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//
// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#ifndef ABSL_STRINGS_STR_JOIN_H_
#define ABSL_STRINGS_STR_JOIN_H_
#include <string>
#include "third_party/absl/strings/string_view.h"
namespace absl {
namespace {
template <typename T>
inline size_t Itoa(T val, char *s) {
char *org = s;
if (val < 0) {
*s++ = '-';
val = -val;
}
char *t = s;
T mod = 0;
while (val) {
mod = val % 10;
*t++ = static_cast<char>(mod) + '0';
val /= 10;
}
if (s == t) {
*t++ = '0';
}
*t = '\0';
std::reverse(s, t);
return static_cast<size_t>(t - org);
}
} // namespace
inline std::string StrJoin(const std::vector<std::string> &tokens,
absl::string_view delim) {
std::string result;
if (!tokens.empty()) {
result.append(tokens[0]);
}
for (size_t i = 1; i < tokens.size(); ++i) {
result.append(delim.data(), delim.size());
result.append(tokens[i]);
}
return result;
}
inline std::string StrJoin(const std::vector<absl::string_view> &tokens,
absl::string_view delim) {
std::string result;
if (!tokens.empty()) {
result.append(tokens[0].data(), tokens[0].size());
}
for (size_t i = 1; i < tokens.size(); ++i) {
result.append(delim.data(), delim.size());
result.append(tokens[i].data(), tokens[i].size());
}
return result;
}
inline std::string StrJoin(const std::vector<int> &tokens,
absl::string_view delim) {
std::string result;
char buf[32];
if (!tokens.empty()) {
const size_t len = Itoa(tokens[0], buf);
result.append(buf, len);
}
for (size_t i = 1; i < tokens.size(); ++i) {
result.append(delim.data(), delim.size());
const size_t len = Itoa(tokens[i], buf);
result.append(buf, len);
}
return result;
}
} // namespace absl
#endif // ABSL_STRINGS_STR_CAT_H_
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