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constantinople

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Comparing version 2.0.1 to 3.0.0

52

index.js
'use strict'
var uglify = require('uglify-js')
var detect = require('acorn-globals');
var lastSRC = '(null)'
var lastRes = true
var lastSRC = '(null)';
var lastRes = true;
var lastConstants = undefined;
module.exports = isConstant
module.exports = isConstant;
function isConstant(src, constants) {
src = '(' + src + ')'
if (lastSRC === src && lastConstants === constants) return lastRes
lastSRC = src
src = '(' + src + ')';
if (lastSRC === src && lastConstants === constants) return lastRes;
lastSRC = src;
lastConstants = constants;
try {
Function('return (' + src + ')');
return lastRes = (detect(src).filter(function (key) {
return !constants || !(key in constants)
}).length === 0)
return !constants || !(key.name in constants);
}).length === 0);
} catch (ex) {
return lastRes = false
return lastRes = false;
}
}
isConstant.isConstant = isConstant
isConstant.isConstant = isConstant;
isConstant.toConstant = toConstant
isConstant.toConstant = toConstant;
function toConstant(src, constants) {
if (!isConstant(src, constants)) throw new Error(JSON.stringify(src) + ' is not constant.')
if (!isConstant(src, constants)) throw new Error(JSON.stringify(src) + ' is not constant.');
return Function(Object.keys(constants || {}).join(','), 'return (' + src + ')').apply(null, Object.keys(constants || {}).map(function (key) {

@@ -31,25 +33,1 @@ return constants[key];

}
function detect(src) {
var ast = uglify.parse(src.toString())
ast.figure_out_scope()
var globals = ast.globals
.map(function (node, name) {
return name
})
// Walk the AST tree in search for `this`
// Add a fake "this" global when found
var has_this = false;
var walker = new uglify.TreeWalker(function(node) {
if (node instanceof uglify.AST_This) {
has_this = true;
}
});
ast.walk(walker);
if (has_this) {
globals.push('this')
}
return globals
}
{
"name": "constantinople",
"version": "2.0.1",
"version": "3.0.0",
"description": "Determine whether a JavaScript expression evaluates to a constant (using UglifyJS)",
"keywords": [],
"dependencies": {
"uglify-js": "~2.4.0"
"acorn-globals": "^1.0.0"
},

@@ -9,0 +9,0 @@ "devDependencies": {

@@ -7,3 +7,3 @@ # constantinople

[![Dependency Status](https://img.shields.io/gemnasium/ForbesLindesay/constantinople.svg)](https://gemnasium.com/ForbesLindesay/constantinople)
[![NPM version](https://img.shields.io/npm/v/constantinople.svg)](http://badge.fury.io/js/constantinople)
[![NPM version](https://img.shields.io/npm/v/constantinople.svg)](https://www.npmjs.org/package/constantinople)

@@ -43,2 +43,2 @@ ## Installation

MIT
MIT
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