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1 | #
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2 | # shell/filter.rb -
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3 | # $Release Version: 0.6.0 $
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4 | # $Revision: 11708 $
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5 | # $Date: 2007-02-13 08:01:19 +0900 (Tue, 13 Feb 2007) $
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6 | # by Keiju ISHITSUKA(Nihon Rational Software Co.,Ltd)
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7 | #
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8 | # --
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9 | #
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10 | #
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11 | #
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12 |
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13 | class Shell
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14 | #
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15 | # Filter
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16 | # A method to require
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17 | # each()
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18 | #
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19 | class Filter
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20 | include Enumerable
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21 |
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22 | def initialize(sh)
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23 | @shell = sh # parent shell
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24 | @input = nil # input filter
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25 | end
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26 |
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27 | attr_reader :input
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28 |
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29 | def input=(filter)
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30 | @input = filter
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31 | end
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32 |
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33 | def each(rs = nil)
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34 | rs = @shell.record_separator unless rs
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35 | if @input
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36 | @input.each(rs){|l| yield l}
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37 | end
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38 | end
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39 |
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40 | def < (src)
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41 | case src
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42 | when String
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43 | cat = Cat.new(@shell, src)
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44 | cat | self
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45 | when IO
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46 | self.input = src
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47 | self
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48 | else
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49 | Shell.Fail Error::CantApplyMethod, "<", to.class
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50 | end
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51 | end
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52 |
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53 | def > (to)
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54 | case to
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55 | when String
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56 | dst = @shell.open(to, "w")
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57 | begin
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58 | each(){|l| dst << l}
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59 | ensure
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60 | dst.close
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61 | end
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62 | when IO
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63 | each(){|l| to << l}
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64 | else
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65 | Shell.Fail Error::CantApplyMethod, ">", to.class
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66 | end
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67 | self
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68 | end
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69 |
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70 | def >> (to)
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71 | begin
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72 | Shell.cd(@shell.pwd).append(to, self)
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73 | rescue CantApplyMethod
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74 | Shell.Fail Error::CantApplyMethod, ">>", to.class
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75 | end
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76 | end
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77 |
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78 | def | (filter)
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79 | filter.input = self
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80 | if active?
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81 | @shell.process_controller.start_job filter
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82 | end
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83 | filter
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84 | end
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85 |
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86 | def + (filter)
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87 | Join.new(@shell, self, filter)
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88 | end
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89 |
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90 | def to_a
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91 | ary = []
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92 | each(){|l| ary.push l}
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93 | ary
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94 | end
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95 |
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96 | def to_s
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97 | str = ""
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98 | each(){|l| str.concat l}
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99 | str
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100 | end
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101 |
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102 | def inspect
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103 | if @shell.debug.kind_of?(Integer) && @shell.debug > 2
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104 | super
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105 | else
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106 | to_s
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107 | end
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108 | end
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109 | end
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110 | end
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