Module: Opal

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

Overview

helpers: type_error, coerce_to

Class Method Summary collapse

Class Method Details

.bridge(constructor, klass) ⇒ Object


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# File 'opal/opal/corelib/helpers.rb', line 4

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

.class_variable_name!(name) ⇒ Object


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# File 'opal/opal/corelib/helpers.rb', line 87

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

  if `name.length < 3 || name.slice(0,2) !== '@@'`
    raise NameError.new("`#{name}' is not allowed as a class variable name", name)
  end

  name
end

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


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# File 'opal/opal/corelib/helpers.rb', line 8

def self.coerce_to!(object, type, method, *args)
  coerced = `$coerce_to(object, type, method, args)`

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

  coerced
end

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

Returns:


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# File 'opal/opal/corelib/helpers.rb', line 18

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

  coerced = `$coerce_to(object, type, method, args)`

  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 40

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 97

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 50

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

.instance_variable_name!(name) ⇒ Object


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# File 'opal/opal/corelib/helpers.rb', line 77

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 133

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

      if (method && !method.$$stub) {
        method.$$pristine = true;
      }
    }
  }
  nil
end

.respond_to?(obj, method, include_all = false) ⇒ Boolean

Returns:


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

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

  obj.respond_to?(method, include_all)
end

.try_convert(object, type, method) ⇒ Object


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# File 'opal/opal/corelib/helpers.rb', line 32

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

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