Class: Redom::Parser

Inherits:
Opal::Parser
  • Object
show all
Includes:
Utils
Defined in:
lib/redom/parser.rb

Instance Method Summary collapse

Methods included from Utils

#_dispatcher, #_logger, dispatcher=, logger=

Constructor Details

#initialize(conn) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/redom/parser.rb', line 7

def initialize(conn)
  @conn = conn
end

Instance Method Details

#js_def(recvr, mid, args, stmts, line, end_line) ⇒ Object 



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# File 'lib/redom/parser.rb', line 59

def js_def(recvr, mid, args, stmts, line, end_line)
  jsid = mid_to_jsid(mid.to_s, false)

  if recvr
    @scope.defines_defs = true
    smethod = true if @scope.class_scope? && recvr.first == :self
    recv = process(recvr, :expr)
  else
    @scope.defines_defn = true
    recv = current_self
  end

  code = ''
  params = nil
  scope_name = nil
  uses_super = nil

  # opt args if last arg is sexp
  opt = args.pop if Array === args.last

  # block name &block
  if args.last.to_s.start_with? '&'
    block_name = args.pop.to_s[1..-1].to_sym
  end

  # splat args *splat
  if args.last.to_s.start_with? '*'
    if args.last == :*
      args.pop
    else
      splat = args[-1].to_s[1..-1].to_sym
      args[-1] = splat
      len = args.length - 2
    end
  end

  indent do
    in_scope(:def) do
      @scope.mid  = mid
      @scope.defs = true if recvr

      if block_name
        @scope.uses_block!
      end

      yielder = block_name || '__yield'
      @scope.block_name = yielder

      params = process args, :expr

      opt[1..-1].each do |o|
        next if o[2][2] == :undefined
        id = process s(:lvar, o[1]), :expr
        code += ("if (%s == null) {\n%s%s\n%s}" %
                  [id, @indent + INDENT, process(o, :expre), @indent])
      end if opt

      code += "#{splat} = __slice.call(arguments, #{len});" if splat
      code += "\n#@indent" + process(stmts, :stmt)

      # Returns the identity name if identified, nil otherwise
      scope_name = @scope.identity

      if @scope.uses_block?
        @scope.add_temp '__context'
        @scope.add_temp yielder

        blk = "\n%s%s = %s._p || nil, __context = %s._s, %s._p = null;\n%s" %
          [@indent, yielder, scope_name, yielder, scope_name, @indent]

        code = blk + code
      end

      uses_super = @scope.uses_super

      code = "#@indent#{@scope.to_vars}" + code
    end
  end

  defcode = "#{"#{scope_name} = " if scope_name}function(#{params}) {\n#{code}\n#@indent}"

  if recvr
    if smethod
      @scope.smethods << "$#{mid}"
      "#{ @scope.name }#{jsid} = #{defcode}"
    else
      "#{ recv }#{ jsid } = #{ defcode }"
    end
  elsif @scope.class_scope?
    @scope.methods << "$#{mid}"
    if uses_super
      @scope.add_temp uses_super
      uses_super = "#{uses_super} = #{@scope.proto}#{jsid};\n#@indent"
    end
    "#{uses_super}#{ @scope.proto }#{jsid} = #{defcode}"
  elsif @scope.type == :iter
    "def#{jsid} = #{defcode}"
  elsif @scope.type == :top
    "#{ current_self }#{ jsid } = #{ defcode }"
  else
    "def#{jsid} = #{defcode}"
  end
end

#mid_to_jsid(mid, djs_call = true) ⇒ String

Converts a ruby method name into its javascript equivalent for a method/function call. All ruby method names get prefixed with a ‘$’, and if the name is a valid javascript identifier, it will have a ‘.’ prefix (for dot-calling), otherwise it will be wrapped in brackets to use reference notation calling.

mid_to_jsid('foo')      # => ".$foo"
mid_to_jsid('class')    # => ".$class"
mid_to_jsid('==')       # => "['$==']"
mid_to_jsid('name=')    # => "['$name=']"

Parameters:

  • mid (String) —

    ruby method id

Returns:

  • (String) 


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# File 'lib/redom/parser.rb', line 43

def mid_to_jsid(mid, djs_call = true)
  if /^([a-zA-Z0-9$_]+)=$/ =~ mid.to_s
    ".$djsAssign('#{$1}')"
  elsif '[]' == mid.to_s
    ".$djsCall('')"
  elsif /\=|\+|\-|\*|\/|\!|\?|\<|\>|\&|\||\^|\%|\~|\[/ =~ mid.to_s
    "['$#{mid}']"
  else
    if djs_call
      ".$djsCall('$#{mid}')"
    else
      ".$#{mid}"
    end
  end
end

#process_call(sexp, level) ⇒ Object

s(:call, recv, :mid, s(:arglist)) s(:call, nil, :mid, s(:arglist))



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# File 'lib/redom/parser.rb', line 170

def process_call(sexp, level)
  recv, meth, arglist, iter = sexp
  mid = mid_to_jsid meth.to_s

  case meth
  when :attr_reader, :attr_writer, :attr_accessor
    return handle_attr_optimize(meth, arglist[1..-1])
  when :block_given?
    return js_block_given(sexp, level)
  when :alias_native
    return handle_alias_native(sexp) if @scope.class_scope?
  when :require
    path = arglist[1]

    if path and path[0] == :str
      @requires << path[1]
    end

    return "//= require #{path[1]}"
  when :respond_to?
    return handle_respond_to(sexp, level)
  end

  splat = arglist[1..-1].any? { |a| a.first == :splat }

  if Array === arglist.last and arglist.last.first == :block_pass
    block   = process s(:js_tmp, process(arglist.pop, :expr)), :expr
  elsif iter
    block   = iter
  end

  recv ||= s(:self)

  if block
    tmprecv = @scope.new_temp
  elsif splat and recv != [:self] and recv[0] != :lvar
    tmprecv = @scope.new_temp
  end

  args      = ""

  recv_code = process recv, :recv

  args = process arglist, :expr

  result = if block
    if meth == :sync || meth == :async
      dispatch = "(%s = %s, %s%s._p = %s, %s%s" %
        [tmprecv, recv_code, tmprecv, "#{mid}()", block, tmprecv, mid]
    else
      dispatch = "(%s = %s, %s%s._p = %s, %s%s" %
        [tmprecv, recv_code, tmprecv, mid_to_jsid(meth.to_s, false), block, tmprecv, mid]
    end
    if splat
      "%s.apply(null, %s))" % [dispatch, args]
    else
      "%s(%s))" % [dispatch, args]
    end
  else
    # m_missing = " || __mm(#{meth.to_s.inspect})"
    # dispatch = "((#{tmprecv} = #{recv_code}).$m#{mid}#{ m_missing })"
    # splat ? "#{dispatch}.apply(null, #{args})" : "#{dispatch}(#{args})"
    dispatch = tmprecv ? "(#{tmprecv} = #{recv_code})#{mid}" : "#{recv_code}#{mid}"
    splat ? "#{dispatch}.apply(#{tmprecv || recv_code}, #{args})" : "#{dispatch}(#{args})"
  end

  result
end

#process_const(sexp, level) ⇒ Object

s(:const, :const)



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# File 'lib/redom/parser.rb', line 164

def process_const(sexp, level)
  "__scope.$djsCall('#{sexp.shift}')()"
end

#process_lit(sexp, level) ⇒ Object

s(:lit, 1) s(:lit, :foo)



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# File 'lib/redom/parser.rb', line 13

def process_lit(sexp, level)
  val = sexp.shift
  case val
  when Numeric
    level == :recv ? "(#{val.inspect})" : val.inspect
  when Symbol
    "Opal.$method(#{@conn._cid.inspect}, #{val.to_s.inspect})"
  when Regexp
    val == // ? /^/.inspect : val.inspect
  when Range
    @helpers[:range] = true
    "__range(#{val.begin}, #{val.end}, #{val.exclude_end?})"
  else
    raise "Bad lit: #{val.inspect}"
  end
end