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List:       python-dev
Subject:    [Python-Dev] NEWLINE sentinel behavior in CPython's PEG grammar
From:       David J W <ward.davidj () gmail ! com>
Date:       2022-10-26 17:49:02
Message-ID: CAPKNibgdt0ck5qNOd5nKEACL7aaGLvknkdq0H=Faq-9YXkxs8Q () mail ! gmail ! com
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I am writing a Rust version of Python for fun and I am at the parser stage
of development.

I copied and modified a PEG grammar ruleset from another open source
project and I've already noticed some problems (ex Newline vs NL) with how
they transcribed things.

I am suspecting that CPython's grammar NEWLINE is a builtin rule for the
parser that is something like `(Newline+ | NL+ ) {NOP}` but wanted to
sanity check if that is right before I figure out how to hack in a NEWLINE
rule and update my grammar ruleset.

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<div dir="ltr"><div class="gmail_quote"><div>I am writing a Rust version of Python \
for fun and I am at the parser stage of development.<br></div><div><br></div><div>I \
copied and modified a PEG grammar ruleset from another open source project and \
I&#39;ve already noticed some problems (ex Newline vs NL) with how they transcribed \
things.</div><div><br></div><div>I am suspecting that CPython&#39;s  grammar NEWLINE \
is a builtin rule for the parser that is something like `(Newline+  | NL+ ) {NOP}` \
but wanted to sanity check if that is right before I figure out how to hack in a \
NEWLINE rule and update my grammar ruleset.</div></div></div>



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