Check Ruby syntax programmatically [duplicate]

Question

How can I check if Ruby code is parsable, without executing it?

Basically, I want the functionality of ruby -c code.rb, without actually writing to a temporary file. Note that there is the problem of properly escaping the code if one is to use ruby -ce 'some_ruby_code'.

Ideally, there should be something in the standard lib, but I couldn't find it.

@Felix awesome, I will close this question as duplicate when I go home. Not sure how I missed that. Thanks a lot! — ndnenkov
– ndnenkov, Commented Sep 13, 2016 at 15:53

Felix · Accepted Answer · 2016-09-13 15:42:44Z

1

ruby -c can read from standard input, like in cat code.rb | ruby -c.

Interactively you can ruby -c, type in text and press Ctrl+D to signalize end-of-file.

Examples are for Linux/Unix, no idea how this would work in Windows.

answered Sep 13, 2016 at 15:42

Felix

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2 Comments

ndnenkov Over a year ago

That is a possible workaround. However, I would prefer if I could stay in ruby. Piping is better than reading/writing files, but still has its issues. Ideally, I don't want to call external commands at all.

Felix Over a year ago

I think your question is a duplicate, then :)

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