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ruby--ruby/lib/pathname.rb
akr 3e67076db0 lib/pathname.rb (Pathname#+): re-implemented to resolve ".." in
beginning of the argument.
(Pathname#join): concatenate from the last argument.
(Pathname#parent): just use Pathname#+.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@5235 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2003-12-21 07:28:59 +00:00

784 lines
24 KiB
Ruby

# Object-Oriented Pathname Class
#
# Author:: Tanaka Akira <akr@m17n.org>
# Pathname represents a pathname which locates a file in a filesystem.
# It supports only Unix style pathnames.
#
# Pathname is immutable. It has no method for destructive update.
#
# pathname.rb is distributed with Ruby since 1.8.0.
class Pathname
def initialize(path)
@path = path.to_str.dup
@path.freeze
if /\0/ =~ @path
raise ArgumentError, "pathname contains \\0: #{@path.inspect}"
end
end
def ==(other)
return false unless Pathname === other
other.to_s == @path
end
alias === ==
alias eql? ==
def <=>(other)
return nil unless Pathname === other
@path.tr('/', "\0") <=> other.to_s.tr('/', "\0")
end
def hash
@path.hash
end
def to_s
@path.dup
end
# to_str is implemented for Pathname object usable with File.open, etc.
alias to_str to_s
def inspect
"#<#{self.class}:#{@path}>"
end
# cleanpath returns clean pathname of self which is without consecutive
# slashes and useless dots.
#
# If true is given as the optional argument consider_symlink,
# symbolic links are considered. It makes more dots are retained.
#
# cleanpath doesn't access actual filesystem.
def cleanpath(consider_symlink=false)
if consider_symlink
cleanpath_conservative
else
cleanpath_aggressive
end
end
def cleanpath_aggressive # :nodoc:
# cleanpath_aggressive assumes:
# * no symlink
# * all pathname prefix contained in the pathname is existing directory
return Pathname.new('') if @path == ''
absolute = absolute?
names = []
@path.scan(%r{[^/]+}) {|name|
next if name == '.'
if name == '..'
if names.empty?
next if absolute
else
if names.last != '..'
names.pop
next
end
end
end
names << name
}
return Pathname.new(absolute ? '/' : '.') if names.empty?
path = absolute ? '/' : ''
path << names.join('/')
Pathname.new(path)
end
def cleanpath_conservative # :nodoc:
return Pathname.new('') if @path == ''
names = @path.scan(%r{[^/]+})
last_dot = names.last == '.'
names.delete('.')
names.shift while names.first == '..' if absolute?
return Pathname.new(absolute? ? '/' : '.') if names.empty?
path = absolute? ? '/' : ''
path << names.join('/')
if names.last != '..'
if last_dot
path << '/.'
elsif %r{/\z} =~ @path
path << '/'
end
end
Pathname.new(path)
end
# realpath returns a real pathname of self in actual filesystem.
# The real pathname doesn't contain a symlink and useless dots.
#
# It returns absolute pathname.
def realpath(*args)
unless args.empty?
warn "The argument for Pathname#realpath is obsoleted."
end
force_absolute = args.fetch(0, true)
if %r{\A/} =~ @path
top = '/'
unresolved = @path.scan(%r{[^/]+})
elsif force_absolute
# Although POSIX getcwd returns a pathname which contains no symlink,
# 4.4BSD-Lite2 derived getcwd may return the environment variable $PWD
# which may contain a symlink.
# So the return value of Dir.pwd should be examined.
top = '/'
unresolved = Dir.pwd.scan(%r{[^/]+}) + @path.scan(%r{[^/]+})
else
top = ''
unresolved = @path.scan(%r{[^/]+})
end
resolved = []
until unresolved.empty?
case unresolved.last
when '.'
unresolved.pop
when '..'
resolved.unshift unresolved.pop
else
loop_check = {}
while (stat = File.lstat(path = top + unresolved.join('/'))).symlink?
symlink_id = "#{stat.dev}:#{stat.ino}"
raise Errno::ELOOP.new(path) if loop_check[symlink_id]
loop_check[symlink_id] = true
if %r{\A/} =~ (link = File.readlink(path))
top = '/'
unresolved = link.scan(%r{[^/]+})
else
unresolved[-1,1] = link.scan(%r{[^/]+})
end
end
next if (filename = unresolved.pop) == '.'
if filename != '..' && resolved.first == '..'
resolved.shift
else
resolved.unshift filename
end
end
end
if top == '/'
resolved.shift while resolved[0] == '..'
end
if resolved.empty?
Pathname.new(top.empty? ? '.' : '/')
else
Pathname.new(top + resolved.join('/'))
end
end
# parent method returns parent directory.
#
# This is same as self + '..'.
def parent
self + '..'
end
# mountpoint? method returns true if self points a mountpoint.
def mountpoint?
begin
stat1 = self.lstat
stat2 = self.parent.lstat
stat1.dev == stat2.dev && stat1.ino == stat2.ino ||
stat1.dev != stat2.dev
rescue Errno::ENOENT
false
end
end
# root? method is a predicate for root directory.
# I.e. it returns true if the pathname consists of consecutive slashes.
#
# It doesn't access actual filesystem.
# So it may return false for some pathnames
# which points root such as "/usr/..".
def root?
%r{\A/+\z} =~ @path ? true : false
end
# absolute? method is a predicate for absolute pathname.
# It returns true if self is beginning with a slash.
def absolute?
%r{\A/} =~ @path ? true : false
end
# relative? method is a predicate for relative pathname.
# It returns true unless self is beginning with a slash.
def relative?
!absolute?
end
# each_filename iterates over self for each filename components.
def each_filename
@path.scan(%r{[^/]+}) { yield $& }
end
# Pathname#+ concatenates self and an argument.
# I.e. a result is basically same as the argument but the base directory
# is changed to self if the argument is relative.
#
# Pathname#+ doesn't access actual filesystem.
def +(other)
other = Pathname.new(other) unless Pathname === other
return other if other.absolute?
path1 = @path
path2 = other.to_s
while m2 = %r{\A\.\.(?:/+|\z)}.match(path2) and
m1 = %r{(\A|/+)([^/]+)\z}.match(path1) and
%r{\A(?:\.|\.\.)\z} !~ m1[2]
path1 = m1[1].empty? ? '.' : '/' if (path1 = m1.pre_match).empty?
path2 = '.' if (path2 = m2.post_match).empty?
end
if %r{\A/+\z} =~ path1
while m2 = %r{\A\.\.(?:/+|\z)}.match(path2)
path2 = '.' if (path2 = m2.post_match).empty?
end
end
return Pathname.new(path2) if path1 == '.'
return Pathname.new(path1) if path2 == '.'
if %r{/\z} =~ path1
Pathname.new(path1 + path2)
else
Pathname.new(path1 + '/' + path2)
end
end
# Pathname#join joins pathnames.
#
# path0.join(path1, ... pathN) is same as path0 + path1 + ... + pathN.
def join(*args)
args.unshift self
result = args.pop
result = Pathname.new(result) unless Pathname === result
return result if result.absolute?
args.reverse_each {|arg|
arg = Pathname.new(arg) unless Pathname === arg
result = arg + result
return result if result.absolute?
}
result
end
# Pathname#children returns the children of the directory as an array of
# pathnames.
#
# By default, the returned pathname can be used to access the corresponding
# file in the directory.
# This is because the pathname contains self as a prefix unless self is `.'.
#
# If false is given for the optional argument `with_directory',
# just filenames of children is returned.
# In this case, the returned pathname cannot be used directly to access the
# corresponding file when self doesn't point working directory.
#
# Note that the result never contain the entry `.' and `..' in the directory
# because they are not child.
#
# This method is exist since 1.8.1.
def children(with_directory=true)
with_directory = false if @path == '.'
result = []
Dir.foreach(@path) {|e|
next if e == '.' || e == '..'
if with_directory
result << Pathname.new(File.join(@path, e))
else
result << Pathname.new(e)
end
}
result
end
# Pathname#relative_path_from returns a relative path from the argument to
# self.
# If self is absolute, the argument must be absolute too.
# If self is relative, the argument must be relative too.
#
# relative_path_from doesn't access actual filesystem.
# It assumes no symlinks.
#
# ArgumentError is raised when it cannot find a relative path.
#
# This method is exist since 1.8.1.
def relative_path_from(base_directory)
if self.absolute? != base_directory.absolute?
raise ArgumentError,
"relative path between absolute and relative path: #{self.inspect}, #{base_directory.inspect}"
end
dest = []
self.cleanpath.each_filename {|f|
next if f == '.'
dest << f
}
base = []
base_directory.cleanpath.each_filename {|f|
next if f == '.'
base << f
}
while !base.empty? && !dest.empty? && base[0] == dest[0]
base.shift
dest.shift
end
if base.include? '..'
raise ArgumentError, "base_directory has ..: #{base_directory.inspect}"
end
base.fill '..'
relpath = base + dest
if relpath.empty?
Pathname.new(".")
else
Pathname.new(relpath.join('/'))
end
end
end
# IO
class Pathname
# Pathname#each_line iterates over lines of the file.
# It's yields a String object for each line.
#
# This method is exist since 1.8.1.
def each_line(*args, &block) IO.foreach(@path, *args, &block) end
# Pathname#foreachline is obsoleted at 1.8.1.
#
def foreachline(*args, &block) # compatibility to 1.8.0. obsoleted.
warn "Pathname#foreachline is obsoleted. Use Pathname#each_line."
each_line(*args, &block)
end
def read(*args) IO.read(@path, *args) end
def readlines(*args) IO.readlines(@path, *args) end
def sysopen(*args) IO.sysopen(@path, *args) end
end
# File
class Pathname
def atime() File.atime(@path) end
def ctime() File.ctime(@path) end
def mtime() File.mtime(@path) end
def chmod(mode) File.chmod(mode, @path) end
def lchmod(mode) File.chmod(mode, @path) end
def chown(owner, group) File.chown(owner, group, @path) end
def lchown(owner, group) File.lchown(owner, group, @path) end
def fnmatch(pattern, *args) File.fnmatch(pattern, @path, *args) end
def fnmatch?(pattern, *args) File.fnmatch?(pattern, @path, *args) end
def ftype() File.ftype(@path) end
def make_link(old) File.link(old, @path) end
def open(*args, &block) File.open(@path, *args, &block) end
def readlink() Pathname.new(File.readlink(@path)) end
def rename(to) File.rename(@path, to) end
def stat() File.stat(@path) end
def lstat() File.lstat(@path) end
def make_symlink(old) File.symlink(old, @path) end
def truncate(length) File.truncate(@path, length) end
def utime(atime, mtime) File.utime(atime, mtime, @path) end
def basename(*args) Pathname.new(File.basename(@path, *args)) end
def dirname() Pathname.new(File.dirname(@path)) end
def extname() File.extname(@path) end
def expand_path(*args) Pathname.new(File.expand_path(@path, *args)) end
def split() File.split(@path).map {|f| Pathname.new(f) } end
# Pathname#link is confusing and obsoleted because the receiver/argument
# order is inverted to corresponding system call.
def link(old)
warn 'Pathname#link is obsoleted. Use Pathname#make_link.'
File.link(old, @path)
end
# Pathname#symlink is confusing and obsoleted because the receiver/argument
# order is inverted to corresponding system call.
def symlink(old)
warn 'Pathname#symlink is obsoleted. Use Pathname#make_symlink.'
File.symlink(old, @path)
end
end
# FileTest
class Pathname
def blockdev?() FileTest.blockdev?(@path) end
def chardev?() FileTest.chardev?(@path) end
def executable?() FileTest.executable?(@path) end
def executable_real?() FileTest.executable_real?(@path) end
def exist?() FileTest.exist?(@path) end
def grpowned?() FileTest.grpowned?(@path) end
def directory?() FileTest.directory?(@path) end
def file?() FileTest.file?(@path) end
def pipe?() FileTest.pipe?(@path) end
def socket?() FileTest.socket?(@path) end
def owned?() FileTest.owned?(@path) end
def readable?() FileTest.readable?(@path) end
def readable_real?() FileTest.readable_real?(@path) end
def setuid?() FileTest.setuid?(@path) end
def setgid?() FileTest.setgid?(@path) end
def size() FileTest.size(@path) end
def size?() FileTest.size?(@path) end
def sticky?() FileTest.sticky?(@path) end
def symlink?() FileTest.symlink?(@path) end
def writable?() FileTest.writable?(@path) end
def writable_real?() FileTest.writable_real?(@path) end
def zero?() FileTest.zero?(@path) end
end
# Dir
class Pathname
def Pathname.glob(*args)
if block_given?
Dir.glob(*args) {|f| yield Pathname.new(f) }
else
Dir.glob(*args).map {|f| Pathname.new(f) }
end
end
def Pathname.getwd() Pathname.new(Dir.getwd) end
class << self; alias pwd getwd end
# Pathname#chdir is obsoleted at 1.8.1.
#
def chdir(&block) # compatibility to 1.8.0.
warn "Pathname#chdir is obsoleted. Use Dir.chdir."
Dir.chdir(@path, &block)
end
# Pathname#chroot is obsoleted at 1.8.1.
#
def chroot # compatibility to 1.8.0.
warn "Pathname#chroot is obsoleted. Use Dir.chroot."
Dir.chroot(@path)
end
def rmdir() Dir.rmdir(@path) end
def entries() Dir.entries(@path).map {|f| Pathname.new(f) } end
# Pathname#each_entry iterates over entries of the directory.
# It's yields Pathname objects for each entry.
#
# This method is exist since 1.8.1.
def each_entry(&block) Dir.foreach(@path) {|f| yield Pathname.new(f) } end
# Pathname#dir_foreach is obsoleted at 1.8.1.
#
def dir_foreach(*args, &block) # compatibility to 1.8.0. obsoleted.
warn "Pathname#dir_foreach is obsoleted. Use Pathname#each_entry."
each_entry(*args, &block)
end
def mkdir(*args) Dir.mkdir(@path, *args) end
def opendir(&block) Dir.open(@path, &block) end
end
# Find
class Pathname
# Pathname#find is a iterator to traverse directory tree in depth first
# manner. It yields a pathname for each file under the directory which
# is pointed by self.
#
# Since it is implemented by find.rb, Find.prune can be used to control the
# traverse.
#
# If self is `.', yielded pathnames begin with a filename in the current
# directory, not `./'.
def find(&block)
require 'find'
if @path == '.'
Find.find(@path) {|f| yield Pathname.new(f.sub(%r{\A\./}, '')) }
else
Find.find(@path) {|f| yield Pathname.new(f) }
end
end
end
# FileUtils
class Pathname
def mkpath
require 'fileutils'
FileUtils.mkpath(@path)
nil
end
def rmtree
# The name "rmtree" is borrowed from File::Path of Perl.
# File::Path provides "mkpath" and "rmtree".
require 'fileutils'
FileUtils.rm_r(@path)
nil
end
end
# mixed
class Pathname
def unlink()
if FileTest.directory? @path
Dir.unlink @path
else
File.unlink @path
end
end
alias delete unlink
# This method is obsoleted at 1.8.1.
#
def foreach(*args, &block) # compatibility to 1.8.0. obsoleted.
warn "Pathname#foreach is obsoleted. Use each_line or each_entry."
if FileTest.directory? @path
# For polymorphism between Dir.foreach and IO.foreach,
# Pathname#foreach doesn't yield Pathname object.
Dir.foreach(@path, *args, &block)
else
IO.foreach(@path, *args, &block)
end
end
end
if $0 == __FILE__
require 'test/unit'
class PathnameTest < Test::Unit::TestCase # :nodoc:
class AnotherStringLike # :nodoc:
def initialize(s) @s = s end
def to_str() @s end
def ==(other) @s == other end
end
def test_equality
obj = Pathname.new("a")
str = "a"
sym = :a
ano = AnotherStringLike.new("a")
assert_equal(false, obj == str)
assert_equal(false, str == obj)
assert_equal(false, obj == ano)
assert_equal(false, ano == obj)
assert_equal(false, obj == sym)
assert_equal(false, sym == obj)
obj2 = Pathname.new("a")
assert_equal(true, obj == obj2)
assert_equal(true, obj === obj2)
assert_equal(true, obj.eql?(obj2))
end
def test_hashkey
h = {}
h[Pathname.new("a")] = 1
h[Pathname.new("a")] = 2
assert_equal(1, h.size)
end
def assert_pathname_cmp(e, s1, s2)
p1 = Pathname.new(s1)
p2 = Pathname.new(s2)
r = p1 <=> p2
assert(e == r,
"#{p1.inspect} <=> #{p2.inspect}: <#{e}> expected but was <#{r}>")
end
def test_comparison
assert_pathname_cmp( 0, "a", "a")
assert_pathname_cmp( 1, "b", "a")
assert_pathname_cmp(-1, "a", "b")
ss = %w(
a
a/
a/b
a.
a0
)
s1 = ss.shift
ss.each {|s2|
assert_pathname_cmp(-1, s1, s2)
s1 = s2
}
end
def test_comparison_string
assert_equal(nil, Pathname.new("a") <=> "a")
assert_equal(nil, "a" <=> Pathname.new("a"))
end
def test_syntactical
assert_equal(true, Pathname.new("/").root?)
assert_equal(true, Pathname.new("//").root?)
assert_equal(true, Pathname.new("///").root?)
assert_equal(false, Pathname.new("").root?)
assert_equal(false, Pathname.new("a").root?)
end
def test_cleanpath
assert_equal('/', Pathname.new('/').cleanpath(true).to_s)
assert_equal('/', Pathname.new('//').cleanpath(true).to_s)
assert_equal('', Pathname.new('').cleanpath(true).to_s)
assert_equal('.', Pathname.new('.').cleanpath(true).to_s)
assert_equal('..', Pathname.new('..').cleanpath(true).to_s)
assert_equal('a', Pathname.new('a').cleanpath(true).to_s)
assert_equal('/', Pathname.new('/.').cleanpath(true).to_s)
assert_equal('/', Pathname.new('/..').cleanpath(true).to_s)
assert_equal('/a', Pathname.new('/a').cleanpath(true).to_s)
assert_equal('.', Pathname.new('./').cleanpath(true).to_s)
assert_equal('..', Pathname.new('../').cleanpath(true).to_s)
assert_equal('a/', Pathname.new('a/').cleanpath(true).to_s)
assert_equal('a/b', Pathname.new('a//b').cleanpath(true).to_s)
assert_equal('a/.', Pathname.new('a/.').cleanpath(true).to_s)
assert_equal('a/.', Pathname.new('a/./').cleanpath(true).to_s)
assert_equal('a/..', Pathname.new('a/../').cleanpath(true).to_s)
assert_equal('/a/.', Pathname.new('/a/.').cleanpath(true).to_s)
assert_equal('..', Pathname.new('./..').cleanpath(true).to_s)
assert_equal('..', Pathname.new('../.').cleanpath(true).to_s)
assert_equal('..', Pathname.new('./../').cleanpath(true).to_s)
assert_equal('..', Pathname.new('.././').cleanpath(true).to_s)
assert_equal('/', Pathname.new('/./..').cleanpath(true).to_s)
assert_equal('/', Pathname.new('/../.').cleanpath(true).to_s)
assert_equal('/', Pathname.new('/./../').cleanpath(true).to_s)
assert_equal('/', Pathname.new('/.././').cleanpath(true).to_s)
assert_equal('a/b/c', Pathname.new('a/b/c').cleanpath(true).to_s)
assert_equal('b/c', Pathname.new('./b/c').cleanpath(true).to_s)
assert_equal('a/c', Pathname.new('a/./c').cleanpath(true).to_s)
assert_equal('a/b/.', Pathname.new('a/b/.').cleanpath(true).to_s)
assert_equal('a/..', Pathname.new('a/../.').cleanpath(true).to_s)
assert_equal('/a', Pathname.new('/../.././../a').cleanpath(true).to_s)
assert_equal('a/b/../../../../c/../d',
Pathname.new('a/b/../../../../c/../d').cleanpath(true).to_s)
end
def test_cleanpath_no_symlink
assert_equal('/', Pathname.new('/').cleanpath.to_s)
assert_equal('/', Pathname.new('//').cleanpath.to_s)
assert_equal('', Pathname.new('').cleanpath.to_s)
assert_equal('.', Pathname.new('.').cleanpath.to_s)
assert_equal('..', Pathname.new('..').cleanpath.to_s)
assert_equal('a', Pathname.new('a').cleanpath.to_s)
assert_equal('/', Pathname.new('/.').cleanpath.to_s)
assert_equal('/', Pathname.new('/..').cleanpath.to_s)
assert_equal('/a', Pathname.new('/a').cleanpath.to_s)
assert_equal('.', Pathname.new('./').cleanpath.to_s)
assert_equal('..', Pathname.new('../').cleanpath.to_s)
assert_equal('a', Pathname.new('a/').cleanpath.to_s)
assert_equal('a/b', Pathname.new('a//b').cleanpath.to_s)
assert_equal('a', Pathname.new('a/.').cleanpath.to_s)
assert_equal('a', Pathname.new('a/./').cleanpath.to_s)
assert_equal('.', Pathname.new('a/../').cleanpath.to_s)
assert_equal('/a', Pathname.new('/a/.').cleanpath.to_s)
assert_equal('..', Pathname.new('./..').cleanpath.to_s)
assert_equal('..', Pathname.new('../.').cleanpath.to_s)
assert_equal('..', Pathname.new('./../').cleanpath.to_s)
assert_equal('..', Pathname.new('.././').cleanpath.to_s)
assert_equal('/', Pathname.new('/./..').cleanpath.to_s)
assert_equal('/', Pathname.new('/../.').cleanpath.to_s)
assert_equal('/', Pathname.new('/./../').cleanpath.to_s)
assert_equal('/', Pathname.new('/.././').cleanpath.to_s)
assert_equal('a/b/c', Pathname.new('a/b/c').cleanpath.to_s)
assert_equal('b/c', Pathname.new('./b/c').cleanpath.to_s)
assert_equal('a/c', Pathname.new('a/./c').cleanpath.to_s)
assert_equal('a/b', Pathname.new('a/b/.').cleanpath.to_s)
assert_equal('.', Pathname.new('a/../.').cleanpath.to_s)
assert_equal('/a', Pathname.new('/../.././../a').cleanpath.to_s)
assert_equal('../../d', Pathname.new('a/b/../../../../c/../d').cleanpath.to_s)
end
def test_destructive_update
path = Pathname.new("a")
path.to_s.replace "b"
assert_equal(Pathname.new("a"), path)
end
def test_null_character
assert_raises(ArgumentError) { Pathname.new("\0") }
end
def assert_relpath(result, dest, base)
assert_equal(Pathname.new(result),
Pathname.new(dest).relative_path_from(Pathname.new(base)))
end
def assert_relpath_err(dest, base)
assert_raises(ArgumentError) {
Pathname.new(dest).relative_path_from(Pathname.new(base))
}
end
def test_relative_path_from
assert_relpath("../a", "a", "b")
assert_relpath("../a", "a", "b/")
assert_relpath("../a", "a/", "b")
assert_relpath("../a", "a/", "b/")
assert_relpath("../a", "/a", "/b")
assert_relpath("../a", "/a", "/b/")
assert_relpath("../a", "/a/", "/b")
assert_relpath("../a", "/a/", "/b/")
assert_relpath("../b", "a/b", "a/c")
assert_relpath("../a", "../a", "../b")
assert_relpath("a", "a", ".")
assert_relpath("..", ".", "a")
assert_relpath(".", ".", ".")
assert_relpath(".", "..", "..")
assert_relpath("..", "..", ".")
assert_relpath("c/d", "/a/b/c/d", "/a/b")
assert_relpath("../..", "/a/b", "/a/b/c/d")
assert_relpath("../../../../e", "/e", "/a/b/c/d")
assert_relpath("../b/c", "a/b/c", "a/d")
assert_relpath("../a", "/../a", "/b")
assert_relpath("../../a", "../a", "b")
assert_relpath(".", "/a/../../b", "/b")
assert_relpath("..", "a/..", "a")
assert_relpath(".", "a/../b", "b")
assert_relpath("a", "a", "b/..")
assert_relpath("b/c", "b/c", "b/..")
assert_relpath_err("/", ".")
assert_relpath_err(".", "/")
assert_relpath_err("a", "..")
assert_relpath_err(".", "..")
end
def assert_pathname_plus(a, b, c)
a = Pathname.new(a)
b = Pathname.new(b)
c = Pathname.new(c)
d = b + c
assert(a == d,
"#{b.inspect} + #{c.inspect}: #{a.inspect} expected but was #{d.inspect}")
end
def test_plus
assert_pathname_plus('a/b', 'a', 'b')
assert_pathname_plus('a', 'a', '.')
assert_pathname_plus('b', '.', 'b')
assert_pathname_plus('.', '.', '.')
assert_pathname_plus('/b', 'a', '/b')
assert_pathname_plus('/', '/', '..')
assert_pathname_plus('.', 'a', '..')
assert_pathname_plus('a', 'a/b', '..')
assert_pathname_plus('/c', '/', '../c')
assert_pathname_plus('c', 'a', '../c')
assert_pathname_plus('a/c', 'a/b', '../c')
end
end
end