summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/tex/luatex/luaotfload/otfl-font-otc.lua
blob: 35555ed05f6e8af1e1f379cea622ab2fee3bcfd3 (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
if not modules then modules = { } end modules ['font-otc'] = {
    version   = 1.001,
    comment   = "companion to font-otf.lua (context)",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

local format, insert = string.format, table.insert
local type, next = type, next

-- we assume that the other otf stuff is loaded already

local trace_loading = false  trackers.register("otf.loading", function(v) trace_loading = v end)

local otf = fonts.otf
local tfm = fonts.tfm

-- instead of "script = "DFLT", langs = { 'dflt' }" we now use wildcards (we used to
-- have always); some day we can write a "force always when true" trick for other
-- features as well
--
-- we could have a tnum variant as well

local extra_lists = {
    tlig = {
        {
            endash        = "hyphen hyphen",
            emdash        = "hyphen hyphen hyphen",
            quotedblleft  = "quoteleft quoteleft",
            quotedblright = "quoteright quoteright",
            quotedblleft  = "grave grave",
            quotedblright = "quotesingle quotesingle",
            quotedblbase  = "comma comma",
            exclamdown    = "exclam grave",
            questiondown  = "question grave",
            guillemotleft = "less less",
            guillemotright= "greater greater",
        },
    },
    trep = {
        {
            [0x0022] = 0x201D,
            [0x0027] = 0x2019,
            [0x0060] = 0x2018,
        },
    },
    anum = {
        { -- arabic
            [0x0030] = 0x0660,
            [0x0031] = 0x0661,
            [0x0032] = 0x0662,
            [0x0033] = 0x0663,
            [0x0034] = 0x0664,
            [0x0035] = 0x0665,
            [0x0036] = 0x0666,
            [0x0037] = 0x0667,
            [0x0038] = 0x0668,
            [0x0039] = 0x0669,
        },
        { -- persian
            [0x0030] = 0x06F0,
            [0x0031] = 0x06F1,
            [0x0032] = 0x06F2,
            [0x0033] = 0x06F3,
            [0x0034] = 0x06F4,
            [0x0035] = 0x06F5,
            [0x0036] = 0x06F6,
            [0x0037] = 0x06F7,
            [0x0038] = 0x06F8,
            [0x0039] = 0x06F9,
        },
    },
}

local extra_features = { -- maybe just 1..n so that we prescribe order
    tlig = {
        {
            features  = { { scripts = { { script = "*", langs = { "*" }, } }, tag = "tlig", comment = "added bij mkiv" }, },
            name      = "ctx_tlig_1",
            subtables = { { name = "ctx_tlig_1_s" } },
            type      = "gsub_ligature",
            flags     = { },
        },
    },
    trep = {
        {
            features  = { { scripts = { { script = "*", langs = { "*" }, } }, tag = "trep", comment = "added bij mkiv" }, },
            name      = "ctx_trep_1",
            subtables = { { name = "ctx_trep_1_s" } },
            type      = "gsub_single",
            flags     = { },
        },
    },
    anum = {
        {
            features  = { { scripts = { { script = "arab", langs = { "dflt", "ARA" }, } }, tag = "anum", comment = "added bij mkiv" }, },
            name      = "ctx_anum_1",
            subtables = { { name = "ctx_anum_1_s" } },
            type      = "gsub_single",
            flags     = { },
        },
        {
            features  = { { scripts = { { script = "arab", langs = { "FAR" }, } }, tag = "anum", comment = "added bij mkiv" }, },
            name      = "ctx_anum_2",
            subtables = { { name = "ctx_anum_2_s" } },
            type      = "gsub_single",
            flags     = { },
        },
    },
}

fonts.otf.enhancers["add some missing characters"] = function(data,filename)
    -- todo
end

fonts.otf.enhancers["enrich with features"] = function(data,filename)
    -- could be done elsewhere (true can be #)
    local used = { }
    for i=1,#otf.glists do
        local g = data[otf.glists[i]]
        if g then
            for i=1,#g do
                local f = g[i].features
                if f then
                    for i=1,#f do
                        local t = f[i].tag
                        if t then used[t] = true end
                    end
                end
            end
        end
    end
    --
    local glyphs = data.glyphs
    local indices = data.map.map
    data.gsub = data.gsub or { }
    for kind, specifications in next, extra_features do
        if not used[kind] then
            local done = 0
            for s=1,#specifications do
                local added = false
                local specification = specifications[s]
                local list = extra_lists[kind][s]
                local name = specification.name .. "_s"
                if specification.type == "gsub_ligature" then
                    for unicode, index in next, indices do
                        local glyph = glyphs[index]
                        local ligature = list[glyph.name]
                        if ligature then
                            local o = glyph.lookups or { }
                        --  o[name] = { "ligature", ligature, glyph.name }
                            o[name] = {
                                {
                                    ["type"] = "ligature",
                                    ["specification"] = {
                                        char = glyph.name,
                                        components = ligature,
                                    }
                                }
                            }
                            glyph.lookups, done, added = o, done+1, true
                        end
                    end
                elseif specification.type == "gsub_single" then
                    for unicode, index in next, indices do
                        local glyph = glyphs[index]
                        local r = list[unicode]
                        if r then
                            local replacement = indices[r]
                            if replacement and glyphs[replacement] then
                                local o = glyph.lookups or { }
                            --  o[name] = { { "substitution", glyphs[replacement].name } }
                                o[name] = {
                                    {
                                        ["type"] = "substitution",
                                        ["specification"] = {
                                            variant = glyphs[replacement].name,
                                        }
                                    }
                                }
                                glyph.lookups, done, added = o, done+1, true
                            end
                        end
                    end
                end
                if added then
                    insert(data.gsub,s,table.fastcopy(specification)) -- right order
                end
            end
            if done > 0 then
                if trace_loading then
                    logs.report("load otf","enhance: registering %s feature (%s glyphs affected)",kind,done)
                end
            end
        end
    end
end

otf.tables.features['tlig'] = 'TeX Ligatures'
otf.tables.features['trep'] = 'TeX Replacements'
otf.tables.features['anum'] = 'Arabic Digits'

otf.features.register_base_substitution('tlig')
otf.features.register_base_substitution('trep')
otf.features.register_base_substitution('anum')

-- the functionality is defined elsewhere

fonts.initializers.base.otf.equaldigits = fonts.initializers.common.equaldigits
fonts.initializers.node.otf.equaldigits = fonts.initializers.common.equaldigits

fonts.initializers.base.otf.lineheight  = fonts.initializers.common.lineheight
fonts.initializers.node.otf.lineheight  = fonts.initializers.common.lineheight

fonts.initializers.base.otf.compose     = fonts.initializers.common.compose
fonts.initializers.node.otf.compose     = fonts.initializers.common.compose