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The MIT License (MIT)
Copyright (c) 2014
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.
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equal
=====
[![Build Status](https://travis-ci.org/shouldjs/equal.svg?branch=master)](https://travis-ci.org/shouldjs/equal)
Deep equality comparison implementation for should.js. **Not supported outside of should.js**
Function returns an array of failed equality checks if array is empty it means objects are equal:
```js
> var eq = require('.');
undefined
> var a = {a:1,b:2,c:3,d:4,e:5,f:6,g:7,h:8,i:9,j:10},
... b = {a:1,b:2,c:3,d:4,e:5,f:6,g:7,h:7,i:9,j:10};
undefined
> eq(a, b)
[ EqualityFail {
a: 8,
b: 7,
reason: 'A is not equal to B',
path: [ 'h' ],
showReason: false } ]
>
```
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'use strict';
function _interopDefault (ex) { return (ex && (typeof ex === 'object') && 'default' in ex) ? ex['default'] : ex; }
var t = _interopDefault(require('should-type'));
function format(msg) {
var args = arguments;
for (var i = 1, l = args.length; i < l; i++) {
msg = msg.replace(/%s/, args[i]);
}
return msg;
}
var hasOwnProperty = Object.prototype.hasOwnProperty;
function EqualityFail(a, b, reason, path) {
this.a = a;
this.b = b;
this.reason = reason;
this.path = path;
}
function typeToString(tp) {
return tp.type + (tp.cls ? "(" + tp.cls + (tp.sub ? " " + tp.sub : "") + ")" : "");
}
var PLUS_0_AND_MINUS_0 = "+0 is not equal to -0";
var DIFFERENT_TYPES = "A has type %s and B has type %s";
var EQUALITY = "A is not equal to B";
var EQUALITY_PROTOTYPE = "A and B have different prototypes";
var WRAPPED_VALUE = "A wrapped value is not equal to B wrapped value";
var FUNCTION_SOURCES = "function A is not equal to B by source code value (via .toString call)";
var MISSING_KEY = "%s has no key %s";
var SET_MAP_MISSING_KEY = "Set/Map missing key %s";
var DEFAULT_OPTIONS = {
checkProtoEql: true,
checkSubType: true,
plusZeroAndMinusZeroEqual: true,
collectAllFails: false
};
function setBooleanDefault(property, obj, opts, defaults) {
obj[property] = typeof opts[property] !== "boolean" ? defaults[property] : opts[property];
}
var METHOD_PREFIX = "_check_";
function EQ(opts, a, b, path) {
opts = opts || {};
setBooleanDefault("checkProtoEql", this, opts, DEFAULT_OPTIONS);
setBooleanDefault("plusZeroAndMinusZeroEqual", this, opts, DEFAULT_OPTIONS);
setBooleanDefault("checkSubType", this, opts, DEFAULT_OPTIONS);
setBooleanDefault("collectAllFails", this, opts, DEFAULT_OPTIONS);
this.a = a;
this.b = b;
this._meet = opts._meet || [];
this.fails = opts.fails || [];
this.path = path || [];
}
function ShortcutError(fail) {
this.name = "ShortcutError";
this.message = "fail fast";
this.fail = fail;
}
ShortcutError.prototype = Object.create(Error.prototype);
EQ.checkStrictEquality = function(a, b) {
this.collectFail(a !== b, EQUALITY);
};
EQ.add = function add(type, cls, sub, f) {
var args = Array.prototype.slice.call(arguments);
f = args.pop();
EQ.prototype[METHOD_PREFIX + args.join("_")] = f;
};
EQ.prototype = {
check: function() {
try {
this.check0();
} catch (e) {
if (e instanceof ShortcutError) {
return [e.fail];
}
throw e;
}
return this.fails;
},
check0: function() {
var a = this.a;
var b = this.b;
// equal a and b exit early
if (a === b) {
// check for +0 !== -0;
return this.collectFail(a === 0 && 1 / a !== 1 / b && !this.plusZeroAndMinusZeroEqual, PLUS_0_AND_MINUS_0);
}
var typeA = t(a);
var typeB = t(b);
// if objects has different types they are not equal
if (typeA.type !== typeB.type || typeA.cls !== typeB.cls || typeA.sub !== typeB.sub) {
return this.collectFail(true, format(DIFFERENT_TYPES, typeToString(typeA), typeToString(typeB)));
}
// as types the same checks type specific things
var name1 = typeA.type,
name2 = typeA.type;
if (typeA.cls) {
name1 += "_" + typeA.cls;
name2 += "_" + typeA.cls;
}
if (typeA.sub) {
name2 += "_" + typeA.sub;
}
var f =
this[METHOD_PREFIX + name2] ||
this[METHOD_PREFIX + name1] ||
this[METHOD_PREFIX + typeA.type] ||
this.defaultCheck;
f.call(this, this.a, this.b);
},
collectFail: function(comparison, reason, showReason) {
if (comparison) {
var res = new EqualityFail(this.a, this.b, reason, this.path);
res.showReason = !!showReason;
this.fails.push(res);
if (!this.collectAllFails) {
throw new ShortcutError(res);
}
}
},
checkPlainObjectsEquality: function(a, b) {
// compare deep objects and arrays
// stacks contain references only
//
var meet = this._meet;
var m = this._meet.length;
while (m--) {
var st = meet[m];
if (st[0] === a && st[1] === b) {
return;
}
}
// add `a` and `b` to the stack of traversed objects
meet.push([a, b]);
// TODO maybe something else like getOwnPropertyNames
var key;
for (key in b) {
if (hasOwnProperty.call(b, key)) {
if (hasOwnProperty.call(a, key)) {
this.checkPropertyEquality(key);
} else {
this.collectFail(true, format(MISSING_KEY, "A", key));
}
}
}
// ensure both objects have the same number of properties
for (key in a) {
if (hasOwnProperty.call(a, key)) {
this.collectFail(!hasOwnProperty.call(b, key), format(MISSING_KEY, "B", key));
}
}
meet.pop();
if (this.checkProtoEql) {
//TODO should i check prototypes for === or use eq?
this.collectFail(Object.getPrototypeOf(a) !== Object.getPrototypeOf(b), EQUALITY_PROTOTYPE, true);
}
},
checkPropertyEquality: function(propertyName) {
var _eq = new EQ(this, this.a[propertyName], this.b[propertyName], this.path.concat([propertyName]));
_eq.check0();
},
defaultCheck: EQ.checkStrictEquality
};
EQ.add(t.NUMBER, function(a, b) {
this.collectFail((a !== a && b === b) || (b !== b && a === a) || (a !== b && a === a && b === b), EQUALITY);
});
[t.SYMBOL, t.BOOLEAN, t.STRING].forEach(function(tp) {
EQ.add(tp, EQ.checkStrictEquality);
});
EQ.add(t.FUNCTION, function(a, b) {
// functions are compared by their source code
this.collectFail(a.toString() !== b.toString(), FUNCTION_SOURCES);
// check user properties
this.checkPlainObjectsEquality(a, b);
});
EQ.add(t.OBJECT, t.REGEXP, function(a, b) {
// check regexp flags
var flags = ["source", "global", "multiline", "lastIndex", "ignoreCase", "sticky", "unicode"];
while (flags.length) {
this.checkPropertyEquality(flags.shift());
}
// check user properties
this.checkPlainObjectsEquality(a, b);
});
EQ.add(t.OBJECT, t.DATE, function(a, b) {
//check by timestamp only (using .valueOf)
this.collectFail(+a !== +b, EQUALITY);
// check user properties
this.checkPlainObjectsEquality(a, b);
});
[t.NUMBER, t.BOOLEAN, t.STRING].forEach(function(tp) {
EQ.add(t.OBJECT, tp, function(a, b) {
//primitive type wrappers
this.collectFail(a.valueOf() !== b.valueOf(), WRAPPED_VALUE);
// check user properties
this.checkPlainObjectsEquality(a, b);
});
});
EQ.add(t.OBJECT, function(a, b) {
this.checkPlainObjectsEquality(a, b);
});
[t.ARRAY, t.ARGUMENTS, t.TYPED_ARRAY].forEach(function(tp) {
EQ.add(t.OBJECT, tp, function(a, b) {
this.checkPropertyEquality("length");
this.checkPlainObjectsEquality(a, b);
});
});
EQ.add(t.OBJECT, t.ARRAY_BUFFER, function(a, b) {
this.checkPropertyEquality("byteLength");
this.checkPlainObjectsEquality(a, b);
});
EQ.add(t.OBJECT, t.ERROR, function(a, b) {
this.checkPropertyEquality("name");
this.checkPropertyEquality("message");
this.checkPlainObjectsEquality(a, b);
});
EQ.add(t.OBJECT, t.BUFFER, function(a) {
this.checkPropertyEquality("length");
var l = a.length;
while (l--) {
this.checkPropertyEquality(l);
}
//we do not check for user properties because
//node Buffer have some strange hidden properties
});
function checkMapByKeys(a, b) {
var iteratorA = a.keys();
for (var nextA = iteratorA.next(); !nextA.done; nextA = iteratorA.next()) {
var key = nextA.value;
var hasKey = b.has(key);
this.collectFail(!hasKey, format(SET_MAP_MISSING_KEY, key));
if (hasKey) {
var valueB = b.get(key);
var valueA = a.get(key);
eq(valueA, valueB, this);
}
}
}
function checkSetByKeys(a, b) {
var iteratorA = a.keys();
for (var nextA = iteratorA.next(); !nextA.done; nextA = iteratorA.next()) {
var key = nextA.value;
var hasKey = b.has(key);
this.collectFail(!hasKey, format(SET_MAP_MISSING_KEY, key));
}
}
EQ.add(t.OBJECT, t.MAP, function(a, b) {
this._meet.push([a, b]);
checkMapByKeys.call(this, a, b);
checkMapByKeys.call(this, b, a);
this._meet.pop();
this.checkPlainObjectsEquality(a, b);
});
EQ.add(t.OBJECT, t.SET, function(a, b) {
this._meet.push([a, b]);
checkSetByKeys.call(this, a, b);
checkSetByKeys.call(this, b, a);
this._meet.pop();
this.checkPlainObjectsEquality(a, b);
});
function eq(a, b, opts) {
return new EQ(opts, a, b).check();
}
eq.EQ = EQ;
module.exports = eq;
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import t from 'should-type';
function format(msg) {
var args = arguments;
for (var i = 1, l = args.length; i < l; i++) {
msg = msg.replace(/%s/, args[i]);
}
return msg;
}
var hasOwnProperty = Object.prototype.hasOwnProperty;
function EqualityFail(a, b, reason, path) {
this.a = a;
this.b = b;
this.reason = reason;
this.path = path;
}
function typeToString(tp) {
return tp.type + (tp.cls ? "(" + tp.cls + (tp.sub ? " " + tp.sub : "") + ")" : "");
}
var PLUS_0_AND_MINUS_0 = "+0 is not equal to -0";
var DIFFERENT_TYPES = "A has type %s and B has type %s";
var EQUALITY = "A is not equal to B";
var EQUALITY_PROTOTYPE = "A and B have different prototypes";
var WRAPPED_VALUE = "A wrapped value is not equal to B wrapped value";
var FUNCTION_SOURCES = "function A is not equal to B by source code value (via .toString call)";
var MISSING_KEY = "%s has no key %s";
var SET_MAP_MISSING_KEY = "Set/Map missing key %s";
var DEFAULT_OPTIONS = {
checkProtoEql: true,
checkSubType: true,
plusZeroAndMinusZeroEqual: true,
collectAllFails: false
};
function setBooleanDefault(property, obj, opts, defaults) {
obj[property] = typeof opts[property] !== "boolean" ? defaults[property] : opts[property];
}
var METHOD_PREFIX = "_check_";
function EQ(opts, a, b, path) {
opts = opts || {};
setBooleanDefault("checkProtoEql", this, opts, DEFAULT_OPTIONS);
setBooleanDefault("plusZeroAndMinusZeroEqual", this, opts, DEFAULT_OPTIONS);
setBooleanDefault("checkSubType", this, opts, DEFAULT_OPTIONS);
setBooleanDefault("collectAllFails", this, opts, DEFAULT_OPTIONS);
this.a = a;
this.b = b;
this._meet = opts._meet || [];
this.fails = opts.fails || [];
this.path = path || [];
}
function ShortcutError(fail) {
this.name = "ShortcutError";
this.message = "fail fast";
this.fail = fail;
}
ShortcutError.prototype = Object.create(Error.prototype);
EQ.checkStrictEquality = function(a, b) {
this.collectFail(a !== b, EQUALITY);
};
EQ.add = function add(type, cls, sub, f) {
var args = Array.prototype.slice.call(arguments);
f = args.pop();
EQ.prototype[METHOD_PREFIX + args.join("_")] = f;
};
EQ.prototype = {
check: function() {
try {
this.check0();
} catch (e) {
if (e instanceof ShortcutError) {
return [e.fail];
}
throw e;
}
return this.fails;
},
check0: function() {
var a = this.a;
var b = this.b;
// equal a and b exit early
if (a === b) {
// check for +0 !== -0;
return this.collectFail(a === 0 && 1 / a !== 1 / b && !this.plusZeroAndMinusZeroEqual, PLUS_0_AND_MINUS_0);
}
var typeA = t(a);
var typeB = t(b);
// if objects has different types they are not equal
if (typeA.type !== typeB.type || typeA.cls !== typeB.cls || typeA.sub !== typeB.sub) {
return this.collectFail(true, format(DIFFERENT_TYPES, typeToString(typeA), typeToString(typeB)));
}
// as types the same checks type specific things
var name1 = typeA.type,
name2 = typeA.type;
if (typeA.cls) {
name1 += "_" + typeA.cls;
name2 += "_" + typeA.cls;
}
if (typeA.sub) {
name2 += "_" + typeA.sub;
}
var f =
this[METHOD_PREFIX + name2] ||
this[METHOD_PREFIX + name1] ||
this[METHOD_PREFIX + typeA.type] ||
this.defaultCheck;
f.call(this, this.a, this.b);
},
collectFail: function(comparison, reason, showReason) {
if (comparison) {
var res = new EqualityFail(this.a, this.b, reason, this.path);
res.showReason = !!showReason;
this.fails.push(res);
if (!this.collectAllFails) {
throw new ShortcutError(res);
}
}
},
checkPlainObjectsEquality: function(a, b) {
// compare deep objects and arrays
// stacks contain references only
//
var meet = this._meet;
var m = this._meet.length;
while (m--) {
var st = meet[m];
if (st[0] === a && st[1] === b) {
return;
}
}
// add `a` and `b` to the stack of traversed objects
meet.push([a, b]);
// TODO maybe something else like getOwnPropertyNames
var key;
for (key in b) {
if (hasOwnProperty.call(b, key)) {
if (hasOwnProperty.call(a, key)) {
this.checkPropertyEquality(key);
} else {
this.collectFail(true, format(MISSING_KEY, "A", key));
}
}
}
// ensure both objects have the same number of properties
for (key in a) {
if (hasOwnProperty.call(a, key)) {
this.collectFail(!hasOwnProperty.call(b, key), format(MISSING_KEY, "B", key));
}
}
meet.pop();
if (this.checkProtoEql) {
//TODO should i check prototypes for === or use eq?
this.collectFail(Object.getPrototypeOf(a) !== Object.getPrototypeOf(b), EQUALITY_PROTOTYPE, true);
}
},
checkPropertyEquality: function(propertyName) {
var _eq = new EQ(this, this.a[propertyName], this.b[propertyName], this.path.concat([propertyName]));
_eq.check0();
},
defaultCheck: EQ.checkStrictEquality
};
EQ.add(t.NUMBER, function(a, b) {
this.collectFail((a !== a && b === b) || (b !== b && a === a) || (a !== b && a === a && b === b), EQUALITY);
});
[t.SYMBOL, t.BOOLEAN, t.STRING].forEach(function(tp) {
EQ.add(tp, EQ.checkStrictEquality);
});
EQ.add(t.FUNCTION, function(a, b) {
// functions are compared by their source code
this.collectFail(a.toString() !== b.toString(), FUNCTION_SOURCES);
// check user properties
this.checkPlainObjectsEquality(a, b);
});
EQ.add(t.OBJECT, t.REGEXP, function(a, b) {
// check regexp flags
var flags = ["source", "global", "multiline", "lastIndex", "ignoreCase", "sticky", "unicode"];
while (flags.length) {
this.checkPropertyEquality(flags.shift());
}
// check user properties
this.checkPlainObjectsEquality(a, b);
});
EQ.add(t.OBJECT, t.DATE, function(a, b) {
//check by timestamp only (using .valueOf)
this.collectFail(+a !== +b, EQUALITY);
// check user properties
this.checkPlainObjectsEquality(a, b);
});
[t.NUMBER, t.BOOLEAN, t.STRING].forEach(function(tp) {
EQ.add(t.OBJECT, tp, function(a, b) {
//primitive type wrappers
this.collectFail(a.valueOf() !== b.valueOf(), WRAPPED_VALUE);
// check user properties
this.checkPlainObjectsEquality(a, b);
});
});
EQ.add(t.OBJECT, function(a, b) {
this.checkPlainObjectsEquality(a, b);
});
[t.ARRAY, t.ARGUMENTS, t.TYPED_ARRAY].forEach(function(tp) {
EQ.add(t.OBJECT, tp, function(a, b) {
this.checkPropertyEquality("length");
this.checkPlainObjectsEquality(a, b);
});
});
EQ.add(t.OBJECT, t.ARRAY_BUFFER, function(a, b) {
this.checkPropertyEquality("byteLength");
this.checkPlainObjectsEquality(a, b);
});
EQ.add(t.OBJECT, t.ERROR, function(a, b) {
this.checkPropertyEquality("name");
this.checkPropertyEquality("message");
this.checkPlainObjectsEquality(a, b);
});
EQ.add(t.OBJECT, t.BUFFER, function(a) {
this.checkPropertyEquality("length");
var l = a.length;
while (l--) {
this.checkPropertyEquality(l);
}
//we do not check for user properties because
//node Buffer have some strange hidden properties
});
function checkMapByKeys(a, b) {
var iteratorA = a.keys();
for (var nextA = iteratorA.next(); !nextA.done; nextA = iteratorA.next()) {
var key = nextA.value;
var hasKey = b.has(key);
this.collectFail(!hasKey, format(SET_MAP_MISSING_KEY, key));
if (hasKey) {
var valueB = b.get(key);
var valueA = a.get(key);
eq(valueA, valueB, this);
}
}
}
function checkSetByKeys(a, b) {
var iteratorA = a.keys();
for (var nextA = iteratorA.next(); !nextA.done; nextA = iteratorA.next()) {
var key = nextA.value;
var hasKey = b.has(key);
this.collectFail(!hasKey, format(SET_MAP_MISSING_KEY, key));
}
}
EQ.add(t.OBJECT, t.MAP, function(a, b) {
this._meet.push([a, b]);
checkMapByKeys.call(this, a, b);
checkMapByKeys.call(this, b, a);
this._meet.pop();
this.checkPlainObjectsEquality(a, b);
});
EQ.add(t.OBJECT, t.SET, function(a, b) {
this._meet.push([a, b]);
checkSetByKeys.call(this, a, b);
checkSetByKeys.call(this, b, a);
this._meet.pop();
this.checkPlainObjectsEquality(a, b);
});
function eq(a, b, opts) {
return new EQ(opts, a, b).check();
}
eq.EQ = EQ;
export default eq;
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{
"name": "should-equal",
"version": "2.0.0",
"description": "Deep comparison of 2 instances for should.js",
"main": "cjs/should-equal.js",
"jsnext:main": "es6/should-equal.js",
"module": "es6/should-equal.js",
"scripts": {
"test": "mocha --ui bdd -R mocha-better-spec-reporter test.js",
"cjs": "rollup --format=cjs --output=cjs/should-equal.js index.js",
"es6": "rollup --format=es --output=es6/should-equal.js index.js",
"build": "npm run cjs && npm run es6",
"prepare": "npm run build",
"pretest": "npm run build"
},
"repository": {
"type": "git",
"url": "https://github.com/shouldjs/equal.git"
},
"keywords": ["should.js", "deep", "equal"],
"author": "Denis Bardadym <bardadymchik@gmail.com>",
"license": "MIT",
"bugs": {
"url": "https://github.com/shouldjs/equal/issues"
},
"homepage": "https://github.com/shouldjs/equal",
"devDependencies": {
"eslint": "^3.0.0",
"eslint-config-shouldjs": "^1.0.2",
"mocha": "^3.5.0",
"mocha-better-spec-reporter": "^3.1.0",
"rollup": "0.34.7"
},
"dependencies": {
"should-type": "^1.4.0"
},
"files": ["cjs/*", "es6/*", "README.md", "LICENSE"]
}