esparse

esparse is a parser for the ECMAScript programming language, written in JavaScript. Given a string representing a JavaScript program, it will output an abstract syntax tree representing that program.

Project Goals

The primary goal of this project is to implement an ECMAScript parser:

• Whose source code is clear, easy to follow, and aesthetically pleasing.
• That is easy to extend or modify for language experimentation purposes.
• That provides an AST structure which is easy to traverse, easy to manipulate, and is convenient for a wide variety of code transformation use cases.
• Whose performance is comparable to other modern ECMAScript parsers which are written in JavaScript.

AST compatibility with other parsers is not a project goal. However, it is expected that any future changes to the AST protocol will be backward compatible with previous versions.