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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 STCK = luatexja.userid_table.STCK
hmode = 0 -- dummy
charprop_stack_table={};
local charprop_stack_table = charprop_stack_table
charprop_stack_table[0]={}
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] = table.fastcopy(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=STCK; 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 type(p)~='number' or p<lb or p>ub then
ltjb.package_error('luatexja',
"invalid code (".. tostring(p) .. ")",
"The code should in the range "..tostring(lb) .. '..' ..
tostring(ub) .. ".\n" ..
"I'm going to use 0 instead of that illegal code value.")
p=0
elseif type(c)~='number' or c<-1 or c>0x10ffff then
ltjb.package_error('luatexja',
'bad character code (' .. tostring(c) .. ')',
'A character number must be between -1 and 0x10ffff.\n' ..
"(-1 is used for denoting `math boundary')\n" ..
'So I changed this one to zero.')
c=0
end
charprop_stack_table[i][c+m] = p
if g=='global' then
for j,v in pairs(charprop_stack_table) do
charprop_stack_table[j][c+m] = p
end
end
end
-- EXT
function set_stack_font(g,m,c,p)
local i = get_stack_level()
if type(c)~='number' or c<0 or c>255 then
ltjb.package_error('luatexja',
"invalid family number (".. tostring(c) .. ")",
"The family number should in the range 0 .. 255.\n" ..
"I'm going to use 0 instead of that illegal family number.")
c=0
end
charprop_stack_table[i][c+m] = p
if g=='global' then
for j,v in pairs(charprop_stack_table) do
charprop_stack_table[j][c+m] = 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
-- These three functions are used in ltj-jfmglue.lua.
function report_stack_level(bsl)
table_current_stack = charprop_stack_table[bsl]
end
function fast_get_skip_table(m)
return table_current_stack[m]
or { width = 0, stretch = 0, shrink = 0, stretch_order = 0, shrink_order = 0 }
end
-- For other situations, use the following instead:
function get_skip_table(m, idx)
return charprop_stack_table[idx][m]
or { width = 0, stretch = 0, shrink = 0, stretch_order = 0, shrink_order = 0 }
end
function get_penalty_table(mc, d, idx)
local i = charprop_stack_table[idx][mc]
return i or d
end
-- EOF
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