Please post this in the Collector at http://zope.org/Collectors/Zope
jens
On Mar 22, 2004, at 7:09, AP Meyer wrote:
Hi Zopers
It seems that there is a bug in ZTUtil.Batch: when the batch should be
the length of the batch and there are exactly as many orphans as there
would fit on one page the length of the batch becomes size instead of
size+orphans.
Here are the numbers:
no of
batchesstartendorphanlengthsequence_length
1 112 3 1212
1 110 3 1013 WRONG *
2 110 3 1014
* end and length should be 13 in this case, 3 items are omitted
length=12 length=13 length=14
1 1 1
2 2 2
3 3 3
4 4 4
5 5 5
6 6 6
7 7 7
8 8 8
9 9 9
10 10 10
11 11 | second batch
12 12 |
13 |
14 |
So, there is a jump on the edge where there should be one batch of the
length sequence_length == length+orphans. At that point 3 (in the
above case) items disappear.
I have looked at the code in ZTUtils.Batch.py and found the following
solution (line 109):
94 def opt(start,end,size,orphan,sequence):
95 if size 1:
96 if start 0 and end 0 and end = start:
97 size=end+1-start
98 else: size=7
99
100 if start 0:
101
102 try: sequence[start-1]
103 except IndexError: start=len(sequence)
104
105 if end 0:
106 if end start: end=start
107 else:
108 end=start+size-1
109 #try: sequence[end+orphan-1]
110 try: sequence[end+orphan] # replace above with
this
111 except IndexError: end=len(sequence)
112 ...
Can somebody confirm that this solution is correct and modify it in
the CVS, please?
NB This has been run in Zope 2.7 with Python 2.3.3.
thanks
Andre
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