Add the drafts of the two posts

code/compiler_scanner.l

@@ -0,0 +1,33 @@
+%option noyywrap
+
+%{
+#include <iostream>
+%}
+
+%%
+
+[ \n]+ {}
+\+ { std::cout << "PLUS" << std::endl; }
+\* { std::cout << "TIMES" << std::endl; }
+- { std::cout << "MINUS" << std::endl; }
+\/ { std::cout << "DIVIDE" << std::endl; }
+[0-9]+ { std::cout << "NUMBER: " << yytext << std::endl; }
+defn { std::cout << "KEYWORD: defn" << std::endl; }
+data { std::cout << "KEYWORD: data" << std::endl; }
+case { std::cout << "KEYWORD: case" << std::endl; }
+of { std::cout << "KEYWORD: of" << std::endl; }
+\{ { std::cout << "OPEN CURLY" << std::endl; }
+\} { std::cout << "CLOSED CURLY" << std::endl; }
+\( { std::cout << "OPEN PARENTH" << std::endl; }
+\) { std::cout << "CLOSE PARENTH" << std::endl; }
+,  { std::cout << "COMMA" << std::endl; }
+-> { std::cout << "PATTERN ARROW" << std::endl; }
+= { std::cout << "EQUAL" << std::endl; }
+[a-z][a-zA-Z]* { std::cout << "LOWERCASE IDENTIFIER: " << yytext << std::endl; }
+[A-Z][a-zA-Z]* { std::cout << "UPPERCASE IDENTIFIER: " << yytext << std::endl; }
+
+%%
+
+int main() {
+    yylex();
+}