1 | require 'rss/1.0'
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2 | require 'rss/dublincore'
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3 |
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4 | module RSS
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5 |
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6 | IMAGE_PREFIX = 'image'
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7 | IMAGE_URI = 'http://web.resource.org/rss/1.0/modules/image/'
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8 |
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9 | RDF.install_ns(IMAGE_PREFIX, IMAGE_URI)
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10 |
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11 | IMAGE_ELEMENTS = []
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12 |
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13 | %w(item favicon).each do |name|
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14 | class_name = Utils.to_class_name(name)
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15 | BaseListener.install_class_name(IMAGE_URI, name, "Image#{class_name}")
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16 | IMAGE_ELEMENTS << "#{IMAGE_PREFIX}_#{name}"
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17 | end
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18 |
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19 | module ImageModelUtils
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20 | def validate_one_tag_name(ignore_unknown_element, name, tags)
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21 | if !ignore_unknown_element
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22 | invalid = tags.find {|tag| tag != name}
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23 | raise UnknownTagError.new(invalid, IMAGE_URI) if invalid
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24 | end
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25 | raise TooMuchTagError.new(name, tag_name) if tags.size > 1
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26 | end
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27 | end
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28 |
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29 | module ImageItemModel
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30 | include ImageModelUtils
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31 | extend BaseModel
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32 |
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33 | def self.append_features(klass)
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34 | super
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35 |
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36 | klass.install_have_child_element("item", IMAGE_URI, "?",
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37 | "#{IMAGE_PREFIX}_item")
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38 | klass.install_must_call_validator(IMAGE_PREFIX, IMAGE_URI)
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39 | end
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40 |
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41 | class ImageItem < Element
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42 | include RSS10
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43 | include DublinCoreModel
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44 |
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45 | @tag_name = "item"
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46 |
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47 | class << self
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48 | def required_prefix
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49 | IMAGE_PREFIX
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50 | end
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51 |
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52 | def required_uri
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53 | IMAGE_URI
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54 | end
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55 | end
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56 |
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57 | install_must_call_validator(IMAGE_PREFIX, IMAGE_URI)
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58 |
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59 | [
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60 | ["about", ::RSS::RDF::URI, true],
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61 | ["resource", ::RSS::RDF::URI, false],
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62 | ].each do |name, uri, required|
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63 | install_get_attribute(name, uri, required, nil, nil,
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64 | "#{::RSS::RDF::PREFIX}:#{name}")
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65 | end
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66 |
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67 | %w(width height).each do |tag|
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68 | full_name = "#{IMAGE_PREFIX}_#{tag}"
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69 | disp_name = "#{IMAGE_PREFIX}:#{tag}"
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70 | install_text_element(tag, IMAGE_URI, "?",
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71 | full_name, :integer, disp_name)
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72 | BaseListener.install_get_text_element(IMAGE_URI, tag, "#{full_name}=")
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73 | end
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74 |
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75 | alias width= image_width=
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76 | alias width image_width
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77 | alias height= image_height=
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78 | alias height image_height
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79 |
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80 | def initialize(*args)
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81 | if Utils.element_initialize_arguments?(args)
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82 | super
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83 | else
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84 | super()
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85 | self.about = args[0]
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86 | self.resource = args[1]
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87 | end
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88 | end
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89 |
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90 | def full_name
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91 | tag_name_with_prefix(IMAGE_PREFIX)
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92 | end
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93 |
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94 | private
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95 | def maker_target(target)
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96 | target.image_item
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97 | end
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98 |
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99 | def setup_maker_attributes(item)
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100 | item.about = self.about
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101 | item.resource = self.resource
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102 | end
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103 | end
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104 | end
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105 |
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106 | module ImageFaviconModel
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107 | include ImageModelUtils
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108 | extend BaseModel
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109 |
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110 | def self.append_features(klass)
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111 | super
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112 |
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113 | unless klass.class == Module
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114 | klass.install_have_child_element("favicon", IMAGE_URI, "?",
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115 | "#{IMAGE_PREFIX}_favicon")
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116 | klass.install_must_call_validator(IMAGE_PREFIX, IMAGE_URI)
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117 | end
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118 | end
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119 |
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120 | class ImageFavicon < Element
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121 | include RSS10
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122 | include DublinCoreModel
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123 |
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124 | @tag_name = "favicon"
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125 |
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126 | class << self
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127 | def required_prefix
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128 | IMAGE_PREFIX
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129 | end
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130 |
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131 | def required_uri
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132 | IMAGE_URI
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133 | end
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134 | end
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135 |
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136 | [
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137 | ["about", ::RSS::RDF::URI, true, ::RSS::RDF::PREFIX],
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138 | ["size", IMAGE_URI, true, IMAGE_PREFIX],
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139 | ].each do |name, uri, required, prefix|
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140 | install_get_attribute(name, uri, required, nil, nil,
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141 | "#{prefix}:#{name}")
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142 | end
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143 |
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144 | AVAILABLE_SIZES = %w(small medium large)
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145 | alias_method :_size=, :size=
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146 | private :_size=
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147 | def size=(new_value)
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148 | if @do_validate and !new_value.nil?
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149 | new_value = new_value.strip
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150 | unless AVAILABLE_SIZES.include?(new_value)
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151 | attr_name = "#{IMAGE_PREFIX}:size"
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152 | raise NotAvailableValueError.new(full_name, new_value, attr_name)
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153 | end
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154 | end
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155 | __send__(:_size=, new_value)
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156 | end
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157 |
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158 | alias image_size= size=
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159 | alias image_size size
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160 |
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161 | def initialize(*args)
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162 | if Utils.element_initialize_arguments?(args)
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163 | super
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164 | else
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165 | super()
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166 | self.about = args[0]
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167 | self.size = args[1]
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168 | end
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169 | end
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170 |
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171 | def full_name
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172 | tag_name_with_prefix(IMAGE_PREFIX)
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173 | end
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174 |
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175 | private
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176 | def maker_target(target)
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177 | target.image_favicon
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178 | end
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179 |
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180 | def setup_maker_attributes(favicon)
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181 | favicon.about = self.about
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182 | favicon.size = self.size
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183 | end
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184 | end
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185 |
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186 | end
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187 |
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188 | class RDF
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189 | class Channel; include ImageFaviconModel; end
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190 | class Item; include ImageItemModel; end
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191 | end
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192 |
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193 | end
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