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ruby2ruby.rb
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ruby2ruby.rb
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#!/usr/bin/env ruby -w
require "rubygems"
require "sexp_processor"
# :stopdoc:
# REFACTOR: stolen from ruby_parser
class Regexp
unless defined? ENC_NONE then
ENC_NONE = /x/n.options
ENC_EUC = /x/e.options
ENC_SJIS = /x/s.options
ENC_UTF8 = /x/u.options
end
unless defined? CODES then
CODES = {
EXTENDED => "x",
IGNORECASE => "i",
MULTILINE => "m",
ENC_NONE => "n",
ENC_EUC => "e",
ENC_SJIS => "s",
ENC_UTF8 => "u",
}
end
end
# :startdoc:
##
# Generate ruby code from a sexp.
class Ruby2Ruby < SexpProcessor
VERSION = "2.5.0" # :nodoc:
# cutoff for one-liners
LINE_LENGTH = 78
# binary operation messages
BINARY = [:<=>, :==, :<, :>, :<=, :>=, :-, :+, :*, :/, :%, :<<, :>>, :**, :"!=", :^, :|, :&]
##
# Nodes that represent assignment and probably need () around them.
#
# TODO: this should be replaced with full precedence support :/
ASSIGN_NODES = [
:dasgn,
:flip2,
:flip3,
:lasgn,
:masgn,
:match3,
:attrasgn,
:op_asgn1,
:op_asgn2,
:op_asgn_and,
:op_asgn_or,
:return,
:if, # HACK
:rescue,
]
##
# 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
HASH_VAL_NO_PAREN = [
:call,
:false,
:lit,
:lvar,
:nil,
:str,
:true,
]
def initialize # :nodoc:
super
@indent = " "
self.require_empty = false
self.strict = true
self.expected = String
@calls = []
# self.debug[:defn] = /zsuper/
end
############################################################
# Processors
def process_alias exp # :nodoc:
_, lhs, rhs = exp
parenthesize "alias #{process lhs} #{process rhs}"
end
def process_and exp # :nodoc:
_, lhs, rhs = exp
parenthesize "#{process lhs} and #{process rhs}"
end
def process_arglist exp # custom made node # :nodoc:
_, *args = exp
args.map { |arg|
code = process arg
arg.sexp_type == :rescue ? "(#{code})" : code
}.join ", "
end
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
def process_array exp # :nodoc:
"[#{process_arglist exp}]"
end
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
def process_back_ref exp # :nodoc:
_, n = exp
"$#{n}"
end
# TODO: figure out how to do rescue and ensure ENTIRELY w/o begin
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
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
def process_block_pass exp # :nodoc:
raise "huh?: #{exp.inspect}" if exp.size > 2
_, sexp = exp
"&#{process sexp}"
end
def process_break exp # :nodoc:
_, arg = exp
val = process arg
if val then
"break #{val}"
else
"break"
end
end
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
def process_safe_call exp # :nodoc:
process_call exp, :safe
end
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
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
def process_class exp # :nodoc:
"#{exp.comments}class #{util_module_or_class(exp, true)}"
end
def process_colon2 exp # :nodoc:
_, lhs, rhs = exp
"#{process lhs}::#{rhs}"
end
def process_colon3 exp # :nodoc:
_, rhs = exp
"::#{rhs}"
end
def process_const exp # :nodoc:
_, name = exp
name = process name if Sexp === name
name.to_s
end
def __var name
case context[1]
when /_pat$/ then
"^#{name}"
when :in then
"^#{name}"
else
name.to_s
end
end
def process_cvar exp # :nodoc:
_, name = exp
__var name
end
def process_cvasgn exp # :nodoc:
_, lhs, rhs = exp
"#{lhs} = #{process rhs}"
end
def process_cvdecl exp # :nodoc:
_, lhs, rhs = exp
"#{lhs} = #{process rhs}"
end
def process_defined exp # :nodoc:
_, rhs = exp
"defined? #{process rhs}"
end
def process_defn(exp) # :nodoc:
_, name, args, *body = exp
comm = exp.comments
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
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
def process_dot2(exp) # :nodoc:
_, lhs, rhs = exp
"(#{process lhs}..#{process rhs})"
end
def process_dot3(exp) # :nodoc:
_, lhs, rhs = exp
"(#{process lhs}...#{process rhs})"
end
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
def process_dregx_once(exp) # :nodoc:
process_dregx(exp) + "o"
end
def process_dstr(exp) # :nodoc:
"\"#{util_dthing(:dstr, exp)}\""
end
def process_dsym(exp) # :nodoc:
":\"#{util_dthing(:dsym, exp)}\""
end
def process_dxstr(exp) # :nodoc:
"`#{util_dthing(:dxstr, exp)}`"
end
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.sub!(/\n\s*end\z/, "")
body = indent(body) unless body =~ /(^|\n)rescue/
"#{body}\nensure\n#{indent ens}"
end
def process_evstr exp # :nodoc:
_, x = exp
x ? process(x) : ""
end
def process_false exp # :nodoc:
"false"
end
def process_flip2 exp # :nodoc:
_, lhs, rhs = exp
"#{process lhs}..#{process rhs}"
end
def process_flip3 exp # :nodoc:
_, lhs, rhs = exp
"#{process lhs}...#{process rhs}"
end
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
def process_forward_args exp
"..."
end
def process_gasgn exp # :nodoc:
process_iasgn exp
end
def process_gvar exp # :nodoc:
_, name = exp
__var name
end
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
def process_iasgn(exp) # :nodoc:
_, lhs, rhs = exp
if rhs then
"#{lhs} = #{process rhs}"
else # part of an masgn
lhs.to_s
end
end
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
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
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
def process_kwrest exp # :nodoc:
_, name = exp
name.to_s
end
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
def process_preexe exp # :nodoc:
"BEGIN"
end
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 = "if #{c} then\n#{indent(t)}\n"
r << "else\n#{indent(f)}\n" if f
r << "end"
r
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
def process_lambda exp # :nodoc:
"->"
end
MUST_BE_CURLY = %w[ BEGIN END ]
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.sub!(/\(\)$/, "")
# REFACTOR: ugh
result = []
if is_lambda then
result << iter
result << args
result << " {"
else
result << "#{iter} {"
result << args
end
result << if body then
" #{body.strip} "
else
" "
end
result << "}"
result = result.join
return result if result !~ /\n/ and result.size < LINE_LENGTH
result = []
if is_lambda then
result << iter
result << args
result << " #{b}"
else
result << "#{iter} #{b}"
result << args
end
result << "\n"
if body then
result << indent(body.strip)
result << "\n"
end
result << e
result.join
end
def process_ivar(exp) # :nodoc:
_, name = exp
__var name
end
def process_kwsplat(exp)
_, kw = exp
"**#{process kw}"
end
def process_lasgn(exp) # :nodoc:
_, name, value = exp
value = process value
if value then
"%s %s %s" % case context[1]
when /_pat$/ then
[value, "=>", name]
else
[name, "=", value]
end
else
"%s" % [name]
end
end
def process_lit exp # :nodoc:
_, obj = exp
case obj
when Range then
"(#{obj.inspect})"
else
obj.inspect
end
end
def process_lvar(exp) # :nodoc:
_, name = exp
__var name
end
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
def process_match exp # :nodoc:
_, rhs = exp
"#{process rhs}"
end
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
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
def process_module(exp) # :nodoc:
"#{exp.comments}module #{util_module_or_class(exp)}"
end
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
def process_nil(exp) # :nodoc:
"nil"
end
def process_not(exp) # :nodoc:
_, sexp = exp
"(not #{process sexp})"
end
def process_nth_ref(exp) # :nodoc:
_, n = exp
"$#{n}"
end
def process_op_asgn exp # :nodoc:
# [[:lvar, :x], [:call, nil, :z, [:lit, 1]], :y, :"||"]
case exp.length
when 4
raise "NOT YET: op_asgn 4"
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
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
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
def process_op_asgn_and(exp) # :nodoc:
# a &&= 1
# [[:lvar, :a], [:lasgn, :a, [:lit, 1]]]
_, _lhs, rhs = exp
process(rhs).sub(/\=/, "&&=")
end
def process_op_asgn_or(exp) # :nodoc:
# a ||= 1
# [[:lvar, :a], [:lasgn, :a, [:lit, 1]]]
_, _lhs, rhs = exp
process(rhs).sub(/\=/, "||=")
end
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
def process_postexe(exp) # :nodoc:
"END"
end
def process_redo(exp) # :nodoc:
"redo"
end
def process_resbody exp # :nodoc:
# s(:resbody, s(:array), s(:return, s(:str, "a")))
_, args, *body = exp
body = body.compact.map { |sexp|
process sexp
}