/** Implementation of a JavaScript Scope */
class ScopeImpl extends JS.Obj {
private JS.Scope parentScope;
- private static Object NULL = new Object();
+ private static Object NULL_PLACEHOLDER = new Object();
public ScopeImpl(JS.Scope parentScope, boolean sealed) {
super(sealed);
if (parentScope == this) throw new Error("can't make a scope its own parent!");
// we use _get instead of get solely to work around a GCJ bug
public Object _get(Object key) {
if (!has(key)) return parentScope == null ? null : parentScope.get(key);
- Object ret = super.get(key); return ret == NULL ? null : ret;
+ Object ret = super.get(key); return ret == NULL_PLACEHOLDER ? null : ret;
}
// we use _put instead of put solely to work around a GCJ bug
public void _put(Object key, Object val) {
if (!has(key) && parentScope != null) parentScope.put(key, val);
- else super.put(key, val == null ? NULL : val);
+ else super.put(key, val == null ? NULL_PLACEHOLDER : val);
}
public boolean isTransparent() { return false; }
public void declare(String s) {
if (isTransparent()) parentScope.declare(s);
- else super.put(s, NULL);
+ else super.put(s, NULL_PLACEHOLDER);
}
}