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copied!<p>When you use <a href="http://www.ruby-doc.org/stdlib-2.0.0/libdoc/ripper/rdoc/Ripper.html" rel="nofollow">Ripper</a> to slice, e.g.:</p> <pre><code>$ irb 2.0.0p247 :001 > p Ripper.slice('def m(a) nil end', 'ident') </code></pre> <p>To see what events are available, just evaluate the constants it refers to in the doc: EVENTS which are further broken down into PARSER_EVENTS, and SCANNER_EVENTS.</p> <pre><code>$ irb 2.0.0p247 :001 > require 'ripper' 2.0.0p247 :002 > Ripper::EVENTS => [:BEGIN, :END, :alias, :alias_error, :aref, :aref_field, :arg_ambiguous, :arg_paren, :args_add, :args_add_block, :args_add_star, :args_new, :array, :assign, :assign_error, :assoc_new, :assoc_splat, :assoclist_from_args, :bare_assoc_hash, :begin, :binary, :block_var, :block_var_add_block, :block_var_add_star, :blockarg, :bodystmt, :brace_block, :break, :call, :case, :class, :class_name_error, :command, :command_call, :const_path_field, :const_path_ref, :const_ref, :def, :defined, :defs, :do_block, :dot2, :dot3, :dyna_symbol, :else, :elsif, :ensure, :excessed_comma, :fcall, :field, :for, :hash, :if, :if_mod, :ifop, :lambda, :magic_comment, :massign, :method_add_arg, :method_add_block, :mlhs_add, :mlhs_add_star, :mlhs_new, :mlhs_paren, :module, :mrhs_add, :mrhs_add_star, :mrhs_new, :mrhs_new_from_args, :next, :opassign, :operator_ambiguous, :param_error, :params, :paren, :parse_error, :program, :qsymbols_add, :qsymbols_new, :qwords_add, :qwords_new, :redo, :regexp_add, :regexp_literal, :regexp_new, :rescue, :rescue_mod, :rest_param, :retry, :return, :return0, :sclass, :stmts_add, :stmts_new, :string_add, :string_concat, :string_content, :string_dvar, :string_embexpr, :string_literal, :super, :symbol, :symbol_literal, :symbols_add, :symbols_new, :top_const_field, :top_const_ref, :unary, :undef, :unless, :unless_mod, :until, :until_mod, :var_alias, :var_field, :var_ref, :vcall, :void_stmt, :when, :while, :while_mod, :word_add, :word_new, :words_add, :words_new, :xstring_add, :xstring_literal, :xstring_new, :yield, :yield0, :zsuper, :CHAR, :__end__, :backref, :backtick, :comma, :comment, :const, :cvar, :embdoc, :embdoc_beg, :embdoc_end, :embexpr_beg, :embexpr_end, :embvar, :float, :gvar, :heredoc_beg, :heredoc_end, :ident, :ignored_nl, :int, :ivar, :kw, :label, :lbrace, :lbracket, :lparen, :nl, :op, :period, :qsymbols_beg, :qwords_beg, :rbrace, :rbracket, :regexp_beg, :regexp_end, :rparen, :semicolon, :sp, :symbeg, :symbols_beg, :tlambda, :tlambeg, :tstring_beg, :tstring_content, :tstring_end, :words_beg, :words_sep] 2.0.0p247 :009 > Ripper::PARSER_EVENTS => [:BEGIN, :END, :alias, :alias_error, :aref, :aref_field, :arg_ambiguous, :arg_paren, :args_add, :args_add_block, :args_add_star, :args_new, :array, :assign, :assign_error, :assoc_new, :assoc_splat, :assoclist_from_args, :bare_assoc_hash, :begin, :binary, :block_var, :block_var_add_block, :block_var_add_star, :blockarg, :bodystmt, :brace_block, :break, :call, :case, :class, :class_name_error, :command, :command_call, :const_path_field, :const_path_ref, :const_ref, :def, :defined, :defs, :do_block, :dot2, :dot3, :dyna_symbol, :else, :elsif, :ensure, :excessed_comma, :fcall, :field, :for, :hash, :if, :if_mod, :ifop, :lambda, :magic_comment, :massign, :method_add_arg, :method_add_block, :mlhs_add, :mlhs_add_star, :mlhs_new, :mlhs_paren, :module, :mrhs_add, :mrhs_add_star, :mrhs_new, :mrhs_new_from_args, :next, :opassign, :operator_ambiguous, :param_error, :params, :paren, :parse_error, :program, :qsymbols_add, :qsymbols_new, :qwords_add, :qwords_new, :redo, :regexp_add, :regexp_literal, :regexp_new, :rescue, :rescue_mod, :rest_param, :retry, :return, :return0, :sclass, :stmts_add, :stmts_new, :string_add, :string_concat, :string_content, :string_dvar, :string_embexpr, :string_literal, :super, :symbol, :symbol_literal, :symbols_add, :symbols_new, :top_const_field, :top_const_ref, :unary, :undef, :unless, :unless_mod, :until, :until_mod, :var_alias, :var_field, :var_ref, :vcall, :void_stmt, :when, :while, :while_mod, :word_add, :word_new, :words_add, :words_new, :xstring_add, :xstring_literal, :xstring_new, :yield, :yield0, :zsuper] 2.0.0p247 :010 > Ripper::SCANNER_EVENTS => [:CHAR, :__end__, :backref, :backtick, :comma, :comment, :const, :cvar, :embdoc, :embdoc_beg, :embdoc_end, :embexpr_beg, :embexpr_end, :embvar, :float, :gvar, :heredoc_beg, :heredoc_end, :ident, :ignored_nl, :int, :ivar, :kw, :label, :lbrace, :lbracket, :lparen, :nl, :op, :period, :qsymbols_beg, :qwords_beg, :rbrace, :rbracket, :regexp_beg, :regexp_end, :rparen, :semicolon, :sp, :symbeg, :symbols_beg, :tlambda, :tlambeg, :tstring_beg, :tstring_content, :tstring_end, :words_beg, :words_sep] </code></pre> <p>The 'ident' is an event for method name definition in this case, and that event isn't really equivalent to a method that is called in the code.</p> <p>I'm not sure that Ripper would be the easiest way to parse out method names that are used. In addition, the ability for Ruby to handle calls handled by <code>method_missing</code> really make it difficult to see what could be interpreted.</p> <p>Like I said in the comments, there are several other ways to parse methods you might look into.</p> <p>You could even just make something similar with string operations/checking available methods, e.g.</p> <pre><code>class A IGNORE = %w{save nil?} def find_possible_methods(s) s.split(/[\-\ ,\.\(\)\{\}\[\]]/).reject{|c| c =~ /[0-9\*\-\/\+\%\=\~].*/ || c.empty? || IGNORE.include?(c)} end def find_implemented_methods(s) (s.split(/[\-\ ,\.\(\)\{\}\[\]]/) & (methods + private_methods).collect(&:to_s)).reject{|c| IGNORE.include?(c)} end end </code></pre> <p>Usage:</p> <pre><code>a = A.new => #<A:0x007facb9a94be8> a.find_possible_methods 'self.org_premium = self.volume / 12 * 0.1492 self.billing_premium = self.subscriber_premium + self.org_premium' => ["self", "org_premium", "self", "volume", "self", "billing_premium", "self", "subscriber_premium", "self", "org_premium"] </code></pre>

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