tree 3cbe83f0d8ddda3d9b6753989c0b0ad14bb71ee5
parent 4482a914f52311356f6f4b7a695d4075ca22c0c6
author Patrick Gundlach <gundlach@speedata.de> 1604578510 +0100
committer Ian Lance Taylor <iant@golang.org> 1606227731 +0000

text/unicod/bidi: implement API, remove panics

The bidi API splits strings with mixed left-to-right (ltr) and
right-to-left (rtl) parts into substrings (segments). Each segment
contains a substring, a direction of text flow (either ltr or rtl)
and the start and end positions in the input.

The paragraph validators do not panic, instead the newParagraph function
returns an error message in case the input is invalid.

Fixes golang/go#42356

Change-Id: I90cafc8fadb0cf6936dfb1ab373586017147d709
Reviewed-on: https://go-review.googlesource.com/c/text/+/267857
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>