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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
commite0c6872cf40896c7be36b11dcc744620f10adf1d (patch)
tree60335e10d2f4354b0674ec22d7b53f0f8abee672 /macros/luatex/generic/luatexja/src/ltj-charrange.lua
Initial commit
Diffstat (limited to 'macros/luatex/generic/luatexja/src/ltj-charrange.lua')
-rw-r--r--macros/luatex/generic/luatexja/src/ltj-charrange.lua112
1 files changed, 112 insertions, 0 deletions
diff --git a/macros/luatex/generic/luatexja/src/ltj-charrange.lua b/macros/luatex/generic/luatexja/src/ltj-charrange.lua
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+++ b/macros/luatex/generic/luatexja/src/ltj-charrange.lua
@@ -0,0 +1,112 @@
+--
+-- luatexja/charrange.lua
+--
+luatexbase.provides_module({
+ name = 'luatexja.charrange',
+ date = '2019/04/01',
+ 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
+ local j=b; e=b; b=j
+ 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>=7*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