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improve nana.filesystem

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This commit is contained in:
Jinhao
2018-12-10 07:22:16 +08:00
parent a4a709346b
commit c09e7b7ba6
6 changed files with 295 additions and 52 deletions
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280
source/filesystem/filesystem.cpp
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@@ -45,7 +45,7 @@
#include <stdlib.h>
#endif
namespace fs = std::experimental::filesystem;
namespace fs = std::filesystem;
namespace nana
{
@@ -117,12 +117,7 @@ namespace nana
if (ftime == ((fs::file_time_type::min)())) return{};
//std::time_t cftime = decltype(ftime)::clock::to_time_t(ftime);
//A workaround for VC2013
using time_point = decltype(ftime);
auto cftime = time_point::clock::to_time_t(ftime);
auto cftime = static_cast<std::time_t>(ftime.time_since_epoch().count());
std::stringstream tm;
tm << std::put_time(std::localtime(&cftime), "%Y-%m-%d, %H:%M:%S");
@@ -209,9 +204,9 @@ namespace nana { namespace experimental { namespace filesystem
//Because of No wide character version of POSIX
#if defined(NANA_POSIX)
const char* splstr = "/";
const char* separators = "/";
#else
const wchar_t* splstr = L"/\\";
const wchar_t* separators = L"/\\";
#endif
//class file_status
@@ -249,13 +244,22 @@ namespace nana { namespace experimental { namespace filesystem
/// true if the path is empty, false otherwise. ??
bool path::empty() const noexcept
{
#if defined(NANA_WINDOWS)
return (::GetFileAttributes(pathstr_.c_str()) == INVALID_FILE_ATTRIBUTES);
#elif defined(NANA_POSIX)
struct stat sta;
return (::stat(pathstr_.c_str(), &sta) == -1);
return pathstr_.empty();
}
bool path::is_absolute() const
{
#ifdef NANA_WINDOWS
return has_root_name() && has_root_directory();
#else
return has_root_directory();
#endif
}
bool path::is_relative() const
{
return !is_absolute();
}
path path::extension() const
{
@@ -277,6 +281,107 @@ namespace nana { namespace experimental { namespace filesystem
return path(pathstr_.substr(pos));
}
bool is_directory_separator(path::value_type ch)
{
return (ch == '/')
#ifdef NANA_WINDOWS
|| (ch == path::preferred_separator)
#endif
;
}
path path::root_name() const
{
auto pos = pathstr_.find_first_not_of(separators);
if (pathstr_.npos != pos)
{
pos = pathstr_.find_first_of(separators, pos + 1);
if (pathstr_.npos != pos)
{
if ((is_directory_separator(pathstr_[0]) && is_directory_separator(pathstr_[1]))
#ifdef NANA_WINDOWS
|| (pathstr_[pos - 1] == ':')
#endif
)
return pathstr_.substr(0, pos);
}
}
return path{};
}
std::size_t root_directory_pos(const path::string_type& str)
{
#ifdef NANA_WINDOWS
// case "c:/"
if (str.size() > 2
&& str[1] == ':'
&& is_directory_separator(str[2])) return 2;
#endif
// case "//"
if (str.size() == 2
&& is_directory_separator(str[0])
&& is_directory_separator(str[1])) return path::string_type::npos;
#ifdef NANA_WINDOWS
// case "\\?\"
if (str.size() > 4
&& is_directory_separator(str[0])
&& is_directory_separator(str[1])
&& str[2] == '?'
&& is_directory_separator(str[3]))
{
auto pos = str.find_first_of(separators, 4);
return pos < str.size() ? pos : str.npos;
}
#endif
// case "//net {/}"
if (str.size() > 3
&& is_directory_separator(str[0])
&& is_directory_separator(str[1])
&& !is_directory_separator(str[2]))
{
auto pos = str.find_first_of(separators, 2);
return pos < str.size() ? pos : str.npos;
}
// case "/"
if (str.size() > 0 && is_directory_separator(str[0])) return 0;
return str.npos;
}
path path::root_directory() const
{
auto pos = root_directory_pos(pathstr_);
return pos == string_type::npos
? path()
: path(pathstr_.substr(pos, 1));
}
path path::root_path() const
{
return root_name().pathstr_ + root_directory().pathstr_;
}
path path::relative_path() const
{
if (!empty())
{
auto pos = root_directory_pos(pathstr_);
pos = pathstr_.find_first_not_of(separators, pos);
if (pathstr_.npos != pos)
return path{ pathstr_.substr(pos) };
}
return{};
}
path path::parent_path() const
{
return{nana_fs::parent_path(pathstr_)};
@@ -310,14 +415,14 @@ namespace nana { namespace experimental { namespace filesystem
path path::filename() const
{
auto pos = pathstr_.find_last_of(splstr);
auto pos = pathstr_.find_last_of(separators);
if (pos != pathstr_.npos)
{
if (pos + 1 == pathstr_.size())
{
value_type tmp[2] = {preferred_separator, 0};
if (pathstr_.npos != pathstr_.find_last_not_of(splstr, pos))
if (pathstr_.npos != pathstr_.find_last_not_of(separators, pos))
tmp[0] = '.';
return{ tmp };
@@ -328,6 +433,19 @@ namespace nana { namespace experimental { namespace filesystem
return{ pathstr_ };
}
void path::clear() noexcept
{
pathstr_.clear();
}
path& path::make_preferred()
{
#ifdef NANA_WINDOWS
std::replace(pathstr_.begin(), pathstr_.end(), L'/', L'\\');
#endif
return *this;
}
path& path::remove_filename()
{
#ifdef NANA_WINDOWS
@@ -418,10 +536,10 @@ namespace nana { namespace experimental { namespace filesystem
if (this == &p)
{
auto other = p.pathstr_;
if ((other.front() != '/') && (other.front() == path::preferred_separator))
if (!is_directory_separator(other.front()))
{
if (!this->pathstr_.empty() && (pathstr_.back() != '/' && pathstr_.back() == path::preferred_separator))
pathstr_.append(path::preferred_separator, 1);
if (!pathstr_.empty() && !is_directory_separator(pathstr_.back()))
pathstr_.append(1, path::preferred_separator);
}
pathstr_ += other;
@@ -429,10 +547,10 @@ namespace nana { namespace experimental { namespace filesystem
else
{
auto & other = p.pathstr_;
if ((other.front() != '/') && (other.front() == path::preferred_separator))
if (!is_directory_separator(other.front()))
{
if (!this->pathstr_.empty() && (pathstr_.back() != '/' && pathstr_.back() == path::preferred_separator))
pathstr_.append(path::preferred_separator, 1);
if (!pathstr_.empty() && !is_directory_separator(pathstr_.back()))
pathstr_.append(1, path::preferred_separator);
}
pathstr_ += p.pathstr_;
@@ -976,5 +1094,123 @@ namespace nana { namespace experimental { namespace filesystem
}//end namespace filesystem
} //end namespace experimental
}//end namespace nana
#if (defined(_MSC_VER) && ((!defined(_MSVC_LANG)) || (_MSVC_LANG < 201703)))
namespace std
{
namespace filesystem
{
path absolute(const path& p)
{
if (p.empty())
return p;
auto abs_base = current_path();
// store expensive to compute values that are needed multiple times
path p_root_name(p.root_name());
path base_root_name(abs_base.root_name());
path p_root_directory(p.root_directory());
if (!p_root_name.empty()) // p.has_root_name()
{
if (p_root_directory.empty()) // !p.has_root_directory()
return p_root_name / abs_base.root_directory()
/ abs_base.relative_path() / p.relative_path();
// p is absolute, so fall through to return p at end of block
}
else if (!p_root_directory.empty()) // p.has_root_directory()
{
#ifdef NANA_POSIX
// POSIX can have root name it it is a network path
if (base_root_name.empty()) // !abs_base.has_root_name()
return p;
#endif
return base_root_name / p;
}
else
return abs_base / p;
return p; // p.is_absolute() is true
}
path absolute(const path& p, std::error_code& err)
{
return absolute(p);
}
path canonical(const path& p, std::error_code* err)
{
path source(p.is_absolute() ? p : absolute(p));
path root(source.root_path());
path result;
std::error_code local_ec;
file_status stat(status(source, local_ec));
if (stat.type() == file_type::not_found)
{
if (nullptr == err)
throw (filesystem_error(
"nana::filesystem::canonical", source,
error_code(static_cast<int>(errc::no_such_file_or_directory), generic_category())));
err->assign(static_cast<int>(errc::no_such_file_or_directory), generic_category());
return result;
}
else if (local_ec)
{
if (nullptr == err)
throw (filesystem_error(
"nana::filesystem::canonical", source, local_ec));
*err = local_ec;
return result;
}
auto tmp_p = source;
std::vector<path> source_elements;
while (tmp_p != root)
{
source_elements.emplace(source_elements.begin(), tmp_p.filename());
tmp_p.remove_filename();
}
result = root;
for(auto & e : source_elements)
{
auto str = e.string();
if("." == str)
continue;
else if(".." == str)
{
if(result != root)
result.remove_filename();
continue;
}
result /= e;
}
if (err)
err->clear();
return result;
}
path canonical(const path& p)
{
return canonical(p, nullptr);
}
path canonical(const path& p, std::error_code& err)
{
return canonical(p, &err);
}
}//end namespace filesystem
}//end namespace std
#endif
#endif