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#include "tensorflow/core/lib/io/path.h"
#include "tensorflow/core/lib/strings/strcat.h"
namespace tensorflow {
namespace io {
string JoinPath(StringPiece part1, StringPiece part2) {
string result;
StringPiece paths[2] = {part1, part2};
for (StringPiece path : paths) {
if (path.empty()) continue;
if (result.empty()) {
result = path.ToString();
continue;
}
if (result[result.size() - 1] == '/') {
if (IsAbsolutePath(path)) {
strings::StrAppend(&result, path.substr(1));
} else {
strings::StrAppend(&result, path);
}
} else {
if (IsAbsolutePath(path)) {
strings::StrAppend(&result, path);
} else {
strings::StrAppend(&result, "/", path);
}
}
}
return result;
}
namespace internal {
// Return the parts of the path, split on the final "/". If there is no
// "/" in the path, the first part of the output is empty and the second
// is the input. If the only "/" in the path is the first character, it is
// the first part of the output.
std::pair<StringPiece, StringPiece> SplitPath(StringPiece path) {
auto pos = path.rfind('/');
// Handle the case with no '/' in 'path'.
if (pos == StringPiece::npos)
return std::make_pair(StringPiece(path.data(), 0), path);
// Handle the case with a single leading '/' in 'path'.
if (pos == 0)
return std::make_pair(StringPiece(path.data(), 1),
StringPiece(path.data() + 1, path.size() - 1));
return std::make_pair(
StringPiece(path.data(), pos),
StringPiece(path.data() + pos + 1, path.size() - (pos + 1)));
}
// Return the parts of the basename of path, split on the final ".".
// If there is no "." in the basename or "." is the final character in the
// basename, the second value will be empty.
std::pair<StringPiece, StringPiece> SplitBasename(StringPiece path) {
path = Basename(path);
auto pos = path.rfind('.');
if (pos == StringPiece::npos)
return std::make_pair(path, StringPiece(path.data() + path.size(), 0));
return std::make_pair(
StringPiece(path.data(), pos),
StringPiece(path.data() + pos + 1, path.size() - (pos + 1)));
}
} // namespace internal
bool IsAbsolutePath(StringPiece path) {
return !path.empty() && path[0] == '/';
}
StringPiece Dirname(StringPiece path) {
return internal::SplitPath(path).first;
}
StringPiece Basename(StringPiece path) {
return internal::SplitPath(path).second;
}
StringPiece Extension(StringPiece path) {
return internal::SplitBasename(path).second;
}
} // namespace io
} // namespace tensorflow
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