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local M = {}
require("unicode-normalize-names")
require('unicode-normalization')
local NFC = unicode.conformance.toNFC
local char = unicode.utf8.char
local gmatch = unicode.utf8.gmatch
local name = unicode.conformance.name
local byte = unicode.utf8.byte
-- local unidata = unicharacters.data
local length = unicode.utf8.len
local glyph_id = node.id "glyph"
M.debug = false
-- for some reason variable number of arguments doesn't work
local function debug_msg(a,b,c,d,e,f,g,h,i)
if M.debug then
local t = {a,b,c,d,e,f,g,h,i}
print("[uninormalize]", table.unpack(t))
end
end
local function make_hash (t)
local y = {}
for _,v in ipairs(t) do
y[v] = true
end
return y
end
local letter_categories = make_hash {"lu","ll","lt","lo","lm"}
local mark_categories = make_hash {"mn","mc","me"}
local function printchars(s)
local t = {}
for x in gmatch(s,".") do
t[#t+1] = name(byte(x))
end
debug_msg("characters",table.concat(t,":"))
end
local categories = {}
local function get_category(charcode)
local charcode = charcode or ""
if categories[charcode] then
return categories[charcode]
else
local unidatacode = unidata[charcode] or {}
local category = unidatacode.category
categories[charcode] = category
return category
end
end
-- get glyph char and category
local function glyph_info(n)
local char = n.char
return char, get_category(char)
end
local function get_mark(n)
if n.id == glyph_id then
local character, cat = glyph_info(n)
if mark_categories[cat] then
return char(character)
end
end
return false
end
local function make_glyphs(head, nextn,s, lang, font, subtype)
local g = function(a)
local new_n = node.new(glyph_id, subtype)
new_n.lang = lang
new_n.font = font
new_n.char = byte(a)
return new_n
end
if length(s) == 1 then
return node.insert_before(head, nextn,g(s))
else
local t = {}
local first = true
for x in gmatch(s,".") do
debug_msg("multi letter",x)
head, newn = node.insert_before(head, nextn, g(x))
end
return head
end
end
local function normalize_marks(head, n)
local lang, font, subtype = n.lang, n.font, n.subtype
local text = {}
text[#text+1] = char(n.char)
local head, nextn = node.remove(head, n)
--local nextn = n.next
local info = get_mark(nextn)
while(info) do
text[#text+1] = info
head, nextn = node.remove(head,nextn)
info = get_mark(nextn)
end
local s = NFC(table.concat(text))
debug_msg("We've got mark: " .. s)
local new_n = node.new(glyph_id, subtype)
new_n.lang = lang
new_n.font = font
new_n.char = byte(s)
--head, new_n = node.insert_before(head, nextn, new_n)
-- head, new_n = node.insert_before(head, nextn, make_glyphs(s, lang, font, subtype))
head, new_n = make_glyphs(head, nextn, s, lang, font, subtype)
local t = {}
for x in node.traverse_id(glyph_id,head) do
t[#t+1] = char(x.char)
end
debug_msg("Variables ", table.concat(t,":"), table.concat(text,";"), char(byte(s)),length(s))
return head, nextn
end
local function normalize_glyphs(head, n)
--local charcode = n.char
--local category = get_category(charcode)
local charcode, category = glyph_info(n)
if letter_categories[category] then
local nextn = n.next
if nextn and nextn.id == glyph_id then
--local nextchar = nextn.char
--local nextcat = get_category(nextchar)
local nextchar, nextcat = glyph_info(nextn)
if mark_categories[nextcat] then
return normalize_marks(head,n)
end
end
end
return head, n.next
end
function M.nodes(head)
local t = {}
local text = false
local n = head
-- for n in node.traverse(head) do
while n do
if n.id == glyph_id then
local charcode = n.char
debug_msg("unicode name",name(charcode))
debug_msg("character category",get_category(charcode))
t[#t+1]= char(charcode)
text = true
head, n = normalize_glyphs(head, n)
else
if text then
local s = table.concat(t)
debug_msg("text chunk",s)
--printchars(NFC(s))
debug_msg("----------")
end
text = false
t = {}
n = n.next
end
end
return head
end
local unibytes = {}
local function get_charcategory(s)
local s = s or ""
local b = unibytes[s] or byte(s) or 0
unibytes[s] = b
return get_category(b)
end
local function normalize_charmarks(t,i)
local c = {t[i]}
local i = i + 1
local s = get_charcategory(t[i])
while mark_categories[s] do
c[#c+1] = t[i]
i = i + 1
s = get_charcategory(t[i])
end
return NFC(table.concat(c)), i
end
local function normalize_char(t,i)
local ch = t[i]
local c = get_charcategory(ch)
if letter_categories[c] then
local nextc = get_charcategory(t[i+1])
if mark_categories[nextc] then
return normalize_charmarks(t,i)
end
end
return ch, i+1
end
function M.buffer(line)
local t = {}
local new_t = {}
-- we need to make table witl all uni chars on the line
for x in gmatch(line,".") do
t[#t+1] = x
end
local i = 1
-- normalize next char
local c, i = normalize_char(t, i)
new_t[#new_t+1] = c
while t[i] do
c, i = normalize_char(t,i)
-- local c = t[i]
-- i = i + 1
new_t[#new_t+1] = c
end
return table.concat(new_t)
end
return M
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