Lex identifiers and keywords.

src/Parser/Lexer/Lexer.hpp

@@ -43,6 +43,9 @@ namespace ElohimScript::Parser {
         IntegerLiteral* LexBinary();
 
         StringLiteral* LexString(char8_t opening, bool heredoc);
+        LexToken* LexKeywordOrIdentifier();
+
+        static bool IsAlphaNumericalOrUnderscore(char8_t c);
     };
 }