Class: Condenser::CSSMediaCombinerProcessor

Inherits:
Object
  • Object
show all
Includes:
ParseHelpers
Defined in:
lib/condenser/processors/css_media_combiner_processor.rb

Instance Attribute Summary

Attributes included from ParseHelpers

#matched

Class Method Summary collapse

Instance Method Summary collapse

Methods included from ParseHelpers

#current_line, #cursor, #eos?, #forward, #gobble, #next_word, #pre_match, #rewind, #scan_until, #seek

Class Method Details

.call(environment, input) ⇒ Object 



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# File 'lib/condenser/processors/css_media_combiner_processor.rb', line 8

def self.call(environment, input)
  new.call(environment, input)
end

.setup(env) ⇒ Object 



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# File 'lib/condenser/processors/css_media_combiner_processor.rb', line 5

def self.setup(env)
end

Instance Method Details

#call(environment, input) ⇒ Object 



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# File 'lib/condenser/processors/css_media_combiner_processor.rb', line 25

def call(environment, input)
  seek(0)
  @sourcefile = input[:source_file]
  @source = input[:source]
  @stack =  []
  @selectors = []
  @media_queries = {}

  input[:source] = ''
  while !eos?
    output = if @selectors.empty?
      input[:source]
    else
      (@selectors[0...-1].reduce(@media_queries) { |hash, selector| hash[selector] ||= {} }[@selectors.last] ||= '')
    end
    
    case @stack.last
    when :media_query
      scan_until(/(@media[^\{]*{|\{|\})/)
      case matched
      when '{'
        output << pre_match << matched
        @stack << :statement
      when '}'
        output << pre_match
        @stack.pop
        @selectors.pop
      else
        output << pre_match
        @selectors << matched.squish
        @stack << :media_query
      end
    when :statement
      scan_until(/(\{|\})/)
      output << pre_match << matched
      case matched
      when '{'
        @stack << :statement
      when '}'
        @stack.pop
      end
    else
      case scan_until(/(@media[^\{]*{|\Z)/)
      when ''
        output << pre_match
      else
        output << pre_match
        @selectors << matched.squish
        @stack << :media_query
      end
    end
  end

  input[:source] << reduce_media_query(@media_queries)
end

#reduce_media_query(queries) ⇒ Object 



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# File 'lib/condenser/processors/css_media_combiner_processor.rb', line 12

def reduce_media_query(queries)
  output = ''
  queries.each do |query, contents|
    output << query if query
    output << if contents.is_a?(Hash)
      reduce_media_query(contents)
    else
      contents + '}'
    end
  end
  output
end