Method autoRender

display.go:254–288

detect and render data types that should be auto-rendered graphically

(mimeType string, arg interface{}, typ xreflect.Type)

// detect and render data types that should be auto-rendered graphically
func (kernel *Kernel) autoRender(mimeType string, arg interface{}, typ xreflect.Type) Data {
	var data Data
	// try Data
	if x, ok := arg.(Data); ok {
		data = x
	}

	if kernel == nil || typ == nil {
		// try all autoRenderers
		for _, fun := range autoRenderers {
			data = fun(data, arg)
		}
	} else {
		// in gomacro, methods of interpreted types are emulated.
		// Thus type-asserting them to interface types as done by autoRenderer functions above cannot succeed.
		// Manually check if emulated type "pretends" to implement one or more of the above interfaces
		// and, in case, tell the interpreter to convert to them
		for name, xtyp := range kernel.render {
			fun := autoRenderers[name]
			if fun == nil || !typ.Implements(xtyp) {
				continue
			}
			conv := kernel.ir.Comp.Converter(typ, xtyp)
			x := arg
			if conv != nil {
				x = basereflect.ValueInterface(conv(xreflect.ValueOf(x)))
				if x == nil {
					continue
				}
			}
			data = fun(data, x)
		}
	}
	return fillDefaults(data, arg, "", nil, "", nil)
}

func fillDefaults(data Data, arg interface{}, s string, b []byte, mimeType string, err error) Data {
	if err != nil {