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#
# $Id: sexp.rb 36954 2012-09-12 23:04:41Z zzak $
#
# 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)
SexpBuilderPP.new(src, filename, lineno).parse
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)
SexpBuilder.new(src, filename, lineno).parse
end
class SexpBuilderPP < ::Ripper #:nodoc:
private
PARSER_EVENT_TABLE.each do |event, arity|
if /_new\z/ =~ event.to_s and arity == 0
module_eval(<<-End, __FILE__, __LINE__ + 1)
def on_#{event}
[]
end
End
elsif /_add\z/ =~ event.to_s
module_eval(<<-End, __FILE__, __LINE__ + 1)
def on_#{event}(list, item)
list.push item
list
end
End
else
module_eval(<<-End, __FILE__, __LINE__ + 1)
def on_#{event}(*args)
[:#{event}, *args]
end
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 SexpBuilder < ::Ripper #:nodoc:
private
PARSER_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
end