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|
-- GHDL Run Time (GRT) - 'value subprograms.
-- Copyright (C) 2002, 2003, 2004, 2005 Tristan Gingold
--
-- GHDL 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, or (at your option) any later
-- version.
--
-- GHDL 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 GCC; see the file COPYING. If not, write to the Free
-- Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-- 02111-1307, USA.
with Grt.Errors; use Grt.Errors;
package body Grt.Values is
NBSP : constant Character := Character'Val (160);
HT : constant Character := Character'Val (9);
function Ghdl_Value_I32 (Str : Std_String_Ptr) return Ghdl_I32
is
S : constant Std_String_Basep := Str.Base;
Len : constant Ghdl_Index_Type := Str.Bounds.Dim_1.Length;
Pos : Ghdl_Index_Type := 0;
C : Character;
Sep : Character;
Val, D, Base : Ghdl_I32;
Exp : Integer;
begin
-- LRM 14.1
-- Leading [and trailing] whitespace is allowed and ignored.
--
-- GHDL: allow several leading whitespace.
while Pos < Len loop
case S (Pos) is
when ' '
| NBSP
| HT =>
Pos := Pos + 1;
when others =>
exit;
end case;
end loop;
if Pos = Len then
Error_E ("'value: empty string");
end if;
C := S (Pos);
-- Be user friendly.
if C = '-' or C = '+' then
Error_E ("'value: leading sign +/- not allowed");
end if;
Val := 0;
loop
if C in '0' .. '9' then
Val := Val * 10 + Character'Pos (C) - Character'Pos ('0');
Pos := Pos + 1;
exit when Pos >= Len;
C := S (Pos);
else
Error_E ("'value: decimal digit expected");
end if;
case C is
when '_' =>
Pos := Pos + 1;
if Pos >= Len then
Error_E ("'value: trailing underscore");
end if;
C := S (Pos);
when '#'
| ':'
| 'E'
| 'e' =>
exit;
when ' '
| NBSP
| HT =>
Pos := Pos + 1;
exit;
when others =>
null;
end case;
end loop;
if Pos >= Len then
return Val;
end if;
if C = '#' or C = ':' then
Base := Val;
Val := 0;
Sep := C;
Pos := Pos + 1;
if Base < 2 or Base > 16 then
Error_E ("'value: bad base");
end if;
if Pos >= Len then
Error_E ("'value: missing based integer");
end if;
C := S (Pos);
loop
case C is
when '0' .. '9' =>
D := Character'Pos (C) - Character'Pos ('0');
when 'a' .. 'f' =>
D := Character'Pos (C) - Character'Pos ('a') + 10;
when 'A' .. 'F' =>
D := Character'Pos (C) - Character'Pos ('A') + 10;
when others =>
Error_E ("'value: digit expected");
end case;
if D > Base then
Error_E ("'value: digit greather than base");
end if;
Val := Val * Base + D;
Pos := Pos + 1;
if Pos >= Len then
Error_E ("'value: missing end sign number");
end if;
C := S (Pos);
if C = '#' or C = ':' then
if C /= Sep then
Error_E ("'value: sign number mismatch");
end if;
Pos := Pos + 1;
exit;
elsif C = '_' then
Pos := Pos + 1;
if Pos >= Len then
Error_E ("'value: no character after underscore");
end if;
C := S (Pos);
end if;
end loop;
else
Base := 10;
end if;
-- Handle exponent.
if C = 'e' or C = 'E' then
Pos := Pos + 1;
if Pos >= Len then
Error_E ("'value: no character after exponent");
end if;
C := S (Pos);
if C = '+' then
Pos := Pos + 1;
if Pos >= Len then
Error_E ("'value: no character after sign");
end if;
C := S (Pos);
elsif C = '-' then
Error_E ("'value: negativ exponent not allowed");
end if;
Exp := 0;
loop
if C in '0' .. '9' then
Exp := Exp * 10 + Character'Pos (C) - Character'Pos ('0');
Pos := Pos + 1;
exit when Pos >= Len;
C := S (Pos);
else
Error_E ("'value: decimal digit expected");
end if;
case C is
when '_' =>
Pos := Pos + 1;
if Pos >= Len then
Error_E ("'value: trailing underscore");
end if;
C := S (Pos);
when ' '
| NBSP
| HT =>
Pos := Pos + 1;
exit;
when others =>
null;
end case;
end loop;
while Exp > 0 loop
if Exp mod 2 = 1 then
Val := Val * Base;
end if;
Exp := Exp / 2;
Base := Base * Base;
end loop;
end if;
-- LRM 14.1
-- [Leading] and trailing whitespace is allowed and ignored.
--
-- GHDL: allow several leading whitespace.
while Pos < Len loop
case S (Pos) is
when ' '
| NBSP
| HT =>
Pos := Pos + 1;
when others =>
Error_E ("'value: trailing characters after blank");
end case;
end loop;
return Val;
end Ghdl_Value_I32;
end Grt.Values;
|
