class Sass::Environment

so that they can be made available to {Sass::Script::Functions}.
Environment also keeps track of the {Engine} options
but new variables are defined locally.
so it has access to variables defined in enclosing scopes,
The new environment refers to the environment in the upper scope,
This allows variables to be lexically scoped.
A new environment is created for each level of Sass nesting.
This keeps track of variable and mixin definitions.
The lexical environment for SassScript.

def inherited_hash(name)

update haml/yard/inherited_hash.rb as well.
Note: when updating this, 
def inherited_hash(name)
  class_eval <<RUBY, __FILE__, __LINE__ + 1
    def #{name}(name)
      @#{name}s[name] || @parent && @parent.#{name}(name)
    end
    def set_#{name}(name, value)
      @#{name}s[name] = value unless try_set_#{name}(name, value)
    end
    def try_set_#{name}(name, value)
      if @#{name}s.include?(name)
        @#{name}s[name] = value
        true
      elsif @parent
        @parent.try_set_#{name}(name, value)
      else
        false
      end
    end
    protected :try_set_#{name}
    def set_local_#{name}(name, value)
      @#{name}s[name] = value
    end
end

def initialize(parent = nil)

Parameters:
  • parent (Environment) -- See \{#parent} 
def initialize(parent = nil)
  @vars = {}
  @mixins = {}
  @parent = parent
  set_var("important", Script::String.new("!important")) unless @parent
end

def options

Returns:
  • (Hash) - 
def options
  @options || (parent && parent.options) || {}
end