support escaped identifiers starting with ~ in vqm2blif

Author: kimiatkh

libs/libvqm/vqm_parser.l

@@ -40,7 +40,7 @@
 ^[ \t]*\/\/[^\n\r]*(\n|\r\n)                /* skip one-line comments */
 ^[ \t]*\(\*[^\n\r]*\*\)                     /* skip synthesis attributes and directives */
 [ \t]+                                      /* skip white spaces */
-(!|~)				    /* skip the logical operator ! applied on the input ports of the lut - this results in lut mask not being valid anoymore */
+!				    /* skip the logical operator ! applied on the input ports of the lut - this results in lut mask not being valid anoymore */
 (\n|\r\n)                                   /* skip empty lines */
 module                                      return TOKEN_MODULE;
 endmodule                                   return TOKEN_ENDMODULE;
@@ -67,6 +67,11 @@ assign                                      return TOKEN_ASSIGN;
                                                 strcpy(yylval.string, yytext+1);
                                                 return TOKEN_ESCAPEDID;
                                             }
+~\\[^ ^\t^;]+                               {
+                                                yylval.string = (char *)malloc(yyleng - 1);
+                                                strcpy(yylval.string, yytext+2);
+                                                return TOKEN_ESCAPEDID;
+                                            }
 \"[^\"]*\"                                  {
                                                 yylval.string = (char *)malloc(yyleng-1);
                                                 strncpy(yylval.string, yytext+1, yyleng-2);