Module: Kernel

Defined in:
opal/opal/corelib/kernel.rb

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(symbol, *args, &block) ⇒ Object

Raises:

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# File 'opal/opal/corelib/kernel.rb', line 2

def method_missing(symbol, *args, &block)
  raise NoMethodError, "undefined method `#{symbol}' for #{inspect}"
end

Instance Method Details

#<=>(other) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 14

def <=>(other)
  %x{
    if (#{self == other}) {
      return 0;
    }

    return nil;
  }
end

#===(other) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 10

def ===(other)
  self == other
end

#=~(obj) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 6

def =~(obj)
  false
end

#Array(object, *args, &block) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 57

def Array(object, *args, &block)
  %x{
    if (object == null || object === nil) {
      return [];
    }
    else if (#{object.respond_to? :to_ary}) {
      return #{object.to_ary};
    }
    else if (#{object.respond_to? :to_a}) {
      return #{object.to_a};
    }
    else {
      return [object];
    }
  }
end

#caller ⇒ Object

Opal does not support #caller, but we stub it as an empty array to not break dependant libs

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# File 'opal/opal/corelib/kernel.rb', line 76

def caller
  []
end

#class ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 80

def class
  `self._klass`
end

#clone ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 96

def clone
  copy = self.class.allocate

  copy.copy_instance_variables(self)
  copy.initialize_clone(self)

  copy
end

#copy_instance_variables(other) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 84

def copy_instance_variables(other)
  %x{
    for (var name in other) {
      if (name.charAt(0) !== '$') {
        if (name !== '_id' && name !== '_klass') {
          self[name] = other[name];
        }
      }
    }
  }
end

#define_singleton_method(name, &body) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 109

def define_singleton_method(name, &body)
  unless body
    raise ArgumentError, "tried to create Proc object without a block"
  end

  %x{
    var jsid   = '$' + name;
    body._jsid = name;
    body._s    = null;
    body._def  = body;

    #{singleton_class}._proto[jsid] = body;

    return self;
  }
end

#dup ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 126

def dup
  copy = self.class.allocate

  copy.copy_instance_variables(self)
  copy.initialize_dup(self)

  copy
end

#enum_for(method = :each, *args, &block) ⇒ Object Also known as: to_enum

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# File 'opal/opal/corelib/kernel.rb', line 139

def enum_for(method = :each, *args, &block)
  Enumerator.for(self, method, *args, &block)
end

#equal?(other) ⇒ Boolean

Returns:

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# File 'opal/opal/corelib/kernel.rb', line 145

def equal?(other)
  `self === other`
end

#extend(*mods) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 149

def extend(*mods)
  %x{
    var singleton = #{singleton_class};

    for (var i = mods.length - 1; i >= 0; i--) {
      var mod = mods[i];

      #{`mod`.append_features `singleton`};
      #{`mod`.extended self};
    }
  }

  self
end

#Float(value) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 378

def Float(value)
  if String === value
    `parseFloat(value)`
  elsif value.respond_to? :to_f
    value.to_f
  else
    raise TypeError, "can't convert #{value.class} into Float"
  end
end

#format(format, *args) ⇒ Object Also known as: sprintf

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# File 'opal/opal/corelib/kernel.rb', line 164

def format(format, *args)
  %x{
    var idx = 0;
    return format.replace(/%(\d+\$)?([-+ 0]*)(\d*|\*(\d+\$)?)(?:\.(\d*|\*(\d+\$)?))?([cspdiubBoxXfgeEG])|(%%)/g, function(str, idx_str, flags, width_str, w_idx_str, prec_str, p_idx_str, spec, escaped) {
      if (escaped) {
        return '%';
      }

      var width,
      prec,
      is_integer_spec = ("diubBoxX".indexOf(spec) != -1),
      is_float_spec = ("eEfgG".indexOf(spec) != -1),
      prefix = '',
      obj;

      if (width_str === undefined) {
        width = undefined;
      } else if (width_str.charAt(0) == '*') {
        var w_idx = idx++;
        if (w_idx_str) {
          w_idx = parseInt(w_idx_str, 10) - 1;
        }
        width = #{`args[w_idx]`.to_i};
      } else {
        width = parseInt(width_str, 10);
      }
      if (!prec_str) {
        prec = is_float_spec ? 6 : undefined;
      } else if (prec_str.charAt(0) == '*') {
        var p_idx = idx++;
        if (p_idx_str) {
          p_idx = parseInt(p_idx_str, 10) - 1;
        }
        prec = #{`args[p_idx]`.to_i};
      } else {
        prec = parseInt(prec_str, 10);
      }
      if (idx_str) {
        idx = parseInt(idx_str, 10) - 1;
      }
      switch (spec) {
      case 'c':
        obj = args[idx];
        if (obj._isString) {
          str = obj.charAt(0);
        } else {
          str = String.fromCharCode(#{`obj`.to_i});
        }
        break;
      case 's':
        str = #{`args[idx]`.to_s};
        if (prec !== undefined) {
          str = str.substr(0, prec);
        }
        break;
      case 'p':
        str = #{`args[idx]`.inspect};
        if (prec !== undefined) {
          str = str.substr(0, prec);
        }
        break;
      case 'd':
      case 'i':
      case 'u':
        str = #{`args[idx]`.to_i}.toString();
        break;
      case 'b':
      case 'B':
        str = #{`args[idx]`.to_i}.toString(2);
        break;
      case 'o':
        str = #{`args[idx]`.to_i}.toString(8);
        break;
      case 'x':
      case 'X':
        str = #{`args[idx]`.to_i}.toString(16);
        break;
      case 'e':
      case 'E':
        str = #{`args[idx]`.to_f}.toExponential(prec);
        break;
      case 'f':
        str = #{`args[idx]`.to_f}.toFixed(prec);
        break;
      case 'g':
      case 'G':
        str = #{`args[idx]`.to_f}.toPrecision(prec);
        break;
      }
      idx++;
      if (is_integer_spec || is_float_spec) {
        if (str.charAt(0) == '-') {
          prefix = '-';
          str = str.substr(1);
        } else {
          if (flags.indexOf('+') != -1) {
            prefix = '+';
          } else if (flags.indexOf(' ') != -1) {
            prefix = ' ';
          }
        }
      }
      if (is_integer_spec && prec !== undefined) {
        if (str.length < prec) {
          str = #{'0' * `prec - str.length`} + str;
        }
      }
      var total_len = prefix.length + str.length;
      if (width !== undefined && total_len < width) {
        if (flags.indexOf('-') != -1) {
          str = str + #{' ' * `width - total_len`};
        } else {
          var pad_char = ' ';
          if (flags.indexOf('0') != -1) {
            str = #{'0' * `width - total_len`} + str;
          } else {
            prefix = #{' ' * `width - total_len`} + prefix;
          }
        }
      }
      var result = prefix + str;
      if ('XEG'.indexOf(spec) != -1) {
        result = result.toUpperCase();
      }
      return result;
    });
  }
end

#freeze ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 581

def freeze
  @___frozen___ = true
  self
end

#frozen? ⇒ Boolean

Returns:

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# File 'opal/opal/corelib/kernel.rb', line 586

def frozen?
  @___frozen___ || false
end

#hash ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 293

def hash
  `self._id`
end

#initialize_clone(other) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 105

def initialize_clone(other)
  initialize_copy(other)
end

#initialize_copy(other) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 297

def initialize_copy(other)
end

#initialize_dup(other) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 135

def initialize_dup(other)
  initialize_copy(other)
end

#inspect ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 300

def inspect
  to_s
end

#instance_of?(klass) ⇒ Boolean

Returns:

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# File 'opal/opal/corelib/kernel.rb', line 304

def instance_of?(klass)
  `self._klass === klass`
end

#instance_variable_defined?(name) ⇒ Boolean

Returns:

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# File 'opal/opal/corelib/kernel.rb', line 308

def instance_variable_defined?(name)
  `$opal.hasOwnProperty.call(self, name.substr(1))`
end

#instance_variable_get(name) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 312

def instance_variable_get(name)
  %x{
    var ivar = self[name.substr(1)];

    return ivar == null ? nil : ivar;
  }
end

#instance_variable_set(name, value) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 320

def instance_variable_set(name, value)
  `self[name.substr(1)] = value`
end

#instance_variables ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 324

def instance_variables
  %x{
    var result = [];

    for (var name in self) {
      if (name.charAt(0) !== '$') {
        if (name !== '_klass' && name !== '_id') {
          result.push('@' + name);
        }
      }
    }

    return result;
  }
end

#Integer(value, base = nil) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 340

def Integer(value, base = nil)
  if String === value
    if value.empty?
      raise ArgumentError, "invalid value for Integer: (empty string)"
    end

    return `parseInt(#{value}, #{base || `undefined`})`
  end

  if base
    raise ArgumentError "base is only valid for String values"
  end

  case value
  when Integer
    value

  when Float
    if value.nan? or value.infinite?
      raise FloatDomainError, "unable to coerce #{value} to Integer"
    end

    value.to_int

  when NilClass
    raise TypeError, "can't convert nil into Integer"

  else
    if value.respond_to? :to_int
      value.to_int
    elsif value.respond_to? :to_i
      value.to_i
    else
      raise TypeError, "can't convert #{value.class} into Integer"
    end
  end
end

#is_a?(klass) ⇒ Boolean Also known as: kind_of?

Returns:

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# File 'opal/opal/corelib/kernel.rb', line 388

def is_a?(klass)
  `$opal.is_a(self, klass)`
end

#lambda(&block) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 394

def lambda(&block)
  `block.is_lambda = true`

  block
end

#loop(&block) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 400

def loop(&block)
  %x{
    while (true) {
      if (block() === $breaker) {
        return $breaker.$v;
      }
    }
  }

  self
end

#method(name) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 24

def method(name)
  %x{
    var meth = self['$' + name];

    if (!meth || meth.rb_stub) {
      #{raise NameError, "undefined method `#{name}' for class `#{self.class.name}'"};
    }

    return #{Method.new(self, `meth`, name)};
  }
end

#methods(all = true) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 36

def methods(all = true)
  %x{
    var methods = [];

    for (var key in self) {
      if (key[0] == "$" && typeof(self[key]) === "function") {
        if (all == false || all === nil) {
          if (!$opal.hasOwnProperty.call(self, key)) {
            continue;
          }
        }
        if (self[key].rb_stub === undefined) {
          methods.push(key.substr(1));
        }
      }
    }

    return methods;
  }
end

#nil? ⇒ Boolean

Returns:

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# File 'opal/opal/corelib/kernel.rb', line 412

def nil?
  false
end

#p(*args) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 443

def p(*args)
  args.each { |obj| $stdout.puts obj.inspect }

  args.length <= 1 ? args[0] : args
end

#print(*strs) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 449

def print(*strs)
  $stdout.print(*strs)
end

#printf(*args) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 418

def printf(*args)
  if args.length > 0
    print format(*args)
  end

  nil
end

#private_methods ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 426

def private_methods
  []
end

#proc(&block) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 430

def proc(&block)
  unless block
    raise ArgumentError, "tried to create Proc object without a block"
  end

  `block.is_lambda = false`
  block
end

#puts(*strs) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 439

def puts(*strs)
  $stdout.puts(*strs)
end

#raise(exception = undefined, string = undefined) ⇒ Object Also known as: fail

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# File 'opal/opal/corelib/kernel.rb', line 458

def raise(exception = undefined, string = undefined)
  %x{
    if (exception == null && #$!) {
      exception = #$!;
    }
    else if (exception._isString) {
      exception = #{RuntimeError.new exception};
    }
    else if (!#{exception.is_a? Exception}) {
      exception = #{exception.new string};
    }

    #{$! = exception};
    throw exception;
  }
end

#rand(max = undefined) ⇒ Object Also known as: srand

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# File 'opal/opal/corelib/kernel.rb', line 477

def rand(max = undefined)
  %x{
    if (max === undefined) {
      return Math.random();
    }
    else if (max._isRange) {
      var arr = #{max.to_a};

      return arr[#{rand(`arr.length`)}];
    }
    else {
      return Math.floor(Math.random() *
        Math.abs(#{Opal.coerce_to max, Integer, :to_int}));
    }
  }
end

#respond_to?(name, include_all = false) ⇒ Boolean

Returns:

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# File 'opal/opal/corelib/kernel.rb', line 496

def respond_to?(name, include_all = false)
  return true if respond_to_missing?(name)

  %x{
    var body = self['$' + name];

    if (typeof(body) === "function" && !body.rb_stub) {
      return true;
    }
  }

  false
end

#respond_to_missing?(method_name) ⇒ Boolean

Returns:

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# File 'opal/opal/corelib/kernel.rb', line 590

def respond_to_missing?(method_name)
  false
end

#singleton_class ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 513

def singleton_class
  %x{
    if (self._isClass) {
      if (self.__meta__) {
        return self.__meta__;
      }

      var meta = new $opal.Class._alloc;
      meta._klass = $opal.Class;
      self.__meta__ = meta;
      // FIXME - is this right? (probably - methods defined on
      // class' singleton should also go to subclasses?)
      meta._proto = self.constructor.prototype;
      meta._isSingleton = true;
      meta.__inc__ = [];
      meta._methods = [];

      meta._scope = self._scope;

      return meta;
    }

    if (self._isClass) {
      return self._klass;
    }

    if (self.__meta__) {
      return self.__meta__;
    }

    else {
      var orig_class = self._klass,
          class_id   = "#<Class:#<" + orig_class._name + ":" + orig_class._id + ">>";

      var Singleton = function () {};
      var meta = Opal.boot(orig_class, Singleton);
      meta._name = class_id;

      meta._proto = self;
      self.__meta__ = meta;
      meta._klass = orig_class._klass;
      meta._scope = orig_class._scope;
      meta.__parent = orig_class;

      return meta;
    }
  }
end

#String(str) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 564

def String(str)
  `String(str)`
end

#tap {|_self| ... } ⇒ Object

Yields:

  • (_self)

Yield Parameters:

  • _self (Kernel) —

    the object that the method was called on

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# File 'opal/opal/corelib/kernel.rb', line 568

def tap(&block)
  yield self
  self
end

#to_proc ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 573

def to_proc
  self
end

#to_s ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 577

def to_s
  `"#<" + #{self.class.name} + ":" + self._id + ">"`
end

#warn(*strs) ⇒ Object

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# File 'opal/opal/corelib/kernel.rb', line 453

def warn(*strs)
  $stderr.puts(*strs) unless $VERBOSE.nil? || strs.empty?
  nil
end