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if not modules then modules = { } end modules ['typo-sus'] = {
version = 1.001,
comment = "companion to typo-sus.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local punctuation = {
po = true,
}
local openquote = {
ps = true,
pi = true,
}
local closequote = {
pe = true,
pf = true,
}
local categories = characters.categories
local nodecodes = nodes.nodecodes
local glyph_code = nodecodes.glyph
local kern_code = nodecodes.kern
local penalty_code = nodecodes.penalty
local glue_code = nodecodes.glue
local math_code = nodecodes.math
local hlist_code = nodecodes.hlist
local nuts = nodes.nuts
local tonut = nodes.tonut
local tonode = nodes.tonode
local getid = nuts.getid
local getchar = nuts.getchar
local getprev = nuts.getprev
local getnext = nuts.getnext
local getfield = nuts.getfield
local getattr = nuts.getattr
local getfont = nuts.getfont
local setcolor = nodes.tracers.colors.set
local insert_before = nuts.insert_before
local insert_after = nuts.insert_after
local end_of_math = nuts.end_of_math
local nodepool = nuts.pool
local new_rule = nodepool.rule
local new_kern = nodepool.kern
local new_penalty = nodepool.penalty
local a_characters = attributes.private("characters")
local threshold = 65536 / 4
local function special(n)
if n then
local id = getid(n)
if id == kern_code then
local kern = getfield(n,"kern")
return kern < threshold
elseif id == penalty_code then
return true
elseif id == glue_code then
local width = getfield(getfield(n,"spec"),"width")
return width < threshold
elseif id == hlist_code then
local width = getfield(n,"width")
return width < threshold
end
else
return false
end
end
local function goback(current)
local prev = getprev(current)
while prev and special(prev) do
prev = getprev(prev)
end
if prev then
return prev, getid(prev)
end
end
local function goforward(current)
local next = getnext(current)
while next and special(next) do
next = getnext(next)
end
if next then
return next, getid(next)
end
end
local function mark(head,current,id,color)
if id == glue_code then
-- the glue can have stretch and/or shrink so the rule can overlap with the
-- following glyph .. no big deal as that one then sits on top of the rule
local width = getfield(getfield(current,"spec"),"width")
local rule = new_rule(width)
local kern = new_kern(-width)
head = insert_before(head,current,rule)
head = insert_before(head,current,kern)
setcolor(rule,color)
elseif id == kern_code then
local width = getfield(current,"kern")
local rule = new_rule(width)
local kern = new_kern(-width)
head = insert_before(head,current,rule)
head = insert_before(head,current,kern)
setcolor(rule,color)
else
local width = getfield(current,"width")
local rule = new_rule(width,getfield(current,"height"),getfield(current,"depth"))
local kern = new_kern(-width)
head = insert_before(head,current,rule)
head = insert_before(head,current,kern)
setcolor(rule,color)
setcolor(current,"white")
end
return head, current
end
-- we can cache the font and skip ahead to next but it doesn't
-- save enough time and it makes the code looks bad too ... after
-- all, we seldom use this
function typesetters.showsuspects(head)
local head = tonut(head)
local current = head
local lastdone = nil
while current do
local id = getid(current)
if id == glyph_code then
local char = getchar(current)
local code = categories[char]
local done = false
if punctuation[code] then
local prev, pid = goback(current)
if prev and pid == glue_code then
done = "darkblue"
elseif prev and pid == math_code then
done = "darkgray"
else
local next, nid = goforward(current)
if next and nid ~= glue_code then
done = "darkblue"
end
end
elseif openquote[code] then
local next, nid = goforward(current)
if next and nid == glue_code then
done = "darkred"
end
elseif closequote[code] then
local prev, pid = goback(current)
if prev and pid == glue_code then
done = "darkred"
end
else
local prev, pid = goback(current)
if prev then
if pid == math_code then
done = "darkgray"
elseif pid == glyph_code and getfont(current) ~= getfont(prev) then
if lastdone ~= prev then
done = "darkgreen"
end
end
end
if not done then
local next, nid = goforward(current)
if next then
if nid == math_code then
done = "darkgray"
elseif nid == glyph_code and getfont(current) ~= getfont(next) then
if lastdone ~= prev then
done = "darkgreen"
end
end
end
end
end
if done then
head = mark(head,current,id,done)
lastdone = current
end
current = getnext(current)
elseif id == math_code then
current = getnext(end_of_math(current))
elseif id == glue_code then
local a = getattr(current,a_characters)
if a then
local prev = getprev(current)
local prid = prev and getid(prev)
if prid == penalty_code and getfield(prev,"penalty") == 10000 then
head = mark(head,current,id,"orange")
head = insert_before(head,current,new_penalty(10000))
else
head = mark(head,current,id,"darkmagenta")
end
end
current = getnext(current)
else
current = getnext(current)
end
end
return tonode(head), false
end
nodes.tasks.appendaction("processors","after","typesetters.showsuspects")
nodes.tasks.disableaction("processors","typesetters.showsuspects")
-- or maybe a directive
trackers.register("typesetters.suspects",function(v)
nodes.tasks.setaction("processors","typesetters.showsuspects",v)
end)
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