1 files changed, 30 insertions, 0 deletions
diff --git a/lex.h b/lex.h
new file mode 100644
index 0000000..a14528f
--- /dev/null
+++ b/lex.h
@@ -0,0 +1,30 @@
+#ifndef LEX_H
+#define LEX_H
+
+#include <stdio.h>
+
+enum TOKEN_TYPE {
+	TOKEN_COMMA = 1,
+	TOKEN_DOT, /* starts an assembler directive */
+	TOKEN_LABEL, /* label declaration */
+	TOKEN_IDENT, /* identifier (not label decl) or instruction */
+	TOKEN_KEYWORD, /* keyword used to tell the assembler special information */
+	TOKEN_STRING, /* string literal */
+	TOKEN_NUMERIC, /* numeric literal, incl literal chars */
+	TOKEN_REGISTER, /* $0, $H, $1 */
+	TOKEN_EOL /* end of line */
+};
+
+struct token {
+	enum TOKEN_TYPE type;
+	/* line and column of the source file this token occurs at. 1-based. */
+	size_t line;
+	size_t column;
+	size_t span;
+	char *s_val;
+	int i_val;
+};
+
+struct token* lex(const char *filename_local, FILE *fin, size_t *len);
+
+#endif /* LEX_H */