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/*
* Copyright 2018 Google
*
* 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.
*/
#include "Firestore/core/src/firebase/firestore/util/path.h"
#include "absl/strings/ascii.h"
#include "absl/strings/string_view.h"
namespace firebase {
namespace firestore {
namespace util {
namespace {
static constexpr absl::string_view::size_type npos = absl::string_view::npos;
/** Returns the given path with its leading drive letter removed. */
inline absl::string_view StripDriveLetter(absl::string_view path) {
#if defined(_WIN32)
if (path.size() >= 2 && path[1] == ':' && absl::ascii_isalpha(path[0])) {
return path.substr(2);
}
return path;
#else
return path;
#endif // defined(_WIN32)
}
/** Returns true if the given character is a pathname separator. */
inline bool IsSeparator(char c) {
#if defined(_WIN32)
return c == '/' || c == '\\';
#else
return c == '/';
#endif // defined(_WIN32)
}
} // namespace
absl::string_view Path::Basename(absl::string_view pathname) {
size_t slash = pathname.find_last_of('/');
if (slash == npos) {
// No path separator found => the whole string.
return pathname;
}
// Otherwise everything after the slash is the basename (even if empty string)
return pathname.substr(slash + 1);
}
absl::string_view Path::Dirname(absl::string_view pathname) {
size_t last_slash = pathname.find_last_of('/');
if (last_slash == npos) {
// No path separator found => empty string. Conformance with POSIX would
// have us return "." here.
return pathname.substr(0, 0);
}
// Collapse runs of slashes.
size_t nonslash = pathname.find_last_not_of('/', last_slash);
if (nonslash == npos) {
// All characters preceding the last path separator are slashes
return pathname.substr(0, 1);
}
last_slash = nonslash + 1;
// Otherwise everything up to the slash is the parent directory
return pathname.substr(0, last_slash);
}
bool Path::IsAbsolute(absl::string_view path) {
path = StripDriveLetter(path);
return !path.empty() && IsSeparator(path.front());
}
void Path::JoinAppend(std::string* base, absl::string_view path) {
if (IsAbsolute(path)) {
base->assign(path.data(), path.size());
} else {
size_t nonslash = base->find_last_not_of('/');
if (nonslash != npos) {
base->resize(nonslash + 1);
base->push_back('/');
}
// If path started with a slash we'd treat it as absolute above
base->append(path.data(), path.size());
}
}
} // namespace util
} // namespace firestore
} // namespace firebase
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