Parse structured input with lean4-parser combinators for Lean text processing.
npx skills add https://github.com/kim-em/AoC2025 --skill parsing
Please help me install this Agent Skill. Skill: parsing Source: https://github.com/kim-em/AoC2025/tree/main/.claude/skills/parsing Command: npx skills add https://github.com/kim-em/AoC2025 --skill parsing
This Skill demonstrates how to use the lean4-parser library to parse structured input, reducing ad-hoc string handling and increasing correctness for AoC puzzles and general text processing tasks.
char, string, ASCII.parseInt, sepBy, first, and endOfInput to build clear parsers.Create a Small parser using lean4-parser to read a line like "1, -2, 3" into a list [1, -2, 3], and run it on your input.
High-intent search queries and answers about installing and using this skill.
Use the lean4-parser library with SimpleParser and combinators like `char`, `string`, and `ASCII.parseInt` to build robust parsers. This approach eliminates ad-hoc string handling and provides helpful error messages for tasks like parsing numbers, coordinates, and key-value pairs.
lean4-parser includes primitives such as `ASCII.parseNat`, `ASCII.parseInt`, `sepBy`, `takeMany`, `dropMany`, `whitespace`, `eol`, `endOfInput`, and `optional`. These combinators compose to handle lines of numbers, coordinate lists, and structured data parsing efficiently.
Yes. lean4-parser is designed for AoC parsing tasks. Build parsers to read formatted inputs like "1, -2, 3" into structured data, avoiding fragile splitting and regex approaches while maintaining clarity and correctness.
Combine `optional` for conditional fields and `sepBy` or `takeMany` for repeated elements. These combinators let you express variable-length inputs and missing values cleanly without nested conditionals or loops.
Use `endOfInput` to ensure the entire input is consumed and `test` to validate parser results. lean4-parser's error messages guide debugging, and type safety in Lean enforces constraints on parsed values.
No. Start with SimpleParser and basic combinators. The library abstracts parser complexity; you compose simple, readable functions to build parsers incrementally without deep combinator theory.
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