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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                              P R J . T R E E                             --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 2001-2011, Free Software Foundation, Inc.         --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 3,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --

-- for  more details.  You should have  received  a copy of the GNU General --

-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --

-- http://www.gnu.org/licenses for a complete copy of the license.          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

--  This package defines the structure of the Project File tree

with GNAT.Dynamic_HTables;

with GNAT.Dynamic_Tables;

with Table;

with Prj.Attr; use Prj.Attr;

with Prj.Env;

with Prj.Ext;

package Prj.Tree is

   -----------------

   -- Environment --

   -----------------

   --  The following record contains the context in which projects are parsed

   --  and processed (finding importing project, resolving external values,..).

   type Environment is record

      External : Prj.Ext.External_References;

      --  External references are stored in this hash table (and manipulated

      --  through subprograms in prj-ext.ads). External references are

      --  project-tree specific so that one can load the same tree twice but

      --  have two views of it, for instance.

      Project_Path : aliased Prj.Env.Project_Search_Path;

      --  The project path is tree specific, since we might want to load

      --  simultaneously multiple projects, each with its own search path, in

      --  particular when using different compilers with different default

      --  search directories.

      Flags : Prj.Processing_Flags;

      --  Configure errors and warnings

   end record;

   procedure Initialize

     (Self      : out Environment;

      Flags     : Processing_Flags);

   --  Initialize a new environment

   procedure Initialize_And_Copy

     (Self      : out Environment;

      Copy_From : Environment);

   --  Initialize a new environment, copying its values from Copy_From

   procedure Free (Self : in out Environment);

   --  Free the memory used by Self

   procedure Override_Flags

     (Self : in out Environment; Flags : Prj.Processing_Flags);

   --  Override the subprogram called in case there are parsing errors. This

   --  is needed in applications that do their own error handling, since the

   --  error handler is likely to be a local subprogram in this case (which

   --  can't be stored when the flags are created).

   -------------------

   -- Project nodes --

   -------------------

   type Project_Node_Tree_Data;

   type Project_Node_Tree_Ref is access all Project_Node_Tree_Data;

   --  Type to designate a project node tree, so that several project node

   --  trees can coexist in memory.

   Project_Nodes_Initial   : constant := 1_000;

   Project_Nodes_Increment : constant := 100;

   --  Allocation parameters for initializing and extending number

   --  of nodes in table Tree_Private_Part.Project_Nodes

   Project_Node_Low_Bound  : constant := 0;

   Project_Node_High_Bound : constant := 099_999_999;

   --  Range of values for project node id's (in practice infinite)

   type Project_Node_Id is range

     Project_Node_Low_Bound .. Project_Node_High_Bound;

   --  The index of table Tree_Private_Part.Project_Nodes

   Empty_Node : constant Project_Node_Id := Project_Node_Low_Bound;

   --  Designates no node in table Project_Nodes

   First_Node_Id : constant Project_Node_Id := Project_Node_Low_Bound + 1;

   subtype Variable_Node_Id is Project_Node_Id;

   --  Used to designate a node whose expected kind is one of

   --  N_Typed_Variable_Declaration, N_Variable_Declaration or

   --  N_Variable_Reference.

   subtype Package_Declaration_Id is Project_Node_Id;

   --  Used to designate a node whose expected kind is N_Project_Declaration

   type Project_Node_Kind is

     (N_Project,

      N_With_Clause,

      N_Project_Declaration,

      N_Declarative_Item,

      N_Package_Declaration,

      N_String_Type_Declaration,

      N_Literal_String,

      N_Attribute_Declaration,

      N_Typed_Variable_Declaration,

      N_Variable_Declaration,

      N_Expression,

      N_Term,

      N_Literal_String_List,

      N_Variable_Reference,

      N_External_Value,

      N_Attribute_Reference,

      N_Case_Construction,

      N_Case_Item,

      N_Comment_Zones,

      N_Comment);

   --  Each node in the tree is of a Project_Node_Kind. For the signification

   --  of the fields in each node of Project_Node_Kind, look at package

   --  Tree_Private_Part.

   function Present (Node : Project_Node_Id) return Boolean;

   pragma Inline (Present);

   --  Return True if Node /= Empty_Node

   function No (Node : Project_Node_Id) return Boolean;

   pragma Inline (No);

   --  Return True if Node = Empty_Node

   procedure Initialize (Tree : Project_Node_Tree_Ref);

   --  Initialize the Project File tree: empty the Project_Nodes table

   --  and reset the Projects_Htable.

   function Default_Project_Node

     (In_Tree       : Project_Node_Tree_Ref;

      Of_Kind       : Project_Node_Kind;

      And_Expr_Kind : Variable_Kind := Undefined) return Project_Node_Id;

   --  Returns a Project_Node_Record with the specified Kind and Expr_Kind. All

   --  the other components have default nil values.

   --  To create a node for a project itself, see Create_Project below instead

   function Hash (N : Project_Node_Id) return Header_Num;

   --  Used for hash tables where the key is a Project_Node_Id

   function Imported_Or_Extended_Project_Of

     (Project   : Project_Node_Id;

      In_Tree   : Project_Node_Tree_Ref;

      With_Name : Name_Id) return Project_Node_Id;

   --  Return the node of a project imported or extended by project Project and

   --  whose name is With_Name. Return Empty_Node if there is no such project.

   --------------

   -- Comments --

   --------------

   type Comment_State is private;

   --  A type to store the values of several global variables related to

   --  comments.

   procedure Save (S : out Comment_State);

   --  Save in variable S the comment state. Called before scanning a new

   --  project file.

   procedure Restore_And_Free (S : in out Comment_State);

   --  Restore the comment state to a previously saved value. Called after

   --  scanning a project file. Frees the memory occupied by S

   procedure Reset_State;

   --  Set the comment state to its initial value. Called before scanning a

   --  new project file.

   function There_Are_Unkept_Comments return Boolean;

   --  Indicates that some of the comments in a project file could not be

   --  stored in the parse tree.

   procedure Set_Previous_Line_Node (To : Project_Node_Id);

   --  Indicate the node on the previous line. If there are comments

   --  immediately following this line, then they should be associated with

   --  this node.

   procedure Set_Previous_End_Node (To : Project_Node_Id);

   --  Indicate that on the previous line the "end" belongs to node To.

   --  If there are comments immediately following this "end" line, they

   --  should be associated with this node.

   procedure Set_End_Of_Line (To : Project_Node_Id);

   --  Indicate the node on the current line. If there is an end of line

   --  comment, then it should be associated with this node.

   procedure Set_Next_End_Node (To : Project_Node_Id);

   --  Put node To on the top of the end node stack. When an END line is found

   --  with this node on the top of the end node stack, the comments, if any,

   --  immediately preceding this "end" line will be associated with this node.

   procedure Remove_Next_End_Node;

   --  Remove the top of the end node stack

   ------------------------

   -- Comment Processing --

   ------------------------

   type Comment_Data is record

      Value                     : Name_Id := No_Name;

      Follows_Empty_Line        : Boolean := False;

      Is_Followed_By_Empty_Line : Boolean := False;

   end record;

   --  Component type for Comments Table below

   package Comments is new Table.Table

     (Table_Component_Type => Comment_Data,

      Table_Index_Type     => Natural,

      Table_Low_Bound      => 1,

      Table_Initial        => 10,

      Table_Increment      => 100,

      Table_Name           => "Prj.Tree.Comments");

   --  A table to store the comments that may be stored is the tree

   procedure Scan (In_Tree : Project_Node_Tree_Ref);

   --  Scan the tokens and accumulate comments

   type Comment_Location is

     (Before, After, Before_End, After_End, End_Of_Line);

   --  Used in call to Add_Comments below

   procedure Add_Comments

     (To      : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref;

      Where   : Comment_Location);

   --  Add comments to this node

   ----------------------

   -- Access Functions --

   ----------------------

   --  The following query functions are part of the abstract interface

   --  of the Project File tree. They provide access to fields of a project.

   --  The access functions should be called only with valid arguments.

   --  For each function the condition of validity is specified. If an access

   --  function is called with invalid arguments, then exception

   --  Assertion_Error is raised if assertions are enabled, otherwise the

   --  behaviour is not defined and may result in a crash.

   function Name_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Name_Id;

   pragma Inline (Name_Of);

   --  Valid for all non empty nodes. May return No_Name for nodes that have

   --  no names.

   function Kind_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Kind;

   pragma Inline (Kind_Of);

   --  Valid for all non empty nodes

   function Location_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Source_Ptr;

   pragma Inline (Location_Of);

   --  Valid for all non empty nodes

   function First_Comment_After

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   --  Valid only for N_Comment_Zones nodes

   function First_Comment_After_End

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   --  Valid only for N_Comment_Zones nodes

   function First_Comment_Before

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   --  Valid only for N_Comment_Zones nodes

   function First_Comment_Before_End

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   --  Valid only for N_Comment_Zones nodes

   function Next_Comment

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   --  Valid only for N_Comment nodes

   function End_Of_Line_Comment

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Name_Id;

   --  Valid only for non empty nodes

   function Follows_Empty_Line

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Boolean;

   --  Valid only for N_Comment nodes

   function Is_Followed_By_Empty_Line

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Boolean;

   --  Valid only for N_Comment nodes

   function Parent_Project_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (Parent_Project_Of);

   --  Valid only for N_Project nodes

   function Project_File_Includes_Unkept_Comments

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Boolean;

   --  Valid only for N_Project nodes

   function Directory_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Path_Name_Type;

   pragma Inline (Directory_Of);

   --  Returns the directory that contains the project file. This always ends

   --  with a directory separator. Only valid for N_Project nodes.

   function Expression_Kind_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Variable_Kind;

   pragma Inline (Expression_Kind_Of);

   --  Only valid for N_Literal_String, N_Attribute_Declaration,

   --  N_Variable_Declaration, N_Typed_Variable_Declaration, N_Expression,

   --  N_Term, N_Variable_Reference, N_Attribute_Reference nodes or

   --  N_External_Value.

   function Is_Extending_All

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Boolean;

   pragma Inline (Is_Extending_All);

   --  Only valid for N_Project and N_With_Clause

   function Is_Not_Last_In_List

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Boolean;

   pragma Inline (Is_Not_Last_In_List);

   --  Only valid for N_With_Clause

   function First_Variable_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Variable_Node_Id;

   pragma Inline (First_Variable_Of);

   --  Only valid for N_Project or N_Package_Declaration nodes

   function First_Package_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Package_Declaration_Id;

   pragma Inline (First_Package_Of);

   --  Only valid for N_Project nodes

   function Package_Id_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Package_Node_Id;

   pragma Inline (Package_Id_Of);

   --  Only valid for N_Package_Declaration nodes

   function Path_Name_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Path_Name_Type;

   pragma Inline (Path_Name_Of);

   --  Only valid for N_Project and N_With_Clause nodes

   function String_Value_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Name_Id;

   pragma Inline (String_Value_Of);

   --  Only valid for N_With_Clause, N_Literal_String nodes or N_Comment.

   --  For a N_With_Clause created automatically for a virtual extending

   --  project, No_Name is returned.

   function Source_Index_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Int;

   pragma Inline (Source_Index_Of);

   --  Only valid for N_Literal_String and N_Attribute_Declaration nodes

   function First_With_Clause_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (First_With_Clause_Of);

   --  Only valid for N_Project nodes

   function Project_Declaration_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (Project_Declaration_Of);

   --  Only valid for N_Project nodes

   function Project_Qualifier_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Qualifier;

   pragma Inline (Project_Qualifier_Of);

   --  Only valid for N_Project nodes

   function Extending_Project_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (Extending_Project_Of);

   --  Only valid for N_Project_Declaration nodes

   function First_String_Type_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (First_String_Type_Of);

   --  Only valid for N_Project nodes

   function Extended_Project_Path_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Path_Name_Type;

   pragma Inline (Extended_Project_Path_Of);

   --  Only valid for N_With_Clause nodes

   function Project_Node_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (Project_Node_Of);

   --  Only valid for N_With_Clause, N_Variable_Reference and

   --  N_Attribute_Reference nodes.

   function Non_Limited_Project_Node_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (Non_Limited_Project_Node_Of);

   --  Only valid for N_With_Clause nodes. Returns Empty_Node for limited

   --  imported project files, otherwise returns the same result as

   --  Project_Node_Of.

   function Next_With_Clause_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (Next_With_Clause_Of);

   --  Only valid for N_With_Clause nodes

   function First_Declarative_Item_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (First_Declarative_Item_Of);

   --  Only valid for N_Project_Declaration, N_Case_Item and

   --  N_Package_Declaration.

   function Extended_Project_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (Extended_Project_Of);

   --  Only valid for N_Project_Declaration nodes

   function Current_Item_Node

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (Current_Item_Node);

   --  Only valid for N_Declarative_Item nodes

   function Next_Declarative_Item

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (Next_Declarative_Item);

   --  Only valid for N_Declarative_Item node

   function Project_Of_Renamed_Package_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (Project_Of_Renamed_Package_Of);

   --  Only valid for N_Package_Declaration nodes. May return Empty_Node.

   function Next_Package_In_Project

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (Next_Package_In_Project);

   --  Only valid for N_Package_Declaration nodes

   function First_Literal_String

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (First_Literal_String);

   --  Only valid for N_String_Type_Declaration nodes

   function Next_String_Type

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (Next_String_Type);

   --  Only valid for N_String_Type_Declaration nodes

   function Next_Literal_String

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (Next_Literal_String);

   --  Only valid for N_Literal_String nodes

   function Expression_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (Expression_Of);

   --  Only valid for N_Attribute_Declaration, N_Typed_Variable_Declaration

   --  or N_Variable_Declaration nodes

   function Associative_Project_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref)

      return  Project_Node_Id;

   pragma Inline (Associative_Project_Of);

   --  Only valid for N_Attribute_Declaration nodes

   function Associative_Package_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref)

      return  Project_Node_Id;

   pragma Inline (Associative_Package_Of);

   --  Only valid for N_Attribute_Declaration nodes

   function Value_Is_Valid

     (For_Typed_Variable : Project_Node_Id;

      In_Tree            : Project_Node_Tree_Ref;

      Value              : Name_Id) return Boolean;

   pragma Inline (Value_Is_Valid);

   --  Only valid for N_Typed_Variable_Declaration. Returns True if Value is

   --  in the list of allowed strings for For_Typed_Variable. False otherwise.

   function Associative_Array_Index_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Name_Id;

   pragma Inline (Associative_Array_Index_Of);

   --  Only valid for N_Attribute_Declaration and N_Attribute_Reference.

   --  Returns No_Name for non associative array attributes.

   function Next_Variable

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (Next_Variable);

   --  Only valid for N_Typed_Variable_Declaration or N_Variable_Declaration

   --  nodes.

   function First_Term

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (First_Term);

   --  Only valid for N_Expression nodes

   function Next_Expression_In_List

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (Next_Expression_In_List);

   --  Only valid for N_Expression nodes

   function Current_Term

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (Current_Term);

   --  Only valid for N_Term nodes

   function Next_Term

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (Next_Term);

   --  Only valid for N_Term nodes

   function First_Expression_In_List

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (First_Expression_In_List);

   --  Only valid for N_Literal_String_List nodes

   function Package_Node_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (Package_Node_Of);

   --  Only valid for N_Variable_Reference or N_Attribute_Reference nodes.

   --  May return Empty_Node.

   function String_Type_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (String_Type_Of);

   --  Only valid for N_Variable_Reference or N_Typed_Variable_Declaration

   --  nodes.

   function External_Reference_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (External_Reference_Of);

   --  Only valid for N_External_Value nodes

   function External_Default_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (External_Default_Of);

   --  Only valid for N_External_Value nodes

   function Case_Variable_Reference_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (Case_Variable_Reference_Of);

   --  Only valid for N_Case_Construction nodes

   function First_Case_Item_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (First_Case_Item_Of);

   --  Only valid for N_Case_Construction nodes

   function First_Choice_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (First_Choice_Of);

   --  Only valid for N_Case_Item nodes. Return the first choice in a

   --  N_Case_Item, or Empty_Node if this is when others.

   function Next_Case_Item

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   pragma Inline (Next_Case_Item);

   --  Only valid for N_Case_Item nodes

   function Case_Insensitive

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref) return Boolean;

   --  Only valid for N_Attribute_Declaration and N_Attribute_Reference nodes

   -----------------------

   -- Create procedures --

   -----------------------

   --  The following procedures are used to edit a project file tree. They are

   --  slightly higher-level than the Set_* procedures below

   function Create_Project

     (In_Tree        : Project_Node_Tree_Ref;

      Name           : Name_Id;

      Full_Path      : Path_Name_Type;

      Is_Config_File : Boolean := False) return Project_Node_Id;

   --  Create a new node for a project and register it in the tree so that it

   --  can be retrieved later on.

   function Create_Package

     (Tree    : Project_Node_Tree_Ref;

      Project : Project_Node_Id;

      Pkg     : String) return Project_Node_Id;

   --  Create a new package in Project. If the package already exists, it is

   --  returned. The name of the package *must* be lower-cases, or none of its

   --  attributes will be recognized.

   function Create_Attribute

     (Tree       : Project_Node_Tree_Ref;

      Prj_Or_Pkg : Project_Node_Id;

      Name       : Name_Id;

      Index_Name : Name_Id         := No_Name;

      Kind       : Variable_Kind   := List;

      At_Index   : Integer         := 0;

      Value      : Project_Node_Id := Empty_Node) return Project_Node_Id;

   --  Create a new attribute. The new declaration is added at the end of the

   --  declarative item list for Prj_Or_Pkg (a project or a package), but

   --  before any package declaration). No addition is done if Prj_Or_Pkg is

   --  Empty_Node. If Index_Name is not "", then if creates an attribute value

   --  for a specific index. At_Index is used for the " at <idx>" in the naming

   --  exceptions.

   --

   --  To set the value of the attribute, either provide a value for Value, or

   --  use Set_Expression_Of to set the value of the attribute (in which case

   --  Enclose_In_Expression might be useful). The former is recommended since

   --  it will more correctly handle cases where the index needs to be set on

   --  the expression rather than on the index of the attribute (i.e. 'for

   --  Specification ("unit") use "file" at 3', versus 'for Executable ("file"

   --  at 3) use "name"'). Value must be a N_String_Literal if an index will be

   --  added to it.

   function Create_Literal_String

     (Str  : Namet.Name_Id;

      Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   --  Create a literal string whose value is Str

   procedure Add_At_End

     (Tree                  : Project_Node_Tree_Ref;

      Parent                : Project_Node_Id;

      Expr                  : Project_Node_Id;

      Add_Before_First_Pkg  : Boolean := False;

      Add_Before_First_Case : Boolean := False);

   --  Add a new declarative item in the list in Parent. This new declarative

   --  item will contain Expr (unless Expr is already a declarative item, in

   --  which case it is added directly to the list). The new item is inserted

   --  at the end of the list, unless Add_Before_First_Pkg is True. In the

   --  latter case, it is added just before the first case construction is

   --  seen, or before the first package (this assumes that all packages are

   --  found at the end of the project, which isn't true in the general case

   --  unless you have normalized the project to match this description).

   function Enclose_In_Expression

     (Node : Project_Node_Id;

      Tree : Project_Node_Tree_Ref) return Project_Node_Id;

   --  Enclose the Node inside a N_Expression node, and return this expression.

   --  This does nothing if Node is already a N_Expression.

   --------------------

   -- Set Procedures --

   --------------------

   --  The following procedures are part of the abstract interface of the

   --  Project File tree.

   --  Foe each Set_* procedure the condition of validity is specified. If an

   --  access function is called with invalid arguments, then exception

   --  Assertion_Error is raised if assertions are enabled, otherwise the

   --  behaviour is not defined and may result in a crash.

   --  These are very low-level, and manipulate the tree itself directly. You

   --  should look at the Create_* procedure instead if you want to use higher

   --  level constructs

   procedure Set_Name_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref;

      To      : Name_Id);

   pragma Inline (Set_Name_Of);

   --  Valid for all non empty nodes.

   procedure Set_Kind_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref;

      To      : Project_Node_Kind);

   pragma Inline (Set_Kind_Of);

   --  Valid for all non empty nodes

   procedure Set_Location_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref;

      To      : Source_Ptr);

   pragma Inline (Set_Location_Of);

   --  Valid for all non empty nodes

   procedure Set_First_Comment_After

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref;

      To      : Project_Node_Id);

   pragma Inline (Set_First_Comment_After);

   --  Valid only for N_Comment_Zones nodes

   procedure Set_First_Comment_After_End

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref;

      To      : Project_Node_Id);

   pragma Inline (Set_First_Comment_After_End);

   --  Valid only for N_Comment_Zones nodes

   procedure Set_First_Comment_Before

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref;

      To      : Project_Node_Id);

   pragma Inline (Set_First_Comment_Before);

   --  Valid only for N_Comment_Zones nodes

   procedure Set_First_Comment_Before_End

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref;

      To      : Project_Node_Id);

   pragma Inline (Set_First_Comment_Before_End);

   --  Valid only for N_Comment_Zones nodes

   procedure Set_Next_Comment

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref;

      To      : Project_Node_Id);

   pragma Inline (Set_Next_Comment);

   --  Valid only for N_Comment nodes

   procedure Set_Parent_Project_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref;

      To      : Project_Node_Id);

   --  Valid only for N_Project nodes

   procedure Set_Project_File_Includes_Unkept_Comments

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref;

      To      : Boolean);

   --  Valid only for N_Project nodes

   procedure Set_Directory_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref;

      To      : Path_Name_Type);

   pragma Inline (Set_Directory_Of);

   --  Valid only for N_Project nodes

   procedure Set_Expression_Kind_Of

     (Node    : Project_Node_Id;

      In_Tree : Project_Node_Tree_Ref;

      To      : Variable_Kind);

   pragma Inline (Set_Expression_Kind_Of);

   --  Only valid for N_Literal_String, N_Attribute_Declaration,