What type does byGrapheme() return?
Robert M. Münch
robert.muench at saphirion.com
Sun Dec 29 12:19:09 UTC 2019
On 2019-12-27 19:44:59 +0000, H. S. Teoh said:
> Since graphemes are variable-length in terms of code points, you can't
> exactly *edit* a range of graphemes -- you can't replace a 1-codepoint
> grapheme with a 6-codepoint grapheme, for example, since there's no
> space in the underlying string to store that.
Hi, my idea was that when I use a grapheme range, it will abstract away
that graphemes consist of different sized code-points. And the docs at
https://dlang.org/phobos/std_uni.html#byGrapheme show an example using
this kind of range:
auto gText = text.byGrapheme;
But maybe I need to get a better understanding of the ranges stuff too...
> If you want to add/delete/change graphemes, what you *really* want is to
> use an array of Graphemes:
> Grapheme editableGraphs;
> You can then splice it, insert stuff, delete stuff, whatever.
> When you're done with it, convert it back to string with something like
> string result = editableGraphs.map!(g => g).joiner.to!string;
I played around with this approach...
string r1 = "Robert M. Münch";
// Code-Units = 16
// Code-Points = 15
// Graphemes = 15
Grapheme gr1 = r1.byGrapheme.array;
writeln(" Text = ", gr1.map!(g => g).joiner.to!string);
// Text = obert M. Münch
writeln("wText = ", gr1.map!(g => g).joiner.to!wstring);
// wText = obert M. Münch
writeln("dText = ", gr1.map!(g => g).joiner.to!dstring);
// dText = obert M. Münch
Why is the first letter missing? Is this a bug?
Robert M. Münch
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