[dart:io] Move Platform.ansiSupported to {Stdin,Stdout}.supportsAnsiEscapes

runtime/bin/stdio_win.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #if !defined(DART_IO_DISABLED)
 
 #include "platform/globals.h"
 #if defined(HOST_OS_WINDOWS)
 
 #include "bin/stdio.h"
 
+// These are not always defined in the header files. See:
+// https://msdn.microsoft.com/en-us/library/windows/desktop/ms686033(v=vs.85).aspx
+#ifndef ENABLE_VIRTUAL_TERMINAL_INPUT
+#define ENABLE_VIRTUAL_TERMINAL_INPUT 0x0200
+#endif
+
+#ifndef ENABLE_VIRTUAL_TERMINAL_PROCESSING
+#define ENABLE_VIRTUAL_TERMINAL_PROCESSING 0x0004
+#endif
+
 namespace dart {
 namespace bin {
 
 bool Stdin::ReadByte(int* byte) {
   HANDLE h = GetStdHandle(STD_INPUT_HANDLE);
   uint8_t buffer[1];
   DWORD read = 0;
   BOOL success = ReadFile(h, buffer, 1, &read, NULL);
   if (!success && (GetLastError() != ERROR_BROKEN_PIPE)) {
     return false;
@@ skipping 48 matching lines @@
   }
   if (enabled) {
     mode |= ENABLE_LINE_INPUT;
   } else {
     mode &= ~ENABLE_LINE_INPUT;
   }
   return SetConsoleMode(h, mode);
 }
 
 
+bool Stdin::AnsiSupported(bool* supported) {
+  HANDLE h = GetStdHandle(STD_INPUT_HANDLE);
+  if (h == INVALID_HANDLE_VALUE) {
+    return false;
+  }
+  DWORD mode;
+  if (!GetConsoleMode(h, &mode)) {
+    return false;
+  }
+  *supported = (mode & ENABLE_VIRTUAL_TERMINAL_INPUT) != 0;
+  return true;
+}
+
+
 bool Stdout::GetTerminalSize(intptr_t fd, int size[2]) {
   HANDLE h;
   if (fd == 1) {
     h = GetStdHandle(STD_OUTPUT_HANDLE);
   } else {
     h = GetStdHandle(STD_ERROR_HANDLE);
   }
   CONSOLE_SCREEN_BUFFER_INFO info;
   if (!GetConsoleScreenBufferInfo(h, &info)) {
     return false;
   }
   size[0] = info.srWindow.Right - info.srWindow.Left + 1;
   size[1] = info.srWindow.Bottom - info.srWindow.Top + 1;
   return true;
 }
 
+
+bool Stdout::AnsiSupported(intptr_t fd, bool* supported) {
+  HANDLE h;
+  if (fd == 1) {
+    h = GetStdHandle(STD_OUTPUT_HANDLE);
+  } else {
+    h = GetStdHandle(STD_ERROR_HANDLE);
+  }
+  if (h == INVALID_HANDLE_VALUE) {
+    return false;
+  }
+  DWORD mode;
+  if (!GetConsoleMode(h, &mode)) {
+    return false;
+  }
+  *supported = (mode | ENABLE_VIRTUAL_TERMINAL_PROCESSING) != 0;
+  return true;
+}
+
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(HOST_OS_WINDOWS)
 
 #endif  // !defined(DART_IO_DISABLED)