Method formatString

cmp/report_reflect.go:314–355

(prefix, s string)

}

func (opts formatOptions) formatString(prefix, s string) textNode {
	maxLen := len(s)
	maxLines := strings.Count(s, "\n") + 1
	if opts.LimitVerbosity {
		maxLen = (1 << opts.verbosity()) << 5   // 32, 64, 128, 256, etc...
		maxLines = (1 << opts.verbosity()) << 2 //  4, 8, 16, 32, 64, etc...
	}

	// For multiline strings, use the triple-quote syntax,
	// but only use it when printing removed or inserted nodes since
	// we only want the extra verbosity for those cases.
	lines := strings.Split(strings.TrimSuffix(s, "\n"), "\n")
	isTripleQuoted := len(lines) >= 4 && (opts.DiffMode == '-' || opts.DiffMode == '+')
	for i := 0; i < len(lines) && isTripleQuoted; i++ {
		lines[i] = strings.TrimPrefix(strings.TrimSuffix(lines[i], "\r"), "\r") // trim leading/trailing carriage returns for legacy Windows endline support
		isPrintable := func(r rune) bool {
			return unicode.IsPrint(r) || r == '\t' // specially treat tab as printable
		}
		line := lines[i]
		isTripleQuoted = !strings.HasPrefix(strings.TrimPrefix(line, prefix), `"""`) && !strings.HasPrefix(line, "...") && strings.TrimFunc(line, isPrintable) == "" && len(line) <= maxLen
	}
	if isTripleQuoted {
		var list textList
		list = append(list, textRecord{Diff: opts.DiffMode, Value: textLine(prefix + `"""`), ElideComma: true})
		for i, line := range lines {
			if numElided := len(lines) - i; i == maxLines-1 && numElided > 1 {
				comment := commentString(fmt.Sprintf("%d elided lines", numElided))
				list = append(list, textRecord{Diff: opts.DiffMode, Value: textEllipsis, ElideComma: true, Comment: comment})
				break
			}
			list = append(list, textRecord{Diff: opts.DiffMode, Value: textLine(line), ElideComma: true})
		}
		list = append(list, textRecord{Diff: opts.DiffMode, Value: textLine(prefix + `"""`), ElideComma: true})
		return &textWrap{Prefix: "(", Value: list, Suffix: ")"}
	}

	// Format the string as a single-line quoted string.
	if len(s) > maxLen+len(textEllipsis) {
		return textLine(prefix + formatString(s[:maxLen]) + string(textEllipsis))
	}
	return textLine(prefix + formatString(s))
}

// formatMapKey formats v as if it were a map key.
// The result is guaranteed to be a single line.