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main_suppl_funs.c
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main_suppl_funs.c
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#include "main_suppl_funs.h"
void init_info(get_info *info) {
info->inp_base = 10;
info->out_base = 10;
info->unary_neg = 0;
info->r_ass = 0;
info->prev_token = 0;
/*To handle first unary negative sign*/
info->token = '+';
info->next_token = 0;
return;
}
int precedence(char c) {
switch(c) {
case '(':
return 5;
case '+':
return 10;
case '-':
return 10;
case '*':
return 20;
case '/':
return 20;
case '%':
return 20;
case '^':
return 30;
case 'L':
return 40;
case 'H':
return 40;
default:
return 0;
}
}
void error(char prev, char next) {
printf("Syntax Error\n");
printf("TYPE: wrong operator '%c', after '%c'.\n", next, prev);
cont = 1;
//exit(1);
}
int isOperator(char c) {
switch(c) {
case '+':
return 1;
case '-':
return 1;
case '*':
return 1;
case '/':
return 1;
case '%':
return 1;
case '^':
return 1;
case 'L':
return 1;
case 'H':
return 1;
default:
return 0;
}
}
Big_N eval(Big_N *op1, Big_N *op2, char operan) {
switch(operan){
case('+'):
return add(op1, op2);
case('-'):
return sub(op1, op2);
case('*'):
return mult(op1, op2);
case('/'):
return division(op1, op2);
case('%'):
return modulo(op1, op2);
case('^'):
return power(*op1, *op2);
case('L' ):
return lcm(op1, op2);
case('H'):
return gcd(*op1, *op2);
}
}
int get_token(get_info *info, list *inp) {
info->prev_token = info->token;
for( ; touch(*inp) != '\0' && touch(*inp) == ' '; get_next(inp));
info->token = get_next(inp);
for( ; touch(*inp) != '\0' && touch(*inp) == ' '; get_next(inp));
info->next_token = touch(*inp);
return 0;
}
void handle_tokens(get_info *info, list *inp, Big_stack *val) {
switch(info->token) {
case '/':
if(isOperator(info->prev_token))
error(info->prev_token, info->token);
break;
case '*':
if(isOperator(info->prev_token))
error(info->prev_token, info->token);
break;
case 'L':
if(isOperator(info->prev_token))
error(info->prev_token, info->token);
break;
case 'H':
if(isOperator(info->prev_token))
error(info->prev_token, info->token);
break;
case '^':
if(isOperator(info->prev_token))
error(info->prev_token, info->token);
break;
case '-':
if(isOperator(info->prev_token) && isdigit(info->next_token)) {
info->unary_neg = 1;
info->token = info->next_token;
info->next_token = get_token(info, inp);
}
else if(isOperator(info->prev_token) && isOperator(info->next_token))
error(info->prev_token, info->token);
break;
case '+':
if(isOperator(info->prev_token) && isdigit(info->next_token)) {
info->token = info->next_token;
info->next_token = get_token(info, inp);
}
else if(isOperator(info->prev_token) && isOperator(info->next_token))
error(info->prev_token, info->token);
break;
case '\0':
if(isOperator(info->prev_token)) {
printf("Syntax Error.\n");
printf("TYPE: Unterminated operator '%c'\n", info->prev_token);
cont = 1;
return;
}
break;
case '!': {
if(isOperator(info->prev_token))
error(info->prev_token, info->token);
Big_N hcf = pop_Big_N(val);
push_Big_N(val, fact(&hcf));
info->token = info->next_token;
info->next_token = get_token(info, inp);
break;
}
case '<':
{
char tmp;
/*prev token should be operator if not-error*/
if(! isOperator(tmp = info->prev_token))
error(info->prev_token, info->token);
get_token(info, inp);
if(info->token != 'I') {
printf("Syntax Error");
printf("TYPE: 'I' is necessry after '<' \n");
cont = 0;
return;
}
/*to remove '<' token*/
get_token(info, inp);
if(isdigit(info->token))
info->inp_base = info->token - '0';
get_token(info, inp);
/*if input base is 2 digit no*/
if(isdigit(info->token)){
info->inp_base = (info->inp_base)*10 + (info->token - '0');
get_token(info, inp);
}
/*to remove '>' token*/
if(info->token == '>')
get_token(info, inp);
else {
printf("Syntax Error");
printf("TYPE: '>' is necessry after '<' \n");
cont = 0;
return;
}
list M;
init(&M);
while(isdigit(info->token) || (info->token >= 'A' && info->token <='Z')) {
insert_beg(&M, info->token);
get_token(info, inp);
}
push_Big_N(val, toDeci(&M, info->inp_base));
info->prev_token = tmp;
break;
}
}
return;
}