Remove ActiveSupport dependency

Author: a2ikm

lib/line/bot/client.rb

@@ -17,7 +17,6 @@
 require 'base64'
 require 'net/http'
 require 'openssl'
-require 'active_support/core_ext/string/inflections'
 
 module Line
   module Bot
@@ -419,7 +418,7 @@ def parse_events_from(request_body)
 
         json['events'].map { |item|
           begin
-            klass = Line::Bot::Event.const_get(item['type'].camelize)
+            klass = Line::Bot::Event.const_get(camelize(item['type']))
             klass.new(item)
           rescue NameError => e
             Line::Bot::Event::Base.new(item)
@@ -463,6 +462,11 @@ def secure_compare(a, b)
         b.each_byte { |byte| res |= byte ^ l.shift }
         res == 0
       end
+
+      # @return [String]
+      def camelize(string)
+        string.split(/_|(?=[A-Z])/).map(&:capitalize).join
+      end
     end
   end
 end

line-bot-api.gemspec

@@ -19,8 +19,6 @@ Gem::Specification.new do |spec|
 
   spec.required_ruby_version     = '>= 2.0.0'
 
-  spec.add_runtime_dependency "activesupport"
-
   spec.add_development_dependency "addressable", "~> 2.3"
   spec.add_development_dependency "bundler", "~> 1.11"
   spec.add_development_dependency 'rake', "~> 10.4"