Load SnippetExtractor and Source classes lazily

Author: yujinakayama

lib/rspec/core/formatters/exception_presenter.rb

@@ -1,5 +1,5 @@
 # encoding: utf-8
-RSpec::Support.require_rspec_core "formatters/snippet_extractor"
+RSpec::Support.require_rspec_support "encoded_string"
 
 module RSpec
   module Core
@@ -178,6 +178,7 @@ def read_failed_lines
 
           file_path, line_number = matching_line.match(/(.+?):(\d+)(|:\d+)/)[1..2]
           max_line_count = RSpec.configuration.max_displayed_failure_line_count
+          RSpec::Support.require_rspec_core "formatters/snippet_extractor"
           SnippetExtractor.extract_expression_lines_at(file_path, line_number.to_i, max_line_count)
         rescue SnippetExtractor::NoSuchFileError
           ["Unable to find #{file_path} to read failed line"]

lib/rspec/core/notifications.rb

@@ -1,7 +1,6 @@
 RSpec::Support.require_rspec_core "formatters/exception_presenter"
 RSpec::Support.require_rspec_core "formatters/helpers"
 RSpec::Support.require_rspec_core "shell_escape"
-RSpec::Support.require_rspec_support "encoded_string"
 
 module RSpec::Core
   # Notifications are value objects passed to formatters to provide them

lib/rspec/core/source.rb

@@ -1,6 +1,3 @@
-RSpec::Support.require_rspec_core "source/node"
-RSpec::Support.require_rspec_core "source/token"
-
 module RSpec
   module Core
     # @private
@@ -25,6 +22,7 @@ def lines
       def ast
         @ast ||= begin
           require 'ripper'
+          RSpec::Support.require_rspec_core "source/node"
           sexp = Ripper.sexp(source)
           Node.new(sexp)
         end
@@ -33,6 +31,7 @@ def ast
       def tokens
         @tokens ||= begin
           require 'ripper'
+          RSpec::Support.require_rspec_core "source/token"
           tokens = Ripper.lex(source)
           Token.tokens_from_ripper_tokens(tokens)
         end