Re: Grapheme clusters and east asian width

[Asmus Freytag (t)]

On 9/15/2015 6:45 PM, Daniel Bünzli wrote: Hello, Is there any guidance on how to combine the information given by grapheme clusters and the east asian width property to do fixed-width layouts in terminal emulators ? For example if we have: U+AC01 ( 각 ) HANGUL SYLLABLE GAG This will delimit a single grapheme cluster with east asian width W and hence 2 columns in a tty. However if we have it as the sequence: U+1100 ( ᄀ ) HANGUL CHOSEONG KIYEOK U+1161 ( ᅡ ) HANGUL JUNGSEONG A U+11A8 ( ᆨ ) HANGUL JONGSEONG KIYEOK This will delimit a single grapheme cluster, but if I try to add up their east asian widths (W, N, N), this would result in 4 columns. No, this is a misreading of "N". "N" doesn't mean "narrow" but "neutral" - that is, the width is given by other consideration. In this case, the width is zero, because these code points are "conjoining" jamos, so in a sequence of them, they are supposed to "conjoin" into a single shape, in this case equivalent to U+AC01. Look at combining marks, for example, they all have "N" as a value, but that does not mean they are suddenly supposed to take up a display position on their own. A./