class Gem::Requirement

一个 Requirement 是一个或多个版本限制的集合。它支持一些（=, !=, >, <, >=, <=, ~>）不同的限制运算符。

有关 RubyGems 中版本和要求如何协同工作的描述，请参阅 Gem::Version。

Constants

DefaultPrereleaseRequirement: 默认要求匹配任何版本
DefaultRequirement: 默认要求匹配任何非预发布版本
PATTERN: 一个匹配要求的正则表达式

Public Class Methods

Source

# 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

创建 Gem::Requirement 对象的工厂方法。输入可以是 Version、String 或 nil。旨在简化客户端代码。

如果输入“奇怪”，则返回默认版本要求。

default ()

Source

# File lib/rubygems/requirement.rb, line 76
def self.default
  new ">= 0"
end

default_prerelease ()

Source

# File lib/rubygems/requirement.rb, line 80
def self.default_prerelease
  new ">= 0.a"
end

new (*requirements)

Source

# File lib/rubygems/requirement.rb, line 133
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

从 requirements 构建一个要求。要求可以是字符串、Gem::Versions 或它们的数组。nil 和重复的要求将被忽略。一组空的 requirements 与 ">= 0" 相同。

parse (obj)

Source

# 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
  op = -($1 || "=")
  version = -$2

  if op == ">=" && version == "0"
    DefaultRequirement
  elsif op == ">=" && version == "0.a"
    DefaultPrereleaseRequirement
  else
    [op, Gem::Version.new(version)]
  end
end

解析 obj，返回一个 [op, version] 对。obj 可以是 String 或 Gem::Version。

如果 obj 是 String，它可以是完整的要求规范，如 ">= 1.2"，或简单的版本号，如 "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")]

Public Instance Methods

=== (version)

别名： satisfied_by?

=~ (version)

别名： satisfied_by?

concat (new)

Source

# File lib/rubygems/requirement.rb, line 148
def concat(new)
  new = new.flatten
  new.compact!
  new.uniq!
  new = new.map {|r| self.class.parse r }

  @requirements.concat new
end

将 new 要求连接到此要求。

exact? ()

Source

# File lib/rubygems/requirement.rb, line 186
def exact?
  return false unless @requirements.size == 1
  @requirements[0][0] == "="
end

如果要求仅用于精确版本，则为 true

none? ()

Source

# File lib/rubygems/requirement.rb, line 175
def none?
  if @requirements.size == 1
    @requirements[0] == DefaultRequirement
  else
    false
  end
end

如果此 gem 没有要求，则为 true。

prerelease? ()

Source

# File lib/rubygems/requirement.rb, line 228
def prerelease?
  requirements.any? {|r| r.last.prerelease? }
end

如果要求中的任何版本是预发布版本，则该要求是预发布的

satisfied_by? (version)

Source

# File lib/rubygems/requirement.rb, line 241
def satisfied_by?(version)
  raise ArgumentError, "Need a Gem::Version: #{version.inspect}" unless
    Gem::Version === version
  requirements.all? {|op, rv| OPS.fetch(op).call version, rv }
end

如果 version 满足此 Requirement，则为 true。

也别名为： ===, =~

specific? ()

Source

# File lib/rubygems/requirement.rb, line 253
def specific?
  return true if @requirements.length > 1 # GIGO, > 1, > 2 is silly

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

如果要求不总是匹配最新版本，则为 true。

Protected Instance Methods

_sorted_requirements ()

Source

# File lib/rubygems/requirement.rb, line 279
def _sorted_requirements
  @_sorted_requirements ||= requirements.sort_by(&:to_s)
end

_tilde_requirements ()

Source

# File lib/rubygems/requirement.rb, line 283
def _tilde_requirements
  @_tilde_requirements ||= _sorted_requirements.select {|r| r.first == "~>" }
end