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if not modules then modules = { } end modules ['lang-tra'] = {
version = 1.001,
comment = "companion to lang-tra.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- The indic transliterations was researched by kauśika and after some experiments
-- we settled on the current approach (mappings and a more specific lpeg).
-- Todo: initial and final in addition to mapping so that we can do hebrew and
-- such.
local concat, setmetatableindex = table.concat, table.setmetatableindex
local nospaces = string.nospaces
local utfbyte, utfchar, utfsplit, utfvalues = utf.byte, utf.char, utf.split, utf.values
local C, Cc, Cs, lpegmatch = lpeg.C, lpeg.Cc, lpeg.Cs, lpeg.match
local utfchartabletopattern = lpeg.utfchartabletopattern
local utfcharacterpattern = lpeg.patterns.utf8character
local nuts = nodes.nuts
local nextchar = nuts.traversers.char
local getattr = nuts.getattr
local setchar = nuts.setchar
local getnext = nuts.getnext
local isnextchar = nuts.isnextchar
local insertafter = nuts.insertafter
local copynode = nuts.copy
local removenode = nuts.remove
local texsetattribute = tex.setattribute
local registervalue = attributes.registervalue
local getvalue = attributes.getvalue
local transliteration = { }
languages.transliteration = transliteration
local a_transliteration = attributes.private("transliteration")
local unsetvalue = attributes.unsetvalue
local implement = interfaces.implement
local context = context
local zwj = utf.char(0x200D)
-- local lastmapping = 0
local loadedmappings = { }
local loadedlibraries = { }
local exceptions = { }
local report = logs.reporter("transliteration")
local trace = false trackers.register("languages.transliteration", function(v) trace = v end)
local converters = {
-- ["iast to deva"] = function(m)
-- local t_svara = m.svara
-- local p_svara = utfchartabletopattern(t_svara)
-- local t_vyanjana = m.vyanjana
-- local p_vyanjana = utfchartabletopattern(t_vyanjana)
-- local t_maatra = m.maatra
-- local p_maatra = utfchartabletopattern(t_maatra)
-- local t_viraama = m.viraama
-- local p_viraama = utfchartabletopattern(t_viraama)
-- local t_boundary = m.boundary
-- local p_boundary = utfchartabletopattern(t_boundary)
-- local t_yogavaaha = m.yogavaaha
-- local p_yogavaaha = utfchartabletopattern(t_yogavaaha)
-- local p_svara_boundary = 1 - p_svara - p_vyanjana - p_yogavaaha
-- local p = Cs ( (
-- p_svara / t_svara
-- + p_vyanjana / t_vyanjana
-- + p_viraama / t_viraama
-- + p_yogavaaha / t_yogavaaha
-- + C(utfcharacterpattern)
-- )^0 )
-- return function(s)
-- -- for now
-- -- s = zwj .. s
-- --
-- return lpegmatch(p,s) or s
-- end
-- end,
["mapping"] = function(m)
local t_mapping = m.mapping
if t_mapping then
local t_exceptions = m.exceptions
local p = Cs ( (
utfchartabletopattern(t_mapping) / t_mapping
+ C(utfcharacterpattern)
)^0 )
-- lpeg.print(p)
return function(s,e)
return (e and e[s]) or t_exceptions[s] or lpegmatch(p,s) or s
end
else
return false
end
end,
["default"] = function(m)
local t_exceptions = m.exceptions
return function(s,e)
return (e and e[s]) or t_exceptions[s] or s
end
end,
}
function transliteration.use(library)
local lib = loadedlibraries[library]
if lib == nil then
-- todo: use library loader
local data = require("lang-imp-" .. library)
if data then
local transliterations = data.transliterations
if transliterations then
for name, d in table.sortedhash(transliterations) do
local vector = d.vector
if not d.exceptions then
d.exceptions = { }
end
if vector then
report("vector %a in %a is %sloaded",name,library," already")
else
d.vector = (converters[name] or converters.mapping or converters.default)(d)
or (converters.default)(d)
report("vector %a in set %a is %sloaded",name,library,"")
end
d.library = library
d.name = name
d.mapping = nil -- for now, saves memory
loadedmappings[name] = d
loadedmappings[nospaces(name)] = d
end
else
report("library %a has no transliterations",library)
end
loadedlibraries[library] = data
else
loadedlibraries[library] = false
end
end
end
local enable = false
enable = function()
nodes.tasks.enableaction("processors", "languages.transliteration.handler")
enable = false
end
function transliteration.register(parent,name)
local p = exceptions[parent]
if p then
if trace then
report("%a has exceptions that default to %a",name,parent)
end
exceptions[name] = setmetatableindex({ },p)
else
if trace then
report("%a has independent exceptions",name)
end
exceptions[name] = { }
end
end
function transliteration.set(name,vector)
if enable then
enable()
end
local a = registervalue(a_transliteration, {
m = loadedmappings[vector],
e = exceptions[name],
})
if trace then
report("setting transliteration %i, name %a, vector %a",a,name,vector)
end
texsetattribute(a_transliteration,a)
end
function transliteration.exception(name,old,new)
local m = loadedmappings[name]
if m then
m.exceptions[old] = new
else
local e = exceptions[name]
if not e then
e = { }
exceptions[name] = e
end
e[old] = new
end
end
-- When there is need I will improve the performance of the next handler.
function transliteration.handler(head)
local aprev = nil
local vector = nil
local except = nil
local current = head
local first = nil
local last = nil
local list = { }
local size = 0
-- we need a more clever one: run over small ranges in order to keep colors etc
-- actually we can generalize the replacer elsewhere
local function flush(nxt)
if vector then
-- we can do some optimization here by having the split as replacement
local old = concat(list,"",1,size)
local new = vector(old,except)
if old ~= new then
if trace then
report("old: %s",old)
report("new: %s",new)
end
local c = first
local x = false
for s in utfvalues(new) do
if x then
head, c = insertafter(head,c,copynode(first))
setchar(c,s)
else
setchar(c,s)
if c == last then
x = true
else
c = getnext(c)
end
end
end
if not x then
while c do
head, c = removenode(head,c,true)
if c == nxt then
break
end
end
end
end
end
end
while current do
local nxt, chr, more = isnextchar(current)
if chr then
local a = getattr(current,a_transliteration)
if a then
if a ~= aprev then
if first then
flush(nxt)
first = nil
size = 0
end
aprev = a
local data = getvalue(a_transliteration,a)
if data then
local m = data.m
if m then
vector = m.vector
except = data.e
else
vector = nil
except = nil
end
else
vector = nil
except = nil
end
end
if not first then
first = current
end
last = current
size = size + 1
list[size] = utfchar(chr)
if not more then
flush(nxt)
first = nil
size = 0
-- we can go ahead one next
end
else
if first then
flush(nxt)
first = nil
size = 0
end
end
end
current = nxt
end
if first then
flush(nxt)
end
return head
end
interfaces.implement {
name = "usetransliteration",
public = true,
protected = true,
arguments = "optional",
actions = transliteration.use,
}
implement {
name = "settransliteration",
arguments = "2 strings",
actions = transliteration.set,
}
implement {
name = "registertransliteration",
arguments = "3 strings",
actions = transliteration.register,
}
implement {
name = "transliterationexception",
arguments = "3 strings",
actions = transliteration.exception,
}
nodes.tasks.prependaction("processors", "normalizers", "languages.transliteration.handler", nil, "nut", "disabled" )
local function transliterate(scheme,str)
if str and str ~= "" then
local m = loadedmappings[scheme]
local c = m and m.vector
context(c and c(str) or str)
end
end
local getbuffer = buffers.getcontent
implement {
name = "transliterate",
public = true,
protected = true,
arguments = { "optional", "string" },
actions = transliterate,
}
implement {
name = "transliteratebuffer",
public = true,
protected = true,
arguments = { "optional", "string" },
actions = function(scheme,name) transliterate(scheme,getbuffer(name)) end,
}
implement {
name = "transliterated",
public = true,
arguments = { "optional", "string" },
actions = transliterate,
}
implement {
name = "transliteratedbuffer",
public = true,
arguments = { "optional", "string" },
actions = function(scheme,name) transliterate(scheme,getbuffer(name)) end,
}
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