tape-watcher/dependencies/object-inspect-fork.js

Runs tape tests when files change and prints a pretty output

var hasMap = typeof Map === 'function' && Map.prototype;
var mapSizeDescriptor = Object.getOwnPropertyDescriptor && hasMap ? Object.getOwnPropertyDescriptor(Map.prototype, 'size') : null;
var mapSize = hasMap && mapSizeDescriptor && typeof mapSizeDescriptor.get === 'function' ? mapSizeDescriptor.get : null;
var mapForEach = hasMap && Map.prototype.forEach;
var hasSet = typeof Set === 'function' && Set.prototype;
var setSizeDescriptor = Object.getOwnPropertyDescriptor && hasSet ? Object.getOwnPropertyDescriptor(Set.prototype, 'size') : null;
var setSize = hasSet && setSizeDescriptor && typeof setSizeDescriptor.get === 'function' ? setSizeDescriptor.get : null;
var setForEach = hasSet && Set.prototype.forEach;
var booleanValueOf = Boolean.prototype.valueOf;
var objectToString = Object.prototype.toString;

module.exports = function inspect_ (obj, opts, depth, seen) {
    if (typeof obj === 'undefined') {
        return 'undefined';
    }
    if (obj === null) {
        return 'null';
    }
    if (typeof obj === 'boolean') {
        return obj ? 'true' : 'false';
    }
    if (typeof obj === 'string') {
        return inspectString(obj);
    }
    if (typeof obj === 'number') {
      if (obj === 0) {
        return Infinity / obj > 0 ? '0' : '-0';
      }
      return String(obj);
    }

    if (!opts) opts = {};

    var maxDepth = typeof opts.depth === 'undefined' ? 5 : opts.depth;
    if (typeof depth === 'undefined') depth = 0;
    if (depth >= maxDepth && maxDepth > 0 && typeof obj === 'object') {
        return '[Object]';
    }
    
    var indent = getIndent(opts, depth);
    
    if (typeof seen === 'undefined') seen = [];
    else if (indexOf(seen, obj) >= 0) {
        return '[Circular]';
    }
    
    function inspect (value, from, noIndent) {
        if (from) {
            seen = seen.slice();
            seen.push(from);
        }
        if (noIndent) {
            return inspect_(value, null, depth + 1, seen);
        }
        return inspect_(value, opts, depth + 1, seen);
    }

    if (typeof obj === 'function') {
        var name = nameOf(obj);
        return '[Function' + (name ? ': ' + name : '') + ']';
    }
    if (isSymbol(obj)) {
        var symString = Symbol.prototype.toString.call(obj);
        return typeof obj === 'object' ? markBoxed(symString) : symString;
    }
    if (isElement(obj)) {
        var s = '<' + String(obj.nodeName).toLowerCase();
        var attrs = obj.attributes || [];
        for (var i = 0; i < attrs.length; i++) {
            s += ' ' + attrs[i].name + '="' + quote(attrs[i].value) + '"';
        }
        s += '>';
        if (obj.childNodes && obj.childNodes.length) s += '...';
        s += '</' + String(obj.nodeName).toLowerCase() + '>';
        return s;
    }
    if (isArray(obj)) {
        if (obj.length === 0) return '[]';
        var xs = Array(obj.length);
        for (var i = 0; i < obj.length; i++) {
            xs[i] = has(obj, i) ? inspect(obj[i], obj) : '';
        }
        if (indent && !singleLineValues(xs)) {
            return '[' + indentedJoin(xs, indent) + ']';
        } else {
            return '[ ' + xs.join(', ') + ' ]';
        }
    }
    if (isError(obj)) {
        var parts = [];
        for (var key in obj) {
            if (!has(obj, key)) continue;
            
            if (/[^\w$]/.test(key)) {
                parts.push(inspect(key) + ': ' + inspect(obj[key]));
            }
            else {
                parts.push(key + ': ' + inspect(obj[key]));
            }
        }
        if (parts.length === 0) return '[' + String(obj) + ']';
        return '{ [' + String(obj) + '] ' + parts.join(', ') + ' }';
    }
    if (typeof obj === 'object' && typeof obj.inspect === 'function') {
        return obj.inspect();
    }
    if (isMap(obj)) {
        var parts = [];
        mapForEach.call(obj, function (value, key) {
            parts.push(inspect(key, obj, true) + ' => ' + inspect(value, obj));
        });
        return collectionOf('Map', mapSize.call(obj), parts, indent);
    }
    if (isSet(obj)) {
        var parts = [];
        setForEach.call(obj, function (value ) {
            parts.push(inspect(value, obj));
        });
        return collectionOf('Set', setSize.call(obj), parts, indent);
    }
    if (isNumber(obj)) {
        return markBoxed(Number(obj));
    }
    if (isBoolean(obj)) {
        return markBoxed(booleanValueOf.call(obj));
    }
    if (isString(obj)) {
        return markBoxed(inspect(String(obj)));
    }
    if (!isDate(obj) && !isRegExp(obj)) {
        var xs = [];
        var keys = objectKeys(obj);
        keys.sort();
        for (var i = 0; i < keys.length; i++) {
            var key = keys[i];
            if (/[^\w$]/.test(key)) {
                xs.push(inspect(key) + ': ' + inspect(obj[key], obj));
            }
            else xs.push(key + ': ' + inspect(obj[key], obj));
        }
        if (xs.length === 0) return '{}';

        if (indent) {
            return '{' + indentedJoin(xs, indent) + '}';
        } else {
            return '{ ' + xs.join(', ') + ' }';
        }
    }
    return String(obj);
};

function objectKeys(obj) {
    var keys = [];
    for (var key in obj) {
        if (has(obj, key)) keys.push(key);
    }
    return keys;
}

function quote (s) {
    return String(s).replace(/"/g, '&quot;');
}

function isArray (obj) { return toStr(obj) === '[object Array]' }
function isDate (obj) { return toStr(obj) === '[object Date]' }
function isRegExp (obj) { return toStr(obj) === '[object RegExp]' }
function isError (obj) { return toStr(obj) === '[object Error]' }
function isSymbol (obj) { return toStr(obj) === '[object Symbol]' }
function isString (obj) { return toStr(obj) === '[object String]' }
function isNumber (obj) { return toStr(obj) === '[object Number]' }
function isBoolean (obj) { return toStr(obj) === '[object Boolean]' }

var hasOwn = Object.prototype.hasOwnProperty || function (key) { return key in this; };
function has (obj, key) {
    return hasOwn.call(obj, key);
}

function toStr (obj) {
    return objectToString.call(obj);
}

function nameOf (f) {
    if (f.name) return f.name;
    var m = String(f).match(/^function\s*([\w$]+)/);
    if (m) return m[1];
}

function indexOf (xs, x) {
    if (xs.indexOf) return xs.indexOf(x);
    for (var i = 0, l = xs.length; i < l; i++) {
        if (xs[i] === x) return i;
    }
    return -1;
}

function isMap (x) {
    if (!mapSize) {
        return false;
    }
    try {
        mapSize.call(x);
        return true;
    } catch (e) {}
    return false;
}

function isSet (x) {
    if (!setSize) {
        return false;
    }
    try {
        setSize.call(x);
        return true;
    } catch (e) {}
    return false;
}

function isElement (x) {
    if (!x || typeof x !== 'object') return false;
    if (typeof HTMLElement !== 'undefined' && x instanceof HTMLElement) {
        return true;
    }
    return typeof x.nodeName === 'string'
        && typeof x.getAttribute === 'function'
    ;
}

function inspectString (str) {
    var s = str.replace(/(['\\])/g, '\\$1').replace(/[\x00-\x1f]/g, lowbyte);
    return "'" + s + "'"; 
}

function lowbyte (c) {
    var n = c.charCodeAt(0);
    var x = { 8: 'b', 9: 't', 10: 'n', 12: 'f', 13: 'r' }[n];
    if (x) return '\\' + x;
    return '\\x' + (n < 0x10 ? '0' : '') + n.toString(16);
}

function markBoxed (str) {
    return 'Object(' + str + ')';
}

function collectionOf(type, size, entries, indent) {
    var joinedEntries = indent ? indentedJoin(entries, indent) : entries.join(', ');
    return type + ' (' + size + ') {' + joinedEntries + '}';
}

function singleLineValues(xs) {
    for (var i = 0; i < xs.length; i++) {
        if (xs[i].indexOf('\n') >= 0) {
            return false;
        }
    }
    return true;
}

function getIndent(opts, depth) {
    var baseIndent;
    if (opts.indent === '\t') {
        baseIndent = '\t';
    } else if (typeof opts.indent === 'number' && opts.indent > 0) {
        baseIndent = Array(opts.indent + 1).join(' ');
    } else {
        return null;
    }
    return {
        base: baseIndent,
        prev: Array(depth + 1).join(baseIndent)
    };
}

function indentedJoin(xs, indent) {
    if (xs.length === 0) return '';
    var lineJoiner = '\n' + indent.prev + indent.base;
    return lineJoiner + xs.join(',' + lineJoiner) + '\n' + indent.prev;
}