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/**
* @file lldiriterator.cpp
* @brief Iterator through directory entries matching the search pattern.
*
* $LicenseInfo:firstyear=2010&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#include "lldiriterator.h"
#include <boost/filesystem.hpp>
#include <boost/regex.hpp>
namespace fs = boost::filesystem;
static std::string glob_to_regex(const std::string& glob);
class LLDirIterator::Impl
{
public:
Impl(const std::string &dirname, const std::string &mask);
~Impl();
bool next(std::string &fname);
private:
boost::regex mFilterExp;
fs::directory_iterator mIter;
bool mIsValid;
};
LLDirIterator::Impl::Impl(const std::string &dirname, const std::string &mask)
: mIsValid(false)
{
fs::path dir_path(dirname);
bool is_dir = false;
// Check if path is a directory.
try
{
is_dir = fs::is_directory(dir_path);
}
catch (const fs::filesystem_error& e)
{
llwarns << e.what() << llendl;
return;
}
if (!is_dir)
{
llwarns << "Invalid path: \"" << dir_path.string() << "\"" << llendl;
return;
}
// Initialize the directory iterator for the given path.
try
{
mIter = fs::directory_iterator(dir_path);
}
catch (const fs::filesystem_error& e)
{
llwarns << e.what() << llendl;
return;
}
// Convert the glob mask to a regular expression
std::string exp = glob_to_regex(mask);
// Initialize boost::regex with the expression converted from
// the glob mask.
// An exception is thrown if the expression is not valid.
try
{
mFilterExp.assign(exp);
}
catch (boost::regex_error& e)
{
llwarns << "\"" << exp << "\" is not a valid regular expression: "
<< e.what() << llendl;
return;
}
mIsValid = true;
}
LLDirIterator::Impl::~Impl()
{
}
bool LLDirIterator::Impl::next(std::string &fname)
{
fname = "";
if (!mIsValid)
{
llwarns << "The iterator is not correctly initialized." << llendl;
return false;
}
fs::directory_iterator end_itr; // default construction yields past-the-end
bool found = false;
while (mIter != end_itr && !found)
{
boost::smatch match;
std::string name = mIter->path().filename().string();
if (found = boost::regex_match(name, match, mFilterExp))
{
fname = name;
}
++mIter;
}
return found;
}
/**
Converts the incoming glob into a regex. This involves
converting incoming glob expressions to regex equivilents and
at the same time, escaping any regex meaningful characters which
do not have glob meaning, i.e.
.()+|^$
in the input.
*/
std::string glob_to_regex(const std::string& glob)
{
std::string regex;
regex.reserve(glob.size()<<1);
S32 braces = 0;
bool escaped = false;
bool square_brace_open = false;
for (std::string::const_iterator i = glob.begin(); i != glob.end(); ++i)
{
char c = *i;
switch (c)
{
case '*':
if (glob.begin() == i)
{
regex+="[^.].*";
}
else
{
regex+= escaped ? "*" : ".*";
}
break;
case '?':
regex+= escaped ? '?' : '.';
break;
case '{':
braces++;
regex+='(';
break;
case '}':
if (!braces)
{
llerrs << "glob_to_regex: Closing brace without an equivalent opening brace: " << glob << llendl;
}
regex+=')';
braces--;
break;
case ',':
regex+= braces ? '|' : c;
break;
case '!':
regex+= square_brace_open ? '^' : c;
break;
case '.': // This collection have different regex meaning
case '^': // and so need escaping.
case '(':
case ')':
case '+':
case '|':
case '$':
regex += '\\';
default:
regex += c;
break;
}
escaped = ('\\' == c);
square_brace_open = ('[' == c);
}
if (braces)
{
llerrs << "glob_to_regex: Unterminated brace expression: " << glob << llendl;
}
return regex;
}
LLDirIterator::LLDirIterator(const std::string &dirname, const std::string &mask)
{
mImpl = new Impl(dirname, mask);
}
LLDirIterator::~LLDirIterator()
{
delete mImpl;
}
bool LLDirIterator::next(std::string &fname)
{
return mImpl->next(fname);
}
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