Method parseReplaceFunc

parse/parse.go:248–296

parses the ${param/pattern/string} string function parses the ${param//pattern/string} string function parses the ${param/#pattern/string} string function parses the ${param/%pattern/string} string function

(name string)

// parses the ${param/#pattern/string} string function
// parses the ${param/%pattern/string} string function
func (t *Tree) parseReplaceFunc(name string) (Node, error) {
	node := new(FuncNode)
	node.Param = name

	t.scanner.accept = acceptReplaceFunc
	t.scanner.mode = scanIdent
	switch t.scanner.scan() {
	case tokenIdent:
		node.Name = t.scanner.string()
	default:
		return nil, ErrBadSubstitution
	}

	// scan arg[1]
	{
		param, err := t.parseParam(acceptNotSlash, scanIdent|scanEscape)
		if err != nil {
			return nil, err
		}
		node.Args = append(node.Args, param)
	}

	// expect delimiter
	t.scanner.accept = acceptSlash
	t.scanner.mode = scanIdent
	switch t.scanner.scan() {
	case tokenIdent:
		// no-op
	default:
		return nil, ErrBadSubstitution
	}

	// check for blank string
	switch t.scanner.peek() {
	case '}':
		return node, t.consumeRbrack()
	}

	// scan arg[2]
	{
		param, err := t.parseParam(acceptNotClosing, scanIdent|scanEscape)
		if err != nil {
			return nil, err
		}
		node.Args = append(node.Args, param)
	}

	return node, t.consumeRbrack()
}

// parses the ${parameter=word} string function
// parses the ${parameter:=word} string function