llvm/tools/llvm-cov/RenderingSupport.h

   1 //===- RenderingSupport.h - output stream rendering support functions  ----===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef LLVM_COV_RENDERINGSUPPORT_H
  10 #define LLVM_COV_RENDERINGSUPPORT_H
  11
  12 #include "llvm/Support/raw_ostream.h"
  13 #include <utility>
  14
  15 namespace llvm {
  16
  17 /// A helper class that resets the output stream's color if needed
  18 /// when destroyed.
  19 class ColoredRawOstream {
  20   ColoredRawOstream(const ColoredRawOstream &OS) = delete;
  21
  22 public:
  23   raw_ostream &OS;
  24   bool IsColorUsed;
  25
  26   ColoredRawOstream(raw_ostream &OS, bool IsColorUsed)
  27       : OS(OS), IsColorUsed(IsColorUsed) {}
  28
  29   ColoredRawOstream(ColoredRawOstream &&Other)
  30       : OS(Other.OS), IsColorUsed(Other.IsColorUsed) {
  31     // Reset the other IsColorUsed so that the other object won't reset the
  32     // color when destroyed.
  33     Other.IsColorUsed = false;
  34   }
  35
  36   ~ColoredRawOstream() {
  37     if (IsColorUsed)
  38       OS.resetColor();
  39   }
  40 };
  41
  42 template <typename T>
  43 inline raw_ostream &operator<<(const ColoredRawOstream &OS, T &&Value) {
  44   return OS.OS << std::forward<T>(Value);
  45 }
  46
  47 /// Change the color of the output stream if the `IsColorUsed` flag
  48 /// is true. Returns an object that resets the color when destroyed.
  49 inline ColoredRawOstream colored_ostream(raw_ostream &OS,
  50                                          raw_ostream::Colors Color,
  51                                          bool IsColorUsed = true,
  52                                          bool Bold = false, bool BG = false) {
  53   if (IsColorUsed)
  54     OS.changeColor(Color, Bold, BG);
  55   return ColoredRawOstream(OS, IsColorUsed);
  56 }
  57
  58 } // namespace llvm
  59
  60 #endif // LLVM_COV_RENDERINGSUPPORT_H