Function lookupMapPath

internal/pushrules/util.go:74–93

lookupMapPath traverses a hierarchical map structure, like the one produced by json.Unmarshal, to return the leaf value. Traversing arrays/slices is not supported, only objects/maps.

(path []string, m map[string]interface{})

// produced by json.Unmarshal, to return the leaf value. Traversing
// arrays/slices is not supported, only objects/maps.
func lookupMapPath(path []string, m map[string]interface{}) (interface{}, error) {
	if len(path) == 0 {
		return nil, fmt.Errorf("empty path")
	}

	var v interface{} = m
	for i, key := range path {
		m, ok := v.(map[string]interface{})
		if !ok {
			return nil, fmt.Errorf("expected an object for path %q, but got %T", strings.Join(path[:i+1], "."), v)
		}

		v, ok = m[key]
		if !ok {
			return nil, fmt.Errorf("path not found: %s", strings.Join(path[:i+1], "."))
		}
	}

	return v, nil
}

// parseRoomMemberCountCondition parses a string like "2", "==2", "<2"
// into a function that checks if the argument to it fulfils the