1 files changed, 26 insertions, 0 deletions

diff --git a/crates/ra_syntax/src/parsing/lexer/classes.rs b/crates/ra_syntax/src/parsing/lexer/classes.rs
new file mode 100644
index 000000000..4235d2648
--- /dev/null
+++ b/crates/ra_syntax/src/parsing/lexer/classes.rs
@@ -0,0 +1,26 @@
+use unicode_xid::UnicodeXID;
+
+pub fn is_ident_start(c: char) -> bool {
+    (c >= 'a' && c <= 'z')
+        || (c >= 'A' && c <= 'Z')
+        || c == '_'
+        || (c > '\x7f' && UnicodeXID::is_xid_start(c))
+}
+
+pub fn is_ident_continue(c: char) -> bool {
+    (c >= 'a' && c <= 'z')
+        || (c >= 'A' && c <= 'Z')
+        || (c >= '0' && c <= '9')
+        || c == '_'
+        || (c > '\x7f' && UnicodeXID::is_xid_continue(c))
+}
+
+pub fn is_whitespace(c: char) -> bool {
+    //FIXME: use is_pattern_whitespace
+    //https://github.com/behnam/rust-unic/issues/192
+    c.is_whitespace()
+}
+
+pub fn is_dec_digit(c: char) -> bool {
+    '0' <= c && c <= '9'
+}