Class: Keisan::AST::Cache

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

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Cache

Returns a new instance of Cache.



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# File 'lib/keisan/ast/cache.rb', line 4

def initialize
  @cache = {}
end

Instance Method Details

#fetch_or_build(string) ⇒ Object 



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# File 'lib/keisan/ast/cache.rb', line 8

def fetch_or_build(string)
  return @cache[string] if @cache.has_key?(string)

  build_from_scratch(string).tap do |ast|
    unless frozen?
      # Freeze the AST to keep it from changing in the cache
      ast.freeze
      @cache[string] = ast
    end
  end
end

#has_key?(string) ⇒ Boolean

Returns:



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# File 'lib/keisan/ast/cache.rb', line 20

def has_key?(string)
  @cache.has_key?(string)
end