79 lines
2.2 KiB
C++
79 lines
2.2 KiB
C++
//===- FormatCommon.h - Formatters for common LLVM types --------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_FORMATCOMMON_H
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#define LLVM_SUPPORT_FORMATCOMMON_H
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Support/FormatVariadicDetails.h"
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#include "llvm/Support/raw_ostream.h"
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namespace llvm {
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enum class AlignStyle { Left, Center, Right };
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/// Helper class to format to a \p Width wide field, with alignment \p Where
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/// within that field.
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struct FmtAlign {
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support::detail::format_adapter &Adapter;
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AlignStyle Where;
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unsigned Width;
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char Fill;
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FmtAlign(support::detail::format_adapter &Adapter, AlignStyle Where,
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unsigned Width, char Fill = ' ')
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: Adapter(Adapter), Where(Where), Width(Width), Fill(Fill) {}
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void format(raw_ostream &S, StringRef Options) {
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// If we don't need to align, we can format straight into the underlying
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// stream. Otherwise we have to go through an intermediate stream first
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// in order to calculate how long the output is so we can align it.
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// TODO: Make the format method return the number of bytes written, that
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// way we can also skip the intermediate stream for left-aligned output.
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if (Width == 0) {
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Adapter.format(S, Options);
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return;
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}
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SmallString<64> Item;
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raw_svector_ostream Stream(Item);
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Adapter.format(Stream, Options);
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if (Width <= Item.size()) {
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S << Item;
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return;
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}
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unsigned PadAmount = Width - static_cast<unsigned>(Item.size());
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switch (Where) {
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case AlignStyle::Left:
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S << Item;
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fill(S, PadAmount);
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break;
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case AlignStyle::Center: {
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unsigned X = PadAmount / 2;
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fill(S, X);
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S << Item;
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fill(S, PadAmount - X);
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break;
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}
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default:
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fill(S, PadAmount);
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S << Item;
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break;
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}
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}
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private:
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void fill(llvm::raw_ostream &S, unsigned Count) {
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for (unsigned I = 0; I < Count; ++I)
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S << Fill;
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}
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};
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}
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#endif
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