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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- P R J . S T R T --
-- --
-- B o d y --
-- --
-- Copyright (C) 2001-2003 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 2, 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 COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
with Err_Vars; use Err_Vars;
with Namet; use Namet;
with Prj.Attr; use Prj.Attr;
with Prj.Err; use Prj.Err;
with Prj.Tree; use Prj.Tree;
with Scans; use Scans;
with Snames;
with Table;
with Types; use Types;
package body Prj.Strt is
type Choice_String is record
The_String : Name_Id;
Already_Used : Boolean := False;
end record;
-- The string of a case label, and an indication that it has already
-- been used (to avoid duplicate case labels).
Choices_Initial : constant := 10;
Choices_Increment : constant := 50;
Choice_Node_Low_Bound : constant := 0;
Choice_Node_High_Bound : constant := 099_999_999;
-- In practice, infinite
type Choice_Node_Id is
range Choice_Node_Low_Bound .. Choice_Node_High_Bound;
First_Choice_Node_Id : constant Choice_Node_Id :=
Choice_Node_Low_Bound;
package Choices is
new Table.Table (Table_Component_Type => Choice_String,
Table_Index_Type => Choice_Node_Id,
Table_Low_Bound => First_Choice_Node_Id,
Table_Initial => Choices_Initial,
Table_Increment => Choices_Increment,
Table_Name => "Prj.Strt.Choices");
-- Used to store the case labels and check that there is no duplicate.
package Choice_Lasts is
new Table.Table (Table_Component_Type => Choice_Node_Id,
Table_Index_Type => Nat,
Table_Low_Bound => 1,
Table_Initial => 10,
Table_Increment => 100,
Table_Name => "Prj.Strt.Choice_Lasts");
-- Used to store the indices of the choices in table Choices,
-- to distinguish nested case constructions.
Choice_First : Choice_Node_Id := 0;
-- Index in table Choices of the first case label of the current
-- case construction. Zero means no current case construction.
type Name_Location is record
Name : Name_Id := No_Name;
Location : Source_Ptr := No_Location;
end record;
-- Store the identifier and the location of a simple name
package Names is
new Table.Table (Table_Component_Type => Name_Location,
Table_Index_Type => Nat,
Table_Low_Bound => 1,
Table_Initial => 10,
Table_Increment => 100,
Table_Name => "Prj.Strt.Names");
-- Used to accumulate the single names of a name
procedure Add (This_String : Name_Id);
-- Add a string to the case label list, indicating that it has not
-- yet been used.
procedure Add_To_Names (NL : Name_Location);
-- Add one single names to table Names
procedure External_Reference (External_Value : out Project_Node_Id);
-- Parse an external reference. Current token is "external".
procedure Attribute_Reference
(Reference : out Project_Node_Id;
First_Attribute : Attribute_Node_Id;
Current_Project : Project_Node_Id;
Current_Package : Project_Node_Id);
-- Parse an attribute reference. Current token is an apostrophe.
procedure Terms
(Term : out Project_Node_Id;
Expr_Kind : in out Variable_Kind;
Current_Project : Project_Node_Id;
Current_Package : Project_Node_Id);
-- Recursive procedure to parse one term or several terms concatenated
-- using "&".
---------
-- Add --
---------
procedure Add (This_String : Name_Id) is
begin
Choices.Increment_Last;
Choices.Table (Choices.Last) :=
(The_String => This_String,
Already_Used => False);
end Add;
------------------
-- Add_To_Names --
------------------
procedure Add_To_Names (NL : Name_Location) is
begin
Names.Increment_Last;
Names.Table (Names.Last) := NL;
end Add_To_Names;
-------------------------
-- Attribute_Reference --
-------------------------
procedure Attribute_Reference
(Reference : out Project_Node_Id;
First_Attribute : Attribute_Node_Id;
Current_Project : Project_Node_Id;
Current_Package : Project_Node_Id)
is
Current_Attribute : Attribute_Node_Id := First_Attribute;
begin
-- Declare the node of the attribute reference
Reference := Default_Project_Node (Of_Kind => N_Attribute_Reference);
Set_Location_Of (Reference, To => Token_Ptr);
Scan; -- past apostrophe
-- Body may be an attribute name
if Token = Tok_Body then
Token := Tok_Identifier;
Token_Name := Snames.Name_Body;
end if;
Expect (Tok_Identifier, "identifier");
if Token = Tok_Identifier then
Set_Name_Of (Reference, To => Token_Name);
-- Check if the identifier is one of the attribute identifiers in the
-- context (package or project level attributes).
while Current_Attribute /= Empty_Attribute
and then
Attributes.Table (Current_Attribute).Name /= Token_Name
loop
Current_Attribute := Attributes.Table (Current_Attribute).Next;
end loop;
-- If the identifier is not allowed, report an error
if Current_Attribute = Empty_Attribute then
Error_Msg_Name_1 := Token_Name;
Error_Msg ("unknown attribute %", Token_Ptr);
Reference := Empty_Node;
-- Scan past the attribute name
Scan;
else
-- Give its characteristics to this attribute reference
Set_Project_Node_Of (Reference, To => Current_Project);
Set_Package_Node_Of (Reference, To => Current_Package);
Set_Expression_Kind_Of
(Reference, To => Attributes.Table (Current_Attribute).Kind_1);
Set_Case_Insensitive
(Reference, To => Attributes.Table (Current_Attribute).Kind_2 =
Case_Insensitive_Associative_Array);
-- Scan past the attribute name
Scan;
-- If the attribute is an associative array, get the index
if Attributes.Table (Current_Attribute).Kind_2 /= Single then
Expect (Tok_Left_Paren, "`(`");
if Token = Tok_Left_Paren then
Scan;
Expect (Tok_String_Literal, "literal string");
if Token = Tok_String_Literal then
Set_Associative_Array_Index_Of
(Reference, To => Token_Name);
Scan;
Expect (Tok_Right_Paren, "`)`");
if Token = Tok_Right_Paren then
Scan;
end if;
end if;
end if;
end if;
end if;
-- Change name of obsolete attributes
if Reference /= Empty_Node then
case Name_Of (Reference) is
when Snames.Name_Specification =>
Set_Name_Of (Reference, To => Snames.Name_Spec);
when Snames.Name_Specification_Suffix =>
Set_Name_Of (Reference, To => Snames.Name_Spec_Suffix);
when Snames.Name_Implementation =>
Set_Name_Of (Reference, To => Snames.Name_Body);
when Snames.Name_Implementation_Suffix =>
Set_Name_Of (Reference, To => Snames.Name_Body_Suffix);
when others =>
null;
end case;
end if;
end if;
end Attribute_Reference;
---------------------------
-- End_Case_Construction --
---------------------------
procedure End_Case_Construction is
begin
-- If this is the only case construction, empty the tables
if Choice_Lasts.Last = 1 then
Choice_Lasts.Set_Last (0);
Choices.Set_Last (First_Choice_Node_Id);
Choice_First := 0;
elsif Choice_Lasts.Last = 2 then
-- This is the second case onstruction, set the tables to the first
Choice_Lasts.Set_Last (1);
Choices.Set_Last (Choice_Lasts.Table (1));
Choice_First := 1;
else
-- This is the 3rd or more case construction, set the tables to the
-- previous one.
Choice_Lasts.Decrement_Last;
Choices.Set_Last (Choice_Lasts.Table (Choice_Lasts.Last));
Choice_First := Choice_Lasts.Table (Choice_Lasts.Last - 1) + 1;
end if;
end End_Case_Construction;
------------------------
-- External_Reference --
------------------------
procedure External_Reference (External_Value : out Project_Node_Id) is
Field_Id : Project_Node_Id := Empty_Node;
begin
External_Value :=
Default_Project_Node (Of_Kind => N_External_Value,
And_Expr_Kind => Single);
Set_Location_Of (External_Value, To => Token_Ptr);
-- The current token is External
-- Get the left parenthesis
Scan;
Expect (Tok_Left_Paren, "`(`");
-- Scan past the left parenthesis
if Token = Tok_Left_Paren then
Scan;
end if;
-- Get the name of the external reference
Expect (Tok_String_Literal, "literal string");
if Token = Tok_String_Literal then
Field_Id :=
Default_Project_Node (Of_Kind => N_Literal_String,
And_Expr_Kind => Single);
Set_String_Value_Of (Field_Id, To => Token_Name);
Set_External_Reference_Of (External_Value, To => Field_Id);
-- Scan past the first argument
Scan;
case Token is
when Tok_Right_Paren =>
-- Scan past the right parenthesis
Scan;
when Tok_Comma =>
-- Scan past the comma
Scan;
Expect (Tok_String_Literal, "literal string");
-- Get the default
if Token = Tok_String_Literal then
Field_Id :=
Default_Project_Node (Of_Kind => N_Literal_String,
And_Expr_Kind => Single);
Set_String_Value_Of (Field_Id, To => Token_Name);
Set_External_Default_Of (External_Value, To => Field_Id);
Scan;
Expect (Tok_Right_Paren, "`)`");
end if;
-- Scan past the right parenthesis
if Token = Tok_Right_Paren then
Scan;
end if;
when others =>
Error_Msg ("`,` or `)` expected", Token_Ptr);
end case;
end if;
end External_Reference;
-----------------------
-- Parse_Choice_List --
-----------------------
procedure Parse_Choice_List (First_Choice : out Project_Node_Id) is
Current_Choice : Project_Node_Id := Empty_Node;
Next_Choice : Project_Node_Id := Empty_Node;
Choice_String : Name_Id := No_Name;
Found : Boolean := False;
begin
-- Declare the node of the first choice
First_Choice :=
Default_Project_Node (Of_Kind => N_Literal_String,
And_Expr_Kind => Single);
-- Initially Current_Choice is the same as First_Choice
Current_Choice := First_Choice;
loop
Expect (Tok_String_Literal, "literal string");
exit when Token /= Tok_String_Literal;
Set_Location_Of (Current_Choice, To => Token_Ptr);
Choice_String := Token_Name;
-- Give the string value to the current choice
Set_String_Value_Of (Current_Choice, To => Choice_String);
-- Check if the label is part of the string type and if it has not
-- been already used.
Found := False;
for Choice in Choice_First .. Choices.Last loop
if Choices.Table (Choice).The_String = Choice_String then
-- This label is part of the string type
Found := True;
if Choices.Table (Choice).Already_Used then
-- But it has already appeared in a choice list for this
-- case construction; report an error.
Error_Msg_Name_1 := Choice_String;
Error_Msg ("duplicate case label {", Token_Ptr);
else
Choices.Table (Choice).Already_Used := True;
end if;
exit;
end if;
end loop;
-- If the label is not part of the string list, report an error
if not Found then
Error_Msg_Name_1 := Choice_String;
Error_Msg ("illegal case label {", Token_Ptr);
end if;
-- Scan past the label
Scan;
-- If there is no '|', we are done
if Token = Tok_Vertical_Bar then
-- Otherwise, declare the node of the next choice, link it to
-- Current_Choice and set Current_Choice to this new node.
Next_Choice :=
Default_Project_Node (Of_Kind => N_Literal_String,
And_Expr_Kind => Single);
Set_Next_Literal_String (Current_Choice, To => Next_Choice);
Current_Choice := Next_Choice;
Scan;
else
exit;
end if;
end loop;
end Parse_Choice_List;
----------------------
-- Parse_Expression --
----------------------
procedure Parse_Expression
(Expression : out Project_Node_Id;
Current_Project : Project_Node_Id;
Current_Package : Project_Node_Id)
is
First_Term : Project_Node_Id := Empty_Node;
Expression_Kind : Variable_Kind := Undefined;
begin
-- Declare the node of the expression
Expression := Default_Project_Node (Of_Kind => N_Expression);
Set_Location_Of (Expression, To => Token_Ptr);
-- Parse the term or terms of the expression
Terms (Term => First_Term,
Expr_Kind => Expression_Kind,
Current_Project => Current_Project,
Current_Package => Current_Package);
-- Set the first term and the expression kind
Set_First_Term (Expression, To => First_Term);
Set_Expression_Kind_Of (Expression, To => Expression_Kind);
end Parse_Expression;
----------------------------
-- Parse_String_Type_List --
----------------------------
procedure Parse_String_Type_List (First_String : out Project_Node_Id) is
Last_String : Project_Node_Id := Empty_Node;
Next_String : Project_Node_Id := Empty_Node;
String_Value : Name_Id := No_Name;
begin
-- Declare the node of the first string
First_String :=
Default_Project_Node (Of_Kind => N_Literal_String,
And_Expr_Kind => Single);
-- Initially, Last_String is the same as First_String
Last_String := First_String;
loop
Expect (Tok_String_Literal, "literal string");
exit when Token /= Tok_String_Literal;
String_Value := Token_Name;
-- Give its string value to Last_String
Set_String_Value_Of (Last_String, To => String_Value);
Set_Location_Of (Last_String, To => Token_Ptr);
-- Now, check if the string is already part of the string type
declare
Current : Project_Node_Id := First_String;
begin
while Current /= Last_String loop
if String_Value_Of (Current) = String_Value then
-- This is a repetition, report an error
Error_Msg_Name_1 := String_Value;
Error_Msg ("duplicate value { in type", Token_Ptr);
exit;
end if;
Current := Next_Literal_String (Current);
end loop;
end;
-- Scan past the literal string
Scan;
-- If there is no comma following the literal string, we are done
if Token /= Tok_Comma then
exit;
else
-- Declare the next string, link it to Last_String and set
-- Last_String to its node.
Next_String :=
Default_Project_Node (Of_Kind => N_Literal_String,
And_Expr_Kind => Single);
Set_Next_Literal_String (Last_String, To => Next_String);
Last_String := Next_String;
Scan;
end if;
end loop;
end Parse_String_Type_List;
------------------------------
-- Parse_Variable_Reference --
------------------------------
procedure Parse_Variable_Reference
(Variable : out Project_Node_Id;
Current_Project : Project_Node_Id;
Current_Package : Project_Node_Id)
is
Current_Variable : Project_Node_Id := Empty_Node;
The_Package : Project_Node_Id := Current_Package;
The_Project : Project_Node_Id := Current_Project;
Specified_Project : Project_Node_Id := Empty_Node;
Specified_Package : Project_Node_Id := Empty_Node;
Look_For_Variable : Boolean := True;
First_Attribute : Attribute_Node_Id := Empty_Attribute;
Variable_Name : Name_Id;
begin
Names.Init;
loop
Expect (Tok_Identifier, "identifier");
if Token /= Tok_Identifier then
Look_For_Variable := False;
exit;
end if;
Add_To_Names (NL => (Name => Token_Name, Location => Token_Ptr));
Scan;
exit when Token /= Tok_Dot;
Scan;
end loop;
if Look_For_Variable then
if Token = Tok_Apostrophe then
-- Attribute reference
case Names.Last is
when 0 =>
-- Cannot happen
null;
when 1 =>
-- This may be a project name or a package name.
-- Project name have precedence.
-- First, look if it can be a package name
for Index in Package_First .. Package_Attributes.Last loop
if Package_Attributes.Table (Index).Name =
Names.Table (1).Name
then
First_Attribute :=
Package_Attributes.Table (Index).First_Attribute;
exit;
end if;
end loop;
-- Now, look if it can be a project name
The_Project := Imported_Or_Extended_Project_Of
(Current_Project, Names.Table (1).Name);
if The_Project = Empty_Node then
-- If it is neither a project name nor a package name,
-- report an error
if First_Attribute = Empty_Attribute then
Error_Msg_Name_1 := Names.Table (1).Name;
Error_Msg ("unknown project %",
Names.Table (1).Location);
First_Attribute := Attribute_First;
else
-- If it is a package name, check if the package
-- has already been declared in the current project.
The_Package := First_Package_Of (Current_Project);
while The_Package /= Empty_Node
and then Name_Of (The_Package) /=
Names.Table (1).Name
loop
The_Package :=
Next_Package_In_Project (The_Package);
end loop;
-- If it has not been already declared, report an
-- error.
if The_Package = Empty_Node then
Error_Msg_Name_1 := Names.Table (1).Name;
Error_Msg ("package % not yet defined",
Names.Table (1).Location);
end if;
end if;
else
-- It is a project name
First_Attribute := Attribute_First;
The_Package := Empty_Node;
end if;
when others =>
-- We have either a project name made of several simple
-- names (long project), or a project name (short project)
-- followed by a package name. The long project name has
-- precedence.
declare
Short_Project : Name_Id;
Long_Project : Name_Id;
begin
-- Clear the Buffer
Buffer_Last := 0;
-- Get the name of the short project
for Index in 1 .. Names.Last - 1 loop
Add_To_Buffer
(Get_Name_String (Names.Table (Index).Name));
if Index /= Names.Last - 1 then
Add_To_Buffer (".");
end if;
end loop;
Name_Len := Buffer_Last;
Name_Buffer (1 .. Buffer_Last) :=
Buffer (1 .. Buffer_Last);
Short_Project := Name_Find;
-- Now, add the last simple name to get the name of the
-- long project.
Add_To_Buffer (".");
Add_To_Buffer
(Get_Name_String (Names.Table (Names.Last).Name));
Name_Len := Buffer_Last;
Name_Buffer (1 .. Buffer_Last) :=
Buffer (1 .. Buffer_Last);
Long_Project := Name_Find;
-- Check if the long project is imported or extended
The_Project := Imported_Or_Extended_Project_Of
(Current_Project, Long_Project);
-- If the long project exists, then this is the prefix
-- of the attribute.
if The_Project /= Empty_Node then
First_Attribute := Attribute_First;
The_Package := Empty_Node;
else
-- Otherwise, check if the short project is imported
-- or extended.
The_Project := Imported_Or_Extended_Project_Of
(Current_Project, Short_Project);
-- If the short project does not exist, we report an
-- error.
if The_Project = Empty_Node then
Error_Msg_Name_1 := Long_Project;
Error_Msg_Name_2 := Short_Project;
Error_Msg ("unknown projects % or %",
Names.Table (1).Location);
The_Package := Empty_Node;
First_Attribute := Attribute_First;
else
-- Now, we check if the package has been declared
-- in this project.
The_Package := First_Package_Of (The_Project);
while The_Package /= Empty_Node
and then Name_Of (The_Package) /=
Names.Table (Names.Last).Name
loop
The_Package :=
Next_Package_In_Project (The_Package);
end loop;
-- If it has not, then we report an error
if The_Package = Empty_Node then
Error_Msg_Name_1 :=
Names.Table (Names.Last).Name;
Error_Msg_Name_2 := Short_Project;
Error_Msg ("package % not declared in project %",
Names.Table (Names.Last).Location);
First_Attribute := Attribute_First;
else
-- Otherwise, we have the correct project and
-- package.
First_Attribute :=
Package_Attributes.Table
(Package_Id_Of (The_Package)).First_Attribute;
end if;
end if;
end if;
end;
end case;
Attribute_Reference
(Variable,
Current_Project => The_Project,
Current_Package => The_Package,
First_Attribute => First_Attribute);
return;
end if;
end if;
Variable :=
Default_Project_Node (Of_Kind => N_Variable_Reference);
if Look_For_Variable then
case Names.Last is
when 0 =>
-- Cannot happen
null;
when 1 =>
-- Simple variable name
Set_Name_Of (Variable, To => Names.Table (1).Name);
when 2 =>
-- Variable name with a simple name prefix that can be
-- a project name or a package name. Project names have
-- priority over package names.
Set_Name_Of (Variable, To => Names.Table (2).Name);
-- Check if it can be a package name
The_Package := First_Package_Of (Current_Project);
while The_Package /= Empty_Node
and then Name_Of (The_Package) /= Names.Table (1).Name
loop
The_Package := Next_Package_In_Project (The_Package);
end loop;
-- Now look for a possible project name
The_Project := Imported_Or_Extended_Project_Of
(Current_Project, Names.Table (1).Name);
if The_Project /= Empty_Node then
Specified_Project := The_Project;
elsif The_Package = Empty_Node then
Error_Msg_Name_1 := Names.Table (1).Name;
Error_Msg ("unknown package or project %",
Names.Table (1).Location);
Look_For_Variable := False;
else
Specified_Package := The_Package;
end if;
when others =>
-- Variable name with a prefix that is either a project name
-- made of several simple names, or a project name followed
-- by a package name.
Set_Name_Of (Variable, To => Names.Table (Names.Last).Name);
declare
Short_Project : Name_Id;
Long_Project : Name_Id;
begin
-- First, we get the two possible project names
-- Clear the buffer
Buffer_Last := 0;
-- Add all the simple names, except the last two
for Index in 1 .. Names.Last - 2 loop
Add_To_Buffer
(Get_Name_String (Names.Table (Index).Name));
if Index /= Names.Last - 2 then
Add_To_Buffer (".");
end if;
end loop;
Name_Len := Buffer_Last;
Name_Buffer (1 .. Name_Len) := Buffer (1 .. Buffer_Last);
Short_Project := Name_Find;
-- Add the simple name before the name of the variable
Add_To_Buffer (".");
Add_To_Buffer
(Get_Name_String (Names.Table (Names.Last - 1).Name));
Name_Len := Buffer_Last;
Name_Buffer (1 .. Name_Len) := Buffer (1 .. Buffer_Last);
Long_Project := Name_Find;
-- Check if the prefix is the name of an imported or
-- extended project.
The_Project := Imported_Or_Extended_Project_Of
(Current_Project, Long_Project);
if The_Project /= Empty_Node then
Specified_Project := The_Project;
else
-- Now check if the prefix may be a project name followed
-- by a package name.
-- First check for a possible project name
The_Project := Imported_Or_Extended_Project_Of
(Current_Project, Short_Project);
if The_Project = Empty_Node then
-- Unknown prefix, report an error
Error_Msg_Name_1 := Long_Project;
Error_Msg_Name_2 := Short_Project;
Error_Msg ("unknown projects % or %",
Names.Table (1).Location);
Look_For_Variable := False;
else
Specified_Project := The_Project;
-- Now look for the package in this project
The_Package := First_Package_Of (The_Project);
while The_Package /= Empty_Node
and then Name_Of (The_Package) /=
Names.Table (Names.Last - 1).Name
loop
The_Package :=
Next_Package_In_Project (The_Package);
end loop;
if The_Package = Empty_Node then
-- The package does not vexist, report an error
Error_Msg_Name_1 := Names.Table (2).Name;
Error_Msg ("unknown package %",
Names.Table (Names.Last - 1).Location);
Look_For_Variable := False;
else
Specified_Package := The_Package;
end if;
end if;
end if;
end;
end case;
end if;
if Look_For_Variable then
Variable_Name := Name_Of (Variable);
Set_Project_Node_Of (Variable, To => Specified_Project);
Set_Package_Node_Of (Variable, To => Specified_Package);
if Specified_Project /= Empty_Node then
The_Project := Specified_Project;
else
The_Project := Current_Project;
end if;
Current_Variable := Empty_Node;
-- Look for this variable
-- If a package was specified, check if the variable has been
-- declared in this package.
if Specified_Package /= Empty_Node then
Current_Variable := First_Variable_Of (Specified_Package);
while Current_Variable /= Empty_Node
and then
Name_Of (Current_Variable) /= Variable_Name
loop
Current_Variable := Next_Variable (Current_Variable);
end loop;
else
-- Otherwise, if no project has been specified and we are in
-- a package, first check if the variable has been declared in
-- the package.
if Specified_Project = Empty_Node
and then Current_Package /= Empty_Node
then
Current_Variable := First_Variable_Of (Current_Package);
while Current_Variable /= Empty_Node
and then Name_Of (Current_Variable) /= Variable_Name
loop
Current_Variable := Next_Variable (Current_Variable);
end loop;
end if;
-- If we have not found the variable in the package, check if the
-- variable has been declared in the project.
if Current_Variable = Empty_Node then
Current_Variable := First_Variable_Of (The_Project);
while Current_Variable /= Empty_Node
and then Name_Of (Current_Variable) /= Variable_Name
loop
Current_Variable := Next_Variable (Current_Variable);
end loop;
end if;
end if;
-- If the variable was not found, report an error
if Current_Variable = Empty_Node then
Error_Msg_Name_1 := Variable_Name;
Error_Msg
("unknown variable %", Names.Table (Names.Last).Location);
end if;
end if;
if Current_Variable /= Empty_Node then
Set_Expression_Kind_Of
(Variable, To => Expression_Kind_Of (Current_Variable));
if Kind_Of (Current_Variable) = N_Typed_Variable_Declaration then
Set_String_Type_Of
(Variable, To => String_Type_Of (Current_Variable));
end if;
end if;
-- If the variable is followed by a left parenthesis, report an error
-- but attempt to scan the index.
if Token = Tok_Left_Paren then
Error_Msg ("\variables cannot be associative arrays", Token_Ptr);
Scan;
Expect (Tok_String_Literal, "literal string");
if Token = Tok_String_Literal then
Scan;
Expect (Tok_Right_Paren, "`)`");
if Token = Tok_Right_Paren then
Scan;
end if;
end if;
end if;
end Parse_Variable_Reference;
---------------------------------
-- Start_New_Case_Construction --
---------------------------------
procedure Start_New_Case_Construction (String_Type : Project_Node_Id) is
Current_String : Project_Node_Id;
begin
-- Set Choice_First, depending on whether is the first case
-- construction or not.
if Choice_First = 0 then
Choice_First := 1;
Choices.Set_Last (First_Choice_Node_Id);
else
Choice_First := Choices.Last + 1;
end if;
-- Add to table Choices the literal of the string type
if String_Type /= Empty_Node then
Current_String := First_Literal_String (String_Type);
while Current_String /= Empty_Node loop
Add (This_String => String_Value_Of (Current_String));
Current_String := Next_Literal_String (Current_String);
end loop;
end if;
-- Set the value of the last choice in table Choice_Lasts
Choice_Lasts.Increment_Last;
Choice_Lasts.Table (Choice_Lasts.Last) := Choices.Last;
end Start_New_Case_Construction;
-----------
-- Terms --
-----------
procedure Terms
(Term : out Project_Node_Id;
Expr_Kind : in out Variable_Kind;
Current_Project : Project_Node_Id;
Current_Package : Project_Node_Id)
is
Next_Term : Project_Node_Id := Empty_Node;
Term_Id : Project_Node_Id := Empty_Node;
Current_Expression : Project_Node_Id := Empty_Node;
Next_Expression : Project_Node_Id := Empty_Node;
Current_Location : Source_Ptr := No_Location;
Reference : Project_Node_Id := Empty_Node;
begin
-- Declare a new node for the term
Term := Default_Project_Node (Of_Kind => N_Term);
Set_Location_Of (Term, To => Token_Ptr);
case Token is
when Tok_Left_Paren =>
-- If we have a left parenthesis and we don't know the expression
-- kind, then this is a string list.
case Expr_Kind is
when Undefined =>
Expr_Kind := List;
when List =>
null;
when Single =>
-- If we already know that this is a single string, report
-- an error, but set the expression kind to string list to
-- avoid several errors.
Expr_Kind := List;
Error_Msg
("literal string list cannot appear in a string",
Token_Ptr);
end case;
-- Declare a new node for this literal string list
Term_Id := Default_Project_Node
(Of_Kind => N_Literal_String_List,
And_Expr_Kind => List);
Set_Current_Term (Term, To => Term_Id);
Set_Location_Of (Term, To => Token_Ptr);
-- Scan past the left parenthesis
Scan;
-- If the left parenthesis is immediately followed by a right
-- parenthesis, the literal string list is empty.
if Token = Tok_Right_Paren then
Scan;
else
-- Otherwise, we parse the expression(s) in the literal string
-- list.
loop
Current_Location := Token_Ptr;
Parse_Expression (Expression => Next_Expression,
Current_Project => Current_Project,
Current_Package => Current_Package);
-- The expression kind is String list, report an error
if Expression_Kind_Of (Next_Expression) = List then
Error_Msg ("single expression expected",
Current_Location);
end if;
-- If Current_Expression is empty, it means that the
-- expression is the first in the string list.
if Current_Expression = Empty_Node then
Set_First_Expression_In_List
(Term_Id, To => Next_Expression);
else
Set_Next_Expression_In_List
(Current_Expression, To => Next_Expression);
end if;
Current_Expression := Next_Expression;
-- If there is a comma, continue with the next expression
exit when Token /= Tok_Comma;
Scan; -- past the comma
end loop;
-- We expect a closing right parenthesis
Expect (Tok_Right_Paren, "`)`");
if Token = Tok_Right_Paren then
Scan;
end if;
end if;
when Tok_String_Literal =>
-- If we don't know the expression kind (first term), then it is
-- a simple string.
if Expr_Kind = Undefined then
Expr_Kind := Single;
end if;
-- Declare a new node for the string literal
Term_Id := Default_Project_Node (Of_Kind => N_Literal_String);
Set_Current_Term (Term, To => Term_Id);
Set_String_Value_Of (Term_Id, To => Token_Name);
-- Scan past the string literal
Scan;
when Tok_Identifier =>
Current_Location := Token_Ptr;
-- Get the variable or attribute reference
Parse_Variable_Reference
(Variable => Reference,
Current_Project => Current_Project,
Current_Package => Current_Package);
Set_Current_Term (Term, To => Reference);
if Reference /= Empty_Node then
-- If we don't know the expression kind (first term), then it
-- has the kind of the variable or attribute reference.
if Expr_Kind = Undefined then
Expr_Kind := Expression_Kind_Of (Reference);
elsif Expr_Kind = Single
and then Expression_Kind_Of (Reference) = List
then
-- If the expression is a single list, and the reference is
-- a string list, report an error, and set the expression
-- kind to string list to avoid multiple errors.
Expr_Kind := List;
Error_Msg
("list variable cannot appear in single string expression",
Current_Location);
end if;
end if;
when Tok_Project =>
-- project can appear in an expression as the prefix of an
-- attribute reference of the current project.
Current_Location := Token_Ptr;
Scan;
Expect (Tok_Apostrophe, "`'`");
if Token = Tok_Apostrophe then
Attribute_Reference
(Reference => Reference,
First_Attribute => Prj.Attr.Attribute_First,
Current_Project => Current_Project,
Current_Package => Empty_Node);
Set_Current_Term (Term, To => Reference);
end if;
-- Same checks as above for the expression kind
if Reference /= Empty_Node then
if Expr_Kind = Undefined then
Expr_Kind := Expression_Kind_Of (Reference);
elsif Expr_Kind = Single
and then Expression_Kind_Of (Reference) = List
then
Error_Msg
("lists cannot appear in single string expression",
Current_Location);
end if;
end if;
when Tok_External =>
-- An external reference is always a single string
if Expr_Kind = Undefined then
Expr_Kind := Single;
end if;
External_Reference (External_Value => Reference);
Set_Current_Term (Term, To => Reference);
when others =>
Error_Msg ("cannot be part of an expression", Token_Ptr);
Term := Empty_Node;
return;
end case;
-- If there is an '&', call Terms recursively
if Token = Tok_Ampersand then
-- Scan past the '&'
Scan;
Terms (Term => Next_Term,
Expr_Kind => Expr_Kind,
Current_Project => Current_Project,
Current_Package => Current_Package);
-- And link the next term to this term
Set_Next_Term (Term, To => Next_Term);
end if;
end Terms;
end Prj.Strt;