Function getFragment

dql/parser.go:1077–1112

getFragment parses a fragment definition (not reference).

(it *lex.ItemIterator)

// getFragment parses a fragment definition (not reference).
func getFragment(it *lex.ItemIterator) (*fragmentNode, error) {
	var name string
loop:
	for it.Next() {
		item := it.Item()
		switch item.Typ {
		case itemName:
			v := strings.TrimSpace(item.Val)
			if len(v) > 0 && name == "" {
				// Currently, we take the first nontrivial token as the
				// fragment name and ignore everything after that until we see
				// a left curl.
				name = v
			}
		case itemLeftCurl:
			break loop
		default:
			return nil, item.Errorf("Unexpected item in fragment: %v %v", item.Typ, item.Val)
		}
	}
	if name == "" {
		return nil, it.Errorf("Empty fragment name")
	}

	gq := &GraphQuery{
		Args: make(map[string]string),
	}
	if err := godeep(it, gq); err != nil {
		return nil, err
	}
	fn := &fragmentNode{
		Name: name,
		Gq:   gq,
	}
	return fn, nil
}

// parses till rightSquare is found (parses [a, b]) excluding leftSquare
// This function can be reused for query later