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46 lines
1.3 KiB
JavaScript
46 lines
1.3 KiB
JavaScript
var uglify = require('uglify-js')
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var globalVars = require('./vars')
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module.exports = addWith
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function addWith(obj, src, exclude, environments) {
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environments = environments || ['reservedVars', 'ecmaIdentifiers', 'nonstandard', 'node']
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exclude = exclude || []
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exclude = exclude.concat(detect(obj))
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var vars = detect('(function () {' + src + '}())')//allows the `return` keyword
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.filter(function (v) {
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for (var i = 0; i < environments.length; i++) {
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if (v in globalVars[environments[i]]) {
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return false;
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}
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}
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return exclude.indexOf(v) === -1
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})
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if (vars.length === 0) return src
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var declareLocal = ''
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var local = 'locals'
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if (/^[a-zA-Z0-9$_]+$/.test(obj)) {
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local = obj
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} else {
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while (vars.indexOf(local) != -1 || exclude.indexOf(local) != -1) {
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local += '_'
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}
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declareLocal = local + ' = (' + obj + '),'
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}
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return 'var ' + declareLocal + vars
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.map(function (v) {
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return v + ' = ' + local + '.' + v
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}).join(',') + ';' + src
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}
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function detect(src) {
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var ast = uglify.parse(src.toString())
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ast.figure_out_scope()
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var globals = ast.globals
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.map(function (node, name) {
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return name
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})
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return globals;
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} |