fa3d789df1
Refactor of the llvm-tblgen source into: - a "Basic" library, which contains the bare minimum utilities to build `llvm-min-tablegen` - a "Common" library which contains all of the helpers for TableGen backends. Such helpers can be shared by more than one backend, and even unit tested (e.g. CodeExpander is, maybe we can add more over time) Fixes #80647
56 lines
1.8 KiB
C++
56 lines
1.8 KiB
C++
//===- CodeExpander.h - Expand variables in a string ------------*- 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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//
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/// \file Expand the variables in a string.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_UTILS_TABLEGEN_CODEEXPANDER_H
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#define LLVM_UTILS_TABLEGEN_CODEEXPANDER_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/StringRef.h"
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namespace llvm {
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class CodeExpansions;
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class SMLoc;
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class raw_ostream;
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/// Emit the given code with all '${foo}' placeholders expanded to their
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/// replacements.
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///
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/// It's an error to use an undefined expansion and expansion-like output that
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/// needs to be emitted verbatim can be escaped as '\${foo}'
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///
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/// The emitted code can be given a custom indent to enable both indentation by
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/// an arbitrary amount of whitespace and emission of the code as a comment.
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class CodeExpander {
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StringRef Code;
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const CodeExpansions &Expansions;
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const ArrayRef<SMLoc> &Loc;
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bool ShowExpansions;
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StringRef Indent;
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public:
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CodeExpander(StringRef Code, const CodeExpansions &Expansions,
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const ArrayRef<SMLoc> &Loc, bool ShowExpansions,
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StringRef Indent = " ")
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: Code(Code), Expansions(Expansions), Loc(Loc),
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ShowExpansions(ShowExpansions), Indent(Indent) {}
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void emit(raw_ostream &OS) const;
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};
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inline raw_ostream &operator<<(raw_ostream &OS, const CodeExpander &Expander) {
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Expander.emit(OS);
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return OS;
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}
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} // end namespace llvm
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#endif // ifndef LLVM_UTILS_TABLEGEN_CODEEXPANDER_H
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