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Node pattern compiler #105

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Node pattern compiler #105

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marcandre
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@marcandre marcandre commented Aug 29, 2020 •
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This PR is a complete rewrite of the NodePattern compilation.

It aims to be 100% compatible, and also:

  • parser outputing AST (optionally with locations and comments)
  • debugging functionality (basic rake task for now)
  • allows multiple variable-length terms (strictly eager only)
  • also outputs code for a lambda

It's a big PR... I wrote a hacker's guide that should help explaining the main concepts.

Anyone interested in reviewing this? Thanks to @MaxLap for reviewing an initial draft 馃憤

@marcandre marcandre force-pushed the node_pattern_compiler branch 2 times, most recently from b0eb31b to 7637762 Compare August 29, 2020 21:34
@marcandre marcandre mentioned this pull request Aug 29, 2020
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@marcandre marcandre marked this pull request as draft August 30, 2020 04:24
@marcandre marcandre marked this pull request as ready for review August 30, 2020 04:54
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pirj approved these changes Aug 30, 2020
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Didn't dive into compiling, the rest looks very readable and elegant 馃憦

lib/rubocop/ast/node_pattern/lexer.rb Outdated Show resolved Hide resolved
lib/rubocop/ast/node_pattern/node.rb
a.is_a?(Range) ? a : INT_TO_RANGE[a]
end

INT_TO_RANGE = Hash.new { |h, k| h[k] = k..k }
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Is this a memory optimization technique? Why?
How does it work?

INT_TO_RANGE[1] === INT_TO_RANGE[1] # => false

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Yeah, not sure it's that useful. INT_TO_RANGE[42] # => 42..42. I wanted to avoid returning new Ranges all the time, or having to memoize it per node, but I might do that in the end (in the constructor, coz they are frozen).

lib/rubocop/ast/node_pattern/node.rb Outdated Show resolved Hide resolved
lib/rubocop/ast/node_pattern/node.rb Show resolved Hide resolved
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lib/rubocop/ast/node_pattern/compiler.rb Show resolved Hide resolved
lib/rubocop/ast/node_pattern/compiler.rb Outdated Show resolved Hide resolved
@marcandre marcandre marked this pull request as draft August 30, 2020 19:51
@marcandre marcandre force-pushed the node_pattern_compiler branch 2 times, most recently from 33bddc4 to f011935 Compare August 30, 2020 19:57
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I have a proof of concept for multiple length union #79 (e.g. (send { nil? :foo | const :bar int+ })) which made apparent some needed small refactoring of the SequenceSubcompiler (upcoming), and of Node#in_sequence_head (pushed), so I put this as draft, but should be ready soon.

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jonatas commented Sep 4, 2020

More than a year of compiler classes on a single PR @marcandre! 馃く
I'd love to spend an hour in a sharing session and you could walk through all these changes with me and other people interested in the code. We can even record or live stream it. wdyt?

@marcandre marcandre force-pushed the node_pattern_compiler branch 6 times, most recently from 5055a2c to 8b9c1b0 Compare September 11, 2020 18:33
@marcandre marcandre marked this pull request as ready for review September 11, 2020 18:36
@marcandre marcandre mentioned this pull request Sep 11, 2020
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Merged 馃帀 . To be released tomorrow.

@marcandre marcandre closed this Sep 27, 2020
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