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/*************************************************************************
** FilePath.cpp **
** **
** This file is part of dvisvgm -- the DVI to SVG converter **
** Copyright (C) 2005-2013 Martin Gieseking <martin.gieseking@uos.de> **
** **
** This program is free software; you can redistribute it and/or **
** modify it under the terms of the GNU General Public License as **
** published by the Free Software Foundation; either version 3 of **
** the License, or (at your option) any later version. **
** **
** This program 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 General Public License for more details. **
** **
** You should have received a copy of the GNU General Public License **
** along with this program; if not, see <http://www.gnu.org/licenses/>. **
*************************************************************************/
#include <cctype>
#include "FilePath.h"
#include "FileSystem.h"
#include "MessageException.h"
#include "macros.h"
using namespace std;
/** Removes redundant slashes from a given path. */
static string& single_slashes (string &str) {
size_t pos=0;
while ((pos = str.find("//", pos)) != string::npos)
str.replace(pos, 2, "/");
return str;
}
#ifdef __WIN32__
static char strip_drive_letter (string &path) {
char letter = 0;
if (path.length() >= 2 && path[1] == ':' && isalpha(path[0])) {
letter = tolower(path[0]);
path.erase(0, 2);
}
return letter;
}
static char adapt_current_path (string &path, char target_drive) {
if (char current_drive = strip_drive_letter(path)) {
if (target_drive != current_drive) {
if (target_drive == 0)
target_drive = current_drive;
if (path.empty() || path[0] != '/') {
if (FileSystem::chdir((string(1, target_drive) + ":").c_str())) {
path.insert(0, FileSystem::getcwd()+"/");
strip_drive_letter(path);
}
else
throw MessageException("drive " + string(1, target_drive) + ": not accessible");
}
}
}
return target_drive;
}
static void tolower (string &str) {
for (size_t i=0; i < str.length(); ++i)
str[i] = tolower(str[i]);
}
#endif
/** Constructs a FilePath object from a given path. Relative paths are
* relative to the current working directory.
* @param[in] path absolute or relative path to a file or directory */
FilePath::FilePath (const string &path) {
init(path, !FileSystem::isDirectory(path.c_str()), FileSystem::getcwd());
}
/** Constructs a FilePath object.
* @param[in] path absolute or relative path to a file or directory
* @param[in] isfile true if 'path' references a file, false if a directory is referenced
* @param[in] current_dir if 'path' is a relative path expression it will be related to 'current_dir' */
FilePath::FilePath (const string &path, bool isfile, string current_dir) {
init(path, isfile, current_dir);
}
/** Initializes a FilePath object. This method should be called by the constructors only.
* @param[in] path absolute or relative path to a file or directory
* @param[in] isfile true if 'path' references a file, false if a directory is referenced
* @param[in] current_dir if 'path' is a relative path expression it will be related to 'current_dir' */
void FilePath::init (string path, bool isfile, string current_dir) {
single_slashes(path);
single_slashes(current_dir);
#ifdef __WIN32__
tolower(path);
path = FileSystem::adaptPathSeperators(path);
_drive = strip_drive_letter(path);
#endif
if (isfile) {
size_t pos = path.rfind('/');
_fname = path.substr((pos == string::npos) ? 0 : pos+1);
if (pos != string::npos)
path.erase(pos);
else
path.clear();
}
if (current_dir.empty())
current_dir = FileSystem::getcwd();
#ifdef __WIN32__
tolower(current_dir);
_drive = adapt_current_path(current_dir, _drive);
#endif
if (!path.empty()) {
if (path[0] == '/')
current_dir.clear();
else if (current_dir[0] != '/')
current_dir = "/";
else {
FilePath curr(current_dir, false, "/");
current_dir = curr.absolute();
#ifdef __WIN32__
adapt_current_path(current_dir, _drive);
#endif
}
}
path.insert(0, current_dir + "/");
string elem;
FORALL (path, string::const_iterator, it) {
if (*it == '/') {
add(elem);
elem.clear();
}
else
elem += *it;
}
add(elem);
}
/** Adds a location step to the current path. */
void FilePath::add (const string &dir) {
if (dir == ".." && !_dirs.empty())
_dirs.pop_back();
else if (dir.length() > 0 && dir != ".")
_dirs.push_back(dir);
}
/** Returns the suffix of the filename. If FilePath represents the
* location of a directory (and not of a file) an empty string
* is returned. */
string FilePath::suffix () const {
size_t start = 0;
// ignore leading dots
while (start < _fname.length() && _fname[start] == '.')
start++;
string sub = _fname.substr(start);
size_t pos = sub.rfind('.');
if (pos != string::npos && pos < sub.length()-1)
return sub.substr(pos+1);
return "";
}
/** Changes the suffix of the filename. If FilePath represents the
* location of a directory (and not of a file) nothing happens.
* @param[in] s new suffix */
void FilePath::suffix (const string &s) {
if (!_fname.empty()) {
string current_suffix = suffix();
if (!current_suffix.empty())
_fname.erase(_fname.length()-current_suffix.length()-1);
_fname += "."+s;
}
}
/** Returns the filename without suffix.
* Example: FilePath("/a/b/c.def", true) == "c" */
string FilePath::basename () const {
if (!_fname.empty()) {
size_t len = suffix().length();
if (len > 0)
len++; // strip dot too
return _fname.substr(0, _fname.length()-len);
}
return "";
}
/** Returns the absolute path string of this FilePath.
* @param[in] with_filename if false, the filename is omitted
* @return the absolute path string */
string FilePath::absolute (bool with_filename) const {
string path;
FORALL (_dirs, ConstIterator, it) {
path += "/" + *it;
}
if (path.empty())
path = "/";
if (with_filename && !_fname.empty())
path += "/"+_fname;
#ifdef __WIN32__
if (_drive)
path.insert(0, string(1, _drive) + ":");
#endif
return single_slashes(path);
}
/** Returns a path string of this FilePath relative to reldir. If we wanted to
* navigate from /a/b/c/d to /a/b/e/f using the shell command "cd", we could do that
* with the relative path argument: "cd ../../e/f". This function returns such a relative
* path. Example: FilePath("/a/b/e/f").relative("/a/b/c/d") => "../../e/f".
* @param[in] reldir absolute path to a directory
* @param[in] with_filename if false, the filename is omitted
* @return the relative path string */
string FilePath::relative (string reldir, bool with_filename) const {
if (reldir.empty())
reldir = FileSystem::getcwd();
#ifdef __WIN32__
adapt_current_path(reldir, _drive);
#endif
if (reldir[0] != '/')
return absolute();
FilePath rel(reldir, false);
string path;
#ifdef __WIN32__
if (rel._drive && _drive && rel._drive != _drive)
path += string(1, _drive) + ":";
#endif
ConstIterator i = _dirs.begin();
ConstIterator j = rel._dirs.begin();
while (i != _dirs.end() && j != rel._dirs.end() && *i == *j)
++i, ++j;
for (; j != rel._dirs.end(); ++j)
path += "../";
for (; i != _dirs.end(); ++i)
path += *i + "/";
if (!path.empty())
path.erase(path.length()-1, 1); // remove trailing slash
if (with_filename && !_fname.empty()) {
if (!path.empty() && path != "/")
path += "/";
path += _fname;
}
if (path.empty())
path = ".";
return single_slashes(path);
}
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