1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef TOOLS_GN_STRING_UTILS_H_ 6 #define TOOLS_GN_STRING_UTILS_H_ 7 8 #include "base/strings/string_piece.h" 9 10 class Err; 11 class Scope; 12 class Token; 13 class Value; 14 15 inline std::string operator+(const std::string& a, const base::StringPiece& b) { 16 std::string ret; 17 ret.reserve(a.size() + b.size()); 18 ret.assign(a); 19 ret.append(b.data(), b.size()); 20 return ret; 21 } 22 23 inline std::string operator+(const base::StringPiece& a, const std::string& b) { 24 std::string ret; 25 ret.reserve(a.size() + b.size()); 26 ret.assign(a.data(), a.size()); 27 ret.append(b); 28 return ret; 29 } 30 31 // Unescapes and expands variables in the given literal, writing the result 32 // to the given value. On error, sets |err| and returns false. 33 bool ExpandStringLiteral(Scope* scope, 34 const Token& literal, 35 Value* result, 36 Err* err); 37 38 // Removes the given prefix from the string. Asserts if the string does 39 // not have the given prefix. 40 // 41 // Note: could potentially return a StringPiece into the str. 42 std::string RemovePrefix(const std::string& str, const std::string& prefix); 43 44 // Appends the given string piece to the given string. This avoids an 45 // intermediate copy. 46 inline void AppendStringPiece(std::string* dest, 47 const base::StringPiece& piece) { 48 dest->append(piece.data(), piece.size()); 49 } 50 51 #endif // TOOLS_GN_STRING_UTILS_H_ 52
