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utils.js
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utils.js
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"use strict";
var assert = require("assert");
var _ = require("lodash");
var escodegen = require("escodegen");
var esprima = require("esprima");
var traverser = require("./traverser");
exports.splice = function (arr, pos, del, elems) {
Array.prototype.splice.apply(arr, [ pos, del ].concat(elems));
};
exports.unshift = function (arr, arr2) {
if (Array.isArray(arr2)) {
Array.prototype.unshift(arr, arr2);
} else {
arr.push(arr2);
}
};
exports.push = function (arr, arr2) {
if (Array.isArray(arr2)) {
Array.prototype.push.apply(arr, arr2);
} else {
arr.push(arr2);
}
};
exports.array = function (obj) {
return Array.isArray(obj) ? obj : [ obj ];
};
exports.cloneISwearIKnowWhatImDoing = function (obj) {
return JSON.parse(JSON.stringify(obj));
};
/**
* Generate a random number.
* @param {number} Inclusive minimum
* @param {number} Inclusive maximum
* @returns {number}
*/
exports.random = function (minimum, maximum) {
return Math.floor(Math.random() * (maximum - minimum)) + minimum;
};
exports.randomAlpha = function (length) {
var text = "";
var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
for (var i=0; i < length; i++) {
text += possible.charAt(Math.floor(Math.random() * possible.length));
}
return text;
};
exports.isResolvedReference = function (reference) {
return reference.resolved != null
&& reference.resolved.defs != null
&& reference.resolved.defs.length > 0;
};
exports.UniqueRandom = function(max) {
assert(typeof max == "number");
if (max > 32768) {
console.warn(`Allocating large (${max}) UniqueRandom instance`);
}
var arr = _.shuffle(_.range(max));
var idx = 0;
this.get = function() {
if (idx < max) {
return arr[idx++];
} else {
throw new Error("No numbers left");
}
};
};
exports.UniqueRandomAlpha = function (len) {
assert(typeof len == "number");
var offset = Math.pow(32, len - 1);
var rng = new exports.UniqueRandom(offset * 31);
this.get = function() {
return (offset + rng.get()).toString(32);
};
};
exports.HashMap = function () {
var store = {};
this.get = function (key) {
return store["HashMap" + key];
};
this.set = function (key, value) {
return store["HashMap" + key] = value;
};
this.exists = function (key) {
return store["HashMap" + key] !== undefined;
};
this.remove = function (key) {
delete store["HashMap" + key];
};
};
exports.hash = function (obj) {
if (obj == null) {
return "x";
}
if (typeof obj == "string") {
return "s" + obj;
}
if (typeof obj == "number") {
return "n" + obj.toString();
}
if (!obj.$$hash) {
Object.defineProperty(obj, "$$hash", {
configurable: false,
enumerable: false,
value: "o" + exports.randomAlpha(8)
});
}
return obj.$$hash;
};