/**
* Evaluates the expression.
*
* @param env the calling environment.
* @return the expression value.
*/
@Override
public Value evalCopy(Env env) {
Value obj = env.getThis();
if (obj.isNull()) {
return cannotUseThisError(env);
}
return obj.getThisField(env, _name).copy();
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
* @return the expression value.
*/
@Override
public void evalUnset(Env env) {
Value obj = env.getThis();
if (obj.isNull()) {
cannotUseThisError(env);
}
obj.unsetThisField(_name);
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
* @return the expression value.
*/
@Override
public Value evalArg(Env env, boolean isTop) {
Value obj = env.getThis();
if (obj.isNull()) {
return cannotUseThisError(env);
}
return obj.getThisFieldArg(env, _name);
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
* @return the expression value.
*/
@Override
public Value evalAssignRef(Env env, Value value) {
Value obj = env.getThis();
if (obj.isNull()) {
cannotUseThisError(env);
}
obj.putThisField(env, _name, value);
return value;
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
* @return the expression value.
*/
@Override
public Var evalVar(Env env) {
Value obj = env.getThis();
if (obj.isNull()) {
cannotUseThisError(env);
return new Var();
}
return obj.getThisFieldVar(env, _name);
}
/** Evaluates as an array index assign ($a[index] = value). */
@Override
public Value evalArrayAssign(Env env, Value index, Value value) {
Value obj = env.getThis();
if (obj.isNull()) {
cannotUseThisError(env);
}
Value fieldVar = obj.getThisFieldVar(env, _name);
// php/03mm
return fieldVar.put(index, value);
}