1 files changed, 25 insertions, 0 deletions
diff --git a/21sh/ll-expr/src/lexer/token.h b/21sh/ll-expr/src/lexer/token.h
new file mode 100644
index 0000000..b0866fc
--- /dev/null
+++ b/21sh/ll-expr/src/lexer/token.h
@@ -0,0 +1,25 @@
+#ifndef TOKEN_H
+#define TOKEN_H
+
+#include <unistd.h>
+
+enum token_type
+{
+    TOKEN_PLUS, // '+'
+    TOKEN_MINUS, // '-'
+    TOKEN_MUL, // '*'
+    TOKEN_DIV, // '/'
+    TOKEN_NUMBER, // "[0-9]+"
+    TOKEN_LEFT_PAR, // '('
+    TOKEN_RIGHT_PAR, // ')'
+    TOKEN_EOF, // end of input marker
+    TOKEN_ERROR // it is not a real token, it is returned in case of invalid
+                // input
+};
+
+struct token
+{
+    enum token_type type; // The kind of token
+    ssize_t value; // If the token is a number, its value
+};
+#endif /* !TOKEN_H */