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Contributing to the Ruby Parser
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S.H.
May 16, 2024
Technology
2
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Contributing to the Ruby Parser
In RubyKaigi 2024 Lightning Talks Slide
S.H.
May 16, 2024
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Transcript
Contributing to the Ruby Parser S.H.
About Me • S.H. • Software engineer at ESM, Inc.
• Hamada.rb Organizer • I’m hosting Ruby Hacking Challenge in Hamada.rb
None
ruby/ruby contributors
ruby/ruby contributors I’m here!
parse.y contributors
parse.y contributors I’m here!
Today Topic is… • Why I got interested in the
Ruby Parser • How I started contributing to the Ruby Parser • How I started contributing to the Universal Parser
In RubyKaigi 2021 Takeout
In RubyKaigi 2021 Takeout • parse.y is difficult to maintain
◦ No one but nobu can maintain parse.y • parse.y seems hard to understand
Is parse.y really that hard to maintain?
I’m worried
I started to reading parse.y
My first impression of parse.y • The codebase is large
• It’s hard to figure out what to begin reading • I have a no clue about BNF
What I read to study to parse.y • Ruby Under
the Microscope • Ruby Hacking Guide • ruby trunk changes
I’ve started to understand parse.y a bit
Difficulties I noticed while reading • Ruby Parser and Ripper
are interwind • The overall codebase is large
Difficulties I noticed while reading • Ruby Parser and Ripper
are interwind • The overall codebase is large It’s too hard
Difficulties I noticed while reading • Ruby Parser and Ripper
are interwind • The overall codebase is large May be able to do something here?
Let’s do it!
Action • Reusing BNF • Introducing some macros • Introducing
Ruby C API
Reusing BNF (1)
Reusing BNF (1)
Reusing BNF (2)
Reusing BNF (2)
Reusing BNF (3)
Reusing BNF (3)
Introducing macro (1)
Introducing macro (2)
Introducing Ruby C API
Results • Cut down codebase • Added dependencies by introducing
macros and Ruby C API
In RubyKaigi 2023
In RubyKaigi 2023 • I feel the future of the
Ruby Parser in “The Future of the Ruby Parser” at spikeolaf • I realized that added macros and Ruby C API are make dependencies for Universal Parser
After RubyKaigi 2023
After RubyKaigi 2023 • I read “Started parse.y Refactoring Challenge”
◦ https://yui-knk.hatenablog.com/entry/202 3/06/18/162100 • It was written want to remove the generation of literal objects in parse.y
Why? • parse.y needs Ruby C API for generation of
literal objects • Will obtain a simpler AST ◦ e.g. Fixnum, Bignum, and Float…
Let’s do it!
Introducing new NODE (1)
Introducing new NODE (2)
Reducing C API dependencies (1)
Results • Obtained a simpler AST for some literal ◦
e.g. Numeric and __ENCODING__ • Reducing Ruby C API dependencies for Universal Parser
KPT Keep motivation Should more disscuss Share my experience Increase
Parser Contributor Keep Problem Try
parse.y is NOT Hell! We can hack parse.y!