visitTensor method
Implementation
@override
String visitTensor(TensorNode node) {
final base = visit(node.base);
final indices = node.indices
.map((pair) {
final isUpper = pair.$1;
final indexNode = pair.$2;
final prefix = isUpper ? "upper" : "lower";
return "$prefix ${visit(indexNode)}";
})
.join(" ");
return "$base $indices";
}