Class: Hotdog::Commands::Search::BinaryExpressionNode

Inherits:
ExpressionNode
  • Object
show all
Defined in:
lib/hotdog/commands/search.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(op, left, right) ⇒ BinaryExpressionNode 



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# File 'lib/hotdog/commands/search.rb', line 177

def initialize(op, left, right)
  @op = op
  @left = left
  @right = right
end

Instance Attribute Details

#left ⇒ Object (readonly)

Returns the value of attribute left.



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# File 'lib/hotdog/commands/search.rb', line 175

def left
  @left
end

#right ⇒ Object (readonly)

Returns the value of attribute right.



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# File 'lib/hotdog/commands/search.rb', line 175

def right
  @right
end

Instance Method Details

#evaluate(environment) ⇒ Object 



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# File 'lib/hotdog/commands/search.rb', line 182

def evaluate(environment)
  case @op
  when "&&", "&", /\Aand\z/i
    left_values = @left.evaluate(environment)
    if left_values.empty?
      []
    else
      right_values = @right.evaluate(environment)
      (left_values & right_values)
    end
  when "||", "|", /\Aor\z/i
    left_values = @left.evaluate(environment)
    right_values = @right.evaluate(environment)
    (left_values | right_values).uniq
  else
    raise(SyntaxError.new("unknown binary operator: #{@op}"))
  end
end