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require('polyglossia') -- just in case...
local add_to_callback = luatexbase.add_to_callback
local remove_from_callback = luatexbase.remove_from_callback
local priority_in_callback = luatexbase.priority_in_callback
local next, type = next, type
local nodes, fonts, node = nodes, fonts, node
local nodecodes = nodes.nodecodes --- <= preloaded node.types()
local insert_node_before = node.insert_before
local insert_node_after = node.insert_after
local remove_node = nodes.remove
local copy_node = node.copy
local has_attribute = node.has_attribute
local end_of_math = node.end_of_math
if not end_of_math then -- luatex < .76
local traverse_nodes = node.traverse_id
local math_code = nodecodes.math
local end_of_math = function (n)
for n in traverse_nodes(math_code, n.next) do
return n
end
end
end
-- node types as of April 2013
local glyph_code = nodecodes.glyph
local penalty_code = nodecodes.penalty
local kern_code = nodecodes.kern
-- we make a new node, so that we can copy it later on
local penalty_node = node.new(penalty_code)
penalty_node.penalty = 50 -- corresponds to the penalty LaTeX sets at explicit hyphens
local function get_penalty_node()
return copy_node(penalty_node)
end
local xpgtibtattr = luatexbase.attributes['xpg@tibteol']
local tsheg = unicode.utf8.byte('་')
-- from typo-spa.lua
local function process(head)
local start = head
-- head is always begin of par (whatsit), so we have at least two prev nodes
-- penalty followed by glue
while start do
local id = start.id
if id == glyph_code then
local attr = has_attribute(start, xpgtibtattr)
if attr and attr > 0 then
if start.char == tsheg then
if start.next then
insert_node_after(head,start,get_penalty_node())
end
end
end
elseif id == math_code then
-- warning: this is a feature of luatex > 0.76
start = end_of_math(start) -- weird, can return nil .. no math end?
end
if start then
start = start.next
end
end
return head
end
local callback_name = "pre_linebreak_filter"
local function activate()
if not priority_in_callback (callback_name, "polyglossia-tibt.process") then
add_to_callback(callback_name, process, "polyglossia-tibt.process", 1)
end
end
local function desactivate()
if priority_in_callback (callback_name, "polyglossia-tibt.process") then
remove_from_callback(callback_name, "polyglossia-tibt.process")
end
end
polyglossia.activate_tibt_eol = activate
polyglossia.desactivate_tibt_eol = desactivate
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