antlr/antlr4

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ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files.

Stars: 19k
Forks: 3.5k
Open beginner issues: 0
Indexed issues: 906

Dominant language: Java
License: BSD-3-Clause
Last GitHub push: Feb 16, 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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906 open issues indexed

add rule context object factory? Open

comp:runtime type:feature

antlr/antlr4#30 · 4 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
Specify and implement lexer tracing for debugging support Open

comp:runtime lexers type:feature

antlr/antlr4#33 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Specify and implement parser tracing for debugging support Open

comp:runtime parsers type:feature

antlr/antlr4#34 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Implement a rule versioning mechanism Open

code-gen comp:runtime parsers status:pull-request type:feature

antlr/antlr4#35 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Consistent naming for combined and separated grammars Open

code-gen grammars type:feature

antlr/antlr4#37 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 14, 2026
Command line option to specify super class Open

code-gen comp:tool type:bug type:improvement

antlr/antlr4#38 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Replace reportInsufficientPredicates with reportAmbiguity and reportPredicateResolution Open

comp:runtime parsers type:feature

antlr/antlr4#39 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Explicitly resolving if/if/else ambiguity in a grammar Open

atn-analysis comp:runtime grammars parsers status:pull-request type:feature

antlr/antlr4#42 · 9 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Add Java annotation to generate grammars during a build Open

code-gen comp:tool type:feature

antlr/antlr4#86 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
No viable alternative can be incorrectly thrown for start rules without explicit EOF Open

comp:runtime type:bug

antlr/antlr4#118 · 7 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
Show warning for epsilon alts in left-recursive rules Open

comp:tool grammars type:feature

antlr/antlr4#152 · 7 comments · 0 reactions · 1 assignee · Indexed Sep 14, 2026
improve speed of non-ascii lexing Open

comp:runtime lexers type:feature

antlr/antlr4#157 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
A new lexer command: Less Open

grammars lexers type:feature

antlr/antlr4#212 · 24 comments · 16 reactions · 0 assignees · Indexed Sep 14, 2026
some improve suggestion in antlr4 main page. Open

antlr/antlr4#213 · 2 comments · 0 reactions · 1 assignee · Indexed Sep 14, 2026
rule generation, in java, does not support variable arguments Open

type:feature

antlr/antlr4#222 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Making Parse Tree Serializable Open

type:feature

antlr/antlr4#233 · 22 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Improve efficiency of sparse edge arrays Open

comp:runtime type:feature

antlr/antlr4#234 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Command-line support to export syntax diagrams to a file or files Open

antlr/antlr4#260 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Don't gen precedence predicate for left-recur X+ loops Open

code-gen comp:tool grammars type:feature

antlr/antlr4#275 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Can't find rule grammarSpec or tree structure error while using direct left recursion Open

comp:tool type:bug

antlr/antlr4#301 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Inconsistent error reporting between lexer and parser Open

antlr/antlr4#316 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Lexer semantic pred ignores fail option Open

type:feature

antlr/antlr4#320 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
tokens section in combined grammar files can't work Open

comp:tool type:bug

antlr/antlr4#338 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
when did -long-messages sneak in? Open

antlr/antlr4#339 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Semantic predicates decoupled from application specific code Open

antlr/antlr4#344 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
do we need parse tree modification routines? Open

trees-contexts type:feature

antlr/antlr4#369 · 14 comments · 10 reactions · 0 assignees · Indexed Sep 14, 2026
Copy javadoc comments to the generated parser Open

code-gen grammars type:feature

antlr/antlr4#375 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
support -depend on code generation Open

comp:tool type:feature

antlr/antlr4#384 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
can xpath see/test alt labels? Open

comp:runtime type:feature

antlr/antlr4#389 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Improved support for extracting elements from parse trees Open

comp:runtime trees-contexts type:feature

antlr/antlr4#476 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
New lexer context option proposal: emitOnMatch=true ? Open

type:feature

antlr/antlr4#491 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
New option for : lexer keyword=true Open

type:feature

antlr/antlr4#492 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Add CLI switch in TestRig to specify lexer name Open

type:bug

antlr/antlr4#493 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Redundant mutually left-recursive sets Open

comp:tool type:bug

antlr/antlr4#498 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Context classes for syntactic restrictions Open

status:pull-request trees-contexts type:feature

antlr/antlr4#521 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Add error for EOF transition reachable in closure from itself Open

atn-analysis comp:tool type:bug

antlr/antlr4#535 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Improved XPath support Open

antlr/antlr4#551 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Explicit labels not assigned to unless reference (in the context objects) Open

actions code-gen type:bug

antlr/antlr4#552 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Guard against null tree more in TreeViewer. Open

comp:runtime type:bug

antlr/antlr4#555 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Exception from Tool while parsing an ANTLR grammar Open

comp:tool grammars type:bug

antlr/antlr4#559 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
lexer grammar, import names very particular Open

type:feature

antlr/antlr4#560 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Parser issues mutual left recursion error when the left-recursive part of a rule is in parenthesis Open

comp:tool type:feature

antlr/antlr4#564 · 6 comments · 5 reactions · 0 assignees · Indexed Sep 14, 2026
Add example for disabling DFA construction Open

type:feature

antlr/antlr4#589 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Maven Plugin: prevent inclusion of generated lexers/parsers as source root (optionally) Open

antlr/antlr4#594 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
provide examples for maven plugin parameters Open

antlr/antlr4#598 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 14, 2026
An error deep in the code of an input class shows an error message starting at the class Open

comp:runtime error-handling type:bug

antlr/antlr4#608 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
add -language or at least update -help menu of tool Open

comp:tool type:feature

antlr/antlr4#648 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Check template use of currentRule.args Open

antlr/antlr4#654 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Make creating parser/lexer/etc sequence easier Open

code-gen comp:runtime type:feature

antlr/antlr4#669 · 13 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Java target should not allow any token or rule to match the grammar name Open

comp:tool type:bug

antlr/antlr4#671 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026

antlr/antlr4

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