int numChilds = cursor.getNumChilds();

std::optional<std::string> primitiveType = std::nullopt;

optional<unique_ptr<Expr>> expr = std::nullopt;

string identifier;

if (cursor.getNumChilds() == 1) {

throw invalid_argument("cannot declare auto variable with empty value");

}

vector<unique_ptr<Expr>> exprs;

// get primitive type

cursor.goToChild();

if (cursor.getType() == "primitive_type") {

primitiveType = cursor.getSourceStr();

cursor.goToSibling();

// get identifier

assert(cursor.getType() == "identifier");

identifier = cursor.getSourceStr();

if (numChilds > 2) {

// get next char

cursor.goToSibling(true);

if (cursor.getSourceStr() == "=") { // normal var decl

cursor.goToSibling(true);

assert(cursor.getType() == "expression");

expr = ParseExpression();

} else { // ohh is a class decl

cursor.goToSibling(true);

while (true) {

auto ex = ParseExpression();

cursor.goToSibling(true);

exprs.push_back(move(ex));

if (cursor.getSourceStr() == ",") cursor.goToSibling(true);

else break;

}

}

}

}

else {

assert(cursor.getType() == "identifier");

identifier = cursor.getSourceStr();

cursor.goToSibling();

assert(cursor.getType() == "expression");

expr = ParseExpression();

}

// go back to the var decl expr

cursor.goToParent();

return make_unique<VarDeclareExpr>(VarMutability::VAR_MUTABILITY_VAR, identifier, move(expr), primitiveType, move(exprs));

}