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Re: Reversing the lines in a file[speed, stack overflow}
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Re: Reversing the lines in a file[speed, stack overflow}


  • Subject: Re: Reversing the lines in a file[speed, stack overflow}
  • From: Paul Berkowitz <email@hidden>
  • Date: Sat, 11 May 2002 07:55:46 -0700
  • Resent-date: Sat, 11 May 2002 08:38:16 -0700
  • Resent-from: Paul Berkowitz <email@hidden>
  • Resent-message-id: <B9027F02.26AA1¾email@hidden>
  • Resent-to: Applescript-Users <email@hidden>

There is, though. It's probably extremely large, but there's a limit. I
realize I didn't have to set the chunks at 30,000, but I don't know how big
they should be so I chose 30K arbitrarily. I guess I should experiment to
find out. But when I tried to read a huge MBOX file, it couldn't do it. Not
"Stack overflow", but "Out of memory": and that's in OS X which doesn't have
application memory limitations. It was an AS memory limit for reading files
(not for string variables, which doesn't seem to have any). Reading in a
chunk at a time and concatenating to the agglomerated string works fine, and
very fast. It was a 129 MB file, as I recall. Maybe the limit is 32 MB? It's
worth trying to find out, I guess. If you say reading a 6 MB file works OK,
then my 30K is a little silly, I suppose.


--
Paul Berkowitz

On 5/11/02 7:40 AM, "Paul Skinner" <email@hidden> wrote:

> What's wrong with just...
>
> read file "Dalai:Users:paulskin:Desktop:1024000Line6MBDocument"
>
> Maybe you were thinking about the text to list conversion limit. I don't
> think that there's a limit to the data the read file command can get.
>
> On Friday, May 10, 2002, at 06:19 PM, Paul Berkowitz wrote:
>
>> On 5/10/02 10:30 AM, "Paul Skinner" <email@hidden> wrote:
>>
>>> On Friday, May 10, 2002, at 12:02 PM, Cornwall wrote:
>>>
>>>> paragraphs of (read theFil)
>>>
>>> When fed a really big hunk of text, this returns a list greater than AS
>>> allows as the result of a single command.
>>>
>>> Somehow the 'read as list' gets around this limit. Apparently being an
>>> OSAX lets you flaunt the rules.
>>
>> Here's my contribution to this discussion. It's awfully simple, so I
>> must be
>> the 4000th person to come up with it, I imagine. There's no limit
>> whatsoever
>> that I can discover. It even read a 100+ MB (that's MB, not KB) MBOX
>> file
>> containing large encoded email attachments.
>>
>>
>> on ReadPartials(fileRef)
>>
>> local b, y, r, textClump
>>
>> set b to 1
>> set y to 30000
>>
>> set r to ""
>>
>> set finished to false
>>
>> repeat until finished
>>
>> try
>> set textClump to read fileRef from b to y
>> set r to r & textClump
>> on error -- last text clump
>> set textClump to read fileRef from b to eof
>> set r to r & textClump
>> set finished to true
>> end try
>>
>> set {b, y} to {b + 30000, y + 30000}
>>
>> end repeat
>>
>> return r
>>
>> end ReadPartials
>>
>>
>>
>> --
>> Paul Berkowitz
>> _______________________________________________
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>>
>>
> --
> Paul Skinner
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