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# frozen_string_literal: false # # shell/filter.rb - # $Release Version: 0.7 $ # $Revision: 56937 $ # 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
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