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* test/rubygems*: ditto. * common.mk (prelude): Updated for RubyGems 2.0 source rearrangement. * tool/change_maker.rb: Allow invalid UTF-8 characters in source files. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37976 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
119 lines
3.4 KiB
Ruby
Executable file
119 lines
3.4 KiB
Ruby
Executable file
#--
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# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
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# All rights reserved.
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# See LICENSE.txt for permissions.
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#++
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module Kernel
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if defined?(gem_original_require) then
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# Ruby ships with a custom_require, override its require
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remove_method :require
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else
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##
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# The Kernel#require from before RubyGems was loaded.
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alias gem_original_require require
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private :gem_original_require
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end
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##
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# When RubyGems is required, Kernel#require is replaced with our own which
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# is capable of loading gems on demand.
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#
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# When you call <tt>require 'x'</tt>, this is what happens:
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# * If the file can be loaded from the existing Ruby loadpath, it
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# is.
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# * Otherwise, installed gems are searched for a file that matches.
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# If it's found in gem 'y', that gem is activated (added to the
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# loadpath).
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#
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# The normal <tt>require</tt> functionality of returning false if
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# that file has already been loaded is preserved.
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def require path
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spec = Gem.find_unresolved_default_spec(path)
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if spec
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Gem.remove_unresolved_default_spec(spec)
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gem(spec.name)
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end
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# If there are no unresolved deps, then we can use just try
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# normal require handle loading a gem from the rescue below.
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if Gem::Specification.unresolved_deps.empty? then
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return gem_original_require(path)
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end
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# If +path+ is for a gem that has already been loaded, don't
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# bother trying to find it in an unresolved gem, just go straight
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# to normal require.
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#--
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# TODO request access to the C implementation of this to speed up RubyGems
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spec = Gem::Specification.find { |s|
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s.activated? and s.contains_requirable_file? path
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}
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return gem_original_require(path) if spec
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# Attempt to find +path+ in any unresolved gems...
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found_specs = Gem::Specification.find_in_unresolved path
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# If there are no directly unresolved gems, then try and find +path+
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# in any gems that are available via the currently unresolved gems.
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# For example, given:
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#
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# a => b => c => d
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#
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# If a and b are currently active with c being unresolved and d.rb is
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# requested, then find_in_unresolved_tree will find d.rb in d because
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# it's a dependency of c.
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#
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if found_specs.empty? then
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found_specs = Gem::Specification.find_in_unresolved_tree path
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found_specs.each do |found_spec|
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found_spec.activate
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end
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# We found +path+ directly in an unresolved gem. Now we figure out, of
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# the possible found specs, which one we should activate.
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else
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# Check that all the found specs are just different
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# versions of the same gem
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names = found_specs.map(&:name).uniq
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if names.size > 1 then
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raise Gem::LoadError, "#{path} found in multiple gems: #{names.join ', '}"
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end
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# Ok, now find a gem that has no conflicts, starting
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# at the highest version.
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valid = found_specs.select { |s| s.conflicts.empty? }.last
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unless valid then
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le = Gem::LoadError.new "unable to find a version of '#{names.first}' to activate"
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le.name = names.first
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raise le
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end
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valid.activate
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end
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gem_original_require path
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rescue LoadError => load_error
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if load_error.message.start_with?("Could not find") or
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(load_error.message.end_with?(path) and Gem.try_activate(path)) then
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return gem_original_require(path)
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end
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raise load_error
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end
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private :require
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end
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