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if not modules then modules = { } end modules ['typo-brk'] = {
version = 1.001,
comment = "companion to typo-brk.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- this code dates from the beginning and is kind of experimental; it
-- will be optimized and improved soon
local next, type, tonumber, tostring = next, type, tonumber, tostring
local utfbyte, utfchar = utf.byte, utf.char
local format = string.format
local trace_breakpoints = false trackers.register("typesetters.breakpoints", function(v) trace_breakpoints = v end)
local report_breakpoints = logs.reporter("typesetting","breakpoints")
local nodes, node = nodes, node
local settings_to_array = utilities.parsers.settings_to_array
local nuts = nodes.nuts
local tonut = nuts.tonut
local getnext = nuts.getnext
local getprev = nuts.getprev
local getboth = nuts.getboth
local getsubtype = nuts.getsubtype
local getfont = nuts.getfont
local getid = nuts.getid
----- getattr = nuts.getattr
local getattrlist = nuts.getattrlist
local takeattr = nuts.takeattr
local getlang = nuts.getlang
local isglyph = nuts.isglyph
local setattr = nuts.setattr
local setattrlist = nuts.setattrlist
local setlink = nuts.setlink
local setchar = nuts.setchar
local setdisc = nuts.setdisc
local setnext = nuts.setnext
local setprev = nuts.setprev
local setboth = nuts.setboth
local setsubtype = nuts.setsubtype
local copy_node = nuts.copy_node
local copy_node_list = nuts.copy_list
local flush_node = nuts.flush_node
local insert_node_before = nuts.insert_before
local insert_node_after = nuts.insert_after
local remove_node = nuts.remove
local end_of_math = nuts.end_of_math
local tonodes = nuts.tonodes
local texsetattribute = tex.setattribute
local unsetvalue = attributes.unsetvalue
local nodepool = nuts.pool
local enableaction = nodes.tasks.enableaction
local v_reset = interfaces.variables.reset
local v_yes = interfaces.variables.yes
local implement = interfaces.implement
local new_penalty = nodepool.penalty
local new_glue = nodepool.glue
local new_disc = nodepool.disc
local new_wordboundary = nodepool.wordboundary
local nodecodes = nodes.nodecodes
local kerncodes = nodes.kerncodes
local kern_code = nodecodes.kern
local math_code = nodecodes.math
local fontkern_code = kerncodes.fontkern
local italickern_code = kerncodes.italiccorrection
local is_letter = characters.is_letter
local typesetters = typesetters
typesetters.breakpoints = typesetters.breakpoints or {}
local breakpoints = typesetters.breakpoints
breakpoints.mapping = breakpoints.mapping or { }
breakpoints.numbers = breakpoints.numbers or { }
breakpoints.methods = breakpoints.methods or { }
local methods = breakpoints.methods
local a_breakpoints = attributes.private("breakpoint")
storage.register("typesetters/breakpoints/mapping", breakpoints.mapping, "typesetters.breakpoints.mapping")
local mapping = breakpoints.mapping
local numbers = breakpoints.mapping
for i=1,#mapping do
local m = mapping[i]
numbers[m.name] = m
end
-- this needs a cleanup ... maybe make all of them disc nodes
-- todo: use boundaries
local function insert_break(head,start,stop,before,after,kern)
if not kern then
local p = new_penalty(before)
local g = new_glue()
setattrlist(p,start)
setattrlist(g,start)
insert_node_before(head,start,p)
insert_node_before(head,start,g)
end
local p = new_penalty(after)
local g = new_glue()
setattrlist(p,start)
setattrlist(g,start)
insert_node_after(head,stop,g)
insert_node_after(head,stop,p)
end
methods[1] = function(head,start,stop,settings,kern)
local p, n = getboth(stop)
if p and n then
insert_break(head,start,stop,10000,0,kern)
end
return head, stop
end
methods[6] = function(head,start,stop,settings,kern)
local p = getprev(start)
local n = getnext(stop)
if p and n then
if kern then
insert_break(head,start,stop,10000,0,kern)
else
local l = new_wordboundary()
local d = new_disc()
local r = new_wordboundary()
setattrlist(d,start) -- otherwise basemode is forced and we crash
setlink(p,l,d,r,n)
if start == stop then
setboth(start)
setdisc(d,start,nil,copy_node(start))
else
setprev(start)
setnext(stop)
setdisc(d,start,nil,copy_node_list(start))
end
stop = r
end
end
return head, stop
end
methods[2] = function(head,start) -- ( => (-
local p, n = getboth(start)
if p and n then
local replace
head, start, replace = remove_node(head,start)
local post = copy_node(replace)
local hyphen = copy_node(post)
setchar(hyphen,languages.prehyphenchar(getlang(post)))
setlink(post,hyphen)
head, start = insert_node_before(head,start,new_disc(nil,post,replace))
setattrlist(start,replace)
insert_break(head,start,start,10000,10000)
end
return head, start
end
methods[3] = function(head,start) -- ) => -)
local p, n = getboth(start)
if p and n then
local replace
head, start, replace = remove_node(head,start)
local pre = copy_node(replace)
local hyphen = copy_node(pre)
setchar(hyphen,languages.prehyphenchar(getlang(pre)))
setlink(hyphen,pre)
head, start = insert_node_before(head,start,new_disc(hyphen,nil,replace)) -- so not pre !
setattrlist(start,tmp)
insert_break(head,start,start,10000,10000)
end
return head, start
end
methods[4] = function(head,start) -- - => - - -
local p, n = getboth(start)
if p and n then
local tmp
head, start, tmp = remove_node(head,start)
head, start = insert_node_before(head,start,new_disc())
setattrlist(start,tmp)
setdisc(start,copy_node(tmp),copy_node(tmp),tmp)
insert_break(head,start,start,10000,10000)
end
return head, start
end
methods[5] = function(head,start,stop,settings) -- x => p q r
local p, n = getboth(start)
if p and n then
local tmp
head, start, tmp = remove_node(head,start)
head, start = insert_node_before(head,start,new_disc())
local attr = getattrlist(tmp)
local font = getfont(tmp)
local left = settings.left
local right = settings.right
local middle = settings.middle
if left then
left = tonodes(tostring(left),font,attr)
end
if right then
right = tonodes(tostring(right),font,attr)
end
if middle then
middle = tonodes(tostring(middle),font,attr)
end
setdisc(start,left,right,middle)
setattrlist(start,attr)
flush_node(tmp)
insert_break(head,start,start,10000,10000)
end
return head, start
end
-- we know we have a limited set
-- what if characters are replaced by the font handler
-- do we need to go into disc nodes (or do it as first step but then we need a pre/post font handler)
function breakpoints.handler(head)
local done = false
local attr = nil
local map = nil
local current = head
while current do
local char, id = isglyph(current)
if char then
-- local a = getattr(current,a_breakpoints)
local a = takeattr(current,a_breakpoints)
if a and a > 0 then
if a ~= attr then
local data = mapping[a]
if data then
map = data.characters
else
map = nil
end
attr = a
end
if map then
local cmap = map[char]
if cmap then
-- setattr(current,a_breakpoints,unsetvalue) -- should not be needed
-- for now we collect but when found ok we can move the handler here
-- although it saves nothing in terms of performance
local lang = getlang(current)
local smap = lang and lang >= 0 and lang < 0x7FFF and (cmap[languages.numbers[lang]] or cmap[""])
if smap then
local skip = smap.skip
local start = current
local stop = current
current = getnext(current)
if skip then
while current do
local c = isglyph(current)
if c == char then
stop = current
current = getnext(current)
else
break
end
end
end
local d = { start, stop, cmap, smap, char }
if done then
done[#done+1] = d
else
done = { d }
end
else
current = getnext(current)
end
else
current = getnext(current)
end
else
current = getnext(current)
end
else
current = getnext(current)
end
elseif id == math_code then
attr = nil
current = end_of_math(current)
if current then
current = getnext(current)
end
else
current = getnext(current)
end
end
if not done then
return head
end
-- we have hits
-- local numbers = languages.numbers
for i=1,#done do
local data = done[i]
local start = data[1]
local stop = data[2]
local cmap = data[3]
local smap = data[4]
-- we do a sanity check for language
-- local lang = getlang(start)
-- local smap = lang and lang >= 0 and lang < 0x7FFF and (cmap[numbers[lang]] or cmap[""])
-- if smap then
local nleft = smap.nleft
local cleft = 0
local prev = getprev(start)
local kern = nil
while prev and nleft ~= cleft do
local char, id = isglyph(prev)
if char then
if not is_letter[char] then
cleft = -1
break
end
cleft = cleft + 1
prev = getprev(prev)
elseif id == kern_code then
local s = getsubtype(prev)
if s == fontkern_code or s == italickern_code then
if cleft == 0 then
kern = prev
prev = getprev(prev)
else
break
end
else
break
end
else
break
end
end
if nleft == cleft then
local nright = smap.nright
local cright = 0
local next = getnext(stop) -- getnext(start)
while next and nright ~= cright do
local char, id = isglyph(next)
if char then
if not is_letter[char] then
cright = -1
break
end
if cright == 1 and cmap[char] then
-- let's not make it too messy
break
end
cright = cright + 1
next = getnext(next)
elseif id == kern_code then
local s = getsubtype(next)
if s == fontkern_code or s == italickern_code then
if cleft == 0 then
next = getnext(next)
else
break
end
else
break
end
else
break
end
end
if nright == cright then
local method = methods[smap.type]
if method then
head, start = method(head,start,stop,smap,kern)
end
end
-- end
end
end
return head
end
local enabled = false
function breakpoints.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 breakpoints.setreplacement(name,char,language,settings)
char = utfbyte(char)
local data = numbers[name]
if data then
local characters = data.characters
local cmap = characters[char]
if not cmap then
cmap = { }
characters[char] = cmap
end
local left, right, middle = settings.left, settings.right, settings.middle
cmap[language or ""] = {
type = tonumber(settings.type) or 1,
nleft = tonumber(settings.nleft) or 1,
nright = tonumber(settings.nright) or 1,
left = left ~= "" and left or nil,
right = right ~= "" and right or nil,
middle = middle ~= "" and middle or nil,
skip = settings.range == v_yes,
} -- was { type or 1, before or 1, after or 1 }
end
end
function breakpoints.set(n)
if n == v_reset then
n = unsetvalue
else
n = mapping[n]
if not n then
n = unsetvalue
else
if not enabled then
if trace_breakpoints then
report_breakpoints("enabling breakpoints handler")
end
enableaction("processors","typesetters.breakpoints.handler")
end
n = n.number
end
end
texsetattribute(a_breakpoints,n)
end
-- interface
implement {
name = "definebreakpoints",
actions = breakpoints.define,
arguments = "string"
}
implement {
name = "definebreakpoint",
actions = breakpoints.setreplacement,
arguments = {
"string",
"string",
"string",
{
{ "type", "integer" },
{ "nleft", "integer" },
{ "nright", "integer" },
{ "right" },
{ "left" },
{ "middle" },
{ "range" },
}
}
}
implement {
name = "setbreakpoints",
actions = breakpoints.set,
arguments = "string"
}
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