# Does the implementation of Ruby use Yacc?

**URL:** <https://www.ruby-forum.com/t/does-the-implementation-of-ruby-use-yacc/134993>\
**Category:** Ruby\
**Created:** [April 16, 2008, 9:56pm UTC](https://www.ruby-forum.com/t/does-the-implementation-of-ruby-use-yacc/134993 "2008-04-16T21:56:24Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![robert](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/e95f7d/32.png) [@robert](https://www.ruby-forum.com/u/robert)\
**Post date:** [April 16, 2008, 9:56pm UTC](https://www.ruby-forum.com/t/does-the-implementation-of-ruby-use-yacc/134993/1 "2008-04-16T21:56:24Z")

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Or does it use a hand-made customized parser?  
Or another pre-packaged parser tool?

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**Author:** ![robert](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/e95f7d/32.png) [@robert](https://www.ruby-forum.com/u/robert)\
**Post date:** [April 16, 2008, 10:02pm UTC](https://www.ruby-forum.com/t/does-the-implementation-of-ruby-use-yacc/134993/2 "2008-04-16T22:02:51Z")

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On Wed, Apr 16, 2008 at 3:55 PM, Robert [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> Or does it use a hand-made customized parser?  
> Or another pre-packaged parser tool?

Yes, YACC. Go check out parser.y in the source code.