1 | require 'forwardable'
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2 |
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3 | require 'rss/rss'
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4 |
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5 | module RSS
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6 | module Maker
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7 |
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8 | module Base
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9 |
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10 | def self.append_features(klass)
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11 | super
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12 |
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13 | klass.module_eval(<<-EOC, __FILE__, __LINE__)
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14 |
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15 | OTHER_ELEMENTS = []
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16 | NEED_INITIALIZE_VARIABLES = []
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17 |
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18 | def self.inherited(subclass)
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19 | subclass.const_set("OTHER_ELEMENTS", [])
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20 | subclass.const_set("NEED_INITIALIZE_VARIABLES", [])
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21 |
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22 | subclass.module_eval(<<-EOEOC, __FILE__, __LINE__)
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23 | def self.other_elements
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24 | OTHER_ELEMENTS + super
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25 | end
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26 |
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27 | def self.need_initialize_variables
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28 | NEED_INITIALIZE_VARIABLES + super
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29 | end
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30 | EOEOC
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31 | end
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32 |
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33 | def self.add_other_element(variable_name)
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34 | OTHER_ELEMENTS << variable_name
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35 | end
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36 |
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37 | def self.other_elements
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38 | OTHER_ELEMENTS
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39 | end
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40 |
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41 | def self.add_need_initialize_variable(variable_name, init_value="nil")
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42 | NEED_INITIALIZE_VARIABLES << [variable_name, init_value]
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43 | end
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44 |
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45 | def self.need_initialize_variables
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46 | NEED_INITIALIZE_VARIABLES
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47 | end
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48 |
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49 | def self.def_array_element(name)
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50 | include Enumerable
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51 | extend Forwardable
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52 |
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53 | def_delegators("@\#{name}", :<<, :[], :[]=, :first, :last)
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54 | def_delegators("@\#{name}", :push, :pop, :shift, :unshift)
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55 | def_delegators("@\#{name}", :each, :size)
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56 |
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57 | add_need_initialize_variable(name, "[]")
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58 | end
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59 | EOC
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60 | end
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61 |
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62 | def initialize(maker)
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63 | @maker = maker
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64 | initialize_variables
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65 | end
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66 |
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67 | def have_required_values?
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68 | true
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69 | end
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70 |
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71 | private
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72 | def initialize_variables
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73 | self.class.need_initialize_variables.each do |variable_name, init_value|
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74 | instance_eval("@#{variable_name} = #{init_value}", __FILE__, __LINE__)
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75 | end
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76 | end
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77 |
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78 | def setup_other_elements(rss)
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79 | self.class.other_elements.each do |element|
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80 | __send__("setup_#{element}", rss, current_element(rss))
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81 | end
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82 | end
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83 |
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84 | def current_element(rss)
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85 | rss
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86 | end
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87 |
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88 | def setup_values(target)
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89 | set = false
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90 | if have_required_values?
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91 | variables.each do |var|
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92 | setter = "#{var}="
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93 | if target.respond_to?(setter)
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94 | value = __send__(var)
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95 | if value
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96 | target.__send__(setter, value)
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97 | set = true
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98 | end
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99 | end
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100 | end
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101 | end
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102 | set
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103 | end
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104 |
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105 | def variables
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106 | self.class.need_initialize_variables.find_all do |name, init|
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107 | "nil" == init
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108 | end.collect do |name, init|
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109 | name
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110 | end
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111 | end
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112 |
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113 | def variable_is_set?
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114 | variables.find {|var| !__send__(var).nil?}
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115 | end
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116 |
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117 | def not_set_required_variables
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118 | required_variable_names.find_all do |var|
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119 | __send__(var).nil?
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120 | end
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121 | end
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122 |
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123 | def required_variables_are_set?
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124 | required_variable_names.each do |var|
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125 | return false if __send__(var).nil?
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126 | end
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127 | true
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128 | end
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129 |
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130 | end
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131 |
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132 | class RSSBase
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133 | include Base
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134 |
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135 | class << self
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136 | def make(&block)
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137 | new.make(&block)
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138 | end
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139 | end
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140 |
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141 | %w(xml_stylesheets channel image items textinput).each do |element|
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142 | attr_reader element
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143 | add_need_initialize_variable(element, "make_#{element}")
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144 | module_eval(<<-EOC, __FILE__, __LINE__)
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145 | private
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146 | def setup_#{element}(rss)
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147 | @#{element}.to_rss(rss)
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148 | end
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149 |
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150 | def make_#{element}
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151 | self.class::#{Utils.to_class_name(element)}.new(self)
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152 | end
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153 | EOC
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154 | end
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155 |
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156 | attr_reader :rss_version
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157 | attr_accessor :version, :encoding, :standalone
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158 |
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159 | def initialize(rss_version)
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160 | super(self)
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161 | @rss_version = rss_version
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162 | @version = "1.0"
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163 | @encoding = "UTF-8"
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164 | @standalone = nil
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165 | end
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166 |
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167 | def make
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168 | if block_given?
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169 | yield(self)
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170 | to_rss
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171 | else
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172 | nil
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173 | end
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174 | end
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175 |
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176 | def to_rss
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177 | rss = make_rss
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178 | setup_xml_stylesheets(rss)
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179 | setup_elements(rss)
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180 | setup_other_elements(rss)
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181 | if rss.channel
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182 | rss
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183 | else
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184 | nil
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185 | end
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186 | end
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187 |
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188 | private
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189 | remove_method :make_xml_stylesheets
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190 | def make_xml_stylesheets
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191 | XMLStyleSheets.new(self)
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192 | end
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193 |
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194 | end
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195 |
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196 | class XMLStyleSheets
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197 | include Base
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198 |
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199 | def_array_element("xml_stylesheets")
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200 |
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201 | def to_rss(rss)
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202 | @xml_stylesheets.each do |xss|
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203 | xss.to_rss(rss)
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204 | end
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205 | end
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206 |
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207 | def new_xml_stylesheet
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208 | xss = XMLStyleSheet.new(@maker)
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209 | @xml_stylesheets << xss
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210 | if block_given?
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211 | yield xss
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212 | else
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213 | xss
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214 | end
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215 | end
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216 |
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217 | class XMLStyleSheet
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218 | include Base
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219 |
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220 | ::RSS::XMLStyleSheet::ATTRIBUTES.each do |attribute|
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221 | attr_accessor attribute
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222 | add_need_initialize_variable(attribute)
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223 | end
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224 |
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225 | def to_rss(rss)
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226 | xss = ::RSS::XMLStyleSheet.new
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227 | guess_type_if_need(xss)
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228 | set = setup_values(xss)
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229 | if set
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230 | rss.xml_stylesheets << xss
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231 | end
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232 | end
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233 |
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234 | def have_required_values?
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235 | @href and @type
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236 | end
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237 |
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238 | private
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239 | def guess_type_if_need(xss)
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240 | if @type.nil?
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241 | xss.href = @href
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242 | @type = xss.type
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243 | end
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244 | end
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245 | end
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246 | end
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247 |
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248 | class ChannelBase
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249 | include Base
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250 |
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251 | %w(cloud categories skipDays skipHours).each do |element|
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252 | attr_reader element
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253 | add_other_element(element)
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254 | add_need_initialize_variable(element, "make_#{element}")
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255 | module_eval(<<-EOC, __FILE__, __LINE__)
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256 | private
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257 | def setup_#{element}(rss, current)
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258 | @#{element}.to_rss(rss, current)
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259 | end
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260 |
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261 | def make_#{element}
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262 | self.class::#{Utils.to_class_name(element)}.new(@maker)
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263 | end
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264 | EOC
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265 | end
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266 |
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267 | %w(about title link description language copyright
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268 | managingEditor webMaster rating docs date
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269 | lastBuildDate generator ttl).each do |element|
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270 | attr_accessor element
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271 | add_need_initialize_variable(element)
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272 | end
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273 |
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274 | alias_method(:pubDate, :date)
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275 | alias_method(:pubDate=, :date=)
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276 |
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277 | def current_element(rss)
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278 | rss.channel
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279 | end
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280 |
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281 | class SkipDaysBase
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282 | include Base
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283 |
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284 | def_array_element("days")
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285 |
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286 | def new_day
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287 | day = self.class::Day.new(@maker)
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288 | @days << day
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289 | if block_given?
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290 | yield day
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291 | else
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292 | day
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293 | end
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294 | end
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295 |
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296 | def current_element(rss)
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297 | rss.channel.skipDays
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298 | end
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299 |
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300 | class DayBase
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301 | include Base
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302 |
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303 | %w(content).each do |element|
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304 | attr_accessor element
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305 | add_need_initialize_variable(element)
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306 | end
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307 |
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308 | def current_element(rss)
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309 | rss.channel.skipDays.last
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310 | end
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311 |
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312 | end
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313 | end
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314 |
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315 | class SkipHoursBase
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316 | include Base
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317 |
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318 | def_array_element("hours")
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319 |
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320 | def new_hour
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321 | hour = self.class::Hour.new(@maker)
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322 | @hours << hour
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323 | if block_given?
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324 | yield hour
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325 | else
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326 | hour
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327 | end
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328 | end
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329 |
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330 | def current_element(rss)
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331 | rss.channel.skipHours
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332 | end
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333 |
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334 | class HourBase
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335 | include Base
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336 |
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337 | %w(content).each do |element|
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338 | attr_accessor element
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339 | add_need_initialize_variable(element)
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340 | end
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341 |
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342 | def current_element(rss)
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343 | rss.channel.skipHours.last
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344 | end
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345 |
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346 | end
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347 | end
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348 |
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349 | class CloudBase
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350 | include Base
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351 |
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352 | %w(domain port path registerProcedure protocol).each do |element|
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353 | attr_accessor element
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354 | add_need_initialize_variable(element)
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355 | end
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356 |
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357 | def current_element(rss)
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358 | rss.channel.cloud
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359 | end
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360 |
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361 | end
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362 |
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363 | class CategoriesBase
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364 | include Base
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365 |
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366 | def_array_element("categories")
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367 |
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368 | def new_category
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369 | category = self.class::Category.new(@maker)
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370 | @categories << category
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371 | if block_given?
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372 | yield category
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373 | else
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374 | category
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375 | end
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376 | end
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377 |
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378 | class CategoryBase
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379 | include Base
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380 |
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381 | %w(domain content).each do |element|
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382 | attr_accessor element
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383 | add_need_initialize_variable(element)
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384 | end
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385 | end
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386 | end
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387 | end
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388 |
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389 | class ImageBase
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390 | include Base
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391 |
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392 | %w(title url width height description).each do |element|
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393 | attr_accessor element
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394 | add_need_initialize_variable(element)
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395 | end
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396 |
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397 | def link
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398 | @maker.channel.link
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399 | end
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400 |
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401 | def current_element(rss)
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402 | rss.image
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403 | end
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404 | end
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405 |
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406 | class ItemsBase
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407 | include Base
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408 |
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409 | def_array_element("items")
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410 |
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411 | attr_accessor :do_sort, :max_size
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412 |
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413 | def initialize(maker)
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414 | super
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415 | @do_sort = false
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416 | @max_size = -1
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417 | end
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418 |
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419 | def normalize
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420 | if @max_size >= 0
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421 | sort_if_need[0...@max_size]
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422 | else
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423 | sort_if_need[0..@max_size]
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424 | end
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425 | end
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426 |
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427 | def current_element(rss)
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428 | rss.items
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429 | end
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430 |
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431 | def new_item
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432 | item = self.class::Item.new(@maker)
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433 | @items << item
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434 | if block_given?
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435 | yield item
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436 | else
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437 | item
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438 | end
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439 | end
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440 |
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441 | private
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442 | def sort_if_need
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443 | if @do_sort.respond_to?(:call)
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444 | @items.sort do |x, y|
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445 | @do_sort.call(x, y)
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446 | end
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447 | elsif @do_sort
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448 | @items.sort do |x, y|
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449 | y <=> x
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450 | end
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451 | else
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452 | @items
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453 | end
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454 | end
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455 |
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456 | class ItemBase
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457 | include Base
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458 |
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459 | %w(guid enclosure source categories).each do |element|
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460 | attr_reader element
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461 | add_other_element(element)
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462 | add_need_initialize_variable(element, "make_#{element}")
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463 | module_eval(<<-EOC, __FILE__, __LINE__)
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464 | private
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465 | def setup_#{element}(rss, current)
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466 | @#{element}.to_rss(rss, current)
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467 | end
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468 |
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469 | def make_#{element}
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470 | self.class::#{Utils.to_class_name(element)}.new(@maker)
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471 | end
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472 | EOC
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473 | end
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474 |
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475 | %w(title link description date author comments).each do |element|
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476 | attr_accessor element
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477 | add_need_initialize_variable(element)
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478 | end
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479 |
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480 | alias_method(:pubDate, :date)
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481 | alias_method(:pubDate=, :date=)
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482 |
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483 | def <=>(other)
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484 | if date and other.date
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485 | date <=> other.date
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486 | elsif date
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487 | 1
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488 | elsif other.date
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489 | -1
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490 | else
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491 | 0
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492 | end
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493 | end
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494 |
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495 | def current_element(rss)
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496 | rss.items.last
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497 | end
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498 |
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499 | class GuidBase
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500 | include Base
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501 |
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502 | %w(isPermaLink content).each do |element|
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503 | attr_accessor element
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504 | add_need_initialize_variable(element)
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505 | end
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506 | end
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507 |
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508 | class EnclosureBase
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509 | include Base
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510 |
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511 | %w(url length type).each do |element|
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512 | attr_accessor element
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513 | add_need_initialize_variable(element)
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514 | end
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515 | end
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516 |
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517 | class SourceBase
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518 | include Base
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519 |
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520 | %w(url content).each do |element|
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521 | attr_accessor element
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522 | add_need_initialize_variable(element)
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523 | end
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524 | end
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525 |
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526 | CategoriesBase = ChannelBase::CategoriesBase
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527 |
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528 | end
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529 | end
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530 |
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531 | class TextinputBase
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532 | include Base
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533 |
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534 | %w(title description name link).each do |element|
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535 | attr_accessor element
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536 | add_need_initialize_variable(element)
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537 | end
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538 |
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539 | def current_element(rss)
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540 | rss.textinput
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541 | end
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542 |
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543 | end
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544 |
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545 | end
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546 | end
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