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kernel_gem.rb
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kernel_require.rb
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Editing: kernel_require.rb
# frozen_string_literal: true #-- # Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others. # All rights reserved. # See LICENSE.txt for permissions. #++ require 'monitor' module Kernel RUBYGEMS_ACTIVATION_MONITOR = Monitor.new # :nodoc: if defined?(gem_original_require) then # Ruby ships with a custom_require, override its require remove_method :require else ## # The Kernel#require from before RubyGems was loaded. alias gem_original_require require private :gem_original_require end ## # When RubyGems is required, Kernel#require is replaced with our own which # is capable of loading gems on demand. # # When you call <tt>require 'x'</tt>, this is what happens: # * If the file can be loaded from the existing Ruby loadpath, it # is. # * Otherwise, installed gems are searched for a file that matches. # If it's found in gem 'y', that gem is activated (added to the # loadpath). # # The normal <tt>require</tt> functionality of returning false if # that file has already been loaded is preserved. def require path RUBYGEMS_ACTIVATION_MONITOR.enter path = path.to_path if path.respond_to? :to_path spec = Gem.find_unresolved_default_spec(path) if spec Gem.remove_unresolved_default_spec(spec) Kernel.send(:gem, spec.name) end # If there are no unresolved deps, then we can use just try # normal require handle loading a gem from the rescue below. if Gem::Specification.unresolved_deps.empty? then RUBYGEMS_ACTIVATION_MONITOR.exit return gem_original_require(path) end # If +path+ is for a gem that has already been loaded, don't # bother trying to find it in an unresolved gem, just go straight # to normal require. #-- # TODO request access to the C implementation of this to speed up RubyGems spec = Gem::Specification.find_active_stub_by_path path begin RUBYGEMS_ACTIVATION_MONITOR.exit return gem_original_require(path) end if spec # Attempt to find +path+ in any unresolved gems... found_specs = Gem::Specification.find_in_unresolved path # If there are no directly unresolved gems, then try and find +path+ # in any gems that are available via the currently unresolved gems. # For example, given: # # a => b => c => d # # If a and b are currently active with c being unresolved and d.rb is # requested, then find_in_unresolved_tree will find d.rb in d because # it's a dependency of c. # if found_specs.empty? then found_specs = Gem::Specification.find_in_unresolved_tree path found_specs.each do |found_spec| found_spec.activate end # We found +path+ directly in an unresolved gem. Now we figure out, of # the possible found specs, which one we should activate. else # Check that all the found specs are just different # versions of the same gem names = found_specs.map(&:name).uniq if names.size > 1 then RUBYGEMS_ACTIVATION_MONITOR.exit raise Gem::LoadError, "#{path} found in multiple gems: #{names.join ', '}" end # Ok, now find a gem that has no conflicts, starting # at the highest version. valid = found_specs.reject { |s| s.has_conflicts? }.first unless valid then le = Gem::LoadError.new "unable to find a version of '#{names.first}' to activate" le.name = names.first RUBYGEMS_ACTIVATION_MONITOR.exit raise le end valid.activate end RUBYGEMS_ACTIVATION_MONITOR.exit return gem_original_require(path) rescue LoadError => load_error RUBYGEMS_ACTIVATION_MONITOR.enter begin if load_error.message.start_with?("Could not find") or (load_error.message.end_with?(path) and Gem.try_activate(path)) then require_again = true end ensure RUBYGEMS_ACTIVATION_MONITOR.exit end return gem_original_require(path) if require_again raise load_error end private :require end
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