Current File : //opt/alt/ruby26/lib64/ruby/2.6.0/ripper/sexp.rb
# frozen_string_literal: true
#
# $Id: sexp.rb 59246 2017-07-01 02:01:05Z nobu $
#
# Copyright (c) 2004,2005 Minero Aoki
#
# This program is free software.
# You can distribute and/or modify this program under the Ruby License.
# For details of Ruby License, see ruby/COPYING.
#
require 'ripper/core'
class Ripper
# [EXPERIMENTAL]
# Parses +src+ and create S-exp tree.
# Returns more readable tree rather than Ripper.sexp_raw.
# This method is mainly for developer use.
#
# require 'ripper'
# require 'pp'
#
# pp Ripper.sexp("def m(a) nil end")
# #=> [:program,
# [[:def,
# [:@ident, "m", [1, 4]],
# [:paren, [:params, [[:@ident, "a", [1, 6]]], nil, nil, nil, nil]],
# [:bodystmt, [[:var_ref, [:@kw, "nil", [1, 9]]]], nil, nil, nil]]]]
#
def Ripper.sexp(src, filename = '-', lineno = 1)
builder = SexpBuilderPP.new(src, filename, lineno)
sexp = builder.parse
sexp unless builder.error?
end
# [EXPERIMENTAL]
# Parses +src+ and create S-exp tree.
# This method is mainly for developer use.
#
# require 'ripper'
# require 'pp'
#
# pp Ripper.sexp_raw("def m(a) nil end")
# #=> [:program,
# [:stmts_add,
# [:stmts_new],
# [:def,
# [:@ident, "m", [1, 4]],
# [:paren, [:params, [[:@ident, "a", [1, 6]]], nil, nil, nil]],
# [:bodystmt,
# [:stmts_add, [:stmts_new], [:var_ref, [:@kw, "nil", [1, 9]]]],
# nil,
# nil,
# nil]]]]
#
def Ripper.sexp_raw(src, filename = '-', lineno = 1)
builder = SexpBuilder.new(src, filename, lineno)
sexp = builder.parse
sexp unless builder.error?
end
class SexpBuilder < ::Ripper #:nodoc:
private
def dedent_element(e, width)
if (n = dedent_string(e[1], width)) > 0
e[2][1] += n
end
e
end
def on_heredoc_dedent(val, width)
sub = proc do |cont|
cont.map! do |e|
if Array === e
case e[0]
when :@tstring_content
e = dedent_element(e, width)
when /_add\z/
e[1] = sub[e[1]]
end
elsif String === e
dedent_string(e, width)
end
e
end
end
sub[val]
val
end
events = private_instance_methods(false).grep(/\Aon_/) {$'.to_sym}
(PARSER_EVENTS - events).each do |event|
module_eval(<<-End, __FILE__, __LINE__ + 1)
def on_#{event}(*args)
args.unshift :#{event}
args
end
End
end
SCANNER_EVENTS.each do |event|
module_eval(<<-End, __FILE__, __LINE__ + 1)
def on_#{event}(tok)
[:@#{event}, tok, [lineno(), column()]]
end
End
end
end
class SexpBuilderPP < SexpBuilder #:nodoc:
private
def on_heredoc_dedent(val, width)
val.map! do |e|
next e if Symbol === e and /_content\z/ =~ e
if Array === e and e[0] == :@tstring_content
e = dedent_element(e, width)
elsif String === e
dedent_string(e, width)
end
e
end
val
end
def _dispatch_event_new
[]
end
def _dispatch_event_push(list, item)
list.push item
list
end
def on_mlhs_paren(list)
[:mlhs, *list]
end
def on_mlhs_add_star(list, star)
list.push([:rest_param, star])
end
def on_mlhs_add_post(list, post)
list.concat(post)
end
PARSER_EVENT_TABLE.each do |event, arity|
if /_new\z/ =~ event and arity == 0
alias_method "on_#{event}", :_dispatch_event_new
elsif /_add\z/ =~ event
alias_method "on_#{event}", :_dispatch_event_push
end
end
end
end