A Scala library for building fast parsers using parser combinators with minimal boilerplate.
FastParse is a Scala library for building parsers using parser combinators, designed to be both fast and easy to write. It allows developers to define parsers declaratively by combining smaller parsing rules, making it ideal for parsing custom text formats, programming languages, or structured data. The library emphasizes performance and minimal boilerplate, enabling efficient parsing of large inputs.
Scala developers who need to parse custom text formats, implement domain-specific languages, or process structured textual data. It's particularly useful for those building compilers, interpreters, data processors, or tools that require syntax analysis.
Developers choose FastParse for its combination of performance and expressiveness—it offers the speed of hand-written parsers with the readability and maintainability of parser combinators. Unlike some alternatives, it works seamlessly across JVM and Scala.js platforms and includes production-ready parsers for languages like Scala and Python as reference implementations.
Writing Fast Parsers Fast in Scala
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Uses intuitive operators like `|`, `~`, and `rep` to build parsers declaratively, reducing boilerplate as highlighted in the key features for quick development.
Works on both JVM and Scala.js, enabling parsing in browser and server environments, which is explicitly mentioned in the key features for versatile deployment.
Optimized for speed to handle large inputs efficiently, making it suitable for performance-critical parsing tasks as noted in the description.
Includes production-ready parsers for Scala, Python, and CSS, serving as extensive examples and test suites that demonstrate real-world usage.
The README explicitly states 'No binary or source compatibility is guaranteed between any releases,' leading to potential breaking changes and upgrade friction.
Tightly coupled to the Scala language and toolchain, limiting adoption in polyglot projects or environments where Scala is not already used.
Developer documentation requires using the mill build tool with specific commands, which can be cumbersome for new contributors or those unfamiliar with mill.