Class: Keisan::AST::Plus

Inherits:
ArithmeticOperator show all
Defined in:
lib/keisan/ast/plus.rb

Instance Attribute Summary

Attributes inherited from Parent

#children

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from ArithmeticOperator

#associativity

Methods inherited from Operator

#associativity

Constructor Details

#initialize(children = [], parsing_operators = []) ⇒ Plus

Returns a new instance of Plus.



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# File 'lib/keisan/ast/plus.rb', line 4

def initialize(children = [], parsing_operators = [])
  super
  convert_minus_to_plus!
end

Class Method Details

.priority ⇒ Object 



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# File 'lib/keisan/ast/plus.rb', line 9

def self.priority
  10
end

Instance Method Details

#arity ⇒ Object 



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# File 'lib/keisan/ast/plus.rb', line 13

def arity
  2..Float::INFINITY
end

#blank_value ⇒ Object 



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# File 'lib/keisan/ast/plus.rb', line 21

def blank_value
  0
end

#symbol ⇒ Object 



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# File 'lib/keisan/ast/plus.rb', line 17

def symbol
  :+
end

#value(context = nil) ⇒ Object 



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# File 'lib/keisan/ast/plus.rb', line 25

def value(context = nil)
  children_values = children.map {|child| child.value(context)}
  # Special case of string concatenation
  if children_values.all? {|child| child.is_a?(::String)}
    children_values.join
  # Special case of array concatenation
  elsif children_values.all? {|child| child.is_a?(::Array)}
    children_values.inject([], &:+)
  else
    children_values.inject(0, &:+)
  end
end