Class: Proc

Inherits:
Object show all
Defined in:
opal/opal/corelib/proc.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.new(&block) ⇒ Object 



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# File 'opal/opal/corelib/proc.rb', line 5

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

  block
end

Instance Method Details

#arity ⇒ Object

FIXME: this should support the various splats and optional arguments



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# File 'opal/opal/corelib/proc.rb', line 51

def arity
  `if (self.$$is_curried) { return -1; }`
  `if (self.$$arity) { return self.$$arity }`
  `self.length`
end

#binding ⇒ Object 



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# File 'opal/opal/corelib/proc.rb', line 62

def binding
  `if (self.$$is_curried) { #{raise ArgumentError, "Can't create Binding"} }`
  nil
end

#call(*args, &block) ⇒ Object Also known as: [], ===, yield 



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# File 'opal/opal/corelib/proc.rb', line 13

def call(*args, &block)
  %x{
    if (block !== nil) {
      self.$$p = block;
    }

    var result;

    if (self.$$is_lambda) {
      result = self.apply(null, args);
    }
    else {
      result = Opal.yieldX(self, args);
    }

    if (result === $breaker) {
      return $breaker.$v;
    }

    return result;
  }
end

#curry(arity = undefined) ⇒ Object 



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# File 'opal/opal/corelib/proc.rb', line 72

def curry(arity = undefined)
  %x{
    if (arity === undefined) {
      arity = self.length;
    }
    else {
      arity = #{Opal.coerce_to!(arity, Integer, :to_int)};
      if (self.$$is_lambda && arity !== self.length) {
        #{raise ArgumentError, "wrong number of arguments (#{`arity`} for #{`self.length`})"}
      }
    }

    function curried () {
      var args = $slice.call(arguments),
          length = args.length,
          result;

      if (length > arity && self.$$is_lambda && !self.$$is_curried) {
        #{raise ArgumentError, "wrong number of arguments (#{`length`} for #{`arity`})"}
      }

      if (length >= arity) {
        return self.$call.apply(self, args);
      }

      result = function () {
        return curried.apply(null,
          args.concat($slice.call(arguments)));
      }
      result.$$is_lambda = self.$$is_lambda;
      result.$$is_curried = true;

      return result;
    };

    curried.$$is_lambda = self.$$is_lambda;
    curried.$$is_curried = true;
    return curried;
  }
end

#dup ⇒ Object Also known as: clone 



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# File 'opal/opal/corelib/proc.rb', line 113

def dup
  %x{
    var original_proc = self.$$original_proc || self,
        proc = function () {
          return original_proc.apply(this, arguments);
        };

    for (var prop in self) {
      if (self.hasOwnProperty(prop)) {
        proc[prop] = self[prop];
      }
    }

    return proc;
  }
end

#lambda? ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/proc.rb', line 44

def lambda?
  # This method should tell the user if the proc tricks are unavailable,
  # (see Proc#lambda? on ruby docs to find out more).
  `!!self.$$is_lambda`
end

#parameters ⇒ Object 



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# File 'opal/opal/corelib/proc.rb', line 67

def parameters
  `if (self.$$is_curried) { return #{[[:rest]]}; }`
  nil
end

#source_location ⇒ Object 



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

def source_location
  `if (self.$$is_curried) { return nil; }`
  nil
end

#to_proc ⇒ Object 



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# File 'opal/opal/corelib/proc.rb', line 40

def to_proc
  self
end