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## core string functions ##
length(s::String) = error("you must implement length(",typeof(s),")")
next(s::String, i::Int) = error("you must implement next(",typeof(s),",Int)")
next(s::DirectIndexString, i::Int) = (s[i],i+1)
next(s::String, i::Integer) = next(s,int(i))
## generic supplied functions ##
start(s::String) = 1
done(s::String,i) = (i > length(s))
numel(s::String) = length(s)
isempty(s::String) = done(s,start(s))
ref(s::String, i::Int) = next(s,i)[1]
ref(s::String, i::Integer) = s[int(i)]
ref(s::String, x::Real) = s[iround(x)]
ref{T<:Integer}(s::String, r::Range1{T}) = s[int(first(r)):int(last(r))]
symbol(s::String) = symbol(cstring(s))
string(s::String) = s
print(s::String) = for c=s; print(c); end
print(x...) = for i=x; print(i); end
println(args...) = print(args..., '\n')
show(s::String) = print_quoted(s)
(*)(s::String...) = strcat(s...)
(^)(s::String, r::Integer) = repeat(s,r)
size(s::String) = (length(s),)
size(s::String, d::Integer) = d==1 ? length(s) :
error("in size: dimension ",d," out of range")
strlen(s::DirectIndexString) = length(s)
function strlen(s::String)
i = start(s)
if done(s,i)
return 0
end
n = 1
while true
c, j = next(s,i)
if done(s,j)
return n
end
n += 1
i = j
end
end
isvalid(s::DirectIndexString, i::Integer) = (start(s) <= i <= length(s))
function isvalid(s::String, i::Integer)
try
next(s,i)
true
catch
false
end
end
prevind(s::DirectIndexString, i::Integer) = i-1
thisind(s::DirectIndexString, i::Integer) = i
nextind(s::DirectIndexString, i::Integer) = i+1
prevind(s::String, i::Integer) = thisind(s,thisind(s,i)-1)
function thisind(s::String, i::Integer)
for j = i:-1:1
if isvalid(s,j)
return j
end
end
return 0 # out of range
end
function nextind(s::String, i::Integer)
for j = i+1:length(s)
if isvalid(s,j)
return j
end
end
length(s)+1 # out of range
end
ind2chr(s::DirectIndexString, i::Integer) = i
chr2ind(s::DirectIndexString, i::Integer) = i
function ind2chr(s::String, i::Integer)
s[i] # throws error if invalid
j = 1
k = start(s)
while true
c, l = next(s,k)
if i <= k
return j
end
j += 1
k = l
end
end
function chr2ind(s::String, i::Integer)
if i < 1
return i
end
j = 1
k = start(s)
while true
c, l = next(s,k)
if i == j
return k
end
j += 1
k = l
end
end
function strchr(s::String, c::Char, i::Integer)
i = nextind(s,i)
while !done(s,i)
d, j = next(s,i)
if c == d
return i
end
i = j
end
return 0
end
strchr(s::String, c::Char) = strchr(s, c, start(s))
contains(s::String, c::Char) = (strchr(s,c)!=0)
function chars(s::String)
cx = Array(Char,strlen(s))
i = 0
for c in s
cx[i += 1] = c
end
return cx
end
function cmp(a::String, b::String)
i = start(a)
j = start(b)
while !done(a,i) && !done(b,i)
c, i = next(a,i)
d, j = next(b,j)
if c != d
return c < d ? -1 : +1
end
end
done(a,i) && !done(b,j) ? -1 :
!done(a,i) && done(b,j) ? +1 : 0
end
isequal(a::String, b::String) = cmp(a,b) == 0
isless(a::String, b::String) = cmp(a,b) < 0
# faster comparisons for byte strings
cmp(a::ByteString, b::ByteString) = lexcmp(a.data, b.data)
isequal(a::ByteString, b::ByteString) = length(a)==length(b) && cmp(a,b)==0
## character column width function ##
charwidth(c::Char) = max(0,int(ccall(:wcwidth, Int32, (Char,), c)))
strwidth(s::String) = (w=0; for c in s; w += charwidth(c); end; w)
strwidth(s::ByteString) = ccall(:u8_strwidth, Int, (Ptr{Uint8},), s.data)
# TODO: implement and use u8_strnwidth that takes a length argument
## generic string uses only length and next ##
type GenericString <: String
string::String
end
length(s::GenericString) = length(s.string)
next(s::GenericString, i::Int) = next(s.string, i)
## plain old character arrays ##
type CharString <: String
chars::Array{Char,1}
CharString(a::Array{Char,1}) = new(a)
CharString(c::Char...) = new([ c[i] | i=1:length(c) ])
end
CharString(x...) = CharString(map(char,x)...)
next(s::CharString, i::Int) = (s.chars[i], i+1)
length(s::CharString) = length(s.chars)
strlen(s::CharString) = length(s)
string(c::Char) = CharString(c)
string(c::Char, x::Char...) = CharString(c, x...)
## substrings reference original strings ##
type SubString <: String
string::String
offset::Int
length::Int
SubString(s::String, i::Int, j::Int) = new(s, i-1, j-i+1)
SubString(s::SubString, i::Int, j::Int) =
new(s.string, i-1+s.offset, j-i+1)
end
SubString(s::String, i::Integer, j::Integer) = SubString(s, int(i), int(j))
function next(s::SubString, i::Int)
if i < 1 || i > s.length
error("string index out of bounds")
end
c, i = next(s.string, i+s.offset)
c, i-s.offset
end
length(s::SubString) = s.length
# TODO: strlen(s::SubString) = ??
# default implementation will work but it's slow
# can this be delegated efficiently somehow?
# that may require additional string interfaces
function ref(s::String, r::Range1{Int})
if first(r) < 1 || length(s) < last(r)
error("in substring slice: index out of range")
end
SubString(s, first(r), last(r))
end
## efficient representation of repeated strings ##
type RepString <: String
string::String
repeat::Integer
end
length(s::RepString) = length(s.string)*s.repeat
strlen(s::RepString) = strlen(s.string)*s.repeat
function next(s::RepString, i::Int)
if i < 1 || i > length(s)
error("string index out of bounds")
end
j = mod1(i,length(s.string))
c, k = next(s.string, j)
c, k-j+i
end
function repeat(s::String, r::Integer)
r < 0 ? error("can't repeat a string ",r," times") :
r == 0 ? "" :
r == 1 ? s :
RepString(s,r)
end
## reversed strings without data movement ##
type RevString <: String
string::String
end
length(s::RevString) = length(s.string)
strlen(s::RevString) = strlen(s.string)
start(s::RevString) = (n=length(s); n-thisind(s.string,n)+1)
function next(s::RevString, i::Int)
n = length(s); j = n-i+1
(s.string[j], n-thisind(s.string,j-1)+1)
end
reverse(s::String) = RevString(s)
reverse(s::RevString) = s.string
## ropes for efficient concatenation, etc. ##
# Idea: instead of this standard binary tree structure,
# how about we keep an array of substrings, with an
# offset array. We can do binary search on the offset
# array so we get O(log(n)) indexing time still, but we
# can compute the offsets lazily and avoid all the
# futzing around while the string is being constructed.
type RopeString <: String
head::String
tail::String
depth::Int32
length::Int
RopeString(h::RopeString, t::RopeString) =
depth(h.tail) + depth(t) < depth(h.head) ?
RopeString(h.head, RopeString(h.tail, t)) :
new(h, t, max(h.depth,t.depth)+1, length(h)+length(t))
RopeString(h::RopeString, t::String) =
depth(h.tail) < depth(h.head) ?
RopeString(h.head, RopeString(h.tail, t)) :
new(h, t, h.depth+1, length(h)+length(t))
RopeString(h::String, t::RopeString) =
depth(t.head) < depth(t.tail) ?
RopeString(RopeString(h, t.head), t.tail) :
new(h, t, t.depth+1, length(h)+length(t))
RopeString(h::String, t::String) =
new(h, t, 1, length(h)+length(t))
end
depth(s::String) = 0
depth(s::RopeString) = s.depth
function next(s::RopeString, i::Int)
if i <= length(s.head)
return next(s.head, i)
else
c, j = next(s.tail, i-length(s.head))
return c, j+length(s.head)
end
end
length(s::RopeString) = s.length
strlen(s::RopeString) = strlen(s.head) + strlen(s.tail)
strcat() = ""
strcat(s::String) = s
strcat(x...) = strcat(map(string,x)...)
strcat(s::String, t::String...) =
(t = strcat(t...); isempty(s) ? t : isempty(t) ? s : RopeString(s, t))
print(s::RopeString) = print(s.head, s.tail)
## transformed strings ##
type TransformedString <: String
transform::Function
string::String
end
length(s::TransformedString) = length(s.string)
strlen(s::TransformedString) = strlen(s.string)
function next(s::TransformedString, i::Int)
c, j = next(s.string,i)
c = s.transform(c, i)
return c, j
end
## uppercase and lowercase transformations ##
uc(c::Char) = ccall(:towupper, Char, (Char,), c)
lc(c::Char) = ccall(:towlower, Char, (Char,), c)
uc(s::String) = TransformedString((c,i)->uc(c), s)
lc(s::String) = TransformedString((c,i)->lc(c), s)
ucfirst(s::String) = TransformedString((c,i)->i==1 ? uc(c) : c, s)
lcfirst(s::String) = TransformedString((c,i)->i==1 ? lc(c) : c, s)
## conversion of general objects to strings ##
string(x) = print_to_string(show, x)
cstring(x...) = print_to_string(print, x...)
function cstring(p::Ptr{Uint8})
p == C_NULL ? error("cannot convert NULL to string") :
ccall(:jl_cstr_to_string, Any, (Ptr{Uint8},), p)::ByteString
end
## string promotion rules ##
promote_rule(::Type{UTF8String} , ::Type{ASCIIString}) = UTF8String
promote_rule(::Type{UTF8String} , ::Type{CharString} ) = UTF8String
promote_rule(::Type{ASCIIString}, ::Type{CharString} ) = UTF8String
## printing literal quoted string data ##
# TODO: this is really the inverse of print_unbackslashed
function print_quoted_literal(s::String)
print('"')
for c = s; c == '"' ? print("\\\"") : print(c); end
print('"')
end
## string escaping & unescaping ##
escape_nul(s::String, i::Int) =
!done(s,i) && '0' <= next(s,i)[1] <= '7' ? L"\x00" : L"\0"
is_hex_digit(c::Char) = '0'<=c<='9' || 'a'<=c<='f' || 'A'<=c<='F'
need_full_hex(s::String, i::Int) = !done(s,i) && is_hex_digit(next(s,i)[1])
function print_escaped(s::String, esc::String)
i = start(s)
while !done(s,i)
c, j = next(s,i)
c == '\0' ? print(escape_nul(s,j)) :
c == '\e' ? print(L"\e") :
c == '\\' ? print("\\\\") :
contains(esc,c) ? print('\\', c) :
iswprint(c) ? print(c) :
7 <= c <= 13 ? print('\\', "abtnvfr"[c-6]) :
c <= '\x7f' ? print(L"\x", hex(c, 2)) :
c <= '\uffff' ? print(L"\u", hex(c, need_full_hex(s,j) ? 4 : 2)) :
print(L"\U", hex(c, need_full_hex(s,j) ? 8 : 4))
i = j
end
end
escape_string(s::String) = print_to_string(length(s), print_escaped, s, "\"")
print_quoted(s::String) = (print('"'); print_escaped(s, "\"\$"); print('"'))
#" # work around syntax highlighting problem
quote_string(s::String) = print_to_string(length(s)+2, print_quoted, s)
# bare minimum unescaping function unescapes only given characters
function print_unescaped_chars(s::String, esc::String)
if !contains(esc,'\\')
esc = strcat("\\", esc)
end
i = start(s)
while !done(s,i)
c, i = next(s,i)
if c == '\\' && !done(s,i) && contains(esc,s[i])
c, i = next(s,i)
end
print(c)
end
end
unescape_chars(s::String, esc::String) =
print_to_string(length(s), print_unescaped_chars, s, esc)
# general unescaping of traditional C and Unicode escape sequences
function print_unescaped(s::String)
i = start(s)
while !done(s,i)
c, i = next(s,i)
if !done(s,i) && c == '\\'
c, i = next(s,i)
if c == 'x' || c == 'u' || c == 'U'
n = k = 0
m = c == 'x' ? 2 :
c == 'u' ? 4 : 8
while (k+=1) <= m && !done(s,i)
c, j = next(s,i)
n = '0' <= c <= '9' ? n<<4 + c-'0' :
'a' <= c <= 'f' ? n<<4 + c-'a'+10 :
'A' <= c <= 'F' ? n<<4 + c-'A'+10 : break
i = j
end
if k == 1
error("\\x used with no following hex digits")
end
if m == 2 # \x escape sequence
write(uint8(n))
else
print(char(n))
end
elseif '0' <= c <= '7'
k = 1
n = c-'0'
while (k+=1) <= 3 && !done(s,i)
c, j = next(s,i)
n = '0' <= c <= '7' ? n<<3 + c-'0' : break
i = j
end
if n > 255
error("octal escape sequence out of range")
end
write(uint8(n))
else
print(c == 'a' ? '\a' :
c == 'b' ? '\b' :
c == 't' ? '\t' :
c == 'n' ? '\n' :
c == 'v' ? '\v' :
c == 'f' ? '\f' :
c == 'r' ? '\r' :
c == 'e' ? '\e' : c)
end
else
print(c)
end
end
end
unescape_string(s::String) = print_to_string(length(s), print_unescaped, s)
## checking UTF-8 & ACSII validity ##
byte_string_classify(s::ByteString) =
ccall(:u8_isvalid, Int32, (Ptr{Uint8}, Int), s.data, length(s))
# 0: neither valid ASCII nor UTF-8
# 1: valid ASCII
# 2: valid UTF-8
is_valid_ascii(s::ByteString) = byte_string_classify(s) == 1
is_valid_utf8 (s::ByteString) = byte_string_classify(s) != 0
check_ascii(s::ByteString) = is_valid_ascii(s) ? s : error("invalid ASCII sequence")
check_utf8 (s::ByteString) = is_valid_utf8(s) ? s : error("invalid UTF-8 sequence")
## string interpolation parsing ##
function _jl_interp_parse(s::String, unescape::Function, printer::Function)
sx = {}
i = j = start(s)
while !done(s,j)
c, k = next(s,j)
if c == '$'
if !isempty(s[i:j-1])
push(sx, unescape(s[i:j-1]))
end
ex, j = parseatom(s,k)
push(sx, ex)
i = j
elseif c == '\\' && !done(s,k)
if s[k] == '$'
if !isempty(s[i:j-1])
push(sx, unescape(s[i:j-1]))
end
i = k
end
c, j = next(s,k)
else
j = k
end
end
if !isempty(s[i:])
push(sx, unescape(s[i:j-1]))
end
length(sx) == 1 && isa(sx[1],ByteString) ? sx[1] :
expr(:call, :print_to_string, printer, sx...)
end
_jl_interp_parse(s::String, u::Function) = _jl_interp_parse(s, u, print)
_jl_interp_parse(s::String) = _jl_interp_parse(s, x->check_utf8(unescape_string(x)))
function _jl_interp_parse_bytes(s::String)
writer(x...) = for w=x; write(w); end
_jl_interp_parse(s, unescape_string, writer)
end
## core string macros ##
macro str(s); _jl_interp_parse(s); end
macro S_str(s); _jl_interp_parse(s); end
macro I_str(s); _jl_interp_parse(s, x->unescape_chars(x,"\"")); end
macro E_str(s); check_utf8(unescape_string(s)); end
macro B_str(s); _jl_interp_parse_bytes(s); end
macro b_str(s); ex = _jl_interp_parse_bytes(s); :(($ex).data); end
## shell-like command parsing ##
function _jl_shell_parse(s::String, interp::Bool)
in_single_quotes = false
in_double_quotes = false
args = {}
arg = {}
i = start(s)
j = i
function update_arg(x)
if !isa(x,String) || !isempty(x)
push(arg, x)
end
end
function append_arg()
if isempty(arg); arg = {"",}; end
push(args, arg)
arg = {}
end
while !done(s,j)
c, k = next(s,j)
if !in_single_quotes && !in_double_quotes && iswspace(c)
update_arg(s[i:j-1])
append_arg()
j = k
while !done(s,j)
c, k = next(s,j)
if !iswspace(c)
i = j
break
end
j = k
end
elseif interp && !in_single_quotes && c == '$'
update_arg(s[i:j-1]); i = k; j = k
if done(s,k)
error("\$ right before end of command")
end
if iswspace(s[k])
error("space not allowed right after \$")
end
ex, j = parseatom(s,j)
update_arg(ex); i = j
else
if !in_double_quotes && c == '\''
in_single_quotes = !in_single_quotes
update_arg(s[i:j-1]); i = k
elseif !in_single_quotes && c == '"'
in_double_quotes = !in_double_quotes
update_arg(s[i:j-1]); i = k
elseif c == '\\'
if in_double_quotes
if done(s,k)
error("unterminated double quote")
end
if s[k] == '"' || s[k] == '$'
update_arg(s[i:j-1]); i = k
c, k = next(s,k)
end
elseif !in_single_quotes
if done(s,k)
error("dangling backslash")
end
update_arg(s[i:j-1]); i = k
c, k = next(s,k)
end
end
j = k
end
end
if in_single_quotes; error("unterminated single quote"); end
if in_double_quotes; error("unterminated double quote"); end
update_arg(s[i:])
append_arg()
if !interp
return args
end
# construct an expression
exprs = {}
for arg in args
push(exprs, expr(:tuple, arg))
end
expr(:tuple,exprs)
end
_jl_shell_parse(s::String) = _jl_shell_parse(s,true)
function shell_split(s::String)
parsed = _jl_shell_parse(s,false)
args = String[]
for arg in parsed
push(args, strcat(arg...))
end
args
end
function print_shell_word(word::String)
if isempty(word)
print("''")
end
has_single = false
has_special = false
for c in word
if iswspace(c) || c=='\\' || c=='\'' || c=='"' || c=='$'
has_special = true
if c == '\''
has_single = true
end
end
end
if !has_special
print(word)
elseif !has_single
print('\'', word, '\'')
else
print('"')
for c in word
if c == '"' || c == '$'
print('\\')
end
print(c)
end
print('"')
end
end
function print_shell_escaped(cmd::String, args::String...)
print_shell_word(cmd)
for arg in args
print(' ')
print_shell_word(arg)
end
end
shell_escape(cmd::String, args::String...) =
print_to_string(print_shell_escaped, cmd, args...)
## interface to parser ##
function parse(s::String, pos, greedy)
# returns (expr, end_pos). expr is () in case of parse error.
ex, pos = ccall(:jl_parse_string, Any,
(Ptr{Uint8},Int32,Int32),
cstring(s), int32(pos-1), int32(greedy ? 1:0))
if isa(ex,Expr) && is(ex.head,:error)
throw(ParseError(ex.args[1]))
end
if ex == (); throw(ParseError("end of input")); end
ex, pos+1 # C is zero-based, Julia is 1-based
end
parse(s::String) = parse(s, 1, true)
parse(s::String, pos) = parse(s, pos, true)
parseatom(s::String) = parse(s, 1, false)
parseatom(s::String, pos) = parse(s, pos, false)
## miscellaneous string functions ##
function lpad(s::String, n::Integer, p::String)
m = n - strlen(s)
if m <= 0; return s; end
l = strlen(p)
if l==1
return p^m * s
end
q = div(m,l)
r = m - q*l
cstring(p^q*p[1:chr2ind(p,r)]*s)
end
function rpad(s::String, n::Integer, p::String)
m = n - strlen(s)
if m <= 0; return s; end
l = strlen(p)
if l==1
return s * p^m
end
q = div(m,l)
r = m - q*l
cstring(s*p^q*p[1:chr2ind(p,r)])
end
lpad(s, n::Integer, p) = lpad(string(s), n, string(p))
rpad(s, n::Integer, p) = rpad(string(s), n, string(p))
lpad(s, n::Integer) = lpad(string(s), n, " ")
rpad(s, n::Integer) = rpad(string(s), n, " ")
function split(s::String, delims, include_empty::Bool)
i = 1
strs = String[]
len = length(s)
while true
tokstart = tokend = i
while !done(s,i)
(c,i) = next(s,i)
if contains(delims, c)
break
end
tokend = i
end
tok = s[tokstart:(tokend-1)]
if include_empty || !isempty(tok)
push(strs, tok)
end
if !((i <= len) || (i==len+1 && tokend!=i))
break
end
end
strs
end
split(s::String, x) = split(s, x, true)
split(s::String, x::Char, incl::Bool) = split(s, (x,), incl)
function print_joined(strings, delim, last)
i = start(strings)
if done(strings,i)
return
end
str, i = next(strings,i)
print(str)
while !done(strings,i)
str, i = next(strings,i)
print(done(strings,i) ? last : delim)
print(str)
end
end
function print_joined(strings, delim)
i = start(strings)
while !done(strings,i)
str, i = next(strings,i)
print(str)
if !done(strings,i)
print(delim)
end
end
end
print_joined(strings) = print_joined(strings, "")
join(args...) = print_to_string(print_joined, args...)
chop(s::String) = s[1:thisind(s,length(s))-1]
chomp(s::String) = (i=thisind(s,length(s)); s[i]=='\n' ? s[1:i-1] : s)
chomp(s::ByteString) = s.data[end]==0x0a ? s[1:end-1] : s
## string to integer functions ##
function parse_int{T<:Integer}(::Type{T}, s::String, base::Integer)
if !(2 <= base <= 36); error("invalid base: ",base); end
i = start(s)
if done(s,i)
error("premature end of integer (in ",show_to_string(s),")")
end
c,i = next(s,i)
sgn = one(T)
if T <: Signed && c == '-'
sgn = -sgn
if done(s,i)
error("premature end of integer (in ",show_to_string(s),")")
end
c,i = next(s,i)
end
base = convert(T,base)
n::T = 0
while true
d = '0' <= c <= '9' ? c-'0' :
'A' <= c <= 'Z' ? c-'A'+10 :
'a' <= c <= 'z' ? c-'a'+10 : typemax(Int)
if d >= base
error(show_to_string(c)," is not a valid digit (in ",show_to_string(s),")")
end
# TODO: overflow detection?
n = n*base + d
if done(s,i)
break
end
c,i = next(s,i)
end
return flipsign(n,sgn)
end
parse_int(s::String, base::Integer) = parse_int(Int,s,base)
parse_int(T::Type, s::String) = parse_int(T,s,10)
parse_int(s::String) = parse_int(Int,s,10)
parse_bin(T::Type, s::String) = parse_int(T,s,2)
parse_oct(T::Type, s::String) = parse_int(T,s,8)
parse_hex(T::Type, s::String) = parse_int(T,s,16)
parse_bin(s::String) = parse_int(Int,s,2)
parse_oct(s::String) = parse_int(Int,s,8)
parse_hex(s::String) = parse_int(Int,s,16)
integer (s::String) = int(s)
unsigned(s::String) = uint(s)
int (s::String) = parse_int(Int,s)
uint (s::String) = parse_int(Uint,s)
int8 (s::String) = parse_int(Int8,s)
uint8 (s::String) = parse_int(Uint8,s)
int16 (s::String) = parse_int(Int16,s)
uint16 (s::String) = parse_int(Uint16,s)
int32 (s::String) = parse_int(Int32,s)
uint32 (s::String) = parse_int(Uint32,s)
int64 (s::String) = parse_int(Int64,s)
uint64 (s::String) = parse_int(Uint64,s)
## integer to string functions ##
const _jl_dig_syms = "0123456789abcdefghijklmnopqrstuvwxyz".data
function int2str(n::Union(Int64,Uint64), b::Integer, l::Int)
if b < 2 || b > 36; error("int2str: invalid base ", b); end
neg = n < 0
n = unsigned(abs(n))
b = convert(typeof(n), b)
ndig = ndigits(n, b)
sz = max(convert(Int, ndig), l) + neg
data = Array(Uint8, sz)
i = sz
if ispow2(b)
digmask = b-1
shift = trailing_zeros(b)
while i > neg
ch = n & digmask
data[i] = _jl_dig_syms[int(ch)+1]
n >>= shift
i -= 1
end
else
while i > neg
ch = n % b
data[i] = _jl_dig_syms[int(ch)+1]
n = div(n,b)
i -= 1
end
end
if neg
data[1] = '-'
end
ASCIIString(data)
end
int2str(n::Integer, b::Integer) = int2str(n, b, 0)
int2str(n::Integer, b::Integer, l::Int) = int2str(int64(n), b, l)
string(x::Signed) = dec(int64(x))
cstring(x::Signed) = dec(int64(x))
## string to float functions ##
function float64_isvalid(s::String, out::Array{Float64,1})
s = cstring(s)
return (ccall(:jl_strtod, Int32, (Ptr{Uint8},Ptr{Float64}), s, out)==0)
end
function float32_isvalid(s::String, out::Array{Float32,1})
s = cstring(s)
return (ccall(:jl_strtof, Int32, (Ptr{Uint8},Ptr{Float32}), s, out)==0)
end
begin
local tmp::Array{Float64,1} = Array(Float64,1)
local tmpf::Array{Float32,1} = Array(Float32,1)
global float64, float32
function float64(s::String)
if !float64_isvalid(s, tmp)
throw(ArgumentError("float64(String): invalid number format"))
end
return tmp[1]
end
function float32(s::String)
if !float32_isvalid(s, tmpf)
throw(ArgumentError("float32(String): invalid number format"))
end
return tmpf[1]
end
end
float(x::String) = float64(x)
# copying a byte string (generally not needed due to "immutability")
strcpy{T<:ByteString}(s::T) = T(copy(s.data))
# lexicographically compare byte arrays (used by Latin-1 and UTF-8)
function lexcmp(a::Array{Uint8,1}, b::Array{Uint8,1})
c = ccall(:memcmp, Int32,
(Ptr{Uint8}, Ptr{Uint8}, Uint),
a, b, uint(min(length(a),length(b))))
c < 0 ? -1 : c > 0 ? +1 : cmp(length(a),length(b))
end
# find the index of a byte in a byte array
function memchr(a::Array{Uint8,1}, b::Integer)
p = pointer(a)
q = ccall(:memchr, Ptr{Uint8},
(Ptr{Uint8}, Int32, Uint),
p, int32(b), uint(length(a)))
q == C_NULL ? 0 : q - p + 1
end
# concatenate byte arrays into a single array
memcat() = Array(Uint8,0)
memcat(a::Array{Uint8,1}) = copy(a)
function memcat(arrays::Array{Uint8,1}...)
n = 0
for a in arrays
n += length(a)
end
arr = Array(Uint8, n)
ptr = pointer(arr)
offset = 0
for a in arrays
ccall(:memcpy, Ptr{Uint8},
(Ptr{Uint8}, Ptr{Uint8}, Uint),
ptr + offset, pointer(a), uint(length(a)))
offset += length(a)
end
return arr
end
# concatenate the data fields of byte strings
memcat(s::ByteString) = memcat(s.data)
function memcat(strs::ByteString...)
n = 0
for s in strs
n += length(s)
end
data = Array(Uint8, n)
ptr = pointer(data)
offset = 0
for s in strs
ccall(:memcpy, Ptr{Uint8},
(Ptr{Uint8}, Ptr{Uint8}, Uint),
ptr + offset, pointer(s.data), uint(length(s)))
offset += length(s)
end
data
end
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