Module: Ruby2JS::Filter::JQuery

Includes:
SEXP
Defined in:
lib/ruby2js/filter/jquery.rb

Instance Method Summary collapse

Methods included from SEXP

#s

Instance Method Details

#initialize ⇒ Object 



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# File 'lib/ruby2js/filter/jquery.rb', line 63

def initialize
  @each = true # disable each mapping, see functions filter
end

#on_gvar(node) ⇒ Object

map $$ to $



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# File 'lib/ruby2js/filter/jquery.rb', line 68

def on_gvar(node)
  if node.children[0] == :$$
    node.updated nil, ['$']
  else
    super
  end
end

#on_send(node) ⇒ Object 



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# File 'lib/ruby2js/filter/jquery.rb', line 76

def on_send(node)
  if [:call, :[]].include? node.children[1]
    # map $$.call(..), $$.(..), and $$[...] to $(...)
    target = process(node.children.first)
    if target.type == :gvar and target.children == ['$']
      s(:send, nil, '$', *process_all(node.children[2..-1]))
    else
      super
    end

  elsif node.children[1] == :~
    # map ~expression.method to $(expression).method

    if node.children[0] and node.children[0].type == :op_asgn
      asgn = node.children[0]
      if asgn.children[0] and asgn.children[0].type == :send
        inner = asgn.children[0]
        return on_send s(:send, s(:send, inner.children[0],
          (inner.children[1].to_s+'=').to_sym,
          s(:send, s(:send, s(:send, inner.children[0], :~),
          *inner.children[1..-1]), *asgn.children[1..-1])), :~)
      else
        return on_send asgn.updated nil, [s(:send, asgn.children[0], :~),
          *asgn.children[1..-1]]
      end
    end

    # See http://api.jquery.com/category/properties/
    props = :context, :jquery, :browser, :fx, :support, :length, :selector
    domprops = %w(checked disabled readonly readOnly required)

    rewrite_tilda = proc do |node|
      # Example conversion:
      #   before:
      #    (send (send (send (send nil :a) :b) :c) :~)
      #   after:
      #    (send (send (send nil "$" (send nil :a)) :b) :c)
      if node.type == :send and node.children[0]
        if node.children[1] == :~ and node.children[0].children[1] == :~
          # consecutive tildes
          if node.children[0].children[0].children[1] == :~
            result = process(node.children[0].children[0].children[0])
          else
            result = s(:send, process(node.children[0].children[0]), :~)
          end
          s(:send, s(:send, result, :~), :~)
        else
          # possible getter/setter
          method = node.children[1]
          method = method.to_s.chomp('=') if method =~ /=$/
          rewrite = [rewrite_tilda[node.children[0]], 
            method, *process_all(node.children[2..-1])]
          if props.include? node.children[1]
            node.updated nil, rewrite
          elsif domprops.include? method.to_s
            method = :readOnly if method.to_s == 'readonly'
            s(:send, rewrite[0], :prop, s(:sym, method), *rewrite[2..-1]) 
          else
            s(:send, *rewrite)
          end
        end
      elsif node.type == :block
        # method call with a block parameter
        node.updated nil, [rewrite_tilda[node.children[0]],
          *process_all(node.children[1..-1])]
      else
        # innermost expression
        s(:send, nil, '$', process(node))
      end
    end

    rewrite_tilda[node].children[0]
  else
    super
  end
end