Method formatDiffList

cmp/report_compare.go:204–405

(recs []reportRecord, k reflect.Kind, ptrs *pointerReferences)

}

func (opts formatOptions) formatDiffList(recs []reportRecord, k reflect.Kind, ptrs *pointerReferences) textNode {
	// Derive record name based on the data structure kind.
	var name string
	var formatKey func(reflect.Value) string
	switch k {
	case reflect.Struct:
		name = "field"
		opts = opts.WithTypeMode(autoType)
		formatKey = func(v reflect.Value) string { return v.String() }
	case reflect.Slice, reflect.Array:
		name = "element"
		opts = opts.WithTypeMode(elideType)
		formatKey = func(reflect.Value) string { return "" }
	case reflect.Map:
		name = "entry"
		opts = opts.WithTypeMode(elideType)
		formatKey = func(v reflect.Value) string { return formatMapKey(v, false, ptrs) }
	}

	maxLen := -1
	if opts.LimitVerbosity {
		if opts.DiffMode == diffIdentical {
			maxLen = ((1 << opts.verbosity()) >> 1) << 2 // 0, 4, 8, 16, 32, etc...
		} else {
			maxLen = (1 << opts.verbosity()) << 1 // 2, 4, 8, 16, 32, 64, etc...
		}
		opts.VerbosityLevel--
	}

	// Handle unification.
	switch opts.DiffMode {
	case diffIdentical, diffRemoved, diffInserted:
		var list textList
		var deferredEllipsis bool // Add final "..." to indicate records were dropped
		for _, r := range recs {
			if len(list) == maxLen {
				deferredEllipsis = true
				break
			}

			// Elide struct fields that are zero value.
			if k == reflect.Struct {
				var isZero bool
				switch opts.DiffMode {
				case diffIdentical:
					isZero = r.Value.ValueX.IsZero() || r.Value.ValueY.IsZero()
				case diffRemoved:
					isZero = r.Value.ValueX.IsZero()
				case diffInserted:
					isZero = r.Value.ValueY.IsZero()
				}
				if isZero {
					continue
				}
			}
			// Elide ignored nodes.
			if r.Value.NumIgnored > 0 && r.Value.NumSame+r.Value.NumDiff == 0 {
				deferredEllipsis = !(k == reflect.Slice || k == reflect.Array)