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|
if not modules then modules = { } end modules ['l-unicode'] = {
version = 1.001,
comment = "companion to luat-lib.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
if not unicode then
unicode = { utf8 = { } }
local floor, char = math.floor, string.char
function unicode.utf8.utfchar(n)
if n < 0x80 then
return char(n)
elseif n < 0x800 then
return char(
0xC0 + floor(n/0x40),
0x80 + (n % 0x40)
)
elseif n < 0x10000 then
return char(
0xE0 + floor(n/0x1000),
0x80 + (floor(n/0x40) % 0x40),
0x80 + (n % 0x40)
)
elseif n < 0x40000 then
return char(
0xF0 + floor(n/0x40000),
0x80 + floor(n/0x1000),
0x80 + (floor(n/0x40) % 0x40),
0x80 + (n % 0x40)
)
else
-- return char(
-- 0xF1 + floor(n/0x1000000),
-- 0x80 + floor(n/0x40000),
-- 0x80 + floor(n/0x1000),
-- 0x80 + (floor(n/0x40) % 0x40),
-- 0x80 + (n % 0x40)
-- )
return "?"
end
end
end
local unicode = unicode
utf = utf or unicode.utf8
local concat = table.concat
local utfchar, utfbyte, utfgsub = utf.char, utf.byte, utf.gsub
local char, byte, find, bytepairs, utfvalues, format = string.char, string.byte, string.find, string.bytepairs, string.utfvalues, string.format
local type = type
local utfsplitlines = string.utfsplitlines
-- 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'
}
-- \000 fails in <= 5.0 but is valid in >=5.1 where %z is depricated
function unicode.utftype(f)
local str = f:read(4)
if not str then
f:seek('set')
return 0
-- elseif find(str,"^%z%z\254\255") then -- depricated
-- elseif find(str,"^\000\000\254\255") then -- not permitted and bugged
elseif find(str,"\000\000\254\255",1,true) then -- seems to work okay (TH)
return 4
-- elseif find(str,"^\255\254%z%z") then -- depricated
-- elseif find(str,"^\255\254\000\000") then -- not permitted and bugged
elseif find(str,"\255\254\000\000",1,true) then -- seems to work okay (TH)
return 3
elseif find(str,"^\254\255") then
f:seek('set',2)
return 2
elseif find(str,"^\255\254") then
f:seek('set',2)
return 1
elseif find(str,"^\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) -- maybe a gsub is faster or an lpeg
--~ local result, tmp, n, m, p, r, t = { }, { }, 0, 0, 0, 0, 0 -- we reuse tmp
--~ -- lf | cr | crlf / (cr:13, lf:10)
--~ local function doit() -- inline this
--~ if n == 10 then
--~ if p ~= 13 then
--~ if t > 0 then
--~ r = r + 1
--~ result[r] = concat(tmp,"",1,t)
--~ t = 0
--~ end
--~ p = 0
--~ end
--~ elseif n == 13 then
--~ if t > 0 then
--~ r = r + 1
--~ result[r] = concat(tmp,"",1,t)
--~ t = 0
--~ end
--~ p = n
--~ else
--~ t = t + 1
--~ tmp[t] = utfchar(n)
--~ p = 0
--~ end
--~ end
--~ for l,r in bytepairs(str) do
--~ if r then
--~ if endian then -- maybe make two loops
--~ n = 256*l + r
--~ else
--~ n = 256*r + 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
--~ end
--~ if t > 0 then
--~ r = r + 1
--~ result[r] = concat(tmp,"",1,t) -- we reused tmp, hence t
--~ end
--~ return result
--~ end
--~ function unicode.utf32_to_utf8(str, endian)
--~ local result, tmp, n, m, p, r, t = { }, { }, 0, -1, 0, 0, 0
--~ -- lf | cr | crlf / (cr:13, lf:10)
--~ local function doit() -- inline this
--~ if n == 10 then
--~ if p ~= 13 then
--~ if t > 0 then
--~ r = r + 1
--~ result[r] = concat(tmp,"",1,t)
--~ t = 0
--~ end
--~ p = 0
--~ end
--~ elseif n == 13 then
--~ if t > 0 then
--~ r = r + 1
--~ result[r] = concat(tmp,"",1,t)
--~ t = 0
--~ end
--~ p = n
--~ else
--~ t = t + 1
--~ tmp[t] = utfchar(n)
--~ p = 0
--~ end
--~ end
--~ for a,b in bytepairs(str) do
--~ if a and b then
--~ if m < 0 then
--~ if endian then -- maybe make two loops
--~ m = 256*256*256*a + 256*256*b
--~ else
--~ m = 256*b + a
--~ end
--~ else
--~ if endian then -- maybe make two loops
--~ n = m + 256*a + b
--~ else
--~ n = m + 256*256*256*b + 256*256*a
--~ end
--~ m = -1
--~ doit()
--~ end
--~ else
--~ break
--~ end
--~ end
--~ if #tmp > 0 then
--~ r = r + 1
--~ result[r] = concat(tmp,"",1,t) -- we reused tmp, hence t
--~ end
--~ return result
--~ end
local function utf16_to_utf8_be(t)
if type(t) == "string" then
t = utfsplitlines(str)
end
local result = { } -- we reuse result
for i=1,#t do
local r, more = 0, 0
for left, right in bytepairs(t[i]) do
if right then
local now = 256*left + right
if more > 0 then
now = (more-0xD800)*0x400 + (now-0xDC00) + 0x10000 -- the 0x10000 smells wrong
more = 0
r = r + 1
result[r] = utfchar(now)
elseif now >= 0xD800 and now <= 0xDBFF then
more = now
else
r = r + 1
result[r] = utfchar(now)
end
end
end
t[i] = concat(result,"",1,r) -- we reused tmp, hence t
end
return t
end
local function utf16_to_utf8_le(t)
if type(t) == "string" then
t = utfsplitlines(str)
end
local result = { } -- we reuse result
for i=1,#t do
local r, more = 0, 0
for left, right in bytepairs(t[i]) do
if right then
local now = 256*right + left
if more > 0 then
now = (more-0xD800)*0x400 + (now-0xDC00) + 0x10000 -- the 0x10000 smells wrong
more = 0
r = r + 1
result[r] = utfchar(now)
elseif now >= 0xD800 and now <= 0xDBFF then
more = now
else
r = r + 1
result[r] = utfchar(now)
end
end
end
t[i] = concat(result,"",1,r) -- we reused tmp, hence t
end
return t
end
local function utf32_to_utf8_be(t)
if type(t) == "string" then
t = utfsplitlines(t)
end
local result = { } -- we reuse result
for i=1,#t do
local r, more = 0, -1
for a,b in bytepairs(t[i]) do
if a and b then
if more < 0 then
more = 256*256*256*a + 256*256*b
else
r = r + 1
result[t] = utfchar(more + 256*a + b)
more = -1
end
else
break
end
end
t[i] = concat(result,"",1,r)
end
return t
end
local function utf32_to_utf8_le(t)
if type(t) == "string" then
t = utfsplitlines(t)
end
local result = { } -- we reuse result
for i=1,#t do
local r, more = 0, -1
for a,b in bytepairs(t[i]) do
if a and b then
if more < 0 then
more = 256*b + a
else
r = r + 1
result[t] = utfchar(more + 256*256*256*b + 256*256*a)
more = -1
end
else
break
end
end
t[i] = concat(result,"",1,r)
end
return t
end
unicode.utf32_to_utf8_be = utf32_to_utf8_be
unicode.utf32_to_utf8_le = utf32_to_utf8_le
unicode.utf16_to_utf8_be = utf16_to_utf8_be
unicode.utf16_to_utf8_le = utf16_to_utf8_le
function unicode.utf8_to_utf8(t)
return type(t) == "string" and utfsplitlines(t) or t
end
function unicode.utf16_to_utf8(t,endian)
return endian and utf16_to_utf8_be(t) or utf16_to_utf8_le(t) or t
end
function unicode.utf32_to_utf8(t,endian)
return endian and utf32_to_utf8_be(t) or utf32_to_utf8_le(t) or t
end
local function little(c)
local b = byte(c)
if b < 0x10000 then
return char(b%256,b/256)
else
b = b - 0x10000
local b1, b2 = b/1024 + 0xD800, b%1024 + 0xDC00
return char(b1%256,b1/256,b2%256,b2/256)
end
end
local function big(c)
local b = byte(c)
if b < 0x10000 then
return char(b/256,b%256)
else
b = b - 0x10000
local b1, b2 = b/1024 + 0xD800, b%1024 + 0xDC00
return char(b1/256,b1%256,b2/256,b2%256)
end
end
function unicode.utf8_to_utf16(str,littleendian)
if littleendian then
return char(255,254) .. utfgsub(str,".",little)
else
return char(254,255) .. utfgsub(str,".",big)
end
end
function unicode.utfcodes(str)
local t, n = { }, 0
for u in utfvalues(str) do
n = n + 1
t[n] = format("0x%04X",u)
end
return concat(t,separator or " ")
end
function unicode.ustring(s)
return format("U+%05X",type(s) == "number" and s or utfbyte(s))
end
function unicode.xstring(s)
return format("0x%05X",type(s) == "number" and s or utfbyte(s))
end
--~ print(unicode.utfcodes(str))
local lpegmatch = lpeg.match
local patterns = lpeg.patterns
local utftype = patterns.utftype
function unicode.filetype(data)
return data and lpegmatch(utftype,data) or "unknown"
end
local toentities = lpeg.Cs (
(
patterns.utf8one
+ (
patterns.utf8two
+ patterns.utf8three
+ patterns.utf8four
) / function(s) local b = utfbyte(s) if b < 127 then return s else return format("&#%X;",b) end end
)^0
)
patterns.toentities = toentities
function utf.toentities(str)
return lpegmatch(toentities,str)
end
--~ local utfchr = { } -- 60K -> 2.638 M extra mem but currently not called that often (on latin)
--~
--~ setmetatable(utfchr, { __index = function(t,k) local v = utfchar(k) t[k] = v return v end } )
--~
--~ collectgarbage("collect")
--~ local u = collectgarbage("count")*1024
--~ local t = os.clock()
--~ for i=1,1000 do
--~ for i=1,600 do
--~ local a = utfchr[i]
--~ end
--~ end
--~ print(os.clock()-t,collectgarbage("count")*1024-u)
--~ collectgarbage("collect")
--~ local t = os.clock()
--~ for i=1,1000 do
--~ for i=1,600 do
--~ local a = utfchar(i)
--~ end
--~ end
--~ print(os.clock()-t,collectgarbage("count")*1024-u)
--~ local byte = string.byte
--~ local utfchar = utf.char
--~ local lpegmatch = lpeg.match, lpeg.P, lpeg.C, lpeg.R, lpeg.Cs
local P, C, R, Cs = lpeg.P, lpeg.C, lpeg.R, lpeg.Cs
local one = P(1)
local two = C(1) * C(1)
local four = C(R(utfchar(0xD8),utfchar(0xFF))) * C(1) * C(1) * C(1)
local pattern = P("\254\255") * Cs( (
four / function(a,b,c,d)
local ab = 0xFF * byte(a) + byte(b)
local cd = 0xFF * byte(c) + byte(d)
return utfchar((ab-0xD800)*0x400 + (cd-0xDC00) + 0x10000)
end
+ two / function(a,b)
return utfchar(byte(a)*256 + byte(b))
end
+ one
)^1 )
+ P("\255\254") * Cs( (
four / function(b,a,d,c)
local ab = 0xFF * byte(a) + byte(b)
local cd = 0xFF * byte(c) + byte(d)
return utfchar((ab-0xD800)*0x400 + (cd-0xDC00) + 0x10000)
end
+ two / function(b,a)
return utfchar(byte(a)*256 + byte(b))
end
+ one
)^1 )
function string.toutf(s)
return lpegmatch(pattern,s) or s -- todo: utf32
end
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