Method parseLenFunc

parse/parse.go:356–378

parses the ${#param} string function

()

// parses the ${#param} string function
func (t *Tree) parseLenFunc() (Node, error) {
	node := new(FuncNode)

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

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

	return node, t.consumeRbrack()
}

// consumeRbrack consumes a right closing bracket. If a closing
// bracket token is not consumed an ErrBadSubstitution is returned.