haskell/alex

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A lexical analyser generator for Haskell

Stars: 323
Forks: 87
Open beginner issues: 0
Indexed issues: 28

Dominant language: Haskell
License: BSD-3-Clause
Last GitHub push: Apr 15, 2026
Latest indexed: Sep 14, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed
PR merge metrics: No merged PRs in 30d

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28 open issues indexed

make a ghc-style preprocessor script Open

haskell/alex#4 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Feature Request: Allow for Lazy Regex Operators Open

haskell/alex#7 · 0 comments · 2 reactions · 0 assignees · Indexed Sep 14, 2026
Allow giving options through input pragmas... Open

feature request options

haskell/alex#25 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Expose library component Open

haskell/alex#45 · 1 comment · 3 reactions · 0 assignees · Indexed Sep 14, 2026
basic-bytestring wrapper does not work with left contexts Open

haskell/alex#53 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
feature request: support incremental/streaming lexing Open

feature request

haskell/alex#67 · 11 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Control case-sensitivity Open

haskell/alex#74 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Get rid of overly long lines in generated .hs file Open

feature request output formatting

haskell/alex#84 · 14 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
strict-bytestring wrapper is undocumented Open

haskell/alex#85 · 0 comments · 3 reactions · 0 assignees · Indexed Sep 14, 2026
GHC-generated LINE annotation might cause non-deterministic build Open

info needed LINE annotations output formatting upstream

haskell/alex#105 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Feature request: provide Template Haskell quasiquoter that generates lexer definition in-place Open

haskell/alex#108 · 1 comment · 3 reactions · 0 assignees · Indexed Sep 14, 2026
Provide macros corresponding to the Unicode general categories Open

haskell/alex#126 · 11 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
Use unsafeShiftR in utf8Encode Open

haskell/alex#129 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Builtin support for nested comments or a canonical way to handle them Open

haskell/alex#133 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 14, 2026
Feature: allow the user to capture groups on regex Open

feature request

haskell/alex#148 · 4 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
Alex slow on big regular expressions Open

haskell/alex#163 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Empty language crashes alex with (Array.!): undefined array element Open

haskell/alex#164 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Allow custom error types in monad wrappers Open

feature request wrapper

haskell/alex#178 · 8 comments · 7 reactions · 0 assignees · Indexed Sep 14, 2026
Don't vendor Ranged-sets? Open

haskell/alex#182 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Feature request: Add support for UTF8 bytestring wrappers (utf8-bytestring-basic, utf8-bytestring-posn...) Open

haskell/alex#192 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Explore unboxed parser representations Open

haskell/alex#193 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
How to build `alex` from git sources? Instructions in `README.md` are broken. Open

bug build / install documentation

haskell/alex#198 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Agda-style Lexing Open

discussion

haskell/alex#203 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
UTF-8 and text 2.0 Open

re: unicode

haskell/alex#211 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Is module DFS really needed? Open

haskell/alex#232 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Is there a way to be able to run a lexer from two different start codes? Open

haskell/alex#267 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Is there a way to modify the default lexical error message from within an .x file. Open

haskell/alex#276 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Strict `Text` wrapper unnecessarily decodes to `Char` for `text-2.*` Open

haskell/alex#280 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026

haskell/alex

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