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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef TOOLS_GN_STRING_UTILS_H_
#define TOOLS_GN_STRING_UTILS_H_
#include "base/strings/string_piece.h"
class Err;
class Scope;
class Token;
class Value;
inline std::string operator+(const std::string& a, const base::StringPiece& b) {
std::string ret;
ret.reserve(a.size() + b.size());
ret.assign(a);
ret.append(b.data(), b.size());
return ret;
}
inline std::string operator+(const base::StringPiece& a, const std::string& b) {
std::string ret;
ret.reserve(a.size() + b.size());
ret.assign(a.data(), a.size());
ret.append(b);
return ret;
}
// Unescapes and expands variables in the given literal, writing the result
// to the given value. On error, sets |err| and returns false.
bool ExpandStringLiteral(Scope* scope,
const Token& literal,
Value* result,
Err* err);
// Removes the given prefix from the string. Asserts if the string does
// not have the given prefix.
//
// Note: could potentially return a StringPiece into the str.
std::string RemovePrefix(const std::string& str, const std::string& prefix);
// Appends the given string piece to the given string. This avoids an
// intermediate copy.
inline void AppendStringPiece(std::string* dest,
const base::StringPiece& piece) {
dest->append(piece.data(), piece.size());
}
// Removes the trailing slash from the given string. This asserts that either
// the string is empty or it ends with a slash (normally used to process
// directories).
void TrimTrailingSlash(std::string* str);
#endif // TOOLS_GN_STRING_UTILS_H_
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