Hello Mark,
thanks for explanation and also for your solution. I will try.
Maybe i should get my book "regular expressions" from Jeffrey E.F.Friedl from
the shelf and should finish reading it, so i could make use of regular
expressions in Livecode more often.
Regards,
Matthias
> Am 03.09.2023 um 11:49 schrieb Mark Waddingham via use-livecode
> <use-livecode@lists.runrev.com>:
>
> On 2023-09-03 10:26, panagiotis m via use-livecode wrote:
>> Hello Matthias,
>> I do not think that the syntax "sort <container> by sortKey1 and sortKey2"
>> is supported
>
> Heh technically it 'is' - and does do something but it won't be what you
> expected...
>
> So the syntax for sort in this case is:
>
> sort <container> by <expression>
>
> This works by iterating over the elements in <container>, passing each
> through the expression to generate a sort key list, sorting that list and
> then reordering the original list.
>
> Expressions can contain the boolean 'and' operator, so:
>
> sort <container> by X and Y
>
> Means that the sort key is evaluated as 'X and Y' for each element - meaning
> sort ends up sorting a list of 'true' and 'false' values.
>
> As Panos says, if you want to sort by separate fields with decreasing
> priority you need to do multiple sorts from least priority to most - this
> works because 'sort' is stable (if two elements compare the same, then the
> order of them in the output list is the same as the first).
>
> The alternative is to work out a sort expression which combines the two parts
> of the element you want to sort so that the sort keys sort in that order.
> This can be quite tricky, but (for example) - let's say your container has
> elements of the form:
>
> <section-number>,<sub-section-number>
>
> So you want things in the 'obvious' sorted order - then you could use:
>
> sort tSections ascending text by format("%08d%08d", item 1 of each, item 2
> of each)
>
> Here the sortkey is defined so that the text sort of the sort keys is that
> same as sorting first by sub-section number and then by section number.
>
> Warmest Regards,
>
> Mark.
>
> --
> Mark Waddingham ~ m...@livecode.com ~ http://www.livecode.com/
> LiveCode: Build Amazing Things
>
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