pastebin

{

#include <stdio.h>

#include <string.h>

#include <ctype.h>

 

int shape_count;

}

 

letter [A-Z];

 

 

"triangle" { shape_count = 3; }

"square"   { shape_count = 4; }

"pentagon" { shape_count = 5; }

"hexagon"  { shape_count = 6; }

"heptagon" { shape_count = 7; }

"octagon"  { shape_count = 8; }

 

{letter}+ {

  int len = strlen(yytext);

  if (len != shape_count) {

    printf("Invalid definition: %s. ", yytext);

    return 1;

  }

 

  int symbol_count[26] = {0};

  for (int i = 0; i < len; i++) {

    int index = toupper(yytext[i]) - 'A';

    symbol_count[index]++;

    if (symbol_count[index] > 1) {

      printf("Invalid definition: %s. ", yytext);

      return 1;

    }

  }

}

 

 

int main(int argc, char** argv) {

  yylex();

  return 0;

}