diff --git a/src/grapheme.rs b/src/grapheme.rs
index b66536e..176a7aa 100644
--- a/src/grapheme.rs
+++ b/src/grapheme.rs
@@ -284,12 +284,30 @@ impl GraphemeCursor {
fn grapheme_category(&mut self, ch: char) -> GraphemeCat {
use tables::grapheme as gr;
- // If this char isn't within the cached range, update the cache to the
- // range that includes it.
- if (ch as u32) < self.grapheme_cat_cache.0 || (ch as u32) > self.grapheme_cat_cache.1 {
- self.grapheme_cat_cache = gr::grapheme_category(ch);
+ use tables::grapheme::GraphemeCat::*;
+
+ if ch <= '\u{7e}' {
+ // Special-case optimization for ascii, except U+007F. This
+ // improves performance even for many primarily non-ascii texts,
+ // due to use of punctuation and white space characters from the
+ // ascii range.
+ if ch >= '\u{20}' {
+ GC_Any
+ } else if ch == '\n' {
+ GC_LF
+ } else if ch == '\r' {
+ GC_CR
+ } else {
+ GC_Control
+ }
+ } else {
+ // If this char isn't within the cached range, update the cache to the
+ // range that includes it.
+ if (ch as u32) < self.grapheme_cat_cache.0 || (ch as u32) > self.grapheme_cat_cache.1 {
+ self.grapheme_cat_cache = gr::grapheme_category(ch);
+ }
+ self.grapheme_cat_cache.2
}
- self.grapheme_cat_cache.2
}
// Not sure I'm gonna keep this, the advantage over new() seems thin.
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