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-- Lexical analysis for protect directive.
-- Copyright (C) 2019 Tristan Gingold
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 2 of the License, 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
-- along with this program. If not, see <gnu.org/licenses>.
separate (Vhdl.Scanner)
package body Directive_Protect is
function Scan_Expression_List return Boolean;
-- Scan/parse a keyword expression.
-- Initial spaces must have been skipped.
-- Return False in case of error.
function Scan_Keyword_Expression return Boolean is
begin
if Characters_Kind (Source (Pos)) not in Letter then
Error_Msg_Scan ("identifier expected in protect directive");
return False;
end if;
Scan_Identifier (False);
if Current_Token /= Tok_Identifier then
Error_Msg_Scan (+Get_Token_Location, "keyword must be an identifier");
return False;
end if;
Skip_Spaces;
if Source (Pos) /= '=' then
return True;
end if;
-- Eat '='.
Pos := Pos + 1;
Skip_Spaces;
case Source (Pos) is
when 'A' .. 'Z' | 'a' .. 'z' =>
Scan_Identifier (False);
when '0' .. '9' =>
Scan_Literal;
when '"' =>
Scan_String;
when '(' =>
-- Eat '('.
Pos := Pos + 1;
Skip_Spaces;
if not Scan_Expression_List then
return False;
end if;
Skip_Spaces;
if Source (Pos) /= ')' then
Error_Msg_Scan ("')' expected at end of protect keyword list");
return False;
end if;
-- Eat ')'.
Pos := Pos + 1;
when others =>
-- Ok, we don't handle all the letters, nor extended identifiers.
Error_Msg_Scan ("literal expected in protect tool directive");
return False;
end case;
return True;
end Scan_Keyword_Expression;
-- Scan: keyword_expression { , keyword_expression }
function Scan_Expression_List return Boolean is
begin
loop
if not Scan_Keyword_Expression then
return False;
end if;
Skip_Spaces;
if Source (Pos) /= ',' then
return True;
end if;
-- Eat ','.
Pos := Pos + 1;
Skip_Spaces;
end loop;
end Scan_Expression_List;
-- LRM08 24.1 Protect tool directives
-- protect_directive ::=
-- `PROTECT keyword_expression {, keyword_expression }
procedure Scan_Protect_Directive is
begin
if Scan_Expression_List then
if not Is_EOL (Source (Pos)) then
Error_Msg_Scan ("end of line expected in protect directive");
end if;
end if;
Skip_Until_EOL;
end Scan_Protect_Directive;
end Directive_Protect;
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