gram_grep VS ast-grep

There is also gram_grep[0]"Search text using a grammar, lexer, or straight regex. Chain searches for greater refinement."

See also parsertl-playground[1] for online edit/test grammars.

[0]https://github.com/BenHanson/gram_grep

I'm building an online yacc/lex (LALR(1)) grammar editor/tester to help develop/debug/document grammars, the main repository is here https://github.com/mingodad/parsertl-playground and the online playground with several non trivial examples is here https://mingodad.github.io/parsertl-playground/playground/ .

Select a grammar/example from "Examples" select box and then click "Parse" to see a parser tree for the source in "Input source" editor.

It's based on https://github.com/BenHanson/gram_grep and https://github.com/BenHanson/lexertl14 .

Any feedback is welcome !

The grammars available so far (with varying state of correctness):

- Ada parser

Thanks for the tip, but I fear storing the result on the stack will be too much to ask for for big lexers (see https://github.com/BenHanson/gram_grep/blob/c64f8829661f11b38a55b42b37f5051c5eabfaa6/main.cpp#L2301 for example).

This article illustrates the usage of ast-grep, a tool designed to locate and substitute patterns in your codebase, towards easing your migration to React 19.

This looks great, thanks for building and sharing it.

Interested folks may also want to check out ast-grep:

https://github.com/ast-grep/ast-grep

ast-grep is a command-line tool that lets you search and transform code written in many programming languages using abstract syntax trees (ASTs). ASTs are data structures that capture the syntactic and semantic structure of source code. With ast-grep, you can write patterns as if you are writing ordinary code, and it will match all code that has the same syntactical structure. And if you need more power, you can use YAML, a rule system that allows you to write more sophisticated linting rules or code modifications.

I really like this - it means the tool is available to people with familiarity of any of those four distribution mechanisms.

You can also download pre-built binaries from their releases page: https://github.com/ast-grep/ast-grep/releases/tag/0.14.2

On top of that, they offer API bindings for it in three different languages:

- Rust (not yet stable): https://docs.rs/ast-grep-core/latest/ast_grep_core/

- JavaScript/TypeScript: https://ast-grep.github.io/guide/api-usage/js-api.html

- Python: https://ast-grep.github.io/guide/api-usage/py-api.html

It's rare to see a tool/library offer this depth of language support out of the box.

Is there an open source library that does this? Maybe something on top of ast-grep