解析红宝石代码 [英] Parse ruby code

问题描述

我需要解决一个问题.我有一个表，其中的列包含一些红宝石代码，例如:self.org_premium = self.volume / 12 * 0.1492 self.billing_premium = self.subscriber_premium + self.org_premium或employment_level == 'P'或vol_life.save. 现在，我想在这些字符串中查找方法，但是必须忽略某些Rails方法，例如save或nil?. 我使用了Ripper，但是他的方法slice仅返回1个参数. 也许您对此有一些了解?

I need help in one problem. I have a table with columns that contain some ruby code, like this: self.org_premium = self.volume / 12 * 0.1492 self.billing_premium = self.subscriber_premium + self.org_premium or employment_level == 'P' or vol_life.save. And now I want find methods in these strings, but some Rails methods, like save or nil? must be ignored. I used Ripper, but his method slice return only 1 param. Maybe you have some idea about this?

推荐答案

使用要查看可用的事件，只需评估其在文档:EVENTS中所引用的常量，这些常量将进一步细分为PARSER_EVENTS和SCANNER_EVENTS.

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.

$ 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] 

在这种情况下，"ident"是用于方法名称定义的事件，并且该事件实际上并不等同于代码中调用的方法.

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.

我不确定Ripper是解析使用的方法名称的最简单方法.另外，Ruby能够处理由method_missing处理的调用，这确实使我们很难理解可以解释什么.

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 method_missing really make it difficult to see what could be interpreted.

就像我在评论中说的那样，还有其他几种方法可以解析您可能要研究的方法.

Like I said in the comments, there are several other ways to parse methods you might look into.

您甚至可以通过字符串操作/检查可用方法来进行类似的操作，例如

You could even just make something similar with string operations/checking available methods, e.g.

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

用法:

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"]

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