From 54d43f3260baaad25f5598ff876799711fe109ea Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Thu, 9 Jul 2015 07:15:10 -0700
Subject: Parser cleanup: embed scanner in parser.

* parser.c (parser_destroy): New GC finalizer static function.
(parser_ops): Register parser_destroy.
(parser_common_init): New function, shared by parse and parse_once.
Initializes embedded scanner.
(parser_cleanup): New function, shared by parse_once and
parser_destroy.
(parser): Use parser_common_init.

* parser.h (parser_t): New member, yyscan.
(reset_scanner, parser_common_init): Declared.

* parser.l (reset_scanner): New function.

* parser.y (parse_once): Use parser_common_init, and
thus perform only a few initializations. Do not
define scanner as a local variable.
(parse): Call reset_scanner instead of
yylex_init since the scanner is being reused,
and for the same reason do not call yylex_destroy.
GC will do that now.
---
 parser.h | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

(limited to 'parser.h')

diff --git a/parser.h b/parser.h
index e6f531f2..0db10d4e 100644
--- a/parser.h
+++ b/parser.h
@@ -26,6 +26,11 @@
 
 typedef struct yyguts_t scanner_t;
 
+#ifndef YY_TYPEDEF_YY_SCANNER_T
+#define YY_TYPEDEF_YY_SCANNER_T
+typedef void *yyscan_t;
+#endif
+
 typedef struct {
   val parser;
   cnum lineno;
@@ -35,14 +40,10 @@ typedef struct {
   val prepared_msg;
   val syntax_tree;
   val primer;
+  yyscan_t yyscan;
   scanner_t *scanner;
 } parser_t;
 
-#ifndef YY_TYPEDEF_YY_SCANNER_T
-#define YY_TYPEDEF_YY_SCANNER_T
-typedef void *yyscan_t;
-#endif
-
 extern const wchar_t *spec_file;
 extern val form_to_ln_hash;
 extern val parser_s;
@@ -52,6 +53,7 @@ void yyerrorf(scanner_t *scanner, val s, ...);
 void yybadtoken(parser_t *, int tok, val context);
 void end_of_regex(scanner_t *scanner);
 void end_of_char(scanner_t *scanner);
+void reset_scanner(scanner_t *scanner);
 int yylex_init(yyscan_t *pscanner);
 int yylex_destroy(yyscan_t scanner);
 parser_t *yyget_extra(yyscan_t scanner);
@@ -72,6 +74,8 @@ val rlcp_tree(val to, val from);
 val regex_parse(val string, val error_stream);
 val lisp_parse(val source, val error_stream, val error_return_val, val name);
 val read_eval_stream(val stream, val error_stream, val hash_bang_support);
+void parser_common_init(parser_t *);
+void parser_cleanup(parser_t *);
 val parser(val stream, val lineno, val primer);
 val get_parser(val stream);
 val parser_errors(val parser);
-- 
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