summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/tex/luatex/luamplib/luamplib.lua
blob: 84c583ffd618799fe593fd806ab9bdf0f42cc3ec (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
-- 
--  This is file `luamplib.lua',
--  generated with the docstrip utility.
-- 
--  The original source files were:
-- 
--  luamplib.dtx  (with options: `lua')
--  This is a generated file.
--  
--  Copyright (C) 2008-2009 by Hans Hagen, Taco Hoekwater and Elie Roux
--  <elie.roux@telecom-bretagne.eu>.
--  
--  This work is under the CC0 license.
--  
--  This Current Maintainer of this work is Elie Roux.
--  
--  This work consists of the main source file luamplib.dtx
--  and the derived files
--     luamplib.sty, luamplib.lua, luamplib-createmem.lua and luamplib.pdf.
--  

luamplib = { }

luamplib.module = {
    name          = "luamplib",
    version       =  1.02,
    date          = "2009/10/06",
    description   = "Lua package to typeset Metapost with LuaTeX's MPLib.",
    author        = "Hans Hagen, Taco Hoekwater & Elie Roux",
    copyright     = "ConTeXt Development Team & Elie Roux",
    license       = "CC0",
}

luatextra.provides_module(luamplib.module)


local format, concat, abs = string.format, table.concat, math.abs


luamplib.currentformat = "plain"
luamplib.currentmem = "mplib-luatex"

local currentformat = luamplib.currentformat
local currentmem = luamplib.currentmem

function luamplib.setformat (name)
    luamplib.currentformat = name
end

function luamplib.setmemfile(name)
    luamplib.currentmem = name
end


local mpkpse = kpse.new("luatex","mpost")

function luamplib.finder(name, mode, ftype)
    if mode == "w" then
        return name
    else
        local result = mpkpse:find_file(name,ftype)
        if not result and ftype == "mem" then
            result = mpkpse:find_file("metapost/"..name,ftype)
        end
        return result
    end
end

function luamplib.info (...)
    luatextra.module_info('luamplib', format(...))
end

function luamplib.log (...)
    luatextra.module_log('luamplib', format(...))
end

function luamplib.term (...)
    luatextra.module_term('luamplib', format(...))
end

function luamplib.warning (...)
    luatextra.module_warning('luamplib', format(...))
end

function luamplib.error (...)
    luatextra.module_error('luamplib', format(...))
end


luamplib.data = ""

function luamplib.resetdata()
    luamplib.data = ""
end

function luamplib.addline(line)
    luamplib.data = luamplib.data .. '\n' .. line
end

function luamplib.processlines()
    luamplib.process(luamplib.data)
    luamplib.resetdata()
end


function luamplib.input_mp(name)
    local mpx = mplib.new {
        ini_version = true,
        find_file = luamplib.finder,
        job_name = name,
    }
    mpx:execute(format("input %s ;",name))
    return mpx
end


function luamplib.load()
    local mpx = mplib.new {
        ini_version = false,
        mem_name = currentmem,
        find_file = luamplib.finder
    }
    if mpx then
        luamplib.log("using mem file %s", luamplib.finder(currentmem, 'r', 'mem'))
    else
        mpx = luamplib.input_mp(currentformat)
        if mpx then
            luamplib.log("using mp file %s", luamplib.finder(currentformat, 'r', 'mp'))
        else
            luamplib.error("unable to load the metapost format.")
        end
    end
    return mpx
end


function luamplib.report(result)
    if not result then
        luamplib.error("no result object")
    elseif result.status > 0 then
        local t, e, l, f = result.term, result.error, result.log
        if l then
            luamplib.log(l)
        end
        if t then
            luamplib.term(t)
        end
        if e then
            if result.status == 1 then
                luamplib.warning(e)
            else
                luamplib.error(e)
            end
        end
        if not t and not e and not l then
            if result.status == 1 then
                luamplib.warning("unknown error, no error, terminal or log messages, maybe missing beginfig/endfig")
            else
                luamplib.error("unknown error, no error, terminal or log messages, maybe missing beginfig/endfig")
            end
        end
    else
        return true
    end
    return false
end

function luamplib.process(data)
    local converted, result = false, {}
    local mpx = luamplib.load()
    if mpx and data then
        local result = mpx:execute(data)
        if luamplib.report(result) then
            if result.fig then
                converted = luamplib.convert(result)
            else
                luamplib.warning("no figure output")
            end
        end
    else
        luamplib.error("Mem file unloadable. Maybe generated with a different version of mplib?")
    end
    return converted, result
end

local function getobjects(result,figure,f)
    return figure:objects()
end

function luamplib.convert(result, flusher)
    luamplib.flush(result, flusher)
    return true -- done
end

local function pdf_startfigure(n,llx,lly,urx,ury)
    tex.sprint(format("\\mplibstarttoPDF{%s}{%s}{%s}{%s}",llx,lly,urx,ury))
end

local function pdf_stopfigure()
    tex.sprint("\\mplibstoptoPDF")
end

function pdf_literalcode(fmt,...) -- table
    tex.sprint(format("\\mplibtoPDF{%s}",format(fmt,...)))
end

function pdf_textfigure(font,size,text,width,height,depth)
    text = text:gsub(".","\\hbox{%1}") -- kerning happens in metapost
    tex.sprint(format("\\mplibtextext{%s}{%s}{%s}{%s}{%s}",font,size,text,0,-( 7200/ 7227)/65536*depth))
end

local bend_tolerance = 131/65536

local rx, sx, sy, ry, tx, ty, divider = 1, 0, 0, 1, 0, 0, 1

local function pen_characteristics(object)
    if luamplib.pen_info then
        local t = luamplib.pen_info(object)
        rx, ry, sx, sy, tx, ty = t.rx, t.ry, t.sx, t.sy, t.tx, t.ty
        divider = sx*sy - rx*ry
        return not (sx==1 and rx==0 and ry==0 and sy==1 and tx==0 and ty==0), t.width
    else
        rx, sx, sy, ry, tx, ty, divider = 1, 0, 0, 1, 0, 0, 1
        return false, 1
    end
end

local function concat(px, py) -- no tx, ty here
    return (sy*px-ry*py)/divider,(sx*py-rx*px)/divider
end

local function curved(ith,pth)
    local d = pth.left_x - ith.right_x
    if abs(ith.right_x - ith.x_coord - d) <= bend_tolerance and abs(pth.x_coord - pth.left_x - d) <= bend_tolerance then
        d = pth.left_y - ith.right_y
        if abs(ith.right_y - ith.y_coord - d) <= bend_tolerance and abs(pth.y_coord - pth.left_y - d) <= bend_tolerance then
            return false
        end
    end
    return true
end

local function flushnormalpath(path,open)
    local pth, ith
    for i=1,#path do
        pth = path[i]
        if not ith then
            pdf_literalcode("%f %f m",pth.x_coord,pth.y_coord)
        elseif curved(ith,pth) then
            pdf_literalcode("%f %f %f %f %f %f c",ith.right_x,ith.right_y,pth.left_x,pth.left_y,pth.x_coord,pth.y_coord)
        else
            pdf_literalcode("%f %f l",pth.x_coord,pth.y_coord)
        end
        ith = pth
    end
    if not open then
        local one = path[1]
        if curved(pth,one) then
            pdf_literalcode("%f %f %f %f %f %f c",pth.right_x,pth.right_y,one.left_x,one.left_y,one.x_coord,one.y_coord )
        else
            pdf_literalcode("%f %f l",one.x_coord,one.y_coord)
        end
    elseif #path == 1 then
        -- special case .. draw point
        local one = path[1]
        pdf_literalcode("%f %f l",one.x_coord,one.y_coord)
    end
    return t
end

local function flushconcatpath(path,open)
    pdf_literalcode("%f %f %f %f %f %f cm", sx, rx, ry, sy, tx ,ty)
    local pth, ith
    for i=1,#path do
        pth = path[i]
        if not ith then
           pdf_literalcode("%f %f m",concat(pth.x_coord,pth.y_coord))
        elseif curved(ith,pth) then
            local a, b = concat(ith.right_x,ith.right_y)
            local c, d = concat(pth.left_x,pth.left_y)
            pdf_literalcode("%f %f %f %f %f %f c",a,b,c,d,concat(pth.x_coord, pth.y_coord))
        else
           pdf_literalcode("%f %f l",concat(pth.x_coord, pth.y_coord))
        end
        ith = pth
    end
    if not open then
        local one = path[1]
        if curved(pth,one) then
            local a, b = concat(pth.right_x,pth.right_y)
            local c, d = concat(one.left_x,one.left_y)
            pdf_literalcode("%f %f %f %f %f %f c",a,b,c,d,concat(one.x_coord, one.y_coord))
        else
            pdf_literalcode("%f %f l",concat(one.x_coord,one.y_coord))
        end
    elseif #path == 1 then
        -- special case .. draw point
        local one = path[1]
        pdf_literalcode("%f %f l",concat(one.x_coord,one.y_coord))
    end
    return t
end


function luamplib.flush(result,flusher)
    if result then
        local figures = result.fig
        if figures then
            for f=1, #figures do
                luamplib.log("flushing figure %s",f)
                local figure = figures[f]
                local objects = getobjects(result,figure,f)
                local fignum = tonumber((figure:filename()):match("([%d]+)$") or figure:charcode() or 0)
                local miterlimit, linecap, linejoin, dashed = -1, -1, -1, false
                local bbox = figure:boundingbox()
                local llx, lly, urx, ury = bbox[1], bbox[2], bbox[3], bbox[4] -- faster than unpack
                if urx < llx then
                    -- invalid
                    pdf_startfigure(fignum,0,0,0,0)
                    pdf_stopfigure()
                else
                    pdf_startfigure(fignum,llx,lly,urx,ury)
                    pdf_literalcode("q")
                    if objects then
                        for o=1,#objects do
                            local object = objects[o]
                            local objecttype = object.type
                            if objecttype == "start_bounds" or objecttype == "stop_bounds" then
                                -- skip
                            elseif objecttype == "start_clip" then
                                pdf_literalcode("q")
                                flushnormalpath(object.path,t,false)
                                pdf_literalcode("W n")
                            elseif objecttype == "stop_clip" then
                                pdf_literalcode("Q")
                                miterlimit, linecap, linejoin, dashed = -1, -1, -1, false
                            elseif objecttype == "special" then
                                -- not supported
                            elseif objecttype == "text" then
                                local ot = object.transform -- 3,4,5,6,1,2
                                pdf_literalcode("q %f %f %f %f %f %f cm",ot[3],ot[4],ot[5],ot[6],ot[1],ot[2])
                                pdf_textfigure(object.font,object.dsize,object.text,object.width,object.height,object.depth)
                                pdf_literalcode("Q")
                            else
                                local cs = object.color
                                if cs and #cs > 0 then
                                    pdf_literalcode(luamplib.colorconverter(cs))
                                end
                                local ml = object.miterlimit
                                if ml and ml ~= miterlimit then
                                    miterlimit = ml
                                    pdf_literalcode("%f M",ml)
                                end
                                local lj = object.linejoin
                                if lj and lj ~= linejoin then
                                    linejoin = lj
                                    pdf_literalcode("%i j",lj)
                                end
                                local lc = object.linecap
                                if lc and lc ~= linecap then
                                    linecap = lc
                                    pdf_literalcode("%i J",lc)
                                end
                                local dl = object.dash
                                if dl then
                                    local d = format("[%s] %i d",concat(dl.dashes or {}," "),dl.offset)
                                    if d ~= dashed then
                                        dashed = d
                                        pdf_literalcode(dashed)
                                    end
                                elseif dashed then
                                   pdf_literalcode("[] 0 d")
                                   dashed = false
                                end
                                local path = object.path
                                local transformed, penwidth = false, 1
                                local open = path and path[1].left_type and path[#path].right_type
                                local pen = object.pen
                                if pen then
                                   if pen.type == 'elliptical' then
                                        transformed, penwidth = pen_characteristics(object) -- boolean, value
                                        pdf_literalcode("%f w",penwidth)
                                        if objecttype == 'fill' then
                                            objecttype = 'both'
                                        end
                                   else -- calculated by mplib itself
                                        objecttype = 'fill'
                                   end
                                end
                                if transformed then
                                    pdf_literalcode("q")
                                end
                                if path then
                                    if transformed then
                                        flushconcatpath(path,open)
                                    else
                                        flushnormalpath(path,open)
                                    end
                                    if objecttype == "fill" then
                                        pdf_literalcode("h f")
                                    elseif objecttype == "outline" then
                                        pdf_literalcode((open and "S") or "h S")
                                    elseif objecttype == "both" then
                                        pdf_literalcode("h B")
                                    end
                                end
                                if transformed then
                                    pdf_literalcode("Q")
                                end
                                local path = object.htap
                                if path then
                                    if transformed then
                                        pdf_literalcode("q")
                                    end
                                    if transformed then
                                        flushconcatpath(path,open)
                                    else
                                        flushnormalpath(path,open)
                                    end
                                    if objecttype == "fill" then
                                        pdf_literalcode("h f")
                                    elseif objecttype == "outline" then
                                        pdf_literalcode((open and "S") or "h S")
                                    elseif objecttype == "both" then
                                        pdf_literalcode("h B")
                                    end
                                    if transformed then
                                        pdf_literalcode("Q")
                                    end
                                end
                                if cr then
                                    pdf_literalcode(cr)
                                end
                            end
                       end
                    end
                    pdf_literalcode("Q")
                    pdf_stopfigure()
                end
            end
        end
    end
end

function luamplib.colorconverter(cr)
    local n = #cr
    if n == 4 then
        local c, m, y, k = cr[1], cr[2], cr[3], cr[4]
        return format("%.3f %.3f %.3f %.3f k %.3f %.3f %.3f %.3f K",c,m,y,k,c,m,y,k), "0 g 0 G"
    elseif n == 3 then
        local r, g, b = cr[1], cr[2], cr[3]
        return format("%.3f %.3f %.3f rg %.3f %.3f %.3f RG",r,g,b,r,g,b), "0 g 0 G"
    else
        local s = cr[1]
        return format("%.3f g %.3f G",s,s), "0 g 0 G"
    end
end
-- 
--  End of File `luamplib.lua'.