Class: Minjs::ECMA262::ExpParen

Inherits:
Expression show all
Defined in:
lib/minjs/ecma262/expression.rb

Overview

Class of the Grouping operator expression element.

See Also:

Instance Attribute Summary collapse

Attributes inherited from Base

#parent

Instance Method Summary collapse

Methods inherited from Expression

#reduce, #side_effect?

Methods inherited from Base

#add_remove_paren, #concat

Constructor Details

#initialize(val) ⇒ ExpParen

Returns a new instance of ExpParen.



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# File 'lib/minjs/ecma262/expression.rb', line 324

def initialize(val)
  @val = val
end

Instance Attribute Details

#val ⇒ Object (readonly)

Returns the value of attribute val.



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# File 'lib/minjs/ecma262/expression.rb', line 322

def val
  @val
end

Instance Method Details

#==(obj) ⇒ Object

compare object



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# File 'lib/minjs/ecma262/expression.rb', line 355

def ==(obj)
  self.class == obj.class and @val == obj.val
end

#add_paren ⇒ Object

add parenthesis if need



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# File 'lib/minjs/ecma262/expression.rb', line 395

def add_paren
  self
end

#deep_dup ⇒ Object

duplicate object

See Also:



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# File 'lib/minjs/ecma262/expression.rb', line 335

def deep_dup
  self.class.new(@val.deep_dup)
end

#ecma262_typeof ⇒ Symbol

return results of ‘typeof’ operator.

Returns:

  • (Symbol) —

    type of val



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# File 'lib/minjs/ecma262/expression.rb', line 416

def ecma262_typeof
  if @val.respond_to? :ecma262_typeof
    @val.ecma262_typeof
  else
    nil
  end
end

#left_hand_side_exp? ⇒ Boolean

Returns true if expression is kind of LeftHandSideExpression.

Returns:

  • (Boolean) —

    true if expression is kind of LeftHandSideExpression.



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# File 'lib/minjs/ecma262/expression.rb', line 366

def left_hand_side_exp?
  true
end

#priority ⇒ Fixnum

Returns expression priority.

Returns:

  • (Fixnum) —

    expression priority



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# File 'lib/minjs/ecma262/expression.rb', line 329

def priority
  PRIORITY_PRIMARY
end

#remove_paren ⇒ Object

remove parenthesis if possible



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# File 'lib/minjs/ecma262/expression.rb', line 387

def remove_paren
  if @val.kind_of? ExpParen
    @val = @val.val if @val.remove_paren?
  end
  self
end

#remove_paren? ⇒ Boolean

returns removing parenthesis is possible or not

ECMA262 expression-statement should not start with “function” or “{”. This method checks inner of the parenthesis’ first literal.

Returns:



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# File 'lib/minjs/ecma262/expression.rb', line 377

def remove_paren?
  js = @val.to_js
  if js.match(/^function/) or js.match(/^{/)
    false
  else
    true
  end
end

#replace(from, to) ⇒ Object

Replaces children object.

See Also:



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# File 'lib/minjs/ecma262/expression.rb', line 341

def replace(from, to)
  if @val .eql? from
    @val = to
  end
end

#to_ecma262_boolean ⇒ Boolean

Returns results of ToBoolean()

Returns true or false if trivial, otherwise nil.

Returns:

See Also:



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# File 'lib/minjs/ecma262/expression.rb', line 407

def to_ecma262_boolean
  return nil unless @val.respond_to? :to_ecma262_boolean
  return nil if @val.to_ecma262_boolean.nil?
  @val.to_ecma262_boolean
end

#to_js(options = {}) ⇒ Object

Returns a ECMAScript string containg the representation of element.

See Also:



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# File 'lib/minjs/ecma262/expression.rb', line 361

def to_js(options = {})
  "(#{@val.to_js(options)})"
end

#traverse(parent) {|parent, _self| ... } ⇒ Object

Traverses this children and itself with given block.

Yields:

Yield Parameters:

See Also:



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# File 'lib/minjs/ecma262/expression.rb', line 349

def traverse(parent, &block)
  @val.traverse(self, &block)
  yield parent, self
end