1 files changed, 58 insertions, 0 deletions
diff --git a/src/lexer.h b/src/lexer.h
new file mode 100644
index 0000000..7c67028
--- /dev/null
+++ b/src/lexer.h
@@ -0,0 +1,58 @@
+#ifndef LEXER_H
+#define LEXER_H
+
+#include <stdio.h>
+
+#define TOKEN_TYPES(X)        \
+    X(TOKEN_LP)               \
+    X(TOKEN_RP)               \
+    X(TOKEN_ID)               \
+    X(TOKEN_STR)              \
+    X(TOKEN_INT)              \
+    X(TOKEN_DOT)              \
+    X(TOKEN_QUOTE)            \
+    X(TOKEN_UNQUOTE)          \
+    X(TOKEN_LAMBDA)           \
+    X(TOKEN_DEFINE)           \
+    X(TOKEN_QUOTE_FORM)       \
+    X(TOKEN_NONE)
+
+#define TO_ENUM(type) type,
+#define TO_STRING(type) #type,
+
+extern const char * const token_type_string[];
+
+struct token {
+    enum token_type {
+        TOKEN_TYPES(TO_ENUM)
+    } type;
+    
+    union {
+        char *id;
+        char *str;
+        int   num;
+    } value;
+};
+
+typedef struct lexer * lexer_t;
+#define LEXER_EMPTY NULL
+
+struct lexer {
+    FILE *fp;
+    size_t line;
+    
+    char str[256];
+    size_t str_idx;
+
+    struct token token;
+    char acc[256];
+    size_t acc_idx;
+};
+
+lexer_t lexer_create(FILE *fp);
+void lexer_destroy(lexer_t lexer);
+int lexer_token_next(lexer_t lexer, struct token *token);
+
+int token_value_string(struct token *token, size_t buf_sz, char *buf);
+
+#endif