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PEG: Add full support for PEG + some extensions

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This commit adds support for PEG as described in:

    <https://bford.info/pub/lang/peg.pdf>

It adds support for the missing features (comments, underscores in
identifiers and escaping) while keeping the extensions (dashes in
identifiers, < and <--).

The naming system tries to be as close as possible to the one proposed
in the paper.

* module/ice-9/peg/string-peg.scm: Rewrite PEG parser.
* test-suite/tests/peg.test: Fix import

Signed-off-by: Ludovic Courtès <ludo@gnu.org>
This commit is contained in:
Ekaitz Zarraga 2024-09-11 21:19:26 +02:00 • committed by Ludovic Courtès
parent 47807c9b11
commit ff11753df1
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4 changed files with 313 additions and 180 deletions
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@ -20,6 +20,13 @@ downright unusable (e.g., <https://bugs.gnu.org/72378>), non-conforming
(e.g., <https://bugs.gnu.org/72383>), or buggy (e.g.,
<https://bugs.gnu.org/72372>).
* New interfaces and functionality
** PEG parser
PEG grammar parser in (ice-9 peg string-peg) has been rewritten to cover
all the functionality defined in <https://bford.info/pub/lang/peg.pdf>.
** GOOPS: Introduce new forms method* and define-method*
The module (oop goops) now exports method* and define-method* which are