Vyacc is a LALR(1) parser generator written in Vlang, inspired by Yacc/Bison but designed to be modern, simple, and modular.
Its main goal is to make the development of programming languages, DSLs, and robust parsers easier and more efficient.

• 📚 Full support for LALR(1) grammars
• 🛠 Automatic AST (Abstract Syntax Tree) generation
• 🏎 Native performance powered by V
• 🎯 Clear syntax, familiar to Yacc/Bison users
• 🔗 Easy integration with your V projects

v install siguici.vyacc

📦 Vyacc on VPM

mkdir -p ${VMODULES:-$HOME/.vmodules}/siguici
git clone --depth=1 https://github.com/siguici/vyacc ${VMODULES:-$HOME/.vmodules}/siguici/vyacc

In your v.mod file:

Module {
  dependencies: ['siguici.vyacc']
}

The repository also provides native installers for manual installation:

• Linux / macOS : install.sh
• Windows : install.ps1

Minimal example of a grammar file example.y:

%token NUMBER
%left '+' '-'
%left '*' '/'

%%
expr: expr '+' expr   { $$ = $1 + $3; }
    | expr '*' expr   { $$ = $1 * $3; }
    | NUMBER          { $$ = $1; }
    ;

Generate the parser:

vyacc example.y -o parser.v
v run parser.v

v test .

Contributions are welcome!

• Fork the repository
• Create a branch feature/my-feature
• Submit a PR 🚀

Vyacc is distributed under the MIT License. You are free to use, modify, and share it.

Made with ❤️ by Sigui Kessé Emmanuel.