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--
-- luatexja/setwidth.lua
--
luatexbase.provides_module({
name = 'luatexja.setwidth',
date = '2011/06/28',
version = '0.1',
description = '',
})
module('luatexja.setwidth', package.seeall)
local err, warn, info, log = luatexbase.errwarinf(_NAME)
luatexja.load_module('base'); local ltjb = luatexja.base
luatexja.load_module('jfont'); local ltjf = luatexja.jfont
local node_type = node.type
local node_new = node.new
local node_tail = node.tail
local node_next = node.next
local has_attr = node.has_attribute
local set_attr = node.set_attribute
local node_insert_before = node.insert_before
local node_insert_after = node.insert_after
local round = tex.round
local id_glyph = node.id('glyph')
local id_kern = node.id('kern')
local id_hlist = node.id('hlist')
local id_vlist = node.id('vlist')
local id_rule = node.id('rule')
local id_math = node.id('math')
local attr_jchar_class = luatexbase.attributes['ltj@charclass']
local attr_curjfnt = luatexbase.attributes['ltj@curjfnt']
local attr_yablshift = luatexbase.attributes['ltj@yablshift']
local attr_icflag = luatexbase.attributes['ltj@icflag']
local attr_uniqid = luatexbase.attributes['ltj@uniqid']
local ltjf_font_metric_table = ltjf.font_metric_table
local PACKED = 2
char_data = {}
head = nil
-- return true if and only if p is a Japanese character node
local function is_japanese_glyph_node(p)
return p.font==has_attr(p, attr_curjfnt)
end
luatexbase.create_callback("luatexja.set_width", "data",
function (fstable, fmtable, jchar_class)
return fstable
end)
local fshift = { down = 0, left = 0}
-- mode: true iff p will be always encapsuled by a hbox
function capsule_glyph(p, dir, mode, met, class)
local h, box, q, fwidth
if char_data.width ~= 'prop' then
fwidth = char_data.width
else fwidth = p.width end
local fheight = char_data.height
local fdepth = char_data.depth
fshift.down = char_data.down; fshift.left = char_data.left
fshift = luatexbase.call_callback("luatexja.set_width", fshift, met, class)
-- local ti =
p.xoffset= p.xoffset - fshift.left
if mode or p.width ~= fwidth or p.height ~= fheight or p.depth ~= fdepth then
local y_shift = - p.yoffset + (has_attr(p,attr_yablshift) or 0)
p.yoffset = -fshift.down
head, q = node.remove(head, p)
local total = fwidth - p.width
if total == 0 then
h = p; p.next = nil
else
h = node_new(id_kern); h.subtype = 0
if char_data.align=='right' then
h.kern = total; p.next = nil; h.next = p
elseif char_data.align=='middle' then
h.kern = round(total/2); p.next = h
h = node_new(id_kern); h.subtype = 0
h.kern = total - round(total/2); h.next = p
else -- left
h.kern = total; p.next = h; h = p
end
end
box = node_new(id_hlist);
box.width = fwidth; box.height = fheight; box.depth = fdepth
box.glue_set = 0; box.glue_order = 0; box.head = h
box.shift = y_shift; box.dir = dir or 'TLT'
set_attr(box, attr_icflag, PACKED)
set_attr(box, attr_uniqid, has_attr(p, attr_uniqid) or 0)
if q then
head = node_insert_before(head, q, box)
else
head = node_insert_after(head, node_tail(head), box)
end
return q
else
p.yoffset = p.yoffset - (has_attr(p, attr_yablshift) or 0) - fshift.down
return node_next(p)
end
end
function set_ja_width(ahead, dir)
local p = ahead; head = ahead
local m = false -- is in math mode?
while p do
if p.id==id_glyph then
if is_japanese_glyph_node(p) then
local met = ltjf_font_metric_table[p.font]
local class = has_attr(p, attr_jchar_class)
char_data = ltjf.metrics[met.jfm].size_cache[met.size].char_type[class]
if char_data then
p = capsule_glyph(p, dir, false, met, class)
else
p = node_next(p)
end
else
p.yoffset = p.yoffset - (has_attr(p,attr_yablshift) or 0); p = node_next(p)
end
elseif p.id==id_math then
m = (p.subtype==0); p = node_next(p)
else
if m then
if p.id==id_hlist or p.id==id_vlist then
p.shift = p.shift + (has_attr(p,attr_yablshift) or 0)
elseif p.id==id_rule then
local v = has_attr(p,attr_yablshift) or 0
p.height = p.height - v; p.depth = p.depth + v
end
end
p = node_next(p)
end
end
-- adjust attr_icflag
tex.attribute[attr_icflag] = -(0x7FFFFFFF)
return head
end
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