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Current File : /home/opti/workflow/node_modules/chai/lib/chai/utils/inspect.js |
// This is (almost) directly from Node.js utils // https://github.com/joyent/node/blob/f8c335d0caf47f16d31413f89aa28eda3878e3aa/lib/util.js var getName = require('get-func-name'); var getProperties = require('./getProperties'); var getEnumerableProperties = require('./getEnumerableProperties'); var config = require('../config'); module.exports = inspect; /** * ### .inspect(obj, [showHidden], [depth], [colors]) * * Echoes the value of a value. Tries to print the value out * in the best way possible given the different types. * * @param {Object} obj The object to print out. * @param {Boolean} showHidden Flag that shows hidden (not enumerable) * properties of objects. Default is false. * @param {Number} depth Depth in which to descend in object. Default is 2. * @param {Boolean} colors Flag to turn on ANSI escape codes to color the * output. Default is false (no coloring). * @namespace Utils * @name inspect */ function inspect(obj, showHidden, depth, colors) { var ctx = { showHidden: showHidden, seen: [], stylize: function (str) { return str; } }; return formatValue(ctx, obj, (typeof depth === 'undefined' ? 2 : depth)); } // 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' && 'nodeType' in object && object.nodeType === 1 && typeof object.nodeName === 'string'; } }; function formatValue(ctx, 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.inspect !== exports.inspect && // Also filter out any prototype objects using the circular check. !(value.constructor && value.constructor.prototype === value)) { var ret = value.inspect(recurseTimes, ctx); if (typeof ret !== 'string') { ret = formatValue(ctx, ret, recurseTimes); } return ret; } // Primitive types cannot have properties var primitive = formatPrimitive(ctx, value); if (primitive) { return primitive; } // If this is a DOM element, try to get the outer HTML. if (isDOMElement(value)) { if ('outerHTML' in value) { return value.outerHTML; // This value does not have an outerHTML attribute, // it could still be an XML element } else { // Attempt to serialize it try { if (document.xmlVersion) { var xmlSerializer = new XMLSerializer(); return xmlSerializer.serializeToString(value); } else { // Firefox 11- do not support outerHTML // It does, however, support innerHTML // Use the following to render the element var ns = "http://www.w3.org/1999/xhtml"; var container = document.createElementNS(ns, '_'); container.appendChild(value.cloneNode(false)); var html = container.innerHTML .replace('><', '>' + value.innerHTML + '<'); container.innerHTML = ''; return html; } } catch (err) { // This could be a non-native DOM implementation, // continue with the normal flow: // printing the element as if it is an object. } } } // Look up the keys of the object. var visibleKeys = getEnumerableProperties(value); var keys = ctx.showHidden ? getProperties(value) : visibleKeys; var name, nameSuffix; // Some type of object without properties can be shortcut. // In IE, errors have a single `stack` property, or if they are vanilla `Error`, // a `stack` plus `description` property; ignore those for consistency. if (keys.length === 0 || (isError(value) && ( (keys.length === 1 && keys[0] === 'stack') || (keys.length === 2 && keys[0] === 'description' && keys[1] === 'stack') ))) { if (typeof value === 'function') { name = getName(value); nameSuffix = name ? ': ' + name : ''; return ctx.stylize('[Function' + nameSuffix + ']', 'special'); } if (isRegExp(value)) { return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp'); } if (isDate(value)) { return ctx.stylize(Date.prototype.toUTCString.call(value), 'date'); } if (isError(value)) { return formatError(value); } } var base = '' , array = false , typedArray = false , braces = ['{', '}']; if (isTypedArray(value)) { typedArray = true; braces = ['[', ']']; } // Make Array say that they are Array if (isArray(value)) { array = true; braces = ['[', ']']; } // Make functions say that they are functions if (typeof value === 'function') { name = getName(value); nameSuffix = name ? ': ' + name : ''; base = ' [Function' + nameSuffix + ']'; } // Make RegExps say that they are RegExps if (isRegExp(value)) { base = ' ' + RegExp.prototype.toString.call(value); } // Make dates with properties first say the date if (isDate(value)) { base = ' ' + Date.prototype.toUTCString.call(value); } // Make error with message first say the error if (isError(value)) { return formatError(value); } if (keys.length === 0 && (!array || value.length == 0)) { return braces[0] + base + braces[1]; } if (recurseTimes < 0) { if (isRegExp(value)) { return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp'); } else { return ctx.stylize('[Object]', 'special'); } } ctx.seen.push(value); var output; if (array) { output = formatArray(ctx, value, recurseTimes, visibleKeys, keys); } else if (typedArray) { return formatTypedArray(value); } else { output = keys.map(function(key) { return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array); }); } ctx.seen.pop(); return reduceToSingleString(output, base, braces); } function formatPrimitive(ctx, value) { switch (typeof value) { case 'undefined': return ctx.stylize('undefined', 'undefined'); case 'string': var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '') .replace(/'/g, "\\'") .replace(/\\"/g, '"') + '\''; return ctx.stylize(simple, 'string'); case 'number': if (value === 0 && (1/value) === -Infinity) { return ctx.stylize('-0', 'number'); } return ctx.stylize('' + value, 'number'); case 'boolean': return ctx.stylize('' + value, 'boolean'); case 'symbol': return ctx.stylize(value.toString(), 'symbol'); } // For some reason typeof null is "object", so special case here. if (value === null) { return ctx.stylize('null', 'null'); } } function formatError(value) { return '[' + Error.prototype.toString.call(value) + ']'; } function formatArray(ctx, value, recurseTimes, visibleKeys, keys) { var output = []; for (var i = 0, l = value.length; i < l; ++i) { if (Object.prototype.hasOwnProperty.call(value, String(i))) { output.push(formatProperty(ctx, value, recurseTimes, visibleKeys, String(i), true)); } else { output.push(''); } } keys.forEach(function(key) { if (!key.match(/^\d+$/)) { output.push(formatProperty(ctx, value, recurseTimes, visibleKeys, key, true)); } }); return output; } function formatTypedArray(value) { var str = '[ '; for (var i = 0; i < value.length; ++i) { if (str.length >= config.truncateThreshold - 7) { str += '...'; break; } str += value[i] + ', '; } str += ' ]'; // Removing trailing `, ` if the array was not truncated if (str.indexOf(', ]') !== -1) { str = str.replace(', ]', ' ]'); } return str; } function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) { var name; var propDescriptor = Object.getOwnPropertyDescriptor(value, key); var str; if (propDescriptor) { if (propDescriptor.get) { if (propDescriptor.set) { str = ctx.stylize('[Getter/Setter]', 'special'); } else { str = ctx.stylize('[Getter]', 'special'); } } else { if (propDescriptor.set) { str = ctx.stylize('[Setter]', 'special'); } } } if (visibleKeys.indexOf(key) < 0) { name = '[' + key + ']'; } if (!str) { if (ctx.seen.indexOf(value[key]) < 0) { if (recurseTimes === null) { str = formatValue(ctx, value[key], null); } else { str = formatValue(ctx, value[key], recurseTimes - 1); } if (str.indexOf('\n') > -1) { if (array) { str = str.split('\n').map(function(line) { return ' ' + line; }).join('\n').substr(2); } else { str = '\n' + str.split('\n').map(function(line) { return ' ' + line; }).join('\n'); } } } else { str = ctx.stylize('[Circular]', 'special'); } } if (typeof name === 'undefined') { if (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 = ctx.stylize(name, 'name'); } else { name = name.replace(/'/g, "\\'") .replace(/\\"/g, '"') .replace(/(^"|"$)/g, "'"); name = ctx.stylize(name, 'string'); } } return name + ': ' + str; } function reduceToSingleString(output, base, braces) { var length = output.reduce(function(prev, cur) { return prev + cur.length + 1; }, 0); if (length > 60) { return braces[0] + (base === '' ? '' : base + '\n ') + ' ' + output.join(',\n ') + ' ' + braces[1]; } return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1]; } function isTypedArray(ar) { // Unfortunately there's no way to check if an object is a TypedArray // We have to check if it's one of these types return (typeof ar === 'object' && /\w+Array]$/.test(objectToString(ar))); } function isArray(ar) { return Array.isArray(ar) || (typeof ar === 'object' && objectToString(ar) === '[object Array]'); } function isRegExp(re) { return typeof re === 'object' && objectToString(re) === '[object RegExp]'; } function isDate(d) { return typeof d === 'object' && objectToString(d) === '[object Date]'; } function isError(e) { return typeof e === 'object' && objectToString(e) === '[object Error]'; } function objectToString(o) { return Object.prototype.toString.call(o); }