Package Exports

chevrotain
chevrotain/lib/chevrotain

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Readme

Chevrotain

Chevrotain is a Javascript parsing DSL for building high performance fault-tolerant recursive decent parsers.

Chevrotain is NOT a parser generator. It solves the same kind of problems as a parser generator, just without any code generation phase.

---> Try it online <---

Features

Lexer Engine based on Regular Expressions. * Full Token position information. * Token skipping (whitespace/comments/...). * Prioritise shorter matches (Keywords vs Identifiers). * Multiple Lexer Modes depending on the context. * Tokens Grouping. * No code generation The Lexer does not require any code generation phase.
Parsing DSL. * LL(k) grammars support.
* Error Reporting with full location information. * Strong Error Recovery/Fault-Tolerance capabilities based on Antlr3's algorithms. * Supports gates/predicates. * Backtracking support. * Grammar Inheritance. * Multiple starting rules. * No code generation.
- The DSL is just Javascript, not an external language.
- Easily debuggable.
- Short feedback loops.
- Allows great flexibility for inserting custom Parser actions
High performance.
Grammar Reflection/Introspection. * The Grammar's structure is known and exposed at runtime. * Can be used to implement advanced features such as dynamically generated syntax diagrams or Syntactic error recovery.
Well tested with ~100% code coverage, Unit & Integration tests
Generated Railroad Diagrams.

Installation

npm: npm install chevrotain
Bower bower install chevrotain

Getting Started

Online tutorial

Step #1 - Building a Lexer: online version / written version.
Step #2 - Building a Parser: online version / written version.
Step #3 - Adding actions to the Parser: online version / written version.
Step #4 - Fault tolerance and Error recovery: online version / written version.

Examples Folder

Documentation

Latest released version's HTML docs
- Parsing DSL
Annotated source code (dev version):
The aggregated Typescript definitions :
- chevrotain.d.ts (latest version)

Dependencies

None.

Compatibility

Chevrotain should run on any modern Javascript ES5.1 runtime.

The CI build runs the tests under:
- Node.js (0.12 / 4 / 5).
- Latest stable: Chrome, FireFox, IE Edge, IE 11 and Safari 9.
Uses UMD to work with common module loaders (browser global / amd / commonjs).