Function getVariablesAndQuery

dql/parser.go:863–895

getVariablesAndQuery checks if the query has a variable list and stores it in vmap. For variable list to be present, the query should have a name which is also checked for. It also calls getQuery to create the GraphQuery object tree.

(it *lex.ItemIterator, vmap varMap)

// vmap. For variable list to be present, the query should have a name which is
// also checked for. It also calls getQuery to create the GraphQuery object tree.
func getVariablesAndQuery(it *lex.ItemIterator, vmap varMap) (gq *GraphQuery, rerr error) {
	var name string
L2:
	for it.Next() {
		item := it.Item()
		switch item.Typ {
		case itemName:
			if name != "" {
				return nil, item.Errorf("Multiple word query name not allowed.")
			}
			name = item.Val
		case itemLeftRound:
			if name == "" {
				return nil, item.Errorf("Variables can be defined only in named queries.")
			}

			if rerr = parseDqlVariables(it, vmap); rerr != nil {
				return nil, rerr
			}

			if rerr = checkValueType(vmap); rerr != nil {
				return nil, rerr
			}
		case itemLeftCurl:
			if gq, rerr = getQuery(it); rerr != nil {
				return nil, rerr
			}
			break L2
		}
	}

	return gq, nil
}

// parseVarName returns the variable name.
func parseVarName(it *lex.ItemIterator) (string, error) {