Class: GEPUB::Meta

Inherits:
Object
  • Object
show all
Defined in:
lib/gepub/meta.rb

Overview

Holds one metadata with refine meta elements.

Direct Known Subclasses

DateMeta

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, content, parent, attributes = {}, refiners = {}) ⇒ Meta

Returns a new instance of Meta.



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# File 'lib/gepub/meta.rb', line 9

def initialize(name, content, parent, attributes= {}, refiners = {})
  @parent = parent
  @name = name
  @content = content
  @attributes = attributes
  @refiners = refiners
  @parent.register_meta(self) unless @parent.nil?
end

Instance Attribute Details

#content ⇒ Object

Returns the value of attribute content.



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# File 'lib/gepub/meta.rb', line 7

def content
  @content
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/gepub/meta.rb', line 8

def name
  @name
end

Instance Method Details

#[](x) ⇒ Object 



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# File 'lib/gepub/meta.rb', line 18

def [](x)
  @attributes[x]
end

#[]=(x, y) ⇒ Object 



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# File 'lib/gepub/meta.rb', line 22

def []=(x,y)
  @attributes[x] = y
end

#add_alternates(alternates = {}) ⇒ Object

add alternate script refiner.



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# File 'lib/gepub/meta.rb', line 73

def add_alternates(alternates = {})
  alternates.each {
    |locale, content|
    add_refiner('alternate-script', content, { 'xml:lang' => locale })
  }
  self
end

#add_refiner(property, content, attributes = {}) ⇒ Object

add a refiner.



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# File 'lib/gepub/meta.rb', line 50

def add_refiner(property, content, attributes = {})
  (@refiners[property] ||= []) << refiner = Meta.new('meta', content, @parent, { 'property' => property }.merge(attributes)) unless content.nil?
  self
end

#list_alternates ⇒ Object 



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# File 'lib/gepub/meta.rb', line 81

def list_alternates
  list = refiner_list('alternate-script').map {
    |refiner|
    [ refiner['xml:lang'], refiner.content ]
  }
  Hash[*list.flatten]
end

#refine(property, content, attributes = {}) ⇒ Object

set a ‘unique’ refiner. all other refiners with same property will be removed.



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# File 'lib/gepub/meta.rb', line 56

def refine(property, content, attributes = {})
  if !content.nil?
    refiner_clear(property)
    add_refiner(property, content, attributes)
  end
  self
end

#refiner(name) ⇒ Object 



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# File 'lib/gepub/meta.rb', line 40

def refiner(name)
  refiner = @refiners[name]
  if refiner.nil? || refiner.size == 0
    nil
  else
    refiner[0]
  end
end

#refiner_clear(name) ⇒ Object 



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# File 'lib/gepub/meta.rb', line 30

def refiner_clear(name)
  if !@refiners[name].nil?
    @refiners[name].each {
      |refiner|
      @parent.unregister_meta(refiner)
    }
  end
  @refiners[name]= []
end

#refiner_list(name) ⇒ Object 



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# File 'lib/gepub/meta.rb', line 26

def refiner_list(name)
  return @refiners[name].dup
end

#to_s(locale = nil) ⇒ Object 



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# File 'lib/gepub/meta.rb', line 110

def to_s(locale=nil)
  localized = nil
  if !locale.nil?
    prefix = locale.sub(/^(.+?)-.*/, '\1')
    regex = Regexp.new("^((" + locale.split('-').join(')?-?(') + ")?)")
    candidates = @refiners['alternate-script'].select {
      |refiner|
      refiner['xml:lang'] =~ /^#{prefix}-?.*/
    }.sort_by {
      |x|
      x['xml:lang'] =~ regex; $1.size
    }.reverse
    localized = candidates[0].content if candidates.size > 0
  end
  (localized || self.content || super).to_s
end

#to_xml(builder, id_pool, ns = nil, additional_attr = {}, opf_version = '3.0') ⇒ Object 



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# File 'lib/gepub/meta.rb', line 89

def to_xml(builder, id_pool, ns = nil, additional_attr = {}, opf_version = '3.0')
  additional_attr ||= {}
  if @refiners.size > 0 && opf_version.to_f >= 3.0
    @attributes['id'] = id_pool.generate_key(:prefix => name) if @attributes['id'].nil?
  end

  # using eval to parametarize Namespace and content.
  eval "builder#{ ns.nil? || @name == 'meta' ? '' : '[ns]'}.#{@name}(@attributes.reject{|k,v| v.nil?}.merge(additional_attr)#{@content.nil? ? '' : ',  self.to_s'})"

  if @refiners.size > 0 && opf_version.to_f >= 3.0
    additional_attr['refines'] = "##{@attributes['id']}"
    @refiners.each {
      |k, ref_list|
      ref_list.each {
        |ref|
        ref.to_xml(builder, id_pool, nil, additional_attr)
      }
    }
  end
end