Class: Proc

Inherits:
Object show all
Defined in:
opal/opal/corelib/proc.rb,
opal/opal/corelib/marshal/write_buffer.rb more...

Overview

helpers: slice

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 7

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

  block
end

Instance Method Details

#<<(other) ⇒ Object

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# File 'opal/opal/corelib/proc.rb', line 64

def <<(other)
  proc do |*args, &block|
    out = other.call(*args, &block)
    call(out)
  end
end

#>>(other) ⇒ Object

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

def >>(other)
  proc do |*args, &block|
    out = call(*args, &block)
    other.call(out)
  end
end

#__marshal__(buffer) ⇒ Object

Raises:

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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 95

def __marshal__(buffer)
  raise TypeError, "no _dump_data is defined for class #{self.class}"
end

#arity ⇒ Object

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# File 'opal/opal/corelib/proc.rb', line 81

def arity
  %x{
    if (self.$$is_curried) {
      return -1;
    } else {
      return self.$$arity;
    }
  }
end

#binding ⇒ Object

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

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

  if defined? Binding
    Binding.new(nil, [], `self.$$s`, source_location)
  end
end

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

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# File 'opal/opal/corelib/proc.rb', line 15

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

    var result, $brk = self.$$brk;

    if ($brk) {
      try {
        if (self.$$is_lambda) {
          result = self.apply(null, args);
        }
        else {
          result = Opal.yieldX(self, args);
        }
      } catch (err) {
        if (err === $brk) {
          return $brk.$v
        }
        else {
          throw err
        }
      }
    }
    else {
      if (self.$$is_lambda) {
        result = self.apply(null, args);
      }
      else {
        result = Opal.yieldX(self, args);
      }
    }

    return result;
  }
end

#curry(arity = undefined) ⇒ Object

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# File 'opal/opal/corelib/proc.rb', line 133

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 174

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 75

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 104

def parameters
  %x{
    if (self.$$is_curried) {
      return #{[[:rest]]};
    } else if (self.$$parameters) {
      if (self.$$is_lambda) {
        return self.$$parameters;
      } else {
        var result = [], i, length;

        for (i = 0, length = self.$$parameters.length; i < length; i++) {
          var parameter = self.$$parameters[i];

          if (parameter[0] === 'req') {
            // required arguments always have name
            parameter = ['opt', parameter[1]];
          }

          result.push(parameter);
        }

        return result;
      }
    } else {
      return [];
    }
  }
end

#source_location ⇒ Object

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# File 'opal/opal/corelib/proc.rb', line 91

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 71

def to_proc
  self
end