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1 //===- FormatAdapters.h - Formatters for common LLVM types -----*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9
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10 #ifndef LLVM_SUPPORT_FORMATCOMMON_H
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11 #define LLVM_SUPPORT_FORMATCOMMON_H
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12
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13 #include "llvm/ADT/SmallString.h"
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14 #include "llvm/Support/FormatVariadicDetails.h"
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15 #include "llvm/Support/raw_ostream.h"
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16
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17 namespace llvm {
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18 enum class AlignStyle { Left, Center, Right };
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19
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20 struct FmtAlign {
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21 detail::format_wrapper &Wrapper;
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22 AlignStyle Where;
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23 size_t Amount;
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24
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25 FmtAlign(detail::format_wrapper &Wrapper, AlignStyle Where, size_t Amount)
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26 : Wrapper(Wrapper), Where(Where), Amount(Amount) {}
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27
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28 void format(raw_ostream &S, StringRef Options) {
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29 // If we don't need to align, we can format straight into the underlying
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30 // stream. Otherwise we have to go through an intermediate stream first
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31 // in order to calculate how long the output is so we can align it.
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32 // TODO: Make the format method return the number of bytes written, that
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33 // way we can also skip the intermediate stream for left-aligned output.
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34 if (Amount == 0) {
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35 Wrapper.format(S, Options);
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36 return;
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37 }
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38 SmallString<64> Item;
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39 raw_svector_ostream Stream(Item);
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40
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41 Wrapper.format(Stream, Options);
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42 if (Amount <= Item.size()) {
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43 S << Item;
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44 return;
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45 }
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46
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47 size_t PadAmount = Amount - Item.size();
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48 switch (Where) {
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49 case AlignStyle::Left:
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50 S << Item;
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51 S.indent(PadAmount);
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52 break;
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53 case AlignStyle::Center: {
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54 size_t X = PadAmount / 2;
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55 S.indent(X);
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56 S << Item;
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57 S.indent(PadAmount - X);
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58 break;
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59 }
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60 default:
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61 S.indent(PadAmount);
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62 S << Item;
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63 break;
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64 }
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65 }
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66 };
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67 }
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68
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69 #endif |
