func (qs *queryShape) MakeNode(it graph.Iterator) *Node {
n := Node{Id: qs.nodeId}
for _, tag := range it.Tags() {
n.Tags = append(n.Tags, tag)
}
for k, _ := range it.FixedTags() {
n.Tags = append(n.Tags, k)
}
switch it.Type() {
case "and":
for _, sub := range it.GetSubIterators() {
qs.nodeId++
newNode := qs.MakeNode(sub)
if sub.Type() != "or" {
qs.StealNode(&n, newNode)
} else {
qs.AddNode(newNode)
qs.AddLink(&Link{n.Id, newNode.Id, 0, 0})
}
}
case "fixed":
n.IsFixed = true
for {
val, more := it.Next()
if !more {
break
}
n.Values = append(n.Values, qs.ts.GetNameFor(val))
}
case "hasa":
hasa := it.(*HasA)
qs.PushHasa(n.Id, hasa.dir)
qs.nodeId++
newNode := qs.MakeNode(hasa.primaryIt)
qs.AddNode(newNode)
qs.RemoveHasa()
case "or":
for _, sub := range it.GetSubIterators() {
qs.nodeId++
newNode := qs.MakeNode(sub)
if sub.Type() == "or" {
qs.StealNode(&n, newNode)
} else {
qs.AddNode(newNode)
qs.AddLink(&Link{n.Id, newNode.Id, 0, 0})
}
}
case "linksto":
n.IsLinkNode = true
lto := it.(*LinksTo)
qs.nodeId++
newNode := qs.MakeNode(lto.primaryIt)
hasaID, hasaDir := qs.LastHasa()
if (hasaDir == graph.Subject && lto.dir == graph.Object) ||
(hasaDir == graph.Object && lto.dir == graph.Subject) {
qs.AddNode(newNode)
if hasaDir == graph.Subject {
qs.AddLink(&Link{hasaID, newNode.Id, 0, n.Id})
} else {
qs.AddLink(&Link{newNode.Id, hasaID, 0, n.Id})
}
} else if lto.primaryIt.Type() == "fixed" {
qs.StealNode(&n, newNode)
} else {
qs.AddNode(newNode)
}
case "optional":
// Unsupported, for the moment
fallthrough
case "all":
}
return &n
}