// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
library fuchsia.diagnostics;

enum PatternMatcher {
    WILDCARD = 0;
    GLOB = 1;
};

/// The set of states that a selection node can exist in. A selection-node
/// is a matcher of a container in a nested hierarchy, such as
/// a match of nested components at a location in the component hierarchy
/// or a match of nodes in an Inspect tree.
///
/// string_pattern: This is a provided string that defines a pattern to
///   match against at the current location in a nested hierarchy. The
///   parser treats wildcards (*) and backslashes (\) as special characters.
///   If you wish to match against literal wildcards, it must be escaped.
///   If you wish to match against literal backslashes, they must be escaped.
///
///   eg: <curr_node>/abc will match any node contained within curr_node
///       with the exact name "abc".
///   eg: <curr_node>/a\* will match any node contained within curr_node
///       with the exact name "a*".
///   eg: <curr_node>/a\\* will match any node contained within curr_node
///       that starts with exactly "a\".
///   eg: <curr_node>/a* will match any node contained within curr_node
///       that starts with "a".
///   eg: <curr_node>/a*b will match any node contained within curr_node
///       that starts with a and ends with b.
///   eg: <curr_node>/*b will match any node contained within curr_node
///       that ends with b.
///
/// pattern_matcher: This is either a wild-card or a glob.
///
///   wildcard: will match all nodes at the current location in the
///      component hierarchy. These PathSelectionNode types are a result of the
///      only text provided in the selector-node spot being an escaped star.
///
///   glob: will match all nodes at or below the current location in the
///      component hierarchy. These PathSelectionNode types are a result of
///      the only text provided in the selector-node spot being two escaped stars.
xunion PathSelectionNode {
    string:1024 string_pattern;
    PatternMatcher pattern_matcher;
};

/// ComponentSelector encodes path to a component that is being selected for.
/// The `component_moniker` specifies a pattern of component absolute monikers which
/// identify components being selected for.
table ComponentSelector {
    /// Vector encoding the absolute moniker of a component being selected for.
    ///
    /// There must be at least one path selection node provided, which
    /// specifies the component names that are matched by
    /// the current selector. With only the component name
    /// present, we treat the `component_moniker` as selecting for all monikers
    /// that end in the specified name.
    1: vector<PathSelectionNode>:1024 component_moniker;
};