1 files changed, 65 insertions, 0 deletions

diff --git a/lexer.h b/lexer.h
new file mode 100644
index 0000000..87fc008
--- /dev/null
+++ b/lexer.h
@@ -0,0 +1,65 @@
+#ifndef _LEXER
+#define _LEXER
+
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+#include "types.h"
+#include "memory.h"
+
+#define SYMBOL_NIL "nil"
+#define SYMBOL_TRUE_SHORT "#t"
+#define SYMBOL_TRUE "#true"
+#define SYMBOL_FALSE_SHORT "#f"
+#define SYMBOL_FALSE "#false"
+
+
+typedef enum _TokenType {
+        TOKEN_TYPE_SYMBOL,
+        TOKEN_TYPE_NUMBER,
+        TOKEN_TYPE_STRING,
+        TOKEN_TYPE_TRUE,
+        TOKEN_TYPE_FALSE,
+        TOKEN_TYPE_NIL,
+        TOKEN_TYPE_SPECIAL,
+        TOKEN_TYPE_ERROR
+} TokenType;
+
+
+typedef struct _Token {
+        TokenType type;
+        int is_decimal_point;
+        char *value;
+        struct _Token *next;
+} Token;
+
+typedef struct _Lexer {
+        int error;
+        Token *tokens;
+} Lexer;
+
+int lexer_tokens_count(char *str);
+
+Lexer *lexer_make();
+void lexer_free(Lexer *lexer);
+Token *lexer_token_make(char *value, int value_len, TokenType type);
+Lexer *lexer_token_push(Lexer *lexer, Token *token);
+
+char *lexer_token_terminated_symbol(char *str);
+char *lexer_token_make_string(char *str, Token **token);
+char *lexer_token_make_symbol(char *str, Token **token);
+char *lexer_token_make_special(char *str, Token **token);
+char *lexer_token_make_number(char *str, Token **token);
+
+void lexer_token_make_error(char *message, Token **token);
+
+Lexer *lexer_tokenize(char *str);
+
+
+void lexer_tokens_print(Lexer *lexer);
+Lexer *lexer_tokens_reverse(Lexer *lexer);
+
+#endif