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Edit File : kernel_require.rb \| Size : 4.33 KB
# 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: # Make sure we have a reference to Ruby's original Kernel#require unless defined?(gem_original_require) # :stopdoc: alias_method :gem_original_require, :require private :gem_original_require # :startdoc: 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) # :doc: return gem_original_require(path) unless Gem.discover_gems_on_require RUBYGEMS_ACTIVATION_MONITOR.synchronize do path = File.path(path) # If +path+ belongs to a default gem, we activate it and then go straight # to normal require if spec = Gem.find_default_spec(path) name = spec.name next if Gem.loaded_specs[name] # Ensure -I beats a default gem resolved_path = begin rp = nil load_path_check_index = Gem.load_path_insert_index - Gem.activated_gem_paths Gem.suffixes.find do \|s\| $LOAD_PATH[0...load_path_check_index].find do \|lp\| if File.symlink? lp # for backward compatibility next end full_path = File.expand_path(File.join(lp, "#{path}#{s}")) rp = full_path if File.file?(full_path) end end rp end Kernel.send(:gem, name, Gem::Requirement.default_prerelease) unless resolved_path next 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? next 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 if Gem::Specification.find_active_stub_by_path(path) next end # 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? found_specs = Gem::Specification.find_in_unresolved_tree path found_specs.each(&:activate) # 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 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.find {\|s\| !s.has_conflicts? } unless valid le = Gem::LoadError.new "unable to find a version of '#{names.first}' to activate" le.name = names.first raise le end valid.activate end end begin gem_original_require(path) rescue LoadError => load_error if load_error.path == path && RUBYGEMS_ACTIVATION_MONITOR.synchronize { Gem.try_activate(path) } return gem_original_require(path) end raise load_error end end private :require end Back

Edit File : kernel_require.rb | Size : 4.33 KB

# 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:

# Make sure we have a reference to Ruby's original Kernel#require
  unless defined?(gem_original_require)
    # :stopdoc:
    alias_method :gem_original_require, :require
    private :gem_original_require
    # :startdoc:
  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) # :doc:
    return gem_original_require(path) unless Gem.discover_gems_on_require

RUBYGEMS_ACTIVATION_MONITOR.synchronize do
      path = File.path(path)

# If +path+ belongs to a default gem, we activate it and then go straight
      # to normal require

if spec = Gem.find_default_spec(path)
        name = spec.name

next if Gem.loaded_specs[name]

# Ensure -I beats a default gem
        resolved_path = begin
          rp = nil
          load_path_check_index = Gem.load_path_insert_index - Gem.activated_gem_paths
          Gem.suffixes.find do |s|
            $LOAD_PATH[0...load_path_check_index].find do |lp|
              if File.symlink? lp # for backward compatibility
                next
              end

full_path = File.expand_path(File.join(lp, "#{path}#{s}"))
              rp = full_path if File.file?(full_path)
            end
          end
          rp
        end

Kernel.send(:gem, name, Gem::Requirement.default_prerelease) unless
          resolved_path

next
      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?
        next
      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

if Gem::Specification.find_active_stub_by_path(path)
        next
      end

# 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?
        found_specs = Gem::Specification.find_in_unresolved_tree path

found_specs.each(&:activate)

# 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
          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.find {|s| !s.has_conflicts? }

unless valid
          le = Gem::LoadError.new "unable to find a version of '#{names.first}' to activate"
          le.name = names.first
          raise le
        end

valid.activate
      end
    end

begin
      gem_original_require(path)
    rescue LoadError => load_error
      if load_error.path == path &&
         RUBYGEMS_ACTIVATION_MONITOR.synchronize { Gem.try_activate(path) }

return gem_original_require(path)
      end

raise load_error
    end
  end

private :require
end

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