1 files changed, 67 insertions, 0 deletions
diff --git a/igdbg.yacc.y b/igdbg.yacc.y
new file mode 100644
index 0000000..956c7e3
--- /dev/null
+++ b/igdbg.yacc.y
@@ -0,0 +1,67 @@
+%{
+#include <stdio.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+    
+int process_cmd(char *cmdhdr, int argc, ...);
+void yyerror(char *s);
+int yylex(void);
+int yyparse(void);
+int yywrap(void);
+    
+%}
+
+%union {
+    unsigned long expr;
+    char *string;
+}
+
+%token <string> CMDHDR0 CMDHDR1 CMDHDR2 CMDHDR3 CMDHDR4 CMDHDR5 CMDBEAGLE SUBCMD0 SUBCMD1 SUBCMD2 SUBCMD3 FILENAME CMDTOPAZ
+%token <expr> NUMBER 
+%token LSHIFT RSHIFT
+%left '-' '+'
+%left '*' '/'
+%nonassoc UMINUS
+
+%type <expr> expression
+
+%%
+
+command: CMDHDR0  { process_cmd($1,0); }
+| CMDHDR1 expression  { process_cmd($1,1,$2); }
+| CMDHDR2 expression expression  { process_cmd($1,2,$2,$3); }
+| CMDHDR3 expression expression expression { process_cmd($1,3,$2,$3,$4);}
+| CMDHDR4 expression expression expression expression { process_cmd($1,4,$2,$3,$4,$5);}
+| CMDHDR5 expression expression expression expression expression { process_cmd($1,4,$2,$3,$4,$5,$6);}
+
+expression: expression '+' expression {  $$ = $1 + $3; }
+| expression '-' expression {  $$ = $1 - $3; }
+| expression '*' expression {  $$ = $1 * $3; }
+| expression '/' expression {
+    if ($3 == 0.0) yyerror("divide by zero");
+    else $$ = $1 / $3;
+}
+| expression LSHIFT expression { $$ = $1 << $3; }
+| expression RSHIFT expression { $$ = $1 >> $3; }
+| '-' expression %prec UMINUS { $$ = -$2; }
+| '(' expression ')' { $$ = $2; }
+| NUMBER
+;
+
+%%
+
+void yyerror(char *s)
+{
+    fprintf(stderr,"%s\n",s);
+}
+
+int yywrap()
+{
+    return(1);
+}
+ 
+#ifdef __cplusplus
+}
+#endif