Suppose you need to parse a chunk of Ruby code (and by Ruby I obviously mean Ruby 1.9). What options do you have?
I want to rip it, rip it
The obvious choice is Ripper, an external interface to the Ruby’s parser which is distributed with the MRI Ruby itself. Let’s take a look…
=> true
pry> Ripper.sexp 'def hello(greet="world"); puts "hello #{greet}"; end'
=> [:program,
[[:def,
[:@ident, "hello", [1, 4]],
[:paren,
[:params,
nil,
[[[:@ident, "greet", [1, 10]],
[:string_literal,
[:string_content, [:@tstring_content, "world", [1, 17]]]]]],
nil,
nil,
nil]],
[:bodystmt,
[[:void_stmt],
[:command,
[:@ident, "puts", [1, 26]],
[:args_add_block,
[[:string_literal,
[:string_content,
[:@tstring_content, "hello ", [1, 32]],
[:string_embexpr, [[:var_ref, [:@ident, "greet", [1, 40]]]]]]]],
false]]],
nil,
nil,
nil]]]]
I want to rip it, rip it
The obvious choice is Ripper, an external interface to the Ruby’s parser which is distributed with the MRI Ruby itself. Let’s take a look…
CODE:
pry> require 'ripper'=> true
pry> Ripper.sexp 'def hello(greet="world"); puts "hello #{greet}"; end'
=> [:program,
[[:def,
[:@ident, "hello", [1, 4]],
[:paren,
[:params,
nil,
[[[:@ident, "greet", [1, 10]],
[:string_literal,
[:string_content, [:@tstring_content, "world", [1, 17]]]]]],
nil,
nil,
nil]],
[:bodystmt,
[[:void_stmt],
[:command,
[:@ident, "puts", [1, 26]],
[:args_add_block,
[[:string_literal,
[:string_content,
[:@tstring_content, "hello ", [1, 32]],
[:string_embexpr, [[:var_ref, [:@ident, "greet", [1, 40]]]]]]]],
false]]],
nil,
nil,
nil]]]]
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/301743/viewspace-745592/ ，如需转载，请注明出处，否则将追究法律责任。
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