1 //===- FormatAdapters.h - Formatters for common LLVM types -----*- C++ -*-===// 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_SUPPORT_FORMATCOMMON_H 11 #define LLVM_SUPPORT_FORMATCOMMON_H 12 13 #include "llvm/ADT/SmallString.h" 14 #include "llvm/Support/FormatVariadicDetails.h" 15 #include "llvm/Support/raw_ostream.h" 16 17 namespace llvm { 18 enum class AlignStyle { Left, Center, Right }; 19 20 struct FmtAlign { 21 detail::format_adapter &Adapter; 22 AlignStyle Where; 23 size_t Amount; 24 25 FmtAlign(detail::format_adapter &Adapter, AlignStyle Where, size_t Amount) 26 : Adapter(Adapter), Where(Where), Amount(Amount) {} 27 28 void format(raw_ostream &S, StringRef Options) { 29 // If we don't need to align, we can format straight into the underlying 30 // stream. Otherwise we have to go through an intermediate stream first 31 // in order to calculate how long the output is so we can align it. 32 // TODO: Make the format method return the number of bytes written, that 33 // way we can also skip the intermediate stream for left-aligned output. 34 if (Amount == 0) { 35 Adapter.format(S, Options); 36 return; 37 } 38 SmallString<64> Item; 39 raw_svector_ostream Stream(Item); 40 41 Adapter.format(Stream, Options); 42 if (Amount <= Item.size()) { 43 S << Item; 44 return; 45 } 46 47 size_t PadAmount = Amount - Item.size(); 48 switch (Where) { 49 case AlignStyle::Left: 50 S << Item; 51 S.indent(PadAmount); 52 break; 53 case AlignStyle::Center: { 54 size_t X = PadAmount / 2; 55 S.indent(X); 56 S << Item; 57 S.indent(PadAmount - X); 58 break; 59 } 60 default: 61 S.indent(PadAmount); 62 S << Item; 63 break; 64 } 65 } 66 }; 67 } 68 69 #endif 70
