1 files changed, 4 insertions, 0 deletions

diff --git a/src/lexer/classes.rs b/src/lexer/classes.rs
index 7cc050bde..4235d2648 100644
--- a/src/lexer/classes.rs
+++ b/src/lexer/classes.rs
@@ -20,3 +20,7 @@ pub fn is_whitespace(c: char) -> bool {
     //https://github.com/behnam/rust-unic/issues/192
     c.is_whitespace()
 }
+
+pub fn is_dec_digit(c: char) -> bool {
+    '0' <= c && c <= '9'
+}