summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/tex/luatex/luaotfload/fontloader-l-file.lua
blob: d0af94f09d45d69ea7ede27f652af2dbc1d83feb (plain)
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
if not modules then modules = { } end modules ['l-file'] = {
    version   = 1.001,
    comment   = "companion to luat-lib.mkiv",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

-- needs a cleanup

file       = file or { }
local file = file

if not lfs then
    lfs = optionalrequire("lfs")
end

-- -- see later
--
-- if not lfs then
--
--     lfs = {
--         getcurrentdir = function()
--             return "."
--         end,
--         attributes = function()
--             return nil
--         end,
--         isfile = function(name)
--             local f = io.open(name,'rb')
--             if f then
--                 f:close()
--                 return true
--             end
--         end,
--         isdir = function(name)
--             print("you need to load lfs")
--             return false
--         end
--     }
--
-- elseif not lfs.isfile then
--
--     local attributes = lfs.attributes
--
--     function lfs.isdir(name)
--         return attributes(name,"mode") == "directory"
--     end
--
--     function lfs.isfile(name)
--         return attributes(name,"mode") == "file"
--     end
--
--  -- function lfs.isdir(name)
--  --     local a = attributes(name)
--  --     return a and a.mode == "directory"
--  -- end
--
--  -- function lfs.isfile(name)
--  --     local a = attributes(name)
--  --     return a and a.mode == "file"
--  -- end
--
-- end

local insert, concat = table.insert, table.concat
local match, find, gmatch = string.match, string.find, string.gmatch
local lpegmatch = lpeg.match
local getcurrentdir, attributes = lfs.currentdir, lfs.attributes
local checkedsplit = string.checkedsplit

local P, R, S, C, Cs, Cp, Cc, Ct = lpeg.P, lpeg.R, lpeg.S, lpeg.C, lpeg.Cs, lpeg.Cp, lpeg.Cc, lpeg.Ct

-- better this way:

local attributes = lfs.attributes

function lfs.isdir(name)
    if name then
        return attributes(name,"mode") == "directory"
    end
end

function lfs.isfile(name)
    if name then
        local a = attributes(name,"mode")
        return a == "file" or a == "link" or nil
    end
end

function lfs.isfound(name)
    if name then
        local a = attributes(name,"mode")
        return (a == "file" or a == "link") and name or nil
    end
end

function lfs.modification(name)
    return name and attributes(name,"modification") or nil
end

if sandbox then
    sandbox.redefine(lfs.isfile,"lfs.isfile")
    sandbox.redefine(lfs.isdir, "lfs.isdir")
    sandbox.redefine(lfs.isfound, "lfs.isfound")
end

local colon     = P(":")
local period    = P(".")
local periods   = P("..")
local fwslash   = P("/")
local bwslash   = P("\\")
local slashes   = S("\\/")
local noperiod  = 1-period
local noslashes = 1-slashes
local name      = noperiod^1
local suffix    = period/"" * (1-period-slashes)^1 * -1

----- pattern = C((noslashes^0 * slashes^1)^1)
local pattern = C((1 - (slashes^1 * noslashes^1 * -1))^1) * P(1) -- there must be a more efficient way

local function pathpart(name,default)
    return name and lpegmatch(pattern,name) or default or ""
end

local pattern = (noslashes^0 * slashes)^1 * C(noslashes^1) * -1

local function basename(name)
    return name and lpegmatch(pattern,name) or name
end

-- print(pathpart("file"))
-- print(pathpart("dir/file"))
-- print(pathpart("/dir/file"))
-- print(basename("file"))
-- print(basename("dir/file"))
-- print(basename("/dir/file"))

local pattern = (noslashes^0 * slashes^1)^0 * Cs((1-suffix)^1) * suffix^0

local function nameonly(name)
    return name and lpegmatch(pattern,name) or name
end

local pattern = (noslashes^0 * slashes)^0 * (noperiod^1 * period)^1 * C(noperiod^1) * -1

local function suffixonly(name)
    return name and lpegmatch(pattern,name) or ""
end

local pattern = (noslashes^0 * slashes)^0 * noperiod^1 * ((period * C(noperiod^1))^1) * -1 + Cc("")

local function suffixesonly(name)
    if name then
        return lpegmatch(pattern,name)
    else
        return ""
    end
end

file.pathpart     = pathpart
file.basename     = basename
file.nameonly     = nameonly
file.suffixonly   = suffixonly
file.suffix       = suffixonly
file.suffixesonly = suffixesonly
file.suffixes     = suffixesonly

file.dirname      = pathpart   -- obsolete
file.extname      = suffixonly -- obsolete

-- actually these are schemes

local drive  = C(R("az","AZ")) * colon
local path   = C((noslashes^0 * slashes)^0)
local suffix = period * C(P(1-period)^0 * P(-1))
local base   = C((1-suffix)^0)
local rest   = C(P(1)^0)

drive  = drive  + Cc("")
path   = path   + Cc("")
base   = base   + Cc("")
suffix = suffix + Cc("")

local pattern_a =   drive * path  *   base * suffix
local pattern_b =           path  *   base * suffix
local pattern_c = C(drive * path) * C(base * suffix) -- trick: two extra captures
local pattern_d =           path  *   rest

function file.splitname(str,splitdrive)
    if not str then
        -- error
    elseif splitdrive then
        return lpegmatch(pattern_a,str) -- returns drive, path, base, suffix
    else
        return lpegmatch(pattern_b,str) -- returns path, base, suffix
    end
end

function file.splitbase(str)
    if str then
        return lpegmatch(pattern_d,str) -- returns path, base+suffix (path has / appended, might change at some point)
    else
        return "", str -- assume no path
    end
end

---- stripslash = C((1 - P("/")^1*P(-1))^0)

function file.nametotable(str,splitdrive)
    if str then
        local path, drive, subpath, name, base, suffix = lpegmatch(pattern_c,str)
     -- if path ~= "" then
     --     path = lpegmatch(stripslash,path) -- unfortunate hack, maybe this becomes default
     -- end
        if splitdrive then
            return {
                path    = path,
                drive   = drive,
                subpath = subpath,
                name    = name,
                base    = base,
                suffix  = suffix,
            }
        else
            return {
                path    = path,
                name    = name,
                base    = base,
                suffix  = suffix,
            }
        end
    end
end

-- print(file.splitname("file"))
-- print(file.splitname("dir/file"))
-- print(file.splitname("/dir/file"))
-- print(file.splitname("file"))
-- print(file.splitname("dir/file"))
-- print(file.splitname("/dir/file"))

-- inspect(file.nametotable("file.ext"))
-- inspect(file.nametotable("dir/file.ext"))
-- inspect(file.nametotable("/dir/file.ext"))
-- inspect(file.nametotable("file.ext"))
-- inspect(file.nametotable("dir/file.ext"))
-- inspect(file.nametotable("/dir/file.ext"))

----- pattern = Cs(((period * noperiod^1 * -1) / "" + 1)^1)
local pattern = Cs(((period * (1-period-slashes)^1 * -1) / "" + 1)^1)

function file.removesuffix(name)
    return name and lpegmatch(pattern,name)
end

-- local pattern = (noslashes^0 * slashes)^0 * (noperiod^1 * period)^1 * Cp() * noperiod^1 * -1
--
-- function file.addsuffix(name, suffix)
--     local p = lpegmatch(pattern,name)
--     if p then
--         return name
--     else
--         return name .. "." .. suffix
--     end
-- end

local suffix  = period/"" * (1-period-slashes)^1 * -1
local pattern = Cs((noslashes^0 * slashes^1)^0 * ((1-suffix)^1)) * Cs(suffix)

function file.addsuffix(filename,suffix,criterium)
    if not filename or not suffix or suffix == "" then
        return filename
    elseif criterium == true then
        return filename .. "." .. suffix
    elseif not criterium then
        local n, s = lpegmatch(pattern,filename)
        if not s or s == "" then
            return filename .. "." .. suffix
        else
            return filename
        end
    else
        local n, s = lpegmatch(pattern,filename)
        if s and s ~= "" then
            local t = type(criterium)
            if t == "table" then
                -- keep if in criterium
                for i=1,#criterium do
                    if s == criterium[i] then
                        return filename
                    end
                end
            elseif t == "string" then
                -- keep if criterium
                if s == criterium then
                    return filename
                end
            end
        end
        return (n or filename) .. "." .. suffix
    end
end

-- print("1 " .. file.addsuffix("name","new")                   .. " -> name.new")
-- print("2 " .. file.addsuffix("name.old","new")               .. " -> name.old")
-- print("3 " .. file.addsuffix("name.old","new",true)          .. " -> name.old.new")
-- print("4 " .. file.addsuffix("name.old","new","new")         .. " -> name.new")
-- print("5 " .. file.addsuffix("name.old","new","old")         .. " -> name.old")
-- print("6 " .. file.addsuffix("name.old","new","foo")         .. " -> name.new")
-- print("7 " .. file.addsuffix("name.old","new",{"foo","bar"}) .. " -> name.new")
-- print("8 " .. file.addsuffix("name.old","new",{"old","bar"}) .. " -> name.old")

local suffix  = period * (1-period-slashes)^1 * -1
local pattern = Cs((1-suffix)^0)

function file.replacesuffix(name,suffix)
    if name and suffix and suffix ~= "" then
        return lpegmatch(pattern,name) .. "." .. suffix
    else
        return name
    end
end

--

local reslasher = lpeg.replacer(P("\\"),"/")

function file.reslash(str)
    return str and lpegmatch(reslasher,str)
end

-- We should be able to use:
--
-- local writable = P(1) * P("w") * Cc(true)
--
-- function file.is_writable(name)
--     local a = attributes(name) or attributes(pathpart(name,"."))
--     return a and lpegmatch(writable,a.permissions) or false
-- end
--
-- But after some testing Taco and I came up with the more robust
-- variant:

if lfs.isreadablefile and lfs.iswritablefile then

    file.is_readable = lfs.isreadablefile
    file.is_writable = lfs.iswritablefile

else

    function file.is_writable(name)
        if not name then
            -- error
        elseif lfs.isdir(name) then
            name = name .. "/m_t_x_t_e_s_t.tmp"
            local f = io.open(name,"wb")
            if f then
                f:close()
                os.remove(name)
                return true
            end
        elseif lfs.isfile(name) then
            local f = io.open(name,"ab")
            if f then
                f:close()
                return true
            end
        else
            local f = io.open(name,"ab")
            if f then
                f:close()
                os.remove(name)
                return true
            end
        end
        return false
    end

    local readable = P("r") * Cc(true)

    function file.is_readable(name)
        if name then
            local a = attributes(name)
            return a and lpegmatch(readable,a.permissions) or false
        else
            return false
        end
    end

end

file.isreadable = file.is_readable -- depricated
file.iswritable = file.is_writable -- depricated

function file.size(name)
    if name then
        local a = attributes(name)
        return a and a.size or 0
    else
        return 0
    end
end

function file.splitpath(str,separator) -- string .. reslash is a bonus (we could do a direct split)
    return str and checkedsplit(lpegmatch(reslasher,str),separator or io.pathseparator)
end

function file.joinpath(tab,separator) -- table
    return tab and concat(tab,separator or io.pathseparator) -- can have trailing //
end

local someslash = S("\\/")
local stripper  = Cs(P(fwslash)^0/"" * reslasher)
local isnetwork = someslash * someslash * (1-someslash)
                + (1-fwslash-colon)^1 * colon
local isroot    = fwslash^1 * -1
local hasroot   = fwslash^1

local reslasher = lpeg.replacer(S("\\/"),"/")
local deslasher = lpeg.replacer(S("\\/")^1,"/")

-- If we have a network or prefix then there is a change that we end up with two
-- // in the middle ... we could prevent this if we (1) expand prefixes: and (2)
-- split and rebuild as url. Of course we could assume no network paths (which
-- makes sense) adn assume either mapped drives (windows) or mounts (unix) but
-- then we still have to deal with urls ... anyhow, multiple // are never a real
-- problem but just ugly.

-- function file.join(...)
--     local lst = { ... }
--     local one = lst[1]
--     if lpegmatch(isnetwork,one) then
--         local one = lpegmatch(reslasher,one)
--         local two = lpegmatch(deslasher,concat(lst,"/",2))
--         if lpegmatch(hasroot,two) then
--             return one .. two
--         else
--             return one .. "/" .. two
--         end
--     elseif lpegmatch(isroot,one) then
--         local two = lpegmatch(deslasher,concat(lst,"/",2))
--         if lpegmatch(hasroot,two) then
--             return two
--         else
--             return "/" .. two
--         end
--     elseif one == "" then
--         return lpegmatch(stripper,concat(lst,"/",2))
--     else
--         return lpegmatch(deslasher,concat(lst,"/"))
--     end
-- end

function file.join(one, two, three, ...)
    if not two then
        return one == "" and one or lpegmatch(reslasher,one)
    end
    if one == "" then
        return lpegmatch(stripper,three and concat({ two, three, ... },"/") or two)
    end
    if lpegmatch(isnetwork,one) then
        local one = lpegmatch(reslasher,one)
        local two = lpegmatch(deslasher,three and concat({ two, three, ... },"/") or two)
        if lpegmatch(hasroot,two) then
            return one .. two
        else
            return one .. "/" .. two
        end
    elseif lpegmatch(isroot,one) then
        local two = lpegmatch(deslasher,three and concat({ two, three, ... },"/") or two)
        if lpegmatch(hasroot,two) then
            return two
        else
            return "/" .. two
        end
    else
        return lpegmatch(deslasher,concat({  one, two, three, ... },"/"))
    end
end

-- or we can use this:
--
-- function file.join(...)
--     local n = select("#",...)
--     local one = select(1,...)
--     if n == 1 then
--         return one == "" and one or lpegmatch(stripper,one)
--     end
--     if one == "" then
--         return lpegmatch(stripper,n > 2 and concat({ ... },"/",2) or select(2,...))
--     end
--     if lpegmatch(isnetwork,one) then
--         local one = lpegmatch(reslasher,one)
--         local two = lpegmatch(deslasher,n > 2 and concat({ ... },"/",2) or select(2,...))
--         if lpegmatch(hasroot,two) then
--             return one .. two
--         else
--             return one .. "/" .. two
--         end
--     elseif lpegmatch(isroot,one) then
--         local two = lpegmatch(deslasher,n > 2 and concat({ ... },"/",2) or select(2,...))
--         if lpegmatch(hasroot,two) then
--             return two
--         else
--             return "/" .. two
--         end
--     else
--         return lpegmatch(deslasher,concat({ ... },"/"))
--     end
-- end

-- print(file.join("c:/whatever"))
-- print(file.join("c:/whatever","name"))
-- print(file.join("//","/y"))
-- print(file.join("/","/y"))
-- print(file.join("","/y"))
-- print(file.join("/x/","/y"))
-- print(file.join("x/","/y"))
-- print(file.join("http://","/y"))
-- print(file.join("http://a","/y"))
-- print(file.join("http:///a","/y"))
-- print(file.join("//nas-1","/y"))
-- print(file.join("//nas-1/a/b/c","/y"))
-- print(file.join("\\\\nas-1\\a\\b\\c","\\y"))

-- The previous one fails on "a.b/c"  so Taco came up with a split based
-- variant. After some skyping we got it sort of compatible with the old
-- one. After that the anchoring to currentdir was added in a better way.
-- Of course there are some optimizations too. Finally we had to deal with
-- windows drive prefixes and things like sys://. Eventually gsubs and
-- finds were replaced by lpegs.

local drivespec    = R("az","AZ")^1 * colon
local anchors      = fwslash
                   + drivespec
local untouched    = periods
                   + (1-period)^1 * P(-1)
local mswindrive   = Cs(drivespec * (bwslash/"/" + fwslash)^0)
local mswinuncpath = (bwslash + fwslash) * (bwslash + fwslash) * Cc("//")
local splitstarter = (mswindrive + mswinuncpath + Cc(false))
                   * Ct(lpeg.splitat(S("/\\")^1))
local absolute     = fwslash

function file.collapsepath(str,anchor) -- anchor: false|nil, true, "."
    if not str then
        return
    end
    if anchor == true and not lpegmatch(anchors,str) then
        str = getcurrentdir() .. "/" .. str
    end
    if str == "" or str =="." then
        return "."
    elseif lpegmatch(untouched,str) then
        return lpegmatch(reslasher,str)
    end
    local starter, oldelements = lpegmatch(splitstarter,str)
    local newelements = { }
    local i = #oldelements
    while i > 0 do
        local element = oldelements[i]
        if element == '.' then
            -- do nothing
        elseif element == '..' then
            local n = i - 1
            while n > 0 do
                local element = oldelements[n]
                if element ~= '..' and element ~= '.' then
                    oldelements[n] = '.'
                    break
                else
                    n = n - 1
                end
             end
            if n < 1 then
               insert(newelements,1,'..')
            end
        elseif element ~= "" then
            insert(newelements,1,element)
        end
        i = i - 1
    end
    if #newelements == 0 then
        return starter or "."
    elseif starter then
        return starter .. concat(newelements, '/')
    elseif lpegmatch(absolute,str) then
        return "/" .. concat(newelements,'/')
    else
        newelements = concat(newelements, '/')
        if anchor == "." and find(str,"^%./") then
            return "./" .. newelements
        else
            return newelements
        end
    end
end

-- local function test(str,...)
--    print(string.format("%-20s %-15s %-30s %-20s",str,file.collapsepath(str),file.collapsepath(str,true),file.collapsepath(str,".")))
-- end
-- test("a/b.c/d") test("b.c/d") test("b.c/..")
-- test("/") test("c:/..") test("sys://..")
-- test("") test("./") test(".") test("..") test("./..") test("../..")
-- test("a") test("./a") test("/a") test("a/../..")
-- test("a/./b/..") test("a/aa/../b/bb") test("a/.././././b/..") test("a/./././b/..")
-- test("a/b/c/../..") test("./a/b/c/../..") test("a/b/c/../..")
-- test("./a")
-- test([[\\a.b.c\d\e]])

local validchars = R("az","09","AZ","--","..")
local pattern_a  = lpeg.replacer(1-validchars)
local pattern_a  = Cs((validchars + P(1)/"-")^1)
local whatever   = P("-")^0 / ""
local pattern_b  = Cs(whatever * (1 - whatever * -1)^1)

function file.robustname(str,strict)
    if str then
        str = lpegmatch(pattern_a,str) or str
        if strict then
            return lpegmatch(pattern_b,str) or str -- two step is cleaner (less backtracking)
        else
            return str
        end
    end
end

local loaddata = io.loaddata
local savedata = io.savedata

file.readdata  = loaddata
file.savedata  = savedata

function file.copy(oldname,newname)
    if oldname and newname then
        local data = loaddata(oldname)
        if data and data ~= "" then
            savedata(newname,data)
        end
    end
end

-- also rewrite previous

local letter    = R("az","AZ") + S("_-+")
local separator = P("://")

local qualified = period^0 * fwslash
                + letter   * colon
                + letter^1 * separator
                + letter^1 * fwslash
local rootbased = fwslash
                + letter * colon

lpeg.patterns.qualified = qualified
lpeg.patterns.rootbased = rootbased

-- ./name ../name  /name c: :// name/name

function file.is_qualified_path(filename)
    return filename and lpegmatch(qualified,filename) ~= nil
end

function file.is_rootbased_path(filename)
    return filename and lpegmatch(rootbased,filename) ~= nil
end

-- function test(t) for k, v in next, t do print(v, "=>", file.splitname(v)) end end
--
-- test { "c:", "c:/aa", "c:/aa/bb", "c:/aa/bb/cc", "c:/aa/bb/cc.dd", "c:/aa/bb/cc.dd.ee" }
-- test { "c:", "c:aa", "c:aa/bb", "c:aa/bb/cc", "c:aa/bb/cc.dd", "c:aa/bb/cc.dd.ee" }
-- test { "/aa", "/aa/bb", "/aa/bb/cc", "/aa/bb/cc.dd", "/aa/bb/cc.dd.ee" }
-- test { "aa", "aa/bb", "aa/bb/cc", "aa/bb/cc.dd", "aa/bb/cc.dd.ee" }

-- -- maybe:
--
-- if os.type == "windows" then
--     local currentdir = getcurrentdir
--     function getcurrentdir()
--         return lpegmatch(reslasher,currentdir())
--     end
-- end

-- for myself:

function file.strip(name,dir)
    if name then
        local b, a = match(name,"^(.-)" .. dir .. "(.*)$")
        return a ~= "" and a or name
    end
end

-- local debuglist = {
--     "pathpart", "basename", "nameonly", "suffixonly", "suffix", "dirname", "extname",
--     "addsuffix", "removesuffix", "replacesuffix", "join",
--     "strip","collapsepath", "joinpath", "splitpath",
-- }

-- for i=1,#debuglist do
--     local name = debuglist[i]
--     local f = file[name]
--     file[name] = function(...)
--         print(name,f(...))
--         return f(...)
--     end
-- end

-- a goodie: a dumb version of mkdirs (not used in context itself, only
-- in generic usage)

function lfs.mkdirs(path)
    local full = ""
    for sub in gmatch(path,"(/*[^\\/]+)") do -- accepts leading c: and /
        full = full .. sub
        -- lfs.isdir("/foo") mistakenly returns true on windows so
        -- so we don't test and just make as that one is not too picky
        lfs.mkdir(full)
    end
end

-- here is oen i ran into when messign around with xavante code (keppler project)
-- where it's called in_base .. no gain in using lpeg here

function file.withinbase(path) -- don't go beyond root
    local l = 0
    if not find(path,"^/") then
        path = "/" .. path
    end
    for dir in gmatch(path,"/([^/]+)") do
        if dir == ".." then
            l = l - 1
        elseif dir ~= "." then
            l = l + 1
        end
        if l < 0 then
            return false
        end
    end
    return true
end

-- not used in context but was in luatex once:

local symlinkattributes = lfs.symlinkattributes

function lfs.readlink(name)
    return symlinkattributes(name,"target") or nil
end