123456789_123456789_123456789_123456789_123456789_

Class: TZInfo::UnaryMinusGlobalStringDeduper Private

Do not use. This class is for internal use only.
Relationships & Source Files
Inherits: Object
Defined in: lib/tzinfo/string_deduper.rb

Overview

An implementation of StringDeduper using the String#-@ method where that method performs deduplication (Ruby 2.5 and later).

Note that this is slightly different to the plain StringDeduper implementation. In this implementation, frozen literal strings are already in the pool and are candidates for being returned, even when passed another equal frozen non-literal string. StringDeduper will always return frozen strings.

There are also differences in encoding handling. This implementation will treat strings with different encodings as different strings. StringDeduper will treat strings with the compatible encodings as the same string.

Instance Method Summary

Instance Method Details

#dedupe(string) ⇒ bool

Parameters:

  • string (String) —

    the string to deduplicate.

Returns:

  • (bool) —

    string if it is frozen, otherwise a frozen, possibly pre-existing copy of string.

[ GitHub ] 

  


# File 'lib/tzinfo/string_deduper.rb', line 94



def dedupe(string)
  # String#-@ on Ruby 2.6 will dedupe a frozen non-literal String. Ruby
  # 2.5 will just return frozen strings.
  #
  # The pooled implementation can't tell the difference between frozen
  # literals and frozen non-literals, so must always return frozen String
  # instances to avoid doing unncessary work when loading format 2
  # TZInfo::Data modules.
  #
  # For compatibility with the pooled implementation, just return frozen
  # string instances (acting like Ruby 2.5).
  return string if string.frozen?
  -string
end