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