Jasmine Pretty Printer when comparing objects

gistfile1.js

jasmine.MAX_PRETTY_PRINT_DEPTH = 3;

jasmine.pp = (function (j$) {
  function PrettyPrinter() {
    this.ppNestLevel_ = 0;
    this.seen = [];
  }

  PrettyPrinter.prototype.format = function(value) {
    this.ppNestLevel_++;
    try {
      if (j$.util.isUndefined(value)) {
        this.emitScalar('undefined');
      } else if (value === null) {
        this.emitScalar('null');
      } else if (value === 0 && 1/value === -Infinity) {
        this.emitScalar('-0');
      } else if (value === j$.getGlobal()) {
        this.emitScalar('<global>');
      } else if (value.jasmineToString) {
        this.emitScalar(value.jasmineToString());
      } else if (typeof value === 'string') {
        this.emitString(value);
      } else if (j$.isSpy(value)) {
        this.emitScalar('spy on ' + value.and.identity());
      } else if (value instanceof RegExp) {
        this.emitScalar(value.toString());
      } else if (typeof value === 'function') {
        this.emitScalar('Function');
      } else if (typeof value.nodeType === 'number') {
        this.emitScalar('HTMLNode');
      } else if (value instanceof Date) {
        this.emitScalar('Date(' + value + ')');
      } else if (j$.util.arrayContains(this.seen, value)) {
        this.emitScalar('<circular reference: ' + (j$.isArray_(value) ? 'Array' : 'Object') + '>');
      } else if (j$.isArray_(value) || j$.isA_('Object', value)) {
        this.seen.push(value);
        if (j$.isArray_(value)) {
          this.emitArray(value);
        } else {
          this.emitObject(value);
        }
        this.seen.pop();
      } else {
        this.emitScalar(value.toString());
      }
    } finally {
      this.ppNestLevel_--;
    }
  };

  PrettyPrinter.prototype.iterateObject = function(obj, fn) {
    for (var property in obj) {
      if (!Object.prototype.hasOwnProperty.call(obj, property)) { continue; }
      fn(property, obj.__lookupGetter__ ? (!j$.util.isUndefined(obj.__lookupGetter__(property)) &&
          obj.__lookupGetter__(property) !== null) : false);
    }
  };

  PrettyPrinter.prototype.emitArray = j$.unimplementedMethod_;
  PrettyPrinter.prototype.emitObject = j$.unimplementedMethod_;
  PrettyPrinter.prototype.emitScalar = j$.unimplementedMethod_;
  PrettyPrinter.prototype.emitString = j$.unimplementedMethod_;

  function StringPrettyPrinter() {
    PrettyPrinter.call(this);

    this.string = '';
  }

  j$.util.inherit(StringPrettyPrinter, PrettyPrinter);

  StringPrettyPrinter.prototype.emitScalar = function(value) {
    this.append(value);
  };

  StringPrettyPrinter.prototype.emitString = function(value) {
    this.append('\'' + value + '\'');
  };

  StringPrettyPrinter.prototype.emitArray = function(array) {
    if (this.ppNestLevel_ > j$.MAX_PRETTY_PRINT_DEPTH) {
      this.append('Array');
      return;
    }
    var length = Math.min(array.length, j$.MAX_PRETTY_PRINT_ARRAY_LENGTH);
    this.append('[ ');
    for (var i = 0; i < length; i++) {
      if (i > 0) {
        this.append(', ');
      }
      this.format(array[i]);
    }
    if(array.length > length){
      this.append(', ...');
    }

    var self = this;
    var first = array.length === 0;
    this.iterateObject(array, function(property, isGetter) {
      if (property.match(/^\d+$/)) {
        return;
      }

      if (first) {
        first = false;
      } else {
        self.append(', ');
      }

      self.formatProperty(array, property, isGetter);
    });

    this.append(' ]');
  };

  StringPrettyPrinter.prototype.emitObject = function(obj) {
    var constructorName, padding, self, first, i, max;

    constructorName = obj.constructor ? j$.fnNameFor(obj.constructor) : 'null';
    this.append(constructorName);

    if (this.ppNestLevel_ > j$.MAX_PRETTY_PRINT_DEPTH) {
      this.append('...');
      return;
    }

    padding = '';
    for(var i = 0, max = this.ppNestLevel_; i < max; i++){
      padding += '\t';
    }

    self = this;
    this.append('({');
    first = true;

    this.iterateObject(obj, function(property, isGetter) {
      if (first) {
        first = false;
      } else {
        self.append(',');
      }
      self.append('\n');
      self.formatProperty(obj, property, isGetter, padding);
    });

    if (first) {
      this.append(' ');
    } else {
      this.append('\n' + padding.substring(1));
    }
    this.append('})');
  };

  StringPrettyPrinter.prototype.formatProperty = function(obj, property, isGetter, padding) {
      this.append(padding + property + ': ');
      if (isGetter) {
        this.append('<getter>');
      } else {
        this.format(obj[property]);
      }
  };

  StringPrettyPrinter.prototype.append = function(value) {
    this.string += value;
  };

  return function(value) {
    var stringPrettyPrinter = new StringPrettyPrinter();
    stringPrettyPrinter.format(value);
    return stringPrettyPrinter.string;
  };

})(jasmine);