summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/tex/context/base/lxml-aux.lua
blob: be12659ba10e2134e51d502cc81634079c2e51f3 (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
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
if not modules then modules = { } end modules ['lxml-aux'] = {
    version   = 1.001,
    comment   = "this module is the basis for the lxml-* ones",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

-- not all functions here make sense anymore vbut we keep them for
-- compatibility reasons

local trace_manipulations = false  trackers.register("lxml.manipulations", function(v) trace_manipulations = v end)

local report_xml = logs.reporter("xml")

local xml = xml

local xmlconvert, xmlcopy, xmlname = xml.convert, xml.copy, xml.name
local xmlinheritedconvert = xml.inheritedconvert
local xmlapplylpath = xml.applylpath
local xmlfilter = xml.filter

local type, setmetatable, getmetatable = type, setmetatable, getmetatable
local insert, remove, fastcopy, concat = table.insert, table.remove, table.fastcopy, table.concat
local gmatch, gsub, format, find, strip = string.gmatch, string.gsub, string.format, string.find, string.strip
local utfbyte = utf.byte

local function report(what,pattern,c,e)
    report_xml("%s element '%s' (root: '%s', position: %s, index: %s, pattern: %s)",what,xmlname(e),xmlname(e.__p__),c,e.ni,pattern)
end

local function withelements(e,handle,depth)
    if e and handle then
        local edt = e.dt
        if edt then
            depth = depth or 0
            for i=1,#edt do
                local e = edt[i]
                if type(e) == "table" then
                    handle(e,depth)
                    withelements(e,handle,depth+1)
                end
            end
        end
    end
end

xml.withelements = withelements

function xml.withelement(e,n,handle) -- slow
    if e and n ~= 0 and handle then
        local edt = e.dt
        if edt then
            if n > 0 then
                for i=1,#edt do
                    local ei = edt[i]
                    if type(ei) == "table" then
                        if n == 1 then
                            handle(ei)
                            return
                        else
                            n = n - 1
                        end
                    end
                end
            elseif n < 0 then
                for i=#edt,1,-1 do
                    local ei = edt[i]
                    if type(ei) == "table" then
                        if n == -1 then
                            handle(ei)
                            return
                        else
                            n = n + 1
                        end
                    end
                end
            end
        end
    end
end

function xml.each(root,pattern,handle,reverse)
    local collected = xmlapplylpath(root,pattern)
    if collected then
        if reverse then
            for c=#collected,1,-1 do
                handle(collected[c])
            end
        else
            for c=1,#collected do
                handle(collected[c])
            end
        end
        return collected
    end
end

function xml.processattributes(root,pattern,handle)
    local collected = xmlapplylpath(root,pattern)
    if collected and handle then
        for c=1,#collected do
            handle(collected[c].at)
        end
    end
    return collected
end

--[[ldx--
<p>The following functions collect elements and texts.</p>
--ldx]]--

-- are these still needed -> lxml-cmp.lua

function xml.collect(root, pattern)
    return xmlapplylpath(root,pattern)
end

function xml.collecttexts(root, pattern, flatten) -- todo: variant with handle
    local collected = xmlapplylpath(root,pattern)
    if collected and flatten then
        local xmltostring = xml.tostring
        for c=1,#collected do
            collected[c] = xmltostring(collected[c].dt)
        end
    end
    return collected or { }
end

function xml.collect_tags(root, pattern, nonamespace)
    local collected = xmlapplylpath(root,pattern)
    if collected then
        local t, n = { }, 0
        for c=1,#collected do
            local e = collected[c]
            local ns, tg = e.ns, e.tg
            n = n + 1
            if nonamespace then
                t[n] = tg
            elseif ns == "" then
                t[n] = tg
            else
                t[n] = ns .. ":" .. tg
            end
        end
        return t
    end
end

--[[ldx--
<p>We've now arrived at the functions that manipulate the tree.</p>
--ldx]]--

local no_root = { no_root = true }

local function redo_ni(d)
    for k=1,#d do
        local dk = d[k]
        if type(dk) == "table" then
            dk.ni = k
        end
    end
end

local function xmltoelement(whatever,root)
    if not whatever then
        return nil
    end
    local element
    if type(whatever) == "string" then
        element = xmlinheritedconvert(whatever,root) -- beware, not really a root
    else
        element = whatever -- we assume a table
    end
    if element.error then
        return whatever -- string
    end
    if element then
    --~ if element.ri then
    --~     element = element.dt[element.ri].dt
    --~ else
    --~     element = element.dt
    --~ end
    end
    return element
end

xml.toelement = xmltoelement

local function copiedelement(element,newparent)
    if type(element) == "string" then
        return element
    else
        element = xmlcopy(element).dt
        if newparent and type(element) == "table" then
            element.__p__ = newparent
        end
        return element
    end
end

function xml.delete(root,pattern)
    if not pattern or pattern == "" then
        local p = root.__p__
        if p then
            if trace_manipulations then
                report('deleting',"--",c,root)
            end
            local d = p.dt
            remove(d,root.ni)
            redo_ni(d) -- can be made faster and inlined
        end
    else
        local collected = xmlapplylpath(root,pattern)
        if collected then
            for c=1,#collected do
                local e = collected[c]
                local p = e.__p__
                if p then
                    if trace_manipulations then
                        report('deleting',pattern,c,e)
                    end
                    local d = p.dt
                    remove(d,e.ni)
                    redo_ni(d) -- can be made faster and inlined
                end
            end
        end
    end
end

function xml.replace(root,pattern,whatever)
    local element = root and xmltoelement(whatever,root)
    local collected = element and xmlapplylpath(root,pattern)
    if collected then
        for c=1,#collected do
            local e = collected[c]
            local p = e.__p__
            if p then
                if trace_manipulations then
                    report('replacing',pattern,c,e)
                end
                local d = p.dt
                d[e.ni] = copiedelement(element,p)
                redo_ni(d) -- probably not needed
            end
        end
    end
end

local function wrap(e,wrapper)
    local t = {
        rn = e.rn,
        tg = e.tg,
        ns = e.ns,
        at = e.at,
        dt = e.dt,
        __p__ = e,
    }
    setmetatable(t,getmetatable(e))
    e.rn = wrapper.rn or e.rn or ""
    e.tg = wrapper.tg or e.tg or ""
    e.ns = wrapper.ns or e.ns or ""
    e.at = fastcopy(wrapper.at)
    e.dt = { t }
end

function xml.wrap(root,pattern,whatever)
    if whatever then
        local wrapper = xmltoelement(whatever,root)
        local collected = xmlapplylpath(root,pattern)
        if collected then
            for c=1,#collected do
                local e = collected[c]
                if trace_manipulations then
                    report('wrapping',pattern,c,e)
                end
                wrap(e,wrapper)
            end
        end
    else
        wrap(root,xmltoelement(pattern))
    end
end

local function inject_element(root,pattern,whatever,prepend)
    local element = root and xmltoelement(whatever,root)
    local collected = element and xmlapplylpath(root,pattern)
    local function inject_e(e)
        local r = e.__p__
        local d, k, rri = r.dt, e.ni, r.ri
        local edt = (rri and d[rri].dt) or (d and d[k] and d[k].dt)
        if edt then
            local be, af
            local cp = copiedelement(element,e)
            if prepend then
                be, af = cp, edt
            else
                be, af = edt, cp
            end
            local bn = #be
            for i=1,#af do
                bn = bn + 1
                be[bn] = af[i]
            end
            if rri then
                r.dt[rri].dt = be
            else
                d[k].dt = be
            end
            redo_ni(d)
        end
    end
    if not collected then
        -- nothing
    elseif collected.tg then
        -- first or so
        inject_e(collected)
    else
        for c=1,#collected do
            inject_e(collected[c])
        end
    end
end

local function insert_element(root,pattern,whatever,before) -- todo: element als functie
    local element = root and xmltoelement(whatever,root)
    local collected = element and xmlapplylpath(root,pattern)
    local function insert_e(e)
        local r = e.__p__
        local d, k = r.dt, e.ni
        if not before then
            k = k + 1
        end
        insert(d,k,copiedelement(element,r))
        redo_ni(d)
    end
    if not collected then
        -- nothing
    elseif collected.tg then
        -- first or so
        insert_e(collected)
    else
        for c=1,#collected do
            insert_e(collected[c])
        end
    end
end

xml.insert_element  =                 insert_element
xml.insertafter     =                 insert_element
xml.insertbefore    = function(r,p,e) insert_element(r,p,e,true) end
xml.injectafter     =                 inject_element
xml.injectbefore    = function(r,p,e) inject_element(r,p,e,true) end

local function include(xmldata,pattern,attribute,recursive,loaddata)
    -- parse="text" (default: xml), encoding="" (todo)
    -- attribute = attribute or 'href'
    pattern = pattern or 'include'
    loaddata = loaddata or io.loaddata
    local collected = xmlapplylpath(xmldata,pattern)
    if collected then
        for c=1,#collected do
            local ek = collected[c]
            local name = nil
            local ekdt = ek.dt
            local ekat = ek.at
            local epdt = ek.__p__.dt
            if not attribute or attribute == "" then
                name = (type(ekdt) == "table" and ekdt[1]) or ekdt -- check, probably always tab or str
            end
            if not name then
                for a in gmatch(attribute or "href","([^|]+)") do
                    name = ekat[a]
                    if name then break end
                end
            end
            local data = (name and name ~= "" and loaddata(name)) or ""
            if data == "" then
                epdt[ek.ni] = "" -- xml.empty(d,k)
            elseif ekat["parse"] == "text" then
                -- for the moment hard coded
                epdt[ek.ni] = xml.escaped(data) -- d[k] = xml.escaped(data)
            else
--~                 local settings = xmldata.settings
--~                 settings.parent_root = xmldata -- to be tested
--~                 local xi = xmlconvert(data,settings)
                local xi = xmlinheritedconvert(data,xmldata)
                if not xi then
                    epdt[ek.ni] = "" -- xml.empty(d,k)
                else
                    if recursive then
                        include(xi,pattern,attribute,recursive,loaddata)
                    end
                    epdt[ek.ni] = xml.body(xi) -- xml.assign(d,k,xi)
                end
            end
        end
    end
end

xml.include = include

local function stripelement(e,nolines,anywhere)
    local edt = e.dt
    if edt then
        if anywhere then
            local t, n = { }, 0
            for e=1,#edt do
                local str = edt[e]
                if type(str) ~= "string" then
                    n = n + 1
                    t[n] = str
                elseif str ~= "" then
                    -- todo: lpeg for each case
                    if nolines then
                        str = gsub(str,"%s+"," ")
                    end
                    str = gsub(str,"^%s*(.-)%s*$","%1")
                    if str ~= "" then
                        n = n + 1
                        t[n] = str
                    end
                end
            end
            e.dt = t
        else
            -- we can assume a regular sparse xml table with no successive strings
            -- otherwise we should use a while loop
            if #edt > 0 then
                -- strip front
                local str = edt[1]
                if type(str) ~= "string" then
                    -- nothing
                elseif str == "" then
                    remove(edt,1)
                else
                    if nolines then
                        str = gsub(str,"%s+"," ")
                    end
                    str = gsub(str,"^%s+","")
                    if str == "" then
                        remove(edt,1)
                    else
                        edt[1] = str
                    end
                end
            end
            local nedt = #edt
            if nedt > 0 then
                -- strip end
                local str = edt[nedt]
                if type(str) ~= "string" then
                    -- nothing
                elseif str == "" then
                    remove(edt)
                else
                    if nolines then
                        str = gsub(str,"%s+"," ")
                    end
                    str = gsub(str,"%s+$","")
                    if str == "" then
                        remove(edt)
                    else
                        edt[nedt] = str
                    end
                end
            end
        end
    end
    return e -- convenient
end

xml.stripelement = stripelement

function xml.strip(root,pattern,nolines,anywhere) -- strips all leading and trailing spacing
    local collected = xmlapplylpath(root,pattern) -- beware, indices no longer are valid now
    if collected then
        for i=1,#collected do
            stripelement(collected[i],nolines,anywhere)
        end
    end
end

local function renamespace(root, oldspace, newspace) -- fast variant
    local ndt = #root.dt
    for i=1,ndt or 0 do
        local e = root[i]
        if type(e) == "table" then
            if e.ns == oldspace then
                e.ns = newspace
                if e.rn then
                    e.rn = newspace
                end
            end
            local edt = e.dt
            if edt then
                renamespace(edt, oldspace, newspace)
            end
        end
    end
end

xml.renamespace = renamespace

function xml.remaptag(root, pattern, newtg)
    local collected = xmlapplylpath(root,pattern)
    if collected then
        for c=1,#collected do
            collected[c].tg = newtg
        end
    end
end

function xml.remapnamespace(root, pattern, newns)
    local collected = xmlapplylpath(root,pattern)
    if collected then
        for c=1,#collected do
            collected[c].ns = newns
        end
    end
end

function xml.checknamespace(root, pattern, newns)
    local collected = xmlapplylpath(root,pattern)
    if collected then
        for c=1,#collected do
            local e = collected[c]
            if (not e.rn or e.rn == "") and e.ns == "" then
                e.rn = newns
            end
        end
    end
end

function xml.remapname(root, pattern, newtg, newns, newrn)
    local collected = xmlapplylpath(root,pattern)
    if collected then
        for c=1,#collected do
            local e = collected[c]
            e.tg, e.ns, e.rn = newtg, newns, newrn
        end
    end
end

--[[ldx--
<p>Helper (for q2p).</p>
--ldx]]--

function xml.cdatatotext(e)
    local dt = e.dt
    if #dt == 1 then
        local first = dt[1]
        if first.tg == "@cd@" then
            e.dt = first.dt
        end
    else
        -- maybe option
    end
end

-- local x = xml.convert("<x><a>1<b>2</b>3</a></x>")
-- xml.texttocdata(xml.first(x,"a"))
-- print(x) -- <x><![CDATA[1<b>2</b>3]]></x>

function xml.texttocdata(e) -- could be a finalizer
    local dt = e.dt
    local s = xml.tostring(dt) -- no shortcut?
    e.tg = "@cd@"
    e.special = true
    e.ns = ""
    e.rn = ""
    e.dt = { s }
    e.at = nil
end

-- local x = xml.convert("<x><a>1<b>2</b>3</a></x>")
-- xml.tocdata(xml.first(x,"a"))
-- print(x) -- <x><![CDATA[<a>1<b>2</b>3</a>]]></x>

function xml.elementtocdata(e) -- could be a finalizer
    local dt = e.dt
    local s = xml.tostring(e) -- no shortcut?
    e.tg = "@cd@"
    e.special = true
    e.ns = ""
    e.rn = ""
    e.dt = { s }
    e.at = nil
end

xml.builtinentities = table.tohash { "amp", "quot", "apos", "lt", "gt" } -- used often so share

local entities        = characters and characters.entities or nil
local builtinentities = xml.builtinentities

function xml.addentitiesdoctype(root,option) -- we could also have a 'resolve' i.e. inline hex
    if not entities then
        require("char-ent")
        entities = characters.entities
    end
    if entities and root and root.tg == "@rt@" and root.statistics then
        local list = { }
        local hexify = option == "hexadecimal"
        for k, v in table.sortedhash(root.statistics.entities.names) do
            if not builtinentities[k] then
                local e = entities[k]
                if not e then
                    e = format("[%s]",k)
                elseif hexify then
                    e = format("&#%05X;",utfbyte(k))
                end
                list[#list+1] = format("  <!ENTITY %s %q >",k,e)
            end
        end
        local dt = root.dt
        local n = dt[1].tg == "@pi@" and 2 or 1
        if #list > 0 then
            insert(dt, n, { "\n" })
            insert(dt, n, {
               tg      = "@dt@", -- beware, doctype is unparsed
               dt      = { format("Something [\n%s\n] ",concat(list)) },
               ns      = "",
               special = true,
            })
            insert(dt, n, { "\n\n" })
        else
         -- insert(dt, n, { table.serialize(root.statistics) })
        end
    end
end

-- local str = [==[
-- <?xml version='1.0' standalone='yes' ?>
-- <root>
-- <a>test &nbsp; test &#123; test</a>
-- <b><![CDATA[oeps]]></b>
-- </root>
-- ]==]
--
-- local x = xml.convert(str)
-- xml.addentitiesdoctype(x,"hexadecimal")
-- print(x)

--[[ldx--
<p>Here are a few synonyms.</p>
--ldx]]--

xml.all     = xml.each
xml.insert  = xml.insertafter
xml.inject  = xml.injectafter
xml.after   = xml.insertafter
xml.before  = xml.insertbefore
xml.process = xml.each

-- obsolete

xml.obsolete   = xml.obsolete or { }
local obsolete = xml.obsolete

xml.strip_whitespace           = xml.strip                 obsolete.strip_whitespace      = xml.strip
xml.collect_elements           = xml.collect               obsolete.collect_elements      = xml.collect
xml.delete_element             = xml.delete                obsolete.delete_element        = xml.delete
xml.replace_element            = xml.replace               obsolete.replace_element       = xml.replacet
xml.each_element               = xml.each                  obsolete.each_element          = xml.each
xml.process_elements           = xml.process               obsolete.process_elements      = xml.process
xml.insert_element_after       = xml.insertafter           obsolete.insert_element_after  = xml.insertafter
xml.insert_element_before      = xml.insertbefore          obsolete.insert_element_before = xml.insertbefore
xml.inject_element_after       = xml.injectafter           obsolete.inject_element_after  = xml.injectafter
xml.inject_element_before      = xml.injectbefore          obsolete.inject_element_before = xml.injectbefore
xml.process_attributes         = xml.processattributes     obsolete.process_attributes    = xml.processattributes
xml.collect_texts              = xml.collecttexts          obsolete.collect_texts         = xml.collecttexts
xml.inject_element             = xml.inject                obsolete.inject_element        = xml.inject
xml.remap_tag                  = xml.remaptag              obsolete.remap_tag             = xml.remaptag
xml.remap_name                 = xml.remapname             obsolete.remap_name            = xml.remapname
xml.remap_namespace            = xml.remapnamespace        obsolete.remap_namespace       = xml.remapnamespace

-- new (probably ok)

function xml.cdata(e)
    if e then
        local dt = e.dt
        if dt and #dt == 1 then
            local first = dt[1]
            return first.tg == "@cd@" and first.dt[1] or ""
        end
    end
    return ""
end

function xml.finalizers.xml.cdata(collected)
    if collected then
        local e = collected[1]
        if e then
            local dt = e.dt
            if dt and #dt == 1 then
                local first = dt[1]
                return first.tg == "@cd@" and first.dt[1] or ""
            end
        end
    end
    return ""
end

function xml.insertcomment(e,str,n) -- also insertcdata
    table.insert(e.dt,n or 1,{
        tg      = "@cm@",
        ns      = "",
        special = true,
        at      = { },
        dt      = { str },
    })
end

function xml.setcdata(e,str) -- also setcomment
    e.dt = { {
        tg      = "@cd@",
        ns      = "",
        special = true,
        at      = { },
        dt      = { str },
    } }
end

-- maybe helpers like this will move to an autoloader

function xml.separate(x,pattern)
    local collected = xmlapplylpath(x,pattern)
    if collected then
        for c=1,#collected do
            local e = collected[c]
            local d = e.dt
            if d == x then
                report_xml("warning: xml.separate changes root")
                x = d
            end
            local t, n = { "\n" }, 1
            local i, nd = 1, #d
            while i <= nd do
                while i <= nd do
                    local di = d[i]
                    if type(di) == "string" then
                        if di == "\n" or find(di,"^%s+$") then -- first test is speedup
                            i = i + 1
                        else
                            d[i] = strip(di)
                            break
                        end
                    else
                        break
                    end
                end
                if i > nd then
                    break
                end
                t[n+1] = "\n"
                t[n+2] = d[i]
                t[n+3] = "\n"
                n = n + 3
                i = i + 1
            end
            t[n+1] = "\n"
            setmetatable(t,getmetatable(d))
            e.dt = t
        end
    end
    return x
end