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+/*************************************************************************
+** FilePath.cpp **
+** **
+** This file is part of dvisvgm -- the DVI to SVG converter **
+** Copyright (C) 2005-2014 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 <config.h>
+#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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