/* FIRST(assignment expression)={AVID ,SVID}
<assignment expression> ->
AVID = <arithmetic expression>
| SVID = <string expression>
Author: Kwok Hong Kelvin Chan */
void assignment_expression(void){
switch(lookahead_token.code){
case AVID_T:
match(AVID_T, NO_ATTR);
match(ASS_OP_T, NO_ATTR);
arithmetic_expression();
gen_incode("Assignment expression (arithmetic) parsed");
break;
case SVID_T:
match(SVID_T, NO_ATTR);
match(ASS_OP_T, NO_ATTR);
string_expression();
gen_incode("Assignment expression (string) parsed");
break;
default:
syn_printe();
break;
}
}
/*
* Production: Primary Arithmetic Expression
* FIRST set: { AVID_T, FPL_T, INL_T, ( }
*/
void primary_arithmetic_expression(void) {
switch (lookahead.code) {
case AVID_T:
case FPL_T:
case INL_T:
match(lookahead.code, lookahead.attribute.rel_op);
break;
case LPR_T:
match(LPR_T, lookahead.attribute.arr_op);
arithmetic_expression();
match(RPR_T, NO_ATTR);
break;
/* If nothing matches, print an error. */
default:
syn_printe();
break;
}
gen_incode("PLATY: Primary arithmetic expression parsed");
}
/*
* Production: Assignment Expression
* FIRST set: { AVID, SVID }
*/
void assignment_expression(void) {
switch (lookahead.code) {
case AVID_T:
match(AVID_T, NO_ATTR);
match(ASS_OP_T, NO_ATTR);
arithmetic_expression();
gen_incode("PLATY: Assignment expression (arithmetic) parsed");
return;
case SVID_T:
match(SVID_T, NO_ATTR);
match(ASS_OP_T, NO_ATTR);
string_expression();
gen_incode("PLATY: Assignment expression (string) parsed");
return;
/* If the current token code is not AVID or SVID, print an error. */
default:
syn_printe();
return;
}
}
/* FIRST(primary arithmetic expression)={AVID_T, FPL_T ,INL_T ,(}
<primary arithmetic expression> ->
AVID_T
| FPL_T
| INL_T
| (<arithmetic expression>)
Author: Kwok Hong Kelvin Chan */
void primary_arithmetic_expression(void){
switch(lookahead_token.code){
case LPR_T:
match(LPR_T, NO_ATTR);
arithmetic_expression();
match(RPR_T, NO_ATTR);
break;
case AVID_T:
match(AVID_T, NO_ATTR);
break;
case FPL_T:
match(FPL_T, NO_ATTR);
break;
case INL_T:
match(INL_T, NO_ATTR);
break;
default:
syn_printe();
break;
}
gen_incode("Primary arithmetic expression parsed");
}