Function AsFrame

interpreter/interpretable.go:199–210

AsFrame promotes an Activation to an ExecutionFrame.

(a Activation)

// AsFrame promotes an Activation to an ExecutionFrame.
func AsFrame(a Activation) *ExecutionFrame {
	if f, ok := a.(*ExecutionFrame); ok {
		return f
	}
	frame := &ExecutionFrame{Activation: a}
	// Walk the activation hierarchy to find a parent ExecutionFrame and inherit
	// its shared context.
	if parent := findFrame(a); parent != nil {
		frame.ctx = parent.ctx
	}
	return frame
}

// findFrame walks the activation hierarchy via Unwrap and Parent to locate an
// existing ExecutionFrame, if one exists.