ast-grep

Translate natural language queries into ast-grep rules for structural code search.

19|3|Updated Feb 4, 2021
One-click install
npx skills add https://github.com/laulauland/dotfiles --skill ast-grep-laulauland
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: ast-grep
Source: https://github.com/laulauland/dotfiles/tree/main/shared/.claude/skills/ast-grep
Command: npx skills add https://github.com/laulauland/dotfiles --skill ast-grep-laulauland

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Structural code search often requires deep understanding of language grammar and ASTs. This skill provides a practical guide to translating natural language queries into ast-grep rules, enabling precise searches across large codebases by pattern, language constructs, and structural characteristics.

Core Features & Use Cases

  • Translate natural language queries into deterministic ast-grep rules for structural code search.
  • Provide step-by-step workflows to understand the query, create test code, write rules, and validate matches.
  • Offer CLI tips and debugging guidance to inspect AST structure and ensure correct rule behavior.

Quick Start

Craft an ast-grep rule to locate all async functions using await in JavaScript.

Frequently Asked Questions about ast-grep

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I search for specific code patterns using AST structures instead of plain text?

Structural code search using AST structures matches language constructs precisely instead of plain text. Translating natural language queries into deterministic ast-grep rules enables pattern matching across large codebases by syntax structure.

What is the best way to translate natural language queries into deterministic code search rules?

Translating natural language queries into deterministic code search rules involves a step-by-step workflow: understanding the query, creating test code, writing YAML rules with metavariables, and validating matches before applying them.

Do I need to understand YAML and metavariables to write ast-grep rules for structural code search?

Writing ast-grep rules requires understanding YAML rule syntax, metavariables, and the ast-grep CLI. This knowledge is necessary to craft deterministic structural patterns and inspect AST structures for correct rule behavior.

How does tree-sitter based AST pattern matching work for finding language constructs?

AST pattern matching uses tree-sitter to parse code into syntax trees, allowing rules to target structural characteristics. This ensures searches find exact language constructs and design patterns rather than arbitrary text matches.

Can I use ast-grep to find specific design patterns across a large codebase?

Ast-grep rules empower precise code search to find language constructs and design patterns across large codebases. By matching AST structures, you can reliably locate specific structural code patterns without false text matches.

What are the limitations of structural code search when dealing with complex language grammar?

Structural code search with complex language grammar requires deep understanding of ASTs. You must craft and test rules carefully before applying them to real repositories to ensure correct behavior and avoid invalid syntax matches.