refactor(lexer, ast): Rewrite decl with c standard grammar of decl

src/lexer/lexer.rs

@@ -1,4 +1,4 @@
-use std::str::FromStr;
+use std::{str::FromStr, sync::LazyLock};
 
 use thiserror::Error;
 
@@ -330,6 +330,17 @@ fn parse_puncuation(
     Ok(token_value)
 }
 
+// static KEYWORDS: LazyLock<HashMap<&'static str, TokenValue>> = LazyLock::new(|| {
+//     let mut m = HashMap::new();
+//     m.insert("if", TokenValue::If);
+//     m.insert("else", TokenValue::Else);
+//     m.insert("while", TokenValue::While);
+//     m.insert("for", TokenValue::For);
+//     m.insert("return", TokenValue::Return);
+//     m.insert("break", TokenValue::Break);
+//     m.insert("continue", TokenValue::Continue);
+//     m
+// });
 fn parse_ident(
     str_iter: &mut Cursor,
 ) -> Result<TokenValue, LexParseError> {
@@ -370,6 +381,9 @@ fn parse_ident(
     if name.eq("continue") {
         return Ok(TokenValue::Continue);
     }
+    if name.eq("static") {
+        return Ok(TokenValue::Static);
+    }
     if let Some(type_ident) = TypeIdent::from_str(&name).ok() {
         return Ok(TokenValue::TypeIdent(type_ident));
     }