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%D \module
%D [ file=s-lan-04,
%D version=2011.05.01,
%D title=\CONTEXT\ Style File,
%D subtitle=Language Environment 4,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
%D For Mojca.
\startluacode
local a_colormodel = attributes.private('colormodel')
local nodecodes = nodes.nodecodes
local nodepool = nodes.pool
local disc = nodecodes.disc
local glyph = nodecodes.glyph
local quads = fonts.hashes.quads
local newkern = nodepool.kern
local newrule = nodepool.rule
local newglue = nodepool.glue
local get_attribute = node.has_attribute
local tracers = nodes.tracers
local colortracers = tracers and tracers.colors
local setnodecolor = colortracers.set
local function identify(head,marked)
local current, prev = head, nil
while current do
local id = current.id
local next = current.next
if id == disc then
if prev and next.id == glyph then -- catch other usage of disc
marked[#marked+1] = prev
end
elseif id == glyph then
prev = current
end
current = next
end
end
local function strip(head,marked)
for i=1,#marked do
local prev = marked[i]
nodes.remove(head,prev.next,true)
end
end
local function mark(head,marked,what,how)
for i=1,#marked do
local prev = marked[i]
local font = prev.font
local quad = quads[font]
head, prev = node.insert_after(head,prev,newkern(-quad/40))
if what then
local rule = newrule(quad/20,.75*quad,0)
head, prev = node.insert_after(head,prev,rule)
setnodecolor(rule,how,get_attribute(prev,a_colormodel))
else
local rule = newrule(quad/20,0,.5*quad)
head, prev = node.insert_after(head,prev,rule)
setnodecolor(rule,how,get_attribute(prev,a_colormodel))
end
head, prev = node.insert_after(head,prev,newkern(-quad/40))
head, prev = node.insert_after(head,prev,newglue(0))
end
end
local language_one, language_two, tag_one, tag_two
function nodes.showhyphens(head)
local marked_1, marked_2 = { }, { }
if language_one then
for n in node.traverse_id(glyph,head) do
n.lang = language_one
end
lang.hyphenate(head,node.slide(head))
identify(head,marked_1)
strip(head,marked_1)
end
if language_two then
for n in node.traverse_id(glyph,head) do
n.lang = language_two
end
lang.hyphenate(head,node.slide(head))
identify(head,marked_2)
strip(head,marked_2)
end
if tag_one then
mark(head,marked_1,true,"hyphenation:"..tag_one)
end
if tag_two then
mark(head,marked_2,false,"hyphenation:"..tag_two)
end
return head, true
end
function languages.startcomparepatterns(list)
local list = utilities.parsers.settings_to_array(list)
tag_one = list[1]
tag_two = list[2]
language_one = tag_one and languages.getnumber(tag_one)
language_two = tag_two and languages.getnumber(tag_two)
-- nodes.tasks.appendaction("processors","words","nodes.showhyphens")
nodes.tasks.appendaction("processors","before","nodes.showhyphens")
nodes.tasks.enableaction("processors","nodes.showhyphens")
end
function languages.stopcomparepatterns()
nodes.tasks.disableaction("processors","nodes.showhyphens")
end
\stopluacode
\unprotect
\def\startcomparepatterns[#1]%
{\bgroup
\language\zerocount
\setupalign[\v!nothyphenated]%
\ctxlua{languages.startcomparepatterns("#1")}}
\def\stopcomparepatterns
{\ctxlua{languages.stopcomparepatterns()}%
\egroup}
\protect
\definecolor[hyphenation:en] [r=.8]
\definecolor[hyphenation:de] [g=.8]
\definecolor[hyphenation:nl] [b=.8]
\doifnotmode{demo}{\endinput}
\starttext
\startcomparepatterns[en,de]
\input tufte\par
\stopcomparepatterns
\startcomparepatterns[de,nl]
\input tufte\par
\stopcomparepatterns
\stoptext
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