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Decouple RubyLex from prompt and line_no #701

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merged 3 commits into from
Oct 12, 2023

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@tompng tompng commented Aug 30, 2023

Removes the last RubyLex's instance variable @prompt and @line_no.

Reason:
@line_no is completely controlled by IRB::Irb with @scanner.increase_line_no. It should be IRB::Irb's instance variable.
@scanner.set_prompt do end and @scanner.prompt(args) seems roundabout.
I wanted to remove save_prompt_to_context_io because the flow is complex and hard to understand.

After deleting @prompt and @line_no from RubyLex, RubyLex will have no state at all. RubyLex does not have to be a class anymore.

@tompng tompng marked this pull request as ready for review October 11, 2023 15:12
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Currently we don't declare private methods under IRB::Irb, but I think these 2 prompt methods can be the first 2. WDYT?
While we expect Irb to be a private component, it's still relatively easy to retrieve (e.g. with irb_context.irb) and could be used by us in other gems too (e.g. ruby/debug#1024). So making some methods private could ideally make people think twice before calling them.

lib/irb.rb Outdated Show resolved Hide resolved
@tompng tompng merged commit 1ceb97f into ruby:master Oct 12, 2023
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@tompng tompng deleted the stateless_rubylex branch October 12, 2023 12:53
matzbot pushed a commit to ruby/ruby that referenced this pull request Oct 12, 2023
(ruby/irb#701)

* Remove instance variable prompt and line_no from RubyLex

* Fix prompt test

* Rename prompt generating method and make it private

ruby/irb@1ceb97fe2e
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