Module: Opal

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

Class Method Summary collapse

Class Method Details

.bridge(klass, constructor) ⇒ Object 



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

def self.bridge(klass, constructor)
  `Opal.bridge(klass, constructor)`
end

.coerce_to(object, type, method) ⇒ Object 



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

def self.coerce_to(object, type, method)
  return object if type === object

  unless object.respond_to? method
    raise type_error(object, type)
  end

  object.__send__ method
end

.coerce_to!(object, type, method) ⇒ Object 



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

def self.coerce_to!(object, type, method)
  coerced = coerce_to(object, type, method)

  unless type === coerced
    raise type_error(object, type, method, coerced)
  end

  coerced
end

.coerce_to?(object, type, method) ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/helpers.rb', line 34

def self.coerce_to?(object, type, method)
  return unless object.respond_to? method

  coerced = coerce_to(object, type, method)

  return if coerced.nil?

  unless type === coerced
    raise type_error(object, type, method, coerced)
  end

  coerced
end

.compare(a, b) ⇒ Object 



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# File 'opal/opal/corelib/helpers.rb', line 56

def self.compare(a, b)
  compare = a <=> b

  if `compare === nil`
    raise ArgumentError, "comparison of #{a.class} with #{b.class} failed"
  end

  compare
end

.const_name!(const_name) ⇒ Object 



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# File 'opal/opal/corelib/helpers.rb', line 120

def self.const_name!(const_name)
  const_name = Opal.coerce_to!(const_name, String, :to_str)

  if const_name[0] != const_name[0].upcase
    raise NameError, "wrong constant name #{const_name}"
  end

  const_name
end

.destructure(args) ⇒ Object 



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# File 'opal/opal/corelib/helpers.rb', line 66

def self.destructure(args)
  %x{
    if (args.length == 1) {
      return args[0];
    }
    else if (args.$$is_array) {
      return args;
    }
    else {
      var args_ary = new Array(args.length);
      for(var i = 0, l = args_ary.length; i < l; i++) { args_ary[i] = args[i]; }

      return args_ary;
    }
  }
end

.inspect(obj) ⇒ Object 



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# File 'opal/opal/corelib/helpers.rb', line 93

def self.inspect(obj)
  %x{
    if (obj === undefined) {
      return "undefined";
    }
    else if (obj === null) {
      return "null";
    }
    else if (!obj.$$class) {
      return obj.toString();
    }
    else {
      return #{obj.inspect};
    }
  }
end

.instance_variable_name!(name) ⇒ Object 



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# File 'opal/opal/corelib/helpers.rb', line 110

def self.instance_variable_name!(name)
  name = Opal.coerce_to!(name, String, :to_str)

  unless `/^@[a-zA-Z_][a-zA-Z0-9_]*?$/.test(name)`
    raise NameError.new("'#{name}' is not allowed as an instance variable name", name)
  end

  name
end

.pristine(owner_class, *method_names) ⇒ nil

Mark some methods as pristine in order to apply optimizations when they are still in their original form. This could probably be moved to the Opal.def() JS API, but for now it will stay manual.

Examples:


Opal.pristine Array, :allocate, :copy_instance_variables, :initialize_dup

class Array
  def dup
    %x{
      if (
        self.$allocate.$$pristine &&
        self.$copy_instance_variables.$$pristine &&
        self.$initialize_dup.$$pristine
      ) return self.slice(0);
    }

    super
  end
end

Parameters:

  • owner_class (Class) —

    the class owning the methods

  • method_names (Array<Symbol>) —

    the list of methods names to mark

Returns:

  • (nil) 


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# File 'opal/opal/corelib/helpers.rb', line 156

def self.pristine owner_class, *method_names
  %x{
    var method_name;
    for (var i = method_names.length - 1; i >= 0; i--) {
      method_name = method_names[i];
      owner_class.$$proto['$'+method_name].$$pristine = true
    }
  }
  nil
end

.respond_to?(obj, method) ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/helpers.rb', line 83

def self.respond_to?(obj, method)
  %x{
    if (obj == null || !obj.$$class) {
      return false;
    }
  }

  obj.respond_to? method
end

.try_convert(object, type, method) ⇒ Object 



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# File 'opal/opal/corelib/helpers.rb', line 48

def self.try_convert(object, type, method)
  return object if type === object

  if object.respond_to? method
    object.__send__ method
  end
end

.type_error(object, type, method = nil, coerced = nil) ⇒ Object 



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

def self.type_error(object, type, method = nil, coerced = nil)
  if method && coerced
    TypeError.new "can't convert #{object.class} into #{type} (#{object.class}##{method} gives #{coerced.class}"
  else
    TypeError.new "no implicit conversion of #{object.class} into #{type}"
  end
end