Nick LaMuro a822fc513c Cache regexps generated from acronym_regex ... The Problem ----------- The following line from `String#camelize`: string = string.sub(/^(?:#{inflections.acronym_regex}(?=\b|[A-Z_])|\w)/) { |match| match.downcase } and the following line from `String#camelize`: word.gsub!(/(?:(?<=([A-Za-z\d]))|\b)(#{inflections.acronym_regex})(?=\b|[^a-z])/) { "#{$1 && '_'.freeze }#{$2.downcase}" }#{$2.downcase}" } Both generate the same regexep in the first part of the `.sub`/`.gsub` method calls every time the function is called, creating an extra object allocation each time. The value of `acronym_regex` only changes if the user decides add an acronym to the current set of inflections and apends another string on the the regexp generated here, but beyond that it remains relatively static. This has been around since acronym support was introduced back in 2011 in PR#1648. Proposed Solution ----------------- To avoid re-generating these strings every time these methods are called, cache the values of these regular expressions in the `ActiveSupport::Inflector::Inflections` instance, making it so these regular expressions are only generated once, or when the acronym's are added to. Other notable changes is the attr_readers are nodoc'd, as they shouldn't really be public APIs for users. Also, the new method, define_acronym_regex_patterns, is the only method in charge of manipulating @acronym_regex, and initialize_dup also makes use of that new change. ** Note about fix for non-deterministic actionpack test ** With the introduction of `@acronym_underscore_regex` and `@acronym_camelize_regex`, tests that manipulated these for a short time, then reset them could caused test failures to happen. This happened because the previous way we reset the `@acronyms` and `@acronym_regex` was the set them using #instance_variable_set, which wouldn't run the #define_acronym_regex_patterns method. This has now been introduced into the actionpack tests to avoid this failure.		2017-10-23 16:13:14 -05:00
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active_support	Cache regexps generated from acronym_regex	2017-10-23 16:13:14 -05:00
active_support.rb	[Active Support] require_relative => require	2017-10-21 22:48:27 +09:00