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226 | -- Abstract :
--
-- See spec.
--
-- Copyright (C) 2009-2010, 2012-2015, 2017 - 2023 Stephen Leake. All Rights Reserved.
--
-- This program 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. This program 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 this program; see file COPYING. If not, write to
-- the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
-- MA 02111-1307, USA.
pragma License (GPL);
with AUnit.Assertions;
with Ada.Characters.Latin_1;
with Ada.Text_IO;
with WisiToken.AUnit;
with WisiToken.Gen_Token_Enum;
with WisiToken.Generate.LR.LALR_Generate;
with WisiToken.Lexer.Regexp;
with WisiToken.Parse.LR.Parser;
with WisiToken.Productions;
with WisiToken.Syntax_Trees;
with WisiToken.Text_IO_Trace;
with WisiToken.Wisi_Ada;
package body Test_LR_Expecting_Terminal_Sequence is
package Simple is
-- A simple grammar for testing the Expecting function for generating nice error messages.
--
-- legal statments:
--
-- set foo = integer;
-- verify foo = integer +- integer;
--
-- Nice errors:
--
-- foo; => expecting 'set, verify'
-- set foo bar; => "expecting '='
-- etc
type Token_ID is
(Whitespace_ID,
Equals_ID,
Int_ID,
Plus_Minus_ID,
Semicolon_ID,
Set_ID,
Verify_ID,
-- Identifier must be after keywords, so they are recognized instead
Identifier_ID,
EOI_ID,
-- non-terminals
Parse_Sequence_ID,
Statement_ID,
SOI_ID);
package Token_Enum is new WisiToken.Gen_Token_Enum
(Token_Enum_ID => Token_ID,
First_Terminal => Equals_ID,
Last_Terminal => EOI_ID,
First_Nonterminal => Parse_Sequence_ID,
Last_Nonterminal => Statement_ID,
SOI_ID => SOI_ID,
EOI_ID => EOI_ID,
Accept_ID => Parse_Sequence_ID,
Case_Insensitive => False);
use Token_Enum;
package Set_Statement is
use WisiToken.Wisi_Ada;
Grammar : constant WisiToken.Productions.Prod_Arrays.Vector :=
-- set symbol = value
+(Statement_ID <= Set_ID & Identifier_ID & Equals_ID & Int_ID + WisiToken.Syntax_Trees.Null_Action);
end Set_Statement;
package Verify_Statement is
use WisiToken.Wisi_Ada;
Grammar : constant WisiToken.Productions.Prod_Arrays.Vector :=
-- verify symbol = value +- tolerance
+(Statement_ID <= Verify_ID & Identifier_ID & Equals_ID & Int_ID & Plus_Minus_ID & Int_ID +
WisiToken.Syntax_Trees.Null_Action);
end Verify_Statement;
package Lexer renames WisiToken.Lexer.Regexp;
Syntax : constant Lexer.Syntax := To_Syntax
((
Whitespace_ID => Lexer.Get (" ", Report => False),
Equals_ID => Lexer.Get ("="),
Int_ID => Lexer.Get ("[0-9]+"),
Plus_Minus_ID => Lexer.Get ("\+-"),
Semicolon_ID => Lexer.Get (";"),
Set_ID => Lexer.Get ("set"),
Verify_ID => Lexer.Get ("verify"),
Identifier_ID => Lexer.Get ("[0-9a-zA-Z_]+"),
EOI_ID => Lexer.Get ("" & Ada.Characters.Latin_1.EOT)
));
package Top_Level is
use WisiToken.Wisi_Ada;
Grammar : WisiToken.Productions.Prod_Arrays.Vector :=
+(Parse_Sequence_ID <= Statement_ID & Semicolon_ID & EOI_ID + WisiToken.Syntax_Trees.Null_Action) and
Set_Statement.Grammar and
Verify_Statement.Grammar;
end Top_Level;
Parser : WisiToken.Parse.LR.Parser.Parser;
Trace : aliased WisiToken.Text_IO_Trace.Trace;
Log_File : Ada.Text_IO.File_Type;
procedure Execute
(Command : in String;
Expected : in WisiToken.Token_ID_Set);
end Simple;
package body Simple is
procedure Execute
(Command : in String;
Expected : in WisiToken.Token_ID_Set)
is begin
Parser.Tree.Lexer.Reset_With_String (Command);
Parser.Parse (Log_File);
AUnit.Assertions.Assert (False, "'" & Command & "'; no exception");
exception
when WisiToken.Parse_Error =>
if WisiToken.Trace_Tests > WisiToken.Detail then
Ada.Text_IO.Put_Line ("parse result:");
Parser.Tree.Print_Tree;
end if;
declare
Error_Ref : constant WisiToken.Syntax_Trees.Stream_Error_Ref := Parser.Tree.First_Error
(Parser.Tree.First_Parse_Stream);
Error : constant WisiToken.Syntax_Trees.Error_Data'Class := WisiToken.Syntax_Trees.Error (Error_Ref);
begin
AUnit.Assertions.Assert (Error in WisiToken.Parse.Parse_Error, "not a Parse_Error");
WisiToken.AUnit.Check (Command, WisiToken.Parse.Parse_Error (Error).Expecting, Expected);
end;
end Execute;
end Simple;
----------
-- Test procedures
procedure Test_Expecting (T : in out AUnit.Test_Cases.Test_Case'Class)
is
pragma Unreferenced (T);
use Simple;
use Simple.Token_Enum;
First : WisiToken.Token_ID renames LR1_Descriptor.First_Terminal;
Last : WisiToken.Token_ID renames LR1_Descriptor.Last_Terminal;
Recursions : WisiToken.Generate.Recursions := WisiToken.Generate.Empty_Recursions;
begin
WisiToken.Parse.LR.Parser.New_Parser
(Parser,
Lexer.New_Lexer (Trace'Access, LALR_Descriptor'Access, Syntax),
WisiToken.Generate.LR.LALR_Generate.Generate
(Top_Level.Grammar, WisiToken.Precedence_Lists_Arrays.Empty_Vector, LALR_Descriptor,
Grammar_File_Name => "", Error_Recover => False,
Recursions => Recursions),
WisiToken.Syntax_Trees.Production_Info_Trees.Empty_Vector,
User_Data => null,
Language_Fixes => null,
Language_Matching_Begin_Tokens => null,
Language_String_ID_Set => null);
Execute
("set A = 2",
WisiToken.To_Token_ID_Set (First, Last, (1 => +Semicolon_ID)));
Execute
("set A = ",
WisiToken.To_Token_ID_Set (First, Last, (1 => +Int_ID)));
Execute
("set A",
WisiToken.To_Token_ID_Set (First, Last, (1 => +Equals_ID)));
Execute
("set",
WisiToken.To_Token_ID_Set
(First, Last, (1 => +Identifier_ID)));
Execute
("2",
WisiToken.To_Token_ID_Set
(First, Last, (+Set_ID, +Verify_ID)));
end Test_Expecting;
----------
-- Public subprograms
overriding procedure Register_Tests (T : in out Test_Case)
is
use AUnit.Test_Cases.Registration;
begin
Register_Routine (T, Test_Expecting'Access, "Test_Expecting");
end Register_Tests;
overriding function Name (T : Test_Case) return AUnit.Message_String
is
pragma Unreferenced (T);
begin
return new String'("test_lr_expecting_terminal_sequence.adb");
end Name;
end Test_LR_Expecting_Terminal_Sequence;
|