summaryrefslogtreecommitdiff
path: root/jni/ruby/lib/rubygems/dependency.rb
blob: 5924d2fc6b92cefb696eff18a33e75b4f56befdd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
##
# The Dependency class holds a Gem name and a Gem::Requirement.

require "rubygems/requirement"

class Gem::Dependency

  ##
  # Valid dependency types.
  #--
  # When this list is updated, be sure to change
  # Gem::Specification::CURRENT_SPECIFICATION_VERSION as well.
  #
  # REFACTOR: This type of constant, TYPES, indicates we might want
  # two classes, used via inheritance or duck typing.

  TYPES = [
    :development,
    :runtime,
  ]

  ##
  # Dependency name or regular expression.

  attr_accessor :name

  ##
  # Allows you to force this dependency to be a prerelease.

  attr_writer :prerelease

  ##
  # Constructs a dependency with +name+ and +requirements+. The last
  # argument can optionally be the dependency type, which defaults to
  # <tt>:runtime</tt>.

  def initialize name, *requirements
    case name
    when String then # ok
    when Regexp then
      msg = ["NOTE: Dependency.new w/ a regexp is deprecated.",
             "Dependency.new called from #{Gem.location_of_caller.join(":")}"]
      warn msg.join("\n") unless Gem::Deprecate.skip
    else
      raise ArgumentError,
            "dependency name must be a String, was #{name.inspect}"
    end

    type         = Symbol === requirements.last ? requirements.pop : :runtime
    requirements = requirements.first if 1 == requirements.length # unpack

    unless TYPES.include? type
      raise ArgumentError, "Valid types are #{TYPES.inspect}, " +
                           "not #{type.inspect}"
    end

    @name        = name
    @requirement = Gem::Requirement.create requirements
    @type        = type
    @prerelease  = false

    # This is for Marshal backwards compatibility. See the comments in
    # +requirement+ for the dirty details.

    @version_requirements = @requirement
  end

  ##
  # A dependency's hash is the XOR of the hashes of +name+, +type+,
  # and +requirement+.

  def hash # :nodoc:
    name.hash ^ type.hash ^ requirement.hash
  end

  def inspect # :nodoc:
    if prerelease? then
      "<%s type=%p name=%p requirements=%p prerelease=ok>" %
        [self.class, self.type, self.name, requirement.to_s]
    else
      "<%s type=%p name=%p requirements=%p>" %
        [self.class, self.type, self.name, requirement.to_s]
    end
  end

  ##
  # Does this dependency require a prerelease?

  def prerelease?
    @prerelease || requirement.prerelease?
  end

  ##
  # Is this dependency simply asking for the latest version
  # of a gem?

  def latest_version?
    @requirement.none?
  end

  def pretty_print q # :nodoc:
    q.group 1, 'Gem::Dependency.new(', ')' do
      q.pp name
      q.text ','
      q.breakable

      q.pp requirement

      q.text ','
      q.breakable

      q.pp type
    end
  end

  ##
  # What does this dependency require?

  def requirement
    return @requirement if defined?(@requirement) and @requirement

    # @version_requirements and @version_requirement are legacy ivar
    # names, and supported here because older gems need to keep
    # working and Dependency doesn't implement marshal_dump and
    # marshal_load. In a happier world, this would be an
    # attr_accessor. The horrifying instance_variable_get you see
    # below is also the legacy of some old restructurings.
    #
    # Note also that because of backwards compatibility (loading new
    # gems in an old RubyGems installation), we can't add explicit
    # marshaling to this class until we want to make a big
    # break. Maybe 2.0.
    #
    # Children, define explicit marshal and unmarshal behavior for
    # public classes. Marshal formats are part of your public API.

    # REFACTOR: See above

    if defined?(@version_requirement) && @version_requirement
      version = @version_requirement.instance_variable_get :@version
      @version_requirement  = nil
      @version_requirements = Gem::Requirement.new version
    end

    @requirement = @version_requirements if defined?(@version_requirements)
  end

  def requirements_list
    requirement.as_list
  end

  def to_s # :nodoc:
    if type != :runtime then
      "#{name} (#{requirement}, #{type})"
    else
      "#{name} (#{requirement})"
    end
  end

  ##
  # Dependency type.

  def type
    @type ||= :runtime
  end

  def == other # :nodoc:
    Gem::Dependency === other &&
      self.name        == other.name &&
      self.type        == other.type &&
      self.requirement == other.requirement
  end

  ##
  # Dependencies are ordered by name.

  def <=> other
    self.name <=> other.name
  end

  ##
  # Uses this dependency as a pattern to compare to +other+. This
  # dependency will match if the name matches the other's name, and
  # other has only an equal version requirement that satisfies this
  # dependency.

  def =~ other
    unless Gem::Dependency === other
      return unless other.respond_to?(:name) && other.respond_to?(:version)
      other = Gem::Dependency.new other.name, other.version
    end

    return false unless name === other.name

    reqs = other.requirement.requirements

    return false unless reqs.length == 1
    return false unless reqs.first.first == '='

    version = reqs.first.last

    requirement.satisfied_by? version
  end

  alias === =~

  ##
  # :call-seq:
  #   dep.match? name          => true or false
  #   dep.match? name, version => true or false
  #   dep.match? spec          => true or false
  #
  # Does this dependency match the specification described by +name+ and
  # +version+ or match +spec+?
  #
  # NOTE:  Unlike #matches_spec? this method does not return true when the
  # version is a prerelease version unless this is a prerelease dependency.

  def match? obj, version=nil, allow_prerelease=false
    if !version
      name = obj.name
      version = obj.version
    else
      name = obj
    end

    return false unless self.name === name

    version = Gem::Version.new version

    return true if requirement.none? and not version.prerelease?
    return false if version.prerelease? and
                    not allow_prerelease and
                    not prerelease?

    requirement.satisfied_by? version
  end

  ##
  # Does this dependency match +spec+?
  #
  # NOTE:  This is not a convenience method.  Unlike #match? this method
  # returns true when +spec+ is a prerelease version even if this dependency
  # is not a prerelease dependency.

  def matches_spec? spec
    return false unless name === spec.name
    return true  if requirement.none?

    requirement.satisfied_by?(spec.version)
  end

  ##
  # Merges the requirements of +other+ into this dependency

  def merge other
    unless name == other.name then
      raise ArgumentError,
            "#{self} and #{other} have different names"
    end

    default = Gem::Requirement.default
    self_req  = self.requirement
    other_req = other.requirement

    return self.class.new name, self_req  if other_req == default
    return self.class.new name, other_req if self_req  == default

    self.class.new name, self_req.as_list.concat(other_req.as_list)
  end

  def matching_specs platform_only = false
    matches = Gem::Specification.stubs.find_all { |spec|
      self.name === spec.name and # TODO: == instead of ===
        requirement.satisfied_by? spec.version
    }.map(&:to_spec)

    if platform_only
      matches.reject! { |spec|
        not Gem::Platform.match spec.platform
      }
    end

    matches.sort_by { |s| s.sort_obj } # HACK: shouldn't be needed
  end

  ##
  # True if the dependency will not always match the latest version.

  def specific?
    @requirement.specific?
  end

  def to_specs
    matches = matching_specs true

    # TODO: check Gem.activated_spec[self.name] in case matches falls outside

    if matches.empty? then
      specs = Gem::Specification.find_all { |s|
                s.name == name
              }.map { |x| x.full_name }

      if specs.empty?
        total = Gem::Specification.to_a.size
        msg   = "Could not find '#{name}' (#{requirement}) among #{total} total gem(s)\n"
      else
        msg   = "Could not find '#{name}' (#{requirement}) - did find: [#{specs.join ','}]\n"
      end
      msg << "Checked in 'GEM_PATH=#{Gem.path.join(File::PATH_SEPARATOR)}', execute `gem env` for more information"

      error = Gem::LoadError.new(msg)
      error.name        = self.name
      error.requirement = self.requirement
      raise error
    end

    # TODO: any other resolver validations should go here

    matches
  end

  def to_spec
    matches = self.to_specs

    active = matches.find { |spec| spec.activated? }

    return active if active

    matches.delete_if { |spec| spec.version.prerelease? } unless prerelease?

    matches.last
  end
end