gtest/internal/gtest-filepath.h

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// Author: keith.ray@gmail.com (Keith Ray)
//
// Google Test filepath utilities
//
// This header file declares classes and functions used internally by
// Google Test.  They are subject to change without notice.
//
// This file is #included in <gtest/internal/gtest-internal.h>.
// Do not include this header file separately!

#ifndef GTEST_INCLUDE_GTEST_INTERNAL_GTEST_FILEPATH_H_
#define GTEST_INCLUDE_GTEST_INTERNAL_GTEST_FILEPATH_H_

#include "gtest/internal/gtest-string.h"

namespace testing
{
namespace internal
{
// FilePath - a class for file and directory pathname manipulation which
// handles platform-specific conventions (like the pathname separator).
// Used for helper functions for naming files in a directory for xml output.
// Except for Set methods, all methods are const or static, which provides an
// "immutable value object" -- useful for peace of mind.
// A FilePath with a value ending in a path separator ("like/this/") represents
// a directory, otherwise it is assumed to represent a file. In either case,
// it may or may not represent an actual file or directory in the file system.
// Names are NOT checked for syntax correctness -- no checking for illegal
// characters, malformed paths, etc.

class GTEST_API_ FilePath
{
public:
	FilePath() : pathname_("") {}
	FilePath(const FilePath& rhs) : pathname_(rhs.pathname_) {}

	explicit FilePath(const std::string& pathname) : pathname_(pathname)
	{
		Normalize();
	}

	FilePath& operator=(const FilePath& rhs)
	{
		Set(rhs);
		return *this;
	}

	void Set(const FilePath& rhs)
	{
		pathname_ = rhs.pathname_;
	}

	const std::string& string() const { return pathname_; }
	const char* c_str() const { return pathname_.c_str(); }

	// Returns the current working directory, or "" if unsuccessful.
	static FilePath GetCurrentDir();

	// Given directory = "dir", base_name = "test", number = 0,
	// extension = "xml", returns "dir/test.xml". If number is greater
	// than zero (e.g., 12), returns "dir/test_12.xml".
	// On Windows platform, uses \ as the separator rather than /.
	static FilePath MakeFileName(const FilePath& directory,
								 const FilePath& base_name,
								 int number,
								 const char* extension);

	// Given directory = "dir", relative_path = "test.xml",
	// returns "dir/test.xml".
	// On Windows, uses \ as the separator rather than /.
	static FilePath ConcatPaths(const FilePath& directory,
								const FilePath& relative_path);

	// Returns a pathname for a file that does not currently exist. The pathname
	// will be directory/base_name.extension or
	// directory/base_name_<number>.extension if directory/base_name.extension
	// already exists. The number will be incremented until a pathname is found
	// that does not already exist.
	// Examples: 'dir/foo_test.xml' or 'dir/foo_test_1.xml'.
	// There could be a race condition if two or more processes are calling this
	// function at the same time -- they could both pick the same filename.
	static FilePath GenerateUniqueFileName(const FilePath& directory,
										   const FilePath& base_name,
										   const char* extension);

	// Returns true iff the path is "".
	bool IsEmpty() const { return pathname_.empty(); }

	// If input name has a trailing separator character, removes it and returns
	// the name, otherwise return the name string unmodified.
	// On Windows platform, uses \ as the separator, other platforms use /.
	FilePath RemoveTrailingPathSeparator() const;

	// Returns a copy of the FilePath with the directory part removed.
	// Example: FilePath("path/to/file").RemoveDirectoryName() returns
	// FilePath("file"). If there is no directory part ("just_a_file"), it returns
	// the FilePath unmodified. If there is no file part ("just_a_dir/") it
	// returns an empty FilePath ("").
	// On Windows platform, '\' is the path separator, otherwise it is '/'.
	FilePath RemoveDirectoryName() const;

	// RemoveFileName returns the directory path with the filename removed.
	// Example: FilePath("path/to/file").RemoveFileName() returns "path/to/".
	// If the FilePath is "a_file" or "/a_file", RemoveFileName returns
	// FilePath("./") or, on Windows, FilePath(".\\"). If the filepath does
	// not have a file, like "just/a/dir/", it returns the FilePath unmodified.
	// On Windows platform, '\' is the path separator, otherwise it is '/'.
	FilePath RemoveFileName() const;

	// Returns a copy of the FilePath with the case-insensitive extension removed.
	// Example: FilePath("dir/file.exe").RemoveExtension("EXE") returns
	// FilePath("dir/file"). If a case-insensitive extension is not
	// found, returns a copy of the original FilePath.
	FilePath RemoveExtension(const char* extension) const;

	// Creates directories so that path exists. Returns true if successful or if
	// the directories already exist; returns false if unable to create
	// directories for any reason. Will also return false if the FilePath does
	// not represent a directory (that is, it doesn't end with a path separator).
	bool CreateDirectoriesRecursively() const;

	// Create the directory so that path exists. Returns true if successful or
	// if the directory already exists; returns false if unable to create the
	// directory for any reason, including if the parent directory does not
	// exist. Not named "CreateDirectory" because that's a macro on Windows.
	bool CreateFolder() const;

	// Returns true if FilePath describes something in the file-system,
	// either a file, directory, or whatever, and that something exists.
	bool FileOrDirectoryExists() const;

	// Returns true if pathname describes a directory in the file-system
	// that exists.
	bool DirectoryExists() const;

	// Returns true if FilePath ends with a path separator, which indicates that
	// it is intended to represent a directory. Returns false otherwise.
	// This does NOT check that a directory (or file) actually exists.
	bool IsDirectory() const;

	// Returns true if pathname describes a root directory. (Windows has one
	// root directory per disk drive.)
	bool IsRootDirectory() const;

	// Returns true if pathname describes an absolute path.
	bool IsAbsolutePath() const;

private:
	// Replaces multiple consecutive separators with a single separator.
	// For example, "bar///foo" becomes "bar/foo". Does not eliminate other
	// redundancies that might be in a pathname involving "." or "..".
	//
	// A pathname with multiple consecutive separators may occur either through
	// user error or as a result of some scripts or APIs that generate a pathname
	// with a trailing separator. On other platforms the same API or script
	// may NOT generate a pathname with a trailing "/". Then elsewhere that
	// pathname may have another "/" and pathname components added to it,
	// without checking for the separator already being there.
	// The script language and operating system may allow paths like "foo//bar"
	// but some of the functions in FilePath will not handle that correctly. In
	// particular, RemoveTrailingPathSeparator() only removes one separator, and
	// it is called in CreateDirectoriesRecursively() assuming that it will change
	// a pathname from directory syntax (trailing separator) to filename syntax.
	//
	// On Windows this method also replaces the alternate path separator '/' with
	// the primary path separator '\\', so that for example "bar\\/\\foo" becomes
	// "bar\\foo".

	void Normalize();

	// Returns a pointer to the last occurence of a valid path separator in
	// the FilePath. On Windows, for example, both '/' and '\' are valid path
	// separators. Returns NULL if no path separator was found.
	const char* FindLastPathSeparator() const;

	std::string pathname_;
};  // class FilePath

}  // namespace internal
}  // namespace testing

#endif  // GTEST_INCLUDE_GTEST_INTERNAL_GTEST_FILEPATH_H_