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94cee8ef5e
Previously if you used fmt_align(7, Center) you would get the output ' 7 '. It may be desirable for the user to specify the fill character though, for example producing '---7---'. This patch adds that. llvm-svn: 305449
78 lines
2.0 KiB
C++
78 lines
2.0 KiB
C++
//===- FormatAdapters.h - Formatters for common LLVM types -----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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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struct FmtAlign {
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detail::format_adapter &Adapter;
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AlignStyle Where;
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size_t Amount;
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char Fill;
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FmtAlign(detail::format_adapter &Adapter, AlignStyle Where, size_t Amount,
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char Fill = ' ')
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: Adapter(Adapter), Where(Where), Amount(Amount), 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 (Amount == 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 (Amount <= Item.size()) {
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S << Item;
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return;
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}
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size_t PadAmount = Amount - 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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size_t 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, uint32_t Count) {
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for (uint32_t 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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