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digitalmars.D.learn - String range to dchar.

reply "Samuel Pike" <spike21 gmail.com> writes:
Hi all.

First time posting here. I recently downloaded the dmd compiler 
and started making a few exercises with the language. Nice 
language features but still somewhat confused with the library.

If I use byDchar() over a "string" is there a possibility to get 
part of a character or is guaranteed that the entire visual 
character will be in the dchar?

Also, is there a way to peek into a range? Maybe a range that 
buffers its items when calling peek()?

Thank you
Oct 30 2014
next sibling parent "Meta" <jared771 gmail.com> writes:
On Friday, 31 October 2014 at 00:17:02 UTC, Samuel Pike wrote:

 Hi all.

 First time posting here. I recently downloaded the dmd compiler 
 and started making a few exercises with the language. Nice 
 language features but still somewhat confused with the library.

 If I use byDchar() over a "string" is there a possibility to 
 get part of a character or is guaranteed that the entire visual 
 character will be in the dchar?

 Also, is there a way to peek into a range? Maybe a range that 
 buffers its items when calling peek()?

 Thank you


You should just be able to call the range's .front method, which 
will do the decoding. However, calling .front on just a normal 
string without using byDchar will also work, as front 
automatically decodes by default.

void main()
{
	string s = "中文汉字";
	writeln(s[0]);       //Prints '?'
	writeln(s.front);    //Prints '中'
}
Oct 30 2014
prev sibling parent "H. S. Teoh via Digitalmars-d-learn" <digitalmars-d-learn puremagic.com> writes:
On Fri, Oct 31, 2014 at 12:17:00AM +0000, Samuel Pike via Digitalmars-d-learn
wrote:

 Hi all.
 
 First time posting here. I recently downloaded the dmd compiler and
 started making a few exercises with the language. Nice language
 features but still somewhat confused with the library.
 
 If I use byDchar() over a "string" is there a possibility to get part
 of a character or is guaranteed that the entire visual character will
 be in the dchar?


[...]

A dchar corresponds with a Unicode code point, but that doesn't always
correspond with a "visual character" (e.g., if you have a base character
followed by a combining diacritic, they would come out as two dchars).
The Unicode term for "visual character" is "grapheme". If you want to
process the string by grapheme, use byGrapheme() from std.uni.


T

-- 
EMACS = Extremely Massive And Cumbersome System
Oct 30 2014