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1d2d65504a
Summary: This replaces the format member search, which was quite complicated, with a more direct approach to detecting whether a class should be formatted using the format-member method. Instead we use a special type llvm::format_adapter, which every adapter must inherit from. Then the search can be simply implemented with the is_base_of type trait. Aside from the simplification, I like this way more because it makes it more explicit that you are supposed to use this type only for adapter-like formattings, and the other approach (format_provider overloads) should be used as a default (a mistake I made when first trying to use this library). The only slight change in behaviour here is that now choose the format-adapter branch even if the format member invocation will fail to compile (e.g. because it is a non-const member function and we are passing a const adapter), whereas previously we would have gone on to search for format_providers for the type. However, I think that is actually a good thing, as it probably means the programmer did something wrong. Reviewers: zturner, inglorion Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D27679 llvm-svn: 289795
70 lines
1.9 KiB
C++
70 lines
1.9 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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FmtAlign(detail::format_adapter &Adapter, AlignStyle Where, size_t Amount)
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: Adapter(Adapter), Where(Where), Amount(Amount) {}
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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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S.indent(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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S.indent(X);
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S << Item;
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S.indent(PadAmount - X);
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break;
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}
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default:
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S.indent(PadAmount);
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S << Item;
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break;
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}
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}
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};
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}
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#endif
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