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Diffstat (limited to 'ruby_1_9_3/lib/rubygems/gem_path_searcher.rb')
| -rw-r--r-- | ruby_1_9_3/lib/rubygems/gem_path_searcher.rb | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/ruby_1_9_3/lib/rubygems/gem_path_searcher.rb b/ruby_1_9_3/lib/rubygems/gem_path_searcher.rb new file mode 100644 index 0000000000..814b5fb0e5 --- /dev/null +++ b/ruby_1_9_3/lib/rubygems/gem_path_searcher.rb @@ -0,0 +1,172 @@ +require "rubygems" +require "rubygems/deprecate" + +## +# GemPathSearcher has the capability to find loadable files inside +# gems. It generates data up front to speed up searches later. + +class Gem::GemPathSearcher + + ## + # Initialise the data we need to make searches later. + + def initialize + # We want a record of all the installed gemspecs, in the order we wish to + # examine them. + # TODO: remove this stupid method + @gemspecs = init_gemspecs + + # Map gem spec to glob of full require_path directories. Preparing this + # information may speed up searches later. + @lib_dirs = {} + + @gemspecs.each do |spec| + @lib_dirs[spec.object_id] = lib_dirs_for spec + end + end + + ## + # Look in all the installed gems until a matching +glob+ is found. + # Return the _gemspec_ of the gem where it was found. If no match + # is found, return nil. + # + # The gems are searched in alphabetical order, and in reverse + # version order. + # + # For example: + # + # find('log4r') # -> (log4r-1.1 spec) + # find('log4r.rb') # -> (log4r-1.1 spec) + # find('rake/rdoctask') # -> (rake-0.4.12 spec) + # find('foobarbaz') # -> nil + # + # Matching paths can have various suffixes ('.rb', '.so', and + # others), which may or may not already be attached to _file_. + # This method doesn't care about the full filename that matches; + # only that there is a match. + + def find(glob) + # HACK violation of encapsulation + @gemspecs.find do |spec| + # TODO: inverted responsibility + matching_file? spec, glob + end + end + + # Looks through the available gemspecs and finds the first + # one that contains +file+ as a requirable file. + + def find_spec_for_file(file) + @gemspecs.find do |spec| + return spec if spec.contains_requirable_file?(file) + end + end + + def find_active(glob) + # HACK violation of encapsulation + @gemspecs.find do |spec| + # TODO: inverted responsibility + spec.loaded? and matching_file? spec, glob + end + end + + ## + # Works like #find, but finds all gemspecs matching +glob+. + + def find_all(glob) + # HACK violation of encapsulation + @gemspecs.select do |spec| + # TODO: inverted responsibility + matching_file? spec, glob + end || [] + end + + def find_in_unresolved(glob) + # HACK violation + specs = Gem.unresolved_deps.values.map { |dep| + Gem.source_index.search dep, true + }.flatten + + specs.select do |spec| + # TODO: inverted responsibility + matching_file? spec, glob + end || [] + end + + def find_in_unresolved_tree glob + # HACK violation + # TODO: inverted responsibility + specs = Gem.unresolved_deps.values.map { |dep| + Gem.source_index.search dep, true + }.flatten + + specs.reverse_each do |spec| + trails = matching_paths(spec, glob) + next if trails.empty? + return trails.map(&:reverse).sort.first.reverse + end + + [] + end + + ## + # Attempts to find a matching path using the require_paths of the given + # +spec+. + + def matching_file?(spec, path) + not matching_files(spec, path).empty? + end + + def matching_paths(spec, path) + trails = [] + + spec.traverse do |from_spec, dep, to_spec, trail| + next unless to_spec.conflicts.empty? + trails << trail unless matching_files(to_spec, path).empty? + end + + trails + end + + ## + # Returns files matching +path+ in +spec+. + #-- + # Some of the intermediate results are cached in @lib_dirs for speed. + + def matching_files(spec, path) + return [] unless @lib_dirs[spec.object_id] # case no paths + glob = File.join @lib_dirs[spec.object_id], "#{path}#{Gem.suffix_pattern}" + Dir[glob].select { |f| File.file? f.untaint } + end + + ## + # Return a list of all installed gemspecs, sorted by alphabetical order and + # in reverse version order. (bar-2, bar-1, foo-2) + + def init_gemspecs + Gem::Specification.sort { |a, b| + names = a.name <=> b.name + next names if names.nonzero? + b.version <=> a.version + } + end + + ## + # Returns library directories glob for a gemspec. For example, + # '/usr/local/lib/ruby/gems/1.8/gems/foobar-1.0/{lib,ext}' + + def lib_dirs_for(spec) + "#{spec.full_gem_path}/{#{spec.require_paths.join(',')}}" if + spec.require_paths + end + + extend Gem::Deprecate + + deprecate :initialize, :none, 2011, 10 + deprecate :find, :none, 2011, 10 + deprecate :find_active, :none, 2011, 10 + deprecate :find_all, :none, 2011, 10 + deprecate :find_in_unresolved, :none, 2011, 10 + deprecate :find_in_unresolved_tree, :none, 2011, 10 + deprecate :find_spec_for_file, :none, 2011, 10 +end |