1if not modules then modules = { } end modules ['math-ext'] = {
2 version = 1.001,
3 comment = "companion to math-ini.mkiv",
4 author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
5 copyright = "PRAGMA ADE / ConTeXt Development Team",
6 license = "see context related readme files"
7}
8
9local basename = file.basename
10local sortedhash = table.sortedhash
11
12local mathematics = mathematics
13local extras = mathematics.extras or { }
14mathematics.extras = extras
15
16local characters = characters
17local chardata = characters.data
18local mathpairs = characters.mathpairs
19
20local trace_virtual = false
21local report_math = logs.reporter("mathematics")
22
23trackers.register("math.virtual", function(v) trace_virtual = v end)
24
25local mathplus = { }
26
27
28
29
30function extras.add(unicode)
31 local min = mathematics.extrabase
32 local max = min + 0xFFF
33 if unicode >= min and unicode <= max then
34 if chardata[unicode] then
35 mathplus[unicode] = true
36 else
37 report_math("extra %U is not a registered code point",unicode)
38 end
39 else
40 report_math("extra %U should be in range %U - %U",unicode,min,max)
41 end
42end
43
44function extras.copy(target,original)
45 local characters = target.characters
46 local properties = target.properties
47 local parameters = target.parameters
48 for unicode in sortedhash(mathplus) do
49 local extradesc = chardata[unicode]
50 local nextinsize = extradesc.nextinsize
51 if nextinsize then
52 local extrachar = characters[unicode]
53 local first = 1
54 local charused = unicode
55 if not extrachar then
56 for i=1,#nextinsize do
57 local slot = nextinsize[i]
58 extrachar = characters[slot]
59 if extrachar then
60 characters[unicode] = extrachar
61 first = i + 1
62 charused = slot
63 break
64 end
65 end
66 end
67 if not extrachar then
68 if trace_virtual then
69 report_math("extra %U in %a at %p with class %a and name %a is not mapped",
70 unicode,basename(properties.fullname),parameters.size,
71 extradesc.mathclass,extradesc.mathname)
72 end
73 elseif not extrachar.next then
74 local nextused = false
75 for i=first,#nextinsize do
76 local nextslot = nextinsize[i]
77 local nextbase = characters[nextslot]
78 if nextbase then
79 local nextnext = nextbase and nextbase.next
80 if nextnext then
81 local nextchar = characters[nextnext]
82 if nextchar then
83 extrachar.next = nextchar
84 nextused = nextslot
85 break
86 end
87 end
88 end
89 end
90 if trace_virtual then
91 if nextused then
92 report_math("extra %U in %a at %p with class %a and name %a maps onto %U with next %U",
93 unicode,basename(properties.fullname),parameters.size,charused,
94 extradesc.mathclass,extradesc.mathname,nextused)
95 else
96 report_math("extra %U in %a at %p with class %a and name %a maps onto %U with no next",
97 unicode,basename(properties.fullname),parameters.size,charused,
98 extradesc.mathclass,extradesc.mathname)
99 end
100 end
101 else
102 if trace_virtual then
103 report_math("extra %U in %a at %p with class %a and name %a maps onto %U with no next",
104 unicode,basename(properties.fullname),parameters.size,charused,
105 extradesc.mathclass,extradesc.mathname)
106 end
107 end
108 end
109 end
110end
111
112utilities.sequencers.appendaction(mathactions,"system","mathematics.extras.copy")
113
114extras.add(0xFE321)
115extras.add(0xFE322)
116extras.add(0xFE323)
117extras.add(0xFE324)
118 |
