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I need to add some lightweight syntactic sugar to JavaScript source code, and process it using a JavaScript-based build system. Are there any open source JavaScript parsers written in JavaScript? And are they reasonably fast when run on top of V8 or a similar high-performance JavaScript implementation?
Thank you for any pointers you can provide!
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Parsing means analyzing and converting a program into an internal format that a runtime environment can actually run, for example the JavaScript engine inside browsers. The browser parses HTML into a DOM tree. HTML parsing involves tokenization and tree construction.
Syntax parser is part of Javascript engine. It reads your code character by character, tells what your code does, and check if the grammar is correct or not. You can think syntax parser as an interpreter between your code and computer. It translates your code to machine readable code.
Parse Arguments using process.argv is the simplest way of parsing arguments in Node. js and you do not need to install any additional package or library for that.
Jison is an utility which takes a context-free grammar as input and outputs a JavaScript file capable of parsing the language described by that grammar. You can then use the generated script to parse inputs and accept, reject, or perform actions based on the input. (The syntax is similar to Yacc/Bison).
UglifyJS (JS compressor/beautifier in JavaScript) contains a complete JavaScript parser that exposes a simple API. It's heavily tested and used in some big projects (WebKit).
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The fastest Javascript parser in Javascript was esprima.
It also gives you
Sensible format for the abstract syntax tree (AST), compatible with Mozilla Parser API
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