summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/tex/context/base/mkiv/page-lin.lua
blob: 5b18d982373f73759bbb3096779fa826e9d0182a (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
if not modules then modules = { } end modules ['page-lin'] = {
    version   = 1.001,
    comment   = "companion to page-lin.mkiv",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

-- experimental -> will become builders

-- if there is demand for it, we can support multiple numbering streams
-- and use more than one attibute

local next, tonumber = next, tonumber

local trace_numbers      = false  trackers.register("lines.numbers",  function(v) trace_numbers = v end)

local report_lines       = logs.reporter("lines")

local attributes         = attributes
local nodes              = nodes
local context            = context

local implement          = interfaces.implement

nodes.lines              = nodes.lines or { }
local lines              = nodes.lines

lines.data               = lines.data or { } -- start step tag
local data               = lines.data
local last               = #data

lines.scratchbox         = lines.scratchbox or 0

storage.register("lines/data", data, "nodes.lines.data")

local variables          = interfaces.variables

local v_next             = variables.next
local v_page             = variables.page
local v_no               = variables.no

local properties         = nodes.properties

local nodecodes          = nodes.nodecodes
local skipcodes          = nodes.skipcodes
local whatcodes          = nodes.whatcodes
local listcodes          = nodes.listcodes

local hlist_code         = nodecodes.hlist
local vlist_code         = nodecodes.vlist
local whatsit_code       = nodecodes.whatsit
local glue_code          = nodecodes.glue
local glyph_code         = nodecodes.glyph
local line_code          = listcodes.line
local leftskip_code      = skipcodes.leftskip

local a_displaymath      = attributes.private('displaymath')
local a_linenumber       = attributes.private('linenumber')
local a_linereference    = attributes.private('linereference')
local a_verbatimline     = attributes.private('verbatimline')

local current_list       = { }
local cross_references   = { }
local chunksize          = 250 -- not used in boxed

local nuts               = nodes.nuts

local getid              = nuts.getid
local getsubtype         = nuts.getsubtype
local getnext            = nuts.getnext
local getattr            = nuts.getattr
local setattr            = nuts.setattr
local getlist            = nuts.getlist
local getbox             = nuts.getbox
local getfield           = nuts.getfield

local setprop            = nuts.setprop
local getprop            = nuts.getprop

local setfield           = nuts.setfield

local traverse_id        = nuts.traverse_id
local traverse           = nuts.traverse
local copy_node          = nuts.copy
local hpack_nodes        = nuts.hpack
local linked_nodes       = nuts.linked
local insert_node_after  = nuts.insert_after
local insert_node_before = nuts.insert_before
local is_display_math    = nuts.is_display_math
local leftmarginwidth    = nuts.leftmarginwidth

local nodepool           = nuts.pool
local negated_glue       = nodepool.negatedglue
local new_hlist          = nodepool.hlist
local new_kern           = nodepool.kern

local ctx_convertnumber  = context.convertnumber
local ctx_makelinenumber = context.makelinenumber

local paragraphs         = typesetters.paragraphs
local addtoline          = paragraphs.addtoline
local checkline          = paragraphs.checkline
local moveinline         = paragraphs.moveinline

-- cross referencing

function lines.number(n)
    n = tonumber(n)
    local cr = cross_references[n] or 0
    cross_references[n] = nil
    return cr
end

local function resolve(n,m) -- we can now check the 'line' flag (todo)
    while n do
        local id = getid(n)
        if id == whatsit_code then -- why whatsit
            local a = getattr(n,a_linereference)
            if a then
                cross_references[a] = m
            end
        elseif id == hlist_code or id == vlist_code then
            resolve(getlist(n),m)
        end
        n = getnext(n)
    end
end

function lines.finalize(t)
    local getnumber = lines.number
    for _,p in next, t do
        for _,r in next, p do
            local m = r.metadata
            if m and m.kind == "line" then
                local e = r.entries
                local u = r.userdata
                e.linenumber = getnumber(e.text or 0) -- we can nil e.text
                e.conversion = u and u.conversion
                r.userdata = nil -- hack
            end
        end
    end
end

local filters = structures.references.filters
local helpers = structures.helpers

structures.references.registerfinalizer(lines.finalize)

filters.line = filters.line or { }

function filters.line.default(data)
--  helpers.title(data.entries.linenumber or "?",data.metadata)
    ctx_convertnumber(data.entries.conversion or "numbers",data.entries.linenumber or "0")
end

function filters.line.page(data,prefixspec,pagespec) -- redundant
    helpers.prefixpage(data,prefixspec,pagespec)
end

function filters.line.linenumber(data) -- raw
    context(data.entries.linenumber or "0")
end

-- boxed variant, todo: use number mechanism

lines.boxed = { }
local boxed = lines.boxed

-- todo: cache setups, and free id no longer used
-- use interfaces.cachesetup(t)

function boxed.register(configuration)
    last = last + 1
    data[last] = configuration
    if trace_numbers then
        report_lines("registering setup %a",last)
    end
    return last
end

implement {
    name      = "registerlinenumbering",
    actions   = { boxed.register, context },
    arguments = {
        {
            { "continue" },
            { "start", "integer" },
            { "step", "integer" },
            { "method" },
            { "tag" },
        }
    }
}

function boxed.setup(n,configuration)
    local d = data[n]
    if d then
        if trace_numbers then
            report_lines("updating setup %a",n)
        end
        for k,v in next, configuration do
            d[k] = v
        end
    else
        if trace_numbers then
            report_lines("registering setup %a (br)",n)
        end
        data[n] = configuration
    end
    return n
end

implement {
    name      = "setuplinenumbering",
    actions   = boxed.setup,
    arguments = {
        "integer",
        {
            { "continue" },
            { "start", "integer" },
            { "step", "integer" },
            { "method" },
            { "tag" },
        }
    }
}

local function check_number(n,a,skip,sameline)
    local d = data[a]
    if d then
        local tag, skipflag, s = d.tag or "", 0, d.start or 1
        current_list[#current_list+1] = { n, s }
        if sameline then
            skipflag = 0
            if trace_numbers then
                report_lines("skipping broken line number %s for setup %a: %s (%s)",#current_list,a,s,d.continue or v_no)
            end
        elseif not skip and s % d.step == 0 then
            skipflag, d.start = 1, s + 1 -- (d.step or 1)
            if trace_numbers then
                report_lines("making number %s for setup %a: %s (%s)",#current_list,a,s,d.continue or v_no)
            end
        else
            skipflag, d.start = 0, s + 1 -- (d.step or 1)
            if trace_numbers then
                report_lines("skipping line number %s for setup %a: %s (%s)",#current_list,a,s,d.continue or v_no)
            end
        end
        local p = checkline(n)
        if p then
            ctx_makelinenumber(tag,skipflag,s,p.hsize,p.reverse and "TRT" or "TLT")
        else
            report_lines("needs checking")
        end
    end
end

-- print(nodes.idstostring(list))

-- hlists of type line will only have an attribute when the line number attribute
-- still set at par building time which is not always the case unless we explicitly
-- do a par before we end the line

-- todo: check for a: when <= 0 then false

local function lineisnumbered(n)
    local n = getlist(n)
    while n do
        local id = getid(n)
        if id == hlist_code or id == vlist_code then
            -- this can hit fast as we inherit anchor attributes from parent
            local a = getattr(n,a_linenumber)
            if a and a > 0 then
                return a
            end
        elseif id == glyph_code then
            local a = getattr(n,a_linenumber)
            if a and a > 0 then
                return a
            else
                return false
            end
        end
        n = getnext(n)
    end
end

local function listisnumbered(list)
    if list then
        for n in traverse_id(hlist_code,list) do
            if getsubtype(n) == line_code then
                local a = getattr(n,a_linenumber)
                if a then
                    -- a quick test for lines (only valid when \par before \stoplinenumbering)
                    return a > 0 and list or false
                else
                    -- a bit slower one, assuming that we have normalized and anchored
                    if lineisnumbered(n) then
                        return list
                    end
                end
            end
        end
    end
end

local function findnumberedlist(list)
    -- we assume wrapped boxes, only one with numbers
    local n = list
    while n do
        local id = getid(n)
        if id == hlist_code then
            if getsubtype(n) == line_code then
                local a = getattr(n,a_linenumber)
                if a then
                    return a > 0 and list
                end
                return
            else
                local list = getlist(n)
                if lineisnumbered(list) then
                    return n
                end
                local okay = findnumberedlist(list)
                if okay then
                    return okay
                end
            end
        elseif id == vlist_code then
            local list = getlist(n)
            if listisnumbered(list) then
                return list
            end
            local okay = findnumberedlist(list)
            if okay then
                return okay
            end
        elseif id == glyph_code then
            return
        end
        n = getnext(n)
    end
end

-- reset ranges per page
-- store first and last per page
-- maybe just set marks directly

local function findcolumngap(list)
    -- we assume wrapped boxes, only one with numbers
    local n = list
    while n do
        local id = getid(n)
        if id == hlist_code or id == vlist_code then
            local p = properties[n]
            if p and p.columngap then
                if trace_numbers then
                    report_lines("first column gap %a",p.columngap)
                end
                return n
            else
                local list = getlist(n)
                if list then
                    local okay = findcolumngap(list)
                    if okay then
                        return okay
                    end
                end
            end
        end
        n = getnext(n)
    end
end

function boxed.stage_one(n,nested)
    current_list = { }
    local box = getbox(n)
    if not box then
        return
    end
    local list = getlist(box)
    if not list then
        return
    end
    local last_a = nil
    local last_v = -1
    local skip   = false

    local function check()
        for n in traverse_id(hlist_code,list) do -- attr test here and quit as soon as zero found
            local subtype = getsubtype(n)
            if subtype ~= line_code then
                -- go on
            elseif getfield(n,"height") == 0 and getfield(n,"depth") == 0 then
                -- skip funny hlists -- todo: check line subtype
            else
                local a = lineisnumbered(n)
                if a then
                    if last_a ~= a then
                        local da = data[a]
                        local ma = da.method
                        if ma == v_next then
                            skip = true
                        elseif ma == v_page then
                            da.start = 1 -- eventually we will have a normal counter
                        end
                        last_a = a
                        if trace_numbers then
                            report_lines("starting line number range %s: start %s, continue %s",a,da.start,da.continue or v_no)
                        end
                    end
                    if getattr(n,a_displaymath) then
                        if is_display_math(n) then
                            check_number(n,a,skip)
                        end
                    else
                        local v = getattr(list,a_verbatimline)
                        if not v or v ~= last_v then
                            last_v = v
                            check_number(n,a,skip)
                        else
                            check_number(n,a,skip,true)
                        end
                    end
                    skip = false
                end
            end
        end
    end

    if nested == 0 then
        if list then
            check()
        end
    elseif nested == 1 then
        local id = getid(box)
        if id == vlist_code then
            if listisnumbered(list) then
                -- ok
            else
                list = findnumberedlist(list)
            end
        else -- hlist
            list = findnumberedlist(list)
        end
        if list then
            check()
        end
    elseif nested == 2 then
        list = findcolumngap(list)
        -- we assume we have a vlist
        if not list then
            return
        end
        for n in traverse_id(vlist_code,list) do
            local p = properties[n]
            if p and p.columngap then
                if trace_numbers then
                    report_lines("found column gap %a",p.columngap)
                end
                list = getlist(n)
                if list then
                    check()
                end
            end
        end
    else
        -- bad call
    end
end

-- column attribute

function boxed.stage_two(n,m)
    if #current_list > 0 then
        m = m or lines.scratchbox
        local t, tn = { }, 0
        for l in traverse_id(hlist_code,getlist(getbox(m))) do
            tn = tn + 1
            t[tn] = copy_node(l) -- use take_box instead
        end
        for i=1,#current_list do
            local li = current_list[i]
            local n, m, ti = li[1], li[2], t[i]
            if ti then
             -- local d = getfield(n,"dir")
             -- local l = getlist(n)
             -- if d == "TRT" then
             --     local w = getfield(n,"width")
             --     ti = hpack_nodes(linked_nodes(new_kern(-w),ti,new_kern(w)))
             -- end
             -- setnext(ti,l)
             -- setprev(l,ti)
             -- setlist(n,ti)
                addtoline(n,ti)
                resolve(n,m)
            else
                report_lines("error in linenumbering (1)")
                return
            end
       end
    end
end

-- function boxed.stage_zero(n) -- not used
--     return identify(getlist(getbox(n)))
-- end

implement {
    name      = "linenumbersstageone",
    actions   = boxed.stage_one,
    arguments = { "integer", "integer" }
}

implement {
    name      = "linenumbersstagetwo",
    actions   = boxed.stage_two,
    arguments = { "integer", "integer" }
}