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//===- CodeExpander.h - Expand variables in a string ----------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
/// \file Expand the variables in a string.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_UTILS_TABLEGEN_CODEEXPANDER_H
#define LLVM_UTILS_TABLEGEN_CODEEXPANDER_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/SMLoc.h"
namespace llvm {
class CodeExpansions;
class raw_ostream;
/// Emit the given code with all '${foo}' placeholders expanded to their
/// replacements.
///
/// It's an error to use an undefined expansion and expansion-like output that
/// needs to be emitted verbatim can be escaped as '\${foo}'
///
/// The emitted code can be given a custom indent to enable both indentation by
/// an arbitrary amount of whitespace and emission of the code as a comment.
class CodeExpander {
StringRef Code;
const CodeExpansions &Expansions;
const ArrayRef<SMLoc> &Loc;
bool ShowExpansions;
StringRef Indent;
public:
CodeExpander(StringRef Code, const CodeExpansions &Expansions,
const ArrayRef<SMLoc> &Loc, bool ShowExpansions,
StringRef Indent = " ")
: Code(Code), Expansions(Expansions), Loc(Loc),
ShowExpansions(ShowExpansions), Indent(Indent) {}
void emit(raw_ostream &OS) const;
};
inline raw_ostream &operator<<(raw_ostream &OS, const CodeExpander &Expander) {
Expander.emit(OS);
return OS;
}
} // end namespace llvm
#endif // ifndef LLVM_UTILS_TABLEGEN_CODEEXPANDER_H
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