pest-parser/pest

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The Elegant Parser

Stars: 5.4k
Forks: 307
Open beginner issues: 0
Indexed issues: 61
Avg merge: 8h 23m
Merged PRs (30d): 5

Dominant language: Rust
License: Apache-2.0
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: help wanted good first issue

Beginner friendly Everything

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61 open issues indexed

Span::lines() yields the following line when a span ends on a line break Open

Difficulty 2/5 1-3 hours Newbie friendliness 85/100

pest-parser/pest#1205 · Opened Sep 18, 2026
`pest_meta::parse_and_optimize` panics on some grammars instead of returning an error Open

meta needs-pof needs-reproduction

Difficulty 4/5 3-5 days Newbie friendliness 68/100

pest-parser/pest#1198 · 1 comment · Opened Sep 4, 2026
Add Cargo.lock to version control for reproducible builds Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

pest-parser/pest#1161 · 1 comment · Opened Mar 17, 2026
Limiting depth during parse to avoid stack overflow Open

bug help-wanted

pest-parser/pest#1129 · 7 comments · 2 reactions · 2 assignees · Opened Oct 20, 2025
Feature Request: *Optionally* add some more information while reporting errors Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

pest-parser/pest#1083 · 3 comments · Opened Feb 16, 2025
Suggestion: Expose a getter function for LineIndex Open

enhancement needs-pof pest

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

pest-parser/pest#981 · 3 comments · 1 reaction · Opened Feb 18, 2024
Very unhelpful error messages for unmapped prefix operators in pratt parsers Open

bug help-wanted

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pest-parser/pest#980 · 3 comments · Opened Feb 15, 2024
Async Pest Open

enhancement maybe needs-decision runtime-performance

Difficulty 5/5 Over a week Newbie friendliness 20/100

pest-parser/pest#974 · 3 comments · Opened Feb 8, 2024
Feature request: Option to use tags to improve error messages Open

help-wanted

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pest-parser/pest#963 · 2 reactions · Opened Jan 8, 2024
Expected operator, found EOI Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

pest-parser/pest#943 · 3 comments · 7 reactions · Opened Nov 1, 2023
Pairs has peek() but does not implement Peekable and has a different interface Open

bug

Difficulty 5/5 Over a week Newbie friendliness 35/100

pest-parser/pest#920 · Opened Aug 26, 2023
Generating statically typed syntax tree. Open

enhancement generator

Difficulty 5/5 Over a week Newbie friendliness 25/100

pest-parser/pest#882 · 16 comments · 2 reactions · Opened Jul 10, 2023
Breaking change in 2.7.0: false positive 'expression inside repetition is non-progressing and will repeat infinitely' Open

bug needs-decision

Difficulty 4/5 3-5 days Newbie friendliness 38/100

pest-parser/pest#881 · 4 comments · 1 reaction · Opened Jul 5, 2023
the error position isn't accurate Open

bug good-first-issue help-wanted

Difficulty 3/5 1-2 days Newbie friendliness 35/100

pest-parser/pest#870 · 3 comments · Opened Jun 18, 2023
[feature] Debugger: check the parser's state Open

enhancement tooling vm

Difficulty 5/5 Over a week Newbie friendliness 25/100

pest-parser/pest#852 · 3 comments · Opened May 2, 2023
POP not follow the Atomic rule Open

bug help-wanted

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pest-parser/pest#721 · 4 comments · Opened Oct 11, 2022
[feature] Generating constant str rules Open

derive enhancement generator

Difficulty 5/5 Over a week Newbie friendliness 30/100

pest-parser/pest#718 · 3 comments · 1 reaction · Opened Oct 8, 2022
Performance issues/timeouts on some grammars Open

bug help-wanted pest runtime-performance

Difficulty 5/5 Over a week Newbie friendliness 20/100

pest-parser/pest#685 · Opened Aug 10, 2022
Migration towards snapshot-based testing Open

good-first-issue help-wanted

Difficulty 5/5 Over a week Newbie friendliness 25/100

pest-parser/pest#661 · 1 comment · 3 reactions · Opened Jul 23, 2022
Request for improvement of API Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

pest-parser/pest#605 · Opened Jun 23, 2022
Allow manual rule definition for complex rules Open

enhancement grammar

Difficulty 5/5 Over a week Newbie friendliness 30/100

pest-parser/pest#600 · 3 comments · 1 reaction · Opened May 27, 2022
Stack overflow, long compile times with large repetition values Open

bug compilation-time

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pest-parser/pest#596 · 2 comments · Opened Apr 27, 2022
Separate lexer and parser? Open

maybe needs-decision needs-rfc pest

Difficulty 5/5 Over a week Newbie friendliness 25/100

pest-parser/pest#580 · 13 comments · Opened Feb 7, 2022
[Request] Add COUNT() option to pest grammar Open

enhancement grammar grammars

Difficulty 5/5 Over a week Newbie friendliness 30/100

pest-parser/pest#572 · 3 comments · 3 reactions · Opened Dec 18, 2021
Provide a way to add `#[attributes]` and custom derive to the generated `Rule` enum Open

enhancement generator needs-decision

Difficulty 5/5 Over a week Newbie friendliness 25/100

pest-parser/pest#566 · 2 comments · 1 reaction · Opened Nov 26, 2021
Case-insensitive PUSH / PEEK / POP Open

enhancement grammar

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pest-parser/pest#541 · 1 comment · Opened Sep 25, 2021
Parser derive macro triggers forbidden-lint-groups lint Open

bug generator

Difficulty 3/5 1-2 days Newbie friendliness 35/100

pest-parser/pest#539 · Opened Sep 14, 2021
Macro parses_to produces a panic message warning Open

bug generator

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

pest-parser/pest#530 · 2 reactions · Opened Aug 12, 2021
Silent atomic rule Open

enhancement grammar

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pest-parser/pest#520 · 16 comments · 57 reactions · Opened Jun 13, 2021
Disambiguate call to parse in fails_with Open

enhancement pest

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pest-parser/pest#492 · 1 reaction · Opened Feb 18, 2021
Support reverse iteration on result of parse() Open

enhancement generator grammar

Difficulty 3/5 1-2 days Newbie friendliness 35/100

pest-parser/pest#478 · 3 comments · Opened Oct 7, 2020
Better error reporting. Open

enhancement pest

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pest-parser/pest#467 · 3 comments · 7 reactions · Opened Jul 18, 2020
Solve left-recursion and improve error recovery using pika parsing Open

enhancement grammar grammars

Difficulty 5/5 Over a week Newbie friendliness 20/100

pest-parser/pest#460 · 2 comments · 7 reactions · Opened May 17, 2020
Unexpected behavior: the Silent (_) modifier does not have a cascading effect Open

enhancement grammar

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pest-parser/pest#457 · 2 comments · Opened May 7, 2020
Add pest_derive optional dependency Open

good-first-issue help-wanted pest

Difficulty 3/5 1-2 days Newbie friendliness 48/100

pest-parser/pest#446 · 3 comments · 2 reactions · Opened Feb 27, 2020
Idea: AST tree without changing representation Open

enhancement maybe needs-decision pest

Difficulty 5/5 Over a week Newbie friendliness 25/100

pest-parser/pest#440 · 1 comment · 1 reaction · Opened Feb 20, 2020
An alternative to the `Pair` API Open

enhancement pest

Difficulty 5/5 Over a week Newbie friendliness 20/100

pest-parser/pest#416 · 9 comments · 11 reactions · Opened Sep 20, 2019
Left recursion not detected Open

bug good-first-issue meta

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pest-parser/pest#411 · Opened Aug 21, 2019
Make sure all dependencies have std features disabled Open

maintenance

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pest-parser/pest#409 · 1 comment · Opened Aug 19, 2019
Utility functions to scan AST Open

enhancement maybe pest

Difficulty 5/5 Over a week Newbie friendliness 20/100

pest-parser/pest#405 · 2 comments · 1 reaction · Opened Aug 15, 2019
Timeout in recursion Open

bug runtime-performance

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pest-parser/pest#402 · 4 comments · Opened Jul 28, 2019
Semantic actions Open

enhancement pest

Difficulty 5/5 Over a week Newbie friendliness 25/100

pest-parser/pest#399 · 5 comments · 1 reaction · Opened Jun 30, 2019
Precedence climbing at the grammar level ? Open

enhancement maybe

Difficulty 5/5 Over a week Newbie friendliness 25/100

pest-parser/pest#386 · 12 comments · Opened Apr 13, 2019
Feature requests: feedback from parsing tweets Open

enhancement pest

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pest-parser/pest#370 · 3 comments · Opened Feb 15, 2019
Blanket FromStr implementation to enable Span::parse()? Open

pest question

Difficulty 3/5 1-2 days Newbie friendliness 35/100

pest-parser/pest#349 · 1 comment · Opened Dec 1, 2018
pest language evolution Open

grammar rfc

Difficulty 5/5 Over a week Newbie friendliness 25/100

pest-parser/pest#333 · 30 comments · 23 reactions · Opened Nov 6, 2018
Pre-RFC: Non-token-generating symbols in errors Open

needs-rfc

Difficulty 5/5 Over a week Newbie friendliness 25/100

pest-parser/pest#327 · 7 comments · 3 reactions · Opened Oct 30, 2018
Unicode generated files should probably not be committed Open

bootstrap enhancement maintenance

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pest-parser/pest#311 · 2 reactions · Opened Oct 12, 2018
More useful built-in rules Open

enhancement generator

Difficulty 5/5 Over a week Newbie friendliness 35/100

pest-parser/pest#306 · 2 comments · Opened Oct 4, 2018
Very slow parsing of certain grammars Open

needs-reproduction runtime-performance

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pest-parser/pest#279 · 1 comment · 1 reaction · Opened Sep 16, 2018

pest-parser/pest

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