Class: Ruby2Js

Inherits:
SexpProcessor
  • Object
show all
Defined in:
lib/linguify/translators/javascript.rb

Constant Summary collapse

VERSION = 
'1.3.1'
LINE_LENGTH = 
78
BINARY = 
[:<=>, :==, :<, :>, :<=, :>=, :-, :+, :*, :/, :%, :<<, :>>, :**]
ASSIGN_NODES =

Nodes that represent assignment and probably need () around them.

TODO: this should be replaced with full precedence support :/

[
 :dasgn,
 :flip2,
 :flip3,
 :lasgn,
 :masgn,
 :attrasgn,
 :op_asgn1,
 :op_asgn2,
 :op_asgn_and,
 :op_asgn_or,
 :return,
 :if, # HACK
]

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Ruby2Js

Returns a new instance of Ruby2Js.



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# File 'lib/linguify/translators/javascript.rb', line 57

def initialize
  super
  @indent = "  "
  self.auto_shift_type = true
  self.strict = true
  self.expected = String

  @calls = []

  # self.debug[:defn] = /zsuper/
end

Instance Method Details

#cond_loop(exp, name) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 82

def cond_loop(exp, name)
  cond = process(exp.shift)
  body = process(exp.shift)
  head_controlled = exp.shift

  body = indent(body).chomp if body

  code = []
  if head_controlled then
    if name == 'until'
      code << "while(!#{cond}){"
    else
      code << "#{name}(#{cond}){"
    end
    code << body if body
    code << "}"
  else
    code << "begin"
    code << body if body
    code << "end #{name} #{cond}"
  end
  code.join("\n")
end

#indent(s) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 78

def indent(s)
  s.to_s.split(/\n/).map{|line| @indent + line}.join("\n")
end

#parenthesize(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 69

def parenthesize exp
  case self.context[1]
  when nil, :scope, :if, :iter, :resbody, :when, :while, :until then
    exp
  else
    "(#{exp})"
  end
end

#process_and(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 106

def process_and(exp)
  parenthesize "#{process exp.shift} && #{process exp.shift}"
end

#process_arglist(exp) ⇒ Object

custom made node



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# File 'lib/linguify/translators/javascript.rb', line 110

def process_arglist(exp) # custom made node
  code = []
  until exp.empty? do
    code << process(exp.shift)
  end
  code.join ', '
end

#process_args(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 118

def process_args(exp)
  args = []

  until exp.empty? do
    arg = exp.shift
    case arg
    when Symbol then
      args << arg
    when Array then
      case arg.first
      when :block then
        asgns = {}
        arg[1..-1].each do |lasgn|
          asgns[lasgn[1]] = process(lasgn)
        end

        args.each_with_index do |name, index|
          args[index] = asgns[name] if asgns.has_key? name
        end
      else
        raise "unknown arg type #{arg.first.inspect}"
      end
    else
      raise "unknown arg type #{arg.inspect}"
    end
  end

  return "(#{args.join ', '})"
end

#process_array(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 148

def process_array(exp)
  "[#{process_arglist(exp)}]"
end

#process_attrasgn(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 152

def process_attrasgn(exp)
  receiver = process exp.shift
  name = exp.shift
  args = exp.empty? ? nil : exp.shift

  case name
  when :[]= then
    rhs = process args.pop
    "#{receiver}[#{process(args)}] = #{rhs}"
  else
    name = name.to_s.sub(/=$/, '')
    if args && args != s(:arglist) then
      "#{receiver}.#{name} = #{process(args)}"
    end
  end
end

#process_block(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 169

def process_block(exp)
  result = []
  
  exp << nil if exp.empty?
  until exp.empty? do
    code = exp.shift
    if code.nil? or code.first == :nil then
      result << "# do nothing\n"
    else
      result << process(code)
    end
  end

  result = parenthesize result.join ";\n"
  result += ";\n" unless result.start_with? "("

  return result
end

#process_break(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 188

def process_break(exp)
  val = exp.empty? ? nil : process(exp.shift)
  # HACK "break" + (val ? " #{val}" : "")
  if val then
    "break #{val}"
  else
    "break"
  end
end

#process_call(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 198

def process_call(exp)
  receiver_node_type = exp.first.nil? ? nil : exp.first.first
  receiver = process exp.shift
  receiver = "(#{receiver})" if ASSIGN_NODES.include? receiver_node_type

  name = exp.shift
  args = []
  raw = []

  # this allows us to do both old and new sexp forms:
  exp.push(*exp.pop[1..-1]) if exp.size == 1 && exp.first.first == :arglist

  @calls.push name

  in_context :arglist do
    until exp.empty? do
      arg_type = exp.first.sexp_type
      e = exp.shift
      raw << e.dup
      arg = process e

      next if arg.empty?

      strip_hash = (arg_type == :hash and
                    not BINARY.include? name and
                    (exp.empty? or exp.first.sexp_type == :splat))
      wrap_arg = Ruby2Ruby::ASSIGN_NODES.include? arg_type

      arg = arg[2..-3] if strip_hash
      arg = "(#{arg})" if wrap_arg

      args << arg
    end
  end

  case name
  when *BINARY then
    "(#{receiver} #{name} #{args.join(', ')})"
  when :[] then
    receiver ||= "self"
    if raw.size == 1 && raw.first.sexp_type == :lit && raw.first.to_a[1].kind_of?(Symbol)
      "#{receiver}.#{args.first[1..-1]}"
    else
      "#{receiver}[#{args.join(', ')}]"
    end
  when :[]= then
    receiver ||= "self"
    rhs = args.pop
    "#{receiver}[#{args.join(', ')}] = #{rhs}"
  when :"-@" then
    "-#{receiver}"
  when :"+@" then
    "+#{receiver}"
  when :new
    args     = nil                   if args.empty?
    args     = "(#{args.join(',')})" if args
    receiver = "#{receiver}"         if receiver

    "#{name} #{receiver}#{args}"
  when :lambda
    receiver = "#{receiver}."        if receiver

    "#{receiver}function"
  when :this # this.something
    receiver = "#{receiver}."      if receiver
    "#{receiver}#{name}"
  else
    args     = nil                 if args.empty?
    args     = "#{args.join(',')}" if args
    receiver = "#{receiver}."      if receiver

    "#{receiver}#{name}(#{args})"
  end
ensure
  @calls.pop
end

#process_const(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 275

def process_const(exp)
  exp.shift.to_s
end

#process_defn(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 279

def process_defn(exp)
  type1 = exp[1].first
  type2 = exp[2].first rescue nil

  if type1 == :args and [:ivar, :attrset].include? type2 then
    name = exp.shift
    case type2
    when :ivar then
      exp.clear
      return "attr_reader #{name.inspect}"
    when :attrset then
      exp.clear
      return "attr_writer :#{name.to_s[0..-2]}"
    else
      raise "Unknown defn type: #{exp.inspect}"
    end
  end

  case type1
  when :scope, :args then
    name = exp.shift
    args = process(exp.shift)
    args = "" if args == "()"
    body = []
    until exp.empty? do
      body << indent(process(exp.shift))
    end
    body = body.join("\n")
    return "#{exp.comments}#{name}#{args}{\n#{body}\n}".gsub(/\n\s*\n+/, "\n")
  else
    raise "Unknown defn type: #{type1} for #{exp.inspect}"
  end
end

#process_hash(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 313

def process_hash(exp)
  result = []

  until exp.empty?
    e = exp.shift
    if e.sexp_type == :lit
      lhs = process(e)
      rhs = exp.shift
      t = rhs.first
      rhs = process rhs
      rhs = "(#{rhs})" unless [:lit, :str, :array, :iter].include? t # TODO: verify better!

      result << "\n#{lhs[1..-1]}: #{rhs}"
    else
      lhs = process(e)
      rhs = exp.shift
      t = rhs.first
      rhs = process rhs
      rhs = "(#{rhs})" unless [:lit, :str].include? t # TODO: verify better!

      result << "\n#{lhs}: #{rhs}"
    end
  end

  return "{ #{indent(result.join(', '))} }"
end

#process_iasgn(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 340

def process_iasgn(exp)
  lhs = exp.shift
  if exp.empty? then # part of an masgn
    lhs.to_s
  else
    if lhs.to_s[0] == '@'
      "this.#{lhs.to_s[1..-1]} = #{process exp.shift}"
    else
      "#{lhs} = #{process exp.shift}"
    end
  end
end

#process_if(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 353

def process_if(exp)
  expand = Ruby2Ruby::ASSIGN_NODES.include? exp.first.first
  c = process exp.shift
  t_type = exp.first.sexp_type if exp.first
  t = process exp.shift
  f_type = exp.first.sexp_type if exp.first
  f = process exp.shift

  c = "(#{c.chomp})" #if c =~ /\n/

  if t then
    #unless expand then
    #  if f then
    #    r = "#{c} ? (#{t}) : (#{f})"
    #    r = nil if r =~ /return/ # HACK - need contextual awareness or something
    #  else
    #    r = "#{t} if #{c}"
    #  end
    #  return r if r and (@indent+r).size < LINE_LENGTH and r !~ /\n/
    #end

    r = "if#{c}{\n#{indent(t)}#{[:block, :while, :if].include?(t_type) ? '':';'}\n"
    r << "}else{\n#{indent(f)}#{[:block, :while, :if].include?(f_type) ? '':';'}\n" if f
    r << "}"

    r
  elsif f
    unless expand then
      r = "#{f} unless #{c}"
      return r if (@indent+r).size < LINE_LENGTH and r !~ /\n/
    end
    "if(!#{c}){\n#{indent(f)}\n}"
  else
    # empty if statement, just do it in case of side effects from condition
    "if #{c}{\n#{indent '// do nothing'}\n}"
  end
end

#process_iter(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 391

def process_iter(exp)
  iter = process exp.shift
  args = exp.shift
  args = (args == 0) ? '' : process(args)
  body = exp.empty? ? nil : process(exp.shift)

  b, e = #if iter == "END" then
           [ "{", "}" ]
         #else
        #   [ "do", "end" ]
        # end

  iter.sub!(/\(\)$/, '')

  result = []
  result << "#{iter}(#{args})"
  result << "#{b}"
  result << "\n"
  if body then
    result << indent(body.strip)
    result << "\n"
  end
  result << e
  result.join
end

#process_ivar(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 417

def process_ivar(exp)
  "this.#{exp.shift.to_s[1..-1]}"
end

#process_lasgn(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 421

def process_lasgn(exp)
  s = "#{exp.shift}"
  s += " = #{process exp.shift}" unless exp.empty?
  s
end

#process_lit(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 427

def process_lit(exp)
  obj = exp.shift
  case obj
  when Range then
    "(#{obj.inspect})"
  else
    obj.inspect
  end
end

#process_lvar(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 437

def process_lvar(exp)
  exp.shift.to_s
end

#process_masgn(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 441

def process_masgn(exp)
  lhs = exp.shift
  rhs = exp.empty? ? nil : exp.shift

  case lhs.first
  when :array then
    lhs.shift
    lhs = lhs.map do |l|
      case l.first
      when :masgn then
        "(#{process(l)})"
      else
        process(l)
      end
    end
  when :lasgn then
    lhs = [ splat(lhs.last) ]
  when :splat then
    lhs = [ :"*" ]
  else
    raise "no clue: #{lhs.inspect}"
  end

  if context[1] == :iter and rhs then
    lhs << splat(rhs[1])
    rhs = nil
  end

  unless rhs.nil? then
    t = rhs.first
    rhs = process rhs
    rhs = rhs[1..-2] if t == :array # FIX: bad? I dunno
    return "#{lhs.join(", ")} = #{rhs}"
  else
    return lhs.join(", ")
  end
end

#process_nil(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 479

def process_nil(exp)
  "null"
end

#process_return(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 483

def process_return(exp)
  if exp.empty? then
    return "return"
  else
    return "return #{process exp.shift}"
  end
end

#process_scope(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 491

def process_scope(exp)
  exp.empty? ? "" : process(exp.shift)
end

#process_str(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 495

def process_str(exp)
  "\"#{exp.shift.to_s}\""
end

#process_true(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 499

def process_true(exp)
  "true"
end

#process_until(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 503

def process_until(exp)
  cond_loop(exp, 'until')
end

#process_while(exp) ⇒ Object 



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# File 'lib/linguify/translators/javascript.rb', line 507

def process_while(exp)
  cond_loop(exp, 'while')
end