Class: Keisan::Calculator

Inherits:
Object
  • Object
show all
Defined in:
lib/keisan/calculator.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(context = nil) ⇒ Calculator

Returns a new instance of Calculator.



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# File 'lib/keisan/calculator.rb', line 5

def initialize(context = nil)
  @context = context || Context.new
end

Instance Attribute Details

#context ⇒ Object (readonly)

Returns the value of attribute context.



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# File 'lib/keisan/calculator.rb', line 3

def context
  @context
end

Instance Method Details

#define_function!(name, function) ⇒ Object 



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# File 'lib/keisan/calculator.rb', line 28

def define_function!(name, function)
  context.register_function!(name, function)
end

#define_variable!(name, value) ⇒ Object 



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# File 'lib/keisan/calculator.rb', line 24

def define_variable!(name, value)
  context.register_variable!(name, value)
end

#evaluate(expression, definitions = {}) ⇒ Object 



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# File 'lib/keisan/calculator.rb', line 9

def evaluate(expression, definitions = {})
  context.spawn_child do |local|
    definitions.each do |name, value|
      case value
      when Proc
        local.register_function!(name, value)
      else
        local.register_variable!(name, value)
      end
    end

    Keisan::AST::Builder.new(string: expression).ast.value(local)
  end
end