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# This file is a part of Julia. License is MIT: http://julialang.org/license
export
abspath,
basename,
dirname,
expanduser,
homedir,
isabspath,
isdirpath,
joinpath,
normpath,
realpath,
relpath,
splitdir,
splitdrive,
splitext
if is_unix()
const path_separator = "/"
const path_separator_re = r"/+"
const path_absolute_re = r"^/"
const path_directory_re = r"(?:^|/)\.{0,2}$"
const path_dir_splitter = r"^(.*?)(/+)([^/]*)$"
const path_ext_splitter = r"^((?:.*/)?(?:\.|[^/\.])[^/]*?)(\.[^/\.]*|)$"
splitdrive(path::String) = ("",path)
homedir() = ENV["HOME"]
elseif is_windows()
const path_separator = "\\"
const path_separator_re = r"[/\\]+"
const path_absolute_re = r"^(?:\w+:)?[/\\]"
const path_directory_re = r"(?:^|[/\\])\.{0,2}$"
const path_dir_splitter = r"^(.*?)([/\\]+)([^/\\]*)$"
const path_ext_splitter = r"^((?:.*[/\\])?(?:\.|[^/\\\.])[^/\\]*?)(\.[^/\\\.]*|)$"
function splitdrive(path::String)
m = match(r"^(\w+:|\\\\\w+\\\w+|\\\\\?\\UNC\\\w+\\\w+|\\\\\?\\\w+:|)(.*)$", path)
String(m.captures[1]), String(m.captures[2])
end
homedir() = get(ENV,"HOME",string(ENV["HOMEDRIVE"],ENV["HOMEPATH"]))
else
error("path primitives for this OS need to be defined")
end
isabspath(path::String) = ismatch(path_absolute_re, path)
isdirpath(path::String) = ismatch(path_directory_re, splitdrive(path)[2])
function splitdir(path::String)
a, b = splitdrive(path)
m = match(path_dir_splitter,b)
m === nothing && return (a,b)
a = string(a, isempty(m.captures[1]) ? m.captures[2][1] : m.captures[1])
a, String(m.captures[3])
end
dirname(path::AbstractString) = splitdir(path)[1]
basename(path::AbstractString) = splitdir(path)[2]
function splitext(path::String)
a, b = splitdrive(path)
m = match(path_ext_splitter, b)
m === nothing && return (path,"")
a*m.captures[1], String(m.captures[2])
end
function pathsep(paths::AbstractString...)
for path in paths
m = match(path_separator_re, String(path))
m !== nothing && return m.match[1:1]
end
return path_separator
end
joinpath(a::AbstractString) = a
joinpath(a::AbstractString, b::AbstractString, c::AbstractString...) = joinpath(joinpath(a,b), c...)
function joinpath(a::String, b::String)
isabspath(b) && return b
A, a = splitdrive(a)
B, b = splitdrive(b)
!isempty(B) && A != B && throw(ArgumentError("drive mismatch: $A$a $B$b"))
C = isempty(B) ? A : B
isempty(a) ? string(C,b) :
ismatch(path_separator_re, a[end:end]) ? string(C,a,b) :
string(C,a,pathsep(a,b),b)
end
joinpath(a::AbstractString, b::AbstractString) = joinpath(String(a), String(b))
function normpath(path::String)
isabs = isabspath(path)
isdir = isdirpath(path)
drive, path = splitdrive(path)
parts = split(path, path_separator_re)
filter!(x->!isempty(x) && x!=".", parts)
while true
clean = true
for j = 1:length(parts)-1
if parts[j] != ".." && parts[j+1] == ".."
deleteat!(parts, j:j+1)
clean = false
break
end
end
clean && break
end
if isabs
while !isempty(parts) && parts[1] == ".."
shift!(parts)
end
elseif isempty(parts)
push!(parts, ".")
end
path = join(parts, path_separator)
if isabs
path = path_separator*path
end
if isdir && !isdirpath(path)
path *= path_separator
end
string(drive,path)
end
normpath(a::AbstractString, b::AbstractString...) = normpath(joinpath(a,b...))
abspath(a::String) = normpath(isabspath(a) ? a : joinpath(pwd(),a))
abspath(a::AbstractString, b::AbstractString...) = abspath(joinpath(a,b...))
if is_windows()
function realpath(path::AbstractString)
p = cwstring(path)
buf = zeros(UInt16, length(p))
while true
n = ccall((:GetFullPathNameW, "kernel32"), stdcall,
UInt32, (Ptr{UInt16}, UInt32, Ptr{UInt16}, Ptr{Void}),
p, length(buf), buf, C_NULL)
systemerror(:realpath, n == 0)
x = n < length(buf) # is the buffer big enough?
resize!(buf, n) # shrink if x, grow if !x
x && return transcode(String, buf)
end
end
function longpath(path::AbstractString)
p = cwstring(path)
buf = zeros(UInt16, length(p))
while true
n = ccall((:GetLongPathNameW, "kernel32"), stdcall,
UInt32, (Ptr{UInt16}, Ptr{UInt16}, UInt32),
p, buf, length(buf))
systemerror(:longpath, n == 0)
x = n < length(buf) # is the buffer big enough?
resize!(buf, n) # shrink if x, grow if !x
x && return transcode(String, buf)
end
end
else # !windows
function realpath(path::AbstractString)
p = ccall(:realpath, Ptr{UInt8}, (Cstring, Ptr{UInt8}), path, C_NULL)
systemerror(:realpath, p == C_NULL)
return unsafe_wrap(String, p, true)
end
end # os-test
if is_windows()
expanduser(path::AbstractString) = path # on windows, ~ means "temporary file"
else
function expanduser(path::AbstractString)
i = start(path)
c, i = next(path,i)
if c != '~' return path end
if done(path,i) return homedir() end
c, j = next(path,i)
if c == '/' return homedir()*path[i:end] end
throw(ArgumentError("~user tilde expansion not yet implemented"))
end
end
function relpath(path::String, startpath::String = ".")
isempty(path) && throw(ArgumentError("`path` must be specified"))
isempty(startpath) && throw(ArgumentError("`startpath` must be specified"))
curdir = "."
pardir = ".."
path == startpath && return curdir
path_arr = split(abspath(path), path_separator_re)
start_arr = split(abspath(startpath), path_separator_re)
i = 0
while i < min(length(path_arr), length(start_arr))
i += 1
if path_arr[i] != start_arr[i]
i -= 1
break
end
end
pathpart = join(path_arr[i+1:findlast(x -> !isempty(x), path_arr)], path_separator)
prefix_num = findlast(x -> !isempty(x), start_arr) - i - 1
if prefix_num >= 0
prefix = pardir * path_separator
relpath_ = isempty(pathpart) ?
(prefix^prefix_num) * pardir :
(prefix^prefix_num) * pardir * path_separator * pathpart
else
relpath_ = pathpart
end
return isempty(relpath_) ? curdir : relpath_
end
relpath(path::AbstractString, startpath::AbstractString) =
relpath(String(path), String(startpath))
for f in (:isabspath, :isdirpath, :splitdir, :splitdrive, :splitext, :normpath, :abspath)
@eval $f(path::AbstractString) = $f(String(path))
end