysUtils,
// Codetools
FileProcs, KeywordFuncLists;
type
TCommonAtomFlag = (
cafNone, // = none of the below
cafSemicolon, cafEqual, cafColon, cafComma, cafPoint,
cafRoundBracketOpen, cafRoundBracketClose,
cafEdgedBracketOpen, cafEdgedBracketClose,
cafAssignment,
cafWord, cafEnd,
cafOtherOperator // = other operator
);
TCommonAtomFlags = set of TCommonAtomFlag;
const
AllCommonAtomWords = [cafWord, cafEnd];
CommonAtomFlagNames: array[TCommonAtomFlag] of shortstring = (
'None',
'Semicolon', 'Equal', 'Colon', 'Comma', 'Point',
'RoundBracketOpen', 'RoundBracketClose',
'EdgedBracketOpen', 'EdgedBracketClose',
'Assignment',
'Word', 'End', 'Operator'
);
type
TAtomPosition = record
StartPos: integer; // first char of Atom
EndPos: integer; // char behind Atom
Flag: TCommonAtomFlag;
end;
PAtomPosition = ^TAtomPosition;
TAtomPositionArray = array of TAtomPosition;
const
StartAtomPosition: TAtomPosition = (StartPos:1; EndPos:1; Flag:cafNone);
CleanAtomPosition: TAtomPosition = (StartPos:0; EndPos:0; Flag:cafNone);
type
{ TAtomRing }
TAtomRing = class
private
FMask: integer;
FSize: integer;
FCur: integer;
FFirst: integer;
FLast: integer;
FItems: {$ifdef FPC}^{$else}array of {$endif}TAtomPosition;
FSrcLen: integer;
// ring of TAtomPosition
procedure SetSize(NewSize: integer);
function IndexToRelativePos(Index: integer): integer;
function RelativeToIndex(RelativePos: integer): integer; inline;
public
function Empty: boolean; inline;
procedure Add(const NewAtom: TAtomPosition); inline;
function GetCurrent(var Atom: TAtomPosition): boolean;
function IsCurrent(const Atom: TAtomPosition): boolean;
function SetCurrent(const Atom: TAtomPosition): boolean;
function HasPrior: boolean; inline;
function GoBack(var Atom: TAtomPosition): boolean;
procedure UndoLastAdd; inline;
procedure AddReverse(const NewAtom: TAtomPosition); inline; // used when reading backwards
function GetPriorAtom: TAtomPosition; inline;
function GetAtomAt(RelativePos:integer): TAtomPosition;
// 0=current=last added
// -1=prior current, added before current ...
// 1=next first undo item, ...
function IndexOf(StartPos: integer; out RelativePos: integer): boolean;
procedure SetIndex(RelativePos: integer);
function PriorCount: integer; inline;
function NextCount: integer; inline;
function HasNext: boolean; inline;
function MoveToNext(var Atom: TAtomPosition): boolean;
property Size: integer read FSize write SetSize; // rounded up to next power of 2
procedure Clear;
procedure ClearCurrent; // clear current and next, keep previous
procedure WriteDebugReport;
procedure ConsistencyCheck;
property SrcLen: integer read FSrcLen write FSrcLen;
constructor Create;
destructor Destroy; override;
function CalcMemSize: PtrUInt;
end;
TAtomList = class
private
FCapacity: integer;
FCount: integer;
FItems: {$ifdef FPC}^{$else}array of {$endif}TAtomPosition;
function GetItems(Index: integer): TAtomPosition;
procedure SetCapacity(const AValue: integer);
procedure SetItems(Index: integer; const AValue: TAtomPosition);
procedure Grow;
public
procedure Add(NewAtom: TAtomPosition);
procedure Clear;
constructor Create;
destructor Destroy; override;
property Capacity: integer read FCapacity write SetCapacity;
property Count: integer read FCount;
property Items[Index: integer]: TAtomPosition read GetItems write SetItems; default;
end;
//-----------------------------------------------------------------------------
// useful functions
function AtomPosition(StartPos, EndPos: integer): TAtomPosition; overload;
function AtomPosition(StartPos, EndPos: integer; Flag: TCommonAtomFlag): TAtomPosition; overload;
function dbgs(const a: TAtomPosition): string; overload;
implementation
{ useful functions }
function AtomPosition(StartPos, EndPos: integer): TAtomPosition;
begin
Result.StartPos:=StartPos;
Result.EndPos:=EndPos;
Result.Flag:=cafNone;
end;
function AtomPosition(StartPos, EndPos: integer; Flag: TCommonAtomFlag
): TAtomPosition;
begin
Result.StartPos:=StartPos;
Result.EndPos:=EndPos;
Result.Flag:=Flag;
end;
function dbgs(const a: TAtomPosition): string;
begin
Result:=CommonAtomFlagNames[a.Flag]+'['+dbgs(a.StartPos)+'-'+dbgs(a.EndPos)+']';
end;
{ TAtomRing }
procedure TAtomRing.SetSize(NewSize: integer);
var i: integer;
begin
Clear;
if NewSize<2 then NewSize:=2;
if NewSize>$FFFFFFF then NewSize:=$FFFFFFF;
i:=0;
while (i<30) and (NewSize>(1 shl i)) do inc(i);
NewSize:=(1 shl i);
if FSize=NewSize then exit;
FSize:=NewSize;
FMask:=FSize-1;
ReAllocMem(FItems,FSize * SizeOf(TAtomPosition));
Clear;
end;
function TAtomRing.IndexToRelativePos(Index: integer): integer;
begin
if FCur<0 then
RaiseCatchableException('IndexToRelativePos');
if FCur>=FFirst then begin
if Index>=FFirst then begin
Result:=Index-FCur;
end else begin
Result:=Index+FSize-FCur;
end;
end else begin
if Index>=FFirst then begin
Result:=Index-FSize-FCur;
end else begin
Result:=Index-FCur;
end;
end;
end;
function TAtomRing.RelativeToIndex(RelativePos: integer): integer;
begin
Result:=(FCur+FSize+RelativePos) and FMask;
end;
function TAtomRing.Empty: boolean;
begin
Result:=FCur>=0;
end;
constructor TAtomRing.Create;
begin
inherited Create;
FItems:=nil;
Size:=16;
end;
destructor TAtomRing.Destroy;
begin
if FItems<>nil then FreeMem(FItems);
inherited Destroy;
end;
function TAtomRing.CalcMemSize: PtrUInt;
begin
Result:=PtrUInt(InstanceSize)
+PtrUInt(FSize)*SizeOf(TAtomPosition);
end;
procedure TAtomRing.Add(const NewAtom: TAtomPosition);
begin
if FCur>=0 then begin
if (FCur=FLast) then begin
FCur:=(FCur+1) and FMask;
FLast:=FCur;
if FFirst=FLast then
FFirst:=(FFirst+1) and FMask;
end else
FCur:=(FCur+1) and FMask;
end else begin
FCur:=0;
FFirst:=0;
FLast:=0;
end;
FItems[FCur]:=NewAtom;
{$IFDEF CheckAtomRing}ConsistencyCheck;{$ENDIF}
end;
function TAtomRing.GetCurrent(var Atom: TAtomPosition): boolean;
begin
if FCur>=0 then begin
Atom:=FItems[FCur];
Result:=true;
end else
Result:=false;
end;
function TAtomRing.IsCurrent(const Atom: TAtomPosition): boolean;
var
p: PAtomPosition;
begin
if FCur<0 then exit(false);
p:=@FItems[FCur];
Result:=(Atom.StartPos=p^.StartPos) and (Atom.EndPos=p^.EndPos)
and (Atom.Flag=p^.Flag);
end;
function TAtomRing.SetCurrent(const Atom: TAtomPosition): boolean;
var
Item: PAtomPosition;
begin
if Atom.StartPos>=Atom.EndPos then begin
Clear;
exit(false);
end;
Result:=true;
if FCur>=0 then begin
if FCur<>FFirst then begin
Item:=@FItems[(FCur+FSize-1) and FMask];
if Item^.EndPos>Atom.StartPos then begin
Clear;
Add(Atom);
exit;
end;
end;
if FCur<>FLast then begin
Item:=@FItems[(FCur+1) and FMask];
if Item^.StartPos<Atom.EndPos then begin
ClearCurrent;
Add(Atom);
exit;
end;
end;
FItems[FCur]:=Atom;
end else begin
Add(Atom);
end;
end;
function TAtomRing.HasPrior: boolean;
begin
Result:=FCur<>FFirst;
end;
function TAtomRing.GoBack(var Atom: TAtomPosition): boolean;
begin
if FCur<>FFirst then begin
FCur:=(FCur+FSize-1) and FMask;
Atom:=FItems[FCur];
Result:=true;
{$IFDEF CheckAtomRing}ConsistencyCheck;{$ENDIF}
end else
Result:=false;
end;
procedure TAtomRing.AddReverse(const NewAtom: TAtomPosition);
begin
if FFirst>=0 then begin
if (FCur=FFirst) then begin
FCur:=(FCur+FSize-1) and FMask;
FFirst:=FCur;
if FFirst=FLast then
FLast:=(FLast+FSize-1) and FMask;
end else
FCur:=(FCur+FSize-1) and FMask;
end else begin
FCur:=0;
FFirst:=0;
FLast:=0;
end;
FItems[FCur]:=NewAtom;
{$IFDEF CheckAtomRing}ConsistencyCheck;{$ENDIF}
end;
procedure TAtomRing.UndoLastAdd;
begin
if FCur<>FFirst then begin
FCur:=(FCur+FSize-1) and FMask;
end else begin
Clear;
end;
{$IFDEF CheckAtomRing}ConsistencyCheck;{$ENDIF}
end;
function TAtomRing.GetPriorAtom: TAtomPosition;
begin
if (FCur<>FFirst) then begin
Result:=FItems[RelativeToIndex(-1)];
exit;
end;
Result:=CleanAtomPosition;
end;
function TAtomRing.GetAtomAt(RelativePos: integer): TAtomPosition;
// 0=current -1=prior current ...
var
i: Integer;
begin
if (FCur>=0) then begin
if RelativePos>=0 then begin
i:=(FLast+FSize-FCur) and FMask;
if RelativePos<=i then begin
Result:=FItems[RelativeToIndex(RelativePos)];
exit;
end;
end else begin
i:=((FCur+FSize-FFirst) and FMask)+1;
if -RelativePos<=i then begin
Result:=FItems[RelativeToIndex(RelativePos)];
exit;
end;
end;
end;
Result:=CleanAtomPosition;
end;
function TAtomRing.IndexOf(StartPos: integer; out RelativePos: integer): boolean;
var
p, l, r, m: Integer;
begin
//writeln('TAtomRing.IndexOf StartPos=',StartPos,' FCur=',FCur,' FFirst=',FFirst,' FLast=',FLast);
if FCur<0 then exit(false);
if FItems[FFirst].StartPos>StartPos then exit(false);
if FItems[FLast].StartPos<StartPos then exit(false);
if FFirst<=FLast then begin
l:=FFirst;
r:=FLast;
end else begin
l:=FFirst;
r:=FLast+FSize;
end;
//writeln('TAtomRing.IndexOf l=',l,' r=',r);
while l<=r do begin
m:=(l+r) shr 1;
p:=FItems[m and FMask].StartPos;
if StartPos>p then
l:=m+1
else if StartPos<p then
r:=m-1
else begin
// found
RelativePos:=IndexToRelativePos(m);
exit(true);
end;
end;
Result:=false;
end;
procedure TAtomRing.SetIndex(RelativePos: integer);
begin
FCur:=(FCur+FSize+RelativePos) and FMask;
{$IFDEF CheckAtomRing}ConsistencyCheck;{$ENDIF}
end;
procedure TAtomRing.Clear;
begin
FFirst:=-1;
FLast:=-1;
FCur:=-1;
{$IFDEF CheckAtomRing}ConsistencyCheck;{$ENDIF}
end;
procedure TAtomRing.ClearCurrent;
begin
if FCur<0 then exit;
if FCur=FFirst then
Clear
else begin
FCur:=(FCur+FSize-1) and FMask;
FLast:=FCur;
end;
{$IFDEF CheckAtomRing}ConsistencyCheck;{$ENDIF}
end;
function TAtomRing.PriorCount: integer;
begin
if FCur>=0 then
Result:=((FCur+FSize-FFirst) and FMask)+1
else
Result:=0;
end;
function TAtomRing.NextCount: integer;
begin
if FCur>=0 then
Result:=(FLast+FSize-FCur) and FMask
else
Result:=0;
end;
function TAtomRing.HasNext: boolean;
begin
Result:=FCur<>FLast;
end;
function TAtomRing.MoveToNext(var Atom: TAtomPosition): boolean;
begin
if FCur<>FLast then begin
FCur:=(FCur+1) and FMask;
Atom:=FItems[FCur];
Result:=true;
{$IFDEF CheckAtomRing}ConsistencyCheck;{$ENDIF}
end else
Result:=false;
end;
procedure TAtomRing.WriteDebugReport;
var i: integer;
p: TAtomPosition;
begin
DebugLn(['[TAtomRing.WriteDebugReport] Size=',FSize
,' Cur=',FCur,' First=',FFirst,' Last=',FLast,' PriorCount=',PriorCount,' NextCount=',NextCount]);
if FCur>=0 then begin
DbgOut('ValuesAt: ');
for i:=1-PriorCount to NextCount do begin
p:=GetAtomAt(i);
DbgOut(' '+dbgs(i)+'='+dbgs(p.StartPos)+'-'+dbgs(p.EndPos));
end;
DebugLn('');
end;
end;
procedure TAtomRing.ConsistencyCheck;
procedure E(Msg: string);
begin
WriteDebugReport;
Msg:='TAtomRing.ConsistencyCheck: '+Msg;
debugln('ERROR: ',Msg);
RaiseCatchableException(Msg);
end;
var
i, Next: Integer;
begin
if FSize<2 then exit;
if FSize<>FMask+1 then E('invalid FMask');
if (FCur<-1) or (FCur>FMask) then E('invalid FCur');
if (FFirst<-1) or (FFirst>FMask) then E('invalid FFirst');
if (FLast<-1) or (FLast>FMask) then E('invalid FLast');
if FCur<0 then begin
if FFirst<>FCur then E('FFirst<>FCur');
if FLast<>FCur then E('FLast<>FCur');
end else begin
if FFirst<0 then E('FFirst<0');
if FLast<0 then E('FLast<0');
if FFirst<=FLast then begin
if FCur<FFirst then E('FCur<FFirst<=FLast');
if FCur>FLast then E('FCur>FLast>=FFirst');
end else begin
if (FCur>FLast) and (FCur<FFirst) then E('FLast<FCur<FFirst');
end;
i:=FFirst;
repeat
if FItems[i].StartPos>=FItems[i].EndPos then begin
if (i=FLast) and (FItems[i].StartPos=FItems[i].EndPos)
and (FItems[i].StartPos>SrcLen) then
// src end
else if (i=FFirst) and (FItems[i].StartPos=FItems[i].EndPos)
and (FItems[i].StartPos<1) then
// src start
else
E('StartPos>=EndPos at '+IntToStr(i));
end;
if i=FLast then break;
Next:=(i+1) and FMask;
if FItems[i].EndPos>FItems[Next].StartPos then E('FItems['+IntToStr(i)+'].EndPos>FItems['+IntToStr(Next)+'].StartPos');
i:=Next;
until false;
end;
end;
{ TAtomList }
function TAtomList.GetItems(Index: integer): TAtomPosition;
begin
Result:=FItems[Index];
end;
procedure TAtomList.SetCapacity(const AValue: integer);
begin
if FCapacity=AValue then exit;
FCapacity:=AValue;
if FItems<>nil then begin
if FCapacity>0 then begin
ReallocMem(FItems,SizeOf(TAtomPosition)*FCapacity);
end else begin
FreeMem(FItems);
FItems:=nil;
end;
end else begin
if FCapacity>0 then
GetMem(FItems,SizeOf(TAtomPosition)*FCapacity);
end;
end;
procedure TAtomList.SetItems(Index: integer; const AValue: TAtomPosition);
begin
FItems[Index]:=AValue;
end;
procedure TAtomList.Grow;
begin
Capacity:=Capacity*2+10;
end;
procedure TAtomList.Add(NewAtom: TAtomPosition);
begin
if FCount=FCapacity then Grow;
inc(FCount);
Items[Count-1]:=NewAtom;
end;
procedure TAtomList.Clear;
begin
FCount:=0;
Capacity:=0;
end;
constructor TAtomList.Create;
begin
inherited Create;
end;
destructor TAtomList.Destroy;
begin
Clear;
inherited Destroy;
end;
end.