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--
-- luatexja/pretreat.lua
--
luatexbase.provides_module({
name = 'luatexja.pretreat',
date = '2012/07/19',
version = '0.2',
description = '',
})
module('luatexja.pretreat', package.seeall)
local err, warn, info, log = luatexbase.errwarinf(_NAME)
luatexja.load_module('charrange'); local ltjc = luatexja.charrange
luatexja.load_module('jfont'); local ltjf = luatexja.jfont
luatexja.load_module('stack'); local ltjs = luatexja.stack
local floor = math.floor
local has_attr = node.has_attribute
local set_attr = node.set_attribute
local node_traverse = node.traverse
local node_type = node.type
local node_remove = node.remove
local node_next = node.next
local node_free = node.free
local tex_getcount = tex.getcount
local id_glyph = node.id('glyph')
local id_math = node.id('math')
local id_whatsit = node.id('whatsit')
local sid_user = node.subtype('user_defined')
local attr_curjfnt = luatexbase.attributes['ltj@curjfnt']
local attr_icflag = luatexbase.attributes['ltj@icflag']
local ltjf_font_metric_table = ltjf.font_metric_table
local ltjc_is_ucs_in_japanese_char = ltjc.is_ucs_in_japanese_char
local attr_orig_char = luatexbase.attributes['ltj@origchar']
------------------------------------------------------------------------
-- MAIN PROCESS STEP 1: replace fonts
------------------------------------------------------------------------
local wt
local function suppress_hyphenate_ja(head)
local non_math, p = true, head
wt = {}
while p do
local pid = p.id
if pid == id_glyph then
if (has_attr(p, attr_icflag) or 0)<=0 and ltjc_is_ucs_in_japanese_char(p) then
p.font = has_attr(p, attr_curjfnt) or p.font
p.subtype = floor(p.subtype*0.5)*2
set_attr(p, attr_orig_char, p.char)
end
elseif pid == id_math then
p = node_next(p) -- skip math on
while p and p.id~=id_math do p = node_next(p) end
elseif pid == id_whatsit and p.subtype==sid_user and p.user_id==30112 then
wt[#wt+1] = p; head = node_remove(head, p)
end
p = node_next(p)
end
lang.hyphenate(head)
return head
end
-- mode: true iff this function is called from hpack_filter
function set_box_stack_level(head, mode)
local box_set, cl = 0, tex.currentgrouplevel + 1
for _,p in pairs(wt) do
if mode and p.value==cl then box_set = 1 end; node_free(p)
end
ltjs.report_stack_level(tex_getcount('ltj@@stack') + box_set)
return head
end
-- CALLBACKS
luatexbase.add_to_callback('hpack_filter',
function (head)
return set_box_stack_level(head, true)
end,'ltj.hpack_filter_pre',1)
luatexbase.add_to_callback('pre_linebreak_filter',
function (head)
return set_box_stack_level(head, false)
end,'ltj.pre_linebreak_filter_pre',1)
luatexbase.add_to_callback('hyphenate',
function (head,tail)
return suppress_hyphenate_ja(head)
end,'ltj.hyphenate')
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