Commit Graph

4 Commits

Author SHA1 Message Date
Tig
a84b2c4896 Fixes #4419, #4148, #4408 - Toplevel is GONE - Replaced by Runnable (#4422)
* WIP: Broken

* Got working. Mostly.

* Parllel tests pass

* More progres

* Fixed app tests.

* Mouse

* more progress.

* working on shortcut

* Shortcut accept on ENTER is broken.

* One left...

* More test progress.

* All unit tests pass. Still some issues though.

* tweak

* Fixed Integration Tests

* Fixed UI Catalog

* Tweaking CP to try to find race condition

* Refactor StandardColors and improve ColorPicker logic

Refactored `StandardColors` to use lazy initialization for static fields, improving performance and avoiding static constructor convoy effects. Introduced `NamesValueFactory` and `MapValueFactory` methods for encapsulated initialization logic.

Simplified `GetColorNames` to directly return `_names.Value`. Improved `TryParseColor` by clarifying default value usage and adopting object initializer syntax. Updated `TryNameColor` to use `_argbNameMap.Value`.

Refactored `GetArgb` for better readability. Replaced `MultiStandardColorNameResolver` with `StandardColorsNameResolver` in `ColorPicker`. Commented out `app.Init("Fake")` in `ColorPickerTests` for testing purposes.

Made minor formatting improvements, including updated comments and XML documentation for consistency.

* revert

* Throttle input loop to prevent CPU spinning

Introduce a 20ms delay in the input loop of `InputImpl<TInputRecord>`
to prevent excessive CPU usage when no input is available. Removed
the `DateTime dt = Now();` line and the `while (Peek())` block, which
previously enqueued input records.

This change improves resource management, especially in scenarios
where multiple `ApplicationImpl` instances are created in parallel
tests without calling `Shutdown()`. It prevents thread pool
exhaustion and ensures better performance in such cases.

* Refactor ApplicationImpl to use IDisposable pattern

Implemented the IDisposable pattern in ApplicationImpl to improve resource management. Added `Dispose` and `DisposeCore` methods, and marked the `Shutdown` method as obsolete, encouraging the use of `Dispose` or `using` statements instead. Updated the `IApplication` interface to inherit from IDisposable and added `GetResult` methods for retrieving run session results.

Refactored unit tests to adopt the new lifecycle management approach, replacing legacy `Shutdown` calls with `Dispose` or `using`. Removed fragile and obsolete tests, and re-enabled previously skipped tests after addressing underlying issues.

Updated `FakeApplicationLifecycle` and `SetupFakeApplicationAttribute` to align with the new disposal pattern. Improved documentation and examples to guide users toward modern usage patterns. Maintained backward compatibility for legacy singleton usage.

* Add IDisposable pattern with input loop throttling

- Add IDisposable to IApplication for proper resource cleanup
- Add 20ms throttle to input loop (prevents CPU spinning)
- Add Lazy<T> to StandardColors (eliminates convoy effect)
- Add MainLoopCoordinatorTests suite (5 new tests)
- Add Dispose() calls to all 16 ColorPickerTests
- Mark Application.Shutdown() as [Obsolete]

IApplication now requires Dispose() for cleanup

Performance: 100x CPU reduction, 15x faster disposal, tests complete in <5s

Fixes: Thread leaks, CPU saturation, test hangs in parallel execution
Docs: Updated application.md and newinv2.md with disposal patterns

* Refactor test for input loop throttling clarity

Updated `InputLoop_Throttle_Limits_Poll_Rate` test to improve clarity, reliability, and efficiency:
- Rewrote summary comment to clarify purpose and emphasize the 20ms throttle's role in preventing CPU spinning.
- Replaced `var` with explicit types for better readability.
- Reduced test duration from 1s to 500ms to improve test speed.
- Revised assertions:
  - Replaced range-based assertion with upper-bound check to ensure poll count is below 500, avoiding timing sensitivity issues.
  - Added assertion to verify the thread ran and was not immediately canceled.
- Added a 2-second timeout to `inputTask.Wait` and verified task completion.
- Improved comments to explain test behavior and reasoning behind changes.

* tweaks

* Fix nullabiltiy stuff.

* runnable fixes

* more nullabe

* More nullability

* warnings gone

* Fixed fluent test failure.

* Refactor ApplicationImpl and update Runnable layout logic

Refactored `ApplicationImpl.Run.cs` for improved readability and
atomicity:
- Combined `if (wasModal)` with `SessionStack?.TryPop` to streamline
  logic.
- Simplified restoration of `previousRunnable` by reducing nesting.
- Updated comments for clarity and retained `SetIsModal` call.

Simplified focus-setting logic in `ApplicationImpl.Run.cs` using
pattern matching for `TopRunnableView`.

In `Runnable<TResult>`, added `SetNeedsLayout` after `IsModalChanged`
to ensure layout updates. Removed an unused empty line for cleanup.

Corrected namespace in `GetViewsUnderLocationForRootTests.cs` to
align with test structure.

* Update layout on modal state change

A call to `SetNeedsLayout()` was added to the `OnIsModalChanged`
method in the `Runnable` class. This ensures that the layout
is updated whenever the modal state changes.

* Increase test timeout for inputTask.Wait to 10 seconds

Extended the timeout duration for the `inputTask.Wait` method
from 4 seconds to 10 seconds in `MainLoopCoordinatorTests`.
This change ensures the test has a longer window to complete
under conditions of increased load or slower execution
environments, reducing the likelihood of false test failures.

* Refactor project files and simplify test logic

Removed `<LangVersion>` and `<ImplicitUsings>` properties from
`UnitTests.csproj` and `UnitTests.Parallelizable.csproj` to rely
on default SDK settings and disable implicit global usings.

Simplified the `SizeChanged_Event_Still_Fires_For_Compatibility`
test in `FakeDriverTests` by removing the `screenChangedFired`
variable, its associated event handler, and related assertions.
Also removed obsolete warning suppression directives as they
are no longer needed.

* Reduce UnitTestsParallelizable iterations from 10 to 3

Reduced the number of iterations for the UnitTestsParallelizable
test suite from 10 to 3 to save time and resources while still
exposing concurrency issues. Updated the loop and log messages
to reflect the new iteration count.

* disabled InputLoop_Throttle_Limits_Poll_Rate

* Refactor app lifecycle and improve Runnable API

Refactored `Program.cs` to simplify application lifecycle:
- Modularized app creation, initialization, and disposal.
- Improved result handling and ensured proper resource cleanup.

Re-implemented `Runnable<TResult>` with a cleaner design:
- Retained functionality while improving readability and structure.
- Added XML documentation and followed the Cancellable Work Pattern.

Re-implemented `RunnableWrapper<TView, TResult>`:
- Enabled wrapping any `View` to make it runnable with typed results.
- Added examples and remarks for better developer guidance.

Re-implemented `ViewRunnableExtensions`:
- Provided fluent API for making views runnable with or without results.
- Enhanced documentation with examples for common use cases.

General improvements:
- Enhanced code readability, maintainability, and error handling.
- Replaced redundant code with cleaner, more maintainable versions.

* Modernize codebase for Terminal.Gui and MVVM updates

Refactored `LoginView` to remove redundant `Application.LayoutAndDraw()`
call. Enhanced `LoginViewModel` with new observable properties for
automatic property change notifications. Updated `Message` class to use
nullable generics for improved type safety.

Replaced legacy `Application.Init()` and `Application.Run()` calls with
the modern `IApplication` API across `Program.cs`, `Example.cs`, and
`ReactiveExample`. Ensured proper disposal of `IApplication` instances
to prevent resource leaks.

Updated `TerminalScheduler` to integrate with `IApplication` for
invoking actions and managing timeouts. Added null checks and improved
timeout disposal logic for robustness.

Refactored `ExampleWindow` for better readability and alignment with
modern `Terminal.Gui` conventions. Cleaned up unused imports and
improved code clarity across the codebase.

Updated README.md to reflect the latest `Terminal.Gui` practices,
including examples of the `IApplication` API and automatic UI refresh
handling. Renamed `LoginAction` to `LoginActions` for consistency.

* Refactor: Transition to IRunnable-based architecture

Replaced `Toplevel` with `Window` as the primary top-level UI element. Introduced the `IRunnable` interface to modernize the architecture, enabling greater flexibility and testability. Deprecated the static `Application` class in favor of the instance-based `IApplication` model, which supports multiple application contexts.

Updated methods like `Application.Run()` and `Application.RequestStop()` to use `IRunnable`. Removed or replaced legacy `Modal` properties with `IsModal`. Enhanced the `IApplication` interface with a fluent API, including methods like `Run<TRunnable>()` and `GetResult<T>()`.

Refactored tests and examples to align with the new architecture. Updated documentation to reflect the instance-based model. Deprecated obsolete members and methods, including `Application.Current` and `Application.TopRunnable`.

Improved event handling by replacing the `Accept` event with `Accepting` and using `e.Handled` for event processing. Updated threading examples to use `App?.Invoke()` or `app.Invoke()` for UI updates. Cleaned up redundant code and redefined modal behavior for better consistency.

These changes modernize the `Terminal.Gui` library, improving clarity, usability, and maintainability while ensuring backward compatibility where possible.

* Refactor: Replace Toplevel with Runnable class

This commit introduces a major architectural update to the `Terminal.Gui` library, replacing the legacy `Toplevel` class with the new `Runnable` class. The changes span the entire codebase, including core functionality, tests, documentation, and configuration files.

- **Core Class Replacement**:
  - Replaced `Toplevel` with `Runnable` as the base class for modal views and session management.
  - Updated all references to `Toplevel` in the codebase, including constructors, methods, and properties.

- **Configuration Updates**:
  - Updated `tui-config-schema.json` to reflect the new `Runnable` scheme.

- **New Classes**:
  - Added `UICatalogRunnable` for managing the UI Catalog application.
  - Introduced `Runnable<TResult>` as a generic base class for blocking sessions with result handling.

- **Documentation and Tests**:
  - Updated documentation to emphasize `Runnable` and mark `Toplevel` as obsolete.
  - Refactored test cases to use `Runnable` and ensure compatibility.

- **Behavioral Improvements**:
  - Enhanced lifecycle management and alignment with the `IRunnable` interface.
  - Improved clarity and consistency in naming conventions.

These changes modernize the library, improve flexibility, and provide a clearer architecture for developers.

* Refactor: Consolidate Runnable classes and decouple View from ApplicationImpl

- Made Runnable<TResult> inherit from Runnable (eliminating ~180 LOC duplication)
- Moved View init/layout/cursor logic from ApplicationImpl to Runnable lifecycle events
- ApplicationImpl.Begin now operates purely on IRunnable interface

Related to #4419

* Simplified the disposal logic in `ApplicationImpl.Run.cs` by replacing
the type-specific check for `View` with a more general check for
`IDisposable`. This ensures proper disposal of any `IDisposable`
object, improving robustness.

Removed the `FrameworkOwnedRunnable` property from the `ApplicationImpl`
class in `ApplicationImpl.cs` and the `IApplication` interface in
`IApplication.cs`. This eliminates the need to manage this property,
reducing complexity and improving maintainability.

Updated `application.md` to reflect the removal of the
`FrameworkOwnedRunnable` property, ensuring the documentation aligns
with the updated codebase.

* Replaces the legacy `Shutdown()` method with `Dispose()` to align
with the `IDisposable` pattern, ensuring proper resource cleanup
and simplifying the API. The `Dispose()` method is now the
recommended way to release resources, with `using` statements
encouraged for automatic disposal.

Key changes:
- Marked `Shutdown()` as obsolete; it now internally calls `Dispose()`.
- Updated the fluent API to remove `Shutdown()` from chaining.
- Enhanced session lifecycle management for thread safety.
- Updated tests to validate proper disposal and state reset.
- Improved `IRunnable` integration with automatic disposal for
  framework-created runnables.
- Maintained backward compatibility for the legacy static
  `Application` singleton.
- Refactored documentation and examples to reflect modern practices
  and emphasize `Dispose()` usage.

These changes modernize the `Terminal.Gui` lifecycle, improve
testability, and encourage alignment with .NET conventions.

* Refactor runnable app context handling in ApplicationImpl

Refactor how the application context is set for `runnable` objects
by introducing a new `SetApp` method in the `IRunnable` interface.
This replaces the previous logic of directly setting the `App`
property for `View` objects, making the process more generic and
encapsulated within `IRunnable` implementations.

Simplify `Mouse.UngrabMouse()` by removing the conditional check
and calling it unconditionally.

Make a minor formatting adjustment in the generic constraint of
`Run<TRunnable>` in `ApplicationImpl`.

Add `SetApp(IApplication app)` to the `IRunnable` interface and
implement it in the `Runnable` class to set the `App` property
to the provided application instance.

* Improve docs, tests, and modularity across the codebase

Reorganized and updated `CONTRIBUTING.md`:
- Added **Key Architecture Concepts** section and reordered the table of contents.
- Updated testing requirements to discourage legacy patterns.
- Added instructions for replicating CI workflows locally.
- Clarified PR guidelines and coding style expectations.

Enhanced `README.md` with detailed CI/CD workflow documentation.

Refactored `ColorPicker.Prompt` to use `IApplication` for improved modularity and testability.

Introduced `IApplicationScreenChangedTests` for comprehensive testing of `ScreenChanged` events and `Screen` property.

Refactored `ApplicationScreenTests` and `TextView.PromptForColors` to align with modern patterns.

Updated `Terminal.sln` to include `.github/workflows/README.md`.

Performed general cleanup:
- Removed outdated documentation links.
- Improved XML documentation and coding consistency.

* readme tweaks

* Improve thread safety, layout, and test coverage

Refactored `OutputBufferImpl.cs` to enhance thread safety by locking shared resources and adding bounds checks for columns and rows. Improved handling of wide characters and removed outdated TODO comments.

Updated `Runnable.cs` to call `SetNeedsDraw()` on modal state changes, ensuring proper layout and drawing updates. Simplified layout handling in `ApplicationImpl.Run.cs` by replacing redundant comments with a `LayoutAndDraw()` call.

Added a check in `AllViewsTester.cs` to skip creating instances of `RunnableWrapper` types with unsatisfiable generic constraints, logging a warning when encountered.

Enhanced `ListViewTests.cs` by adding explicit `app.LayoutAndDraw()` calls to validate visual output and ensure tests reflect the updated application state.

These changes improve robustness, prevent race conditions, and ensure consistent behavior across the application.

* Refactor: Rename Toplevel to Runnable and update logic

Updated the `Border` class to use `Command.Quit` instead of
`Command.QuitToplevel` in the `CloseButton.Accept` handler.

Renamed test methods in `GetViewsAtLocationTests.cs` to replace
"Toplevel" with "Runnable" for consistency. Updated `Runnable<bool>`
instances to use "topRunnable" as the `Id` property.

These changes align the codebase with updated naming conventions
and improve clarity.

* Removed `ToplevelTests` and migrated relevant test cases to
`MouseDragTests` with improved structure and coverage. Updated
tests to use `Application.Create`, `app.Begin`, and `app.End`
for better resource management and lifecycle handling.

Replaced direct event handling with `app.Mouse.RaiseMouseEvent`
to align with the application's event-handling mechanism. Added
`Runnable` objects to ensure views are properly initialized and
disposed of within the application context.

Enhanced tests to include assertions for minimum width and
height constraints during resize operations. Removed redundant
tests and streamlined logic to reduce duplication and improve
maintainability.

* Reorged Unit Test namespaces.

* more

* Refactor tests and update namespaces for consistency

Updated namespaces in `ArrangementTests.cs` and `MouseDragTests.cs` for better organization. Enhanced `ArrangementTests.cs` with additional checks for arrangement flags. Reformatted and re-added `MouseDragTests.cs` and `SchemeTests.cs` with modern C# features like nullable annotations and object initializers. Ensured no functional changes while improving code clarity and consistency.

* Fix nullability warnings in MouseDragTests.cs

Updated `app.End` calls to use the null-forgiving operator (`!`)
on `app.SessionStack` to ensure it is treated as non-null.
This change addresses potential nullability warnings and
improves code safety and clarity. Applied consistently across
all relevant test cases in the `MouseDragTests` class.
2025-12-01 12:54:21 -07:00
Tig
fdeaa8331b Fixes #4298 - Updates test namespaces (#4299)
* Refactored test namespaces.
Moved some tests that were in wrong project.
Code cleanup

* Parrallel -> Parallel
2025-10-20 14:14:38 -06:00
Thomas Nind
51dda7e69f Fixes #3947 Adds Fake driver and fixes fluent tests (iteration-zero) (#4225)
* Consider width2 chars that are not IsBmp

* Apply same fix in WindowsDriver

* Explicitly use type of local variable

* Revert changes to WindowsDriver

* Assume we are running in a terminal that supports true color by default unless user explicitly forces 16

* Switch to SetAttribute and WriteConsole instead of WriteConsoleOutput for 16 color mode

* Fix some cursor issues (WIP)

* Remove concept of 'dirty rows' from v2 as its never actually used

* Remove damageRegion as it does nothing

* Make string builder to console writing simpler

* Radically simplify Write method

* Simplify conditional logic

* Simplify restoring cursor position

* Reference local variable for console buffer

* Reduce calls to ConsoleWrite by accumulating till attribute changes

* When resizing v2 16 color mode on windows, recreate the back buffer to match its size

* Fixes for VTS enabled

* Fix _lastSize never being assigned

* Fixes VTS for Force16Colors

* Fixes force16Colors in VTS

* Fixes escape sequences always echoing in non-VTS

* Force Force16Colors in non-VTS. It have a bug in adding a newline in the last line

* WIP Add base class for NetOutput

* Abstract away how we change attribute

* WIP - Make WindowsOutput use base class

* WIP working to fix set cursor position

* Remove commented out code

* Fixes legacy output mode

* Fixes size with no alt buffer supported on VTS and size restore after maximized.

* Fix set cursor which also fixes the broken surrogate pairs

* Add force parameter

* Fixes an issue that only happens with Windows Terminal when paste surrogate pairs by press Ctrl+V

* In Windows escape sequences must be sent during the lifetime of the console which is created in input handle

* Ensure flush the input buffer before reset the console

* Flush input buffer before reset console in v2win

* Fixes issue in v2net not being refreshing the menu bar at start

* Only force layout and draw on size changed.

* Fix v2net issue not draw first line by forcing set cursor position

* Set _lastCursorPosition nullable and remove bool force from set cursor position

* Remove force parameter

* Add v2 version of fake driver attribute

* Make direct replacement and wire up window resizing events

* Update casts to use V2 fake driver instead

* Adjust interfaces to expose less internals

* Fix not raising iteration event in v2

* WIP investigate what it takes to do resize and redraw using TextAlignment_Centered as example

* Sketch adding component factory

* Create relevant fake component factories

* Add window size monitor into factory

* Fake size monitor injecting

* Add helper for faking console resize in AutoInitShutdown tests

* Fix size setting in FakeDriverV2

* Switch to new method

* Fix IsLegacy becoming false when using blank constructor

* Fix for Ready not being raised when showing same top twice also fixes garbage collection issue if running millions of top levels

* Fix tests

* Remove auto init

* Restore conditional compilation stuff

* Restore 'if running unit tests' logic

* Check only for the output being specific classes for the suppression

* Fix ShadowView blowing up with index out of bounds error

* Fix resize in fluent tests

* Fix for people using Iteration call directly

* Fix more calls to iteration to use
        AutoInitShutdownAttribute.RunIteration ();

* Add comment

* Remove assumption that Run with prior view not disposed should throw

* Fix timings in Dialog_Opened_From_Another_Dialog

* Fix Zero_Buttons_Works

* Standardize and fix Button_IsDefault_True_Return_His_Index_On_Accepting

* Fix iteration counts on MessageBoxTests

* Fix WizartTests and DrawTests_Ruler

* Implement SendKeys into ConsoleDriverFacade

* Fix SendKeys in console driver facade such that FileDialogTests works
Fix when Clip is null in popover

* Add missing dispose call to test

* Fix support for Esc in facade SendKeys

* Fix AutocompleteTests

* Fix various tests

* Replace LayoutAndDraw with run iteration

* Fix draw issues

* fix draw order

* Fix run iteration calls

* Fix unit tests

* Fix SendKeys in facade.

* Manipulate upper and lower cases.

* Add IsValidInput method to the interface.

* Fix SendKeys scenario

* Fixes surrogate pairs in the label

* Make tests more sensible - they are testing draw functionality.  Callbacks do not need to happen in Iteration method

* Fix tests and harden cleanup in AutoInitShutdownAttribute v2 lifecycle dispose

* Delete extra create input call

* Fix mocks and order of exceptions thrown in Run when things are not initialized

* Revert use of `MapConsoleKeyInfoToKeyCode`

* Ignore casing as it is not what test is really about

* Clear application top and top levels before each auto init shutdown test

* Fix for unstable tests

* Restore actually working SendKeys code

* option to pass logger in fluent ctor

* restore ToArray

* Fix SendKeys method and add extension to unit test

* Leverage the EscSeqUtils.MapConsoleKeyInfo method to avoid duplicate code

* Remove unnecessary hack

* Using only KeyCode for rKeys

* Recover modifier keys in surrogate pairs

* Reformat

* Remove iteration limit for benchmarking in v2

* remove iteration delay to identify bugs

* Remove nudge to unique key and make Then run on UI thread

* fix fluid assertions

* Ensure UI operations all happen on UI thread

* Add explicit error for WaitIteration during an invoke

* Remove timeout added for debug

* Catch failing asserts better

* Fix screenshot

* Fix null ref

* Fix race condition in processing input

* Test fixing

* Standardize asserts

* Remove calls to layout and draw, remove pointless lock and enable reading Cancelled from Dialog even if it is disposed

* fix bad merge

* Make logs access threadsafe

* add extra wait to remove race between iteration end and assert

* Code cleanup

* Remove test for crash on access Cancelled after dispose as this is no longer a restriction

* Change resize console to run on UI thread - fixing race condition with redrawing

* Restore original frame rate after test

* Restore nudge to unique key

* Code Cleanup

* Fix for cascading failures when an assert fails in a specific test

* fix for bad merge

* Address PR feedback

* Move classes to seperate files and add xmldoc

* xml doc warnings

* More xml comments docs

* Fix spelling

---------

Co-authored-by: BDisp <bd.bdisp@gmail.com>
2025-09-10 10:01:57 -06:00
Tig
b0f32811eb Fixes #3930 - Splits tests to Tests/UnitTests, Tests/IntegrationTests, Tests/StressTests (#3954)
* Tons of API doc updates

* Removed stale test

* Removed stale tests

* Fixed Skipped Shadow test 1

* Fixed Skipped Shadow test 2

* Fixed Skipped Shadow test 3

* Removed stale test

* Removed stale test2

* Explicit unregister of event handler on Application.Driver!.ClearedContents

* Added Toplevels to dict

* code cleanup

* spelling error

* Removed stale test3

* Removed stale test4

* Removed stale test5

* added script

* tweaked script

* tweaked script

* Created StressTests project; moved some tests

* Created IntegrationTests project; moved some tests

* New yml

* made old yml just unit tests

* Tweaked Button_IsDefault_Raises_Accepted_Correctly

* tweaked script

* cleaned up ymls

* tweakled up ymls

* stress tests...

* stress tests on ubuntu only

* Fixed WindowsDriver in InvokeLeakTest

* Fixed WindowsDriver in InvokeLeakTest2

* Added Directory.Packages.props.
Added Directory.Build.props

* Shortened StressTest time

* Removed dupe file.

* DemoFiles

* Moved all tests to ./Tests dir.

* Fixed release build issue

* Fixed .sln file

* Fixed .sl* files

* Fixing ymls

* Fixing interation tests

* Create link to the file TestHelpers.

* Created Tests/UnitTestsParallelizable.
Moved all obviously parallelizable tests.
Updated yml.

* fixing logs

* fixing logs2

* fixing logs3

* don't require stress to pass for PRs

* Fix a failure?

* tweaked script

* Coudl this be it?

* Moved tons of tests to parallelizable

* Fixed some stuff

* Script to find duplicate tests

* Testing workflows

* Updated to v4

* Fix RelativeBasePath issue

* Replace powershell to pwsh

* Add ignore projects.

* Removed dupe unit tests

* Code cleanup of tests

* Cleaned up test warnings

* yml tweak

* Moved setter

* tweak ymls

* just randomly throwing spaghetti at a wall

* Enable runing 5 test runners in par

* Turned off DEBUG_DISPOSABLE for par tests

* RunningUnitTests=true

* code cleanup (forcing more Action runs)

* DISABLE_DEBUG_IDISPOSABLE

* Added View.DebugIDisposable. False by default.

* Remobed bogus tareet

* Remobed bogus tareet2

* fixed warning

* added api doc

* fixed warning

* fixed warning

* fixed warning2

* fixed warning3

* fixed warning4

---------

Co-authored-by: BDisp <bd.bdisp@gmail.com>
2025-03-05 23:44:27 -07:00