jasmine/src/core/PrettyPrinter.js

getJasmineRequireObj().pp = function(j$) {

  function PrettyPrinter() {
    this.ppNestLevel_ = 0;
    this.seen = [];
  }

  function hasCustomToString(value) {
    // value.toString !== Object.prototype.toString if value has no custom toString but is from another context (e.g.
    // iframe, web worker)
    return value.toString !== Object.prototype.toString && (value.toString() !== Object.prototype.toString.call(value));
  }

  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$.isSpy(value)) {
        this.emitScalar('spy on ' + value.and.identity());
      } else if (value instanceof RegExp) {
        this.emitScalar(value.toString());
      } else if (typeof value === 'function') {
        this.emitScalar('Function');
      } else if (typeof value.nodeType === 'number') {
        this.emitScalar('HTMLNode');
      } else if (value instanceof Date) {
        this.emitScalar('Date(' + value + ')');
      } else if (value.toString && value.toString() == '[object Set]') {
        this.emitSet(value);
      } else if (value.toString && typeof value === 'object' && !j$.isArray_(value) && hasCustomToString(value)) {
        this.emitScalar(value.toString());
      } 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$.unimplementedMethod_;
  PrettyPrinter.prototype.emitSet = j$.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.emitSet = function(set) {
    if (this.ppNestLevel_ > j$.MAX_PRETTY_PRINT_DEPTH) {
      this.append('Set');
      return;
    }
    this.append('Set( ');
    var size = Math.min(set.size, j$.MAX_PRETTY_PRINT_ARRAY_LENGTH);
    var iter = set.values();
    for (var i = 0; i < size; i++) {
      if (i > 0) {
        this.append(', ');
      }
      this.format(iter.next().value);
    }
    if (set.size > size){
      this.append(', ...');
    }
    this.append(' )');
  };

  StringPrettyPrinter.prototype.emitObject = function(obj) {
    var ctor = obj.constructor,
        constructorName;

    constructorName = typeof ctor === 'function' && obj instanceof ctor ?
      j$.fnNameFor(obj.constructor) :
      'null';

    this.append(constructorName);

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

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

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

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

    this.append(' })');
  };

  StringPrettyPrinter.prototype.formatProperty = function(obj, property, isGetter) {
      this.append(property);
      this.append(': ');
      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;
  };
};