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digitalmars.D.bugs - [Issue 10379] New: std.string.translate (and others) for a Range of characters

reply d-bugmail puremagic.com writes:
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



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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Jun 16 2013
next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=10379


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

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



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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Jun 17 2013
prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=10379







 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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Jun 17 2013