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Class: Gem::Requirement

Relationships & Source Files
Namespace Children
Exceptions:
Inherits: Object
Defined in: lib/rubygems/requirement.rb

Overview

A Requirement is a set of one or more version restrictions. It supports a few (=, !=, >, <, >=, <=, ~>) different restriction operators.

See Version for a description on how versions and requirements work together in RubyGems.

Constant Summary

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new(*requirements) ⇒ Requirement

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 ">= 0".

[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 131

def initialize(*requirements)
  requirements = requirements.flatten
  requirements.compact!
  requirements.uniq!

  if requirements.empty?
    @requirements = [DefaultRequirement]
  else
    @requirements = requirements.map! {|r| self.class.parse r }
  end
end

Class Method Details

.create(*inputs)

Factory method to create a 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.

[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 55

def self.create(*inputs)
  return new inputs if inputs.length > 1

  input = inputs.shift

  case input
  when Gem::Requirement then
    input
  when Gem::Version, Array then
    new input
  when "!" then
    source_set
  else
    if input.respond_to? :to_str
      new [input.to_str]
    else
      default
    end
  end
end

.default

[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 76

def self.default
  new ">= 0"
end

.default_prerelease

[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 80

def self.default_prerelease
  new ">= 0.a"
end

.parse(obj)

Parse obj, returning an [op, version] pair. obj can be a String or a Version.

If obj is a String, it can be either a full requirement specification, like ">= 1.2", or a simple version number, like "1.2".

parse("> 1.0")                 # => [">", Gem::Version.new("1.0")]
parse("1.0")                   # => ["=", Gem::Version.new("1.0")]
parse(Gem::Version.new("1.0")) # => ["=,  Gem::Version.new("1.0")]
[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 103

def self.parse(obj)
  return ["=", obj] if Gem::Version === obj

  unless PATTERN =~ obj.to_s
    raise BadRequirementError, "Illformed requirement [#{obj.inspect}]"
  end

  if $1 == ">=" && $2 == "0"
    DefaultRequirement
  elsif $1 == ">=" && $2 == "0.a"
    DefaultPrereleaseRequirement
  else
    [-($1 || "="), Gem::Version.new($2)]
  end
end

.source_set

This method is for internal use only.

A source set requirement, used for Gemfiles and lockfiles

[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 87

def self.source_set # :nodoc:
  SOURCE_SET_REQUIREMENT
end

Instance Attribute Details

#exact?Boolean (readonly)

true if the requirement is for only an exact version

[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 184

def exact?
  return false unless @requirements.size == 1
  @requirements[0][0] == "="
end

#none?Boolean (readonly)

true if this gem has no requirements.

[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 173

def none?
  if @requirements.size == 1
    @requirements[0] == DefaultRequirement
  else
    false
  end
end

#prerelease?Boolean (readonly)

A requirement is a prerelease if any of the versions inside of it are prereleases

[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 229

def prerelease?
  requirements.any? {|r| r.last.prerelease? }
end

#requirements (readonly)

This method is for internal use only.

An array of requirement pairs. The first element of the pair is the op, and the second is the Version.

[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 123

attr_reader :requirements #:nodoc:

#specific?Boolean (readonly)

True if the requirement will not always match the latest version.

[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 254

def specific?
  return true if @requirements.length > 1 # GIGO, > 1, > 2 is silly

  !%w[> >=].include? @requirements.first.first # grab the operator
end

Instance Method Details

#==(other)

This method is for internal use only.
[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 264

def ==(other) # :nodoc:
  return unless Gem::Requirement === other

  # An == check is always necessary
  return false unless _sorted_requirements == other._sorted_requirements

  # An == check is sufficient unless any requirements use ~>
  return true unless _tilde_requirements.any?

  # If any requirements use ~> we use the stricter `#eql?` that also checks
  # that version precision is the same
  _tilde_requirements.eql?(other._tilde_requirements)
end

#===(version)

Alias for #satisfied_by?.

[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 248

alias :=== :satisfied_by?

#=~(version)

Alias for #satisfied_by?.

[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 249

alias :=~ :satisfied_by?

#_sorted_requirements (protected)

[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 280

def _sorted_requirements
  @_sorted_requirements ||= requirements.sort_by(&:to_s)
end

#_tilde_requirements (protected)

[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 284

def _tilde_requirements
  @_tilde_requirements ||= _sorted_requirements.select {|r| r.first == "~>" }
end

#as_list

This method is for internal use only.
[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 189

def as_list # :nodoc:
  requirements.map {|op, version| "#{op} #{version}" }
end

#concat(new)

Concatenates the .new requirements onto this requirement.

[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 146

def concat(new)
  new = new.flatten
  new.compact!
  new.uniq!
  new = new.map {|r| self.class.parse r }

  @requirements.concat new
end

#encode_with(coder)

This method is for internal use only.
[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 221

def encode_with(coder) # :nodoc:
  coder.add "requirements", @requirements
end

#for_lockfile

This method is for internal use only.

Formats this requirement for use in a RequestSet::Lockfile.

[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 158

def for_lockfile # :nodoc:
  return if [DefaultRequirement] == @requirements

  list = requirements.sort_by do |_, version|
    version
  end.map do |op, version|
    "#{op} #{version}"
  end.uniq

  " (#{list.join ', '})"
end

#hash

This method is for internal use only.
[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 193

def hash # :nodoc:
  requirements.map {|r| r.first == "~>" ? [r[0], r[1].to_s] : r }.sort.hash
end

#init_with(coder)

This method is for internal use only.
[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 213

def init_with(coder) # :nodoc:
  yaml_initialize coder.tag, coder.map
end

#marshal_dump

This method is for internal use only.
[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 197

def marshal_dump # :nodoc:
  [@requirements]
end

#marshal_load(array)

This method is for internal use only.

Raises:

  • (TypeError)
[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 201

def marshal_load(array) # :nodoc:
  @requirements = array[0]

  raise TypeError, "wrong @requirements" unless Array === @requirements
end

#pretty_print(q)

This method is for internal use only.
[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 233

def pretty_print(q) # :nodoc:
  q.group 1, "Gem::Requirement.new(", ")" do
    q.pp as_list
  end
end

#satisfied_by?(version) ⇒ Boolean Also known as: #===, #=~

True if version satisfies this Requirement.

Raises:

  • (ArgumentError)
[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 242

def satisfied_by?(version)
  raise ArgumentError, "Need a Gem::Version: #{version.inspect}" unless
    Gem::Version === version
  requirements.all? {|op, rv| OPS[op].call version, rv }
end

#to_s

This method is for internal use only.
[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 260

def to_s # :nodoc:
  as_list.join ", "
end

#to_yaml_properties

This method is for internal use only.
[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 217

def to_yaml_properties # :nodoc:
  ["@requirements"]
end

#yaml_initialize(tag, vals)

This method is for internal use only.
[ GitHub ]

  
# File 'lib/rubygems/requirement.rb', line 207

def yaml_initialize(tag, vals) # :nodoc:
  vals.each do |ivar, val|
    instance_variable_set "@#{ivar}", val
  end
end