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|
if not modules then modules = { } end modules ['typo-rub'] = {
version = 1.001,
comment = "companion to typo-rub.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- todo: recycle slots better
-- todo: hoffset
-- todo: auto-increase line height
-- todo: only hpack when start <> stop
-- A typical bit of afternoon hackery ... with some breaks for watching
-- Ghost-Note on youtube (Robert Searight and Nate Werth) ... which expands
-- my to-be-had cd/dvd list again.
local lpegmatch = lpeg.match
local utfcharacters = utf.characters
local setmetatableindex = table.setmetatableindex
local variables = interfaces.variables
local implement = interfaces.implement
local texsetattribute = tex.setattribute
local v_flushleft = variables.flushleft
local v_middle = variables.middle
local v_flushright = variables.flushright
local v_yes = variables.yes
local v_no = variables.no
local v_auto = variables.auto
local nuts = nodes.nuts
local getid = nuts.getid
local getsubtype = nuts.getsubtype
local getattr = nuts.getattr
local setattr = nuts.setattr
local getnext = nuts.getnext
local setnext = nuts.setnext
local getprev = nuts.getprev
local setprev = nuts.setprev
local setlink = nuts.setlink
local getlist = nuts.getlist
local setlist = nuts.setlist
local setshift = nuts.setshift
local getwidth = nuts.getwidth
local setwidth = nuts.setwidth
local hpack = nuts.hpack
local insert_after = nuts.insert_after
local takebox = nuts.takebox
local nexthlist = nuts.traversers.hlist
local nextvlist = nuts.traversers.vlist
local nodecodes = nodes.nodecodes
local glyph_code = nodecodes.glyph
local disc_code = nodecodes.disc
local kern_code = nodecodes.kern
local glue_code = nodecodes.glue
local penalty_code = nodecodes.penalty
local hlist_code = nodecodes.hlist
local vlist_code = nodecodes.vlist
local localpar_code = nodecodes.localpar
local dir_code = nodecodes.dir
local kerncodes = nodes.kerncodes
local fontkern_code = kerncodes.font
local nodepool = nuts.pool
local new_kern = nodepool.kern
local setprop = nuts.setprop
local getprop = nuts.getprop
local enableaction = nodes.tasks.enableaction
local nofrubies = 0
local rubylist = { }
local a_ruby = attributes.private("ruby")
local rubies = { }
typesetters.rubies = rubies
local trace_rubies = false trackers.register("typesetters.rubies",function(v) trace_rubies = v end)
local report_rubies = logs.reporter("rubies")
do
local shared = nil
local splitter = lpeg.tsplitat("|")
local function enable()
enableaction("processors","typesetters.rubies.check")
enableaction("shipouts", "typesetters.rubies.attach")
enable = false
end
local ctx_setruby = context.core.setruby
local function ruby(settings)
local base = settings.base
local comment = settings.comment
shared = settings
local c = lpegmatch(splitter,comment)
if #c == 1 then
ctx_setruby(base,comment)
if trace_rubies then
report_rubies("- %s -> %s",base,comment)
end
else
local i = 0
for b in utfcharacters(base) do
i = i + 1
local r = c[i]
if r then
ctx_setruby(b,r)
if trace_rubies then
report_rubies("%i: %s -> %s",i,b,r)
end
else
ctx_setruby(b,"")
if trace_rubies then
report_rubies("%i: %s",i,b)
end
end
end
end
if enable then
enable()
end
end
local function startruby(settings)
shared = settings
if enable then
enable()
end
end
implement {
name = "ruby",
actions = ruby,
arguments = {
{
{ "align" },
{ "stretch" },
{ "hoffset", "dimension" },
{ "voffset", "dimension" },
{ "comment" },
{ "base" },
}
},
}
implement {
name = "startruby",
actions = startruby,
arguments = {
{
{ "align" },
{ "stretch" },
{ "hoffset", "dimension" },
{ "voffset", "dimension" },
}
},
}
local function setruby(n,m)
nofrubies = nofrubies + 1
local r = takebox(n)
rubylist[nofrubies] = setmetatableindex({
text = r,
width = getwidth(r),
basewidth = 0,
start = false,
stop = false,
}, shared)
texsetattribute(a_ruby,nofrubies)
end
implement {
name = "setruby",
actions = setruby,
arguments = "integer",
}
end
function rubies.check(head)
local current = head
local start = nil
local stop = nil
local found = nil
local function flush(where)
local r = rubylist[found]
if r then
local prev = getprev(start)
local next = getnext(stop)
setprev(start)
setnext(stop)
local h = hpack(start)
if start == head then
head = h
else
setlink(prev,h)
end
setlink(h,next)
local bwidth = getwidth(h)
local rwidth = r.width
r.basewidth = bwidth
r.start = start
r.stop = stop
setprop(h,"ruby",found)
if rwidth > bwidth then
-- ruby is wider
setwidth(h,rwidth)
end
end
end
while current do
local nx = getnext(current)
local id = getid(current)
if id == glyph_code then
local a = getattr(current,a_ruby)
if not a then
if found then
flush("flush 1")
found = nil
end
elseif a == found then
stop = current
else
if found then
flush("flush 2")
end
found = a
start = current
stop = current
end
-- go on
elseif id == kern_code and getsubtype(current,fontkern_code) then
-- go on
elseif found and id == disc_code then
-- go on (todo: look into disc)
elseif found then
flush("flush 3")
found = nil
end
current = nx
end
if found then
flush("flush 4")
end
return head, true -- no need for true
end
local attach
local function whatever(current)
local a = getprop(current,"ruby")
if a then
local ruby = rubylist[a]
local align = ruby.align or v_middle
local stretch = ruby.stretch or v_no
local hoffset = ruby.hoffset or 0
local voffset = ruby.voffset or 0
local start = ruby.start
local stop = ruby.stop
local text = ruby.text
local rwidth = ruby.width
local bwidth = ruby.basewidth
local delta = rwidth - bwidth
setwidth(text,0)
if voffset ~= 0 then
setshift(text,voffset)
end
-- center them
if delta > 0 then
-- ruby is wider
if stretch == v_yes then
setlink(text,start)
while start and start ~= stop do
local s = nodepool.stretch()
local n = getnext(start)
setlink(start,s,n)
start = n
end
text = hpack(text,rwidth,"exactly")
else
local left = new_kern(delta/2)
local right = new_kern(delta/2)
setlink(text,left,start)
setlink(stop,right)
end
setlist(current,text)
elseif delta < 0 then
-- ruby is narrower
if align == v_auto then
local l = true
local c = getprev(current)
while c do
local id = getid(c)
if id == glue_code or id == penalty_code or id == kern_code then
-- go on
elseif id == hlist_code and getwidth(c) == 0 then
-- go on
elseif id == whatsit_code or id == localpar_code or id == dir_code then
-- go on
else
l = false
break
end
c = getprev(c)
end
local r = true
local c = getnext(current)
while c do
local id = getid(c)
if id == glue_code or id == penalty_code or id == kern_code then
-- go on
elseif id == hlist_code and getwidth(c) == 0 then
-- go on
else
r = false
break
end
c = getnext(c)
end
if l and not r then
align = v_flushleft
elseif r and not l then
align = v_flushright
else
align = v_middle
end
end
if align == v_flushleft then
setlink(text,start)
setlist(current,text)
elseif align == v_flushright then
local left = new_kern(-delta)
local right = new_kern(delta)
setlink(left,text,right,start)
setlist(current,left)
else
local left = new_kern(-delta/2)
local right = new_kern(delta/2)
setlink(left,text,right,start)
setlist(current,left)
end
else
setlink(text,start)
setlist(current,text)
end
setprop(current,"ruby",false)
rubylist[a] = nil
else
local list = getlist(current)
if list then
attach(list)
end
end
end
attach = function(head) -- traverse_list
for current in nexthlist, head do
whatever(current)
end
for current in nextvlist, head do
whatever(current)
end
return head
end
rubies.attach = attach
-- for now there is no need to be compact
-- local data = { }
-- rubies.data = data
--
-- function rubies.define(settings)
-- data[#data+1] = settings
-- return #data
-- end
--
-- implement {
-- name = "defineruby",
-- actions = { rubies.define, context },
-- arguments = {
-- {
-- { "align" },
-- { "stretch" },
-- }
-- }
-- }
|