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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 14 | pmbaty | 1 | //===- FormatCommon.h - Formatters for common LLVM types --------*- C++ -*-===// |
| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |||
| 9 | #ifndef LLVM_SUPPORT_FORMATCOMMON_H |
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| 10 | #define LLVM_SUPPORT_FORMATCOMMON_H |
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| 11 | |||
| 12 | #include "llvm/ADT/SmallString.h" |
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| 13 | #include "llvm/Support/FormatVariadicDetails.h" |
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| 14 | #include "llvm/Support/raw_ostream.h" |
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| 15 | |||
| 16 | namespace llvm { |
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| 17 | enum class AlignStyle { Left, Center, Right }; |
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| 18 | |||
| 19 | struct FmtAlign { |
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| 20 | detail::format_adapter &Adapter; |
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| 21 | AlignStyle Where; |
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| 22 | size_t Amount; |
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| 23 | char Fill; |
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| 24 | |||
| 25 | FmtAlign(detail::format_adapter &Adapter, AlignStyle Where, size_t Amount, |
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| 26 | char Fill = ' ') |
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| 27 | : Adapter(Adapter), Where(Where), Amount(Amount), Fill(Fill) {} |
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| 28 | |||
| 29 | void format(raw_ostream &S, StringRef Options) { |
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| 30 | // If we don't need to align, we can format straight into the underlying |
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| 31 | // stream. Otherwise we have to go through an intermediate stream first |
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| 32 | // in order to calculate how long the output is so we can align it. |
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| 33 | // TODO: Make the format method return the number of bytes written, that |
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| 34 | // way we can also skip the intermediate stream for left-aligned output. |
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| 35 | if (Amount == 0) { |
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| 36 | Adapter.format(S, Options); |
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| 37 | return; |
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| 38 | } |
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| 39 | SmallString<64> Item; |
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| 40 | raw_svector_ostream Stream(Item); |
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| 41 | |||
| 42 | Adapter.format(Stream, Options); |
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| 43 | if (Amount <= Item.size()) { |
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| 44 | S << Item; |
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| 45 | return; |
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| 46 | } |
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| 47 | |||
| 48 | size_t PadAmount = Amount - Item.size(); |
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| 49 | switch (Where) { |
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| 50 | case AlignStyle::Left: |
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| 51 | S << Item; |
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| 52 | fill(S, PadAmount); |
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| 53 | break; |
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| 54 | case AlignStyle::Center: { |
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| 55 | size_t X = PadAmount / 2; |
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| 56 | fill(S, X); |
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| 57 | S << Item; |
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| 58 | fill(S, PadAmount - X); |
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| 59 | break; |
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| 60 | } |
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| 61 | default: |
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| 62 | fill(S, PadAmount); |
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| 63 | S << Item; |
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| 64 | break; |
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| 65 | } |
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| 66 | } |
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| 67 | |||
| 68 | private: |
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| 69 | void fill(llvm::raw_ostream &S, uint32_t Count) { |
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| 70 | for (uint32_t I = 0; I < Count; ++I) |
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| 71 | S << Fill; |
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| 72 | } |
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| 73 | }; |
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| 74 | } |
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| 75 | |||
| 76 | #endif |