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if not modules then modules = { } end modules ['typo-spa'] = {
version = 1.001,
comment = "companion to typo-spa.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local next, type = next, type
local trace_spacing = false trackers.register("typesetters.spacing", function(v) trace_spacing = v end)
local report_spacing = logs.reporter("typesetting","spacing")
local nodes, fonts, node = nodes, fonts, node
local fonthashes = fonts.hashes
local quaddata = fonthashes.quads
local texsetattribute = tex.setattribute
local unsetvalue = attributes.unsetvalue
local v_reset = interfaces.variables.reset
local nuts = nodes.nuts
local getnext = nuts.getnext
local getprev = nuts.getprev
local getattr = nuts.getattr
local isglyph = nuts.isglyph
local insertnodebefore = nuts.insertbefore
local insertnodeafter = nuts.insertafter
local remove_node = nuts.remove
local endofmath = nuts.endofmath
local unsetattributes = nuts.unsetattributes
local findattribute = nuts.findattribute
local nodepool = nuts.pool
local new_penalty = nodepool.penalty
local new_glue = nodepool.glue
local nodecodes = nodes.nodecodes
local math_code = nodecodes.math
local somespace = nodes.somespace
local somepenalty = nodes.somepenalty
local enableaction = nodes.tasks.enableaction
typesetters = typesetters or { }
local typesetters = typesetters
typesetters.spacings = typesetters.spacings or { }
local spacings = typesetters.spacings
spacings.mapping = spacings.mapping or { }
spacings.numbers = spacings.numbers or { }
local a_spacings = attributes.private("spacing")
storage.register("typesetters/spacings/mapping", spacings.mapping, "typesetters.spacings.mapping")
local mapping = spacings.mapping
local numbers = spacings.numbers
for i=1,#mapping do
local m = mapping[i]
numbers[m.name] = m
end
-- todo cache lastattr
function spacings.handler(head)
local _, start = findattribute(head, a_spacings)
if start then
local done = false
-- head is always begin of par (whatsit), so we have at least two prev nodes
-- penalty followed by glue
while start do
local char, id = isglyph(start)
if char then
local attr = getattr(start,a_spacings)
if attr and attr > 0 then
local data = mapping[attr]
if data then
local map = data.characters[char]
if map then
local font = id
local left = map.left
local right = map.right
local alternative = map.alternative
local quad = quaddata[font]
local prev = getprev(start)
if left and left ~= 0 and prev then
local ok = false
local prevprev = getprev(prev)
if alternative == 1 then
if somespace(prev,true) then
if somepenalty(prevprev,10000) then
if trace_spacing then
report_spacing("removing penalty and space before %C (left)",char)
end
head = remove_node(head,prev,true)
head = remove_node(head,prevprev,true)
else
if trace_spacing then
report_spacing("removing space before %C (left)",char)
end
head = remove_node(head,prev,true)
end
end
ok = true
else
ok = not (somespace(prev,true) and somepenalty(prevprev,true)) or somespace(prev,true)
end
if ok then
if trace_spacing then
report_spacing("inserting penalty and space before %C (left)",char)
end
insertnodebefore(head,start,new_penalty(10000))
insertnodebefore(head,start,new_glue(left*quad))
end
end
local next = getnext(start)
if right and right ~= 0 and next then
local ok = false
local nextnext = getnext(next)
if alternative == 1 then
if somepenalty(next,10000) then
if somespace(nextnext,true) then
if trace_spacing then
report_spacing("removing penalty and space after %C right",char)
end
head = remove_node(head,next,true)
head = remove_node(head,nextnext,true)
end
elseif somespace(next,true) then
if trace_spacing then
report_spacing("removing space after %C (right)", char)
end
head = remove_node(head,next,true)
end
ok = true
else
ok = not (somepenalty(next,10000) and somespace(nextnext,true)) or somespace(next,true)
end
if ok then
if trace_spacing then
report_spacing("inserting penalty and space after %C (right)",char)
end
insertnodeafter(head,start,new_glue(right*quad))
insertnodeafter(head,start,new_penalty(10000))
end
end
end
end
done = true
end
elseif id == math_code then
start = endofmath(start) -- weird, can return nil .. no math end?
end
if start then
start = getnext(start)
end
end
if done then
-- unsetattributes(a_spacings,head)
end
end
return head
end
local enabled = false
function spacings.define(name)
local data = numbers[name]
if data then
-- error
else
local number = #mapping + 1
local data = {
name = name,
number = number,
characters = { },
}
mapping[number] = data
numbers[name] = data
end
end
function spacings.setup(name,char,settings)
local data = numbers[name]
if not data then
-- error
else
data.characters[char] = settings
end
end
function spacings.set(name)
local n = unsetvalue
if name ~= v_reset then
local data = numbers[name]
if data then
if not enabled then
enableaction("processors","typesetters.spacings.handler")
enabled = true
end
n = data.number or unsetvalue
end
end
texsetattribute(a_spacings,n)
end
function spacings.reset()
texsetattribute(a_spacings,unsetvalue)
end
-- interface
local implement = interfaces.implement
implement {
name = "definecharacterspacing",
actions = spacings.define,
arguments = "string"
}
implement {
name = "setupcharacterspacing",
actions = spacings.setup,
arguments = {
"string",
"integer",
{
{ "left", "number" },
{ "right", "number" },
{ "alternative", "integer" },
}
}
}
implement {
name = "setcharacterspacing",
actions = spacings.set,
arguments = "string"
}
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