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  1. //===- FormatAdapters.h - Formatters for common LLVM types -----*- C++ -*-===//
  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_SUPPORT_FORMATADAPTERS_H
  10. #define LLVM_SUPPORT_FORMATADAPTERS_H
  11.  
  12. #include "llvm/ADT/StringRef.h"
  13. #include "llvm/Support/Error.h"
  14. #include "llvm/Support/FormatCommon.h"
  15. #include "llvm/Support/FormatVariadicDetails.h"
  16. #include "llvm/Support/raw_ostream.h"
  17.  
  18. namespace llvm {
  19. template <typename T> class FormatAdapter : public detail::format_adapter {
  20. protected:
  21.   explicit FormatAdapter(T &&Item) : Item(std::forward<T>(Item)) {}
  22.  
  23.   T Item;
  24. };
  25.  
  26. namespace detail {
  27. template <typename T> class AlignAdapter final : public FormatAdapter<T> {
  28.   AlignStyle Where;
  29.   size_t Amount;
  30.   char Fill;
  31.  
  32. public:
  33.   AlignAdapter(T &&Item, AlignStyle Where, size_t Amount, char Fill)
  34.       : FormatAdapter<T>(std::forward<T>(Item)), Where(Where), Amount(Amount),
  35.         Fill(Fill) {}
  36.  
  37.   void format(llvm::raw_ostream &Stream, StringRef Style) override {
  38.     auto Adapter = detail::build_format_adapter(std::forward<T>(this->Item));
  39.     FmtAlign(Adapter, Where, Amount, Fill).format(Stream, Style);
  40.   }
  41. };
  42.  
  43. template <typename T> class PadAdapter final : public FormatAdapter<T> {
  44.   size_t Left;
  45.   size_t Right;
  46.  
  47. public:
  48.   PadAdapter(T &&Item, size_t Left, size_t Right)
  49.       : FormatAdapter<T>(std::forward<T>(Item)), Left(Left), Right(Right) {}
  50.  
  51.   void format(llvm::raw_ostream &Stream, StringRef Style) override {
  52.     auto Adapter = detail::build_format_adapter(std::forward<T>(this->Item));
  53.     Stream.indent(Left);
  54.     Adapter.format(Stream, Style);
  55.     Stream.indent(Right);
  56.   }
  57. };
  58.  
  59. template <typename T> class RepeatAdapter final : public FormatAdapter<T> {
  60.   size_t Count;
  61.  
  62. public:
  63.   RepeatAdapter(T &&Item, size_t Count)
  64.       : FormatAdapter<T>(std::forward<T>(Item)), Count(Count) {}
  65.  
  66.   void format(llvm::raw_ostream &Stream, StringRef Style) override {
  67.     auto Adapter = detail::build_format_adapter(std::forward<T>(this->Item));
  68.     for (size_t I = 0; I < Count; ++I) {
  69.       Adapter.format(Stream, Style);
  70.     }
  71.   }
  72. };
  73.  
  74. class ErrorAdapter : public FormatAdapter<Error> {
  75. public:
  76.   ErrorAdapter(Error &&Item) : FormatAdapter(std::move(Item)) {}
  77.   ErrorAdapter(ErrorAdapter &&) = default;
  78.   ~ErrorAdapter() { consumeError(std::move(Item)); }
  79.   void format(llvm::raw_ostream &Stream, StringRef Style) override {
  80.     Stream << Item;
  81.   }
  82. };
  83. }
  84.  
  85. template <typename T>
  86. detail::AlignAdapter<T> fmt_align(T &&Item, AlignStyle Where, size_t Amount,
  87.                                   char Fill = ' ') {
  88.   return detail::AlignAdapter<T>(std::forward<T>(Item), Where, Amount, Fill);
  89. }
  90.  
  91. template <typename T>
  92. detail::PadAdapter<T> fmt_pad(T &&Item, size_t Left, size_t Right) {
  93.   return detail::PadAdapter<T>(std::forward<T>(Item), Left, Right);
  94. }
  95.  
  96. template <typename T>
  97. detail::RepeatAdapter<T> fmt_repeat(T &&Item, size_t Count) {
  98.   return detail::RepeatAdapter<T>(std::forward<T>(Item), Count);
  99. }
  100.  
  101. // llvm::Error values must be consumed before being destroyed.
  102. // Wrapping an error in fmt_consume explicitly indicates that the formatv_object
  103. // should take ownership and consume it.
  104. inline detail::ErrorAdapter fmt_consume(Error &&Item) {
  105.   return detail::ErrorAdapter(std::move(Item));
  106. }
  107. }
  108.  
  109. #endif
  110.