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=head1 NAME

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

=head1 DESCRIPTION

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

=over 4

=item 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).

=item 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.

=item version

The version.

=item 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.

=item 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".

=item restrictions

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

=back

=cut

=head1 METHODS

=over 4

=item $dep = Dpkg::Deps::Simple->new([$dep[, %opts]]);

Creates a new object. Some options can be set through %opts:

=over

=item host_arch

Sets the host architecture.

=item build_arch

Sets the build architecture.

=item build_dep

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

=item tests_dep

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

This option implicitly (and forcibly) enables C<build_dep> because test
dependencies are based on build dependencies (since dpkg 1.22.1).

=back

=cut

=item $dep->reset()

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

=cut

=item $dep->parse_string($dep_string)

Parses the dependency string and modifies internal properties to match the
parsed dependency.

=cut

=item $dep->parse($fh, $desc)

Parse a dependency line from a filehandle.

=cut

=item $dep->load($filename)

Parse a dependency line from $filename.

=item $dep->output([$fh])

=item "$dep"

Returns a string representing the dependency. If $fh is set, it prints
the string to the filehandle.

=cut

=item $dep->save($filename)

Save the dependency into the given $filename.

=cut

=item $dep->implies($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.

=cut

=item $dep->get_deps()

Returns a list of sub-dependencies, which for this object it means it
returns itself.

=cut

=item $dep->sort()

This method is a no-op for this object.

=cut

=item $dep->arch_is_concerned($arch)

Returns true if the dependency applies to the indicated architecture.

=cut

=item $dep->reduce_arch($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.

=cut

=item $dep->has_arch_restriction()

Returns the package name if the dependency applies only to a subset of
architectures.

=cut

=item $dep->profile_is_concerned()

Returns true if the dependency applies to the indicated profile.

=cut

=item $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.

=cut

=item $dep->get_evaluation($facts)

Evaluates the dependency given a list of installed packages and a list of
virtual packages provided. These lists are part of the
L<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.

=cut

=item $dep->simplify_deps($facts, @assumed_deps)

Simplifies the dependency as much as possible given the list of facts (see
class L<Dpkg::Deps::KnownFacts>) and a list of other dependencies that are
known to be true.

=cut

=item $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.

=cut

=item $dep->merge_union($other_dep)

Returns true if $dep could be modified to represent the union of both
dependencies. Otherwise returns false.

=cut

=head1 CHANGES

=head2 Version 1.02 (dpkg 1.17.10)

New methods: Add $dep->profile_is_concerned() and $dep->reduce_profiles().

=head2 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.

=head2 Version 1.00 (dpkg 1.15.6)

Mark the module as public.

=cut