TreeNode * factor(void)
{ TreeNode * t = NULL;
switch (token) {
case NUM :
t = newExpNode(ConstK);
if ((t!=NULL) && (token==NUM))
t->attr.val = atoi(tokenString);
match(NUM);
break;
case ID :
t = newExpNode(IdK);
if ((t!=NULL) && (token==ID))
t->attr.name = copyString(tokenString);
match(ID);
break;
case LPAREN :
match(LPAREN);
t = expres();
match(RPAREN);
break;
default:
syntaxError("unexpected token -> ");
printToken(token,tokenString);
token = getToken();
break;
}
return t;
}
TreeNode * repeat_stmt(void)
{ TreeNode * t = newStmtNode(RepeatK);
match(REPEAT);
if (t!=NULL) t->child[0] = stmt_sequence();
match(UNTIL);
if (t!=NULL) t->child[1] = expres();
return t;
}
TreeNode * assign_stmt(void)
{ TreeNode * t = newStmtNode(AssignK);
if ((t!=NULL) && (token==ID))
t->attr.name = copyString(tokenString);
match(ID);
match(ASSIGN);
if (t!=NULL) t->child[0] = expres();
return t;
}
TreeNode * if_stmt(void)
{ TreeNode * t = newStmtNode(IfK);
match(IF);
if (t!=NULL) t->child[0] = expres();
match(THEN);
if (t!=NULL) t->child[1] = stmt_sequence();
if (token==ELSE) {
match(ELSE);
if (t!=NULL) t->child[2] = stmt_sequence();
}
match(ENDIF);
return t;
}
TreeNode * for_stmt(void)
{
TreeNode * t = newStmtNode(ForK);
TreeNode * temp ;
TreeNode * ultimoIrmao ;
match(FOR);
switch(token){
case LPAREN:
match(LPAREN);
if (t!= NULL) t->child[0] = assign_stmt();
match(COMMA);
if (t!= NULL) t->child[1] = expres();
match(COMMA);
if (temp!= NULL) temp = assign_stmt();
match(RPAREN);
if (t!= NULL) t->child[2] = stmt_sequence();
if (t->child[2] != NULL){ //Se o terceiro filho tiver algo,
if(t->child[2]->sibling != NULL){ //Se o nó tem irmão, vamos fazer um loop para chegar até o ultimo irmão.
ultimoIrmao = t->child[2]->sibling;
while ( ultimoIrmao->sibling != NULL){ //Loop para chegar em ultimo irmão
ultimoIrmao = ultimoIrmao->sibling;
}
ultimoIrmao->sibling = temp;
}
else {
t->child[2]->sibling = temp;
}
}
else{ //Se o que tem dentro do FOR for nada, então vamos só fazer as iterações
t->child[2] = temp;
}
match(ENDFOR);
break;
default:
syntaxError("unexpected token -> ");
printToken(token,tokenString);
token = getToken();
break;
}
return t;
}
TreeNode * write_stmt(void)
{ TreeNode * t = newStmtNode(WriteK);
match(WRITE);
if (t!=NULL) t->child[0] = expres();
return t;
}
PUBLIC void absexpres()
{
expres();
chkabs();
}
