Module: Wunderbar::Filter::JQuery

Includes:
Ruby2JS::Filter::SEXP
Defined in:
lib/wunderbar/jquery/filter.rb

Instance Method Summary collapse

Instance Method Details

#initialize(*args) ⇒ Object 



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# File 'lib/wunderbar/jquery/filter.rb', line 11

def initialize(*args)
  @_jqchild = nil
  super
end

#on_block(node) ⇒ Object 



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# File 'lib/wunderbar/jquery/filter.rb', line 125

def on_block(node)
  return super unless node.children[1].children.empty?
  return super if @react

  # traverse through potential "css proxy" style method calls
  child = node.children.first
  test = child.children.first
  while test and test.type == :send and not test.is_method?
    child, test = test, test.children.first
  end

  # append block as a standalone proc to wunderbar style method call
  if child.children[0] == nil and child.children[1] =~ /^_\w/
    block = s(:block, s(:send, nil, :proc), 
      s(:args, s(:arg, :_index), s(:arg, :_parent)),
      *node.children[2..-1])
    return on_send s(:send, *node.children.first.children, block)
  end

  super
end

#on_send(node) ⇒ Object 



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# File 'lib/wunderbar/jquery/filter.rb', line 16

def on_send(node)
  return super if @react

  if node.children[0] == nil and node.children[1] =~ /^_\w/
    # map method calls starting with an underscore to jquery calls
    # to create an element.  
    #
    # input:
    #   _a 'name', href: 'link'
    # output:
    #  $('<a></a>').text('name').attr(href: 'link')
    #
    tag = node.children[1].to_s[1..-1]
    if Node::VOID.include? tag
      element = s(:send, s(:str, "<#{tag}/>"), :~) 
    else
      element = s(:send, s(:str, "<#{tag}></#{tag}>"), :~) 
    end
    node.children[2..-1].each do |child|
      if child.type == :hash
        # convert _ to - in attribute names
        pairs = child.children.map do |pair|
          key, value = pair.children
          if key.type == :sym
            s(:pair, s(:str, key.children[0].to_s.gsub('_', '-')), value)
          else
            pair
          end
        end

        element = s(:send, element, :attr, s(:hash, *pairs))

      elsif child.type == :addClass
        # :addClass arguments are inserted by "css proxy" logic below
        element = s(:send, element, :addClass, s(:sym, *child.children))

      elsif child.type == :block
        # :block arguments are inserted by on_block logic below
        element = s(:block, s(:send, element, :each!), 
          *node.children.last.children[1..-1])

      else
        # everything else added as text
        element = s(:send, element, :text, child)

      end
    end

    begin
      jqchild, @_jqchild = @_jqchild, true

      # have nested elements append themselves to their parent
      if jqchild
        element = s(:send, element, :appendTo, 
          s(:send, s(:lvar, :_parent), :~))
      end

      process element
    ensure
      @_jqchild = jqchild
    end

  elsif node.children[0] and node.children[0].type == :send
    # determine if markaby style class and id names are being used
    child = node
    test = child.children.first
    while test and test.type == :send and not test.is_method?
      child, test = test, test.children.first
    end

    if child.children[0] == nil and child.children[1] =~ /^_\w/
      # capture the arguments provided on the current node
      children = node.children[2..-1]

      # convert method calls to id and class values
      prefix = []
      while node != child
        if node.children[1] !~ /!$/
          # add class (mapping underscores to dashes)
          prefix.unshift s(:addClass, node.children[1].to_s.gsub('_','-'))
        else
          # convert method name to hash {id: name} pair
          pair = s(:pair, s(:sym, :id), 
            s(:str, node.children[1].to_s[0..-2].gsub('_','-')))

          # if a hash argument is already passed, merge in id value
          hash = children.find_index {|cnode| cnode.type == :hash}
          if hash
            children[hash] = s(:hash, pair, *children[hash].children)
          else
            prefix.unshift s(:hash, pair)
          end
        end

        # advance to next node
        node = node.children.first
      end

      # collapse series of method calls into a single call
      return process(s(:send, *node.children[0..1], *prefix, *children))
    else
      super
    end

  else
    super
  end
end