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+# static-eval
+
+evaluate statically-analyzable expressions
+
+[![testling badge](https://ci.testling.com/substack/static-eval.png)](https://ci.testling.com/substack/static-eval)
+
+[![build status](https://secure.travis-ci.org/browserify/static-eval.png)](http://travis-ci.org/browserify/static-eval)
+
+# security
+
+static-eval is like `eval`. It is intended for use in build scripts and code transformations, doing some evaluation at build time—it is **NOT** suitable for handling arbitrary untrusted user input. Malicious user input _can_ execute arbitrary code.
+
+# example
+
+``` js
+var evaluate = require('static-eval');
+var parse = require('esprima').parse;
+
+var src = process.argv[2];
+var ast = parse(src).body[0].expression;
+
+console.log(evaluate(ast));
+```
+
+If you stick to simple expressions, the result is statically analyzable:
+
+```
+$ node '7*8+9'
+65
+$ node eval.js '[1,2,3+4*5-(5*11)]'
+[ 1, 2, -32 ]
+```
+
+but if you use statements, undeclared identifiers, or syntax, the result is no
+longer statically analyzable and `evaluate()` returns `undefined`:
+
+```
+$ node eval.js '1+2+3*n'
+undefined
+$ node eval.js 'x=5; x*2'
+undefined
+$ node eval.js '5-4*3'
+-7
+```
+
+You can also declare variables and functions to use in the static evaluation:
+
+``` js
+var evaluate = require('static-eval');
+var parse = require('esprima').parse;
+
+var src = '[1,2,3+4*10+n,foo(3+5),obj[""+"x"].y]';
+var ast = parse(src).body[0].expression;
+
+console.log(evaluate(ast, {
+    n: 6,
+    foo: function (x) { return x * 100 },
+    obj: { x: { y: 555 } }
+}));
+```
+
+# methods
+
+``` js
+var evaluate = require('static-eval');
+```
+
+## evaluate(ast, vars={})
+
+Evaluate the [esprima](https://npmjs.org/package/esprima)-parsed abstract syntax
+tree object `ast` with an optional collection of variables `vars` to use in the
+static expression resolution.
+
+If the expression contained in `ast` can't be statically resolved, `evaluate()`
+returns undefined.
+
+# install
+
+With [npm](https://npmjs.org) do:
+
+```
+npm install static-eval
+```
+
+# license
+
+MIT