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package otto
type _reference interface {
invalid() bool // IsUnresolvableReference
getValue() Value // getValue
putValue(Value) string // PutValue
delete() bool
}
// PropertyReference
type _propertyReference struct {
name string
strict bool
base *_object
runtime *_runtime
at _at
}
func newPropertyReference(rt *_runtime, base *_object, name string, strict bool, at _at) *_propertyReference {
return &_propertyReference{
runtime: rt,
name: name,
strict: strict,
base: base,
at: at,
}
}
func (self *_propertyReference) invalid() bool {
return self.base == nil
}
func (self *_propertyReference) getValue() Value {
if self.base == nil {
panic(self.runtime.panicReferenceError("'%s' is not defined", self.name, self.at))
}
return self.base.get(self.name)
}
func (self *_propertyReference) putValue(value Value) string {
if self.base == nil {
return self.name
}
self.base.put(self.name, value, self.strict)
return ""
}
func (self *_propertyReference) delete() bool {
if self.base == nil {
// TODO Throw an error if strict
return true
}
return self.base.delete(self.name, self.strict)
}
// ArgumentReference
func newArgumentReference(runtime *_runtime, base *_object, name string, strict bool, at _at) *_propertyReference {
if base == nil {
panic(hereBeDragons())
}
return newPropertyReference(runtime, base, name, strict, at)
}
type _stashReference struct {
name string
strict bool
base _stash
}
func (self *_stashReference) invalid() bool {
return false // The base (an environment) will never be nil
}
func (self *_stashReference) getValue() Value {
return self.base.getBinding(self.name, self.strict)
}
func (self *_stashReference) putValue(value Value) string {
self.base.setValue(self.name, value, self.strict)
return ""
}
func (self *_stashReference) delete() bool {
if self.base == nil {
// This should never be reached, but just in case
return false
}
return self.base.deleteBinding(self.name)
}
// getIdentifierReference
func getIdentifierReference(runtime *_runtime, stash _stash, name string, strict bool, at _at) _reference {
if stash == nil {
return newPropertyReference(runtime, nil, name, strict, at)
}
if stash.hasBinding(name) {
return stash.newReference(name, strict, at)
}
return getIdentifierReference(runtime, stash.outer(), name, strict, at)
}
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