refactor: remove regex dependency

CHANGELOG.md

@@ -9,6 +9,7 @@
 **Maintenance**
 
 - Refactored command execution for better error handling and code organization
+- Remove regex dependency
 
 ## v0.8.0 (2024-04-05)
 

Cargo.toml

@@ -22,5 +22,4 @@ structopt = "0.3.26"
 rust-embed = "5.7.0"
 inkwell = { version = "0.5.0", features = ["llvm10-0"], optional = true }
 qbe = "1.0.0"
-regex = "1.11.1"
 lazy_static = "1.5.0"

src/lexer/mod.rs

@@ -17,8 +17,6 @@ pub(crate) mod cursor;
 
 use self::TokenKind::*;
 use cursor::Cursor;
-use lazy_static::lazy_static;
-use regex::Regex;
 
 #[cfg(test)]
 mod tests;
@@ -208,20 +206,16 @@ pub fn is_whitespace(c: char) -> bool {
 /// See [Antimony specification](https://antimony-lang.github.io/antimony/developers/specification.html#identifiers) for
 /// a formal definition of valid identifier name.
 pub fn is_id_start(c: char) -> bool {
-    lazy_static! {
-        static ref ID_START: Regex = Regex::new(r"[\pL_]").unwrap();
-    }
-    ID_START.is_match(&c.to_string())
+    // Valid identifier start is either an underscore or any Unicode letter
+    c == '_' || c.is_alphabetic()
 }
 
 /// True if `c` is a valid continuation of an identifier
 /// See [Antimony specification](https://antimony-lang.github.io/antimony/developers/specification.html#identifiers) for
 /// a formal definition of valid identifier name.
 pub fn is_id_continue(c: char) -> bool {
-    lazy_static! {
-        static ref ID_CONTINUE: Regex = Regex::new(r"[\pL\p{Nd}_]").unwrap();
-    }
-    ID_CONTINUE.is_match(&c.to_string())
+    // Valid identifier continuation is underscore, letter, or number
+    c == '_' || c.is_alphabetic() || c.is_numeric()
 }
 
 impl Cursor<'_> {

src/main.rs

@@ -1,6 +1,3 @@
-extern crate lazy_static;
-extern crate qbe;
-extern crate regex;
 /**
  * Copyright 2020 Garrit Franke
  *
@@ -16,6 +13,8 @@ extern crate regex;
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+extern crate lazy_static;
+extern crate qbe;
 extern crate rust_embed;
 extern crate structopt;