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RFC: proof-of-concept for feature-tracking and perl sub signatures (see #273)

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**For the shortest summary, see `Changes` file.** ---- This is a basic implementation of feature-tracking in the parser, with most of the parts that mainly need to be expanded sketched...

wchristian

The Keyword Question

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---- **Edit:** I have implemented a proof-of-concept, please review and comment: https://github.com/Perl-Critic/PPI/pull/280 ---- ---- ---- This spawned from discussion in #194 and https://github.com/Perl-Critic/Perl-Critic/issues/591 There are a lot of hard problems...

wchristian

Allow statements as well as structures and tokens to be inserted adjacent to a token

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Otherwise, this would be impossible: ``` my $doc = PPI::Document->new(\ "1;\n"); my $token = $doc->last_element; my $new_document = PPI::Document->new(\ '$foo = 1;'); $token->insert_after($_) foreach reverse $new_document->schildren; ```

karenetheridge

wchristian

wchristian

wchristian

wchristian

wchristian

wchristian

As requested by @wchristian at https://github.com/Perl-Critic/PPI/pull/247#issuecomment-1187726564

oalders