Lexer Generator
Expert skill for generating and hand-writing lexers using DFA-based, table-driven, and recursive approaches
npx skills add a5c-ai/babysitter --skill lexer-generator --agent claude-code
Same command for any agent — swap --agent for codex, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# Lexer Generator Skill ## Overview Expert skill for generating and hand-writing lexers using various approaches including DFA-based lexers, table-driven lexers, and hand-written recursive lexers. ## Capabilities - Generate lexer from regular expression specifications - Implement maximal munch tokenization - Handle Unicode character classes and normalization - Implement efficient keyword recognition (tries, perfect hashing) - Support incremental/resumable lexing for IDE integration - Generate lexer tables and state machines - Handle lexer modes and contexts (e.g., string interpolation) - Implement error recovery with skip-to-next strategies ## Target Processes - lexer-implementation.js - language-grammar-design.js - lsp-server-implementation.js - repl-development.js ## Dependencies - Flex-like generators - RE2/Hyperscan libraries ## Usage Guidelines 1. **Token Definition**: Start by defining the complete set of tokens with their regex patterns 2. **Maximal Munch**: Always implement maximal munch to handle ambiguous token boundaries 3. **Unicode Support**: Consider Unicode normalization forms and character classes from the start 4. **Error Recovery**: Implement skip-to-next-valid st
- Overview
- Capabilities
- Target Processes
- Dependencies
- Usage Guidelines
- Output Schema
What does the Lexer Generator skill do?
Expert skill for generating and hand-writing lexers using DFA-based, table-driven, and recursive approaches
How do I install it?
Run `npx skills add a5c-ai/babysitter --skill lexer-generator --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From a5c-ai/babysitter, a repository with 1,642 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.