From 4abdafcd158ab15d9d2ae18553067578ae559d33 Mon Sep 17 00:00:00 2001
From: Laurenz <laurmaedje@gmail.com>
Date: Thu, 13 Jan 2022 19:49:52 +0100
Subject: Faster byte/utf-16 offset conversions

---
 src/util/mod.rs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'src/util')

diff --git a/src/util/mod.rs b/src/util/mod.rs
index 694c90c8..61e7131d 100644
--- a/src/util/mod.rs
+++ b/src/util/mod.rs
@@ -13,6 +13,19 @@ use std::ops::Range;
 use std::path::{Component, Path, PathBuf};
 use std::rc::Rc;
 
+/// Additional methods for strings.
+pub trait StrExt {
+    /// The number of code units this string would use if it was encoded in
+    /// UTF16. This runs in linear time.
+    fn len_utf16(&self) -> usize;
+}
+
+impl StrExt for str {
+    fn len_utf16(&self) -> usize {
+        self.chars().map(char::len_utf16).sum()
+    }
+}
+
 /// Additional methods for options.
 pub trait OptionExt<T> {
     /// Sets `other` as the value if `self` is `None` or if it contains a value
-- 
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