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A.16.1 The Package Directories.Hierarchical_File_Names

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The library package Directories.Hierarchical_File_Names is an optional package providing operations for file name construction and decomposition for targets with hierarchical file naming. 

Static Semantics

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If provided, the library package Directories.Hierarchical_File_Names has the following declaration:
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package Ada.Directories.Hierarchical_File_Names is
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   function Is_Simple_Name (Name : in String) return Boolean;
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   function Is_Root_Directory_Name (Name : in String) return Boolean;
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   function Is_Parent_Directory_Name (Name : in String) return Boolean;
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   function Is_Current_Directory_Name (Name : in String) return Boolean;
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   function Is_Full_Name (Name : in String) return Boolean;
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   function Is_Relative_Name (Name : in String) return Boolean;
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   function Simple_Name (Name : in String) return String
      renames Ada.Directories.Simple_Name;
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   function Containing_Directory (Name : in String) return String
      renames Ada.Directories.Containing_Directory;
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   function Initial_Directory (Name : in String) return String;
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   function Relative_Name (Name : in String) return String;
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   function Compose (Directory      : in String := "";
                     Relative_Name  : in String;
                     Extension      : in String := "") return String;
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end Ada.Directories.Hierarchical_File_Names;
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 In addition to the operations provided in package Directories.Hierarchical_File_Names, the operations in package Directories can be used with hierarchical file names. In particular, functions Full_Name, Base_Name, and Extension provide additional capabilities for hierarchical file names.
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function Is_Simple_Name (Name : in String) return Boolean;
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Returns True if Name is a simple name, and returns False otherwise.
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function Is_Root_Directory_Name (Name : in String) return Boolean;
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Returns True if Name is syntactically a root (a directory that cannot be decomposed further), and returns False otherwise.
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function Is_Parent_Directory_Name (Name : in String) return Boolean;
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Returns True if Name can be used to indicate symbolically the parent directory of any directory, and returns False otherwise.
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function Is_Current_Directory_Name (Name : in String) return Boolean;
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Returns True if Name can be used to indicate symbolically the directory itself for any directory, and returns False otherwise.
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function Is_Full_Name (Name : in String) return Boolean;
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Returns True if the leftmost directory part of Name is a root, and returns False otherwise.
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function Is_Relative_Name (Name : in String) return Boolean;
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Returns True if Name allows the identification of an external file (including directories and special files) but is not a full name, and returns False otherwise.
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function Initial_Directory (Name : in String) return String;
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Returns the leftmost directory part in Name. That is, it returns a root directory name (for a full name), or one of a parent directory name, a current directory name, or a simple name (for a relative name). The exception Name_Error is propagated if the string given as Name does not allow the identification of an external file (including directories and special files).
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function Relative_Name (Name : in String) return String;
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Returns the entire file name except the Initial_Directory portion. The exception Name_Error is propagated if the string given as Name does not allow the identification of an external file (including directories and special files), or if Name has a single part (this includes if any of Is_Simple_Name, Is_Root_Directory_Name, Is_Parent_Directory_Name, or Is_Current_Directory_Name are True).
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function Compose (Directory      : in String := "";
                  Relative_Name  : in String;
                  Extension      : in String := "") return String;
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Returns the name of the external file with the specified Directory, Relative_Name, and Extension. The exception Name_Error is propagated if the string given as Directory is not the null string and does not allow the identification of a directory, or if Is_Relative_Name (Relative_Name) is False, or if the string given as Extension is not the null string and is not a possible extension, or if Extension is not the null string and Simple_Name (Relative_Name) is not a base name.
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The result of Compose is a full name if Is_Full_Name (Directory) is True; result is a relative name otherwise.

Implementation Advice

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 Directories.Hierarchical_File_Names should be provided for systems with hierarchical file naming, and should not be provided on other systems. 
NOTES
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46  These operations operate on file names, not external files. The files identified by these operations do not need to exist. Name_Error is raised only as specified or if the file name is malformed and cannot possibly identify a file. The result of these operations depends only on their parameters.
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47  Containing_Directory raises Use_Error if Name does not have a containing directory, including when any of Is_Simple_Name, Is_Root_Directory_Name, Is_Parent_Directory_Name, or Is_Current_Directory_Name are True.

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