Function newValuesSorter

internal/spew/common.go:228–251

newValuesSorter initializes a valuesSorter instance, which holds a set of surrogate keys on which the data should be sorted. It uses flags in ConfigState to decide if and how to populate those surrogate keys.

(values []reflect.Value, cs *ConfigState)

// surrogate keys on which the data should be sorted.  It uses flags in
// ConfigState to decide if and how to populate those surrogate keys.
func newValuesSorter(values []reflect.Value, cs *ConfigState) sort.Interface {
	vs := &valuesSorter{values: values, cs: cs}
	if canSortSimply(vs.values[0].Kind()) {
		return vs
	}
	if !cs.DisableMethods {
		vs.strings = make([]string, len(values))
		for i := range vs.values {
			b := bytes.Buffer{}
			if !handleMethods(cs, &b, vs.values[i]) {
				vs.strings = nil
				break
			}
			vs.strings[i] = b.String()
		}
	}
	if vs.strings == nil && cs.SpewKeys {
		vs.strings = make([]string, len(values))
		for i := range vs.values {
			vs.strings[i] = Sprintf("%#v", vs.values[i].Interface())
		}
	}
	return vs
}

// canSortSimply tests whether a reflect.Kind is a primitive that can be sorted
// directly, or whether it should be considered for sorting by surrogate keys