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--
-- luatexja/charrange.lua
--
luatexbase.provides_module({
name = 'luatexja.charrange',
date = '2011/04/01',
version = '0.1',
description = 'Handling the range of Japanese characters',
})
module('luatexja.charrange', package.seeall)
local err, warn, info, log = luatexbase.errwarinf(_NAME)
luatexja.load_module('base'); local ltjb = luatexja.base
local floor = math.floor
local has_attr = node.has_attribute
-- jcr_table_main[chr_code] = index
-- index : internal 0, 1, 2, ..., 216 0: 'other'
-- external 1 2 216, (out of range): 'other'
-- initialize
local jcr_table_main = {}
local jcr_cjk = 0; local jcr_noncjk = 1; local ucs_out = 0x110000
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 add_char_range(b,e,ind) -- ind: external range number
if not ind or ind<0 or ind>216 then -- 0 は error 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..216,",
"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
local j=b; e=b; b=j
end
for i=math.max(0x80,b),math.min(ucs_out-1,e) do
jcr_table_main[i]=ind
end
end
function char_to_range(c) -- return the (external) range number
if not c or c<0 or c>0x10FFFF then
ltjb.package_error('luatexja',
'bad character code (' .. tostring(c) .. ')',
{'A character number must be between 0 and 0x10ffff.',
'So I changed this one to zero.'})
c=0
elseif c<0x80 then return -1
else
local i = jcr_table_main[c] or 0
if i==0 then return 217 else return i end
end
end
function get_range_setting(i) -- i: internal range number
return floor(tex.getattribute(
luatexbase.attributes['ltj@kcat'..floor(i/31)])
/math.pow(2, i%31))%2
end
-- glyph_node p は和文文字か?
function is_ucs_in_japanese_char(p)
local c = p.char
if c<0x80 then return false
else
local i=jcr_table_main[c]
return (floor(
has_attr(p, luatexbase.attributes['ltj@kcat'..floor(i/31)])
/math.pow(2, i%31))%2 ~= jcr_noncjk)
end
end
-- EXT
function 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>216 then i=0 end
local attr = luatexbase.attributes['ltj@kcat'..floor(i/31)]
local a = tex.getattribute(attr)
local k = math.pow(2, i%31)
tex.setattribute(g,attr,(floor(a/k/2)*2+kc)*k+a%k)
end
end
-- EOF
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