/usr/share/julia/base/utf8.jl is in julia 0.2.1+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 | ## from base/boot.jl:
#
# immutable UTF8String <: String
# data::Array{Uint8,1}
# end
#
## basic UTF-8 decoding & iteration ##
const utf8_offset = [
0x00000000, 0x00003080,
0x000e2080, 0x03c82080,
0xfa082080, 0x82082080,
]
const utf8_trailing = [
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5,
]
is_utf8_start(byte::Uint8) = ((byte&0xc0)!=0x80)
## required core functionality ##
function endof(s::UTF8String)
d = s.data
i = length(d)
i == 0 && return i
while !is_utf8_start(d[i])
i -= 1
end
i
end
length(s::UTF8String) = int(ccall(:u8_strlen, Csize_t, (Ptr{Uint8},), s.data))
function getindex(s::UTF8String, i::Int)
# potentially faster version
# d = s.data
# a::Uint32 = d[i]
# if a < 0x80; return char(a); end
# #if a&0xc0==0x80; return '\ufffd'; end
# b::Uint32 = a<<6 + d[i+1]
# if a < 0xe0; return char(b - 0x00003080); end
# c::Uint32 = b<<6 + d[i+2]
# if a < 0xf0; return char(c - 0x000e2080); end
# return char(c<<6 + d[i+3] - 0x03c82080)
d = s.data
b = d[i]
if !is_utf8_start(b)
j = i-1
while 0 < j && !is_utf8_start(d[j])
j -= 1
end
if 0 < j && i <= j+utf8_trailing[d[j]+1] <= length(d)
# b is a continuation byte of a valid UTF-8 character
error("invalid UTF-8 character index")
end
return '\ufffd'
end
trailing = utf8_trailing[b+1]
if length(d) < i + trailing
return '\ufffd'
end
c::Uint32 = 0
for j = 1:trailing+1
c <<= 6
c += d[i]
i += 1
end
c -= utf8_offset[trailing+1]
char(c)
end
# this is a trick to allow inlining and tuple elision
next(s::UTF8String, i::Int) = (s[i], i+1+utf8_trailing[s.data[i]+1])
function first_utf8_byte(c::Char)
c < 0x80 ? uint8(c) :
c < 0x800 ? uint8((c>>6 )|0xc0) :
c < 0x10000 ? uint8((c>>12)|0xe0) :
uint8((c>>18)|0xf0)
end
## overload methods for efficiency ##
sizeof(s::UTF8String) = sizeof(s.data)
isvalid(s::UTF8String, i::Integer) =
(1 <= i <= endof(s.data)) && is_utf8_start(s.data[i])
function getindex(s::UTF8String, r::Range1{Int})
a, b = first(r), last(r)
i = isvalid(s,a) ? a : nextind(s,a)
j = b < endof(s) ? nextind(s,b)-1 : endof(s.data)
UTF8String(s.data[i:j])
end
function search(s::UTF8String, c::Char, i::Integer)
if c < 0x80 return search(s.data, uint8(c), i) end
while true
i = search(s.data, first_utf8_byte(c), i)
if i==0 || s[i]==c return i end
i = next(s,i)[2]
end
end
function rsearch(s::UTF8String, c::Char, i::Integer)
if c < 0x80 return rsearch(s.data, uint8(c), i) end
b = first_utf8_byte(c)
while true
i = rsearch(s.data, b, i)
if i==0 || s[i]==c return i end
i = prevind(s,i)
end
end
function string(a::ByteString...)
# ^^ at least one must be UTF-8 or the ASCII-only method would get called
data = Array(Uint8,0)
for d in a
append!(data,d.data)
end
UTF8String(data)
end
ucfirst(s::UTF8String) = string(uppercase(s[1]), s[2:])
lcfirst(s::UTF8String) = string(lowercase(s[1]), s[2:])
function reverse(s::UTF8String)
out = similar(s.data)
if ccall(:u8_reverse, Cint, (Ptr{Uint8}, Ptr{Uint8}, Csize_t),
out, s.data, length(out)) == 1
error("invalid UTF-8 data")
end
UTF8String(out)
end
## outputing UTF-8 strings ##
print(io::IO, s::UTF8String) = (write(io, s.data);nothing)
write(io::IO, s::UTF8String) = write(io, s.data)
## transcoding to UTF-8 ##
utf8(x) = convert(UTF8String, x)
convert(::Type{UTF8String}, s::UTF8String) = s
convert(::Type{UTF8String}, s::ASCIIString) = UTF8String(s.data)
convert(::Type{UTF8String}, a::Array{Uint8,1}) = is_valid_utf8(a) ? UTF8String(a) : error("invalid UTF-8 sequence")
function convert(::Type{UTF8String}, a::Array{Uint8,1}, invalids_as::String)
l = length(a)
idx = 1
iscopy = false
while idx <= l
if is_utf8_start(a[idx])
nextidx = idx+1+utf8_trailing[a[idx]+1]
(nextidx <= (l+1)) && (idx = nextidx; continue)
end
!iscopy && (a = copy(a); iscopy = true)
endn = idx
while endn <= l
is_utf8_start(a[endn]) && break
endn += 1
end
(endn > idx) && (endn -= 1)
splice!(a, idx:endn, invalids_as.data)
l = length(a)
end
UTF8String(a)
end
convert(::Type{UTF8String}, s::String) = utf8(bytestring(s))
# The last case is the replacement character 0xfffd (3 bytes)
utf8sizeof(c::Char) = c < 0x80 ? 1 : c < 0x800 ? 2 : c < 0x10000 ? 3 : c < 0x110000 ? 4 : 3
|