NAME

       Dpkg::Deps::Simple - represents a single dependency statement

DESCRIPTION

       This class represents a single dependency statement.  It has several interesting
       properties:

       package
           The package name (can be undef if the dependency has not been initialized or if the
           simplification of the dependency lead to its removal).

       relation
           The relational operator: "=", "<<", "<=", ">=" or ">>". It can be undefined if the
           dependency had no version restriction. In that case the following field is also
           undefined.

       version
           The version.

       arches
           The list of architectures where this dependency is applicable. It is undefined when
           there's no restriction, otherwise it is an array ref. It can contain an exclusion
           list, in that case each architecture is prefixed with an exclamation mark.

       archqual
           The arch qualifier of the dependency (can be undef if there is none).  In the
           dependency "python:any (>= 2.6)", the arch qualifier is "any".

       restrictions
           The restrictions formula for this dependency. It is undefined when there is no
           restriction formula. Otherwise it is an array ref.

METHODS

       $dep = Dpkg::Deps::Simple->new([$dep[, %opts]]);
           Creates a new object. Some options can be set through %opts:

           host_arch
               Sets the host architecture.

           build_arch
               Sets the build architecture.

           build_dep
               Specifies whether the parser should consider it a build dependency.  Defaults to
               0.

           tests_dep
               Specifies whether the parser should consider it a tests dependency.  Defaults to
               0.

       $dep->reset()
           Clears any dependency information stored in $dep so that $dep->is_empty() returns
           true.

       $dep->parse_string($dep_string)
           Parses the dependency string and modifies internal properties to match the parsed
           dependency.

       $dep->parse($fh, $desc)
           Parse a dependency line from a filehandle.

       $dep->load($filename)
           Parse a dependency line from $filename.

       $dep->output([$fh])
       "$dep"
           Returns a string representing the dependency. If $fh is set, it prints the string to
           the filehandle.

       $dep->save($filename)
           Save the dependency into the given $filename.

       $dep->implies($other_dep)
           Returns 1 when $dep implies $other_dep. Returns 0 when $dep implies NOT($other_dep).
           Returns undef when there is no implication. $dep and $other_dep do not need to be of
           the same type.

       $dep->get_deps()
           Returns a list of sub-dependencies, which for this object it means it returns itself.

       $dep->sort()
           This method is a no-op for this object.

       $dep->arch_is_concerned($arch)
           Returns true if the dependency applies to the indicated architecture.

       $dep->reduce_arch($arch)
           Simplifies the dependency to contain only information relevant to the given
           architecture. This object can be left empty after this operation. This trims off the
           architecture restriction list of these objects.

       $dep->has_arch_restriction()
           Returns the package name if the dependency applies only to a subset of architectures.

       $dep->profile_is_concerned()
           Returns true if the dependency applies to the indicated profile.

       $dep->reduce_profiles()
           Simplifies the dependency to contain only information relevant to the given profile.
           This object can be left empty after this operation. This trims off the profile
           restriction list of this object.

       $dep->get_evaluation($facts)
           Evaluates the dependency given a list of installed packages and a list of virtual
           packages provided. These lists are part of the Dpkg::Deps::KnownFacts object given as
           parameters.

           Returns 1 when it's true, 0 when it's false, undef when some information is lacking to
           conclude.

       $dep->simplify_deps($facts, @assumed_deps)
           Simplifies the dependency as much as possible given the list of facts (see class
           Dpkg::Deps::KnownFacts) and a list of other dependencies that are known to be true.

       $dep->is_empty()
           Returns true if the dependency is empty and doesn't contain any useful information.
           This is true when the object has not yet been initialized.

       $dep->merge_union($other_dep)
           Returns true if $dep could be modified to represent the union of both dependencies.
           Otherwise returns false.

CHANGES

   Version 1.02 (dpkg 1.17.10)
       New methods: Add $dep->profile_is_concerned() and $dep->reduce_profiles().

   Version 1.01 (dpkg 1.16.1)
       New method: Add $dep->reset().

       New property: recognizes the arch qualifier "any" and stores it in the "archqual" property
       when present.

   Version 1.00 (dpkg 1.15.6)
       Mark the module as public.