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-- --
-- --
-- S C N --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2003 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 Atree; use Atree;
with Csets; use Csets;
with Hostparm;
with Namet; use Namet;
with Opt; use Opt;
with Scans; use Scans;
with Sinfo; use Sinfo;
with Sinput; use Sinput;
package body Scn is
use ASCII;
Used_As_Identifier : array (Token_Type) of Boolean;
-- Flags set True if a given keyword is used as an identifier (used to
-- make sure that we only post an error message for incorrect use of a
-- keyword as an identifier once for a given keyword).
procedure Check_End_Of_Line;
-- Called when end of line encountered. Checks that line is not
-- too long, and that other style checks for the end of line are met.
function Determine_License return License_Type;
-- Scan header of file and check that it has an appropriate GNAT-style
-- header with a proper license statement. Returns GPL, Unrestricted,
-- or Modified_GPL depending on header. If none of these, returns Unknown.
procedure Error_Long_Line;
-- Signal error of excessively long line
-- Post_Scan --
procedure Post_Scan is
case Token is
when Tok_Char_Literal =>
Token_Node := New_Node (N_Character_Literal, Token_Ptr);
Set_Char_Literal_Value (Token_Node, Character_Code);
Set_Chars (Token_Node, Token_Name);
when Tok_Identifier =>
Token_Node := New_Node (N_Identifier, Token_Ptr);
Set_Chars (Token_Node, Token_Name);
when Tok_Real_Literal =>
Token_Node := New_Node (N_Real_Literal, Token_Ptr);
Set_Realval (Token_Node, Real_Literal_Value);
when Tok_Integer_Literal =>
Token_Node := New_Node (N_Integer_Literal, Token_Ptr);
Set_Intval (Token_Node, Int_Literal_Value);
when Tok_String_Literal =>
Token_Node := New_Node (N_String_Literal, Token_Ptr);
Set_Has_Wide_Character (Token_Node, Wide_Character_Found);
Set_Strval (Token_Node, String_Literal_Id);
when Tok_Operator_Symbol =>
Token_Node := New_Node (N_Operator_Symbol, Token_Ptr);
Set_Chars (Token_Node, Token_Name);
Set_Strval (Token_Node, String_Literal_Id);
when others =>
end case;
end Post_Scan;
-- Check_End_Of_Line --
procedure Check_End_Of_Line is
Len : constant Int := Int (Scan_Ptr) - Int (Current_Line_Start);
if Len > Hostparm.Max_Line_Length then
elsif Style_Check then
Style.Check_Line_Terminator (Len);
end if;
end Check_End_Of_Line;
-- Determine_License --
function Determine_License return License_Type is
GPL_Found : Boolean := False;
function Contains (S : String) return Boolean;
-- See if current comment contains successive non-blank characters
-- matching the contents of S. If so leave Scan_Ptr unchanged and
-- return True, otherwise leave Scan_Ptr unchanged and return False.
procedure Skip_EOL;
-- Skip to line terminator character
-- Contains --
function Contains (S : String) return Boolean is
CP : Natural;
SP : Source_Ptr;
SS : Source_Ptr;
SP := Scan_Ptr;
while Source (SP) /= CR and then Source (SP) /= LF loop
if Source (SP) = S (S'First) then
SS := SP;
CP := S'First;
SS := SS + 1;
CP := CP + 1;
if CP > S'Last then
return True;
end if;
while Source (SS) = ' ' loop
SS := SS + 1;
end loop;
exit when Source (SS) /= S (CP);
end loop;
end if;
SP := SP + 1;
end loop;
return False;
end Contains;
-- Skip_EOL --
procedure Skip_EOL is
while Source (Scan_Ptr) /= CR
and then Source (Scan_Ptr) /= LF
Scan_Ptr := Scan_Ptr + 1;
end loop;
end Skip_EOL;
-- Start of processing for Determine_License
if Source (Scan_Ptr) /= '-'
or else Source (Scan_Ptr + 1) /= '-'
if GPL_Found then
return GPL;
return Unknown;
end if;
elsif Contains ("Asaspecialexception") then
if GPL_Found then
return Modified_GPL;
end if;
elsif Contains ("GNUGeneralPublicLicense") then
GPL_Found := True;
or else
return Unrestricted;
end if;
Physical : Boolean;
Skip_Line_Terminators (Scan_Ptr, Physical);
-- If we are at start of physical line, update scan pointers
-- to reflect the start of the new line.
if Physical then
Current_Line_Start := Scan_Ptr;
Start_Column := Scanner.Set_Start_Column;
First_Non_Blank_Location := Scan_Ptr;
end if;
end loop;
end Determine_License;
-- Determine_Token_Casing --
function Determine_Token_Casing return Casing_Type is
return Scanner.Determine_Token_Casing;
end Determine_Token_Casing;
-- Error_Long_Line --
procedure Error_Long_Line is
("this line is too long",
Current_Line_Start + Hostparm.Max_Line_Length);
end Error_Long_Line;
-- Initialize_Scanner --
procedure Initialize_Scanner
(Unit : Unit_Number_Type;
Index : Source_File_Index)
GNAT_Hedr : constant Text_Buffer (1 .. 78) := (others => '-');
Scanner.Initialize_Scanner (Unit, Index);
-- Set default for Comes_From_Source (except if we are going to process
-- an artificial string internally created within the compiler and
-- placed into internal source duffer). All nodes built now until we
-- reenter the analyzer will have Comes_From_Source set to True
if Index /= Internal_Source_File then
Set_Comes_From_Source_Default (True);
end if;
-- Check license if GNAT type header possibly present
if Source_Last (Index) - Scan_Ptr > 80
and then Source (Scan_Ptr .. Scan_Ptr + 77) = GNAT_Hedr
Set_License (Current_Source_File, Determine_License);
end if;
-- Because of the License stuff above, Scng.Initialize_Scanner cannot
-- call Scan. Scan initial token (note this initializes Prev_Token,
-- Prev_Token_Ptr).
-- There are two reasons not to do the Scan step in case if we
-- initialize the scanner for the internal source buffer:
-- - The artificial string may not be created by the compiler in this
-- buffer when we call Initialize_Scanner
-- - For these artificial strings a special way of scanning is used, so
-- the standard step of the scanner may just break the algorithm of
-- processing these strings.
if Index /= Internal_Source_File then
end if;
-- Clear flags for reserved words used as indentifiers
for J in Token_Type loop
Used_As_Identifier (J) := False;
end loop;
end Initialize_Scanner;
-- Scan_Reserved_Identifier --
procedure Scan_Reserved_Identifier (Force_Msg : Boolean) is
Token_Chars : constant String := Token_Type'Image (Token);
-- We have in Token_Chars the image of the Token name, i.e. Tok_xxx.
-- This code extracts the xxx and makes an identifier out of it.
Name_Len := 0;
for J in 5 .. Token_Chars'Length loop
Name_Len := Name_Len + 1;
Name_Buffer (Name_Len) := Fold_Lower (Token_Chars (J));
end loop;
Token_Name := Name_Find;
if not Used_As_Identifier (Token) or else Force_Msg then
Error_Msg_Name_1 := Token_Name;
Error_Msg_SC ("reserved word* cannot be used as identifier!");
Used_As_Identifier (Token) := True;
end if;
Token := Tok_Identifier;
Token_Node := New_Node (N_Identifier, Token_Ptr);
Set_Chars (Token_Node, Token_Name);
end Scan_Reserved_Identifier;
end Scn;