GetConstraintsForPurgeHelper

1 files changed, 98 insertions, 0 deletions

diff --git a/paludis/resolver/get_constraints_for_purge_helper.cc b/paludis/resolver/get_constraints_for_purge_helper.cc
new file mode 100644
index 000000000..507290a25
--- /dev/null
+++ b/paludis/resolver/get_constraints_for_purge_helper.cc
@@ -0,0 +1,98 @@
+/* vim: set sw=4 sts=4 et foldmethod=syntax : */
+
+/*
+ * Copyright (c) 2010 Ciaran McCreesh
+ *
+ * This file is part of the Paludis package manager. Paludis is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU General
+ * Public License version 2, as published by the Free Software Foundation.
+ *
+ * Paludis is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <paludis/resolver/get_constraints_for_purge_helper.hh>
+#include <paludis/resolver/reason.hh>
+#include <paludis/resolver/constraint.hh>
+#include <paludis/resolver/resolvent.hh>
+#include <paludis/resolver/resolution.hh>
+#include <paludis/resolver/decision.hh>
+#include <paludis/util/pimp-impl.hh>
+#include <paludis/util/simple_visitor_cast.hh>
+#include <paludis/util/make_shared_copy.hh>
+#include <paludis/util/make_named_values.hh>
+#include <paludis/util/stringify.hh>
+#include <paludis/dep_spec.hh>
+#include <paludis/package_id.hh>
+#include <paludis/package_dep_spec_collection.hh>
+#include <paludis/partially_made_package_dep_spec.hh>
+#include <paludis/elike_slot_requirement.hh>
+#include <paludis/metadata_key.hh>
+
+using namespace paludis;
+using namespace paludis::resolver;
+
+namespace paludis
+{
+    template <>
+    struct Imp<GetConstraintsForPurgeHelper>
+    {
+        const Environment * const env;
+        PackageDepSpecCollection purge_specs;
+
+        Imp(const Environment * const e) :
+            env(e)
+        {
+        }
+    };
+}
+
+GetConstraintsForPurgeHelper::GetConstraintsForPurgeHelper(const Environment * const e) :
+    Pimp<GetConstraintsForPurgeHelper>(e)
+{
+}
+
+GetConstraintsForPurgeHelper::~GetConstraintsForPurgeHelper() = default;
+
+void
+GetConstraintsForPurgeHelper::add_purge_spec(const PackageDepSpec & spec)
+{
+    _imp->purge_specs.insert(spec);
+}
+
+const std::shared_ptr<ConstraintSequence>
+GetConstraintsForPurgeHelper::operator() (
+        const std::shared_ptr<const Resolution> &,
+        const std::shared_ptr<const PackageID> & id,
+        const std::shared_ptr<const ChangeByResolventSequence> & was_used_by_ids) const
+{
+    const std::shared_ptr<ConstraintSequence> result(std::make_shared<ConstraintSequence>());
+
+    PartiallyMadePackageDepSpec partial_spec({ });
+    partial_spec.package(id->name());
+    if (id->slot_key())
+        partial_spec.slot_requirement(std::make_shared<ELikeSlotExactRequirement>(id->slot_key()->value(), false));
+    PackageDepSpec spec(partial_spec);
+
+    const std::shared_ptr<WasUsedByReason> reason(std::make_shared<WasUsedByReason>(was_used_by_ids));
+
+    result->push_back(std::make_shared<Constraint>(make_named_values<Constraint>(
+                    n::destination_type() = dt_install_to_slash,
+                    n::nothing_is_fine_too() = true,
+                    n::reason() = reason,
+                    n::spec() = BlockDepSpec("!" + stringify(spec), spec, false),
+                    n::untaken() = ! _imp->purge_specs.match_any(_imp->env, id, { }),
+                    n::use_existing() = ue_if_possible
+                    )));
+
+    return result;
+}
+
+template class Pimp<GetConstraintsForPurgeHelper>;
+