##jsep: A Tiny JavaScript Expression Parser jsep is a simple expression parser written in JavaScript. It can parse JavaScript expressions but not operations. The difference between expressions and operations is akin to the difference between a cell in an Excel spreadsheet vs. a proper JavaScript program.
###Why jsep? I wanted a lightweight, tiny parser to be included in one of my other libraries. esprima and other parsers are great, but had more power than I need and were way too large to be included in a library that I wanted to keep relatively small.
jsep's output is almost identical to esprima's, which is in turn based on SpiderMonkey's.
###Custom Build First, install Grunt. While in the jsep project directory, run:
npm install .
grunt
The jsep built files will be in the build/ directory.
###Usage
####Client-side
<script src="/PATH/TO/jsep.min.js" type="text/javascript"></script>
...
var parse_tree = jsep("1 + 1");
####Node.JS
First, run npm install jsep. Then, in your source file:
var jsep = require("jsep");
var parse_tree = jsep("1 + 1");
####Custom Operators // Add a custom ^ binary operator with precedence 10 jsep.addBinaryOp("^", 10);
// Add a custom @ unary operator with precedence 10
jsep.addUnaryOp('@');
// Remove a binary operator
jsep.removeBinaryOp(">>>");
// Remove a unary operator
jsep.removeUnaryOp("~");
###License jsep is under the MIT license. See LICENSE file.
###Thanks Some parts of the latest version of jsep were adapted from the esprima parser.