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-- filename : l-unicode.lua
-- comment : split off from luat-inp
-- author : Hans Hagen, PRAGMA-ADE, Hasselt NL
-- copyright: PRAGMA ADE / ConTeXt Development Team
-- license : see context related readme files
if not versions then versions = { } end versions['l-unicode'] = 1.001
if not unicode then unicode = { } end
if not garbagecollector then
garbagecollector = {
push = function() collectgarbage("stop") end,
pop = function() collectgarbage("restart") end,
}
end
-- 0 EF BB BF UTF-8
-- 1 FF FE UTF-16-little-endian
-- 2 FE FF UTF-16-big-endian
-- 3 FF FE 00 00 UTF-32-little-endian
-- 4 00 00 FE FF UTF-32-big-endian
unicode.utfname = {
[0] = 'utf-8',
[1] = 'utf-16-le',
[2] = 'utf-16-be',
[3] = 'utf-32-le',
[4] = 'utf-32-be'
}
function unicode.utftype(f) -- \000 fails !
local str = f:read(4)
if not str then
f:seek('set')
return 0
elseif str:find("^%z%z\254\255") then
return 4
elseif str:find("^\255\254%z%z") then
return 3
elseif str:find("^\254\255") then
f:seek('set',2)
return 2
elseif str:find("^\255\254") then
f:seek('set',2)
return 1
elseif str:find("^\239\187\191") then
f:seek('set',3)
return 0
else
f:seek('set')
return 0
end
end
function unicode.utf16_to_utf8(str, endian)
garbagecollector.push()
local result = { }
local tc, uc = table.concat, unicode.utf8.char
local tmp, n, m, p = { }, 0, 0, 0
-- lf | cr | crlf / (cr:13, lf:10)
local function doit()
if n == 10 then
if p ~= 13 then
result[#result+1] = tc(tmp,"")
tmp = { }
p = 0
end
elseif n == 13 then
result[#result+1] = tc(tmp,"")
tmp = { }
p = n
else
tmp[#tmp+1] = uc(n)
p = 0
end
end
for l,r in str:bytepairs() do
if endian then
n = l*256 + r
else
n = r*256 + l
end
if m > 0 then
n = (m-0xD800)*0x400 + (n-0xDC00) + 0x10000
m = 0
doit()
elseif n >= 0xD800 and n <= 0xDBFF then
m = n
else
doit()
end
end
if #tmp > 0 then
result[#result+1] = tc(tmp,"")
end
garbagecollector.pop()
return result
end
function unicode.utf32_to_utf8(str, endian)
garbagecollector.push()
local result = { }
local tc, uc = table.concat, unicode.utf8.char
local tmp, n, m, p = { }, 0, -1, 0
-- lf | cr | crlf / (cr:13, lf:10)
local function doit()
if n == 10 then
if p ~= 13 then
result[#result+1] = tc(tmp,"")
tmp = { }
p = 0
end
elseif n == 13 then
result[#result+1] = tc(tmp,"")
tmp = { }
p = n
else
tmp[#tmp+1] = uc(n)
p = 0
end
end
for a,b in str:bytepairs() do
if a and b then
if m < 0 then
if endian then
m = a*256*256*256 + b*256*256
else
m = b*256 + a
end
else
if endian then
n = m + a*256 + b
else
n = m + b*256*256*256 + a*256*256
end
m = -1
doit()
end
else
break
end
end
if #tmp > 0 then
result[#result+1] = tc(tmp,"")
end
garbagecollector.pop()
return result
end
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