Class: Code::Node::IfModifier

Inherits:
Code::Node show all
Defined in:
lib/code/node/if_modifier.rb

Constant Summary collapse

IF_KEYWORD = 
:if
UNLESS_KEYWORD = 
:unless
WHILE_KEYWORD = 
:while
UNTIL_KEYWORD = 
:until

Instance Method Summary collapse

Constructor Details

#initialize(if_modifier) ⇒ IfModifier

Returns a new instance of IfModifier.



9
10
11
12
13
 
# File 'lib/code/node/if_modifier.rb', line 9

def initialize(if_modifier)
  @left = ::Code::Node::Statement.new(if_modifier.fetch(:left))
  @operator = if_modifier.fetch(:operator)
  @right = ::Code::Node::Statement.new(if_modifier.fetch(:right))
end

Instance Method Details

#evaluate(**args) ⇒ Object 



15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
 
# File 'lib/code/node/if_modifier.rb', line 15

def evaluate(**args)
  if operator == IF_KEYWORD
    right = @right.evaluate(**args)

    right.truthy? ? @left.evaluate(**args) : ::Code::Object::Nothing.new
  elsif operator == UNLESS_KEYWORD
    right = @right.evaluate(**args)

    right.truthy? ? ::Code::Object::Nothing.new : @left.evaluate(**args)
  elsif operator == WHILE_KEYWORD
    left = ::Code::Object::Nothing.new

    left = @left.evaluate(**args) while @right.evaluate(**args).truthy?

    left
  elsif operator == UNTIL_KEYWORD
    left = ::Code::Object::Nothing.new

    left = @left.evaluate(**args) until @right.evaluate(**args).truthy?

    left
  else
    raise NotImplementedError.new(operator.inspect)
  end
end