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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_BASE_INTERACTION_ELEMENT_SPECIFIER_H_
#define UI_BASE_INTERACTION_ELEMENT_SPECIFIER_H_
#include <compare>
#include <ostream>
#include <string>
#include <string_view>
#include <variant>
#include "base/component_export.h"
#include "ui/base/interaction/element_identifier.h"
namespace ui {
// Describes an element either by ID or by name.
//
// The default-constructed value is falsy. Passing a null ID or empty string
// also results in a falsy value.
class COMPONENT_EXPORT(UI_BASE_INTERACTION) ElementSpecifier final {
public:
ElementSpecifier();
ElementSpecifier(ElementIdentifier id); // NOLINT
ElementSpecifier(std::string_view name); // NOLINT
ElementSpecifier(const std::string& name); // NOLINT
ElementSpecifier(const char* name); // NOLINT
ElementSpecifier(const ElementSpecifier&);
ElementSpecifier& operator=(const ElementSpecifier&);
~ElementSpecifier();
operator bool() const { // NOLINT
return !std::holds_alternative<std::monostate>(specifier_);
}
bool operator!() const {
return std::holds_alternative<std::monostate>(specifier_);
}
std::strong_ordering operator<=>(const ElementSpecifier& other) const =
default;
bool operator==(const ElementSpecifier& other) const = default;
bool is_identifier() const {
return std::holds_alternative<ElementIdentifier>(specifier_);
}
ElementIdentifier identifier() const {
return std::holds_alternative<ElementIdentifier>(specifier_)
? std::get<ElementIdentifier>(specifier_)
: ElementIdentifier();
}
bool is_name() const {
return std::holds_alternative<std::string>(specifier_);
}
std::string_view name() const {
return std::holds_alternative<std::string>(specifier_)
? std::get<std::string>(specifier_)
: std::string_view();
}
private:
using SpecifierType =
std::variant<std::monostate, ElementIdentifier, std::string>;
SpecifierType specifier_;
};
COMPONENT_EXPORT(UI_BASE_INTERACTION)
std::ostream& operator<<(std::ostream& os, ElementSpecifier specifier);
} // namespace ui
#endif // UI_BASE_INTERACTION_ELEMENT_SPECIFIER_H_
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