From 19e1f9afb7be4fd3a6012165164b64ba4b063b6d Mon Sep 17 00:00:00 2001
From: Andreas Kloeckner <inform@tiker.net>
Date: Wed, 19 Feb 2014 15:02:19 -0600
Subject: [PATCH] Move PersistentHashWalkMapper from loopy
---
pymbolic/mapper/persistent_hash.py | 47 ++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
create mode 100644 pymbolic/mapper/persistent_hash.py
diff --git a/pymbolic/mapper/persistent_hash.py b/pymbolic/mapper/persistent_hash.py
new file mode 100644
index 0000000..40783ca
--- /dev/null
+++ b/pymbolic/mapper/persistent_hash.py
@@ -0,0 +1,47 @@
+from __future__ import division
+
+__copyright__ = "Copyright (C) 2009-2013 Andreas Kloeckner"
+
+__license__ = """
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+"""
+
+
+from pymbolic.mapper import WalkMapper
+
+
+class PersistentHashWalkMapper(WalkMapper):
+ """A subclass of :class:`loopy.symbolic.WalkMapper` for constructing
+ persistent hash keys for use with
+ :class:`pytools.persistent_dict.PersistentDict`.
+
+ See also :meth:`LoopyKeyBuilder.update_for_pymbolic_expression`.
+ """
+
+ def __init__(self, key_hash):
+ self.key_hash = key_hash
+
+ def visit(self, expr):
+ self.key_hash.update(type(expr).__name__.encode("utf8"))
+
+ def map_variable(self, expr):
+ self.key_hash.update(expr.name.encode("utf8"))
+
+ def map_constant(self, expr):
+ self.key_hash.update(repr(expr).encode("utf8"))
--
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