[CalendarServer-changes] [13032] CalendarServer/branches/users/sagen/move2who-4/txdav/dps/json.py

[source_changes at macosforge.org]

Revision: 13032
          http://trac.calendarserver.org//changeset/13032
Author:   wsanchez at apple.com
Date:     2014-03-28 13:57:18 -0700 (Fri, 28 Mar 2014)
Log Message:
-----------
Implement expressionAsJSONText()

Added Paths:
-----------
    CalendarServer/branches/users/sagen/move2who-4/txdav/dps/json.py

Added: CalendarServer/branches/users/sagen/move2who-4/txdav/dps/json.py
===================================================================
--- CalendarServer/branches/users/sagen/move2who-4/txdav/dps/json.py	                        (rev 0)
+++ CalendarServer/branches/users/sagen/move2who-4/txdav/dps/json.py	2014-03-28 20:57:18 UTC (rev 13032)
@@ -0,0 +1,90 @@
+##
+# Copyright (c) 2014 Apple Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+##
+
+from __future__ import absolute_import
+
+"""
+JSON serialization utilities.
+"""
+
+__all__ = [
+    "expressionAsJSONText",
+    "expressionFromJSONText",
+]
+
+from json import dumps, loads as from_json_text
+
+from twext.who.expression import (
+    CompoundExpression, Operand,
+    MatchExpression, MatchType, MatchFlags,
+)
+
+
+
+def expressionAsJSONText(expression):
+    return to_json_text(expressionAsJSON(expression))
+
+
+def expressionAsJSON(expression):
+    if isinstance(expression, CompoundExpression):
+        return compoundExpressionAsJSON(expression)
+
+    if isinstance(expression, MatchExpression):
+        return matchExpressionAsJSON(expression)
+
+    raise NotImplementedError(
+        "Unknown expression type: {!r}".format(expression)
+    )
+
+
+def compoundExpressionAsJSON(expression):
+    return dict(
+        type=expression.__class__.__name__,
+        operand=expression.operand.name,
+        expressions=[expressionAsJSON(e) for e in expression.expressions],
+    )
+
+
+def matchExpressionAsJSON(expression):
+    return dict(
+        type=expression.__class__.__name__,
+        field=expression.fieldName.name,
+        value=expression.fieldValue,
+        match=expression.matchType.name,
+        flags=expression.flags.name,
+    )
+    raise NotImplementedError()
+
+
+def expressionFromJSONText(jsonText):
+    Operand
+    MatchType, MatchFlags
+    from_json_text
+    raise NotImplementedError()
+
+
+
+def to_json_text(obj):
+    """
+    Convert an object into JSON text.
+
+    @param obj: An object that is serializable to JSON.
+    @type obj: L{object}
+
+    @return: JSON text.
+    @rtype: L{unicode}
+    """
+    return dumps(obj, separators=(',', ':')).decode("UTF-8")
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