On 2014-05-28, at 11:10 , Aravinda VK <[email protected]> wrote:
> Hi,
>
> How to find number of characters in a string?
Problem 1: define character. Do you mean a glyph? A grapheme cluster? A
code point? Composed or decomposed?
Problem 2: what use is knowing the length of a string?
.len() returns the length of the string in bytes (using its underlying
UTF-8 representation), .char_len() returns the number of non-normalized
code points. AFAIK there is no way to know the number of grapheme
clusters (I don't think there is a Rust implementation of UAX #29) and
glyphs make no sense for text which is not rendered.
> Following example returns byte count instead of number of characters.
>
> use std::string::String;
>
> fn main() {
> let unicode_str = String::from_str("ಅ");
> let ascii_str = String::from_str("a");
> println!("unicode str: {}, ascii str: {}", unicode_str.len(),
> ascii_str.len());
> }
>
> --
> Regards
> Aravinda | ಅರವಿಂದ
> http://aravindavk.in
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