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Diffstat (limited to 'ruby_1_9_3/lib/rubygems/requirement.rb')
| -rw-r--r-- | ruby_1_9_3/lib/rubygems/requirement.rb | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/ruby_1_9_3/lib/rubygems/requirement.rb b/ruby_1_9_3/lib/rubygems/requirement.rb new file mode 100644 index 0000000000..7abff01c39 --- /dev/null +++ b/ruby_1_9_3/lib/rubygems/requirement.rb @@ -0,0 +1,204 @@ +require "rubygems/version" + +## +# A Requirement is a set of one or more version restrictions. It supports a +# few (<tt>=, !=, >, <, >=, <=, ~></tt>) different restriction operators. + +# REFACTOR: The fact that a requirement is singular or plural is kind of +# awkward. Is Requirement the right name for this? Or should it be one +# [op, number] pair, and we call the list of requirements something else? +# Since a Requirement is held by a Dependency, maybe this should be made +# singular and the list aspect should be pulled up into Dependency? + +require "rubygems/version" +require "rubygems/deprecate" + +class Gem::Requirement + include Comparable + + OPS = { #:nodoc: + "=" => lambda { |v, r| v == r }, + "!=" => lambda { |v, r| v != r }, + ">" => lambda { |v, r| v > r }, + "<" => lambda { |v, r| v < r }, + ">=" => lambda { |v, r| v >= r }, + "<=" => lambda { |v, r| v <= r }, + "~>" => lambda { |v, r| v >= r && v.release < r.bump } + } + + quoted = OPS.keys.map { |k| Regexp.quote k }.join "|" + PATTERN = /\A\s*(#{quoted})?\s*(#{Gem::Version::VERSION_PATTERN})\s*\z/ + + ## + # Factory method to create a Gem::Requirement object. Input may be + # a Version, a String, or nil. Intended to simplify client code. + # + # If the input is "weird", the default version requirement is + # returned. + + def self.create input + case input + when Gem::Requirement then + input + when Gem::Version, Array then + new input + else + if input.respond_to? :to_str then + new [input.to_str] + else + default + end + end + end + + ## + # A default "version requirement" can surely _only_ be '>= 0'. + #-- + # This comment once said: + # + # "A default "version requirement" can surely _only_ be '> 0'." + + def self.default + new '>= 0' + end + + ## + # Parse +obj+, returning an <tt>[op, version]</tt> pair. +obj+ can + # be a String or a Gem::Version. + # + # If +obj+ is a String, it can be either a full requirement + # specification, like <tt>">= 1.2"</tt>, or a simple version number, + # like <tt>"1.2"</tt>. + # + # parse("> 1.0") # => [">", "1.0"] + # parse("1.0") # => ["=", "1.0"] + # parse(Gem::Version.new("1.0")) # => ["=, "1.0"] + + def self.parse obj + return ["=", obj] if Gem::Version === obj + + unless PATTERN =~ obj.to_s + raise ArgumentError, "Illformed requirement [#{obj.inspect}]" + end + + [$1 || "=", Gem::Version.new($2)] + end + + ## + # An array of requirement pairs. The first element of the pair is + # the op, and the second is the Gem::Version. + + attr_reader :requirements #:nodoc: + + ## + # Constructs a requirement from +requirements+. Requirements can be + # Strings, Gem::Versions, or Arrays of those. +nil+ and duplicate + # requirements are ignored. An empty set of +requirements+ is the + # same as <tt>">= 0"</tt>. + + def initialize *requirements + requirements = requirements.flatten + requirements.compact! + requirements.uniq! + + requirements << ">= 0" if requirements.empty? + @none = (requirements == ">= 0") + @requirements = requirements.map! { |r| self.class.parse r } + end + + def none? + @none ||= (to_s == ">= 0") + end + + def as_list # :nodoc: + requirements.map { |op, version| "#{op} #{version}" }.sort + end + + def hash # :nodoc: + requirements.hash + end + + def marshal_dump # :nodoc: + fix_syck_default_key_in_requirements + + [@requirements] + end + + def marshal_load array # :nodoc: + @requirements = array[0] + + fix_syck_default_key_in_requirements + end + + def yaml_initialize(tag, vals) # :nodoc: + vals.each do |ivar, val| + instance_variable_set "@#{ivar}", val + end + + fix_syck_default_key_in_requirements + end + + def init_with coder # :nodoc: + yaml_initialize coder.tag, coder.map + end + + def prerelease? + requirements.any? { |r| r.last.prerelease? } + end + + def pretty_print q # :nodoc: + q.group 1, 'Gem::Requirement.new(', ')' do + q.pp as_list + end + end + + ## + # True if +version+ satisfies this Requirement. + + def satisfied_by? version + # #28965: syck has a bug with unquoted '=' YAML.loading as YAML::DefaultKey + requirements.all? { |op, rv| (OPS[op] || OPS["="]).call version, rv } + end + + alias :=== :satisfied_by? + alias :=~ :satisfied_by? + + ## + # True if the requirement will not always match the latest version. + + def specific? + return true if @requirements.length > 1 # GIGO, > 1, > 2 is silly + + not %w[> >=].include? @requirements.first.first # grab the operator + end + + def to_s # :nodoc: + as_list.join ", " + end + + def <=> other # :nodoc: + to_s <=> other.to_s + end + + private + + def fix_syck_default_key_in_requirements + Gem.load_yaml + + # Fixup the Syck DefaultKey bug + @requirements.each do |r| + if r[0].kind_of? Gem::SyckDefaultKey + r[0] = "=" + end + end + end +end + +# :stopdoc: +# Gem::Version::Requirement is used in a lot of old YAML specs. It's aliased +# here for backwards compatibility. I'd like to remove this, maybe in RubyGems +# 2.0. + +::Gem::Version::Requirement = ::Gem::Requirement +# :startdoc: + |