Today's programming challenge - How's your Range-Fu ?
John Colvin via Digitalmars-d
digitalmars-d at puremagic.com
Sun Apr 19 00:26:35 PDT 2015
On Saturday, 18 April 2015 at 16:01:20 UTC, Andrei Alexandrescu
wrote:
> On 4/18/15 4:35 AM, Jacob Carlborg wrote:
>> On 2015-04-18 12:27, Walter Bright wrote:
>>
>>> That doesn't make sense to me, because the umlauts and the
>>> accented e
>>> all have Unicode code point assignments.
>>
>> This code snippet demonstrates the problem:
>>
>> import std.stdio;
>>
>> void main ()
>> {
>> dstring a = "e\u0301";
>> dstring b = "é";
>> assert(a != b);
>> assert(a.length == 2);
>> assert(b.length == 1);
>> writefln(a, " ", b);
>> }
>>
>> If you run the above code all asserts should pass. If your
>> system
>> correctly supports Unicode (works on OS X 10.10) the two
>> printed
>> characters should look exactly the same.
>>
>> \u0301 is the "combining acute accent" [1].
>>
>> [1] http://www.fileformat.info/info/unicode/char/0301/index.htm
>
> Isn't this solved commonly with a normalization pass? We should
> have a normalizeUTF() that can be inserted in a pipeline. Then
> the rest of Phobos doesn't need to mind these combining
> characters. -- Andrei
Normalisation can allow some simplifications, sometimes, but
knowing whether it will or not requires a lot of a priori
knowledge about the input as well as the normalisation form.
More information about the Digitalmars-d
mailing list