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# frozen_string_literal: true
require_relative "remote_fetcher"
require_relative "user_interaction"
require_relative "errors"
require_relative "text"
require_relative "name_tuple"
##
# SpecFetcher handles metadata updates from remote gem repositories.
class Gem::SpecFetcher
include Gem::UserInteraction
include Gem::Text
##
# Cache of latest specs
attr_reader :latest_specs # :nodoc:
##
# Sources for this SpecFetcher
attr_reader :sources # :nodoc:
##
# Cache of all released specs
attr_reader :specs # :nodoc:
##
# Cache of prerelease specs
attr_reader :prerelease_specs # :nodoc:
@fetcher = nil
##
# Default fetcher instance. Use this instead of ::new to reduce object
# allocation.
def self.fetcher
@fetcher ||= new
end
def self.fetcher=(fetcher) # :nodoc:
@fetcher = fetcher
end
##
# Creates a new SpecFetcher. Ordinarily you want to use the default fetcher
# from Gem::SpecFetcher::fetcher which uses the Gem.sources.
#
# If you need to retrieve specifications from a different +source+, you can
# send it as an argument.
def initialize(sources = nil)
@sources = sources || Gem.sources
@update_cache =
begin
File.stat(Gem.user_home).uid == Process.uid
rescue Errno::EACCES, Errno::ENOENT
false
end
@specs = {}
@latest_specs = {}
@prerelease_specs = {}
@caches = {
latest: @latest_specs,
prerelease: @prerelease_specs,
released: @specs,
}
@fetcher = Gem::RemoteFetcher.fetcher
end
##
#
# Find and fetch gem name tuples that match +dependency+.
#
# If +matching_platform+ is false, gems for all platforms are returned.
def search_for_dependency(dependency, matching_platform=true)
found = {}
rejected_specs = {}
list, errors = available_specs(dependency.identity)
list.each do |source, specs|
if dependency.name.is_a?(String) && specs.respond_to?(:bsearch)
start_index = (0...specs.length).bsearch {|i| specs[i].name >= dependency.name }
end_index = (0...specs.length).bsearch {|i| specs[i].name > dependency.name }
specs = specs[start_index...end_index] if start_index && end_index
end
found[source] = specs.select do |tup|
if dependency.match?(tup)
if matching_platform && !Gem::Platform.match_gem?(tup.platform, tup.name)
pm = (
rejected_specs[dependency] ||= \
Gem::PlatformMismatch.new(tup.name, tup.version))
pm.add_platform tup.platform
false
else
true
end
end
end
end
errors += rejected_specs.values
tuples = []
found.each do |source, specs|
specs.each do |s|
tuples << [s, source]
end
end
tuples = tuples.sort_by {|x| x[0].version }
[tuples, errors]
end
##
# Return all gem name tuples who's names match +obj+
def detect(type=:complete)
tuples = []
list, _ = available_specs(type)
list.each do |source, specs|
specs.each do |tup|
if yield(tup)
tuples << [tup, source]
end
end
end
tuples
end
##
# Find and fetch specs that match +dependency+.
#
# If +matching_platform+ is false, gems for all platforms are returned.
def spec_for_dependency(dependency, matching_platform=true)
tuples, errors = search_for_dependency(dependency, matching_platform)
specs = []
tuples.each do |tup, source|
spec = source.fetch_spec(tup)
rescue Gem::RemoteFetcher::FetchError => e
errors << Gem::SourceFetchProblem.new(source, e)
else
specs << [spec, source]
end
[specs, errors]
end
##
# Suggests gems based on the supplied +gem_name+. Returns an array of
# alternative gem names.
def suggest_gems_from_name(gem_name, type = :latest, num_results = 5)
gem_name = gem_name.downcase.tr("_-", "")
# All results for 3-character-or-shorter (minus hyphens/underscores) gem
# names get rejected, so we just return an empty array immediately instead.
return [] if gem_name.length <= 3
max = gem_name.size / 2
names = available_specs(type).first.values.flatten(1)
min_length = gem_name.length - max
max_length = gem_name.length + max
gem_name_with_postfix = "#{gem_name}ruby"
gem_name_with_prefix = "ruby#{gem_name}"
matches = names.filter_map do |n|
len = n.name.length
# If the gem doesn't support the current platform, bail early.
next unless n.match_platform?
# If the length is min_length or shorter, we've done `max` deletions.
# This would be rejected later, so we skip it for performance.
next if len <= min_length
# The candidate name, normalized the same as gem_name.
normalized_name = n.name.downcase
normalized_name.tr!("_-", "")
# If the gem is "{NAME}-ruby" and "ruby-{NAME}", we want to return it.
# But we already removed hyphens, so we check "{NAME}ruby" and "ruby{NAME}".
next [n.name, 0] if normalized_name == gem_name_with_postfix
next [n.name, 0] if normalized_name == gem_name_with_prefix
# If the length is max_length or longer, we've done `max` insertions.
# This would be rejected later, so we skip it for performance.
next if len >= max_length
# If we found an exact match (after stripping underscores and hyphens),
# that's our most likely candidate.
# Return it immediately, and skip the rest of the loop.
return [n.name] if normalized_name == gem_name
distance = levenshtein_distance gem_name, normalized_name
# Skip current candidate, if the edit distance is greater than allowed.
next if distance >= max
# If all else fails, return the name and the calculated distance.
[n.name, distance]
end
matches = if matches.empty? && type != :prerelease
suggest_gems_from_name gem_name, :prerelease
else
matches.uniq.sort_by {|_name, dist| dist }
end
matches.map {|name, _dist| name }.uniq.first(num_results)
end
##
# Returns a list of gems available for each source in Gem::sources.
#
# +type+ can be one of 3 values:
# :released => Return the list of all released specs
# :complete => Return the list of all specs
# :latest => Return the list of only the highest version of each gem
# :prerelease => Return the list of all prerelease only specs
#
def available_specs(type)
errors = []
list = {}
@sources.each_source do |source|
names = case type
when :latest
tuples_for source, :latest
when :released
tuples_for source, :released
when :complete
names =
tuples_for(source, :prerelease, true) +
tuples_for(source, :released)
names.sort
when :abs_latest
names =
tuples_for(source, :prerelease, true) +
tuples_for(source, :latest)
names.sort
when :prerelease
tuples_for(source, :prerelease)
else
raise Gem::Exception, "Unknown type - :#{type}"
end
rescue Gem::RemoteFetcher::FetchError => e
errors << Gem::SourceFetchProblem.new(source, e)
else
list[source] = names
end
[list, errors]
end
##
# Retrieves NameTuples from +source+ of the given +type+ (:prerelease,
# etc.). If +gracefully_ignore+ is true, errors are ignored.
def tuples_for(source, type, gracefully_ignore=false) # :nodoc:
@caches[type][source.uri] ||=
source.load_specs(type).sort_by(&:name)
rescue Gem::RemoteFetcher::FetchError
raise unless gracefully_ignore
[]
end
end