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--
-- luatexja/stack.lua
--
luatexbase.provides_module({
name = 'luatexja.stack',
date = '2011/04/01',
version = '0.1',
description = 'LuaTeX-ja stack system',
})
module('luatexja.stack', package.seeall)
local err, warn, info, log = luatexbase.errwarinf(_NAME)
luatexja.load_module('base'); local ltjb = luatexja.base
local node_new = node.new
local id_whatsit = node.id('whatsit')
local sid_user = node.subtype('user_defined')
local hmode = 118 -- in luatexref-t.pdf, this must be 127
local charprop_stack_table={}; charprop_stack_table[0]={}
-- modified from table.fastcopy
local next = next
local function stack_table_copy_aux(old)
local new = {}
for i,v in next, old do
new[i] = v
end
return new
end
local function stack_table_copy(old)
if old then
local new = {}
for i,v in next, old do
new[i] = stack_table_copy_aux(v)
end
return new
else
return {}
end
end
function get_stack_level()
local i = tex.getcount('ltj@@stack')
local j = tex.currentgrouplevel
if j > tex.getcount('ltj@@group@level') then
i = i+1 -- new stack level
local gd = tex.globaldefs
if gd>0 then tex.globaldefs = 0 end
-- 'tex.globaldefs = 0' is local even if \globaldefs > 0.
tex.setcount('ltj@@group@level', j)
for k,v in pairs(charprop_stack_table) do -- clear the stack above i
if k>=i then charprop_stack_table[k]=nil end
end
charprop_stack_table[i] = stack_table_copy(charprop_stack_table[i-1])
tex.setcount('ltj@@stack', i)
if gd>0 then tex.globaldefs = gd end
if tex.nest[tex.nest.ptr].mode == hmode or
tex.nest[tex.nest.ptr].mode == -hmode then
local g = node_new(id_whatsit, sid_user)
g.user_id=30112; g.type=100; g.value=j; node.write(g)
end
end
return i
end
-- local function table_to_str(v)
-- local s = ''
-- for i, a in pairs(v) do
-- s = s .. i .. "=" .. tostring(a) .. ', '
-- end
-- return s
-- end
-- function print_stack_table(i)
-- print('\n>>> get_stack_level:')
-- for k, v in pairs(charprop_stack_table[i]) do
-- print(" " , k, type(k), table_to_str(v));
-- end
-- end
-- EXT
function set_stack_table(g,m,c,p,lb,ub)
local i = get_stack_level()
if p<lb or p>ub then
ltjb.package_error('luatexja',
"invalid code (".. p .. ")",
{"The code should in the range "..tostring(lb) ..'..'.. tostring(ub) .. ".",
"I'm going to use 0 instead of that illegal code value."})
p=0
elseif c<-1 or c>0x10ffff then
ltjb.package_error('luatexja',
'bad character code (' .. c .. ')',
{'A character number must be between -1 and 0x10ffff.',
"(-1 is used for denoting `math boundary')",
'So I changed this one to zero.'})
c=0
elseif not charprop_stack_table[i][m] then
charprop_stack_table[i][m] = {}
end
charprop_stack_table[i][m][c] = p
if g=='global' then
for j,v in pairs(charprop_stack_table) do
if not charprop_stack_table[j][m] then charprop_stack_table[j][m] = {} end
charprop_stack_table[j][m][c] = p
end
end
end
-- EXT
function set_stack_font(g,m,c,p)
local i = get_stack_level()
if c<0 or c>255 then
ltjb.package_error('luatexja',
"invalid family number (".. p .. ")",
{"The family number should in the range 0 .. 255.",
"I'm going to use 0 instead of that illegal family number."})
c=0
elseif not charprop_stack_table[i][m] then
charprop_stack_table[i][m] = {}
end
charprop_stack_table[i][m][c] = p
if g=='global' then
for j,v in pairs(charprop_stack_table) do
if not charprop_stack_table[j][m] then charprop_stack_table[j][m] = {} end
charprop_stack_table[j][m][c] = p
end
end
end
-- EXT: store \ltj@tempskipa
function set_stack_skip(g,m,sp)
local i = get_stack_level()
if not sp then return end
if not charprop_stack_table[i][m] then
charprop_stack_table[i][m] = {}
end
charprop_stack_table[i][m].width = sp.width
charprop_stack_table[i][m].stretch = sp.stretch
charprop_stack_table[i][m].shrink = sp.shrink
charprop_stack_table[i][m].stretch_order = sp.stretch_order
charprop_stack_table[i][m].shrink_order = sp.shrink_order
if g=='global' then
for j,v in pairs(charprop_stack_table) do
if not charprop_stack_table[j][m] then charprop_stack_table[j][m] = {} end
charprop_stack_table[j][m].width = sp.width
charprop_stack_table[j][m].stretch = sp.stretch
charprop_stack_table[j][m].shrink = sp.shrink
charprop_stack_table[j][m].stretch_order = sp.stretch_order
charprop_stack_table[j][m].shrink_order = sp.shrink_order
end
end
end
-- mode: nil iff it is called in callbacks
function get_skip_table(m, idx)
local i = charprop_stack_table[idx][m]
return i or { width = 0, stretch = 0, shrink = 0,
stretch_order = 0, shrink_order = 0 }
end
function get_penalty_table(m,c,d, idx)
local i = charprop_stack_table[idx][m]
if i then i=i[c] end
return i or d
end
-- EOF
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