int main(int argc, char* argv[]){
//test command line arguments
if(argc != 2){
printf("insufficent command line arguments");
exit(0);
}
//open the file
FILE* input = fopen(argv[1],"r");
if(input == NULL){
printf("File not found\n");
exit(0);
}
char equation[MAX_EQU_LEN] = {0}; // initilize the array
while(fscanf(input,"%s",equation) != EOF){
printf("For equation %s; %s : %s\n",equation,paren_match(equation)?"Parensmatch":"Parens do not match",paren_and_brackets_match(equation)?"Bonus Brackets match":"Bonus Brackets do not match");
equation[0] = '\0'; //reset the array
}
close(input); //close the file
return 0;
}
/* Takes a pointer to an opening parenthetical.
* Returns a pointer AFTER the matching delimiter, or NULL if not found.
*/
const char *paren_match (const char *open, step_t step) {
const char *s = (*step)(open, 1);
while (*s) {
switch (*s) {
case '#':
s = comment_match(s, step);
if (s) {
break;
} else return NULL;
case '(':
case '{':
case '[':
s = paren_match(s, step);
if (s) {
break;
} else return NULL;
case ']':
if (*open == '[') return (*step)(s,1); else return NULL;
case '}':
if (*open == '{') return (*step)(s,1); else return NULL;
case ')':
if (*open == '(') {
return (*step)(s,1);
} else return NULL;
case '"':
case '\'':
case '%':
case '`':
s = quoted_match(s, step);
if (s) {
break;
} else return NULL;
default:
s = (*step)(s, 1);
}
}
return NULL;
}
/* Go forward one symbol, balanced subexpression, or other char.
* Return NULL if imbalanced. */
const char *forward_balanced(const char *str, step_t step) {
switch (*str) {
case 0:
return NULL;
case '(':
case '{':
case '[':
return paren_match(str, step);
case ')':
case '}':
case ']':
return NULL;
case '"':
case '\'':
case '%':
case '`':
return quoted_match(str, step);
case '#':
return comment_match(str, step);
default:
return forward_word_or_char(str, step);
}
}
