Class: ExpressionInterpreter::Expression

Inherits:

Object

• Object
• ExpressionInterpreter::Expression

Defined in:

lib/expression_interpreter.rb

Instance Method Summary

• #evaluate(&var) ⇒ Object
• #initialize(expression) ⇒ Expression constructor

  A new instance of Expression.

• #to_s ⇒ Object

Constructor Details

#initialize(expression) ⇒ Expression

Returns a new instance of Expression.

# File 'lib/expression_interpreter.rb', line 4

def initialize(expression)
  parser = Parser.new(expression)
  @operation = parser.operation
  @variables = parser.variables
end

Instance Method Details

#evaluate(&var) ⇒ Object

# File 'lib/expression_interpreter.rb', line 10

def evaluate(&var)
  context = Context.new
  @variables.each do |variable|
    context.assign(variable, yield(variable.name))
  end
  @operation.evaluate(context)
end

#to_s ⇒ Object

# File 'lib/expression_interpreter.rb', line 18

def to_s
  @operation.to_s
end