1Version::Requirements(3U)ser Contributed Perl DocumentatiVoenrsion::Requirements(3)
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6 Version::Requirements - a set of version requirements for a CPAN dist
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9 version 0.101020
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12 use Version::Requirements;
13 my $build_requires = Version::Requirements->new;
15 $build_requires->add_minimum('Library::Foo' => 1.208);
17 $build_requires->add_minimum('Library::Foo' => 2.602);
19 $build_requires->add_minimum('Module::Bar' => 'v1.2.3');
21 $METAyml->{build_requires} = $build_requires->as_string_hash;
23
25 A Version::Requirements object models a set of version constraints like
26 those specified in the META.yml or META.json files in CPAN
27 distributions. It can be built up by adding more and more constraints,
28 and it will reduce them to the simplest representation.
29 Logically impossible constraints will be identified immediately by
31 thrown exceptions.
32
34 new
35 my $req = Version::Requirements->new;
36 This returns a new Version::Requirements object. It ignores any
38 arguments given.
39 add_minimum
41 $req->add_minimum( $module => $version );
42 This adds a new minimum version requirement. If the new requirement is
44 redundant to the existing specification, this has no effect.
45 Minimum requirements are inclusive. $version is required, along with
47 any greater version number.
48 This method returns the requirements object.
50 add_maximum
52 $req->add_maximum( $module => $version );
53 This adds a new maximum version requirement. If the new requirement is
55 redundant to the existing specification, this has no effect.
56 Maximum requirements are inclusive. No version strictly greater than
58 the given version is allowed.
59 This method returns the requirements object.
61 add_exclusion
63 $req->add_exclusion( $module => $version );
64 This adds a new excluded version. For example, you might use these
66 three method calls:
67 $req->add_minimum( $module => '1.00' );
69 $req->add_maximum( $module => '1.82' );
70 $req->add_exclusion( $module => '1.75' );
72 Any version between 1.00 and 1.82 inclusive would be acceptable, except
74 for 1.75.
75 This method returns the requirements object.
77 exact_version
79 $req->exact_version( $module => $version );
80 This sets the version required for the given module to exactly the
82 given version. No other version would be considered acceptable.
83 This method returns the requirements object.
85 add_requirements
87 $req->add_requirements( $another_req_object );
88 This method adds all the requirements in the given
90 Version::Requirements object to the requirements object on which it was
91 called. If there are any conflicts, an exception is thrown.
92 This method returns the requirements object.
94 accepts_module
96 my $bool = $req->accepts_modules($module => $version);
97 Given an module and version, this method returns true if the version
99 specification for the module accepts the provided version. In other
100 words, given:
101 Module => '>= 1.00, < 2.00'
103 We will accept 1.00 and 1.75 but not 0.50 or 2.00.
105 For modules that do not appear in the requirements, this method will
107 return true.
108 clear_requirement
110 $req->clear_requirement( $module );
111 This removes the requirement for a given module from the object.
113 This method returns the requirements object.
115 required_modules
117 This method returns a list of all the modules for which requirements
118 have been specified.
119 clone
121 $req->clone;
122 This method returns a clone of the invocant. The clone and the
124 original object can then be changed independent of one another.
125 is_simple
127 This method returns true if and only if all requirements are inclusive
128 minimums -- that is, if their string expression is just the version
129 number.
130 is_finalized
132 This method returns true if the requirements have been finalized by
133 having the "finalize" method called on them.
134 finalize
136 This method marks the requirements finalized. Subsequent attempts to
137 change the requirements will be fatal, if they would result in a
138 change. If they would not alter the requirements, they have no effect.
139 If a finalized set of requirements is cloned, the cloned requirements
141 are not also finalized.
142 as_string_hash
144 This returns a reference to a hash describing the requirements using
145 the strings in the META.yml specification.
146 For example after the following program:
148 my $req = Version::Requirements->new;
150 $req->add_minimum('Version::Requirements' => 0.102);
152 $req->add_minimum('Library::Foo' => 1.208);
154 $req->add_maximum('Library::Foo' => 2.602);
156 $req->add_minimum('Module::Bar' => 'v1.2.3');
158 $req->add_exclusion('Module::Bar' => 'v1.2.8');
160 $req->exact_version('Xyzzy' => '6.01');
162 my $hashref = $req->as_string_hash;
164 $hashref would contain:
166 {
168 'Version::Requirements' => '0.102',
169 'Library::Foo' => '>= 1.208, <= 2.206',
170 'Module::Bar' => '>= v1.2.3, != v1.2.8',
171 'Xyzzy' => '== 6.01',
172 }
173 from_string_hash
175 my $req = Version::Requirements->from_string_hash( \%hash );
176 This is an alternate constructor for a Version::Requirements object.
178 It takes a hash of module names and version requirement strings and
179 returns a new Version::Requirements object.
180
182 Ricardo Signes <rjbs@cpan.org>
183
185 This software is copyright (c) 2010 by Ricardo Signes.
186 This is free software; you can redistribute it and/or modify it under
188 the same terms as the Perl 5 programming language system itself.
189perl v5.12.0 2010-04-12 Version::Requirements(3)