/*
 * The function fsm_words() takes a string (text file) as an input
 * and it prints out parsed word.
 *
 * This is a demonstration of a concept that students can use for other
 * purposes.
 *
 * CSCI 363 demonstration
 * Spring 2014
 * Xiannong Meng
 */
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>  /* for u_int32_t etc. */
#include <ctype.h>      /* for isspace() etc. */
#include <string.h>

#define WS    0    /* white space */
#define WORD  1    /* word */
#define NUM   2    /* number */

u_int16_t STATES[] = {WS, WORD};
int wordCount = 0;   /* count of words */

/*
 * Assume text is a string of words separated by white spaces.
 * A word is defined as sequence of letters or digits. E.g.,
 * 'hello', '12how', '125' are all words. Anything
 * other than letters or digits will be considered as a delimiter.
 */
void word_fsm(char * text) {

  u_int16_t state = WS;
  char ch;
  int index = 0;
  int i = 0;
  int len = strlen(text);
  char * currentWord = (char*)malloc(len);

  while (index < len) {
    ch = text[index];
    switch (state) {
    case WS:
      if (!isspace(ch)) {
	if (isalnum(ch)) {
	  state = WORD;
	  wordCount ++;
	  currentWord[i] = ch;
	  i ++;
	}
      } /* if (!isspace(ch)) */
      break;
    case WORD:
      if (!isalnum(ch)) {
	currentWord[i] = 0;  /* terminate the string */
	i = 0;               /* reset the index within a word */
	printf("%s\n", currentWord);
	state = WS;
      } else { /* if (isspace(ch)) */
	currentWord[i] = ch;
	i ++;
      }
    } /* switch */
    index ++;
  } /* while */
  
} /* word_fsm() */

int main(int argc, char* argv[]) {
  
  /* usage: prog < input-text */
  int MAXLEN = 1024;  /* some arbitrary length */
  char text[MAXLEN + 1];
  int i = 0;

  while (i < MAXLEN && scanf("%c",&(text[i]))) {
    i ++;
  }

  text[i] = 0;    /* terminate the string */
  word_fsm(text); /* process the text */

  return 0;
}