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if not modules then modules = { } end modules ['lang-hyp'] = {
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"
}
-- In an automated workflow hypenation of long titles can be somewhat problematic
-- especially when demands conflict. For that reason I played a bit with a Lua based
-- variant of the traditional hyphenation machinery. This mechanism has been extended
-- several times in projects, of which a good description can be found in TUGboat,
-- Volume 27 (2006), No. 2 — Proceedings of EuroTEX2006: Automatic non-standard
-- hyphenation in OpenOffice.org by László Németh.
--
-- Being the result of two days experimenting the following implementation is probably
-- not completely okay yet. If there is demand I might add some more features and plugs.
-- The performance is quite okay but can probably improved a bit, although this is not
-- the most critital code.
--
-- . a l g o r i t h m .
-- 4l1g4
-- l g o3
-- 1g o
-- 2i t h
-- 4h1m
-- ---------------------
-- 4 1 4 3 2 0 4 1
-- a l-g o-r i t h-m
-- . a s s z o n n y a l .
-- s1s z/sz=sz,1,3
-- n1n y/ny=ny,1,3
-- -----------------------
-- 0 1 0 0 0 1 0 0 0/sz=sz,2,3,ny=ny,6,3
-- a s-s z o n-n y a l/sz=sz,2,3,ny=ny,6,3
--
-- ab1cd/ef=gh,2,2 : acd - efd (pattern/replacement,start,length
local type, rawset, tonumber = type, rawset, tonumber
local P, R, S, Cg, Cf, Ct, Cc, C, Carg, Cs = lpeg.P, lpeg.R, lpeg.S, lpeg.Cg, lpeg.Cf, lpeg.Ct, lpeg.Cc, lpeg.C, lpeg.Carg, lpeg.Cs
local lpegmatch = lpeg.match
local concat = table.concat
local utfchar = utf.char
local utfbyte = utf.byte
if not characters then
require("char-ini")
end
local setmetatableindex = table.setmetatableindex
local languages = languages or { }
local hyphenators = languages.hyphenators or { }
languages.hyphenators = hyphenators
local traditional = hyphenators.traditional or { }
hyphenators.traditional = traditional
local dictionaries = setmetatableindex(function(t,k)
local v = {
patterns = { },
hyphenated = { },
specials = { },
}
t[k] = v
return v
end)
local digit = R("09")
local character = lpeg.patterns.utf8character - P("/")
local splitpattern_k = Cs((digit/"" + character)^1)
local splitpattern_v = Ct(((digit/tonumber + Cc(0)) * character)^1 * (digit/tonumber)^0)
local splitpattern_v =
Ct(((digit/tonumber + Cc(0)) * character)^1 * (digit/tonumber)^0) *
(P("/") * Cf ( Ct("") *
Cg ( Cc("before") * C((1-lpeg.P("="))^1) * P("=") )
* Cg ( Cc("after") * C((1-lpeg.P(","))^1) * P(",") )
* Cg ( Cc("start") * ((1-lpeg.P(","))^1/tonumber) * P(",") )
* Cg ( Cc("length") * ((1-lpeg.P(-1) )^1/tonumber) )
, rawset))^-1
local function register(patterns,specials,str,specification)
local k = lpegmatch(splitpattern_k,str)
local v1, v2 = lpegmatch(splitpattern_v,str)
patterns[k] = v1
if specification then
specials[k] = specification
elseif v2 then
specials[k] = v2
end
end
local word = ((Carg(1) * Carg(2) * C((1 - P(" "))^1)) / register + 1)^1
local split = Ct(C(character)^1)
function traditional.loadpatterns(language,filename)
local specification = require(filename)
local dictionary = dictionaries[language]
if specification then
local patterns = specification.patterns
if patterns then
lpegmatch(word,patterns.data,1,dictionary.patterns,dictionary.specials)
end
end
return dictionary
end
local lcchars = characters.lcchars
local uccodes = characters.uccodes
local nofwords = 0
local nofhashed = 0
local function hyphenate(dictionary,word)
nofwords = nofwords + 1
local hyphenated = dictionary.hyphenated
local isstring = type(word) == "string"
local done
if isstring then
done = hyphenated[word]
else
done = hyphenated[concat(word)]
end
if done ~= nil then
return done
else
done = false
end
local specials = dictionary.specials
local patterns = dictionary.patterns
local s = isstring and lpegmatch(split,word) or word
local l = #s
local w = { }
for i=1,l do
local si = s[i]
w[i] = lcchars[si] or si
end
local spec
for i=1,l do
for j=i,l do
local c = concat(w,"",i,j)
local m = patterns[c]
if m then
local s = specials[c]
if not done then
done = { }
spec = { }
for i=1,l do
done[i] = 0
end
end
for k=1,#m do
local new = m[k]
if not new then
break
elseif new > 0 then
local pos = i + k - 1
local old = done[pos]
if not old then
-- break ?
elseif new > old then
done[pos] = new
if s then
local b = i + s.start - 1
local e = b + s.length - 1
if pos >= b and pos <= e then
spec[pos] = s
end
end
end
end
end
end
end
end
if done then
local okay = false
for i=1,#done do
if done[i] % 2 == 1 then
done[i] = spec[i] or true
okay = true
else
done[i] = false
end
end
if not okay then
done = false
end
end
hyphenated[isstring and word or concat(word)] = done
nofhashed = nofhashed + 1
return done
end
local f_detail_1 = string.formatters["{%s}{%s}{}"]
local f_detail_2 = string.formatters["{%s%s}{%s%s}{%s}"]
function traditional.injecthyphens(dictionary,word,specification)
local h = hyphenate(dictionary,word)
if not h then
return word
end
local w = lpegmatch(split,word)
local r = { }
local l = #h
local n = 0
local i = 1
local leftmin = specification.lefthyphenmin or 2
local rightmin = l - (specification.righthyphenmin or left) + 1
local leftchar = specification.lefthyphenchar
local rightchar = specification.righthyphenchar
while i <= l do
if i > leftmin and i < rightmin then
local hi = h[i]
if not hi then
n = n + 1
r[n] = w[i]
i = i + 1
elseif hi == true then
n = n + 1
r[n] = f_detail_1(rightchar,leftchar)
n = n + 1
r[n] = w[i]
i = i + 1
else
local b = i - hi.start
local e = b + hi.length - 1
n = b
r[n] = f_detail_2(hi.before,rightchar,leftchar,hi.after,concat(w,"",b,e))
if e + 1 == i then
i = i + 1
else
i = e + 1
end
end
else
n = n + 1
r[n] = w[i]
i = i + 1
end
end
return concat(r)
end
function traditional.registerpattern(language,str,specification)
local dictionary = dictionaries[language]
register(dictionary.patterns,dictionary.specials,str,specification)
end
-- todo: unicodes or utfhash ?
if context then
local nodecodes = nodes.nodecodes
local glyph_code = nodecodes.glyph
local math_code = nodecodes.math
local nuts = nodes.nuts
local tonut = nodes.tonut
local nodepool = nuts.pool
local new_disc = nodepool.disc
local setfield = nuts.setfield
local getfield = nuts.getfield
local getchar = nuts.getchar
local getid = nuts.getid
local getnext = nuts.getnext
local getprev = nuts.getprev
local insert_before = nuts.insert_before
local insert_after = nuts.insert_after
local copy_node = nuts.copy
local remove_node = nuts.remove
local end_of_math = nuts.end_of_math
local node_tail = nuts.tail
function traditional.loadpatterns(language)
return dictionaries[language]
end
statistics.register("hyphenation",function()
if nofwords > 0 then
return string.format("%s words hyphenated, %s unique",nofwords,nofhashed)
end
end)
setmetatableindex(dictionaries,function(t,k) -- we use an independent data structure
local specification = languages.getdata(k)
local dictionary = {
patterns = { },
hyphenated = { },
specials = { },
instance = 0,
characters = { },
unicodes = { },
}
if specification then
local resources = specification.resources
if resources then
local patterns = resources.patterns
if patterns then
local data = patterns.data
if data then
-- regular patterns
lpegmatch(word,data,1,dictionary.patterns,dictionary.specials)
end
local extra = patterns.extra
if extra then
-- special patterns
lpegmatch(word,extra,1,dictionary.patterns,dictionary.specials)
end
end
local usedchars = lpegmatch(split,patterns.characters)
local characters = { }
local unicodes = { }
for i=1,#usedchars do
local char = usedchars[i]
local code = utfbyte(char)
local upper = uccodes[code]
characters[char] = code
unicodes [code] = char
unicodes [upper] = utfchar(upper)
end
dictionary.characters = characters
dictionary.unicodes = unicodes
setmetatableindex(characters,function(t,k) local v = utfbyte(k) t[k] = v return v end) -- can be non standard
-- setmetatableindex(unicodes, function(t,k) local v = utfchar(k) t[k] = v return v end)
end
t[specification.number] = dictionary
dictionary.instance = specification.instance -- needed for hyphenchars
end
t[k] = dictionary
return dictionary
end)
local function flush(head,start,stop,dictionary,w,h,lefthyphenchar,righthyphenchar,characters,lefthyphenmin,righthyphenmin)
local r = { }
local l = #h
local n = 0
local i = 1
local left = lefthyphenmin
local right = l - righthyphenmin + 1
while i <= l do
if i > left and i < right then
local hi = h[i]
if not hi then
n = n + 1
r[n] = w[i]
i = i + 1
elseif hi == true then
n = n + 1
r[n] = true
n = n + 1
r[n] = w[i]
i = i + 1
else
local b = i - hi.start -- + 1 - 1
local e = b + hi.length - 1
n = b
r[n] = { hi.before, hi.after, concat(w,"",b,e) }
i = e + 1
end
else
n = n + 1
r[n] = w[i]
i = i + 1
end
end
local function serialize(s,lefthyphenchar,righthyphenchar)
if not s then
return
elseif s == true then
local n = copy_node(stop)
setfield(n,"char",lefthyphenchar or righthyphenchar)
return n
end
local h = nil
local c = nil
if lefthyphenchar then
h = copy_node(stop)
setfield(h,"char",lefthyphenchar)
c = h
end
if #s == 1 then
local n = copy_node(stop)
setfield(n,"char",characters[s])
if not h then
h = n
else
insert_after(c,c,n)
end
c = n
else
local t = lpegmatch(split,s)
for i=1,#t do
local n = copy_node(stop)
setfield(n,"char",characters[t[i]])
if not h then
h = n
else
insert_after(c,c,n)
end
c = n
end
end
if righthyphenchar then
local n = copy_node(stop)
insert_after(c,c,n)
setfield(n,"char",righthyphenchar)
end
return h
end
-- no grow
local current = start
local size = #r
for i=1,size do
local ri = r[i]
if ri == true then
local n = new_disc()
if righthyphenchar then
setfield(n,"pre",serialize(true,righthyphenchar))
end
if lefthyphenchar then
setfield(n,"post",serialize(true,lefthyphenchar))
end
insert_before(head,current,n)
elseif type(ri) == "table" then
local n = new_disc()
local pre, post, replace = ri[1], ri[2], ri[3]
if pre then
setfield(n,"pre",serialize(pre,false,righthyphenchar))
end
if post then
setfield(n,"post",serialize(post,lefthyphenchar,false))
end
if replace then
setfield(n,"replace",serialize(replace))
end
insert_before(head,current,n)
else
setfield(current,"char",characters[ri])
if i < size then
current = getnext(current)
end
end
end
if current ~= stop then
local current = getnext(current)
local last = getnext(stop)
while current ~= last do
head, current = remove_node(head,current,true)
end
end
end
-- simple cases: no special .. only inject
local prehyphenchar = lang.prehyphenchar
local posthyphenchar = lang.posthyphenchar
local lccodes = characters.lccodes
-- An experimental feature:
--
-- \setupalign[verytolerant,flushleft]
-- \setuplayout[width=140pt] \showframe
-- longword longword long word longword longwordword \par
-- \enabledirectives[hyphenators.rightwordsmin=1]
-- longword longword long word longword longwordword \par
-- \disabledirectives[hyphenators.rightwordsmin]
--
-- An alternative is of course to pack the words in an hbox.
local rightwordsmin = 0 -- todo: parproperties (each par has a number anyway)
function traditional.hyphenate(head)
local first = tonut(head)
local current = first
local dictionary = nil
local instance = nil
local characters = nil
local unicodes = nil
local language = nil
local start = nil
local stop = nil
local word = nil -- maybe reuse and pass size
local size = 0
local leftchar = false
local rightchar = false -- utfbyte("-")
local leftmin = 0
local rightmin = 0
local lastone = nil
if rightwordsmin > 0 then
lastone = node_tail(first)
local inword = false
while lastone and rightwordsmin > 0 do
local id = getid(lastone)
if id == glyph_code then
inword = true
elseif inword then
inword = false
rightwordsmin = rightwordsmin - 1
end
lastone = getprev(lastone)
end
end
while current ~= lastone do
local id = getid(current)
if id == glyph_code then
-- currently no lc/uc code support
local code = getchar(current)
local lang = getfield(current,"lang")
if lang ~= language then
if dictionary then
if leftmin + rightmin < #word then
local done = hyphenate(dictionary,word)
if done then
flush(first,start,stop,dictionary,word,done,leftchar,rightchar,characters,leftmin,rightmin)
end
end
end
language = lang
dictionary = dictionaries[language]
instance = dictionary.instance
characters = dictionary.characters
unicodes = dictionary.unicodes
leftchar = instance and posthyphenchar(instance)
rightchar = instance and prehyphenchar (instance)
leftmin = getfield(current,"left")
rightmin = getfield(current,"right")
if not leftchar or leftchar < 0 then
leftchar = false
end
if not rightchar or rightchar < 0 then
rightchar = false
end
local char = unicodes[code]
if char then
word = { char }
size = 1
start = current
end
elseif word then
local char = unicodes[code]
if char then
size = size + 1
word[size] = char
elseif dictionary then
if leftmin + rightmin < #word then
local done = hyphenate(dictionary,word)
if done then
flush(first,start,stop,dictionary,word,done,leftchar,rightchar,characters,leftmin,rightmin)
end
end
word = nil
end
else
local char = unicodes[code]
if char then
word = { char }
size = 1
start = current
-- leftmin = getfield(current,"left") -- can be an option
-- rightmin = getfield(current,"right") -- can be an option
end
end
stop = current
current = getnext(current)
elseif word then
if dictionary then
if leftmin + rightmin < #word then
local done = hyphenate(dictionary,word)
current = getnext(current)
if done then
flush(first,start,stop,dictionary,word,done,leftchar,rightchar,characters,leftmin,rightmin)
end
else
current = getnext(current) -- hm
end
else
current = getnext(current)
end
word = nil
elseif id == math_code then
current = getnext(end_of_math(current))
else
current = getnext(current)
end
end
return head, true
end
local texmethod = "builders.kernel.hyphenation"
local oldmethod = texmethod
local newmethod = texmethod
-- local newmethod = "languages.hyphenators.traditional.hyphenate"
--
-- nodes.tasks.prependaction("processors","words",newmethod)
-- nodes.tasks.disableaction("processors",oldmethod)
--
-- nodes.tasks.replaceaction("processors","words",oldmethod,newmethod)
-- \enabledirectives[hyphenators.method=traditional]
-- \enabledirectives[hyphenators.method=builtin]
directives.register("hyphenators.method",function(v)
if type(v) == "string" then
local valid = languages.hyphenators[v]
if valid and valid.hyphenate then
newmethod = "languages.hyphenators." .. v .. ".hyphenate"
else
newmethod = texmethod
end
else
newmethod = texmethod
end
if oldmethod ~= newmethod then
nodes.tasks.replaceaction("processors","words",oldmethod,newmethod)
end
oldmethod = newmethod
end)
-- experimental feature
directives.register("hyphenators.rightwordsmin",function(v)
rightwordsmin = tonumber(v) or 0
end)
else
-- traditional.loadpatterns("nl","lang-nl")
-- traditional.loadpatterns("de","lang-de")
-- traditional.registerpattern("nl","e1ë", { start = 1, length = 2, before = "e", after = "e" } )
-- traditional.registerpattern("nl","oo1ë", { start = 2, length = 3, before = "o", after = "e" } )
-- traditional.registerpattern("de","qqxc9xkqq",{ start = 3, length = 4, before = "ab", after = "cd" } )
-- local specification = {
-- lefthyphenmin = 2,
-- righthyphenmin = 2,
-- lefthyphenchar = "<",
-- righthyphenchar = ">",
-- }
-- print("reëel", traditional.injecthyphens(dictionaries.nl,"reëel", specification),"r{e>}{<e}{eë}el")
-- print("reeëel", traditional.injecthyphens(dictionaries.nl,"reeëel", specification),"re{e>}{<e}{eë}el")
-- print("rooëel", traditional.injecthyphens(dictionaries.nl,"rooëel", specification),"r{o>}{<e}{ooë}el")
-- print( "qxcxkq", traditional.injecthyphens(dictionaries.de, "qxcxkq", specification),"")
-- print( "qqxcxkqq", traditional.injecthyphens(dictionaries.de, "qqxcxkqq", specification),"")
-- print( "qqqxcxkqqq", traditional.injecthyphens(dictionaries.de, "qqqxcxkqqq", specification),"")
-- print("qqqqxcxkqqqq",traditional.injecthyphens(dictionaries.de,"qqqqxcxkqqqq",specification),"")
end
|