Class: Ruby2Ruby

Inherits:
SexpProcessor
  • Object
show all
Defined in:
lib/ruby2ruby.rb

Overview

Generate ruby code from a sexp.

Constant Summary collapse

VERSION =

:nodoc:

"2.6.0"
LINE_LENGTH =

cutoff for one-liners

78
BINARY =

binary operation messages

[:<=>, :==, :<, :>, :<=, :>=, :-, :+, :*, :/, :%, :<<, :>>, :**, :"!=", :^, :|, :&]
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,
 :match3,
 :attrasgn,
 :op_asgn1,
 :op_asgn2,
 :op_asgn_and,
 :op_asgn_or,
 :return,
 :if, # HACK
 :rescue,
]
HASH_VAL_NO_PAREN =

Some sexp types are OK without parens when appearing as hash values. This list can include ‘:call`s because they’re always printed with parens around their arguments. For example:

{ :foo => (bar("baz")) } # The outer parens are unnecessary
{ :foo => bar("baz") }   # This is the normal code style

[
  :call,
  :false,
  :lit,
  :lvar,
  :nil,
  :str,
  :true,
]
MUST_BE_CURLY = 
%w[ BEGIN END ]

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Ruby2Ruby

:nodoc:



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# File 'lib/ruby2ruby.rb', line 82

def initialize # :nodoc:
  super
  @indent = "  "
  self.require_empty = false
  self.strict = true
  self.expected = String

  @calls = []

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

Instance Method Details

#__var(name) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 383

def __var name
  case context[1]
  when /_pat$/ then
    "^#{name}"
  when :in then
    "^#{name}"
  else
    name.to_s
  end
end

#comments(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 353

def comments exp # :nodoc:
  comments = exp.comments
  comments += "\n" unless comments.end_with?("\n") if comments
  comments
end

#cond_loop(exp, name) ⇒ Object

Generate a post-or-pre conditional loop.



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# File 'lib/ruby2ruby.rb', line 1322

def cond_loop(exp, name)
  _, cond, body, head_controlled = exp

  cond = process cond
  body = process body

  body = indent(body).chomp if body

  code = []
  if head_controlled then
    code << "#{name} #{cond} do"
    code << body if body
    code << "end"
  else
    code << "begin"
    code << body if body
    code << "end #{name} #{cond}"
  end

  code.join("\n")
end

#dthing_escape(type, lit) ⇒ Object

Utility method to escape something interpolated.



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# File 'lib/ruby2ruby.rb', line 1347

def dthing_escape type, lit
  # TODO: this needs more testing
  case type
  when :dregx then
    lit.gsub(/(\A|[^\\])\//, '\1\/')
  when :dstr, :dsym then
    lit.dump[1..-2]
  when :dxstr then
    lit.gsub(/`/, '\`')
  else
    raise "unsupported type #{type.inspect}"
  end
end

#indent(s) ⇒ Object

Indent all lines of s to the current indent level.



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# File 'lib/ruby2ruby.rb', line 1364

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

#parenthesize(exp) ⇒ Object

Wrap appropriate expressions in matching parens.



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# File 'lib/ruby2ruby.rb', line 1371

def parenthesize exp
  case context[1]
  when nil, :defn, :defs, :class, :sclass, :if, :iter, :resbody, :when, :while then
    exp
  else
    "(#{exp})"
  end
end

#process_alias(exp) ⇒ Object

Processors



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# File 'lib/ruby2ruby.rb', line 97

def process_alias exp # :nodoc:
  _, lhs, rhs = exp

  parenthesize "alias #{process lhs} #{process rhs}"
end

#process_and(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 103

def process_and exp # :nodoc:
  _, lhs, rhs = exp

  parenthesize "#{process lhs} and #{process rhs}"
end

#process_arglist(exp) ⇒ Object

custom made node # :nodoc:



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# File 'lib/ruby2ruby.rb', line 109

def process_arglist exp # custom made node # :nodoc:
  _, *args = exp

  args.map { |arg|
    code = process arg
    arg.sexp_type == :rescue ? "(#{code})" : code
  }.join ", "
end

#process_args(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 118

def process_args exp # :nodoc:
  _, *args = exp

  shadow = []

  args = args.map { |arg|
    case arg
    when Symbol then
      arg
    when Sexp then
      case arg.sexp_type
      when :lasgn then
        process(arg)
      when :masgn then
        process(arg)
      when :kwarg then
        _, k, v = arg
        "#{k}: #{process v}"
      when :shadow then
        shadow << arg.sexp_body
        next
      when :forward_args then
        "..."
      else
        raise "unknown arg type #{arg.first.inspect}"
      end
    when nil then
      ""
    else
      raise "unknown arg type #{arg.inspect}"
    end
  }.compact

  args   = args.join(", ").strip
  shadow = shadow.join(", ").strip
  shadow = "; #{shadow}" unless shadow.empty?

  "(%s%s)" % [args, shadow]
end

#process_array(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 158

def process_array exp # :nodoc:
  "[#{process_arglist exp}]"
end

#process_array_pat(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 627

def process_array_pat exp # :nodoc:
  _, const, *rest = exp

  const = process const if const

  rest = rest.map { |sexp|
    case sexp
    when Sexp
      process sexp
    else
      sexp
    end
  }

  "%s[%s]" % [const, rest.join(", ")]
end

#process_attrasgn(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 162

def process_attrasgn exp # :nodoc:
  _, recv, name, *args = exp

  rhs = args.pop
  args = s(:array, *args)
  receiver = process recv

  case name
  when :[]= then
    args = process args
    "#{receiver}#{args} = #{process rhs}"
  else
    raise "dunno what to do: #{args.inspect}" if args.size != 1 # s(:array)
    name = name.to_s.chomp "="
    if rhs && rhs != s(:arglist) then
      "#{receiver}.#{name} = #{process(rhs)}"
    else
      raise "dunno what to do: #{rhs.inspect}"
    end
  end
end

#process_back_ref(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 184

def process_back_ref exp # :nodoc:
  _, n = exp

  "$#{n}"
end

#process_begin(exp) ⇒ Object

TODO: figure out how to do rescue and ensure ENTIRELY w/o begin



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# File 'lib/ruby2ruby.rb', line 191

def process_begin exp # :nodoc:
  _, *rest = exp

  code = rest.map { |sexp|
    src = process sexp
    src = indent src unless src =~ /(^|\n)(rescue|ensure)/ # ensure no level 0 rescues
    src
  }
  code.unshift "begin"
  code.push "end"

  code.join "\n"
end

#process_block(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 205

def process_block exp # :nodoc:
  _, *body = exp

  result = body.map { |sexp|
    process sexp
  }

  result << "# do nothing\n" if result.empty?
  result = parenthesize result.join "\n"
  result += "\n" unless result.start_with? "("

  result
end

#process_block_pass(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 219

def process_block_pass exp # :nodoc:
  raise "huh?: #{exp.inspect}" if exp.size > 2

  _, sexp = exp

  "&#{process sexp}"
end

#process_break(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 227

def process_break exp # :nodoc:
  _, arg = exp

  val = process arg

  if val then
    "break #{val}"
  else
    "break"
  end
end

#process_call(exp, safe_call = false) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 239

def process_call(exp, safe_call = false) # :nodoc:
  _, recv, name, *args = exp

  receiver_node_type = recv && recv.sexp_type
  receiver = process recv
  receiver = "(#{receiver})" if ASSIGN_NODES.include? receiver_node_type

  # args = []

  # 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
    max = args.size - 1
    args = args.map.with_index { |arg, i|
      arg_type = arg.sexp_type
      is_empty_hash = arg == s(:hash)
      arg = process arg

      next if arg.empty?

      strip_hash = (arg_type == :hash and
                    not BINARY.include? name and
                    not is_empty_hash and
                    (i == max or args[i + 1].sexp_type == :splat))
      wrap_arg = Ruby2Ruby::ASSIGN_NODES.include? arg_type

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

      arg
    }.compact
  end

  case name
  when *BINARY then
    if safe_call
      "#{receiver}&.#{name}(#{args.join(", ")})"
    elsif args.length > 1
      "#{receiver}.#{name}(#{args.join(", ")})"
    else
      "(#{receiver} #{name} #{args.join(", ")})"
    end
  when :[] then
    receiver ||= "self"
    "#{receiver}[#{args.join(", ")}]"
  when :[]= then
    receiver ||= "self"
    rhs = args.pop
    "#{receiver}[#{args.join(", ")}] = #{rhs}"
  when :"!" then
    "(not #{receiver})"
  when :"-@" then
    "-#{receiver}"
  when :"+@" then
    "+#{receiver}"
  else
    args     = nil                    if args.empty?
    args     = "(#{args.join(", ")})" if args
    receiver = "#{receiver}."         if receiver and not safe_call
    receiver = "#{receiver}&."        if receiver and safe_call

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

#process_case(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 313

def process_case exp # :nodoc:
  _, expr, *rest = exp

  result = []

  expr = process expr

  result << if expr then
              "case #{expr}"
            else
              "case"
            end

  result.concat rest.map { |pt|
    if pt and %i[when in].include? pt.sexp_type
      "#{process pt}"
    else
      next unless pt
      code = indent process pt
      code = indent("# do nothing") if code =~ /^\s*$/
      "else\n#{code}"
    end
  }

  result << "end"

  result.compact.join "\n"
end

#process_cdecl(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 342

def process_cdecl exp # :nodoc:
  _, lhs, rhs = exp
  lhs = process lhs if Sexp === lhs
  if rhs then
    rhs = process rhs
    "#{lhs} = #{rhs}"
  else
    lhs.to_s
  end
end

#process_class(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 359

def process_class exp # :nodoc:
  "#{comments exp}class #{util_module_or_class(exp, true)}"
end

#process_colon2(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 363

def process_colon2 exp # :nodoc:
  _, lhs, rhs = exp

  "#{process lhs}::#{rhs}"
end

#process_colon3(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 369

def process_colon3 exp # :nodoc:
  _, rhs = exp

  "::#{rhs}"
end

#process_const(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 375

def process_const exp # :nodoc:
  _, name = exp

  name = process name if Sexp === name

  name.to_s
end

#process_cvar(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 394

def process_cvar exp # :nodoc:
  _, name = exp

  __var name
end

#process_cvasgn(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 400

def process_cvasgn exp # :nodoc:
  _, lhs, rhs = exp

  "#{lhs} = #{process rhs}"
end

#process_cvdecl(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 406

def process_cvdecl exp # :nodoc:
  _, lhs, rhs = exp

  "#{lhs} = #{process rhs}"
end

#process_defined(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 412

def process_defined exp # :nodoc:
  _, rhs = exp
  "defined? #{process rhs}"
end

#process_defn(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 417

def process_defn(exp) # :nodoc:
  _, name, args, *body = exp

  comm = comments exp
  args = process args
  args = "" if args == "()"

  body = s() if body == s(s(:nil)) # empty it out of a default nil expression

  # s(:defn, name, args, ivar|iasgn)
  case exp
  when s{ q(:defn, atom, t(:args), q(:ivar, atom)) } then # TODO: atom -> _
    _, ivar = body.first
    ivar = ivar.to_s[1..-1] # remove leading @
    reader = name.to_s
    return "attr_reader #{name.inspect}" if reader == ivar
  when s{ q(:defn, atom, t(:args), q(:iasgn, atom, q(:lvar, atom))) } then
    _, ivar, _val = body.first
    ivar = ivar.to_s[1..-1] # remove leading @
    reader = name.to_s.chomp "="
    return "attr_writer :#{reader}" if reader == ivar
  end

  body = body.map { |ssexp|
    process ssexp
  }

  simple = body.size <= 1

  body << "# do nothing" if body.empty?
  body = body.join("\n")
  body = body.lines.to_a[1..-2].join("\n") if
    simple && body =~ /^\Abegin/ && body =~ /^end\z/
  body = indent(body) unless simple && body =~ /(^|\n)rescue/

  "#{comm}def #{name}#{args}\n#{body}\nend".gsub(/\n\s*\n+/, "\n")
end

#process_defs(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 455

def process_defs exp # :nodoc:
  _, lhs, name, args, *body = exp
  var = [:self, :cvar, :dvar, :ivar, :gvar, :lvar].include? lhs.sexp_type

  lhs = process lhs
  lhs = "(#{lhs})" unless var

  name = "#{lhs}.#{name}"

  process_defn s(:defn, name, args, *body)
end

#process_dot2(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 467

def process_dot2(exp) # :nodoc:
  _, lhs, rhs = exp

  "(#{process lhs}..#{process rhs})"
end

#process_dot3(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 473

def process_dot3(exp) # :nodoc:
  _, lhs, rhs = exp

  "(#{process lhs}...#{process rhs})"
end

#process_dregx(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 479

def process_dregx exp # :nodoc:
  _, str, *rest = exp

  options = re_opt rest.pop if Integer === rest.last

  "/" + util_dthing(:dregx, s(:dregx, str, *rest)) << "/#{options}"
end

#process_dregx_once(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 487

def process_dregx_once(exp) # :nodoc:
  process_dregx(exp) + "o"
end

#process_dstr(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 491

def process_dstr(exp) # :nodoc:
  "\"#{util_dthing(:dstr, exp)}\""
end

#process_dsym(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 495

def process_dsym(exp) # :nodoc:
  ":\"#{util_dthing(:dsym, exp)}\""
end

#process_dxstr(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 499

def process_dxstr(exp) # :nodoc:
  "`#{util_dthing(:dxstr, exp)}`"
end

#process_ensure(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 503

def process_ensure(exp) # :nodoc:
  _, body, ens = exp

  body = process body
  ens  = nil if ens == s(:nil)
  ens  = process(ens) || "# do nothing"
  ens = "begin\n#{ens}\nend\n" if ens =~ /(^|\n)rescue/

  body = body.sub(/\n\s*end\z/, "")
  body = indent(body) unless body =~ /(^|\n)rescue/

  "#{body}\nensure\n#{indent ens}"
end

#process_evstr(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 517

def process_evstr exp # :nodoc:
  _, x = exp

  x ? process(x) : ""
end

#process_false(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 523

def process_false exp # :nodoc:
  "false"
end

#process_find_pat(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 616

def process_find_pat exp # :nodoc:
  _, a, b, *c, d = exp

    a = process a               # might be nil
    b = process b if Sexp === b
    c = c.map { |sexp| process sexp }.join(", ")
    d = process d if Sexp === d

    "%s[%s, %s, %s]" % [a, b, c, d]
end

#process_flip2(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 527

def process_flip2 exp # :nodoc:
  _, lhs, rhs = exp

  "#{process lhs}..#{process rhs}"
end

#process_flip3(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 533

def process_flip3 exp # :nodoc:
  _, lhs, rhs = exp

  "#{process lhs}...#{process rhs}"
end

#process_for(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 539

def process_for exp # :nodoc:
  _, recv, iter, body = exp

  recv = process recv
  iter = process iter
  body = process(body) || "# do nothing"

  result = ["for #{iter} in #{recv} do"]
  result << indent(body)
  result << "end"

  result.join "\n"
end

#process_forward_args(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 553

def process_forward_args exp
  "..."
end

#process_gasgn(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 557

def process_gasgn exp # :nodoc:
  process_iasgn exp
end

#process_gvar(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 561

def process_gvar exp # :nodoc:
  _, name = exp

  __var name
end

#process_hash(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 567

def process_hash(exp) # :nodoc:
  _, *pairs = exp

  result = pairs.each_slice(2).map { |k, v|
    if k.sexp_type == :kwsplat then
      "%s" % process(k)
    elsif v.nil?
      # Shorthand hash syntax
      unless k.sexp_type == :lit and k.value.is_a? Symbol
        raise "Expected symbol for hash key, but got #{k.inspect}"
      end

      "#{k.value}:"
    else
      t = v.sexp_type

      lhs = process k
      rhs = process v
      rhs = "(#{rhs})" unless HASH_VAL_NO_PAREN.include? t

      "%s => %s" % [lhs, rhs]
    end
  }

  result.empty? ? "{}" : "{ #{result.join(", ")} }"
end

#process_hash_pat(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 650

def process_hash_pat exp # :nodoc:
  _, const, *rest = exp

  if const then
    const = process const
    kwrest = process rest.pop if rest.last && rest.last.sexp_type == :kwrest

    rest = rest.each_slice(2).map { |k, v|
      k = process(k).delete_prefix ":"
      v = process v

      "#{k}: #{v}".strip
    }

    rest << kwrest if kwrest

    rest.empty? ? "%s[]" % const : "%s[%s]" % [const, rest.join(", ")]
  else
    kwrest = process rest.pop if rest.last && rest.last.sexp_type == :kwrest

    rest = rest.each_slice(2).map { |k, v|
      k = process(k).delete_prefix ":"
      v = process v

      "#{k}: #{v}".strip
    }

    rest << kwrest if kwrest

    rest.empty? ? "{}" : "{ %s }" % [rest.join(", ")]
  end
end

#process_iasgn(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 594

def process_iasgn(exp) # :nodoc:
  _, lhs, rhs = exp

  if rhs then
    "#{lhs} = #{process rhs}"
  else # part of an masgn
    lhs.to_s
  end
end

#process_if(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 687

def process_if(exp) # :nodoc:
  _, c, t, f = exp

  expand = Ruby2Ruby::ASSIGN_NODES.include? c.sexp_type
  c = process c
  t = process t
  f = process f

  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 = []
    r << "if #{c} then\n#{indent(t)}\n"
    r << "else\n#{indent(f)}\n" if f
    r << "end"

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

#process_in(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 604

def process_in exp # :nodoc:
  _, lhs, *rhs = exp

  cond = process lhs
  body = rhs.compact.map { |sexp| indent process sexp }

  body << indent("# do nothing") if body.empty?
  body = body.join "\n"

  "in #{cond} then\n#{body.chomp}"
end

#process_iter(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 732

def process_iter(exp) # :nodoc:
  _, iter, args, body = exp

  is_lambda = iter.sexp_type == :lambda

  iter = process iter
  body = process body if body

  args = case
         when args == 0 then
           ""
         when is_lambda then
           " (#{process(args)[1..-2]})"
         else
           " |#{process(args)[1..-2]}|"
         end

  b, e = if MUST_BE_CURLY.include? iter then
           %w[ { } ]
         else
           %w[ do end ]
         end

  iter = iter.sub(/\(\)$/, "")

  # REFACTOR: ugh
  result = []
  if is_lambda then
    result << iter
    result << args
    result << " {"
  else
    result << "#{iter} {"
    result << args
  end
  result << if body then
              " #{body.strip} "
            else
              " "
            end
  result << "}"
  result = result.join
  return result if result !~ /\n/ and result.size < LINE_LENGTH

  result = []

  if is_lambda then
    result << iter
    result << args
    result << " #{b}"
  else
    result << "#{iter} #{b}"
    result << args
  end

  result << "\n"
  if body then
    result << indent(body.strip)
    result << "\n"
  end
  result << e
  result.join
end

#process_ivar(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 796

def process_ivar(exp) # :nodoc:
  _, name = exp

  __var name
end

#process_kwrest(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 644

def process_kwrest exp # :nodoc:
  _, name = exp

  name.to_s
end

#process_kwsplat(exp) ⇒ Object 



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# File 'lib/ruby2ruby.rb', line 802

def process_kwsplat(exp)
  _, kw = exp
  "**#{process kw}"
end

#process_lambda(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 726

def process_lambda exp # :nodoc:
  "->"
end

#process_lasgn(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 807

def process_lasgn(exp) # :nodoc:
  _, name, value = exp

  value = process value

  if value then
    "%s %s %s" % case context[1]
                 when /_pat$/ then
                   [value, "=>", name]
                 else
                   [name, "=", value]
                 end
  else
    "%s" % [name]
  end
end

#process_lit(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 824

def process_lit exp # :nodoc:
  _, obj = exp
  case obj
  when Range then
    "(#{obj.inspect})"
  else
    obj.inspect
  end
end

#process_lvar(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 834

def process_lvar(exp) # :nodoc:
  _, name = exp

  __var name
end

#process_masgn(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 840

def process_masgn(exp) # :nodoc:
  # s(:masgn, s(:array, s(:lasgn, :var), ...), s(:to_ary, <val>, ...))
  # s(:iter, <call>, s(:args, s(:masgn, :a, :b)), <body>)
  parenthesize = true

  result = exp.sexp_body.map { |sexp|
    case sexp
    when Sexp then
      if sexp.sexp_type == :array then
        parenthesize = context.grep(:masgn).size > 1
        res = process sexp

        res[1..-2]
      else
        process sexp
      end
    when Symbol then
      sexp
    else
      raise "unknown masgn: #{sexp.inspect}"
    end
  }
  parenthesize ? "(#{result.join ", "})" : result.join(" = ")
end

#process_match(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 865

def process_match exp # :nodoc:
  _, rhs = exp

  "#{process rhs}"
end

#process_match2(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 871

def process_match2 exp # :nodoc:
  # s(:match2, s(:lit, /x/), s(:str, "blah"))
  _, lhs, rhs = exp

  lhs = process lhs
  rhs = process rhs

  "#{lhs} =~ #{rhs}"
end

#process_match3(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 881

def process_match3 exp # :nodoc:
  _, rhs, lhs = exp # yes, backwards

  left_type = lhs.sexp_type
  lhs = process lhs
  rhs = process rhs

  if ASSIGN_NODES.include? left_type then
    "(#{lhs}) =~ #{rhs}"
  else
    "#{lhs} =~ #{rhs}"
  end
end

#process_module(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 895

def process_module(exp) # :nodoc:
  "#{comments exp}module #{util_module_or_class(exp)}"
end

#process_next(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 899

def process_next(exp) # :nodoc:
  _, rhs = exp

  val = rhs && process(rhs) # maybe push down into if and test rhs?
  if val then
    "next #{val}"
  else
    "next"
  end
end

#process_nil(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 910

def process_nil(exp) # :nodoc:
  "nil"
end

#process_not(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 914

def process_not(exp) # :nodoc:
  _, sexp = exp
  "(not #{process sexp})"
end

#process_nth_ref(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 919

def process_nth_ref(exp) # :nodoc:
  _, n = exp
  "$#{n}"
end

#process_op_asgn(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 924

def process_op_asgn exp # :nodoc:
  case exp.length
  when 4
    _, lhs, op, rhs = exp

    lhs = process lhs
    rhs = process rhs

    "#{lhs} #{op}= #{rhs}"
  when 5
    _, lhs, rhs, index, op = exp

    lhs = process lhs
    rhs = process rhs

    "#{lhs}.#{index} #{op}= #{rhs}"
  else
    raise ArgumentError, "Don't know how to process this length: %p" % [exp]
  end
end

#process_op_asgn1(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 945

def process_op_asgn1(exp) # :nodoc:
  # [[:lvar, :b], [:arglist, [:lit, 1]], :"||", [:lit, 10]]
  _, lhs, index, msg, rhs = exp

  lhs   = process lhs
  index = process index
  rhs   = process rhs

  "#{lhs}[#{index}] #{msg}= #{rhs}"
end

#process_op_asgn2(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 956

def process_op_asgn2 exp # :nodoc:
  # [[:lvar, :c], :var=, :"||", [:lit, 20]]
  _, lhs, index, msg, rhs = exp

  lhs   = process lhs
  index = index.to_s[0..-2]
  rhs   = process rhs

  "#{lhs}.#{index} #{msg}= #{rhs}"
end

#process_op_asgn_and(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 967

def process_op_asgn_and(exp) # :nodoc:
  # a &&= 1
  # [[:lvar, :a], [:lasgn, :a, [:lit, 1]]]
  _, _lhs, rhs = exp
  process(rhs).sub(/\=/, "&&=")
end

#process_op_asgn_or(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 974

def process_op_asgn_or(exp) # :nodoc:
  # a ||= 1
  # [[:lvar, :a], [:lasgn, :a, [:lit, 1]]]
  _, _lhs, rhs = exp
  process(rhs).sub(/\=/, "||=")
end

#process_or(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 981

def process_or(exp) # :nodoc:
  _, lhs, rhs = exp

  lhs = process lhs
  rhs = process rhs

  case context[1]
  when :in then
    "(#{lhs} | #{rhs})"
  else
    "(#{lhs} or #{rhs})"
  end
end

#process_postexe(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 995

def process_postexe(exp) # :nodoc:
  "END"
end

#process_preexe(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 683

def process_preexe exp # :nodoc:
  "BEGIN"
end

#process_redo(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 999

def process_redo(exp) # :nodoc:
  "redo"
end

#process_resbody(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1003

def process_resbody exp # :nodoc:
  # s(:resbody, s(:array), s(:return, s(:str, "a")))
  _, args, *body = exp

  body = body.compact.map { |sexp|
    process sexp
  }

  body << "# do nothing" if body.empty?

  name =   args.lasgn true
  name ||= args.iasgn true
  args = process(args)[1..-2]
  args = " #{args}" unless args.empty?
  args += " => #{name[1]}" if name

  "rescue#{args}\n#{indent body.join("\n")}"
end

#process_rescue(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1022

def process_rescue exp # :nodoc:
  _, *rest = exp

  body = process rest.shift unless rest.first.sexp_type == :resbody
  els  = process rest.pop   unless rest.last && rest.last.sexp_type == :resbody

  body ||= "# do nothing"

  # TODO: I don't like this using method_missing, but I need to ensure tests
  simple = rest.size == 1 && rest.first.size <= 3 &&
    !rest.first.block &&
    !rest.first.return

  resbodies = rest.map { |resbody|
    _, rb_args, rb_body, *rb_rest = resbody
    simple &&= rb_args == s(:array)
    simple &&= rb_rest.empty? && rb_body && rb_body.node_type != :block
    process resbody
  }

  if els then
    "#{indent body}\n#{resbodies.join("\n")}\nelse\n#{indent els}"
  elsif simple then
    resbody = resbodies.first.sub(/\n\s*/, " ")
    "#{body} #{resbody}"
  else
    "#{indent body}\n#{resbodies.join("\n")}"
  end
end

#process_retry(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1052

def process_retry(exp) # :nodoc:
  "retry"
end

#process_return(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1056

def process_return exp # :nodoc:
  _, rhs = exp

  unless rhs then
    "return"
  else
    rhs_type = rhs.sexp_type
    rhs = process rhs
    rhs = "(#{rhs})" if ASSIGN_NODES.include? rhs_type
    "return #{rhs}"
  end
end

#process_safe_attrasgn(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1069

def process_safe_attrasgn exp # :nodoc:
  _, receiver, name, *rest = exp

  receiver = process receiver
  rhs  = rest.pop
  args = rest.pop # should be nil

  raise "dunno what to do: #{args.inspect}" if args

  name = name.to_s.sub(/=$/, "")

  if rhs && rhs != s(:arglist) then
    "#{receiver}&.#{name} = #{process rhs}"
  else
    raise "dunno what to do: #{rhs.inspect}"
  end
end

#process_safe_call(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 309

def process_safe_call exp # :nodoc:
  process_call exp, :safe
end

#process_safe_op_asgn(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1087

def process_safe_op_asgn exp # :nodoc:
  # [[:lvar, :x], [:call, nil, :z, [:lit, 1]], :y, :"||"]
  _, lhs, rhs, index, op = exp

  lhs = process lhs
  rhs = process rhs

  "#{lhs}&.#{index} #{op}= #{rhs}"
end

#process_safe_op_asgn2(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1097

def process_safe_op_asgn2(exp) # :nodoc:
  # [[:lvar, :c], :var=, :"||", [:lit, 20]]

  _, lhs, index, msg, rhs = exp

  lhs   = process lhs
  index = index.to_s[0..-2]
  rhs   = process rhs

  "#{lhs}&.#{index} #{msg}= #{rhs}"
end

#process_sclass(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1109

def process_sclass(exp) # :nodoc:
  _, recv, *block = exp

  recv = process recv
  block = indent process_block s(:block, *block)

  "class << #{recv}\n#{block}\nend"
end

#process_self(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1118

def process_self(exp) # :nodoc:
  "self"
end

#process_splat(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1122

def process_splat(exp) # :nodoc:
  _, arg = exp
  if arg.nil? then
    "*"
  else
    "*#{process arg}"
  end
end

#process_str(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1131

def process_str(exp) # :nodoc:
  _, s = exp
  s.dump
end

#process_super(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1136

def process_super(exp) # :nodoc:
  _, *args = exp

  args = args.map { |arg|
    process arg
  }

  "super(#{args.join ", "})"
end

#process_svalue(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1146

def process_svalue(exp) # :nodoc:
  _, *args = exp

  args.map { |arg|
    process arg
  }.join ", "
end

#process_to_ary(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1154

def process_to_ary exp # :nodoc:
  _, sexp = exp

  process sexp
end

#process_true(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1160

def process_true(exp) # :nodoc:
  "true"
end

#process_undef(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1164

def process_undef(exp) # :nodoc:
  _, name = exp

  "undef #{process name}"
end

#process_until(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1170

def process_until(exp) # :nodoc:
  cond_loop(exp, "until")
end

#process_valias(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1174

def process_valias exp # :nodoc:
  _, lhs, rhs = exp

  "alias #{lhs} #{rhs}"
end

#process_when(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1180

def process_when exp # :nodoc:
  _, lhs, *rhs = exp

  cond = process(lhs)[1..-2]

  rhs = rhs.compact.map { |sexp|
    indent process sexp
  }

  rhs << indent("# do nothing") if rhs.empty?
  rhs = rhs.join "\n"

  "when #{cond} then\n#{rhs.chomp}"
end

#process_while(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1195

def process_while(exp) # :nodoc:
  cond_loop exp, "while"
end

#process_xstr(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1199

def process_xstr(exp) # :nodoc:
  "`#{process_str(exp)[1..-2]}`"
end

#process_yield(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1203

def process_yield(exp) # :nodoc:
  _, *args = exp

  args = args.map { |arg|
    process arg
  }

  unless args.empty? then
    "yield(#{args.join(", ")})"
  else
    "yield"
  end
end

#process_zsuper(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1217

def process_zsuper(exp) # :nodoc:
  "super"
end

#re_opt(options) ⇒ Object

Return the appropriate regexp flags for a given numeric code.



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# File 'lib/ruby2ruby.rb', line 1383

def re_opt options
  bits = (0..8).map { |n| options[n] * 2**n }
  bits.delete 0
  bits.map { |n| Regexp::CODES[n] }.join
end

#rewrite_attrasgn(exp) ⇒ Object

Rewriters:



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# File 'lib/ruby2ruby.rb', line 1224

def rewrite_attrasgn exp # :nodoc:
  if context.first(2) == [:array, :masgn] then
    _, recv, msg, *args = exp

    exp = s(:call, recv, msg.to_s.chomp("=").to_sym, *args)
  end

  exp
end

#rewrite_call(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1234

def rewrite_call exp # :nodoc:
  _, recv, msg, *args = exp

  exp = s(:not, recv) if msg == :! && args.empty?

  exp
end

#rewrite_ensure(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1242

def rewrite_ensure exp # :nodoc:
  exp = s(:begin, exp) unless context.first == :begin
  exp
end

#rewrite_if(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1247

def rewrite_if exp # :nodoc:
  _, c, t, f = exp

  if c.sexp_type == :not then
    _, nc = c
    exp = s(:if, nc, f, t)
  end

  exp
end

#rewrite_resbody(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1258

def rewrite_resbody exp # :nodoc:
  _, args, *_rest = exp
  raise "no exception list in #{exp.inspect}" unless exp.size > 2 && args
  raise args.inspect if args.sexp_type != :array
  # for now, do nothing, just check and freak if we see an errant structure
  exp
end

#rewrite_rescue(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1266

def rewrite_rescue exp # :nodoc:
  complex = false
  complex ||= exp.size > 3
  complex ||= exp.resbody.block
  complex ||= exp.resbody.size > 3
  resbodies = exp.find_nodes(:resbody)
  complex ||= resbodies.any? { |n| n[1] != s(:array) }
  complex ||= resbodies.any? { |n| n.last.nil? }
  complex ||= resbodies.any? { |(_, _, body)| body and body.node_type == :block }

  handled = context.first == :ensure

  exp = s(:begin, exp) if complex unless handled

  exp
end

#rewrite_svalue(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1283

def rewrite_svalue(exp) # :nodoc:
  case exp.last.sexp_type
  when :array
    s(:svalue, *exp[1].sexp_body)
  when :splat
    exp
  else
    raise "huh: #{exp.inspect}"
  end
end

#rewrite_until(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1294

def rewrite_until exp # :nodoc:
  _, c, *body = exp

  if c.sexp_type == :not then
    _, nc = c
    exp = s(:while, nc, *body)
  end

  exp
end

#rewrite_while(exp) ⇒ Object

:nodoc:



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# File 'lib/ruby2ruby.rb', line 1305

def rewrite_while exp # :nodoc:
  _, c, *body = exp

  if c.sexp_type == :not then
    _, nc = c
    exp = s(:until, nc, *body)
  end

  exp
end

#splat(sym) ⇒ Object

Return a splatted symbol for sym.



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# File 'lib/ruby2ruby.rb', line 1392

def splat(sym)
  :"*#{sym}"
end

#util_dthing(type, exp) ⇒ Object

Utility method to generate something interpolated.



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# File 'lib/ruby2ruby.rb', line 1399

def util_dthing(type, exp)
  _, str, *rest = exp

  # first item in sexp is a string literal
  str = dthing_escape(type, str)

  rest = rest.map { |pt|
    case pt.sexp_type
    when :str then
      dthing_escape(type, pt.last)
    when :evstr then
      '#{%s}' % [process(pt)]
    else
      raise "unknown type: #{pt.inspect}"
    end
  }

  [str, rest].join
end

#util_module_or_class(exp, is_class = false) ⇒ Object

Utility method to generate ether a module or class.



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# File 'lib/ruby2ruby.rb', line 1422

def util_module_or_class exp, is_class = false
  result = []

  _, name, *body = exp
  superk = body.shift if is_class

  name = process name if Sexp === name

  result << name

  if superk then
    superk = process superk
    result << " < #{superk}" if superk
  end

  result << "\n"

  body = body.map { |sexp|
    process(sexp).chomp
  }

  body = unless body.empty? then
           indent(body.join("\n\n")) + "\n"
         else
           ""
         end

  result << body
  result << "end"

  result.join
end