Class: Kalc::Environment

Inherits:
Object
  • Object
show all
Defined in:
lib/kalc/environment.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(parent = nil) {|_self| ... } ⇒ Environment

Returns a new instance of Environment.

Yields:

  • (_self)

Yield Parameters:



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# File 'lib/kalc/environment.rb', line 7

def initialize(parent = nil)
  @functions = {}
  @variables = {}
  @parent = parent
  yield self if block_given?
end

Instance Attribute Details

#functions ⇒ Object (readonly)

Returns the value of attribute functions.



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# File 'lib/kalc/environment.rb', line 4

def functions
  @functions
end

#variables ⇒ Object (readonly)

Returns the value of attribute variables.



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# File 'lib/kalc/environment.rb', line 5

def variables
  @variables
end

Instance Method Details

#add_function(name, value) ⇒ Object 



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# File 'lib/kalc/environment.rb', line 14

def add_function(name, value)
  @functions.update({ name.to_s.strip => value })
end

#add_variable(name, value) ⇒ Object 



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# File 'lib/kalc/environment.rb', line 28

def add_variable(name, value)
  @variables.update({ name.to_s.strip => value })
  value
end

#get_function(name) ⇒ Object 



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# File 'lib/kalc/environment.rb', line 18

def get_function(name)
  if fun = @functions[name.to_s.strip]
    fun
  elsif !@parent.nil?
    @parent.get_function(name)
  else
    nil
  end
end

#get_variable(name) ⇒ Object 



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# File 'lib/kalc/environment.rb', line 33

def get_variable(name)
  if var = @variables[name.to_s.strip]
    var
  elsif !@parent.nil?
    @parent.get_variable(name)
  else
    nil
  end
end