summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/tex/luatex/lualibs/lualibs-util-sta.lua
blob: d140cacdcd81afb1d4857fbc4eb43f498efe5046 (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
if not modules then modules = { } end modules ['util-sta'] = {
    version   = 1.001,
    comment   = "companion to util-ini.mkiv",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

local insert, remove, fastcopy, concat = table.insert, table.remove, table.fastcopy, table.concat
local format = string.format
local select, tostring = select, tostring

local trace_stacker = false  trackers.register("stacker.resolve", function(v) trace_stacker = v end)

local stacker = stacker or { }

utilities.stacker = stacker

local function start(s,t,first,last)
    if s.mode == "switch" then
        local n = tostring(t[last])
        if trace_stacker then
            s.report("start: %s",n)
        end
        return n
    else
        local r = { }
        for i=first,last do
            r[#r+1] = tostring(t[i])
        end
        local n = concat(r," ")
        if trace_stacker then
            s.report("start: %s",n)
        end
        return n
    end
end

local function stop(s,t,first,last)
    if s.mode == "switch" then
        local n = tostring(false)
        if trace_stacker then
            s.report("stop: %s",n)
        end
        return n
    else
        local r = { }
        for i=last,first,-1 do
            r[#r+1] = tostring(false)
        end
        local n = concat(r," ")
        if trace_stacker then
            s.report("stop: %s",n)
        end
        return n
    end
end

local function change(s,t1,first1,last1,t2,first2,last2)
    if s.mode == "switch" then
        local n = tostring(t2[last2])
        if trace_stacker then
            s.report("change: %s",n)
        end
        return n
    else
        local r = { }
        for i=last1,first1,-1 do
            r[#r+1] = tostring(false)
        end
        local n = concat(r," ")
        for i=first2,last2 do
            r[#r+1] = tostring(t2[i])
        end
        if trace_stacker then
            s.report("change: %s",n)
        end
        return n
    end
end

function stacker.new(name)

    local report = logs.reporter("stacker",name or nil)

    local s

    local stack = { }
    local list  = { }
    local ids   = { }
    local hash  = { }

    local hashing = true

    local function push(...)
        for i=1,select("#",...) do
            insert(stack,(select(i,...))) -- watch the ()
        end
        if hashing then
            local c = concat(stack,"|")
            local n = hash[c]
            if not n then
                n = #list+1
                hash[c] = n
                list[n] = fastcopy(stack)
            end
            insert(ids,n)
            return n
        else
            local n = #list+1
            list[n] = fastcopy(stack)
            insert(ids,n)
            return n
        end
    end

    local function pop()
        remove(stack)
        remove(ids)
        return ids[#ids] or s.unset or -1
    end

    local function clean()
        if #stack == 0 then
            if trace_stacker then
                s.report("%s list entries, %s stack entries",#list,#stack)
            end
        end
    end

    local tops   = { }
    local top    = nil
    local switch = nil

    local function resolve_reset(mode)
        if #tops > 0 then
            report("resetting %s left-over states of %a",#tops,name)
        end
        tops   = { }
        top    = nil
        switch = nil
    end

    local function resolve_begin(mode)
        if mode then
            switch = mode == "switch"
        else
            switch = s.mode == "switch"
        end
        top = { switch = switch }
        insert(tops,top)
    end

    local function resolve_step(ti) -- keep track of changes outside function !
        -- todo: optimize for n=1 etc
        local result = nil
        local noftop = top and #top or 0
        if ti > 0 then
            local current = list[ti]
            if current then
                local noflist = #current
                local nofsame = 0
                if noflist > noftop then
                    for i=1,noflist do
                        if current[i] == top[i] then
                            nofsame = i
                        else
                            break
                        end
                    end
                else
                    for i=1,noflist do
                        if current[i] == top[i] then
                            nofsame = i
                        else
                            break
                        end
                    end
                end
                local plus = nofsame + 1
                if plus <= noftop then
                    if plus <= noflist then
                        if switch then
                            result = s.change(s,top,plus,noftop,current,nofsame,noflist)
                        else
                            result = s.change(s,top,plus,noftop,current,plus,noflist)
                        end
                    else
                        if switch then
                            result = s.change(s,top,plus,noftop,current,nofsame,noflist)
                        else
                            result = s.stop(s,top,plus,noftop)
                        end
                    end
                elseif plus <= noflist then
                    if switch then
                        result = s.start(s,current,nofsame,noflist)
                    else
                        result = s.start(s,current,plus,noflist)
                    end
                end
                top = current
            else
                if 1 <= noftop then
                    result = s.stop(s,top,1,noftop)
                end
                top = { }
            end
            return result
        else
            if 1 <= noftop then
                result = s.stop(s,top,1,noftop)
            end
            top = { }
            return result
        end
    end

    local function resolve_end()
     -- resolve_step(s.unset)
        if #tops > 0 then -- was #top brrr
            local result = s.stop(s,top,1,#top)
            remove(tops)
            top = tops[#tops]
            switch = top and top.switch
            return result
        end
    end

    local function resolve(t)
        resolve_begin()
        for i=1,#t do
            resolve_step(t[i])
        end
        resolve_end()
    end

    s = {
        name          = name or "unknown",
        unset         = -1,
        report        = report,
        start         = start,
        stop          = stop,
        change        = change,
        push          = push,
        pop           = pop,
        clean         = clean,
        resolve       = resolve,
        resolve_begin = resolve_begin,
        resolve_step  = resolve_step,
        resolve_end   = resolve_end,
        resolve_reset = resolve_reset,
    }

    return s -- we can overload functions

end

-- local s = utilities.stacker.new("demo")
--
-- local unset = s.unset
-- local push  = s.push
-- local pop   = s.pop
--
-- local t = {
--     unset,
--     unset,
--     push("a"),     -- a
--     push("b","c"), -- a b c
--     pop(),         -- a b
--     push("d"),     -- a b d
--     pop(),         -- a b
--     unset,
--     pop(),         -- a
--     pop(),         -- b
--     unset,
--     unset,
-- }
--
-- s.resolve(t)

-- demostacker = utilities.stacker.new("demos")
--
-- local whatever = {
--     one     = "1 0 0 RG 1 0 0 rg",
--     two     = "1 1 0 RG 1 1 0 rg",
--     [false] = "0 G 0 g",
-- }
--
-- local concat = table.concat
--
-- local pdfpageliteral = nodes.pool.pdfpageliteral
--
-- function demostacker.start(s,t,first,last)
--     local n = whatever[t[last]]
--  -- s.report("start: %s",n)
--     return pdfpageliteral(n)
-- end
--
-- function demostacker.stop(s,t,first,last)
--     local n = whatever[false]
--  -- s.report("stop: %s",n)
--     return pdfpageliteral(n)
-- end
--
-- function demostacker.change(s,t1,first1,last1,t2,first2,last2)
--     local n = whatever[t2[last2]]
--  -- s.report("change: %s",n)
--     return pdfpageliteral(n)
-- end
--
-- demostacker.mode = "switch"
--
-- local whatever = {
--     one     = "/OC /test1 BDC",
--     two     = "/OC /test2 BDC",
--     [false] = "EMC",
-- }
--
-- demostacker = utilities.stacker.new("demos")
--
-- function demostacker.start(s,t,first,last)
--     local r = { }
--     for i=first,last do
--         r[#r+1] = whatever[t[i]]
--     end
--  -- s.report("start: %s",concat(r," "))
--     return pdfpageliteral(concat(r," "))
-- end
--
-- function demostacker.stop(s,t,first,last)
--     local r = { }
--     for i=last,first,-1 do
--         r[#r+1] = whatever[false]
--     end
--  -- s.report("stop: %s",concat(r," "))
--     return pdfpageliteral(concat(r," "))
-- end
--
-- function demostacker.change(s,t1,first1,last1,t2,first2,last2)
--     local r = { }
--     for i=last1,first1,-1 do
--         r[#r+1] = whatever[false]
--     end
--     for i=first2,last2 do
--         r[#r+1] = whatever[t2[i]]
--     end
--  -- s.report("change: %s",concat(r," "))
--     return pdfpageliteral(concat(r," "))
-- end
--
-- demostacker.mode = "stack"