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499 lines
14 KiB
C++
499 lines
14 KiB
C++
//
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// Path.h
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//
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// Library: Foundation
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// Package: Filesystem
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// Module: Path
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//
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// Definition of the Path class.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_Path_INCLUDED
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#define Foundation_Path_INCLUDED
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#include <vector>
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#include "Poco/Foundation.h"
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namespace Poco
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{
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class Foundation_API Path
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/// This class represents filesystem paths in a
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/// platform-independent manner.
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/// Unix, Windows and OpenVMS all use a different
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/// syntax for filesystem paths.
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/// This class can work with all three formats.
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/// A path is made up of an optional node name
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/// (only Windows and OpenVMS), an optional
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/// device name (also only Windows and OpenVMS),
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/// a list of directory names and an optional
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/// filename.
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{
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public:
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enum Style
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{
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PATH_UNIX, /// Unix-style path
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PATH_WINDOWS, /// Windows-style path
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PATH_VMS, /// VMS-style path
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PATH_NATIVE, /// The current platform's native style
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PATH_GUESS /// Guess the style by examining the path
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};
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typedef std::vector<std::string> StringVec;
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Path();
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/// Creates an empty relative path.
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Path(bool absolute);
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/// Creates an empty absolute or relative path.
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Path(const char * path);
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/// Creates a path from a string.
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Path(const char * path, Style style);
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/// Creates a path from a string.
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Path(const std::string & path);
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/// Creates a path from a string.
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Path(const std::string & path, Style style);
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/// Creates a path from a string.
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Path(const Path & path);
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/// Copy constructor
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Path(const Path & parent, const std::string & fileName);
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/// Creates a path from a parent path and a filename.
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/// The parent path is expected to reference a directory.
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Path(const Path & parent, const char * fileName);
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/// Creates a path from a parent path and a filename.
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/// The parent path is expected to reference a directory.
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Path(const Path & parent, const Path & relative);
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/// Creates a path from a parent path and a relative path.
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/// The parent path is expected to reference a directory.
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/// The relative path is appended to the parent path.
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~Path();
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/// Destroys the Path.
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Path & operator=(const Path & path);
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/// Assignment operator.
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Path & operator=(const std::string & path);
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/// Assigns a string containing a path in native format.
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Path & operator=(const char * path);
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/// Assigns a string containing a path in native format.
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void swap(Path & path);
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/// Swaps the path with another one.
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Path & assign(const std::string & path);
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/// Assigns a string containing a path in native format.
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Path & assign(const std::string & path, Style style);
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/// Assigns a string containing a path.
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Path & assign(const Path & path);
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/// Assigns the given path.
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Path & assign(const char * path);
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/// Assigns a string containing a path.
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std::string toString() const;
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/// Returns a string containing the path in native format.
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std::string toString(Style style) const;
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/// Returns a string containing the path in the given format.
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Path & parse(const std::string & path);
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/// Same as assign().
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Path & parse(const std::string & path, Style style);
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/// Assigns a string containing a path.
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bool tryParse(const std::string & path);
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/// Tries to interpret the given string as a path
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/// in native format.
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/// If the path is syntactically valid, assigns the
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/// path and returns true. Otherwise leaves the
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/// object unchanged and returns false.
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bool tryParse(const std::string & path, Style style);
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/// Tries to interpret the given string as a path,
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/// according to the given style.
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/// If the path is syntactically valid, assigns the
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/// path and returns true. Otherwise leaves the
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/// object unchanged and returns false.
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Path & parseDirectory(const std::string & path);
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/// The resulting path always refers to a directory and
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/// the filename part is empty.
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Path & parseDirectory(const std::string & path, Style style);
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/// The resulting path always refers to a directory and
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/// the filename part is empty.
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Path & makeDirectory();
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/// If the path contains a filename, the filename is appended
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/// to the directory list and cleared. Thus the resulting path
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/// always refers to a directory.
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Path & makeFile();
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/// If the path contains no filename, the last directory
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/// becomes the filename.
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Path & makeParent();
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/// Makes the path refer to its parent.
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Path & makeAbsolute();
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/// Makes the path absolute if it is relative.
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/// The current working directory is taken as base directory.
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Path & makeAbsolute(const Path & base);
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/// Makes the path absolute if it is relative.
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/// The given path is taken as base.
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Path & append(const Path & path);
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/// Appends the given path.
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Path & resolve(const Path & path);
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/// Resolves the given path against the current one.
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///
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/// If the given path is absolute, it replaces the current one.
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/// Otherwise, the relative path is appended to the current path.
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bool isAbsolute() const;
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/// Returns true iff the path is absolute.
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bool isRelative() const;
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/// Returns true iff the path is relative.
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bool isDirectory() const;
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/// Returns true iff the path references a directory
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/// (the filename part is empty).
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bool isFile() const;
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/// Returns true iff the path references a file
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/// (the filename part is not empty).
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Path & setNode(const std::string & node);
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/// Sets the node name.
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/// Setting a non-empty node automatically makes
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/// the path an absolute one.
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const std::string & getNode() const;
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/// Returns the node name.
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Path & setDevice(const std::string & device);
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/// Sets the device name.
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/// Setting a non-empty device automatically makes
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/// the path an absolute one.
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const std::string & getDevice() const;
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/// Returns the device name.
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int depth() const;
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/// Returns the number of directories in the directory list.
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const std::string & directory(int n) const;
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/// Returns the n'th directory in the directory list.
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/// If n == depth(), returns the filename.
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const std::string & operator[](int n) const;
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/// Returns the n'th directory in the directory list.
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/// If n == depth(), returns the filename.
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Path & pushDirectory(const std::string & dir);
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/// Adds a directory to the directory list.
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Path & popDirectory();
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/// Removes the last directory from the directory list.
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Path & popFrontDirectory();
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/// Removes the first directory from the directory list.
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Path & setFileName(const std::string & name);
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/// Sets the filename.
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const std::string & getFileName() const;
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/// Returns the filename.
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Path & setBaseName(const std::string & name);
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/// Sets the basename part of the filename and
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/// does not change the extension.
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std::string getBaseName() const;
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/// Returns the basename (the filename sans
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/// extension) of the path.
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Path & setExtension(const std::string & extension);
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/// Sets the filename extension.
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std::string getExtension() const;
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/// Returns the filename extension.
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const std::string & version() const;
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/// Returns the file version. VMS only.
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Path & clear();
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/// Clears all components.
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Path parent() const;
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/// Returns a path referring to the path's
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/// directory.
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Path absolute() const;
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/// Returns an absolute variant of the path,
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/// taking the current working directory as base.
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Path absolute(const Path & base) const;
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/// Returns an absolute variant of the path,
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/// taking the given path as base.
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static Path forDirectory(const std::string & path);
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/// Creates a path referring to a directory.
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static Path forDirectory(const std::string & path, Style style);
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/// Creates a path referring to a directory.
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static char separator();
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/// Returns the platform's path name separator, which separates
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/// the components (names) in a path.
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///
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/// On Unix systems, this is the slash '/'. On Windows systems,
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/// this is the backslash '\'. On OpenVMS systems, this is the
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/// period '.'.
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static char pathSeparator();
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/// Returns the platform's path separator, which separates
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/// single paths in a list of paths.
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///
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/// On Unix systems, this is the colon ':'. On Windows systems,
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/// this is the semicolon ';'. On OpenVMS systems, this is the
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/// comma ','.
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static std::string current();
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/// Returns the current working directory.
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static std::string home();
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/// Returns the user's home directory.
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static std::string configHome();
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/// Returns the user's config directory.
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///
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/// On Unix systems, this is the '~/.config/'. On Windows systems,
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/// this is '%APPDATA%'.
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static std::string dataHome();
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/// Returns the user's data directory.
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///
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/// On Unix systems, this is the '~/.local/share/'. On Windows systems,
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/// this is '%APPDATA%'.
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static std::string tempHome();
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/// Returns the user's temp directory.
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///
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/// On Unix systems, this is the '~/.local/temp/'.
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static std::string cacheHome();
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/// Returns the user's cache directory.
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///
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/// On Unix systems, this is the '~/.cache/'. On Windows systems,
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/// this is '%APPDATA%'.
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static std::string temp();
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/// Returns the temporary directory.
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static std::string config();
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/// Returns the systemwide config directory.
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///
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/// On Unix systems, this is the '/etc/'.
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static std::string null();
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/// Returns the name of the null device.
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static std::string expand(const std::string & path);
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/// Expands all environment variables contained in the path.
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///
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/// On Unix, a tilde as first character in the path is
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/// replaced with the path to user's home directory.
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static void listRoots(std::vector<std::string> & roots);
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/// Fills the vector with all filesystem roots available on the
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/// system. On Unix, there is exactly one root, "/".
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/// On Windows, the roots are the drive letters.
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/// On OpenVMS, the roots are the mounted disks.
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static bool find(StringVec::const_iterator it, StringVec::const_iterator end, const std::string & name, Path & path);
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/// Searches the file with the given name in the locations (paths) specified
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/// by it and end. A relative path may be given in name.
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///
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/// If the file is found in one of the locations, the complete
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/// path of the file is stored in the path given as argument and true is returned.
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/// Otherwise false is returned and the path argument remains unchanged.
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static bool find(const std::string & pathList, const std::string & name, Path & path);
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/// Searches the file with the given name in the locations (paths) specified
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/// in pathList. The paths in pathList must be delimited by the platform's
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/// path separator (see pathSeparator()). A relative path may be given in name.
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///
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/// If the file is found in one of the locations, the complete
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/// path of the file is stored in the path given as argument and true is returned.
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/// Otherwise false is returned and the path argument remains unchanged.
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static std::string transcode(const std::string & path);
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/// On Windows, if POCO has been compiled with Windows UTF-8 support
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/// (POCO_WIN32_UTF8), this function converts a string (usually containing a path)
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/// encoded in UTF-8 into a string encoded in the current Windows code page.
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///
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/// This function should be used for every string passed as a file name to
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/// a string stream or fopen().
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///
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/// On all other platforms, or if POCO has not been compiled with Windows UTF-8
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/// support, this function returns the string unchanged.
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protected:
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void parseUnix(const std::string & path);
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void parseWindows(const std::string & path);
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void parseVMS(const std::string & path);
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void parseGuess(const std::string & path);
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std::string buildUnix() const;
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std::string buildWindows() const;
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std::string buildVMS() const;
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private:
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std::string _node;
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std::string _device;
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std::string _name;
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std::string _version;
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StringVec _dirs;
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bool _absolute;
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};
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//
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// inlines
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//
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inline bool Path::isAbsolute() const
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{
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return _absolute;
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}
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inline bool Path::isRelative() const
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{
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return !_absolute;
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}
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inline bool Path::isDirectory() const
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{
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return _name.empty();
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}
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inline bool Path::isFile() const
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{
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return !_name.empty();
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}
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inline Path & Path::parse(const std::string & path)
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{
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return assign(path);
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}
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inline Path & Path::parse(const std::string & path, Style style)
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{
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return assign(path, style);
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}
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inline const std::string & Path::getNode() const
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{
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return _node;
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}
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inline const std::string & Path::getDevice() const
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{
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return _device;
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}
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inline const std::string & Path::getFileName() const
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{
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return _name;
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}
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inline int Path::depth() const
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{
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return int(_dirs.size());
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}
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inline const std::string & Path::version() const
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{
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return _version;
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}
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inline Path Path::forDirectory(const std::string & path)
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{
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Path p;
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return p.parseDirectory(path);
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}
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inline Path Path::forDirectory(const std::string & path, Style style)
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{
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Path p;
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return p.parseDirectory(path, style);
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}
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inline char Path::separator()
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{
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#if defined(POCO_OS_FAMILY_VMS)
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return '.';
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#else
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return '/';
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#endif
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}
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inline char Path::pathSeparator()
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{
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#if defined(POCO_OS_FAMILY_VMS)
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return ',';
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#else
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return ':';
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#endif
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}
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inline void swap(Path & p1, Path & p2)
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{
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p1.swap(p2);
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}
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} // namespace Poco
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#endif // Foundation_Path_INCLUDED
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