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# -*- coding: utf-8 -*-
#
# File: portato/dependency.py
# This file is part of the Portato-Project, a graphical portage-frontend.
#
# Copyright (C) 2008 René 'Necoro' Neumann
# This is free software. You may redistribute copies of it under the terms of
# the GNU General Public License version 2.
# There is NO WARRANTY, to the extent permitted by law.
#
# Written by René 'Necoro' Neumann <necoro@necoro.net>
"""
Provides classes for the presentation of dependencies.
"""
from __future__ import absolute_import, with_statement
__docformat__ = "restructuredtext"
from .helper import debug
from .backend import system
class Dependency (object):
"""
A simple dependency as it also is noted inside ebuilds.
:IVariables:
dep : string
The dependency string. It is immutable.
satisfied : boolean
Is this dependency satisfied?
"""
def __init__ (self, dep):
"""
Creates a dependency out of a dep string.
:param dep: dependency string
:type dep: string
"""
self._dep = dep
def is_satisfied (self):
"""
Checks if this dependency is satisfied.
:rtype: boolean
"""
return system.find_best_match(self.dep, only_cpv = True, only_installed = True) is not None
def __cmp__ (self, b):
return cmp(self.dep, b.dep)
def __hash__ (self):
return hash(self.dep)
def __str__ (self):
return "<Dependency '%s'>" % self.dep
__repr__ = __str__
def _get_dep (self):
return self._dep
dep = property(_get_dep)
satisfied = property(is_satisfied)
class OrDependency (Dependency):
"""
Dependency representing an "or".
:note: Order is important. ``|| ( a b )`` != ``|| ( b a )``
:IVariables:
dep : tuple(string,...)
The dependency strings. The tuple and the strings are immutable.
"""
def __init__ (self, deps):
"""
Creates an or-dependency out of a list (or tuple) of deps.
:param deps: The or'ed dependencies.
:type deps: iter<string>
"""
self._dep = tuple(Dependency(dep) for dep in deps)
def __str__ (self):
return "<|| %s>" % str(self.dep)
__repr__ = __str__
class DependencyTree (object):
"""
The DependencyTree shows all dependencies for a package and shows which useflags want which dependencies.
:IVariables:
deps : set(`Dependency`)
The list of dependencies which are not dependent on a useflag.
flags : string -> `DependencyTree`
Holds the additional dependency trees per useflag.
"""
def __init__ (self):
self.deps = set()
self.flags = {}
def add (self, dep, *moredeps):
"""
Adds one or more normal dependencies to the tree.
:Parameters:
dep : string
A dependency string.
moredeps
More parameters are allowed :)
"""
self.deps.add(Dependency(dep))
for dep in moredeps:
self.deps.add(Dependency(dep))
def add_or (self, orlist):
"""
Adds a list of dependencies, which are or'ed.
:param orlist: the dependency list
:type orlist: iter<string>
"""
self.deps.add(OrDependency(orlist))
def add_flag (self, flag):
"""
Adds a new useflag to this tree.
For convenience the newly created sub-tree is returned.
:param flag: the new flag
:rtype: `DependencyTree`
"""
if not flag in self.flags:
self.flags[flag] = DependencyTree()
return self.get_flag_tree(flag)
def get_flag_tree (self, flag):
"""
Returns the sub-tree of a specific tree.
:raises KeyError: if the flag is not (yet) in this tree
:rtype: `DependencyTree`
"""
return self.flags[flag]
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