1 //===- CodeExpander.h - Expand variables in a string ------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 /// \file Expand the variables in a string. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #ifndef LLVM_UTILS_TABLEGEN_CODEEXPANDER_H 14 #define LLVM_UTILS_TABLEGEN_CODEEXPANDER_H 15 16 #include "llvm/ADT/ArrayRef.h" 17 #include "llvm/ADT/StringRef.h" 18 19 namespace llvm { 20 class CodeExpansions; 21 class SMLoc; 22 class raw_ostream; 23 24 /// Emit the given code with all '${foo}' placeholders expanded to their 25 /// replacements. 26 /// 27 /// It's an error to use an undefined expansion and expansion-like output that 28 /// needs to be emitted verbatim can be escaped as '\${foo}' 29 /// 30 /// The emitted code can be given a custom indent to enable both indentation by 31 /// an arbitrary amount of whitespace and emission of the code as a comment. 32 class CodeExpander { 33 StringRef Code; 34 const CodeExpansions &Expansions; 35 const ArrayRef<SMLoc> &Loc; 36 bool ShowExpansions; 37 StringRef Indent; 38 39 public: 40 CodeExpander(StringRef Code, const CodeExpansions &Expansions, 41 const ArrayRef<SMLoc> &Loc, bool ShowExpansions, 42 StringRef Indent = " ") Code(Code)43 : Code(Code), Expansions(Expansions), Loc(Loc), 44 ShowExpansions(ShowExpansions), Indent(Indent) {} 45 46 void emit(raw_ostream &OS) const; 47 }; 48 49 inline raw_ostream &operator<<(raw_ostream &OS, const CodeExpander &Expander) { 50 Expander.emit(OS); 51 return OS; 52 } 53 } // end namespace llvm 54 55 #endif // ifndef LLVM_UTILS_TABLEGEN_CODEEXPANDER_H 56