56 lines
1.8 KiB
C++
56 lines
1.8 KiB
C++
//===- CodeExpander.h - Expand variables in a string ----------------------===//
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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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#include "llvm/Support/SMLoc.h"
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namespace llvm {
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class CodeExpansions;
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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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