59 lines
2.1 KiB
JavaScript
59 lines
2.1 KiB
JavaScript
(function (global, factory) {
|
|
typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
|
|
typeof define === 'function' && define.amd ? define(['exports'], factory) :
|
|
(global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.setArray = {}));
|
|
})(this, (function (exports) { 'use strict';
|
|
|
|
/**
|
|
* Gets the index associated with `key` in the backing array, if it is already present.
|
|
*/
|
|
exports.get = void 0;
|
|
/**
|
|
* Puts `key` into the backing array, if it is not already present. Returns
|
|
* the index of the `key` in the backing array.
|
|
*/
|
|
exports.put = void 0;
|
|
/**
|
|
* Pops the last added item out of the SetArray.
|
|
*/
|
|
exports.pop = void 0;
|
|
/**
|
|
* SetArray acts like a `Set` (allowing only one occurrence of a string `key`), but provides the
|
|
* index of the `key` in the backing array.
|
|
*
|
|
* This is designed to allow synchronizing a second array with the contents of the backing array,
|
|
* like how in a sourcemap `sourcesContent[i]` is the source content associated with `source[i]`,
|
|
* and there are never duplicates.
|
|
*/
|
|
class SetArray {
|
|
constructor() {
|
|
this._indexes = { __proto__: null };
|
|
this.array = [];
|
|
}
|
|
}
|
|
(() => {
|
|
exports.get = (strarr, key) => strarr._indexes[key];
|
|
exports.put = (strarr, key) => {
|
|
// The key may or may not be present. If it is present, it's a number.
|
|
const index = exports.get(strarr, key);
|
|
if (index !== undefined)
|
|
return index;
|
|
const { array, _indexes: indexes } = strarr;
|
|
return (indexes[key] = array.push(key) - 1);
|
|
};
|
|
exports.pop = (strarr) => {
|
|
const { array, _indexes: indexes } = strarr;
|
|
if (array.length === 0)
|
|
return;
|
|
const last = array.pop();
|
|
indexes[last] = undefined;
|
|
};
|
|
})();
|
|
|
|
exports.SetArray = SetArray;
|
|
|
|
Object.defineProperty(exports, '__esModule', { value: true });
|
|
|
|
}));
|
|
//# sourceMappingURL=set-array.umd.js.map
|