Class: HTML5::Filters::InjectMetaCharset

Inherits:
Base
  • Object
show all
Defined in:
lib/html5/filters/inject_meta_charset.rb

Instance Method Summary collapse

Constructor Details

#initialize(source, encoding) ⇒ InjectMetaCharset

Returns a new instance of InjectMetaCharset.



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# File 'lib/html5/filters/inject_meta_charset.rb', line 6

def initialize(source, encoding)
  super(source)
  @encoding = encoding
end

Instance Method Details

#each ⇒ Object 



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# File 'lib/html5/filters/inject_meta_charset.rb', line 11

def each
  state = :pre_head
  meta_found = @encoding.nil?
  pending = []

  __getobj__.each do |token|
    case token[:type]
    when :StartTag
      state = :in_head if token[:name].downcase == "head"

    when :EmptyTag
      if token[:name].downcase == "meta"
        # replace charset with actual encoding
        token[:data].each_with_index do |(name, value), index|
          if name == 'charset'
            token[:data][index][1] = @encoding
            meta_found = true
          end
        end

        # replace charset with actual encoding
        has_http_equiv_content_type = false
        content_index = -1
        token[:data].each_with_index do |(name, value), i|
          if name.downcase == 'charset'
            token[:data][i] = ['charset', @encoding]
            meta_found = true
            break
          elsif name == 'http-equiv' and value.downcase == 'content-type'
            has_http_equiv_content_type = true
          elsif name == 'content'
            content_index = i
          end
        end

        if !meta_found
          if has_http_equiv_content_type && content_index >= 0
            token[:data][content_index][1] = 'text/html; charset=%s' % @encoding
            meta_found = true
          end
        end

      elsif token[:name].downcase == "head" && !meta_found
        # insert meta into empty head
        yield :type => :StartTag, :name => "head", :data => token[:data]
        yield :type => :EmptyTag, :name => "meta", :data => [["charset", @encoding]]
        yield :type => :EndTag,   :name => "head"
        meta_found = true
        next
      end

    when :EndTag
      if token[:name].downcase == "head" && pending.any?
        # insert meta into head (if necessary) and flush pending queue
        yield pending.shift
        yield :type => :EmptyTag, :name => "meta", :data => [["charset", @encoding]] if !meta_found
        yield pending.shift while pending.any?
        meta_found = true
        state = :post_head
      end
    end

    if state == :in_head
      pending << token
    else
      yield token
    end
  end
end