summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/tex/luatex/lua-uni-algos/lua-uni-normalize.lua
blob: dc1356568cb8bdfa3079f95ff8a6d5dd0f07e87a (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
-- lua-uni-normalize.lua
-- Copyright 2020 Marcel Krüger
--
-- This work may be distributed and/or modified under the
-- conditions of the LaTeX Project Public License, either version 1.3
-- of this license or (at your option) any later version.
-- The latest version of this license is in
--   http://www.latex-project.org/lppl.txt
-- and version 1.3 or later is part of all distributions of LaTeX
-- version 2005/12/01 or later.
--
-- This work has the LPPL maintenance status `maintained'.
-- 
-- The Current Maintainer of this work is Marcel Krüger

-- Provide all four kinds of Unicode normalization

local newtable = lua.newtable
local move = table.move
local char = utf8.char
local codes = utf8.codes
local unpack = table.unpack

kpse.set_program_name'kpsewhich'
local ccc, composition_mapping, decomposition_mapping, compatibility_mapping do
  local function doubleset(ts, key, v1, kind, v2)
    ts[1][key] = v1
    ts[3][key] = v2
    if not kind then
      ts[2][key] = v2
    end
    return ts
  end
  local p = require'lua-uni-parse'
  local l = lpeg
  local Cnil = l.Cc(nil)
  local letter = lpeg.R('AZ', 'az')
  ccc, decomposition_mapping, compatibility_mapping
                    = unpack(p.parse_file('UnicodeData', l.Cf(
    l.Ct(l.Ct'' * l.Ct'' * l.Ct'') * (
      l.Cg(p.fields(p.codepoint,
                    p.ignore_field,
                    p.ignore_field,
                    '0' * Cnil + p.number,
                    p.ignore_field,
                    ('<' * l.C(letter^1) * '> ' + Cnil)
                  * l.Ct(p.codepoint * (' ' * p.codepoint)^0)^-1,
                    p.ignore_line)) + p.eol
    )^0 * -1, doubleset)))

  composition_mapping = {}
  local composition_exclusions = {      [0x00958] = true, [0x00959] = true,
    [0x0095A] = true, [0x0095B] = true, [0x0095C] = true, [0x0095D] = true,
    [0x0095E] = true, [0x0095F] = true, [0x009DC] = true, [0x009DD] = true,
    [0x009DF] = true, [0x00A33] = true, [0x00A36] = true, [0x00A59] = true,
    [0x00A5A] = true, [0x00A5B] = true, [0x00A5E] = true, [0x00B5C] = true,
    [0x00B5D] = true, [0x00F43] = true, [0x00F4D] = true, [0x00F52] = true,
    [0x00F57] = true, [0x00F5C] = true, [0x00F69] = true, [0x00F76] = true,
    [0x00F78] = true, [0x00F93] = true, [0x00F9D] = true, [0x00FA2] = true,
    [0x00FA7] = true, [0x00FAC] = true, [0x00FB9] = true, [0x0FB1D] = true,
    [0x0FB1F] = true, [0x0FB2A] = true, [0x0FB2B] = true, [0x0FB2C] = true,
    [0x0FB2D] = true, [0x0FB2E] = true, [0x0FB2F] = true, [0x0FB30] = true,
    [0x0FB31] = true, [0x0FB32] = true, [0x0FB33] = true, [0x0FB34] = true,
    [0x0FB35] = true, [0x0FB36] = true, [0x0FB38] = true, [0x0FB39] = true,
    [0x0FB3A] = true, [0x0FB3B] = true, [0x0FB3C] = true, [0x0FB3E] = true,
    [0x0FB40] = true, [0x0FB41] = true, [0x0FB43] = true, [0x0FB44] = true,
    [0x0FB46] = true, [0x0FB47] = true, [0x0FB48] = true, [0x0FB49] = true,
    [0x0FB4A] = true, [0x0FB4B] = true, [0x0FB4C] = true, [0x0FB4D] = true,
    [0x0FB4E] = true,
    [0x02ADC] = true, [0x1D15E] = true, [0x1D15F] = true, [0x1D160] = true,
    [0x1D161] = true, [0x1D162] = true, [0x1D163] = true, [0x1D164] = true,
    [0x1D1BB] = true, [0x1D1BC] = true, [0x1D1BD] = true, [0x1D1BE] = true,
    [0x1D1BF] = true, [0x1D1C0] = true,
  }

  for cp, decomp in next, decomposition_mapping do
    if #decomp > 1 and not (composition_exclusions[cp] or ccc[decomp[1]]) then
      local mapping = composition_mapping[decomp[1]]
      if not mapping then
        mapping = {}
        composition_mapping[decomp[1]] = mapping
      end
      mapping[decomp[2]] = cp
    end
  end

  local function fixup_decomp(decomp)
    local first = decomp[1]
    local first_decomp = decomposition_mapping[first]
    if not first_decomp then return false end
    if fixup_decomp(first_decomp) then
      print('nested', first)
    end
    move(decomp, 2, #decomp, #first_decomp + 1)
    move(first_decomp, 1, #first_decomp, 1, decomp)
    return true
  end
  -- Fixup stage
  for cp, decomp in next, decomposition_mapping do
    if fixup_decomp(decomp) then
      -- print(':(', cp)
    end
  end

  -- NFKD edition
  local DEBUG = false
  local function fixup_decomp(orig, decomp)
    local work
    local shared = decomposition_mapping[orig] == decomp
    local j = 0
    for i = 1, #decomp do
      local cp = decomp[i]
      local cp_decomp = compatibility_mapping[cp]
      if cp_decomp then
        if shared then
          local old = decomp
          decomp = {}
          compatibility_mapping[orig] = decomp
          move(old, 1, #old, 1, decomp)
        end
        decomp[i] = cp_decomp
        j = j + #cp_decomp
        work = true
      else
        j = j + 1
      end
    end
    if not work then return decomp end
    for i = #decomp, 1, -1 do
      local v = decomp[i]
      if type(v) == 'number' then
        decomp[j] = v
        j = j - 1
      else
        local count = #v
        move(v, 1, count, j - count + 1, decomp)
        j = j - count
      end
    end
    assert(j == 0)
    return decomp
  end
  -- Fixup stage
  for cp, decomp in next, compatibility_mapping do
    fixup_decomp(cp, decomp)
  end
end

local function ccc_reorder(codepoints, i, j, k)
  if k >= j then return end
  local first = codepoints[k]
  local first_ccc = ccc[first]
  if not first_ccc then
    return ccc_reorder(codepoints, k+1, j, k+1)
  end
  local new_pos = k
  local cur_ccc
  repeat
    new_pos = new_pos + 1
    if new_pos > j then break end
    local cur = codepoints[new_pos]
    cur_ccc = ccc[cur]
  until (not cur_ccc) or (cur_ccc >= first_ccc)
  new_pos = new_pos - 1
  if new_pos == k then
    return ccc_reorder(codepoints, i, j, k+1)
  end
  move(codepoints, k+1, new_pos, k)
  codepoints[new_pos] = first
  return ccc_reorder(codepoints, i, j, k == i and i or k-1)
end
function to_nfd_table(s, decomposition_mapping)
  local new_codepoints = newtable(#s, 0)
  local j = 1
  for _, c in codes(s) do
    local decomposed = decomposition_mapping[c]
    if decomposed then
      move(decomposed, 1, #decomposed, j, new_codepoints)
      j = j + #decomposed
    elseif c >= 0xAC00 and c <= 0xD7A3 then
      c = c - 0xAC00
      local tIndex = c % 28
      c = c // 28
      local vIndex = c % 21
      local lIndex = c // 21
      new_codepoints[j] = 0x1100 + lIndex
      new_codepoints[j+1] = 0x1161 + vIndex
      if tIndex == 0 then
        j = j + 2
      else
        new_codepoints[j+2] = 0x11A7 + tIndex
        j = j + 3
      end
    else
      new_codepoints[j] = c
      j = j + 1
    end
  end
  ccc_reorder(new_codepoints, 1, #new_codepoints, 1)
  return new_codepoints
end
local function to_nfd(s)
  return char(unpack(to_nfd_table(s, decomposition_mapping)))
end
local function to_nfkd(s)
  return char(unpack(to_nfd_table(s, compatibility_mapping)))
end
local function to_nfc_generic(s, decomposition_mapping)
  local codepoints = to_nfd_table(s, decomposition_mapping)
  local starter, lookup, last_ccc, lvt
  local j = 1
  for i, c in ipairs(codepoints) do
    local cur_ccc = ccc[c]
    if lookup then
      if (cur_ccc == nil) == (cur_ccc == last_ccc) then -- unblocked
        local composed = lookup[c]
        if composed then
          codepoints[starter] = composed
          lookup = composition_mapping[composed]
          goto CONTINUE
        end
      end
    elseif lvt then
      if lvt == 1 then
        if c >= 0x1161 and c <= 0x11A7 then
          lvt = 2
          codepoints[starter] = ((codepoints[starter] - 0x1100) * 21 + c - 0x1161) * 28 + 0xAC00
          goto CONTINUE
        end
      else -- if lvt == 2 then
        if c >= 0x11A8 and c <= 0x11C2 then
          lvt = nil
          codepoints[starter] = codepoints[starter] + c - 0x11A7
          goto CONTINUE
        end
      end
    end
    codepoints[j] = c
    lvt = nil
    if not cur_ccc then
      starter = j
      lookup = composition_mapping[c]
      if not lookup and c >= 0x1100 and c <= 0x1112 then
        lvt = 1
      end
    end
    j = j + 1
    last_ccc = cur_ccc
    ::CONTINUE::
  end
  for i = j,#codepoints do codepoints[i] = nil end
  return char(unpack(codepoints))
end
local function to_nfc(s)
  return to_nfc_generic(s, decomposition_mapping)
end
local function to_nfkc(s)
  return to_nfc_generic(s, compatibility_mapping)
end

return {
  NFD = to_nfd,
  NFC = to_nfc,
  NFKD = to_nfkd,
  NFKC = to_nfkc,
}
-- print(require'inspect'{to_nfd{0x1E0A}, to_nfc{0x1E0A}})

-- print(require'inspect'{to_nfd{0x1100, 0x1100, 0x1161, 0x11A8}, to_nfc{0x1100, 0x1100, 0x1161, 0x11A8}})