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  1. /* symexpr.l */
  2. %{
  3. #include<string.h>
  4. extern char* temp;
  5. extern int lexerror;
  6. int yyerror(char* errmsg);
  7. extern char* errmsg;
  8. %}
  9. %%
  10. [xyz,()]   { strcat(temp,yytext); return *yytext; }
  11. \n         { return *yytext; }
  12. [ \t]      { strcat(temp,yytext); } /* ignore whitespace */
  13. .          { strcat(temp,yytext);
  14.              sprintf(errmsg, "Invalid lexeme: '%c'.", *yytext);
  15.              yyerror(errmsg);
  16.              lexerror = 1; return *yytext; }
  17. %%
  18. int yywrap (void) {
  19.    return 1;
  20. }
  21.  
Success #stdin #stdout #stderr 0.03s 6848KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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ERROR: /home/pcoqRP/prog:3:1: Syntax error: Operator expected
ERROR: /home/pcoqRP/prog:20:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/yvmPjg
language:
Prolog (swi 7.6.4)
created:
1 hour ago
visibility:
public

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