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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 get_quad = luaotfload.aux.get_quad -- needs luaotfload > 20130516
local next, type = next, type
local nodes, fonts, node = nodes, fonts, node
local nodecodes = nodes.nodecodes
local insert_node_before = node.insert_before
local insert_node_after = node.insert_after
local remove_node = nodes.remove
local has_attribute = node.has_attribute
local node_copy = node.copy
local new_node = node.new
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 according to node.types()
local glue_code = nodecodes.glue
local glue_spec_code = nodecodes.glue_spec
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 = new_node(penalty_code)
penalty_node.penalty = 10000
local function get_penalty_node()
return node_copy(penalty_node)
end
-- same for glue node
local kern_node = new_node(kern_code)
local function get_kern_node(dim)
local n = node_copy(kern_node)
n.kern = dim
return n
end
-- we have here all possible space characters, referenced by their
-- unicode slot number, taken from char-def.lua
local space_chars = {[32]=1, [160]=1, [5760]=1, [6158]=1, [8192]=1, [8193]=1, [8194]=1, [8195]=1,
[8196]=1, [8197]=1, [8198]=1, [8199]=1, [8200]=1, [8201]=1, [8202]=1, [8239]=1, [8287]=1, [12288]=1}
-- from nodes-tst.lua, adapted
local function somespace(n,all)
if n then
local id = n.id
if id == glue_code then
return (all or (n.spec.width ~= 0)) and glue_code
elseif id == kern_code then
return (all or (n.kern ~= 0)) and kern_code
elseif id == glyph_code then
if space_chars[n.char] then
return true
else
return false
end
end
end
return false
end
-- idem
local function somepenalty(n,value)
if n then
local id = n.id
if id == penalty_code then
if value then
return n.penalty == value
else
return true
end
end
end
return false
end
local xpgfrptattr = luatexbase.attributes['xpg@frpt']
local left=1
local right=2
local byte = unicode.utf8.byte
-- Now there is a good question: how do we now, in lua, what a \thinspace is?
-- In the LaTeX source (ltspace.dtx) it is defined as:
-- \def\thinspace{\kern .16667em }. I see no way of seeing if it has been
-- overriden or not... So we stick to this value.
local thinspace = 0.16667
-- thickspace is defined in amsmath.sty as:
-- \renewcommand{\;}{\mspace+\thickmuskip{.2777em}}. Same problem as above, we
-- stick to this fixed value.
local thickspace = 0.2777 -- 5/18
local mappings = {
[byte(':')] = {left, thickspace}, --really?
[byte('!')] = {left, thinspace},
[byte('?')] = {left, thinspace},
[byte(';')] = {left, thinspace},
[byte('‼')] = {left, thinspace},
[byte('⁇')] = {left, thinspace},
[byte('⁈')] = {left, thinspace},
[byte('⁉')] = {left, thinspace},
[byte('»')] = {left, thinspace},
[byte('›')] = {left, thinspace},
[byte('«')] = {right, thinspace},
[byte('‹')] = {right, thinspace},
}
local function set_spacings(thinsp, thicksp)
for _, m in pairs(mappings) do
if m[2] == thinspace then
m[2] = thinsp
elseif m[2] == thickspace then
m[2] = thicksp
end
end
thickspace = thicksp
thinspace = thinsp
end
-- from typo-spa.lua
local function process(head)
local done = false
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, xpgfrptattr)
if attr and attr > 0 then
local char = start.char
local map = mappings[char]
--node.unset_attribute(start, xpgfrptattr) -- needed?
if map then
local quad = get_quad(start.font) -- might be optimized
local prev = start.prev
if map[1] == left and prev then
local prevprev = prev.prev
local somespace = somespace(prev,true)
-- TODO: there is a question here: do we override a preceding space or not?...
if somespace then
local somepenalty = somepenalty(prevprev,10000)
if somepenalty then
head = remove_node(head,prev,true)
head = remove_node(head,prevprev,true)
else
head = remove_node(head,prev,true)
end
end
insert_node_before(head,start,get_penalty_node())
insert_node_before(head,start,get_kern_node(map[2]*quad))
done = true
end
local next = start.next
if map[1] == right and next then
local nextnext = next.next
local somepenalty = somepenalty(next,10000)
if somepenalty then
local somespace = somespace(nextnext,true)
if somespace then
head = remove_node(head,next,true)
head = remove_node(head,nextnext,true)
end
else
local somespace = somespace(next,true)
if somespace then
head = remove_node(head,next,true)
end
end
insert_node_after(head,start,get_kern_node(map[2]*quad))
insert_node_after(head,start,get_penalty_node())
done = true
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, done
end
local callback_name = "pre_linebreak_filter"
local function activate()
if not priority_in_callback (callback_name, "polyglossia-frpt.process") then
add_to_callback(callback_name, process, "polyglossia-frpt.process", 1)
end
end
local function desactivate()
if priority_in_callback (callback_name, "polyglossia-frpt.process") then
remove_from_callback(callback_name, "polyglossia-frpt.process")
end
end
polyglossia.activate_frpt = activate
polyglossia.desactivate_frpt = desactivate
polyglossia.set_spacings = set_spacings
polyglossia.thinspace = thinspace
polyglossia.thickspace = thickpace
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