Class: H2o::Tags::For

Inherits:
Tag show all
Defined in:
lib/h2o/tags/for.rb

Constant Summary collapse

Syntax = 
/
  (?:(#{H2o::IDENTIFIER_RE}),\s?)?
  (#{H2o::IDENTIFIER_RE})\s+in\s+(#{H2o::NAME_RE})\s*
  (reversed)?
/x

Instance Method Summary collapse

Constructor Details

#initialize(parser, argstring) ⇒ For

Returns a new instance of For.



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# File 'lib/h2o/tags/for.rb', line 10

def initialize(parser, argstring)
  @key = false
  @else = false
  @body = parser.parse(:else, :endfor)
  @else = parser.parse(:endfor) if parser.token && parser.token.include?('else')
  
  if matches = Syntax.match(argstring)
    @key = $1.to_sym unless $1.nil?
    @item = $2.to_sym
    @iteratable = $3.to_sym
    @reverse = !$4.nil?
  else
    raise SyntaxError, "Invalid for loop syntax "
  end
end

Instance Method Details

#render(context, stream) ⇒ Object 



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# File 'lib/h2o/tags/for.rb', line 26

def render(context, stream)
  iteratable = context.resolve(@iteratable)
  iteratable.reverse! if @reverse
  length = 0

  if iteratable.respond_to?(:each)
    length = iteratable.size || iteratable.length
  end
  
  if length > 0
    parent = context[:loop]
    index = 0
    # Main iteration
    context.stack do
      iteratable.each do |item|
        if item.is_a?(Array)
          key, value = item
        else
          key = index
          value = item
        end

        is_even = index % 2 != 0
        rev_count = length - index
        context[@item] = value
        context[@key] = key
        context[:loop] = {
          :parent => parent,
          :first => index == 0,
          :last => rev_count == 1,
          :counter => index + 1,
          :counter0 => index,
          :revcounter => rev_count,
          :revcounter0 => rev_count - 1,
          :even => is_even,
          :odd => !is_even
        }
        @body.render(context, stream)
        index += 1
      end
    end
  else
    # Else statement
    @else.render(context, stream) if @else
  end
  nil
end