Converts a pathname to an absolute pathname. Relative paths are referenced from the current working directory of the process unless dir_string
is given, in which case it will be used as the starting point. The given pathname may start with a “~
”, which expands to the process owner’s home directory (the environment variable HOME
must be set correctly). “~
user” expands to the named user’s home directory.
File.expand_path("~oracle/bin") #=> "/home/oracle/bin"
A simple example of using dir_string
is as follows.
File.expand_path("ruby", "/usr/bin") #=> "/usr/bin/ruby"
A more complex example which also resolves parent directory is as follows. Suppose we are in bin/mygem and want the absolute path of lib/mygem.rb.
File.expand_path("../../lib/mygem.rb", __FILE__) #=> ".../path/to/project/lib/mygem.rb"
So first it resolves the parent of __FILE__, that is bin/, then go to the parent, the root of the project and appends lib/mygem.rb
.
Converts a pathname to an absolute pathname. Relative paths are referenced from the current working directory of the process unless dir_string is given, in which case it will be used as the starting point. If the given pathname starts with a “~
” it is NOT expanded, it is treated as a normal directory name.
File.absolute_path("~oracle/bin") #=> "<relative_path>/~oracle/bin"
Returns true
if file_name
is an absolute path, and false
otherwise.
File.absolute_path?("c:/foo") #=> false (on Linux), true (on Windows)
Returns whether ASCII-compatible or not.
Encoding::UTF_8.ascii_compatible? #=> true Encoding::UTF_16BE.ascii_compatible? #=> false
Returns the list of private methods accessible to obj. If the all parameter is set to false
, only those methods in the receiver will be listed.
Returns any backtrace associated with the exception. This method is similar to Exception#backtrace
, but the backtrace is an array of Thread::Backtrace::Location
.
This method is not affected by Exception#set_backtrace()
.
Return true if the caused method was called as private.
When this module is included in another, Ruby calls append_features
in this module, passing it the receiving module in mod. Ruby’s default implementation is to add the constants, methods, and module variables of this module to mod if this module has not already been added to mod or one of its ancestors. See also Module#include
.
When this module is prepended in another, Ruby calls prepend_features
in this module, passing it the receiving module in mod. Ruby’s default implementation is to overlay the constants, methods, and module variables of this module to mod if this module has not already been added to mod or one of its ancestors. See also Module#prepend
.
Creates instance variables and corresponding methods that return the value of each instance variable. Equivalent to calling “attr
:name” on each name in turn. String
arguments are converted to symbols. Returns an array of defined method names as symbols.
Creates an accessor method to allow assignment to the attribute symbol.id2name
. String
arguments are converted to symbols. Returns an array of defined method names as symbols.
Defines a named attribute for this module, where the name is symbol.id2name
, creating an instance variable (@name
) and a corresponding access method to read it. Also creates a method called name=
to set the attribute. String
arguments are converted to symbols. Returns an array of defined method names as symbols.
module Mod attr_accessor(:one, :two) #=> [:one, :one=, :two, :two=] end Mod.instance_methods.sort #=> [:one, :one=, :two, :two=]
Makes a list of existing constants private.
Makes a list of existing constants deprecated. Attempt to refer to them will produce a warning.
module HTTP NotFound = Exception.new NOT_FOUND = NotFound # previous version of the library used this name deprecate_constant :NOT_FOUND end HTTP::NOT_FOUND # warning: constant HTTP::NOT_FOUND is deprecated
Return the accept character set for all new CGI
instances.
Returns true
if the arguments define a valid ordinal date, false
otherwise:
Date.valid_date?(2001, 2, 3) # => true Date.valid_date?(2001, 2, 29) # => false Date.valid_date?(2001, 2, -1) # => true
See argument start.
Returns self
.
Returns a DateTime
whose value is the same as self
:
Date.new(2001, 2, 3).to_datetime # => #<DateTime: 2001-02-03T00:00:00+00:00>
See as_json
.
Returns a Date
object which denotes self.
Returns self.
Returns a Date
object which denotes self.