# file.t | documentation

    #charset "us-ascii"

    /*
     *   Copyright (c) 2001, 2006 Michael J. Roberts
     *
     *   This file is part of TADS 3.
     *
     *   This module defines classes and constants related to the File
     *   intrinsic class.  In particular, this module defines the Exception
     *   subclasses thrown by File methods.
     */

    #include <tads.h>
    #include <file.h>

    /* ------------------------------------------------------------------------ */
    /*
     *   File status information.  This is returned from file.getFileInfo().
     */
    class FileInfo: object
        construct(typ, siz, ctime, mtime, atime, target, attrs, ...)
        {
            fileType = typ;
            fileSize = siz;
            fileCreateTime = ctime;
            fileModifyTime = mtime;
            fileAccessTime = atime;
            fileLinkTarget = target;
            fileAttrs = attrs;

            /* for convenience, note if it's a directory and/or special link */
            isDir = (typ & FileTypeDir) != 0;
            specialLink = (typ & (FileTypeSelfLink | FileTypeParentLink));
        }

        /* is this file a directory? */
        isDir = nil

        /*
         *   Is this a special link directory?  This is FileTypeSelfLink for a
         *   directory link to itself; it's FileTypeParentLink for a directory
         *   link to the parent; it's zero for all other files.  On Windows and
         *   Unix, these flags will be set for the special "." and ".."
         *   directories, respectively.  These flags only apply to the
         *   *system-defined* special links; they aren't set for user-created
         *   links that happen to point to self or parent.  This is zero for
         *   all other files.
         */
        specialLink = 0

        /*
         *   Link target.  If the file is a symbolic link, this contains a
         *   string giving the target file's path.  This is the direct target
         *   of this link, which might itself be another link.
         */
        fileLinkTarget = nil

        /*
         *   type of the file, as a combination of FileTypeXxx bit flags (see
         *   filename.h)
         */
        fileType = 0

        /*
         *   file attributes, as a combination of FileAttrXxx bit flags (see
         *   filename.h)
         */
        fileAttrs = 0

        /* size of the file in bytes */
        fileSize = 0

        /*
         *   The file's time of creation, last modification, and last access,
         *   as Date objects.  On some systems, these timestamps might not all
         *   be available; an item that's not available is set to nil.
         */
        fileCreateTime = nil
        fileModifyTime = nil
        fileAccessTime = nil
    ;

    export FileInfo 'File.FileInfo';

    /* ------------------------------------------------------------------------ */
    /*
     *   File Exception classes.  All File exceptions derive from FileException,
     *   to allow for generic 'catch' clauses which catch any file-related
     *   error.
     */
    class FileException: Exception
        displayException() { "file error"; }
    ;

    /*
     *   File not found - this is thrown when attempting to open a file for
     *   reading and the file doesn't exist or can't be opened (because the user
     *   doesn't have privileges to read the file, or the file is already being
     *   used by another user, for example).
     */
    class FileNotFoundException: FileException
        displayException() { "file not found"; }
    ;

    /*
     *   File creation error - this is thrown when attempting to open a file for
     *   writing and the file can't be created; this can happen because the disk
     *   or the directory is full, due to privilege failures, or due to sharing
     *   violations, among other reasons.
     */
    class FileCreationException: FileException
        displayException() { "cannot create file"; }
    ;

    /*
     *   File cannot be opened - this is thrown when attempting to open a file
     *   for reading and writing but the file can't be opened.  This can happen
     *   for numerous reasons: sharing violations, privilege failures, lack of
     *   space on the disk or in the directory.
     */
    class FileOpenException: FileException
        displayException() { "cannot open file"; }
    ;

    /*
     *   File synchronization exception.  This is thrown when an operation
     *   (such as a read or write) is attempted during normal execution on a
     *   file object that was originally opened during pre-initialization.  A
     *   file object created during pre-initialization can't be used to access
     *   the file during ordinary execution, since the state of the external
     *   file might have changed since the pre-init session ended.  In such
     *   cases, a new file object must be created instead.
     */
    class FileSyncException: FileException
        displayException() { "file synchronization error"; }
    ;

    /*
     *   File closed - this is thrown when an operation is attempted on a file
     *   that has already been explicitly closed.
     */
    class FileClosedException: FileException
        displayException() { "operation attempted on closed file"; }
    ;

    /*
     *   File I/O exception - this is thrown when a read or write operation on a
     *   file fails.  This can indicate, for example, that the device containing
     *   the file is full, or that a physical media error occurred.
     */
    class FileIOException: FileException
        displayException() { "file I/O error"; }
    ;

    /*
     *   File mode error - this is thrown when an attempted operation is
     *   incompatible with the file's mode.  This is thrown under these
     *   conditions:
     *
     *   - writing to a file opened for read-only access
     *.  - reading from a file opened for write-only access
     *.  - calling readFile or writeFile on a raw-mode file
     *.  - calling readBytes or writeBytes on a non-raw-mode file
     */
    class FileModeException: FileException
        displayException() { "invalid file mode"; }
    ;

    /*
     *   File safety error - this is thrown when an attempted "open" operation
     *   is prohibited by the current file safety level set by the user.
     */
    class FileSafetyException: FileException
        displayException()
        {
            "access to file blocked by user-specified file safety level";
        }
    ;

    /* export the file exceptions for use by the intrinsic class */
    export FileNotFoundException 'File.FileNotFoundException';
    export FileCreationException 'File.FileCreationException';
    export FileOpenException 'File.FileOpenException';
    export FileIOException 'File.FileIOException';
    export FileSyncException 'File.FileSyncException';
    export FileClosedException 'File.FileClosedException';
    export FileModeException 'File.FileModeException';
    export FileSafetyException 'File.FileSafetyException';

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