Class: Dentaku::AST::Subtraction

Inherits:
Arithmetic show all
Defined in:
lib/dentaku/ast/arithmetic.rb

Constant Summary

Constants inherited from Arithmetic

Arithmetic::DECIMAL, Arithmetic::INTEGER

Instance Attribute Summary

Attributes inherited from Operation

#left, #right

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Arithmetic

#initialize, #type

Methods inherited from Operation

#accept, #dependencies, #display_operator, #initialize, max_param_count, min_param_count, right_associative?

Methods inherited from Node

arity, #dependencies, #name, resolve_class, #type

Constructor Details

This class inherits a constructor from Dentaku::AST::Arithmetic

Class Method Details

.precedence ⇒ Object 



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# File 'lib/dentaku/ast/arithmetic.rb', line 137

def self.precedence
  10
end

Instance Method Details

#operator ⇒ Object 



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# File 'lib/dentaku/ast/arithmetic.rb', line 133

def operator
  :-
end

#value(context = {}) ⇒ Object 



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# File 'lib/dentaku/ast/arithmetic.rb', line 141

def value(context = {})
  left_value = left.value(context)
  right_value = right.value(context)

  if left.type == :datetime || datetime?(left_value)
    Dentaku::DateArithmetic.new(left_value).sub(right_value)
  else
    calculate(left_value, right_value)
  end
end