forked from bulletphysics/bullet3
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathlcpp.lua
939 lines (838 loc) · 27.5 KB
/
lcpp.lua
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
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
----------------------------------------------------------------------------
--## lcpp - a C-PreProcessor in Lua 5.1 for LuaJIT ffi
--
-- Copyright (C) 2012-2013 Michael Schmoock <[email protected]>
--
--### Links
-- * GitHub page: [http://github.com/willsteel/lcpp](http://github.com/willsteel/lcpp)
-- * Project page: [http://lcpp.schmoock.net](http://lcpp.schmoock.net)
-- * Lua: [http://www.lua.org](http://www.lua.org)
-- * LuaJIT: [http://luajit.org](http://luajit.org)
-- * Sponsored by: [http://mmbbq.org](http://mmbbq.org)
--
-- It can be used to pre-process LuaJIT ffi C header file input.
-- It can also be used to preprocess any other code (i.e. Lua itself)
--
-- git clone https://github.com/willsteel/lcpp.git
----------------------------------------------------------------------------
--## USAGE
-- -- load lcpp
-- local lcpp = require("lcpp")
--
-- -- use LuaJIT ffi and lcpp to parse cpp code
-- ffi.cdef("#include <your_header.h>")
--
-- -- compile some input
-- local out = lcpp.compile([[
-- #include "myheader.h"
-- #define MAXPATH 260
-- typedef struct somestruct_t {
-- void* base;
-- size_t size;
-- wchar_t path[MAXPATH];
-- } t_exe;
-- ]])
--
-- -- the result should be
-- out = [[
-- // <preprocessed content of file "myheader.h">
-- typedef struct somestruct_t {
-- void* base;
-- size_t size;
-- wchar_t path[260];
-- } t_exe;
-- ]]
--
--## This CPPs BNF:
-- RULES:
-- CODE := {LINE}
-- LINE := {STUFF NEWML} STUFF NEWL
-- STUFF := DIRECTIVE | IGNORED_CONTENT
-- DIRECTIVE := OPTSPACES CMD OPTSPACES DIRECTIVE_NAME WHITESPACES DIRECTIVE_CONTENT WHITESPACES NEWL
--
-- LEAVES:
-- NEWL := "\n"
-- NEWL_ESC := "\\n"
-- WHITESPACES := "[ \t]+"
-- OPTSPACES := "[ \t]*"
-- COMMENT := "//(.-)$"
-- MLCOMMENT := "/[*](.-)[*]/"
-- IGNORED_CONTENT := "[^#].*"
-- CMD := "#"
-- DIRECTIVE_NAME := "include"|"define"|"undef"|"if"|"else"|"elif"|"else if"|"endif"|"ifdef"|"ifndef"|"pragma"|"version"
-- DIRECTIVE_CONTENT := ".*?"
--
--## TODOs:
-- - lcpp.LCPP_LUA for: load, loadfile
-- - "#" operator for stringification
-- - literal concatenation: "foo" "bar" -> "foobar"
--
--## License (MIT)
-- -----------------------------------------------------------------------------
-- Permission is hereby granted, free of charge, to any person obtaining a copy
-- of this software and associated documentation files (the "Software"), to deal
-- in the Software without restriction, including without limitation the rights
-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-- copies of the Software, and to permit persons to whom the Software is
-- furnished to do so, subject to the following conditions:
--
-- The above copyright notice and this permission notice shall be included in
-- all copies or substantial portions of the Software.
--
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-- THE SOFTWARE.
--
-- MIT license: http://www.opensource.org/licenses/mit-license.php
-- -----------------------------------------------------------------------------
--
-- @module lcpp
local lcpp = {}
-- CONFIG
lcpp.LCPP_LUA = false -- whether to use lcpp to preprocess Lua code (load, loadfile, loadstring...)
lcpp.LCPP_FFI = true -- whether to use lcpp as LuaJIT ffi PreProcessor (if used in luaJIT)
lcpp.LCPP_TEST = false -- whether to run lcpp unit tests when loading lcpp module
lcpp.ENV = {} -- static predefines (env-like)
lcpp.FAST = true -- perf. tweaks when enabled. con: breaks minor stuff like __LINE__ macros
lcpp.DEBUG = false
-- PREDEFINES
local __FILE__ = "__FILE__"
local __LINE__ = "__LINE__"
local __DATE__ = "__DATE__"
local __TIME__ = "__TIME__"
local __LCPP_INDENT__ = "__LCPP_INDENT__"
local __LCPP_INSIDE_HEADERFILE__ = "__LCPP_INSIDE_HEADERFILE__"
-- BNF LEAVES
local ENDL = "$"
local STARTL = "^"
local NEWL = "\n"
local NEWL_BYTE = NEWL:byte(1)
local NEWL_ESC = "\\"
local NEWML = "\\\n"
local CMD = "#"
local CMD_BYTE = CMD:byte(1)
local COMMENT = "^(.-)//.-$"
local MLCOMMENT = "/[*].-[*]/"
local WHITESPACES = "%s+"
local OPTSPACES = "%s*"
local IDENTIFIER = "[_%a][_%w]*"
local NOIDENTIFIER = "[^%w_]+"
local FILENAME = "[0-9a-zA-Z.-_/\\]+"
local TEXT = ".+"
-- BNF WORDS
local _INCLUDE = "include"
local _DEFINE = "define"
local _IFDEF = "ifdef"
local _IFNDEF = "ifndef"
local _ENDIF = "endif"
local _UNDEF = "undef"
local _IF = "if"
local _ELSE = "else"
local _ELIF = "elif"
local _NOT = "!"
local _ERROR = "error"
local _PRAGMA = "pragma"
local _VERSION = "version"
-- BNF RULES
local INCLUDE = STARTL.._INCLUDE..WHITESPACES.."[\"<]("..FILENAME..")[\">]"..OPTSPACES..ENDL
local DEFINE = STARTL.._DEFINE
local IFDEF = STARTL.._IFDEF..WHITESPACES.."("..IDENTIFIER..")"..OPTSPACES..ENDL
local IFNDEF = STARTL.._IFNDEF..WHITESPACES.."("..IDENTIFIER..")"..OPTSPACES..ENDL
local ENDIF = STARTL.._ENDIF..OPTSPACES.."(.*)"..ENDL
local UNDEF = STARTL.._UNDEF..WHITESPACES.."("..IDENTIFIER..")"..OPTSPACES..ENDL
local IF = STARTL.._IF..WHITESPACES.."(.*)"..ENDL
local ELSE = STARTL.._ELSE..OPTSPACES.."(.*)"..ENDL
local ELIF = STARTL.._ELIF..WHITESPACES.."(.*)"..ENDL
local ELSEIF = STARTL.._ELSE..WHITESPACES.._IF..WHITESPACES.."(.*)"..ENDL
local ERROR = STARTL.._ERROR..WHITESPACES.."("..TEXT..")"..OPTSPACES..ENDL
local ERROR_NOTEXT = STARTL.._ERROR..OPTSPACES..ENDL --> not required when we have POSIX regex
local PRAGMA = STARTL.._PRAGMA
local VERSION = STARTL.._VERSION
-- speedups
local TRUEMACRO = STARTL.."("..IDENTIFIER..")%s*$"
local REPLMACRO = STARTL.."("..IDENTIFIER..")"..WHITESPACES.."(.+)$"
local FUNCMACRO = STARTL.."("..IDENTIFIER..")%s*%(([%s%w,]*)%)%s*(.*)"
-- ------------
-- LOCAL UTILS
-- ------------
lcpp.STATE = {lineno = 0} -- current state for debugging the last operation
local function error(msg) _G.print(debug.traceback()); _G.error(string.format("lcpp ERR [%04i] %s", lcpp.STATE.lineno, msg)) end
local function print(msg) _G.print(string.format("lcpp INF [%04i] %s", lcpp.STATE.lineno, msg)) end
-- splits a string using a pattern into a table of substrings
local function gsplit(str, pat)
local function _split(str, pat)
local t = {} -- NOTE: use {n = 0} in Lua-5.0
local fpat = "(.-)"..pat
local last_end = 1
local s, e, cap = str:find(fpat, 1)
while s do
if s ~= 1 or cap ~= "" then
coroutine.yield(cap)
end
last_end = e + 1
s, e, cap = str:find(fpat, last_end)
end
if last_end <= #str then
cap = str:sub(last_end)
coroutine.yield(cap)
end
end
return coroutine.wrap(function() _split(str, pat) end)
end
local function split(str, pat)
local t = {}
for str in gsplit(str, pat) do table.insert(t, str) end
return t
end
-- Checks whether a string starts with a given substring
-- offset is optional
local function strsw(str, pat, offset)
if not str then return false end
if not offset then offset = 0 end
return string.sub(str, 1+offset, string.len(pat)+offset) == pat
end
-- Checks whether a string ends with a given substring
local function strew(str, pat)
if not str then return false end
return pat=='' or string.sub(str,-string.len(pat)) == pat
end
-- string trim12 from lua wiki
local function trim(str)
local from = str:match"^%s*()"
return from > #str and "" or str:match(".*%S", from)
end
-- returns the number of string occurrences
local function findn(input, what)
local count = 0
local offset = 0
while true do
_, offset = string.find(input, what, offset+1, true)
if not offset then return count end
count = count + 1
end
end
-- a lightweight and flexible tokenizer
local function _tokenizer(str, setup)
local defsetup = {
-- EXAMPLE patterns have to be pretended with "^" for the tokenizer
["identifier"] = '^[_%a][_%w]*',
["number"] = '^[%+%-]?%d+[%.]?%d*',
["ignore"] = '^%s+',
["string"] = true,
["keywords"] = {
-- ["NAME"] = '^pattern',
-- ...
},
}
if not setup then
setup = defsetup
end
setup.identifier = setup.identifier or defsetup.identifier
setup.number = setup.number or defsetup.number
setup.ignore = setup.number or defsetup.ignore
if nil == setup.string then setup.string = true end
setup.keywords = setup.keywords or {}
local strlen = #str
local i = 1
local i1, i2
local keyword
local function find(pat)
i1, i2 = str:find(pat,i)
return i1 ~= nil
end
local function cut()
return str:sub(i, i2)
end
local function findKeyword()
for name, pat in pairs(setup.keywords) do
local result = find(pat)
if result then
keyword = name
return true
end
end
end
while true do
if i > strlen then return 'eof', nil, strlen, strlen end
if find(setup.ignore) then
coroutine.yield("ignore", cut(), i1, i2)
elseif findKeyword() then
coroutine.yield(keyword, cut(), i1, i2)
elseif find(setup.number) then
coroutine.yield('number', tonumber(cut()), i1, i2)
elseif find(setup.identifier) then
coroutine.yield('identifier', cut(), i1, i2)
elseif setup.string and (find('^"[^"]*"') or find("^'[^']*'")) then
-- strip the quotes
coroutine.yield('string', cut():sub(2,-2), i1, i2)
else -- any other unknown character
i1 = i
i2 = i
coroutine.yield('unknown', cut(), i1, i2)
end
i = i2+1
end
end
local function tokenizer(str, setup)
return coroutine.wrap(function() _tokenizer(str, setup) end)
end
-- ------------
-- PARSER
-- ------------
-- hint: LuaJIT ffi does not rely on us to remove the comments, but maybe other usecases
local function removeComments(input)
input = string.gsub(input, "//.-\n", "\n") -- remove sl comments
-- remove multiline comments in a way that it does not break __LINE__ macro
if lcpp.FAST then
input = string.gsub(input, "/%*.-%*/", "") -- remove ml comments (stupid method)
else
local offset = 0
local output = {}
local starti, endi, match, lastendi
while offset do
starti, endi, match = input:find("/%*(.-)%*/", offset, false)
if starti then
lastendi = endi
local newlineCount = findn(match, "\n")
local newlines = string.rep("\n", newlineCount)
table.insert(output, input:sub(offset+1, starti-1))
table.insert(output, newlines)
offset = endi
else
offset = nil
table.insert(output, input:sub((lastendi or 0) + 1))
end
end
input = table.concat(output)
--error(input)
end
return input
end
-- screener: revmoce comments, trim, ml concat...
-- it only splits to cpp input lines and removes comments. it does not tokenize.
local function screener(input)
local function _screener(input)
--input = removeComments(input)
-- concat mulit-line input.
local count = 1
while count > 0 do input, count = string.gsub(input, "^(.-)\\\n(.-)$", "%1 %2\n") end
-- trim and join blocks not starting with "#"
local buffer = {}
for line in gsplit(input, NEWL) do
--line = trim(line)
if #line > 0 then
if line:byte(1) == CMD_BYTE then
--line = line:gsub("#%s*(.*)", "#%1") -- remove optinal whitespaces after "#". reduce triming later.
if #buffer > 0 then
coroutine.yield(table.concat(buffer, NEWL))
buffer = {}
end
coroutine.yield(line)
else
if lcpp.FAST then
table.insert(buffer, line)
else
coroutine.yield(line)
end
end
elseif not lcpp.FAST then
coroutine.yield(line)
end
end
if #buffer > 0 then
coroutine.yield(table.concat(buffer, NEWL))
end
end
return coroutine.wrap(function() _screener(input) end)
end
-- apply currently known macros to input (and returns it)
local function apply(state, input)
local out = {}
local functions = {}
for k, v, start, end_ in tokenizer(input) do
if k == "identifier" then
local repl = v
local macro = state.defines[v]
if macro then
if type(macro) == "boolean" then
repl = ""
elseif type(macro) == "string" then
repl = macro
elseif type(macro) == "number" then
repl = tostring(macro)
elseif type(macro) == "function" then
table.insert(functions, macro) -- we apply functions in a later step
end
end
table.insert(out, repl)
else
table.insert(out, input:sub(start, end_))
end
end
input = table.concat(out)
for _, func in pairs(functions) do -- TODO: looks sucky (but works quite nice)
input = func(input)
end
return input
end
-- processes an input line. called from lcpp doWork loop
local function processLine(state, line)
if not line or #line == 0 then return line end
local cmd = nil
if line:byte(1) == CMD_BYTE then cmd = line:sub(2) end
--print("processLine(): "..line)
--[[ SKIPPING ]]--
if state:skip() then return end
--[[ READ NEW DIRECTIVES ]]--
if cmd then
-- handle #include ...
local filename = cmd:match(INCLUDE)
if filename then
print("processing header " .. filename)
return state:includeFile(filename)
end
return line
end
--[[ APPLY MACROS ]]--
--line = state:apply(line);
return line
end
local function processLine2(state, line)
if not line or #line == 0 then return line end
local cmd = nil
if line:byte(1) == CMD_BYTE then cmd = line:sub(2) end
--print("processLine(): "..line)
if state:defined(__LCPP_INSIDE_HEADERFILE__) then
--[[ IF/THEN/ELSE STRUCTURAL BLOCKS ]]--
if cmd then
local ifdef = cmd:match(IFDEF)
local ifexp = cmd:match(IF)
local ifndef = cmd:match(IFNDEF)
local elif = cmd:match(ELIF)
local elseif_ = cmd:match(ELSEIF)
local else_ = cmd:match(ELSE)
local endif = cmd:match(ENDIF)
local struct = ifdef or ifexp or ifndef or elif or elseif_ or else_ or endif
if struct then
if ifdef then state:openBlock(state:defined(ifdef)) end
if ifexp then state:openBlock(state:parseExpr(ifexp)) end
if ifndef then state:openBlock(not state:defined(ifndef)) end
if elif then state:elseBlock(state:parseExpr(elif)) end
if elseif_ then state:elseBlock(state:parseExpr(elseif_)) end
if else_ then state:elseBlock(true) end
if endif then state:closeBlock() end
return line
end
end
end
--[[ SKIPPING ]]--
if state:skip() then return end
--[[ READ NEW DIRECTIVES ]]--
if cmd then
-- handle #include ...
local filename = cmd:match(INCLUDE)
if filename then
print("processing header " .. filename)
return state:includeFile(filename)
end
if state:defined(__LCPP_INSIDE_HEADERFILE__) then
-- handle #undef ...
local key = cmd:match(UNDEF)
if type(key) == "string" then
state:undefine(key)
return
end
-- read "#define >FooBar...<" directives
if cmd:match(DEFINE) then
local define = trim(cmd:sub(DEFINE:len()+1))
local macroname, replacement
-- simple "true" defines
macroname = define:match(TRUEMACRO)
if macroname then
state:define(macroname, true)
end
-- replace macro defines
macroname, replacement = define:match(REPLMACRO)
if macroname and replacement then
state:define(macroname, replacement)
end
-- read functional macros
macroname, replacement = state:parseFunction(define)
if macroname and replacement then
state:define(macroname, replacement)
end
return line
end
-- ignore, because we dont have any pragma directives yet
if cmd:match(PRAGMA) then
return line
end
-- abort on unknown keywords
error("unknown directive: "..line)
else
return line
end
end
--[[ APPLY MACROS ]]--
--line = state:apply(line);
return line
end
local function doWork(state)
local function _doWork(state)
if not state:defined(__FILE__) then state:define(__FILE__, "<USER_CHUNK>", true) end
local oldIndent = state:getIndent()
while true do
local input = state:getLine()
if not input then break end
local output = processLine(state, input)
if not lcpp.FAST and not output then
output = "" end -- output empty skipped lines
if lcpp.DEBUG then output = output.." -- "..input end -- input as comment when DEBUG
if output then coroutine.yield(output) end
end
if (oldIndent ~= state:getIndent()) then error("indentation level must be balanced within a file. was:"..oldIndent.." is:"..state:getIndent()) end
end
return coroutine.wrap(function() _doWork(state) end)
end
local function doWork2(state)
local function _doWork2(state)
if not state:defined(__FILE__) then state:define(__FILE__, "<USER_CHUNK>", true) end
local oldIndent = state:getIndent()
while true do
local input = state:getLine()
if not input then break end
local output = processLine2(state, input)
if not lcpp.FAST and not output then output = "" end -- output empty skipped lines
if lcpp.DEBUG then output = output.." -- "..input end -- input as comment when DEBUG
if output then coroutine.yield(output) end
end
if (oldIndent ~= state:getIndent()) then error("indentation level must be balanced within a file. was:"..oldIndent.." is:"..state:getIndent()) end
end
return coroutine.wrap(function() _doWork2(state) end)
end
local function includeFile(state, filename)
local result, result_state = lcpp.compileHeaderFile("../src/" .. filename, state.defines)
-- now, we take the define table of the sub file for further processing
state.defines = result_state.defines
-- and return the compiled result
return result
end
-- sets a global define
local function define(state, key, value, override)
--print("define:"..key.." type:"..type(value))
--if value and not override and state:defined(key) then error("already defined: "..key) end
value = state:prepareMacro(value)
state.defines[key] = value
end
-- parses CPP exressions
-- i.e.: #if !defined(_UNICODE) && !defined(UNICODE)
--
--BNF:
-- EXPR -> (BRACKET_OPEN)(EXPR)(BRACKET_CLOSE)
-- EXPR -> (EXPR)(OR)(EXPR)
-- EXPR -> (EXPR)(AND)(EXPR)
-- EXPR -> (NOT)(EXPR)
-- EXPR -> (FUNCTION)
-- FUNCTION -> (IDENTIFIER)(BRACKET_OPEN)(ARGS)(BRACKET_CLOSE)
-- ARGS -> ((IDENTIFIER)[(COMMA)(IDENTIFIER)])?
--LEAVES:
-- IGNORE -> " \t"
-- BRACKET_OPEN -> "("
-- BRACKET_CLOSE -> ")"
-- OR -> "||"
-- AND -> "&&"
-- NOT -> "!"
-- IDENTIFIER -> "[0-9a-zA-Z_]"
--
local LCPP_TOKENIZE_MACRO = {
string = true,
keywords = {
CONCAT = "^##",
},
}
local LCPP_TOKENIZE_EXPR = {
string = false,
keywords = {
NOT = '^!',
DEFINED = '^defined',
BROPEN = '^[(]',
BRCLOSE = '^[)]',
AND = '^&&',
OR = '^||',
},
}
local function parseDefined(state, input)
local result = false
local bropen = false
local brclose = false
local ident = nil
for key, value in input do
if key == "BROPEN" then
bropen = true
end
if key == "identifier" then
ident = value
if not bropen then break end
end
if key == "BRCLOSE" and ident then
brclose = true
break
end
end
-- wiht and w/o brackets allowed
if ident and ((bropen and brclose) or (not bropen and not brclose)) then
return state:defined(ident)
end
error("expression parse error: defined(ident)")
end
local function parseExpr(state, input)
-- first call gets string input. rest uses tokenizer
if type(input) == "string" then input = tokenizer(input, LCPP_TOKENIZE_EXPR) end
local result = false
local _not = false
for type, value in input do
-- print("type:"..type.." value:"..value)
if type == "NOT" then
_not = true
end
if type == "BROPEN" then
return state:parseExpr(input)
end
if type == "BRCLOSE" then
return result
end
if type == "AND" then
return result and state:parseExpr(input)
end
if type == "OR" then
return result or state:parseExpr(input)
end
if type == "DEFINED" then
if _not then
result = not parseDefined(state, input)
else
result = parseDefined(state, input)
end
end
end
return result
end
-- apply macros chaining and string ops "##" and "#"
local function prepareMacro(state, input)
if type(input) ~= "string" then return input end
input = state:apply(input)
local out = {}
for k, v, start, end_ in tokenizer(input, LCPP_TOKENIZE_MACRO) do
if k == "CONCAT" then
-- remove concat op "##"
else
table.insert(out, input:sub(start, end_))
end
end
return table.concat(out)
end
-- i.e.: "MAX(x, y) (((x) > (y)) ? (x) : (y))"
local function parseFunction(state, input)
if not input then return end
local name, argsstr, repl = input:match(FUNCMACRO)
if not name or not argsstr or not repl then return end
repl = state:prepareMacro(repl)
-- rename args to %1,%2... for later gsub
local noargs = 0
for argname in argsstr:gmatch(IDENTIFIER) do
noargs = noargs + 1
repl = repl:gsub(argname, "%%"..noargs)
end
-- build pattern string: name(arg, arg, ...)
local pattern
if noargs == 0 then pattern = name.."%s*%(%s*%)" -- quick 0 arg version
elseif noargs == 1 then pattern = name.."%s*%(%s*([^,%)]*)%s*%)" -- quick 1 arg version
elseif noargs == 2 then pattern = name.."%s*%(%s*([^,%)]*)%s*,%s*([^,%)]*)%s*%)" -- quick 2 arg version
else -- arbitrary arg version
local buf = {}
table.insert(buf, name)
table.insert(buf, "%s*%(%s*")
for i = 1, noargs do
table.insert(buf, "([^,%)]*)%s*")
if i < noargs then
table.insert(buf, ",%s*")
end
end
table.insert(buf, "%)")
pattern = table.concat(buf)
end
-- build macro funcion
local func = function(input)
return input:gsub(pattern, repl)
end
return name, func
end
-- ------------
-- LCPP INTERFACE
-- ------------
--- initialies a lcpp state. not needed manually. handy for testing
function lcpp.init(input, predefines)
-- create sate var
local state = {} -- init the state object
state.defines = {} -- the table of known defines and replacements
state.screener = screener(input)
state.lineno = 0 -- the current line number
state.stack = {} -- stores wether the current stack level is to be included
state.once = {} -- stack level was once true (first if that evals to true)
-- funcs
state.define = define
state.undefine = function(state, key)
state:define(key, nil)
end
state.defined = function(state, key)
return state.defines[key] ~= nil
end
state.apply = apply
state.includeFile = includeFile
state.doWork = doWork
state.doWork2 = doWork2
state.getIndent = function(state)
return #state.stack
end
state.openBlock = function(state, bool)
state.stack[#state.stack+1] = bool
state.once [#state.once+1] = bool
state:define(__LCPP_INDENT__, state:getIndent(), true)
end
state.elseBlock = function(state, bool)
if state.once[#state.once] then
state.stack[#state.stack] = false
else
state.stack[#state.stack] = bool
if bool then state.once[#state.once] = true end
end
end
state.closeBlock = function(state)
state.stack[#state.stack] = nil
state.once [#state.once] = nil
state:define(__LCPP_INDENT__, state:getIndent(), true)
if state:getIndent() < 0 then error("Unopened block detected. Indentaion problem.") end
end
state.skip = function(state)
for i = 1, #state.stack do
if not state.stack[i] then return true end
end
return false
end
state.getLine = function(state)
state.lineno = state.lineno + 1
state:define(__LINE__, state.lineno, true)
return state.screener()
end
state.prepareMacro = prepareMacro
state.parseExpr = parseExpr
state.parseFunction = parseFunction
-- predefines
state:define(__DATE__, os.date("%B %d %Y"), true)
state:define(__TIME__, os.date("%H:%M:%S"), true)
state:define(__LINE__, state.lineno, true)
state:define(__LCPP_INDENT__, state:getIndent(), true)
predefines = predefines or {}
for k,v in pairs(lcpp.ENV) do state:define(k, v, true) end -- static ones
for k,v in pairs(predefines) do state:define(k, v, true) end
if lcpp.LCPP_TEST then lcpp.STATE = state end -- activate static state debugging
return state
end
--- the preprocessors main function.
-- returns the preprocessed output as a string.
-- @param code data as string
-- @param predefines OPTIONAL a table of predefined variables
-- @usage lcpp.compile("#define bar 0x1337\nstatic const int foo = bar;")
-- @usage lcpp.compile("#define bar 0x1337\nstatic const int foo = bar;", {["bar"] = "0x1338"})
function lcpp.compile(code, predefines)
local state = lcpp.init(code, predefines)
local buf = {}
for output in state:doWork() do
table.insert(buf, output)
end
local output = table.concat(buf, NEWL)
if lcpp.DEBUG then print(output) end
return output, state
end
function lcpp.compile2(code, predefines)
local state = lcpp.init(code, predefines)
state:define(__LCPP_INSIDE_HEADERFILE__,true)
local buf = {}
for output in state:doWork2() do
table.insert(buf, output)
end
local output = table.concat(buf, NEWL)
if lcpp.DEBUG then print(output) end
return output, state
end
--- preprocesses a file
-- @param filename the file to read
-- @param predefines OPTIONAL a table of predefined variables
-- @usage out, state = lcpp.compileFile("../odbg/plugin.h", {["MAXPATH"]=260, ["UNICODE"]=true})
function lcpp.compileFile(filename, predefines)
if not filename then error("processFile() arg1 has to be a string") end
local file = io.open(filename, 'r')
if not file then error("file not found: "..filename) end
local code = file:read('*a')
predefines = predefines or {}
predefines[__FILE__] = filename
return lcpp.compile(code, predefines)
end
function lcpp.compileHeaderFile(filename, predefines)
if not filename then error("processFile() arg1 has to be a string") end
local file = io.open(filename, 'r')
if not file then error("file not found: "..filename) end
local code = file:read('*a')
predefines = predefines or {}
predefines[__FILE__] = filename
return lcpp.compile2(code, predefines)
end
-- ------------
-- REGISTER LCPP
-- ------------
--- disable lcpp processing for ffi, loadstring and such
lcpp.disable = function()
if lcpp.LCPP_LUA then
-- activate LCPP_LUA actually does anything useful
-- _G.loadstring = _G.loadstring_lcpp_backup
end
if lcpp.LCPP_FFI and pcall(require, "ffi") then
ffi = require("ffi")
if ffi.lcpp_cdef_backup then
ffi.cdef = ffi.lcpp_cdef_backup
ffi.lcpp_cdef_backup = nil
end
end
end
--- (re)enable lcpp processing for ffi, loadstring and such
lcpp.enable = function()
-- Use LCPP to process Lua code (load, loadfile, loadstring...)
if lcpp.LCPP_LUA then
-- TODO: make it properly work on all functions
error("lcpp.LCPP_LUA = true -- not properly implemented yet");
_G.loadstring_lcpp_backup = _G.loadstring
_G.loadstring = function(str, chunk)
return loadstring_lcpp_backup(lcpp.compile(str), chunk)
end
end
-- Use LCPP as LuaJIT PreProcessor if used inside LuaJIT. i.e. Hook ffi.cdef
if lcpp.LCPP_FFI and pcall(require, "ffi") then
ffi = require("ffi")
if not ffi.lcpp_cdef_backup then
if not ffi.lcpp_defs then ffi.lcpp_defs = {} end -- defs are stored and reused
ffi.lcpp = function(input)
local output, state = lcpp.compile(input, ffi.lcpp_defs)
ffi.lcpp_defs = state.defines
return output
end
ffi.lcpp_cdef_backup = ffi.cdef
ffi.cdef = function(input) return ffi.lcpp_cdef_backup(ffi.lcpp(input)) end
end
end
end
lcpp.enable()
return lcpp