DIRECTOR: Added stub parser. Now just arithmetic expressions.

1 files changed, 72 insertions, 0 deletions

diff --git a/engines/director/lingo/lingo-gr.y b/engines/director/lingo/lingo-gr.y
new file mode 100644
index 0000000000..49149cbfba
--- /dev/null
+++ b/engines/director/lingo/lingo-gr.y
@@ -0,0 +1,72 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+%{
+#include "common/hash-str.h"
+
+#include "director/lingo/lingo.h"
+#include "director/lingo/lingo-gr.h"
+
+Common::HashMap<Common::String, int, Common::IgnoreCase_Hash, Common::IgnoreCase_EqualTo> vars;
+
+extern int yylex();
+extern int yyparse();
+void yyerror(char *s) { error("%s", s); }
+
+%}
+
+%union { int i; Common::String *s; }
+
+%token UNARY
+%token<i> INT
+%token<s> VAR
+%type<i> expr
+
+%right '='
+%left '+' '-'
+%left '*' '/' '%'
+%right UNARY
+
+%%
+
+list: statement
+    | list statement
+    ;
+
+statement: expr ','
+    | expr ':'          { warning("%d", $1); }
+    ;
+
+expr: INT               { $$ = $1; }
+    | VAR               { $$ = vars[*$1];      delete $1; }
+    | VAR '=' expr      { $$ = vars[*$1] = $3; delete $1; }
+    | expr '+' expr     { $$ = $1 + $3; }
+    | expr '-' expr     { $$ = $1 - $3; }
+    | expr '*' expr     { $$ = $1 * $3; }
+    | expr '/' expr     { $$ = $1 / $3; }
+    | expr '%' expr     { $$ = $1 % $3; }
+    | '+' expr  %prec UNARY    { $$ =  $2; }
+    | '-' expr  %prec UNARY    { $$ = -$2; }
+    | '(' expr ')'             { $$ =  $2; }
+    ;
+
+%%