Fun, fun… So if you collect ALL the opening and closing strings, and hopefully these never overlap, then each pair can be “ordered”. Now identifying each is just a matter of thinking in terms of “pairs” of offsets. You can then identify each by their “paired” position in the forward direction.
Or am i missing it still? Craig > On Mar 23, 2023, at 12:29 PM, François via use-livecode > <use-livecode@lists.runrev.com> wrote: > > An example of when a backwards search would be useful is the following: > > In the app, you have to find command environments. Environments are delimited > by an opening string and a closing string. > > Usually, I search forward for the opening string, then search for the closing > string afterwards. Once this occurrence is processed, the app goes on with a > forward search. > > Now another problem: I want to see in which environment a text position is > in, i.e. finding the enclosing opening and closing strings. > > Looking for the closing string is a no brainer. Looking for the opening > string is no more difficult if I can do a backwards search. > > However, if I can only search forward, I must start the search at the > beginning of the text to scan all the occurrences of the opening string that > stand before the text position (if any). The complexity of this approach is > not the same as in the case where a backwards search is available. > > François > >> Le 23 mars 2023 à 16:48, Craig Newman via use-livecode >> <use-livecode@lists.runrev.com> a écrit : >> >> Francois. >> >> I am sure you know what you have and what you need. >> >> But just for my curiosity, if I had to do what you want, I would have used >> the “offset” function and its “charsToSkip” parameter to find all instances >> of the text to find, and then use those values in sequence to work >> backwards. But then how do you know when to stop? >> >> Craig >> >>> On Mar 23, 2023, at 11:30 AM, François via use-livecode >>> <use-livecode@lists.runrev.com> wrote: >>> >>> The text source is not very big. >>> >>> However I implement transcoding from one language to another and I do an >>> VERY large amount of search and replace. >>> >>> I think I have quite optimized my LC code but transcoding can take 5 >>> minutes to do, and I need the whole process to chase unexpected bugs. This >>> is using the forward search (offset) most of the time. >>> >>> Using a standalone app takes the time down to 4 minutes, which is not a >>> sufficient gain for my usage. >>> >>> François >>> >>>> Le 23 mars 2023 à 16:21, Craig Newman via use-livecode >>>> <use-livecode@lists.runrev.com> a écrit : >>>> >>>> Francois. >>>> >>>> Who wouldn’t? >>>> >>>> But unless you are working with VERY large datasets, I bet a handler would >>>> process quickly. >>>> >>>> Craig >>>> >>>>> On Mar 23, 2023, at 10:58 AM, François via use-livecode >>>>> <use-livecode@lists.runrev.com> wrote: >>>>> >>>>> @Ben >>>>> >>>>> Too bad… >>>>> >>>>> @ Craig >>>>> >>>>> I would rather have an optimized version, I do a lot of text processing >>>>> in my app. >>>>> >>>>> Thanks to both of you! >>>>> François >>>>> >>>>>> Le 23 mars 2023 à 14:43, Craig Newman via use-livecode >>>>>> <use-livecode@lists.runrev.com> a écrit : >>>>>> >>>>>> @Ben. >>>>>> >>>>>> 20 years! Congratulations!. >>>>>> >>>>>> @Francois >>>>>> >>>>>> This can be scripted easily. Do you need help with that? >>>>>> >>>>>> Craig >>>>>> >>>>>>> On Mar 23, 2023, at 8:21 AM, Ben Rubinstein via use-livecode >>>>>>> <use-livecode@lists.runrev.com> wrote: >>>>>>> >>>>>>> https://quality.livecode.com/show_bug.cgi?id=584 (20th anniversary this >>>>>>> September!) >>>>>>> >>>>>>> Also >>>>>>> https://quality.livecode.com/show_bug.cgi?id=8353 >>>>>>> >>>>>>> >>>>>>> >>>>>>> On 23/03/2023 11:35, François via use-livecode wrote: >>>>>>>> I would like to search for a string within another string, starting at >>>>>>>> a given position, but backward. >>>>>>>> In some languages, you can achieve that by providing a negative number >>>>>>>> for the initial position of the search. >>>>>>>> Is this possible in LiveCode? >>>>>>>> TIA >>>>>>>> François >>>>>>>> _______________________________________________ >>>>>>>> use-livecode mailing list >>>>>>>> use-livecode@lists.runrev.com >>>>>>>> Please visit this url to subscribe, unsubscribe and manage your >>>>>>>> subscription preferences: >>>>>>>> http://lists.runrev.com/mailman/listinfo/use-livecode >>>>>>> >>>>>>> _______________________________________________ >>>>>>> use-livecode mailing list >>>>>>> use-livecode@lists.runrev.com >>>>>>> Please visit this url to subscribe, unsubscribe and manage your >>>>>>> subscription preferences: >>>>>>> http://lists.runrev.com/mailman/listinfo/use-livecode >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> use-livecode mailing list >>>>>> use-livecode@lists.runrev.com >>>>>> Please visit this url to subscribe, unsubscribe and manage your >>>>>> subscription preferences: >>>>>> http://lists.runrev.com/mailman/listinfo/use-livecode >>>>> >>>>> >>>>> _______________________________________________ >>>>> use-livecode mailing list >>>>> use-livecode@lists.runrev.com >>>>> Please visit this url to subscribe, unsubscribe and manage your >>>>> subscription preferences: >>>>> http://lists.runrev.com/mailman/listinfo/use-livecode >>>> >>>> >>>> _______________________________________________ >>>> use-livecode mailing list >>>> use-livecode@lists.runrev.com >>>> Please visit this url to subscribe, unsubscribe and manage your >>>> subscription preferences: >>>> http://lists.runrev.com/mailman/listinfo/use-livecode >>> >>> >>> _______________________________________________ >>> use-livecode mailing list >>> use-livecode@lists.runrev.com >>> Please visit this url to subscribe, unsubscribe and manage your >>> subscription preferences: >>> http://lists.runrev.com/mailman/listinfo/use-livecode >> >> >> _______________________________________________ >> use-livecode mailing list >> use-livecode@lists.runrev.com >> Please visit this url to subscribe, unsubscribe and manage your subscription >> preferences: >> http://lists.runrev.com/mailman/listinfo/use-livecode > > > _______________________________________________ > use-livecode mailing list > use-livecode@lists.runrev.com > Please visit this url to subscribe, unsubscribe and manage your subscription > preferences: > http://lists.runrev.com/mailman/listinfo/use-livecode _______________________________________________ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
