'use strict';
/**
* Various utility functions used throughout Mocha's codebase.
* @module utils
*/
/**
* Module dependencies.
*/
var path = require('path');
var util = require('util');
var he = require('he');
const MOCHA_ID_PROP_NAME = '__mocha_id__';
/**
* Inherit the prototype methods from one constructor into another.
*
* @param {function} ctor - Constructor function which needs to inherit the
* prototype.
* @param {function} superCtor - Constructor function to inherit prototype from.
* @throws {TypeError} if either constructor is null, or if super constructor
* lacks a prototype.
*/
exports.inherits = util.inherits;
/**
* Escape special characters in the given string of html.
*
* @private
* @param {string} html
* @return {string}
*/
exports.escape = function (html) {
return he.encode(String(html), {useNamedReferences: false});
};
/**
* Test if the given obj is type of string.
*
* @private
* @param {Object} obj
* @return {boolean}
*/
exports.isString = function (obj) {
return typeof obj === 'string';
};
/**
* Compute a slug from the given `str`.
*
* @private
* @param {string} str
* @return {string}
*/
exports.slug = function (str) {
return str
.toLowerCase()
.replace(/\s+/g, '-')
.replace(/[^-\w]/g, '')
.replace(/-{2,}/g, '-');
};
/**
* Strip the function definition from `str`, and re-indent for pre whitespace.
*
* @param {string} str
* @return {string}
*/
exports.clean = function (str) {
str = str
.replace(/\r\n?|[\n\u2028\u2029]/g, '\n')
.replace(/^\uFEFF/, '')
// (traditional)-> space/name parameters body (lambda)-> parameters body multi-statement/single keep body content
.replace(
/^function(?:\s*|\s[^(]*)\([^)]*\)\s*\{((?:.|\n)*?)\}$|^\([^)]*\)\s*=>\s*(?:\{((?:.|\n)*?)\}|((?:.|\n)*))$/,
'$1$2$3'
);
var spaces = str.match(/^\n?( *)/)[1].length;
var tabs = str.match(/^\n?(\t*)/)[1].length;
var re = new RegExp(
'^\n?' + (tabs ? '\t' : ' ') + '{' + (tabs || spaces) + '}',
'gm'
);
str = str.replace(re, '');
return str.trim();
};
/**
* If a value could have properties, and has none, this function is called,
* which returns a string representation of the empty value.
*
* Functions w/ no properties return `'[Function]'`
* Arrays w/ length === 0 return `'[]'`
* Objects w/ no properties return `'{}'`
* All else: return result of `value.toString()`
*
* @private
* @param {*} value The value to inspect.
* @param {string} typeHint The type of the value
* @returns {string}
*/
function emptyRepresentation(value, typeHint) {
switch (typeHint) {
case 'function':
return '[Function]';
case 'object':
return '{}';
case 'array':
return '[]';
default:
return value.toString();
}
}
/**
* Takes some variable and asks `Object.prototype.toString()` what it thinks it
* is.
*
* @private
* @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/toString
* @param {*} value The value to test.
* @returns {string} Computed type
* @example
* canonicalType({}) // 'object'
* canonicalType([]) // 'array'
* canonicalType(1) // 'number'
* canonicalType(false) // 'boolean'
* canonicalType(Infinity) // 'number'
* canonicalType(null) // 'null'
* canonicalType(new Date()) // 'date'
* canonicalType(/foo/) // 'regexp'
* canonicalType('type') // 'string'
* canonicalType(global) // 'global'
* canonicalType(new String('foo') // 'object'
* canonicalType(async function() {}) // 'asyncfunction'
* canonicalType(Object.create(null)) // 'null-prototype'
*/
var canonicalType = (exports.canonicalType = function canonicalType(value) {
if (value === undefined) {
return 'undefined';
} else if (value === null) {
return 'null';
} else if (Buffer.isBuffer(value)) {
return 'buffer';
} else if (Object.getPrototypeOf(value) === null) {
return 'null-prototype';
}
return Object.prototype.toString
.call(value)
.replace(/^\[.+\s(.+?)]$/, '$1')
.toLowerCase();
});
/**
*
* Returns a general type or data structure of a variable
* @private
* @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures
* @param {*} value The value to test.
* @returns {string} One of undefined, boolean, number, string, bigint, symbol, object
* @example
* type({}) // 'object'
* type([]) // 'array'
* type(1) // 'number'
* type(false) // 'boolean'
* type(Infinity) // 'number'
* type(null) // 'null'
* type(new Date()) // 'object'
* type(/foo/) // 'object'
* type('type') // 'string'
* type(global) // 'object'
* type(new String('foo') // 'string'
*/
exports.type = function type(value) {
// Null is special
if (value === null) return 'null';
const primitives = new Set([
'undefined',
'boolean',
'number',
'string',
'bigint',
'symbol'
]);
const _type = typeof value;
if (_type === 'function') return _type;
if (primitives.has(_type)) return _type;
if (value instanceof String) return 'string';
if (value instanceof Error) return 'error';
if (Array.isArray(value)) return 'array';
return _type;
};
/**
* Stringify `value`. Different behavior depending on type of value:
*
* - If `value` is undefined or null, return `'[undefined]'` or `'[null]'`, respectively.
* - If `value` is not an object, function or array, return result of `value.toString()` wrapped in double-quotes.
* - If `value` is an *empty* object, function, or array, return result of function
* {@link emptyRepresentation}.
* - If `value` has properties, call {@link exports.canonicalize} on it, then return result of
* JSON.stringify().
*
* @private
* @see exports.type
* @param {*} value
* @return {string}
*/
exports.stringify = function (value) {
var typeHint = canonicalType(value);
if (!~['object', 'array', 'function', 'null-prototype'].indexOf(typeHint)) {
if (typeHint === 'buffer') {
var json = Buffer.prototype.toJSON.call(value);
// Based on the toJSON result
return jsonStringify(
json.data && json.type ? json.data : json,
2
).replace(/,(\n|$)/g, '$1');
}
// IE7/IE8 has a bizarre String constructor; needs to be coerced
// into an array and back to obj.
if (typeHint === 'string' && typeof value === 'object') {
value = value.split('').reduce(function (acc, char, idx) {
acc[idx] = char;
return acc;
}, {});
typeHint = 'object';
} else {
return jsonStringify(value);
}
}
for (var prop in value) {
if (Object.prototype.hasOwnProperty.call(value, prop)) {
return jsonStringify(
exports.canonicalize(value, null, typeHint),
2
).replace(/,(\n|$)/g, '$1');
}
}
return emptyRepresentation(value, typeHint);
};
/**
* like JSON.stringify but more sense.
*
* @private
* @param {Object} object
* @param {number=} spaces
* @param {number=} depth
* @returns {*}
*/
function jsonStringify(object, spaces, depth) {
if (typeof spaces === 'undefined') {
// primitive types
return _stringify(object);
}
depth = depth || 1;
var space = spaces * depth;
var str = Array.isArray(object) ? '[' : '{';
var end = Array.isArray(object) ? ']' : '}';
var length =
typeof object.length === 'number'
? object.length
: Object.keys(object).length;
// `.repeat()` polyfill
function repeat(s, n) {
return new Array(n).join(s);
}
function _stringify(val) {
switch (canonicalType(val)) {
case 'null':
case 'undefined':
val = '[' + val + ']';
break;
case 'array':
case 'object':
val = jsonStringify(val, spaces, depth + 1);
break;
case 'boolean':
case 'regexp':
case 'symbol':
case 'number':
val =
val === 0 && 1 / val === -Infinity // `-0`
? '-0'
: val.toString();
break;
case 'bigint':
val = val.toString() + 'n';
break;
case 'date':
var sDate = isNaN(val.getTime()) ? val.toString() : val.toISOString();
val = '[Date: ' + sDate + ']';
break;
case 'buffer':
var json = val.toJSON();
// Based on the toJSON result
json = json.data && json.type ? json.data : json;
val = '[Buffer: ' + jsonStringify(json, 2, depth + 1) + ']';
break;
default:
val =
val === '[Function]' || val === '[Circular]'
? val
: JSON.stringify(val); // string
}
return val;
}
for (var i in object) {
if (!Object.prototype.hasOwnProperty.call(object, i)) {
continue; // not my business
}
--length;
str +=
'\n ' +
repeat(' ', space) +
(Array.isArray(object) ? '' : '"' + i + '": ') + // key
_stringify(object[i]) + // value
(length ? ',' : ''); // comma
}
return (
str +
// [], {}
(str.length !== 1 ? '\n' + repeat(' ', --space) + end : end)
);
}
/**
* Return a new Thing that has the keys in sorted order. Recursive.
*
* If the Thing...
* - has already been seen, return string `'[Circular]'`
* - is `undefined`, return string `'[undefined]'`
* - is `null`, return value `null`
* - is some other primitive, return the value
* - is not a primitive or an `Array`, `Object`, or `Function`, return the value of the Thing's `toString()` method
* - is a non-empty `Array`, `Object`, or `Function`, return the result of calling this function again.
* - is an empty `Array`, `Object`, or `Function`, return the result of calling `emptyRepresentation()`
*
* @private
* @see {@link exports.stringify}
* @param {*} value Thing to inspect. May or may not have properties.
* @param {Array} [stack=[]] Stack of seen values
* @param {string} [typeHint] Type hint
* @return {(Object|Array|Function|string|undefined)}
*/
exports.canonicalize = function canonicalize(value, stack, typeHint) {
var canonicalizedObj;
/* eslint-disable no-unused-vars */
var prop;
/* eslint-enable no-unused-vars */
typeHint = typeHint || canonicalType(value);
function withStack(value, fn) {
stack.push(value);
fn();
stack.pop();
}
stack = stack || [];
if (stack.indexOf(value) !== -1) {
return '[Circular]';
}
switch (typeHint) {
case 'undefined':
case 'buffer':
case 'null':
canonicalizedObj = value;
break;
case 'array':
withStack(value, function () {
canonicalizedObj = value.map(function (item) {
return exports.canonicalize(item, stack);
});
});
break;
case 'function':
/* eslint-disable-next-line no-unused-vars, no-unreachable-loop */
for (prop in value) {
canonicalizedObj = {};
break;
}
/* eslint-enable guard-for-in */
if (!canonicalizedObj) {
canonicalizedObj = emptyRepresentation(value, typeHint);
break;
}
/* falls through */
case 'null-prototype':
case 'object':
canonicalizedObj = canonicalizedObj || {};
if (typeHint === 'null-prototype' && Symbol.toStringTag in value) {
canonicalizedObj['[Symbol.toStringTag]'] = value[Symbol.toStringTag];
}
withStack(value, function () {
Object.keys(value)
.sort()
.forEach(function (key) {
canonicalizedObj[key] = exports.canonicalize(value[key], stack);
});
});
break;
case 'date':
case 'number':
case 'regexp':
case 'boolean':
case 'symbol':
canonicalizedObj = value;
break;
default:
canonicalizedObj = value + '';
}
return canonicalizedObj;
};
/**
* @summary
* This Filter based on `mocha-clean` module.(see: `github.com/rstacruz/mocha-clean`)
* @description
* When invoking this function you get a filter function that get the Error.stack as an input,
* and return a prettify output.
* (i.e: strip Mocha and internal node functions from stack trace).
* @returns {Function}
*/
exports.stackTraceFilter = function () {
// TODO: Replace with `process.browser`
var is = typeof document === 'undefined' ? {node: true} : {browser: true};
var slash = path.sep;
var cwd;
if (is.node) {
cwd = exports.cwd() + slash;
} else {
cwd = (
typeof location === 'undefined' ? window.location : location
).href.replace(/\/[^/]*$/, '/');
slash = '/';
}
function isMochaInternal(line) {
return (
~line.indexOf('node_modules' + slash + 'mocha' + slash) ||
~line.indexOf(slash + 'mocha.js') ||
~line.indexOf(slash + 'mocha.min.js')
);
}
function isNodeInternal(line) {
return (
~line.indexOf('(timers.js:') ||
~line.indexOf('(events.js:') ||
~line.indexOf('(node.js:') ||
~line.indexOf('(module.js:') ||
~line.indexOf('GeneratorFunctionPrototype.next (native)') ||
false
);
}
return function (stack) {
stack = stack.split('\n');
stack = stack.reduce(function (list, line) {
if (isMochaInternal(line)) {
return list;
}
if (is.node && isNodeInternal(line)) {
return list;
}
// Clean up cwd(absolute)
if (/:\d+:\d+\)?$/.test(line)) {
line = line.replace('(' + cwd, '(');
}
list.push(line);
return list;
}, []);
return stack.join('\n');
};
};
/**
* Crude, but effective.
* @public
* @param {*} value
* @returns {boolean} Whether or not `value` is a Promise
*/
exports.isPromise = function isPromise(value) {
return (
typeof value === 'object' &&
value !== null &&
typeof value.then === 'function'
);
};
/**
* Clamps a numeric value to an inclusive range.
*
* @param {number} value - Value to be clamped.
* @param {number[]} range - Two element array specifying [min, max] range.
* @returns {number} clamped value
*/
exports.clamp = function clamp(value, range) {
return Math.min(Math.max(value, range[0]), range[1]);
};
/**
* It's a noop.
* @public
*/
exports.noop = function () {};
/**
* Creates a map-like object.
*
* @description
* A "map" is an object with no prototype, for our purposes. In some cases
* this would be more appropriate than a `Map`, especially if your environment
* doesn't support it. Recommended for use in Mocha's public APIs.
*
* @public
* @see {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map#Custom_and_Null_objects|MDN:Map}
* @see {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/create#Custom_and_Null_objects|MDN:Object.create - Custom objects}
* @see {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign#Custom_and_Null_objects|MDN:Object.assign}
* @param {...*} [obj] - Arguments to `Object.assign()`.
* @returns {Object} An object with no prototype, having `...obj` properties
*/
exports.createMap = function (obj) {
return Object.assign.apply(
null,
[Object.create(null)].concat(Array.prototype.slice.call(arguments))
);
};
/**
* Creates a read-only map-like object.
*
* @description
* This differs from {@link module:utils.createMap createMap} only in that
* the argument must be non-empty, because the result is frozen.
*
* @see {@link module:utils.createMap createMap}
* @param {...*} [obj] - Arguments to `Object.assign()`.
* @returns {Object} A frozen object with no prototype, having `...obj` properties
* @throws {TypeError} if argument is not a non-empty object.
*/
exports.defineConstants = function (obj) {
if (canonicalType(obj) !== 'object' || !Object.keys(obj).length) {
throw new TypeError('Invalid argument; expected a non-empty object');
}
return Object.freeze(exports.createMap(obj));
};
/**
* Returns current working directory
*
* Wrapper around `process.cwd()` for isolation
* @private
*/
exports.cwd = function cwd() {
return process.cwd();
};
/**
* Returns `true` if Mocha is running in a browser.
* Checks for `process.browser`.
* @returns {boolean}
* @private
*/
exports.isBrowser = function isBrowser() {
return Boolean(process.browser);
};
/*
* Casts `value` to an array; useful for optionally accepting array parameters
*
* It follows these rules, depending on `value`. If `value` is...
* 1. `undefined`: return an empty Array
* 2. `null`: return an array with a single `null` element
* 3. Any other object: return the value of `Array.from()` _if_ the object is iterable
* 4. otherwise: return an array with a single element, `value`
* @param {*} value - Something to cast to an Array
* @returns {Array<*>}
*/
exports.castArray = function castArray(value) {
if (value === undefined) {
return [];
}
if (value === null) {
return [null];
}
if (
typeof value === 'object' &&
(typeof value[Symbol.iterator] === 'function' || value.length !== undefined)
) {
return Array.from(value);
}
return [value];
};
exports.constants = exports.defineConstants({
MOCHA_ID_PROP_NAME
});
const uniqueIDBase =
'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_';
/**
* Creates a new unique identifier
* Does not create cryptographically safe ids.
* Trivial copy of nanoid/non-secure
* @returns {string} Unique identifier
*/
exports.uniqueID = () => {
let id = '';
for (let i = 0; i < 21; i++) {
id += uniqueIDBase[(Math.random() * 64) | 0];
}
return id;
};
exports.assignNewMochaID = obj => {
const id = exports.uniqueID();
Object.defineProperty(obj, MOCHA_ID_PROP_NAME, {
get() {
return id;
}
});
return obj;
};
/**
* Retrieves a Mocha ID from an object, if present.
* @param {*} [obj] - Object
* @returns {string|void}
*/
exports.getMochaID = obj =>
obj && typeof obj === 'object' ? obj[MOCHA_ID_PROP_NAME] : undefined;
/**
* Replaces any detected circular dependency with the string '[Circular]'
* Mutates original object
* @param inputObj {*}
* @returns {*}
*/
exports.breakCircularDeps = inputObj => {
const seen = new Set();
function _breakCircularDeps(obj) {
if (obj && typeof obj !== 'object') {
return obj;
}
if (seen.has(obj)) {
return '[Circular]';
}
seen.add(obj);
for (const k in obj) {
const descriptor = Object.getOwnPropertyDescriptor(obj, k);
if (descriptor && descriptor.writable) {
obj[k] = _breakCircularDeps(obj[k], k);
}
}
// deleting means only a seen object that is its own child will be detected
seen.delete(obj);
return obj;
}
return _breakCircularDeps(inputObj);
};