Current File : //opt/alt/ruby21/lib64/ruby/2.1.0/shell/filter.rb
#
# shell/filter.rb -
# $Release Version: 0.7 $
# $Revision: 44221 $
# by Keiju ISHITSUKA(keiju@ruby-lang.org)
#
# --
#
#
#
class Shell #:nodoc:
# Any result of command execution is a Filter.
#
# This class includes Enumerable, therefore a Filter object can use all
# Enumerable
# facilities.
#
class Filter
include Enumerable
def initialize(sh)
@shell = sh # parent shell
@input = nil # input filter
end
attr_reader :input
def input=(filter)
@input = filter
end
# call-seq:
# each(record_separator=nil) { block }
#
# Iterates a block for each line.
def each(rs = nil)
rs = @shell.record_separator unless rs
if @input
@input.each(rs){|l| yield l}
end
end
# call-seq:
# < source
#
# Inputs from +source+, which is either a string of a file name or an IO
# object.
def < (src)
case src
when String
cat = Cat.new(@shell, src)
cat | self
when IO
self.input = src
self
else
Shell.Fail Error::CantApplyMethod, "<", to.class
end
end
# call-seq:
# > source
#
# Outputs from +source+, which is either a string of a file name or an IO
# object.
def > (to)
case to
when String
dst = @shell.open(to, "w")
begin
each(){|l| dst << l}
ensure
dst.close
end
when IO
each(){|l| to << l}
else
Shell.Fail Error::CantApplyMethod, ">", to.class
end
self
end
# call-seq:
# >> source
#
# Appends the output to +source+, which is either a string of a file name
# or an IO object.
def >> (to)
begin
Shell.cd(@shell.pwd).append(to, self)
rescue CantApplyMethod
Shell.Fail Error::CantApplyMethod, ">>", to.class
end
end
# call-seq:
# | filter
#
# Processes a pipeline.
def | (filter)
filter.input = self
if active?
@shell.process_controller.start_job filter
end
filter
end
# call-seq:
# filter1 + filter2
#
# Outputs +filter1+, and then +filter2+ using Join.new
def + (filter)
Join.new(@shell, self, filter)
end
def to_a
ary = []
each(){|l| ary.push l}
ary
end
def to_s
str = ""
each(){|l| str.concat l}
str
end
def inspect
if @shell.debug.kind_of?(Integer) && @shell.debug > 2
super
else
to_s
end
end
end
end
Mini Shell