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-------------------------------------------------------------------------------
-- (C) Altran Praxis Limited
-------------------------------------------------------------------------------
--
-- The SPARK toolset is free software; you can redistribute it and/or modify it
-- under terms of the GNU General Public License as published by the Free
-- Software Foundation; either version 3, or (at your option) any later
-- version. The SPARK toolset is distributed in the hope that it will be
-- useful, but WITHOUT 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 the SPARK toolset; see file
-- COPYING3. If not, go to http://www.gnu.org/licenses for a complete copy of
-- the license.
--
--=============================================================================
with LexTokenManager;
with SparkLex;
with SP_Symbols;
with SparkMakeErrors;
use type SP_Symbols.SP_Terminal;
package body TokenManager is
procedure Next (It : in out Iterator) is
Unused : Boolean;
Token_Kind : SP_Symbols.SP_Terminal;
Lex_Value : LexTokenManager.Lex_Value;
procedure Get_Identifier (It : in out Iterator)
--# global in CommandLineData.Content;
--# in Dictionary.Dict;
--# in out ErrorHandler.Error_Context;
--# in out LexTokenManager.State;
--# in out SparkLex.Curr_Line;
--# in out SPARK_IO.File_Sys;
--# derives ErrorHandler.Error_Context,
--# It,
--# LexTokenManager.State,
--# SparkLex.Curr_Line,
--# SPARK_IO.File_Sys from CommandLineData.Content,
--# Dictionary.Dict,
--# ErrorHandler.Error_Context,
--# It,
--# LexTokenManager.State,
--# SparkLex.Curr_Line,
--# SPARK_IO.File_Sys;
--# pre SparkLex.Curr_Line_Invariant (SparkLex.Curr_Line);
--# post SparkLex.Curr_Line_Invariant (SparkLex.Curr_Line);
is
Unused : Boolean;
Token_Kind : SP_Symbols.SP_Terminal;
Lex_Value : LexTokenManager.Lex_Value;
begin
while It /= Null_Iterator loop
--# assert SparkLex.Curr_Line_Invariant (SparkLex.Curr_Line);
-- is there more dotted notation?
--# accept Flow, 10, Unused, "Ineffective assignment OK";
SparkLex.Examiner_Lex (Prog_Text => It.File,
Token => Token_Kind,
Lex_Val => Lex_Value,
Punct_Token => Unused);
--# end accept;
-- No, this is the end of the identifier and we have read a token too far.
if Token_Kind /= SP_Symbols.point then
It.Next_Token :=
Token'(Kind => Token_Kind,
Value => LexTokenManager.Lex_String_To_String (Lex_Str => Lex_Value.Token_Str));
exit;
end if;
-- Read the next part of the dotted identifier
--# accept Flow, 10, Unused, "Ineffective assignment OK";
SparkLex.Examiner_Lex (Prog_Text => It.File,
Token => Token_Kind,
Lex_Val => Lex_Value,
Punct_Token => Unused);
--# end accept;
if Token_Kind /= SP_Symbols.identifier then
-- Invlaid syntax return a null iterator
It := Null_Iterator;
else
E_Strings.Append_String (E_Str => It.Current_Token.Value,
Str => ".");
E_Strings.Append_Examiner_String
(E_Str1 => It.Current_Token.Value,
E_Str2 => LexTokenManager.Lex_String_To_String (Lex_Str => Lex_Value.Token_Str));
end if;
end loop;
--# accept Flow, 33, Unused, "Unused not references OK";
end Get_Identifier;
begin
if It = Null_Iterator then
SparkMakeErrors.Fatal ("calling TokenManager.Next with a null iterator.");
elsif It.Is_Look_Ahead then
It.Is_Look_Ahead := False;
elsif It.Next_Token /= Null_Token then
It.Current_Token := It.Next_Token;
It.Next_Token := Null_Token;
else
--# accept Flow, 10, Unused, "Ineffective assignment OK";
SparkLex.Examiner_Lex (Prog_Text => It.File,
Token => Token_Kind,
Lex_Val => Lex_Value,
Punct_Token => Unused);
--# end accept;
if Token_Kind = SP_Symbols.SPEND then
It := Null_Iterator;
else
It.Current_Token :=
Token'(Kind => Token_Kind,
Value => LexTokenManager.Lex_String_To_String (Lex_Str => Lex_Value.Token_Str));
if Token_Kind = SP_Symbols.identifier then
Get_Identifier (It => It);
end if;
end if;
end if;
--# accept Flow, 33, Unused, "Unused not references OK";
end Next;
-----------------------------------------------------------------------------
procedure Look_Ahead (It : in out Iterator) is
begin
if It = Null_Iterator then
SparkMakeErrors.Fatal ("calling TokenManager.Look_Ahead with a null iterator.");
elsif not It.Is_Look_Ahead then
Next (It => It);
It.Is_Look_Ahead := True;
end if;
end Look_Ahead;
-----------------------------------------------------------------------------
procedure Get_First_Token (File_Id : in SPARK_IO.File_Type;
It : out Iterator) is
New_It : Iterator;
begin
SparkLex.Clear_Line_Context;
New_It := Iterator'(File => File_Id,
Current_Token => Null_Token,
Next_Token => Null_Token,
Is_Look_Ahead => False);
Next (It => New_It);
It := New_It;
end Get_First_Token;
-----------------------------------------------------------------------------
function Is_Null (It : Iterator) return Boolean is
begin
return It = Null_Iterator;
end Is_Null;
-----------------------------------------------------------------------------
function Current (It : Iterator) return Token is
Result : Token;
begin
if It = Null_Iterator then
Result := Null_Token;
else
Result := It.Current_Token;
end if;
return Result;
end Current;
-----------------------------------------------------------------------------
function To_String (Tok : Token) return E_Strings.T is
--# hide To_String;
Result : E_Strings.T := E_Strings.Empty_String;
begin
E_Strings.Append_String (E_Str => Result,
Str => SP_Symbols.SP_Terminal'Image (Tok.Kind) & ": ");
E_Strings.Append_Examiner_String (E_Str1 => Result,
E_Str2 => Tok.Value);
return Result;
end To_String;
end TokenManager;
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