1 files changed, 118 insertions, 0 deletions
diff --git a/src/zope/pagetemplate/tests/batch.py b/src/zope/pagetemplate/tests/batch.py
new file mode 100644
index 0000000..ec1057c
--- /dev/null
+++ b/src/zope/pagetemplate/tests/batch.py
@@ -0,0 +1,118 @@
+##############################################################################
+#
+# Copyright (c) 2001, 2002 Zope Corporation and Contributors.
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+##############################################################################
+"""Batching support tests
+
+$Id$
+"""
+
+class batch(object):
+    """Create a sequence batch"""
+
+    def __init__(self, sequence, size, start=0, end=0,
+                 orphan=3, overlap=0):
+
+        start=start+1
+
+        start,end,sz=opt(start,end,size,orphan,sequence)
+
+        self._last=end-1
+        self._first=start-1
+
+        self._sequence=sequence
+        self._size=size
+        self._start=start
+        self._end=end
+        self._orphan=orphan
+        self._overlap=overlap
+
+    def previous_sequence(self): return self._first
+
+    def previous_sequence_end_number(self):
+        start,end,spam=opt(0, self._start-1+self._overlap,
+                           self._size, self._orphan, self._sequence)
+        return end
+
+    def previous_sequence_start_number(self):
+        start,end,spam=opt(0, self._start-1+self._overlap,
+                           self._size, self._orphan, self._sequence)
+        return start
+
+    def previous_sequence_end_item(self):
+        start,end,spam=opt(0, self._start-1+self._overlap,
+                           self._size, self._orphan, self._sequence)
+        return self._sequence[end-1]
+
+    def previous_sequence_start_item(self):
+        start,end,spam=opt(0, self._start-1+self._overlap,
+                           self._size, self._orphan, self._sequence)
+        return self._sequence[start-1]
+
+    def next_sequence_end_number(self):
+        start,end,spam=opt(self._end+1-self._overlap, 0,
+                           self._size, self._orphan, self._sequence)
+        return end
+
+    def next_sequence_start_number(self):
+        start,end,spam=opt(self._end+1-self._overlap, 0,
+                           self._size, self._orphan, self._sequence)
+        return start
+
+    def next_sequence_end_item(self):
+        start,end,spam=opt(self._end+1-self._overlap, 0,
+                           self._size, self._orphan, self._sequence)
+        return self._sequence[end-1]
+
+    def next_sequence_start_item(self):
+        start,end,spam=opt(self._end+1-self._overlap, 0,
+                           self._size, self._orphan, self._sequence)
+        return self._sequence[start-1]
+
+
+    def next_sequence(self):
+        try: self._sequence[self._end]
+        except IndexError: return 0
+        else: return 1
+
+    def __getitem__(self, index):
+        if index > self._last: raise IndexError(index)
+        return self._sequence[index+self._first]
+
+def opt(start,end,size,orphan,sequence):
+    if size < 1:
+        if start > 0 and end > 0 and end >= start:
+            size=end+1-start
+        else: size=7
+
+    if start > 0:
+
+        try: sequence[start-1]
+        except: start=len(sequence)
+
+        if end > 0:
+            if end < start: end=start
+        else:
+            end=start+size-1
+            try: sequence[end+orphan-1]
+            except: end=len(sequence)
+    elif end > 0:
+        try: sequence[end-1]
+        except: end=len(sequence)
+        start=end+1-size
+        if start - 1 < orphan: start=1
+    else:
+        start=1
+        end=start+size-1
+        try: sequence[end+orphan-1]
+        except: end=len(sequence)
+    return start,end,size