Stop using Sender/Receiver in TerminalInputParser. (#1073)

Stop using Sender/Receiver in TerminalInputParser.

This will help removing usage of thread.

At some point, my goal is to have an initialization step when installing
the ScreenInteractive so that we can provide the terminal ID
synchronously without losing some events. This will help with:
https://github.com/ArthurSonzogni/FTXUI/pull/1069

examples/component/button.cpp

@@ -1,9 +1,64 @@
-#include "ftxui/component/component.hpp"
+// Copyright 2020 Arthur Sonzogni. All rights reserved.
-#include "ftxui/component/screen_interactive.hpp"
+// Use of this source code is governed by the MIT license that can be found in
+// the LICENSE file.
+#include <memory>  // for shared_ptr, __shared_ptr_access
+#include <string>  // for operator+, to_string
+
+#include "ftxui/component/captured_mouse.hpp"  // for ftxui
+#include "ftxui/component/component.hpp"  // for Button, Horizontal, Renderer
+#include "ftxui/component/component_base.hpp"      // for ComponentBase
+#include "ftxui/component/screen_interactive.hpp"  // for ScreenInteractive
+#include "ftxui/dom/elements.hpp"  // for separator, gauge, text, Element, operator|, vbox, border
+
+using namespace ftxui;
+
+// This is a helper function to create a button with a custom style.
+// The style is defined by a lambda function that takes an EntryState and
+// returns an Element.
+// We are using `center` to center the text inside the button, then `border` to
+// add a border around the button, and finally `flex` to make the button fill
+// the available space.
+ButtonOption Style() {
+  auto option = ButtonOption::Animated();
+  option.transform = [](const EntryState& s) {
+    auto element = text(s.label);
+    if (s.focused) {
+      element |= bold;
+    }
+    return element | center | borderEmpty | flex;
+  };
+  return option;
+}
 
 int main() {
-    auto screen = ftxui::ScreenInteractive::Fullscreen();
+  int value = 50;
-    auto testComponent = ftxui::Renderer([](){return ftxui::text("test Component");});
+
-    screen.Loop(testComponent);
+  // clang-format off
+  auto btn_dec_01 = Button("-1", [&] { value += 1; }, Style());
+  auto btn_inc_01 = Button("+1", [&] { value -= 1; }, Style());
+  auto btn_dec_10 = Button("-10", [&] { value -= 10; }, Style());
+  auto btn_inc_10 = Button("+10", [&] { value += 10; }, Style());
+  // clang-format on
+
+  // The tree of components. This defines how to navigate using the keyboard.
+  // The selected `row` is shared to get a grid layout.
+  int row = 0;
+  auto buttons = Container::Vertical({
+      Container::Horizontal({btn_dec_01, btn_inc_01}, &row) | flex,
+      Container::Horizontal({btn_dec_10, btn_inc_10}, &row) | flex,
+  });
+
+  // Modify the way to render them on screen:
+  auto component = Renderer(buttons, [&] {
+    return vbox({
+               text("value = " + std::to_string(value)),
+               separator(),
+               buttons->Render() | flex,
+           }) |
+           flex | border;
+  });
+
+  auto screen = ScreenInteractive::FitComponent();
+  screen.Loop(component);
   return 0;
 }

include/ftxui/dom/flexbox_config.hpp

@@ -12,7 +12,6 @@
 
 namespace ftxui {
 
-
 /// @brief FlexboxConfig is a configuration structure that defines the layout
 /// properties for a flexbox container.
 //

src/ftxui/component/component_fuzzer.cpp

@@ -2,6 +2,7 @@
 // Use of this source code is governed by the MIT license that can be found in
 // the LICENSE file.
 #include <cassert>
+#include <ftxui/component/event.hpp>
 #include <vector>
 #include "ftxui/component/component.hpp"
 #include "ftxui/component/terminal_input_parser.hpp"
@@ -212,16 +213,17 @@ extern "C" int LLVMFuzzerTestOneInput(const char* data, size_t size) {
   auto screen =
       Screen::Create(Dimension::Fixed(width), Dimension::Fixed(height));
 
-  auto event_receiver = MakeReceiver<Task>();
+  // Generate some events.
-  {
+  std::vector<Event> events;
-    auto parser = TerminalInputParser(event_receiver->MakeSender());
+  auto parser =
-    for (size_t i = 0; i < size; ++i)
+      TerminalInputParser([&](const Event& event) { events.push_back(event); });
+
+  for (size_t i = 0; i < size; ++i) {
     parser.Add(data[i]);
   }
 
-  Task event;
+  for (const auto& event : events) {
-  while (event_receiver->Receive(&event)) {
+    component->OnEvent(event);
-    component->OnEvent(std::get<Event>(event));
     auto document = component->Render();
     Render(screen, document);
   }

src/ftxui/component/screen_interactive.cpp

@@ -84,7 +84,8 @@ constexpr int timeout_milliseconds = 20;
 
 void EventListener(std::atomic<bool>* quit, Sender<Task> out) {
   auto console = GetStdHandle(STD_INPUT_HANDLE);
-  auto parser = TerminalInputParser(out->Clone());
+  auto parser =
+      TerminalInputParser([&](Event event) { out->Send(std::move(event)); });
   while (!*quit) {
     // Throttle ReadConsoleInput by waiting 250ms, this wait function will
     // return if there is input in the console.
@@ -137,7 +138,8 @@ void EventListener(std::atomic<bool>* quit, Sender<Task> out) {
 
 // Read char from the terminal.
 void EventListener(std::atomic<bool>* quit, Sender<Task> out) {
-  auto parser = TerminalInputParser(std::move(out));
+  auto parser =
+      TerminalInputParser([&](Event event) { out->Send(std::move(event)); });
 
   char c;
   while (!*quit) {
@@ -173,7 +175,8 @@ int CheckStdinReady(int usec_timeout) {
 
 // Read char from the terminal.
 void EventListener(std::atomic<bool>* quit, Sender<Task> out) {
-  auto parser = TerminalInputParser(std::move(out));
+  auto parser =
+      TerminalInputParser([&](Event event) { out->Send(std::move(event)); });
 
   while (!*quit) {
     if (!CheckStdinReady(timeout_microseconds)) {

src/ftxui/component/screen_interactive_test.cpp

@@ -27,9 +27,9 @@ namespace {
 // Capture the standard output (stdout) to a string.
 class StdCapture {
  public:
-  explicit StdCapture(std::string* captured)
+  explicit StdCapture(std::string* captured) : captured_(captured) {
-      : captured_(captured) {
+    if (pipe(pipefd_) != 0)
-    if (pipe(pipefd_) != 0) return;
+      return;
     old_stdout_ = dup(fileno(stdout));
     fflush(stdout);
     dup2(pipefd_[1], fileno(stdout));
@@ -188,9 +188,7 @@ TEST(ScreenInteractive, FixedSizeInitialFrame) {
     auto capture = StdCapture(&output);
 
     auto screen = ScreenInteractive::FixedSize(2, 2);
-    auto component = Renderer([&] {
+    auto component = Renderer([&] { return text("AB"); });
-      return text("AB");
-    });
 
     Loop loop(&screen, component);
     loop.RunOnce();
@@ -241,7 +239,6 @@ TEST(ScreenInteractive, FixedSizeInitialFrame) {
       "\r\n"sv;
   ASSERT_EQ(expected, output);
 #endif
-
 }
 
 }  // namespace ftxui

src/ftxui/component/terminal_input_parser.cpp

@@ -5,7 +5,7 @@
 
 #include <cstdint>                    // for uint32_t
 #include <ftxui/component/mouse.hpp>  // for Mouse, Mouse::Button, Mouse::Motion
-#include <ftxui/component/receiver.hpp>  // for SenderImpl, Sender
+#include <functional>                 // for std::function
 #include <map>
 #include <memory>   // for unique_ptr, allocator
 #include <utility>  // for move
@@ -90,7 +90,7 @@ const std::map<std::string, std::string> g_uniformize = {
     {"\x1B[X", "\x1B[24~"},  // F12
 };
 
-TerminalInputParser::TerminalInputParser(Sender<Task> out)
+TerminalInputParser::TerminalInputParser(std::function<void(Event)> out)
     : out_(std::move(out)) {}
 
 void TerminalInputParser::Timeout(int time) {
@@ -131,7 +131,7 @@ void TerminalInputParser::Send(TerminalInputParser::Output output) {
       return;
 
     case CHARACTER:
-      out_->Send(Event::Character(std::move(pending_)));
+      out_(Event::Character(std::move(pending_)));
       pending_.clear();
       return;
 
@@ -140,25 +140,25 @@ void TerminalInputParser::Send(TerminalInputParser::Output output) {
       if (it != g_uniformize.end()) {
         pending_ = it->second;
       }
-      out_->Send(Event::Special(std::move(pending_)));
+      out_(Event::Special(std::move(pending_)));
       pending_.clear();
     }
       return;
 
     case MOUSE:
-      out_->Send(Event::Mouse(std::move(pending_), output.mouse));  // NOLINT
+      out_(Event::Mouse(std::move(pending_), output.mouse));  // NOLINT
       pending_.clear();
       return;
 
     case CURSOR_POSITION:
-      out_->Send(Event::CursorPosition(std::move(pending_),  // NOLINT
+      out_(Event::CursorPosition(std::move(pending_),  // NOLINT
                                       output.cursor.x,      // NOLINT
                                       output.cursor.y));    // NOLINT
       pending_.clear();
       return;
 
     case CURSOR_SHAPE:
-      out_->Send(Event::CursorShape(std::move(pending_), output.cursor_shape));
+      out_(Event::CursorShape(std::move(pending_), output.cursor_shape));
       pending_.clear();
       return;
   }

src/ftxui/component/terminal_input_parser.hpp

@@ -4,12 +4,11 @@
 #ifndef FTXUI_COMPONENT_TERMINAL_INPUT_PARSER
 #define FTXUI_COMPONENT_TERMINAL_INPUT_PARSER
 
+#include <functional>
 #include <string>  // for string
 #include <vector>  // for vector
 
 #include "ftxui/component/mouse.hpp"  // for Mouse
-#include "ftxui/component/receiver.hpp"  // for Sender
-#include "ftxui/component/task.hpp"      // for Task
 
 namespace ftxui {
 struct Event;
@@ -17,7 +16,7 @@ struct Event;
 // Parse a sequence of |char| accross |time|. Produces |Event|.
 class TerminalInputParser {
  public:
-  explicit TerminalInputParser(Sender<Task> out);
+  explicit TerminalInputParser(std::function<void(Event)> out);
   void Timeout(int time);
   void Add(char c);
 
@@ -62,7 +61,7 @@ class TerminalInputParser {
   Output ParseMouse(bool altered, bool pressed, std::vector<int> arguments);
   Output ParseCursorPosition(std::vector<int> arguments);
 
-  Sender<Task> out_;
+  std::function<void(Event)> out_;
   int position_ = -1;
   int timeout_ = 0;
   std::string pending_;

src/ftxui/component/terminal_input_parser_test.cpp

@@ -2,12 +2,12 @@
 // Use of this source code is governed by the MIT license that can be found in
 // the LICENSE file.
 #include <ftxui/component/mouse.hpp>  // for Mouse, Mouse::Left, Mouse::Middle, Mouse::Pressed, Mouse::Released, Mouse::Right
-#include <ftxui/component/task.hpp>   // for Task
+#include <functional>                 // for function
 #include <initializer_list>           // for initializer_list
 #include <memory>                     // for allocator, unique_ptr
+#include <vector>                     // for vector
 
 #include "ftxui/component/event.hpp"  // for Event, Event::Return, Event::ArrowDown, Event::ArrowLeft, Event::ArrowRight, Event::ArrowUp, Event::Backspace, Event::End, Event::Home, Event::Custom, Event::Delete, Event::F1, Event::F10, Event::F11, Event::F12, Event::F2, Event::F3, Event::F4, Event::F5, Event::F6, Event::F7, Event::F8, Event::F9, Event::PageDown, Event::PageUp, Event::Tab, Event::TabReverse, Event::Escape
-#include "ftxui/component/receiver.hpp"  // for MakeReceiver, ReceiverImpl
 #include "ftxui/component/terminal_input_parser.hpp"
 #include "gtest/gtest.h"  // for AssertionResult, Test, Message, TestPartResult, EXPECT_EQ, EXPECT_TRUE, TEST, EXPECT_FALSE
 
@@ -22,82 +22,69 @@ TEST(Event, Character) {
   for (char c = 'A'; c <= 'Z'; ++c)
     basic_char.push_back(c);
 
-  auto event_receiver = MakeReceiver<Task>();
+  std::vector<Event> received_events;
-  {
+  auto parser = TerminalInputParser(
-    auto parser = TerminalInputParser(event_receiver->MakeSender());
+      [&](Event event) { received_events.push_back(std::move(event)); });
   for (char c : basic_char)
     parser.Add(c);
-  }
 
-  Task received;
+  for (size_t i = 0; i < basic_char.size(); ++i) {
-  for (char c : basic_char) {
+    EXPECT_TRUE(received_events[i].is_character());
-    EXPECT_TRUE(event_receiver->Receive(&received));
+    EXPECT_EQ(basic_char[i], received_events[i].character()[0]);
-    EXPECT_TRUE(std::get<Event>(received).is_character());
-    EXPECT_EQ(c, std::get<Event>(received).character()[0]);
   }
-  EXPECT_FALSE(event_receiver->Receive(&received));
+  EXPECT_EQ(received_events.size(), basic_char.size());
 }
 
 TEST(Event, EscapeKeyWithoutWaiting) {
-  auto event_receiver = MakeReceiver<Task>();
+  std::vector<Event> received_events;
-  {
+  auto parser = TerminalInputParser(
-    auto parser = TerminalInputParser(event_receiver->MakeSender());
+      [&](Event event) { received_events.push_back(std::move(event)); });
-    parser.Add('\x1B');
+  parser.Add('');
-  }
 
-  Task received;
+  EXPECT_TRUE(received_events.empty());
-  EXPECT_FALSE(event_receiver->Receive(&received));
 }
 
 TEST(Event, EscapeKeyNotEnoughWait) {
-  auto event_receiver = MakeReceiver<Task>();
+  std::vector<Event> received_events;
-  {
+  auto parser = TerminalInputParser(
-    auto parser = TerminalInputParser(event_receiver->MakeSender());
+      [&](Event event) { received_events.push_back(std::move(event)); });
-    parser.Add('\x1B');
+  parser.Add('');
   parser.Timeout(49);
-  }
 
-  Task received;
+  EXPECT_TRUE(received_events.empty());
-  EXPECT_FALSE(event_receiver->Receive(&received));
 }
 
 TEST(Event, EscapeKeyEnoughWait) {
-  auto event_receiver = MakeReceiver<Task>();
+  std::vector<Event> received_events;
-  {
+  auto parser = TerminalInputParser(
-    auto parser = TerminalInputParser(event_receiver->MakeSender());
+      [&](Event event) { received_events.push_back(std::move(event)); });
-    parser.Add('\x1B');
+  parser.Add('');
   parser.Timeout(50);
-  }
 
-  Task received;
+  EXPECT_EQ(1, received_events.size());
-  EXPECT_TRUE(event_receiver->Receive(&received));
+  EXPECT_EQ(received_events[0], Event::Escape);
-  EXPECT_EQ(std::get<Event>(received), Event::Escape);
-  EXPECT_FALSE(event_receiver->Receive(&received));
 }
 
 TEST(Event, EscapeFast) {
-  auto event_receiver = MakeReceiver<Task>();
+  std::vector<Event> received_events;
-  {
+  auto parser = TerminalInputParser(
-    auto parser = TerminalInputParser(event_receiver->MakeSender());
+      [&](Event event) { received_events.push_back(std::move(event)); });
-    parser.Add('\x1B');
+  parser.Add('');
   parser.Add('a');
-    parser.Add('\x1B');
+  parser.Add('');
   parser.Add('b');
   parser.Timeout(49);
-  }
+
-  Task received;
+  EXPECT_EQ(2, received_events.size());
-  EXPECT_TRUE(event_receiver->Receive(&received));
+  EXPECT_EQ(received_events[0], Event::AltA);
-  EXPECT_EQ(std::get<Event>(received), Event::AltA);
+  EXPECT_EQ(received_events[1], Event::AltB);
-  EXPECT_TRUE(event_receiver->Receive(&received));
-  EXPECT_EQ(std::get<Event>(received), Event::AltB);
-  EXPECT_FALSE(event_receiver->Receive(&received));
 }
 
 TEST(Event, MouseLeftClickPressed) {
-  auto event_receiver = MakeReceiver<Task>();
+  std::vector<Event> received_events;
-  {
+  auto parser = TerminalInputParser(
-    auto parser = TerminalInputParser(event_receiver->MakeSender());
+      [&](Event event) { received_events.push_back(std::move(event)); });
-    parser.Add('\x1B');
+  parser.Add('');
   parser.Add('[');
   parser.Add('0');
   parser.Add(';');
@@ -107,23 +94,20 @@ TEST(Event, MouseLeftClickPressed) {
   parser.Add('4');
   parser.Add('2');
   parser.Add('M');
-  }
 
-  Task received;
+  EXPECT_EQ(1, received_events.size());
-  EXPECT_TRUE(event_receiver->Receive(&received));
+  EXPECT_TRUE(received_events[0].is_mouse());
-  EXPECT_TRUE(std::get<Event>(received).is_mouse());
+  EXPECT_EQ(Mouse::Left, received_events[0].mouse().button);
-  EXPECT_EQ(Mouse::Left, std::get<Event>(received).mouse().button);
+  EXPECT_EQ(12, received_events[0].mouse().x);
-  EXPECT_EQ(12, std::get<Event>(received).mouse().x);
+  EXPECT_EQ(42, received_events[0].mouse().y);
-  EXPECT_EQ(42, std::get<Event>(received).mouse().y);
+  EXPECT_EQ(received_events[0].mouse().motion, Mouse::Pressed);
-  EXPECT_EQ(std::get<Event>(received).mouse().motion, Mouse::Pressed);
-  EXPECT_FALSE(event_receiver->Receive(&received));
 }
 
 TEST(Event, MouseLeftMoved) {
-  auto event_receiver = MakeReceiver<Task>();
+  std::vector<Event> received_events;
-  {
+  auto parser = TerminalInputParser(
-    auto parser = TerminalInputParser(event_receiver->MakeSender());
+      [&](Event event) { received_events.push_back(std::move(event)); });
-    parser.Add('\x1B');
+  parser.Add('');
   parser.Add('[');
   parser.Add('3');
   parser.Add('2');
@@ -134,23 +118,20 @@ TEST(Event, MouseLeftMoved) {
   parser.Add('4');
   parser.Add('2');
   parser.Add('M');
-  }
 
-  Task received;
+  EXPECT_EQ(1, received_events.size());
-  EXPECT_TRUE(event_receiver->Receive(&received));
+  EXPECT_TRUE(received_events[0].is_mouse());
-  EXPECT_TRUE(std::get<Event>(received).is_mouse());
+  EXPECT_EQ(Mouse::Left, received_events[0].mouse().button);
-  EXPECT_EQ(Mouse::Left, std::get<Event>(received).mouse().button);
+  EXPECT_EQ(12, received_events[0].mouse().x);
-  EXPECT_EQ(12, std::get<Event>(received).mouse().x);
+  EXPECT_EQ(42, received_events[0].mouse().y);
-  EXPECT_EQ(42, std::get<Event>(received).mouse().y);
+  EXPECT_EQ(received_events[0].mouse().motion, Mouse::Moved);
-  EXPECT_EQ(std::get<Event>(received).mouse().motion, Mouse::Moved);
-  EXPECT_FALSE(event_receiver->Receive(&received));
 }
 
 TEST(Event, MouseLeftClickReleased) {
-  auto event_receiver = MakeReceiver<Task>();
+  std::vector<Event> received_events;
-  {
+  auto parser = TerminalInputParser(
-    auto parser = TerminalInputParser(event_receiver->MakeSender());
+      [&](Event event) { received_events.push_back(std::move(event)); });
-    parser.Add('\x1B');
+  parser.Add('');
   parser.Add('[');
   parser.Add('0');
   parser.Add(';');
@@ -160,23 +141,20 @@ TEST(Event, MouseLeftClickReleased) {
   parser.Add('4');
   parser.Add('2');
   parser.Add('m');
-  }
 
-  Task received;
+  EXPECT_EQ(1, received_events.size());
-  EXPECT_TRUE(event_receiver->Receive(&received));
+  EXPECT_TRUE(received_events[0].is_mouse());
-  EXPECT_TRUE(std::get<Event>(received).is_mouse());
+  EXPECT_EQ(Mouse::Left, received_events[0].mouse().button);
-  EXPECT_EQ(Mouse::Left, std::get<Event>(received).mouse().button);
+  EXPECT_EQ(12, received_events[0].mouse().x);
-  EXPECT_EQ(12, std::get<Event>(received).mouse().x);
+  EXPECT_EQ(42, received_events[0].mouse().y);
-  EXPECT_EQ(42, std::get<Event>(received).mouse().y);
+  EXPECT_EQ(received_events[0].mouse().motion, Mouse::Released);
-  EXPECT_EQ(std::get<Event>(received).mouse().motion, Mouse::Released);
-  EXPECT_FALSE(event_receiver->Receive(&received));
 }
 
 TEST(Event, MouseReporting) {
-  auto event_receiver = MakeReceiver<Task>();
+  std::vector<Event> received_events;
-  {
+  auto parser = TerminalInputParser(
-    auto parser = TerminalInputParser(event_receiver->MakeSender());
+      [&](Event event) { received_events.push_back(std::move(event)); });
-    parser.Add('\x1B');
+  parser.Add('');
   parser.Add('[');
   parser.Add('1');
   parser.Add('2');
@@ -184,21 +162,18 @@ TEST(Event, MouseReporting) {
   parser.Add('4');
   parser.Add('2');
   parser.Add('R');
-  }
 
-  Task received;
+  EXPECT_EQ(1, received_events.size());
-  EXPECT_TRUE(event_receiver->Receive(&received));
+  EXPECT_TRUE(received_events[0].is_cursor_position());
-  EXPECT_TRUE(std::get<Event>(received).is_cursor_position());
+  EXPECT_EQ(42, received_events[0].cursor_x());
-  EXPECT_EQ(42, std::get<Event>(received).cursor_x());
+  EXPECT_EQ(12, received_events[0].cursor_y());
-  EXPECT_EQ(12, std::get<Event>(received).cursor_y());
-  EXPECT_FALSE(event_receiver->Receive(&received));
 }
 
 TEST(Event, MouseMiddleClick) {
-  auto event_receiver = MakeReceiver<Task>();
+  std::vector<Event> received_events;
-  {
+  auto parser = TerminalInputParser(
-    auto parser = TerminalInputParser(event_receiver->MakeSender());
+      [&](Event event) { received_events.push_back(std::move(event)); });
-    parser.Add('\x1B');
+  parser.Add('');
   parser.Add('[');
   parser.Add('3');
   parser.Add('3');
@@ -209,22 +184,19 @@ TEST(Event, MouseMiddleClick) {
   parser.Add('4');
   parser.Add('2');
   parser.Add('M');
-  }
 
-  Task received;
+  EXPECT_EQ(1, received_events.size());
-  EXPECT_TRUE(event_receiver->Receive(&received));
+  EXPECT_TRUE(received_events[0].is_mouse());
-  EXPECT_TRUE(std::get<Event>(received).is_mouse());
+  EXPECT_EQ(Mouse::Middle, received_events[0].mouse().button);
-  EXPECT_EQ(Mouse::Middle, std::get<Event>(received).mouse().button);
+  EXPECT_EQ(12, received_events[0].mouse().x);
-  EXPECT_EQ(12, std::get<Event>(received).mouse().x);
+  EXPECT_EQ(42, received_events[0].mouse().y);
-  EXPECT_EQ(42, std::get<Event>(received).mouse().y);
-  EXPECT_FALSE(event_receiver->Receive(&received));
 }
 
 TEST(Event, MouseRightClick) {
-  auto event_receiver = MakeReceiver<Task>();
+  std::vector<Event> received_events;
-  {
+  auto parser = TerminalInputParser(
-    auto parser = TerminalInputParser(event_receiver->MakeSender());
+      [&](Event event) { received_events.push_back(std::move(event)); });
-    parser.Add('\x1B');
+  parser.Add('');
   parser.Add('[');
   parser.Add('3');
   parser.Add('4');
@@ -235,15 +207,12 @@ TEST(Event, MouseRightClick) {
   parser.Add('4');
   parser.Add('2');
   parser.Add('M');
-  }
 
-  Task received;
+  EXPECT_EQ(1, received_events.size());
-  EXPECT_TRUE(event_receiver->Receive(&received));
+  EXPECT_TRUE(received_events[0].is_mouse());
-  EXPECT_TRUE(std::get<Event>(received).is_mouse());
+  EXPECT_EQ(Mouse::Right, received_events[0].mouse().button);
-  EXPECT_EQ(Mouse::Right, std::get<Event>(received).mouse().button);
+  EXPECT_EQ(12, received_events[0].mouse().x);
-  EXPECT_EQ(12, std::get<Event>(received).mouse().x);
+  EXPECT_EQ(42, received_events[0].mouse().y);
-  EXPECT_EQ(42, std::get<Event>(received).mouse().y);
-  EXPECT_FALSE(event_receiver->Receive(&received));
 }
 
 TEST(Event, UTF8) {
@@ -313,31 +282,29 @@ TEST(Event, UTF8) {
 
   };
   for (auto test : kTestCase) {
-    auto event_receiver = MakeReceiver<Task>();
+    std::vector<Event> received_events;
-    {
+    auto parser = TerminalInputParser(
-      auto parser = TerminalInputParser(event_receiver->MakeSender());
+        [&](Event event) { received_events.push_back(std::move(event)); });
     for (auto input : test.input)
       parser.Add(input);
-    }
+
-    Task received;
     if (test.valid) {
-      EXPECT_TRUE(event_receiver->Receive(&received));
+      EXPECT_EQ(1, received_events.size());
-      EXPECT_TRUE(std::get<Event>(received).is_character());
+      EXPECT_TRUE(received_events[0].is_character());
+    } else {
+      EXPECT_TRUE(received_events.empty());
     }
-    EXPECT_FALSE(event_receiver->Receive(&received));
   }
 }
 
 TEST(Event, NewLine) {
   for (char newline : {'\r', '\n'}) {
-    auto event_receiver = MakeReceiver<Task>();
+    std::vector<Event> received_events;
-    {
+    auto parser = TerminalInputParser(
-      auto parser = TerminalInputParser(event_receiver->MakeSender());
+        [&](Event event) { received_events.push_back(std::move(event)); });
     parser.Add(newline);
-    }
+    EXPECT_EQ(1, received_events.size());
-    Task received;
+    EXPECT_TRUE(received_events[0] == Event::Return);
-    EXPECT_TRUE(event_receiver->Receive(&received));
-    EXPECT_TRUE(std::get<Event>(received) == Event::Return);
   }
 }
 
@@ -357,17 +324,16 @@ TEST(Event, Control) {
   cases.push_back({char(127), false});
 
   for (auto test : cases) {
-    auto event_receiver = MakeReceiver<Task>();
+    std::vector<Event> received_events;
-    {
+    auto parser = TerminalInputParser(
-      auto parser = TerminalInputParser(event_receiver->MakeSender());
+        [&](Event event) { received_events.push_back(std::move(event)); });
     parser.Add(test.input);
-    }
+
-    Task received;
     if (test.cancel) {
-      EXPECT_FALSE(event_receiver->Receive(&received));
+      EXPECT_TRUE(received_events.empty());
     } else {
-      EXPECT_TRUE(event_receiver->Receive(&received));
+      EXPECT_EQ(1, received_events.size());
-      EXPECT_EQ(std::get<Event>(received), Event::Special({test.input}));
+      EXPECT_EQ(received_events[0], Event::Special({test.input}));
     }
   }
 }
@@ -385,10 +351,9 @@ TEST(Event, Special) {
     Event expected;
   } kTestCase[] = {
       // Arrow (default cursor mode)
-      {str("\x1B[A"), Event::ArrowUp},    {str("\x1B[B"), Event::ArrowDown},
+      {str(""), Event::ArrowUp},    {str(""), Event::ArrowDown},
-      {str("\x1B[C"), Event::ArrowRight}, {str("\x1B[D"), Event::ArrowLeft},
+      {str(""), Event::ArrowRight}, {str(""), Event::ArrowLeft},
-      {str("\x1B[H"), Event::Home},       {str("\x1B[F"), Event::End},
+      {str(""), Event::Home},       {str(""), Event::End},
-      /*
 
       // Arrow (application cursor mode)
       {str("\x1BOA"), Event::ArrowUp},
@@ -469,28 +434,24 @@ TEST(Event, Special) {
 
       // Custom:
       {{0}, Event::Custom},
-      */
   };
 
   for (auto test : kTestCase) {
-    auto event_receiver = MakeReceiver<Task>();
+    std::vector<Event> received_events;
-    {
+    auto parser = TerminalInputParser(
-      auto parser = TerminalInputParser(event_receiver->MakeSender());
+        [&](Event event) { received_events.push_back(std::move(event)); });
     for (auto input : test.input) {
       parser.Add(input);
     }
-    }
+    EXPECT_EQ(1, received_events.size());
-    Task received;
+    EXPECT_EQ(received_events[0], test.expected);
-    EXPECT_TRUE(event_receiver->Receive(&received));
-    EXPECT_EQ(std::get<Event>(received), test.expected);
-    EXPECT_FALSE(event_receiver->Receive(&received));
   }
 }
 
 TEST(Event, DeviceControlString) {
-  auto event_receiver = MakeReceiver<Task>();
+  std::vector<Event> received_events;
-  {
+  auto parser = TerminalInputParser(
-    auto parser = TerminalInputParser(event_receiver->MakeSender());
+      [&](Event event) { received_events.push_back(std::move(event)); });
   parser.Add(27);   // ESC
   parser.Add(80);   // P
   parser.Add(49);   // 1
@@ -501,13 +462,10 @@ TEST(Event, DeviceControlString) {
   parser.Add(113);  // q
   parser.Add(27);   // ESC
   parser.Add(92);   // (backslash)
-  }
 
-  Task received;
+  EXPECT_EQ(1, received_events.size());
-  EXPECT_TRUE(event_receiver->Receive(&received));
+  EXPECT_TRUE(received_events[0].is_cursor_shape());
-  EXPECT_TRUE(std::get<Event>(received).is_cursor_shape());
+  EXPECT_EQ(1, received_events[0].cursor_shape());
-  EXPECT_EQ(1, std::get<Event>(received).cursor_shape());
-  EXPECT_FALSE(event_receiver->Receive(&received));
 }
 
 }  // namespace ftxui

src/ftxui/component/terminal_input_parser_test_fuzzer.cpp

@@ -1,21 +1,16 @@
 // Copyright 2021 Arthur Sonzogni. All rights reserved.
 // Use of this source code is governed by the MIT license that can be found in
 // the LICENSE file.
+#include <cstddef>
+#include <ftxui/component/event.hpp>
 #include "ftxui/component/terminal_input_parser.hpp"
 
 extern "C" int LLVMFuzzerTestOneInput(const char* data, size_t size) {
   using namespace ftxui;
-  auto event_receiver = MakeReceiver<Task>();
+  auto parser = TerminalInputParser([&](Event) {});
-  {
-    auto parser = TerminalInputParser(event_receiver->MakeSender());
   for (size_t i = 0; i < size; ++i) {
     parser.Add(data[i]);
   }
-  }
 
-  Task received;
-  while (event_receiver->Receive(&received)) {
-    // Do nothing.
-  }
   return 0;  // Non-zero return values are reserved for future use.
 }