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7d14dd9b5e
This commit modifies util.inspect(obj) to additionally show the name of
the function that constructed the object. This often reveals useful
information about the object's prototype. In other words, instead of
> new Cls
{}
we have
> new Cls
Cls {}
This also works with exotic objects:
> class ArrayCls extends Array {}
> new ArrayCls(1, 2, 3)
ArrayCls [ 1, 2, 3 ]
The names of "trivial" constructors like Object and Array are not shown,
unless there is a mismatch between the object representation and the
prototype:
> Object.create([])
Array {}
This feature is inspired by browser devtools.
PR-URL: https://github.com/nodejs/io.js/pull/1935
Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
110 lines
3.8 KiB
JavaScript
110 lines
3.8 KiB
JavaScript
'use strict';
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var common = require('../common');
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var assert = require('assert');
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assert.equal('0', common.inspect(0));
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assert.equal('1', common.inspect(1));
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assert.equal('false', common.inspect(false));
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assert.equal("''", common.inspect(''));
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assert.equal("'hello'", common.inspect('hello'));
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assert.equal('[Function]', common.inspect(function() {}));
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assert.equal('undefined', common.inspect(undefined));
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assert.equal('null', common.inspect(null));
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assert.equal('/foo(bar\\n)?/gi', common.inspect(/foo(bar\n)?/gi));
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assert.equal(new Date('2010-02-14T12:48:40+01:00').toString(),
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common.inspect(new Date('Sun, 14 Feb 2010 11:48:40 GMT')));
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assert.equal("'\\n\\u0001'", common.inspect('\n\u0001'));
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assert.equal('[]', common.inspect([]));
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assert.equal('Array {}', common.inspect(Object.create([])));
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assert.equal('[ 1, 2 ]', common.inspect([1, 2]));
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assert.equal('[ 1, [ 2, 3 ] ]', common.inspect([1, [2, 3]]));
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assert.equal('{}', common.inspect({}));
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assert.equal('{ a: 1 }', common.inspect({a: 1}));
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assert.equal('{ a: [Function] }', common.inspect({a: function() {}}));
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assert.equal('{ a: 1, b: 2 }', common.inspect({a: 1, b: 2}));
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assert.equal('{ a: {} }', common.inspect({'a': {}}));
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assert.equal('{ a: { b: 2 } }', common.inspect({'a': {'b': 2}}));
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assert.equal('{ a: { b: { c: [Object] } } }',
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common.inspect({'a': {'b': { 'c': { 'd': 2 }}}}));
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assert.equal('{ a: { b: { c: { d: 2 } } } }',
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common.inspect({'a': {'b': { 'c': { 'd': 2 }}}}, false, null));
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assert.equal('[ 1, 2, 3, [length]: 3 ]', common.inspect([1, 2, 3], true));
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assert.equal('{ a: [Object] }',
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common.inspect({'a': {'b': { 'c': 2}}}, false, 0));
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assert.equal('{ a: { b: [Object] } }',
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common.inspect({'a': {'b': { 'c': 2}}}, false, 1));
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assert.equal('{ visible: 1 }',
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common.inspect(Object.create({},
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{visible: {value: 1, enumerable: true}, hidden: {value: 2}}))
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);
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// Due to the hash seed randomization it's not deterministic the order that
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// the following ways this hash is displayed.
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// See http://codereview.chromium.org/9124004/
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var out = common.inspect(Object.create({},
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{visible: {value: 1, enumerable: true}, hidden: {value: 2}}), true);
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if (out !== '{ [hidden]: 2, visible: 1 }' &&
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out !== '{ visible: 1, [hidden]: 2 }') {
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assert.ok(false);
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}
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// Objects without prototype
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var out = common.inspect(Object.create(null,
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{ name: {value: 'Tim', enumerable: true},
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hidden: {value: 'secret'}}), true);
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if (out !== "{ [hidden]: 'secret', name: 'Tim' }" &&
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out !== "{ name: 'Tim', [hidden]: 'secret' }") {
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assert(false);
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}
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assert.equal('{ name: \'Tim\' }',
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common.inspect(Object.create(null,
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{name: {value: 'Tim', enumerable: true},
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hidden: {value: 'secret'}}))
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);
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// Dynamic properties
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assert.equal('{ readonly: [Getter] }',
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common.inspect({get readonly() {}}));
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assert.equal('{ readwrite: [Getter/Setter] }',
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common.inspect({get readwrite() {}, set readwrite(val) {}}));
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assert.equal('{ writeonly: [Setter] }',
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common.inspect({set writeonly(val) {}}));
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var value = {};
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value['a'] = value;
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assert.equal('{ a: [Circular] }', common.inspect(value));
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// Array with dynamic properties
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value = [1, 2, 3];
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value.__defineGetter__('growingLength', function() {
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this.push(true); return this.length;
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});
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assert.equal('[ 1, 2, 3, growingLength: [Getter] ]', common.inspect(value));
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// Function with properties
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value = function() {};
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value.aprop = 42;
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assert.equal('{ [Function] aprop: 42 }', common.inspect(value));
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// Regular expressions with properties
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value = /123/ig;
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value.aprop = 42;
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assert.equal('{ /123/gi aprop: 42 }', common.inspect(value));
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// Dates with properties
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value = new Date('Sun, 14 Feb 2010 11:48:40 GMT');
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value.aprop = 42;
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assert.equal('{ Sun, 14 Feb 2010 11:48:40 GMT aprop: 42 }',
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common.inspect(value)
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);
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