unexpected
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JavaScript
// Copyright (c) 2013 Sune Simonsen <sune@we-knowhow.dk>
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the 'Software'), to deal in the Software without
// restriction, including without limitation the rights to use, copy,
// modify, merge, publish, distribute, sublicense, and/or sell copies
// of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
// BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
var root = this;
(function () {
function Assertion(subject, testDescription, flags, args) {
this.obj = subject;
this.testDescription = testDescription;
this.flags = flags;
this.args = args;
}
Assertion.prototype.throwStandardError = function () {
var that = this;
var argsString = map(this.args, function (arg) {
return inspect(arg);
}).join(', ');
if (argsString.length > 0) {
argsString = ' ' + argsString;
}
throw new Error('expected ' +
inspect(this.obj) +
' ' + this.testDescription +
argsString);
};
Assertion.prototype.assert = function (condition) {
var that = this;
var not = !!this.flags.not;
condition = !!condition;
if (condition === not) {
this.throwStandardError();
}
};
function AssertionRule(pattern, handler) {
var regExpString = pattern
.replace(/\(/g, '(:?')
.replace(/\[([^\]]+)\] /g, function (match, flag) {
return '(?:(' + flag + ') )?';
});
this.regexp = new RegExp('^' + regExpString + '$');
this.handler = handler;
}
AssertionRule.prototype.test = function (text) {
return this.regexp.test(text);
};
AssertionRule.prototype.getFlags = function (text) {
var match = this.regexp.exec(text);
var flags = {};
for (var i = 1; i < match.length; i += 1) {
var flag = match[i];
if (flag !== undefined) {
flags[flag] = true;
}
}
return flags;
};
var assertions = [];
function expect(subject, testDescriptionString) {
var matching = assertions.filter(function (assertionRule) {
return assertionRule.test(testDescriptionString);
});
if (matching.length > 0) {
var assertionRule = matching[0];
var flags = assertionRule.getFlags(testDescriptionString);
var args = Array.prototype.slice.call(arguments, 2);
var assertion = new Assertion(subject, testDescriptionString, flags, args);
var handler = assertionRule.handler;
handler.apply(assertion, args);
} else {
throw new Error('Unknown assertion "' + testDescriptionString + '"');
}
}
expect.format = function (message, args) {
args = map(args, function (arg) {
return inspect(arg);
});
message = message.replace(/\{(\d+)\}/g, function (match, n) {
return args[n] || match;
});
return message;
};
expect.fail = function (message) {
message = message || "explicit failure";
var args = Array.prototype.slice.call(arguments, 1);
throw new Error(expect.format(message, args));
};
expect.assertions = assertions;
expect.addAssertion = function (pattern, handler) {
assertions.push(new AssertionRule(pattern, handler));
};
expect.addAssertion('to [not] be', function (value) {
this.assert(this.obj === value);
});
expect.addAssertion('to [not] be (ok|truthy)', function () {
this.assert(this.obj);
});
expect.addAssertion('to [not] be falsy', function () {
this.assert(!this.obj);
});
expect.addAssertion('to [not] be (a|an)', function (type) {
var subject = this.obj;
if ('string' === typeof type) {
// typeof with support for 'array'
this.assert(
'array' === type ? isArray(subject) :
'object' === type ?
'object' === typeof subject && null !== subject :
type === typeof subject);
} else {
this.assert(subject instanceof type);
}
return this;
});
expect.addAssertion('to [not] match', function (regexp) {
this.assert(regexp.exec(this.obj));
});
expect.addAssertion('to [not] have [own] property', function (key, value) {
if (!this.obj) {
this.throwStandardError();
}
if (this.flags.own) {
this.assert(this.obj.hasOwnProperty(key));
} else {
this.assert(this.obj[key] !== undefined);
}
if (arguments.length === 2) {
this.flags.not = false;
this.assert(this.obj[key] === value);
}
});
expect.addAssertion('to [not] have length', function (length) {
if (!this.obj || typeof this.obj.length !== 'number') {
this.throwStandardError();
}
this.assert(length === this.obj.length);
});
expect.addAssertion('to [not] be empty', function () {
var type = typeof this.obj;
if (this.obj && 'number' === typeof this.obj.length) {
this.assert(!this.obj.length);
} else if (isArray(this.obj) || typeof this.obj === 'string') {
this.assert(this.obj.length === 0);
} else if (this.obj && typeof this.obj === 'object') {
this.assert(!getKeys(this.obj).length);
} else {
throw new Error("Assertion '" + this.testDescription +
"' only supports strings, arrays and objects");
}
});
expect.addAssertion('to [not] [only] have (key|keys)', function (keys) {
var obj = this.obj;
keys = isArray(keys) ?
keys :
Array.prototype.slice.call(arguments);
var hasKeys = obj && every(keys, function (key) {
return obj.hasOwnProperty(key);
});
if (this.flags.only) {
this.assert(hasKeys && getKeys(obj).length === keys.length);
} else {
this.assert(hasKeys);
}
});
expect.addAssertion('to [not] contain', function (arg) {
if ('string' === typeof this.obj) {
this.assert(this.obj.indexOf(arg) !== -1);
} else {
this.assert(this.obj && indexOf(this.obj, arg) !== -1);
}
});
expect.addAssertion('to [not] be within', function (start, finish) {
this.args = [start + '..' + finish];
if (typeof this.obj !== 'number') {
this.throwStandardError();
}
this.assert(this.obj >= start && this.obj <= finish);
});
expect.addAssertion('(<|to be (<|less than|below))', function (value) {
this.assert(this.obj < value);
});
expect.addAssertion('(<=|to be (<=|less than or equals to))', function (value) {
this.assert(this.obj <= value);
});
expect.addAssertion('(>|to be (>|greater than|above))', function (value) {
this.assert(this.obj > value);
});
expect.addAssertion('(>=|to be (>=|greater than or equals to))', function (value) {
this.assert(this.obj >= value);
});
expect.addAssertion('to be positive', function () {
this.assert(this.obj > 0);
});
expect.addAssertion('to be negative', function () {
this.assert(this.obj < 0);
});
expect.addAssertion('to [not] equal', function (value) {
this.assert(expect.eql(value, this.obj));
});
expect.addAssertion('to [not] throw (error|exception)', function (fn) {
if (typeof this.obj !== 'function') {
throw new Error("Assertion '" + this.testDescription +
"' only supports functions");
}
var thrown = false;
var not = this.flags.not;
try {
this.obj();
} catch (e) {
var subject = 'string' === typeof e ? e : e.message;
if ('function' === typeof fn) {
fn(e);
} else if ('object' === typeof fn) {
if (not) {
expect(subject, 'to not match', fn);
} else {
expect(subject, 'to match', fn);
}
} else if ('string' === typeof fn) {
if (not) {
expect(subject, 'to not be', fn);
} else {
expect(subject, 'to be', fn);
}
}
thrown = true;
}
if ('function' !== typeof fn && not) {
// in the presence of a matcher, ensure the `not` only applies to
// the matching.
this.flags.not = false;
}
this.assert(thrown);
});
Assertion.prototype.inspect = inspect;
expect.inspect = inspect;
Assertion.prototype.eql = eql;
expect.eql = eql;
///////////////////////// Helper functions ///////////////////////////////
function bind(fn, scope) {
return function () {
return fn.apply(scope, arguments);
};
}
function every (arr, fn, thisObj) {
var scope = thisObj || global;
for (var i = 0, j = arr.length; i < j; ++i) {
if (!fn.call(scope, arr[i], i, arr)) {
return false;
}
}
return true;
}
function indexOf (arr, o, i) {
if (Array.prototype.indexOf) {
return Array.prototype.indexOf.call(arr, o, i);
}
if (arr.length === undefined) {
return -1;
}
for (var j = arr.length, i = i < 0 ? i + j < 0 ? 0 : i + j : i || 0;
i < j && arr[i] !== o; i++);
return j <= i ? -1 : i;
}
// https://gist.github.com/1044128/
var getOuterHTML = function(element) {
if ('outerHTML' in element) return element.outerHTML;
var ns = "http://www.w3.org/1999/xhtml";
var container = document.createElementNS(ns, '_');
var elemProto = (window.HTMLElement || window.Element).prototype;
var xmlSerializer = new XMLSerializer();
var html;
if (document.xmlVersion) {
return xmlSerializer.serializeToString(element);
} else {
container.appendChild(element.cloneNode(false));
html = container.innerHTML.replace('><', '>' + element.innerHTML + '<');
container.innerHTML = '';
return html;
}
};
// Returns true if object is a DOM element.
var isDOMElement = function (object) {
if (typeof HTMLElement === 'object') {
return object instanceof HTMLElement;
} else {
return object &&
typeof object === 'object' &&
object.nodeType === 1 &&
typeof object.nodeName === 'string';
}
};
/**
* Inspects an object.
*
* @see taken from node.js `util` module (copyright Joyent, MIT license)
*/
function inspect(obj, showHidden, depth) {
var seen = [];
function stylize (str) {
return str;
}
function format (value, recurseTimes) {
// Provide a hook for user-specified inspect functions.
// Check that value is an object with an inspect function on it
if (value && typeof value.inspect === 'function' &&
// Filter out the util module, it's inspect function is special
value !== exports &&
// Also filter out any prototype objects using the circular check.
!(value.constructor && value.constructor.prototype === value)) {
return value.inspect(recurseTimes);
}
// Primitive types cannot have properties
switch (typeof value) {
case 'undefined':
return stylize('undefined', 'undefined');
case 'string':
var simple = '\'' + json.stringify(value).replace(/^"|"$/g, '')
.replace(/'/g, "\\'")
.replace(/\\"/g, '"') + '\'';
return stylize(simple, 'string');
case 'number':
return stylize('' + value, 'number');
case 'boolean':
return stylize('' + value, 'boolean');
}
// For some reason typeof null is "object", so special case here.
if (value === null) {
return stylize('null', 'null');
}
if (isDOMElement(value)) {
return getOuterHTML(value);
}
if (isRegExp(value)) {
return stylize('' + value, 'regexp');
}
// Look up the keys of the object.
var visible_keys = getKeys(value);
var $keys = showHidden ? Object.getOwnPropertyNames(value) : visible_keys;
// Functions without properties can be shortcutted.
if (typeof value === 'function' && $keys.length === 0) {
if (isRegExp(value)) {
return stylize('' + value, 'regexp');
} else {
var name = value.name ? ': ' + value.name : '';
return stylize('[Function' + name + ']', 'special');
}
}
// Dates without properties can be shortcutted
if (isDate(value) && $keys.length === 0) {
return stylize(value.toUTCString(), 'date');
}
var base, type, braces;
// Determine the object type
if (isArray(value)) {
type = 'Array';
braces = ['[', ']'];
} else {
type = 'Object';
braces = ['{', '}'];
}
// Make functions say that they are functions
if (typeof value === 'function') {
var n = value.name ? ': ' + value.name : '';
base = (isRegExp(value)) ? ' ' + value : ' [Function' + n + ']';
} else {
base = '';
}
// Make dates with properties first say the date
if (isDate(value)) {
base = ' ' + value.toUTCString();
}
if ($keys.length === 0) {
return braces[0] + base + braces[1];
}
if (recurseTimes < 0) {
if (isRegExp(value)) {
return stylize('' + value, 'regexp');
} else {
return stylize('[Object]', 'special');
}
}
seen.push(value);
var output = map($keys, function (key) {
var name, str;
if (value.__lookupGetter__) {
if (value.__lookupGetter__(key)) {
if (value.__lookupSetter__(key)) {
str = stylize('[Getter/Setter]', 'special');
} else {
str = stylize('[Getter]', 'special');
}
} else {
if (value.__lookupSetter__(key)) {
str = stylize('[Setter]', 'special');
}
}
}
if (indexOf(visible_keys, key) < 0) {
name = '[' + key + ']';
}
if (!str) {
if (indexOf(seen, value[key]) < 0) {
if (recurseTimes === null) {
str = format(value[key]);
} else {
str = format(value[key], recurseTimes - 1);
}
if (str.indexOf('\n') > -1) {
if (isArray(value)) {
str = map(str.split('\n'), function (line) {
return ' ' + line;
}).join('\n').substr(2);
} else {
str = '\n' + map(str.split('\n'), function (line) {
return ' ' + line;
}).join('\n');
}
}
} else {
str = stylize('[Circular]', 'special');
}
}
if (typeof name === 'undefined') {
if (type === 'Array' && key.match(/^\d+$/)) {
return str;
}
name = json.stringify('' + key);
if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
name = name.substr(1, name.length - 2);
name = stylize(name, 'name');
} else {
name = name.replace(/'/g, "\\'")
.replace(/\\"/g, '"')
.replace(/(^"|"$)/g, "'");
name = stylize(name, 'string');
}
}
return name + ': ' + str;
});
seen.pop();
var numLinesEst = 0;
var length = reduce(output, function (prev, cur) {
numLinesEst++;
if (indexOf(cur, '\n') >= 0) numLinesEst++;
return prev + cur.length + 1;
}, 0);
if (length > 50) {
output = braces[0] +
(base === '' ? '' : base + '\n ') +
' ' +
output.join(',\n ') +
' ' +
braces[1];
} else {
output = braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
}
return output;
}
return format(obj, (typeof depth === 'undefined' ? 2 : depth));
}
function isArray (ar) {
return Object.prototype.toString.call(ar) == '[object Array]';
}
function isRegExp(re) {
var s;
try {
s = '' + re;
} catch (e) {
return false;
}
return re instanceof RegExp || // easy case
// duck-type for context-switching evalcx case
typeof(re) === 'function' &&
re.constructor.name === 'RegExp' &&
re.compile &&
re.test &&
re.exec &&
s.match(/^\/.*\/[gim]{0,3}$/);
}
function isDate(d) {
if (d instanceof Date) return true;
return false;
}
function getKeys(obj) {
if (Object.keys) {
return Object.keys(obj);
}
var result = [];
for (var i in obj) {
if (Object.prototype.hasOwnProperty.call(obj, i)) {
result.push(i);
}
}
return result;
}
function map(arr, mapper, that) {
if (Array.prototype.map) {
return Array.prototype.map.call(arr, mapper, that);
}
var other= new Array(arr.length);
for (var i= 0, n = arr.length; i<n; i++)
if (i in arr)
other[i] = mapper.call(that, arr[i], i, arr);
return other;
}
function reduce (arr, fun) {
if (Array.prototype.reduce) {
return Array.prototype.reduce.apply(
arr, Array.prototype.slice.call(arguments, 1)
);
}
var len = +this.length;
if (typeof fun !== "function")
throw new TypeError();
// no value to return if no initial value and an empty array
if (len === 0 && arguments.length === 1)
throw new TypeError();
var i = 0;
var rv;
if (arguments.length >= 2) {
rv = arguments[1];
} else {
do {
if (i in this) {
rv = this[i++];
break;
}
// if array contains no values, no initial value to return
if (++i >= len)
throw new TypeError();
} while (true);
}
for (; i < len; i++) {
if (i in this)
rv = fun.call(null, rv, this[i], i, this);
}
return rv;
}
/**
* Asserts deep equality
*
* @see taken from node.js `assert` module (copyright Joyent, MIT license)
*/
function eql(actual, expected) {
// 7.1. All identical values are equivalent, as determined by ===.
if (actual === expected) {
return true;
} else if ('undefined' != typeof Buffer &&
Buffer.isBuffer(actual) && Buffer.isBuffer(expected)) {
if (actual.length != expected.length) return false;
for (var i = 0; i < actual.length; i++) {
if (actual[i] !== expected[i]) return false;
}
return true;
// 7.2. If the expected value is a Date object, the actual value is
// equivalent if it is also a Date object that refers to the same time.
} else if (actual instanceof Date && expected instanceof Date) {
return actual.getTime() === expected.getTime();
// 7.3. Other pairs that do not both pass typeof value == "object",
// equivalence is determined by ==.
} else if (typeof actual != 'object' && typeof expected != 'object') {
return actual == expected;
// 7.4. For all other Object pairs, including Array objects, equivalence is
// determined by having the same number of owned properties (as verified
// with Object.prototype.hasOwnProperty.call), the same set of keys
// (although not necessarily the same order), equivalent values for every
// corresponding key, and an identical "prototype" property. Note: this
// accounts for both named and indexed properties on Arrays.
} else {
return objEquiv(actual, expected);
}
}
function isUndefinedOrNull (value) {
return value === null || value === undefined;
}
function isArguments (object) {
return Object.prototype.toString.call(object) == '[object Arguments]';
}
function objEquiv (a, b) {
if (isUndefinedOrNull(a) || isUndefinedOrNull(b))
return false;
// an identical "prototype" property.
if (a.prototype !== b.prototype) return false;
//~~~I've managed to break Object.keys through screwy arguments passing.
// Converting to array solves the problem.
if (isArguments(a)) {
if (!isArguments(b)) {
return false;
}
a = pSlice.call(a);
b = pSlice.call(b);
return expect.eql(a, b);
}
var ka, kb, key, i;
try{
ka = getKeys(a);
kb = getKeys(b);
} catch (e) {//happens when one is a string literal and the other isn't
return false;
}
// having the same number of owned properties (keys incorporates hasOwnProperty)
if (ka.length != kb.length)
return false;
//the same set of keys (although not necessarily the same order),
ka.sort();
kb.sort();
//~~~cheap key test
for (i = ka.length - 1; i >= 0; i--) {
if (ka[i] != kb[i])
return false;
}
//equivalent values for every corresponding key, and
//~~~possibly expensive deep test
for (i = ka.length - 1; i >= 0; i--) {
key = ka[i];
if (!eql(a[key], b[key]))
return false;
}
return true;
}
var json = (function () {
"use strict";
if ('object' == typeof JSON && JSON.parse && JSON.stringify) {
return {
parse: JSON.parse,
stringify: JSON.stringify
};
}
var JSON = {};
function f(n) {
// Format integers to have at least two digits.
return n < 10 ? '0' + n : n;
}
function date(d, key) {
return isFinite(d.valueOf()) ?
d.getUTCFullYear() + '-' +
f(d.getUTCMonth() + 1) + '-' +
f(d.getUTCDate()) + 'T' +
f(d.getUTCHours()) + ':' +
f(d.getUTCMinutes()) + ':' +
f(d.getUTCSeconds()) + 'Z' : null;
}
var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
gap,
indent,
meta = { // table of character substitutions
'\b': '\\b',
'\t': '\\t',
'\n': '\\n',
'\f': '\\f',
'\r': '\\r',
'"' : '\\"',
'\\': '\\\\'
},
rep;
function quote(string) {
// If the string contains no control characters, no quote characters, and no
// backslash characters, then we can safely slap some quotes around it.
// Otherwise we must also replace the offending characters with safe escape
// sequences.
escapable.lastIndex = 0;
return escapable.test(string) ? '"' + string.replace(escapable, function (a) {
var c = meta[a];
return typeof c === 'string' ? c :
'\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
}) + '"' : '"' + string + '"';
}
function str(key, holder) {
// Produce a string from holder[key].
var i, // The loop counter.
k, // The member key.
v, // The member value.
length,
mind = gap,
partial,
value = holder[key];
// If the value has a toJSON method, call it to obtain a replacement value.
if (value instanceof Date) {
value = date(key);
}
// If we were called with a replacer function, then call the replacer to
// obtain a replacement value.
if (typeof rep === 'function') {
value = rep.call(holder, key, value);
}
// What happens next depends on the value's type.
switch (typeof value) {
case 'string':
return quote(value);
case 'number':
// JSON numbers must be finite. Encode non-finite numbers as null.
return isFinite(value) ? String(value) : 'null';
case 'boolean':
case 'null':
// If the value is a boolean or null, convert it to a string. Note:
// typeof null does not produce 'null'. The case is included here in
// the remote chance that this gets fixed someday.
return String(value);
// If the type is 'object', we might be dealing with an object or an array or
// null.
case 'object':
// Due to a specification blunder in ECMAScript, typeof null is 'object',
// so watch out for that case.
if (!value) {
return 'null';
}
// Make an array to hold the partial results of stringifying this object value.
gap += indent;
partial = [];
// Is the value an array?
if (Object.prototype.toString.apply(value) === '[object Array]') {
// The value is an array. Stringify every element. Use null as a placeholder
// for non-JSON values.
length = value.length;
for (i = 0; i < length; i += 1) {
partial[i] = str(i, value) || 'null';
}
// Join all of the elements together, separated with commas, and wrap them in
// brackets.
v = partial.length === 0 ? '[]' : gap ?
'[\n' + gap + partial.join(',\n' + gap) + '\n' + mind + ']' :
'[' + partial.join(',') + ']';
gap = mind;
return v;
}
// If the replacer is an array, use it to select the members to be stringified.
if (rep && typeof rep === 'object') {
length = rep.length;
for (i = 0; i < length; i += 1) {
if (typeof rep[i] === 'string') {
k = rep[i];
v = str(k, value);
if (v) {
partial.push(quote(k) + (gap ? ': ' : ':') + v);
}
}
}
} else {
// Otherwise, iterate through all of the keys in the object.
for (k in value) {
if (Object.prototype.hasOwnProperty.call(value, k)) {
v = str(k, value);
if (v) {
partial.push(quote(k) + (gap ? ': ' : ':') + v);
}
}
}
}
// Join all of the member texts together, separated with commas,
// and wrap them in braces.
v = partial.length === 0 ? '{}' : gap ?
'{\n' + gap + partial.join(',\n' + gap) + '\n' + mind + '}' :
'{' + partial.join(',') + '}';
gap = mind;
return v;
}
}
// If the JSON object does not yet have a stringify method, give it one.
JSON.stringify = function (value, replacer, space) {
// The stringify method takes a value and an optional replacer, and an optional
// space parameter, and returns a JSON text. The replacer can be a function
// that can replace values, or an array of strings that will select the keys.
// A default replacer method can be provided. Use of the space parameter can
// produce text that is more easily readable.
var i;
gap = '';
indent = '';
// If the space parameter is a number, make an indent string containing that
// many spaces.
if (typeof space === 'number') {
for (i = 0; i < space; i += 1) {
indent += ' ';
}
// If the space parameter is a string, it will be used as the indent string.
} else if (typeof space === 'string') {
indent = space;
}
// If there is a replacer, it must be a function or an array.
// Otherwise, throw an error.
rep = replacer;
if (replacer && typeof replacer !== 'function' &&
(typeof replacer !== 'object' ||
typeof replacer.length !== 'number')) {
throw new Error('JSON.stringify');
}
// Make a fake root object containing our value under the key of ''.
// Return the result of stringifying the value.
return str('', {'': value});
};
// If the JSON object does not yet have a parse method, give it one.
JSON.parse = function (text, reviver) {
// The parse method takes a text and an optional reviver function, and returns
// a JavaScript value if the text is a valid JSON text.
var j;
function walk(holder, key) {
// The walk method is used to recursively walk the resulting structure so
// that modifications can be made.
var k, v, value = holder[key];
if (value && typeof value === 'object') {
for (k in value) {
if (Object.prototype.hasOwnProperty.call(value, k)) {
v = walk(value, k);
if (v !== undefined) {
value[k] = v;
} else {
delete value[k];
}
}
}
}
return reviver.call(holder, key, value);
}
// Parsing happens in four stages. In the first stage, we replace certain
// Unicode characters with escape sequences. JavaScript handles many characters
// incorrectly, either silently deleting them, or treating them as line endings.
text = String(text);
cx.lastIndex = 0;
if (cx.test(text)) {
text = text.replace(cx, function (a) {
return '\\u' +
('0000' + a.charCodeAt(0).toString(16)).slice(-4);
});
}
// In the second stage, we run the text against regular expressions that look
// for non-JSON patterns. We are especially concerned with '()' and 'new'
// because they can cause invocation, and '=' because it can cause mutation.
// But just to be safe, we want to reject all unexpected forms.
// We split the second stage into 4 regexp operations in order to work around
// crippling inefficiencies in IE's and Safari's regexp engines. First we
// replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
// replace all simple value tokens with ']' characters. Third, we delete all
// open brackets that follow a colon or comma or that begin the text. Finally,
// we look to see that the remaining characters are only whitespace or ']' or
// ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.
if (/^[\],:{}\s]*$/
.test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@')
.replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']')
.replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {
// In the third stage we use the eval function to compile the text into a
// JavaScript structure. The '{' operator is subject to a syntactic ambiguity
// in JavaScript: it can begin a block or an object literal. We wrap the text
// in parens to eliminate the ambiguity.
j = eval('(' + text + ')');
// In the optional fourth stage, we recursively walk the new structure, passing
// each name/value pair to a reviver function for possible transformation.
return typeof reviver === 'function' ?
walk({'': j}, '') : j;
}
// If the text is not JSON parseable, then a SyntaxError is thrown.
throw new SyntaxError('JSON.parse');
};
return JSON;
})();
//////////////////////////////////////////////////////////////////////////
// Support three module loading scenarios
if (typeof require === 'function' && typeof exports === 'object' && typeof module === 'object') {
// CommonJS/Node.js
module.exports = expect;
exports.expect = expect;
} else if (typeof define === 'function' && define.amd) {
// AMD anonymous module
define(function () {
return expect;
});
} else {
// No module loader (plain <script> tag) - put directly in global namespace
root.weknowhow = {
expect: expect
};
}
}());