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blank ident is no ident

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This commit is contained in:
Josh Deprez 2021-09-16 10:34:54 +10:00
parent 60d5df92d0
commit 97c5939483
2 changed files with 15 additions and 13 deletions
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19
engine/game.go
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@ -330,12 +330,13 @@ func (g *Game) Register(component, parent interface{}) error {
func (g *Game) register(component, parent interface{}) error {
// register in g.byID if needed
if i, ok := component.(Identifier); ok {
id := i.Ident()
if id := i.Ident(); id != "" {
if _, exists := g.byID[id]; exists {
return fmt.Errorf("duplicate id %q", id)
}
g.byID[id] = i
}
}
// register in g.par
if parent != nil {
@ -360,11 +361,11 @@ func (g *Game) register(component, parent interface{}) error {
}
// TODO: better than O(len(path)^2) time and memory?
for p := component; p != nil; p = g.par[p] {
i, ok := p.(Identifier)
if !ok {
id, ok := p.(Identifier)
if !ok || id.Ident() == "" {
continue
}
k := abKey{i.Ident(), b}
k := abKey{id.Ident(), b}
if g.byAB[k] == nil {
g.byAB[k] = make(map[interface{}]struct{})
}
@ -397,11 +398,11 @@ func (g *Game) unregister(component interface{}) {
continue
}
for p := component; p != nil; p = g.par[p] {
i, ok := p.(Identifier)
if !ok {
id, ok := p.(Identifier)
if !ok || id.Ident() == "" {
continue
}
k := abKey{i.Ident(), b}
k := abKey{id.Ident(), b}
if g.byAB[k] == nil {
continue
}
@ -421,8 +422,8 @@ func (g *Game) unregister(component interface{}) {
}
// unregister from g.byID if needed
if i, ok := component.(Identifier); ok {
delete(g.byID, i.Ident())
if id, ok := component.(Identifier); ok && id.Ident() != "" {
delete(g.byID, id.Ident())
}
}

3
engine/interface.go
View file

@ -84,7 +84,8 @@ type Hider interface {
}
// Identifier components have a sense of self. This makes it easier for
// components to find and interact with one another.
// components to find and interact with one another. Returning the empty string
// is treated as having no identifier.
type Identifier interface {
Ident() string
}