Add the ability to parse types.

This ability is not integrated with the rest of the parser - in fact, the grammar for things like function declarations (where type declarations are necessary) is not yet determined.

include/lexer.h

@@ -62,6 +62,7 @@ enum libab_lexer_token_e {
     TOKEN_KW_ELSE,
     TOKEN_KW_WHILE,
     TOKEN_KW_DO,
+    TOKEN_KW_ARROW,
     TOKEN_LAST
 };
 

include/parser.h

@@ -4,6 +4,7 @@
 #include "table.h"
 #include "ll.h"
 #include "tree.h"
+#include "parsetype.h"
 
 /**
  * The parser that is used by libabacus
@@ -31,6 +32,8 @@ void libab_parser_init(libab_parser* parser, libab_table* table);
  */
 libab_result libab_parser_parse(libab_parser* parser, ll* tokens,
         const char* string, libab_tree** store_into);
+libab_result libab_parser_parse_type(libab_parser* parser, ll* tokens,
+        const char* string, libab_parsetype** store_into);
 /**
  * Releases the resources allocated by the parser.
  * @param parser the parser to release.