external/bsd/flex/dist/examples/manual/yymore2.lex

   1 /*
   2  * yymore.lex: An example of using yymore()
   3  *             to good effect.
   4  */
   5
   6 %{
   7 #include <memory.h>
   8
   9 void yyerror(char *message)
  10 {
  11   printf("Error: %s\n",message);
  12 }
  13
  14 %}
  15
  16 %x STRING
  17
  18 %%
  19 \"   BEGIN(STRING);
  20
  21 <STRING>[^\\\n"]*  yymore();
  22 <STRING><<EOF>>    yyerror("EOF in string.");       BEGIN(INITIAL);
  23 <STRING>\n         yyerror("Unterminated string."); BEGIN(INITIAL);
  24 <STRING>\\\n      {
  25                      bcopy(yytext,yytext+2,yyleng-2);
  26                      yytext += 2; yyleng -= 2;
  27                      yymore();
  28                   }
  29 <STRING>\"        {
  30                      yyleng -= 1; yytext[yyleng] = '\0';
  31                      printf("string = \"%s\"",yytext); BEGIN(INITIAL);
  32                   }
  33 %%