tools/llvm-cov/RenderingSupport.h

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