488 lines
26 KiB
Ada
488 lines
26 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- A D A . D I R E C T O R I E S --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 2004-2014, Free Software Foundation, Inc. --
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-- --
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-- This specification is derived for use with GNAT from AI-00248, which is --
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-- expected to be a part of a future expected revised Ada Reference Manual. --
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-- The copyright notice above, and the license provisions that follow apply --
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-- solely to the contents of the part following the private keyword. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- Ada 2005: Implementation of Ada.Directories (AI95-00248). Note that this
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-- unit is available without -gnat05. That seems reasonable, since you only
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-- get it if you explicitly ask for it.
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-- External files may be classified as directories, special files, or ordinary
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-- files. A directory is an external file that is a container for files on
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-- the target system. A special file is an external file that cannot be
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-- created or read by a predefined Ada Input-Output package. External files
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-- that are not special files or directories are called ordinary files.
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-- A file name is a string identifying an external file. Similarly, a
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-- directory name is a string identifying a directory. The interpretation of
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-- file names and directory names is implementation-defined.
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-- The full name of an external file is a full specification of the name of
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-- the file. If the external environment allows alternative specifications of
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-- the name (for example, abbreviations), the full name should not use such
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-- alternatives. A full name typically will include the names of all of
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-- directories that contain the item. The simple name of an external file is
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-- the name of the item, not including any containing directory names. Unless
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-- otherwise specified, a file name or directory name parameter to a
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-- predefined Ada input-output subprogram can be a full name, a simple name,
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-- or any other form of name supported by the implementation.
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-- The default directory is the directory that is used if a directory or
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-- file name is not a full name (that is, when the name does not fully
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-- identify all of the containing directories).
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-- A directory entry is a single item in a directory, identifying a single
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-- external file (including directories and special files).
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-- For each function that returns a string, the lower bound of the returned
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-- value is 1.
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with Ada.Calendar;
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with Ada.Finalization;
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with Ada.IO_Exceptions;
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with Ada.Strings.Unbounded;
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package Ada.Directories is
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-----------------------------------
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-- Directory and File Operations --
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-----------------------------------
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function Current_Directory return String;
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-- Returns the full directory name for the current default directory. The
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-- name returned must be suitable for a future call to Set_Directory.
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-- The exception Use_Error is propagated if a default directory is not
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-- supported by the external environment.
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procedure Set_Directory (Directory : String);
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-- Sets the current default directory. The exception Name_Error is
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-- propagated if the string given as Directory does not identify an
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-- existing directory. The exception Use_Error is propagated if the
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-- external environment does not support making Directory (in the absence
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-- of Name_Error) a default directory.
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procedure Create_Directory
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(New_Directory : String;
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Form : String := "");
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-- Creates a directory with name New_Directory. The Form parameter can be
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-- used to give system-dependent characteristics of the directory; the
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-- interpretation of the Form parameter is implementation-defined. A null
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-- string for Form specifies the use of the default options of the
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-- implementation of the new directory. The exception Name_Error is
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-- propagated if the string given as New_Directory does not allow the
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-- identification of a directory. The exception Use_Error is propagated if
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-- the external environment does not support the creation of a directory
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-- with the given name (in the absence of Name_Error) and form.
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--
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-- The Form parameter is ignored
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procedure Delete_Directory (Directory : String);
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-- Deletes an existing empty directory with name Directory. The exception
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-- Name_Error is propagated if the string given as Directory does not
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-- identify an existing directory. The exception Use_Error is propagated
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-- if the external environment does not support the deletion of the
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-- directory (or some portion of its contents) with the given name (in the
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-- absence of Name_Error).
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procedure Create_Path
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(New_Directory : String;
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Form : String := "");
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-- Creates zero or more directories with name New_Directory. Each
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-- non-existent directory named by New_Directory is created. For example,
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-- on a typical Unix system, Create_Path ("/usr/me/my"); would create
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-- directory "me" in directory "usr", then create directory "my"
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-- in directory "me". The Form can be used to give system-dependent
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-- characteristics of the directory; the interpretation of the Form
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-- parameter is implementation-defined. A null string for Form specifies
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-- the use of the default options of the implementation of the new
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-- directory. The exception Name_Error is propagated if the string given
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-- as New_Directory does not allow the identification of any directory. The
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-- exception Use_Error is propagated if the external environment does not
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-- support the creation of any directories with the given name (in the
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-- absence of Name_Error) and form.
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--
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-- The Form parameter is ignored
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procedure Delete_Tree (Directory : String);
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-- Deletes an existing directory with name Directory. The directory and
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-- all of its contents (possibly including other directories) are deleted.
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-- The exception Name_Error is propagated if the string given as Directory
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-- does not identify an existing directory. The exception Use_Error is
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-- propagated if the external environment does not support the deletion
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-- of the directory or some portion of its contents with the given name
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-- (in the absence of Name_Error). If Use_Error is propagated, it is
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-- unspecified if a portion of the contents of the directory are deleted.
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procedure Delete_File (Name : String);
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-- Deletes an existing ordinary or special file with Name. The exception
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-- Name_Error is propagated if the string given as Name does not identify
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-- an existing ordinary or special external file. The exception Use_Error
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-- is propagated if the external environment does not support the deletion
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-- of the file with the given name (in the absence of Name_Error).
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procedure Rename (Old_Name, New_Name : String);
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-- Renames an existing external file (including directories) with Old_Name
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-- to New_Name. The exception Name_Error is propagated if the string given
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-- as Old_Name does not identify an existing external file. The exception
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-- Use_Error is propagated if the external environment does not support the
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-- renaming of the file with the given name (in the absence of Name_Error).
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-- In particular, Use_Error is propagated if a file or directory already
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-- exists with New_Name.
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procedure Copy_File
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(Source_Name : String;
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Target_Name : String;
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Form : String := "");
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-- Copies the contents of the existing external file with Source_Name to
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-- Target_Name. The resulting external file is a duplicate of the source
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-- external file. The Form argument can be used to give system-dependent
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-- characteristics of the resulting external file; the interpretation of
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-- the Form parameter is implementation-defined. Exception Name_Error is
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-- propagated if the string given as Source_Name does not identify an
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-- existing external ordinary or special file or if the string given as
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-- Target_Name does not allow the identification of an external file. The
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-- exception Use_Error is propagated if the external environment does not
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-- support the creating of the file with the name given by Target_Name and
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-- form given by Form, or copying of the file with the name given by
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-- Source_Name (in the absence of Name_Error).
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--
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-- Interpretation of the Form parameter:
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--
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-- The Form parameter is case-insensitive
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--
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-- Two fields are recognized in the Form parameter:
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-- preserve=<value>
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-- mode=<value>
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--
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-- <value> starts immediately after the character '=' and ends with the
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-- character immediately preceding the next comma (',') or with the
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-- last character of the parameter.
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--
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-- The allowed values for preserve= are:
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--
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-- no_attributes: Do not try to preserve any file attributes. This
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-- is the default if no preserve= is found in Form.
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--
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-- all_attributes: Try to preserve all file attributes (timestamps,
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-- access rights).
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--
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-- timestamps: Preserve the timestamp of the copied file, but not
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-- the other file attributes.
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--
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-- The allowed values for mode= are:
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--
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-- copy: Only copy if the destination file does not already
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-- exist. If it already exists, Copy_File will fail.
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--
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-- overwrite: Copy the file in all cases. Overwrite an already
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-- existing destination file. This is the default if
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-- no mode= is found in Form.
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--
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-- append: Append the original file to the destination file.
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-- If the destination file does not exist, the
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-- destination file is a copy of the source file.
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-- When mode=append, the field preserve=, if it
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-- exists, is not taken into account.
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--
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-- If the Form parameter includes one or both of the fields and the value
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-- or values are incorrect, Copy_File fails with Use_Error.
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--
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-- Examples of correct Forms:
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-- Form => "preserve=no_attributes,mode=overwrite" (the default)
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-- Form => "mode=append"
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-- Form => "mode=copy,preserve=all_attributes"
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--
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-- Examples of incorrect Forms:
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-- Form => "preserve=junk"
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-- Form => "mode=internal,preserve=timestamps"
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----------------------------------------
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-- File and directory name operations --
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----------------------------------------
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function Full_Name (Name : String) return String;
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-- Returns the full name corresponding to the file name specified by Name.
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-- The exception Name_Error is propagated if the string given as Name does
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-- not allow the identification of an external file (including directories
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-- and special files).
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function Simple_Name (Name : String) return String;
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-- Returns the simple name portion of the file name specified by Name. The
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-- exception Name_Error is propagated if the string given as Name does not
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-- allow the identification of an external file (including directories and
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-- special files).
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function Containing_Directory (Name : String) return String;
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-- Returns the name of the containing directory of the external file
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-- (including directories) identified by Name. If more than one directory
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-- can contain Name, the directory name returned is implementation-defined.
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-- The exception Name_Error is propagated if the string given as Name does
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-- not allow the identification of an external file. The exception
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-- Use_Error is propagated if the external file does not have a containing
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-- directory.
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function Extension (Name : String) return String;
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-- Returns the extension name corresponding to Name. The extension name is
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-- a portion of a simple name (not including any separator characters),
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-- typically used to identify the file class. If the external environment
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-- does not have extension names, then the null string is returned.
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-- The exception Name_Error is propagated if the string given as Name does
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-- not allow the identification of an external file.
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function Base_Name (Name : String) return String;
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-- Returns the base name corresponding to Name. The base name is the
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-- remainder of a simple name after removing any extension and extension
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-- separators. The exception Name_Error is propagated if the string given
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-- as Name does not allow the identification of an external file
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-- (including directories and special files).
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function Compose
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(Containing_Directory : String := "";
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Name : String;
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Extension : String := "") return String;
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-- Returns the name of the external file with the specified
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-- Containing_Directory, Name, and Extension. If Extension is the null
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-- string, then Name is interpreted as a simple name; otherwise Name is
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-- interpreted as a base name. The exception Name_Error is propagated if
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-- the string given as Containing_Directory is not null and does not allow
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-- the identification of a directory, or if the string given as Extension
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-- is not null and is not a possible extension, or if the string given as
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-- Name is not a possible simple name (if Extension is null) or base name
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-- (if Extension is non-null).
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--------------------------------
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-- File and directory queries --
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--------------------------------
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type File_Kind is (Directory, Ordinary_File, Special_File);
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-- The type File_Kind represents the kind of file represented by an
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-- external file or directory.
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type File_Size is range 0 .. Long_Long_Integer'Last;
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-- The type File_Size represents the size of an external file
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function Exists (Name : String) return Boolean;
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-- Returns True if external file represented by Name exists, and False
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-- otherwise. The exception Name_Error is propagated if the string given as
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-- Name does not allow the identification of an external file (including
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-- directories and special files).
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function Kind (Name : String) return File_Kind;
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-- Returns the kind of external file represented by Name. The exception
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-- Name_Error is propagated if the string given as Name does not allow the
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-- identification of an existing external file.
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function Size (Name : String) return File_Size;
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-- Returns the size of the external file represented by Name. The size of
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-- an external file is the number of stream elements contained in the file.
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-- If the external file is discontiguous (not all elements exist), the
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-- result is implementation-defined. If the external file is not an
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-- ordinary file, the result is implementation-defined. The exception
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-- Name_Error is propagated if the string given as Name does not allow the
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-- identification of an existing external file. The exception
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-- Constraint_Error is propagated if the file size is not a value of type
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-- File_Size.
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function Modification_Time (Name : String) return Ada.Calendar.Time;
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-- Returns the time that the external file represented by Name was most
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-- recently modified. If the external file is not an ordinary file, the
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-- result is implementation-defined. The exception Name_Error is propagated
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-- if the string given as Name does not allow the identification of an
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-- existing external file. The exception Use_Error is propagated if the
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-- external environment does not support the reading the modification time
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-- of the file with the name given by Name (in the absence of Name_Error).
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-------------------------
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-- Directory Searching --
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-------------------------
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type Directory_Entry_Type is limited private;
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-- The type Directory_Entry_Type represents a single item in a directory.
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-- These items can only be created by the Get_Next_Entry procedure in this
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-- package. Information about the item can be obtained from the functions
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-- declared in this package. A default initialized object of this type is
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-- invalid; objects returned from Get_Next_Entry are valid.
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type Filter_Type is array (File_Kind) of Boolean;
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-- The type Filter_Type specifies which directory entries are provided from
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-- a search operation. If the Directory component is True, directory
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-- entries representing directories are provided. If the Ordinary_File
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-- component is True, directory entries representing ordinary files are
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-- provided. If the Special_File component is True, directory entries
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-- representing special files are provided.
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type Search_Type is limited private;
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-- The type Search_Type contains the state of a directory search. A
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-- default-initialized Search_Type object has no entries available
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-- (More_Entries returns False).
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procedure Start_Search
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(Search : in out Search_Type;
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Directory : String;
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Pattern : String;
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Filter : Filter_Type := (others => True));
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-- Starts a search in the directory entry in the directory named by
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-- Directory for entries matching Pattern. Pattern represents a file name
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-- matching pattern. If Pattern is null, all items in the directory are
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-- matched; otherwise, the interpretation of Pattern is implementation-
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-- defined. Only items which match Filter will be returned. After a
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-- successful call on Start_Search, the object Search may have entries
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-- available, but it may have no entries available if no files or
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-- directories match Pattern and Filter. The exception Name_Error is
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-- propagated if the string given by Directory does not identify an
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-- existing directory, or if Pattern does not allow the identification of
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-- any possible external file or directory. The exception Use_Error is
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-- propagated if the external environment does not support the searching
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-- of the directory with the given name (in the absence of Name_Error).
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procedure End_Search (Search : in out Search_Type);
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-- Ends the search represented by Search. After a successful call on
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-- End_Search, the object Search will have no entries available. Note
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-- that it is not necessary to call End_Search if the call to Start_Search
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-- was unsuccessful and raised an exception (but it is harmless to make
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-- the call in this case).
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function More_Entries (Search : Search_Type) return Boolean;
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-- Returns True if more entries are available to be returned by a call
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-- to Get_Next_Entry for the specified search object, and False otherwise.
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procedure Get_Next_Entry
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(Search : in out Search_Type;
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Directory_Entry : out Directory_Entry_Type);
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-- Returns the next Directory_Entry for the search described by Search that
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-- matches the pattern and filter. If no further matches are available,
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-- Status_Error is raised. It is implementation-defined as to whether the
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-- results returned by this routine are altered if the contents of the
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-- directory are altered while the Search object is valid (for example, by
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-- another program). The exception Use_Error is propagated if the external
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-- environment does not support continued searching of the directory
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-- represented by Search.
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procedure Search
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(Directory : String;
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Pattern : String;
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Filter : Filter_Type := (others => True);
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Process : not null access procedure
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(Directory_Entry : Directory_Entry_Type));
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-- Searches in the directory named by Directory for entries matching
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-- Pattern. The subprogram designated by Process is called with each
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-- matching entry in turn. Pattern represents a pattern for matching file
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-- names. If Pattern is null, all items in the directory are matched;
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-- otherwise, the interpretation of Pattern is implementation-defined.
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-- Only items that match Filter will be returned. The exception Name_Error
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-- is propagated if the string given by Directory does not identify
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-- an existing directory, or if Pattern does not allow the identification
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-- of any possible external file or directory. The exception Use_Error is
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-- propagated if the external environment does not support the searching
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-- of the directory with the given name (in the absence of Name_Error).
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-------------------------------------
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-- Operations on Directory Entries --
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-------------------------------------
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function Simple_Name (Directory_Entry : Directory_Entry_Type) return String;
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-- Returns the simple external name of the external file (including
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-- directories) represented by Directory_Entry. The format of the name
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-- returned is implementation-defined. The exception Status_Error is
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-- propagated if Directory_Entry is invalid.
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function Full_Name (Directory_Entry : Directory_Entry_Type) return String;
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-- Returns the full external name of the external file (including
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-- directories) represented by Directory_Entry. The format of the name
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-- returned is implementation-defined. The exception Status_Error is
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-- propagated if Directory_Entry is invalid.
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function Kind (Directory_Entry : Directory_Entry_Type) return File_Kind;
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-- Returns the kind of external file represented by Directory_Entry. The
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-- exception Status_Error is propagated if Directory_Entry is invalid.
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function Size (Directory_Entry : Directory_Entry_Type) return File_Size;
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-- Returns the size of the external file represented by Directory_Entry.
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-- The size of an external file is the number of stream elements contained
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-- in the file. If the external file is discontiguous (not all elements
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-- exist), the result is implementation-defined. If the external file
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-- represented by Directory_Entry is not an ordinary file, the result is
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-- implementation-defined. The exception Status_Error is propagated if
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-- Directory_Entry is invalid. The exception Constraint_Error is propagated
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-- if the file size is not a value of type File_Size.
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function Modification_Time
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(Directory_Entry : Directory_Entry_Type) return Ada.Calendar.Time;
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-- Returns the time that the external file represented by Directory_Entry
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-- was most recently modified. If the external file represented by
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-- Directory_Entry is not an ordinary file, the result is
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-- implementation-defined. The exception Status_Error is propagated if
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-- Directory_Entry is invalid. The exception Use_Error is propagated if
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-- the external environment does not support the reading the modification
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-- time of the file represented by Directory_Entry.
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----------------
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-- Exceptions --
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----------------
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Status_Error : exception renames Ada.IO_Exceptions.Status_Error;
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Name_Error : exception renames Ada.IO_Exceptions.Name_Error;
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Use_Error : exception renames Ada.IO_Exceptions.Use_Error;
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Device_Error : exception renames Ada.IO_Exceptions.Device_Error;
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private
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type Directory_Entry_Type is record
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Is_Valid : Boolean := False;
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Simple : Ada.Strings.Unbounded.Unbounded_String;
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Full : Ada.Strings.Unbounded.Unbounded_String;
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Kind : File_Kind := Ordinary_File;
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end record;
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-- The type Search_Data is defined in the body, so that the spec does not
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-- depend on packages of the GNAT hierarchy.
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type Search_Data;
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type Search_Ptr is access Search_Data;
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-- Search_Type need to be a controlled type, because it includes component
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-- of type Dir_Type (in GNAT.Directory_Operations) that need to be closed
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-- (if opened) during finalization. The component need to be an access
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-- value, because Search_Data is not fully defined in the spec.
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type Search_Type is new Ada.Finalization.Controlled with record
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Value : Search_Ptr;
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end record;
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procedure Finalize (Search : in out Search_Type);
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-- Close the directory, if opened, and deallocate Value
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|
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procedure End_Search (Search : in out Search_Type) renames Finalize;
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end Ada.Directories;
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