Function String

cft/format/format.go:33–122

String returns a string representation of the supplied cft.Template

(t *cft.Template, opt Options)

// String returns a string representation of the supplied cft.Template
func String(t *cft.Template, opt Options) string {
	node := t.Node

	buf := strings.Builder{}
	enc := yaml.NewEncoder(&buf)
	enc.SetIndent(2)

	node = formatNode(node)

	if !opt.Unsorted {
		node = orderTemplate(node)
	}

	err := enc.Encode(node)
	if err != nil {
		panic(err)
	}

	parts := strings.Split(strings.TrimSpace(buf.String()), "\n")
	result := strings.Builder{}

	lastIndent := 0
	indent := 0
	lastPartWasComment := false
	lastLineWasEmpty := false
	startMultilineIndent := -1

	for _, part := range parts {

		trimmedPart := strings.TrimLeft(part, " ")
		indent = len(part) - len(trimmedPart)

		// Leave lines alone if they are in a multiline block
		// Note: CloudFormation does not comply with the YAML spec. It treats > just like |
		// https://yaml-multiline.info/
		// https://stackoverflow.com/questions/3790454/how-do-i-break-a-string-in-yaml-over-multiple-lines
		// https://yaml.org/spec/1.2-old/spec.html#id2760844
		isMultiline := false
		if startMultilineIndent > -1 {
			// Note: len(part) == 0 means empty line without indentation
			// https://github.com/aws-cloudformation/rain/issues/126
			if indent <= startMultilineIndent && len(part) != 0 {
				startMultilineIndent = -1
			} else {
				isMultiline = true
			}
		}
		trimmedRight := strings.TrimRight(part, " ")
		if !isMultiline && CheckMultilineBegin(trimmedRight) {
			startMultilineIndent = indent
		}

		isComment := false
		if len(part) > 0 && strings.HasPrefix(trimmedPart, "#") {
			isComment = true
		}

		isEmpty := len(part) == 0 // This should never be true