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HerbPowerful and seamless HTML-aware ERB parsing and tooling.

Next-generation HTML+ERB parsing for smarter developer tooling and
more.

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Herb


HTML-aware

Intelligently recognizes and navigates HTML structure within ERB
templates, ensuring precise parsing across interleaved markup and
Ruby code.



Built on Prism

Powered by Prism, Ruby's new official default parser as of Ruby 3.4.
Prism is designed to be error-tolerant and is adopted by major Ruby
runtimes including CRuby, JRuby, TruffleRuby.



Error-Tolerant

Designed to handle errors gracefully, it provides accurate results
even when encountering syntax errors.

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Engineered for Speed

Parses input fast enough to update on every keystroke, ensuring
real-time responsiveness in text editors and other tools.



Whitespace-Aware

Accurately preserves spacing and formatting in the parse result.



LSP-Ready

Works seamlessly with Language Server Protocols (LSP) for a better
experience in modern editors.



Precise Position Tracking

Tracks precise locations down to individual character offsets for
every node and token, enabling precise debugging, annotations, and
diagnostics.



Works Across Languages

Native bindings for Ruby, JavaScript/TypeScript, and other high-level
programming languages.

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Expanding Template Language Support

Future updates will expand beyond ERB through a unified parser and
syntax tree architecture that maintains consistent APIs across
different templating languages.

Released under the MIT License.

Copyright (c) 2024 Marco Roth and the Herb Contributors.