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1 | require 'yaml'
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2 | require 'dbm'
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3 | #
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4 | # YAML + DBM = YDBM
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5 | # - Same interface as DBM class
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6 | #
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7 | module YAML
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8 |
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9 | class DBM < ::DBM
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10 | VERSION = "0.1"
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11 | def []( key )
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12 | fetch( key )
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13 | end
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14 | def []=( key, val )
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15 | store( key, val )
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16 | end
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17 | def fetch( keystr, ifnone = nil )
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18 | begin
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19 | val = super( keystr )
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20 | return YAML::load( val ) if String === val
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21 | rescue IndexError
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22 | end
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23 | if block_given?
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24 | yield keystr
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25 | else
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26 | ifnone
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27 | end
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28 | end
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29 | def index( keystr )
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30 | super( keystr.to_yaml )
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31 | end
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32 | def values_at( *keys )
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33 | keys.collect { |k| fetch( k ) }
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34 | end
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35 | def delete( key )
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36 | v = super( key )
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37 | if String === v
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38 | v = YAML::load( v )
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39 | end
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40 | v
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41 | end
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42 | def delete_if
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43 | del_keys = keys.dup
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44 | del_keys.delete_if { |k| yield( k, fetch( k ) ) == false }
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45 | del_keys.each { |k| delete( k ) }
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46 | self
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47 | end
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48 | def reject
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49 | hsh = self.to_hash
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50 | hsh.reject { |k,v| yield k, v }
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51 | end
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52 | def each_pair
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53 | keys.each { |k| yield k, fetch( k ) }
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54 | self
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55 | end
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56 | def each_value
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57 | super { |v| yield YAML::load( v ) }
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58 | self
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59 | end
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60 | def values
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61 | super.collect { |v| YAML::load( v ) }
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62 | end
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63 | def has_value?( val )
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64 | each_value { |v| return true if v == val }
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65 | return false
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66 | end
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67 | def invert
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68 | h = {}
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69 | keys.each { |k| h[ self.fetch( k ) ] = k }
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70 | h
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71 | end
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72 | def replace( hsh )
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73 | clear
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74 | update( hsh )
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75 | end
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76 | def shift
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77 | a = super
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78 | a[1] = YAML::load( a[1] ) if a
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79 | a
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80 | end
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81 | def select( *keys )
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82 | if block_given?
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83 | self.keys.collect { |k| v = self[k]; [k, v] if yield k, v }.compact
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84 | else
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85 | values_at( *keys )
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86 | end
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87 | end
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88 | def store( key, val )
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89 | super( key, val.to_yaml )
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90 | val
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91 | end
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92 | def update( hsh )
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93 | hsh.keys.each do |k|
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94 | self.store( k, hsh.fetch( k ) )
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95 | end
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96 | self
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97 | end
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98 | def to_a
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99 | a = []
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100 | keys.each { |k| a.push [ k, self.fetch( k ) ] }
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101 | a
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102 | end
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103 | def to_hash
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104 | h = {}
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105 | keys.each { |k| h[ k ] = self.fetch( k ) }
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106 | h
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107 | end
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108 | alias :each :each_pair
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109 | end
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110 |
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111 | end
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