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--
-- ltj-charrange.lua
--
luatexbase.provides_module({
name = 'luatexja.charrange',
date = '2020-07-30',
description = 'Handling the range of Japanese characters',
})
luatexja.charrange = {}
luatexja.load_module 'base'; local ltjb = luatexja.base
local getchar = node.direct.getchar
local has_attr = node.direct.has_attribute
local has_attr_node = node.has_attribute
local tex_getattr = tex.getattribute
local ATTR_RANGE = 7
luatexja.charrange.ATTR_RANGE = ATTR_RANGE
local jcr_cjk, jcr_noncjk = 0, 1
local floor = math.floor
local kcat_attr_table = {}
local pow_table = {}
local fn_table = {} -- used in is_ucs_in_japanese_char_direct
local nfn_table = {} -- used in is_ucs_in_japanese_char_node
for i = 0, 31*ATTR_RANGE-1 do
local ka, pw = luatexbase.attributes['ltj@kcat'..floor(i/31)], 1/(2^(i%31))
local jcr_noncjk = jcr_noncjk
kcat_attr_table[i], pow_table[i] = ka, 2^(i%31)
fn_table[i] = function(p) return floor(has_attr(p, ka)*pw)%2 ~= jcr_noncjk end
nfn_table[i] = function(p) return floor(has_attr_node(p, ka)*pw)%2 ~= jcr_noncjk end
end
fn_table[-1] = function() return false end -- for char --U+007F
nfn_table[-1] = function() return false end -- for char --U+007F
pow_table[31*ATTR_RANGE] = 2^31
-- jcr_table_main[chr_code] = index
-- index : internal 0, 1, 2, ..., 216 0: 'other'
-- external 217, 1 2 216, 217 and (out of range): 'other'
-- initialize
local jcr_table_main = {}
local ucs_out = 0x110000
for i=0x0 ,0x7F do jcr_table_main[i]=-1 end
for i=0x80 ,0xFF do jcr_table_main[i]=1 end
for i=0x100,ucs_out-1 do jcr_table_main[i]=0 end
-- EXT: add characters to a range
function luatexja.charrange.add_char_range(b,e,ind) -- ind: external range number
if not ind or ind<0 or ind>31*ATTR_RANGE then -- 0 はエラーにしない（隠し）
ltjb.package_error('luatexja',
"invalid character range number (" .. ind .. ")",
"A character range number should be in the range 1.."
.. 31*ATTR_RANGE .. ",\n" ..
"ignored.")
return
elseif b<0x80 or e>=ucs_out then
ltjb.package_warning('luatexja',
'bad character range ([' .. b .. ',' .. e .. ']). ' ..
'I take the intersection with [0x80, 0x10ffff].')
elseif b>e then b, e = e, b end
if ind == 31*ATTR_RANGE then ind=0 end
for i=math.max(0x80,b),math.min(ucs_out-1,e) do
jcr_table_main[i]=ind
end
end
function luatexja.charrange.char_to_range(c) -- return the external range number
local r = jcr_table_main[ltjb.in_unicode(c, false)] or 217
return (r~=0) and r or 217
end
local function get_range_setting(i) -- i: internal range number
return floor(tex_getattr(kcat_attr_table[i])/pow_table[i])%2
end
-- glyph_node p は和文文字か？
function luatexja.charrange.is_ucs_in_japanese_char(p)
return nfn_table[jcr_table_main[c or p.char]](p)
end
function luatexja.charrange.is_ucs_in_japanese_char_direct(p ,c)
return fn_table[jcr_table_main[c or getchar(p)]](p)
end
function luatexja.charrange.is_japanese_char_curlist(c) -- assume that c>=0x80
return get_range_setting(jcr_table_main[c])~= jcr_noncjk
end
-- EXT
function luatexja.charrange.toggle_char_range(g, i) -- i: external range number
if type(i)~='number' then
ltjb.package_error('luatexja',
"invalid character range number (" .. tostring(i).. ")",
"A character range number must be a number, ignored.")
elseif i==0 then return
else
local kc
if i>0 then kc=0 else kc=1; i=-i end
if i>=31*ATTR_RANGE then i=0 end
local attr = kcat_attr_table[i]
local a = tex_getattr(attr)
tex.setattribute(g, attr,
(floor(a/pow_table[i+1])*2+kc)*pow_table[i]+a%pow_table[i])
end
end
luatexja.charrange.get_range_setting=get_range_setting
-- EOF
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