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if not modules then modules = { } end modules ['lang-dis'] = {
version = 1.001,
comment = "companion to lang-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local concat = table.concat
local nodes = nodes
local tasks = nodes.tasks
local nuts = nodes.nuts
local nodepool = nuts.pool
local tonode = nuts.tonode
local tonut = nuts.tonut
local getfield = nuts.getfield
local setfield = nuts.setfield
local getnext = nuts.getnext
local getprev = nuts.getprev
local getid = nuts.getid
local getfont = nuts.getfont
local getattr = nuts.getattr
local getsubtype = nuts.getsubtype
local setsubtype = nuts.setsubtype
local getchar = nuts.getchar
local getdisc = nuts.getdisc
local setdisc = nuts.setdisc
local isglyph = nuts.isglyph
local copy_node = nuts.copy
local free_node = nuts.free
local remove_node = nuts.remove
local traverse_id = nuts.traverse_id
local traverse_nodes = nuts.traverse
local nodecodes = nodes.nodecodes
local disccodes = nodes.disccodes
local disc_code = nodecodes.disc
local glyph_code = nodecodes.glyph
local discretionary_code = disccodes.discretionary
local a_visualize = attributes.private("visualizediscretionary")
local setattribute = tex.setattribute
local getlanguagedata = languages.getdata
local check_regular = true
local expanders = {
[disccodes.discretionary] = function(d,template)
-- \discretionary
return template
end,
[disccodes.explicit] = function(d,template)
-- \-
local pre, post, replace = getdisc(d)
local done = false
if pre then
local char = isglyph(pre)
if char and char <= 0 then
done = true
pre = nil
end
end
if post then
local char = isglyph(post)
if char and char <= 0 then
done = true
post = nil
end
end
if done then
setdisc(d,pre,post,replace,discretionary_code,tex.exhyphenpenalty)
end
return template
end,
[disccodes.automatic] = function(d,template)
-- following a - : the pre and post chars are already appended and set
-- so we have pre=preex and post=postex .. however, the previous
-- hyphen is already injected ... downside: the font handler sees this
-- so this is another argument for doing a hyphenation pass in context
local pre, post, replace = getdisc(d)
if pre then
-- we have a preex characters and want that one to replace the
-- character in front which is the trigger
if not template then
-- can there be font kerns already?
template = getprev(d)
if template and getid(template) ~= glyph_code then
template = getnext(d)
if template and getid(template) ~= glyph_code then
template = nil
end
end
end
if template then
local pseudohead = getprev(template)
if pseudohead then
while template ~= d do
pseudohead, template, removed = remove_node(pseudohead,template)
-- free old replace ?
replace = removed
-- break ?
end
else
-- can't happen
end
setdisc(d,pre,post,replace,discretionary_code,tex.hyphenpenalty)
else
-- print("lone regular discretionary ignored")
end
else
setdisc(d,pre,post,replace,discretionary_code,tex.hyphenpenalty)
end
return template
end,
[disccodes.regular] = function(d,template)
if check_regular then
-- simple
if not template then
-- can there be font kerns already?
template = getprev(d)
if template and getid(template) ~= glyph_code then
template = getnext(d)
if template and getid(template) ~= glyph_code then
template = nil
end
end
end
if template then
local language = template and getfield(template,"lang")
local data = getlanguagedata(language)
local prechar = data.prehyphenchar
local postchar = data.posthyphenchar
local pre, post, replace = getdisc(d) -- pre can be set
local done = false
if prechar and prechar > 0 then
done = true
pre = copy_node(template)
setchar(pre,prechar)
end
if postchar and postchar > 0 then
done = true
post = copy_node(template)
setchar(post,postchar)
end
if done then
setdisc(d,pre,post,replace,discretionary_code,tex.hyphenpenalty)
end
else
-- print("lone regular discretionary ignored")
end
return template
else
-- maybe also set penalty here
setsubtype(d,discretionary_code)
end
end,
[disccodes.first] = function()
-- forget about them
end,
[disccodes.second] = function()
-- forget about them
end,
}
languages.expanders = expanders
function languages.expand(d,template,subtype)
if not subtype then
subtype = getsubtype(d)
end
if subtype ~= discretionary_code then
return expanders[subtype](d,template)
end
end
local setlistcolor = nodes.tracers.colors.setlist
function languages.visualizediscretionaries(head)
for d in traverse_id(disc_code,tonut(head)) do
if getattr(d,a_visualize) then
local pre, post, replace = getdisc(d)
if pre then
setlistcolor(pre,"darkred")
end
if post then
setlistcolor(post,"darkgreen")
end
if replace then
setlistcolor(replace,"darkblue")
end
end
end
end
local enabled = false
function languages.showdiscretionaries(v)
if v == false then
setattribute(a_visualize,unsetvalue)
else -- also nil
if not enabled then
nodes.tasks.enableaction("processors","languages.visualizediscretionaries")
enabled = true
end
setattribute(a_visualize,1)
end
end
interfaces.implement {
name = "showdiscretionaries",
actions = languages.showdiscretionaries
}
local toutf = nodes.listtoutf
function languages.serializediscretionary(d) -- will move to tracer
local pre, post, replace = getdisc(d)
return string.formatters["{%s}{%s}{%s}"](
pre and toutf(pre) or "",
post and toutf(post) or "",
replace and toutf(replace) or ""
)
end
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