http://d.puremagic.com/issues/show_bug.cgi?id=10379

           Summary: std.string.translate (and others) for a Range of
                    characters
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Phobos
        AssignedTo: nobody@puremagic.com
        ReportedBy: bearophile_hugs@eml.cc


--- Comment #0 from bearophile_hugs@eml.cc 2013-06-16 06:53:53 PDT ---
In Phobos I'd like a function like std.string.translate (or an overload of the same function) that works on a lazy Range of characters, instead of a string. This is useful to reduce the memory used when I have to process lot of data, to avoid the creation of many large intermediate strings.

(One current workaround is to use chunks, and process each piece with the
string functions).

Probably it's useful for other similar string functions to accept a lazy Range of characters, like std.string.removechars, std.string.tr, std.array.replace, etc. (This also makes a function as std.string.tr even more similar to the Posix tr).

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Andrej Mitrovic <andrej.mitrovich@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |andrej.mitrovich@gmail.com


--- Comment #1 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2013-06-17 16:38:19 PDT ---
I could imagine a generic version of it put into std.algorithm (where the translate hash table can have any Value type but the Key type would have to be the ElementType of the range), for example:

-----
string[int] table = [1 : "one", 2 : "two"];
auto inputRange = ...;  // some integer range
inputRange.translate(table);
-----

I'm not sure about the use-cases though.

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--- Comment #2 from bearophile_hugs@eml.cc 2013-06-17 17:20:41 PDT ---
(In reply to comment #1)

> I'm not sure about the use-cases though.

My request is about a translate (and other string functions) that works on a range of characters. Extending it to other kinds of data is possible, but fulfils different uses cases.

Regarding my use case, if you have a very long string (multi megabytes) and you want to apply several string functions on it, every time they generate an intermediate very large string. This sometimes requires lot of memory. When there are even large streams of textual data you may not even have enough space to keep it whole in memory. In such cases I'd like lazy string functions.

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