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|
------------------------------------------------------------------------------
-- --
-- GNATPP COMPONENTS --
-- --
-- G N A T P P . S O U R C E _ L I N E _ B U F F E R --
-- --
-- B o d y --
-- --
-- Copyright (C) 2001-2004, ACT Europe --
-- --
-- GNATPP 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. GNATPP is distributed in the hope that it will be useful, but --
-- WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABI- --
-- LITY 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, --
-- --
-- GNATPP is maintained by ACT Europe (http://www.act-europe.fr). --
-- --
------------------------------------------------------------------------------
with Ada.Characters.Handling; use Ada.Characters.Handling;
with Asis.Text; use Asis.Text;
with GNATPP.Common;
with GNATPP.State; use GNATPP.State;
package body GNATPP.Source_Line_Buffer is
Wide_HT : constant Wide_Character := To_Wide_Character (ASCII.HT);
Old_Current_Line : Line_Number_Positive;
Old_Line_Pos : Natural;
-- These variables are used to save and to restore the content of the
-- line buffer
-----------------------
-- Local subprograms --
-----------------------
function Skip_Blanks return Natural;
-- Returns the index of the first non-blank position which follows
-- Line_Pos (ASCII.HT is considered as blank). If the rest of the line
-- in the line buffer contains only blanks, this function returns 0.
function Is_While_Space (W_Ch : Wide_Character) return Boolean;
-- Checks if the argument is the space of HT character.
----------------------
-- Detect_Delimiter --
----------------------
procedure Detect_Delimiter is
begin
case Line_Buf (Line_Pos) is
when '&' =>
Delimiter := Ampersand_Dlm;
when ''' =>
Delimiter := Tick_Dlm;
when '(' =>
Delimiter := Left_Parenthesis_Dlm;
when ')' =>
Delimiter := Right_Parenthesis_Dlm;
when '*' =>
if Line_Pos < Line_Len and then
Line_Buf (Line_Pos + 1) = '*'
then
Delimiter := Double_Star_Dlm;
else
Delimiter := Asterisk_Dlm;
end if;
when '+' =>
Delimiter := Plus_Dlm;
when ',' =>
Delimiter := Comma_Dlm;
when '-' =>
-- This function is not supposed to be called in the situation
-- when Line_Pos points to the beginning of a comment
Delimiter := Minus_Dlm;
when '.' =>
if Line_Pos < Line_Len and then
Line_Buf (Line_Pos + 1) = '.'
then
Delimiter := Double_Dot_Dlm;
else
Delimiter := Dot_Dlm;
end if;
when '/' =>
if Line_Pos < Line_Len and then
Line_Buf (Line_Pos + 1) = '='
then
Delimiter := Inequality_Dlm;
else
Delimiter := Divide_Dlm;
end if;
when ':' =>
if Line_Pos < Line_Len and then
Line_Buf (Line_Pos + 1) = '='
then
Delimiter := Assignment_Dlm;
else
Delimiter := Colon_Dlm;
end if;
when ';' =>
Delimiter := Semicolon_Dlm;
when '<' =>
if Line_Pos < Line_Len and then
Line_Buf (Line_Pos + 1) = '='
then
Delimiter := Less_Or_Equal_Dlm;
elsif Line_Pos < Line_Len and then
Line_Buf (Line_Pos + 1) = '>'
then
Delimiter := Box_Dlm;
elsif Line_Pos < Line_Len and then
Line_Buf (Line_Pos + 1) = '<'
then
Delimiter := Left_Label_Bracket_Dlm;
else
Delimiter := Less_Than_Dlm;
end if;
when '=' =>
if Line_Pos < Line_Len and then
Line_Buf (Line_Pos + 1) = '>'
then
Delimiter := Arrow_Dlm;
else
Delimiter := Equals_Dlm;
end if;
when '|' =>
Delimiter := Vertical_Line_Dlm;
when '!' =>
Delimiter := Exclamation_Mark_Dlm;
when '>' =>
if Line_Pos < Line_Len and then
Line_Buf (Line_Pos + 1) = '='
then
Delimiter := Greater_Or_Equal_Dlm;
elsif Line_Pos < Line_Len and then
Line_Buf (Line_Pos + 1) = '>'
then
Delimiter := Right_Label_Bracket_Dlm;
else
Delimiter := Greater_Than_Dlm;
end if;
when others =>
Delimiter := Not_A_Dlm;
end case;
end Detect_Delimiter;
--------------------
-- Detect_Keyword --
--------------------
procedure Detect_Keyword is
begin
Keyword := Not_A_KW;
Skip_Blanks;
if not (Current_Line = GNATPP.Common.The_Last_Line and then
Line_Pos = 0)
then
Set_Word_End;
if Word_End > 0 and then
Line_Buf (Word_End) = ';'
then
Word_End := Word_End - 1;
end if;
declare
Word : constant Program_Text := Normalized_Word;
begin
if Word = Abort_String then
Keyword := KW_Abort;
elsif Word = Abs_String then
Keyword := KW_Abs;
elsif Word = Abstract_String then
Keyword := KW_Abstract;
elsif Word = Accept_String then
Keyword := KW_Accept;
elsif Word = Access_String then
Keyword := KW_Access;
elsif Word = Aliased_String then
Keyword := KW_Aliased;
elsif Word = All_String then
Keyword := KW_All;
elsif Word = And_String then
Keyword := KW_And;
elsif Word = Array_String then
Keyword := KW_Array;
elsif Word = At_String then
Keyword := KW_At;
elsif Word = Begin_String then
Keyword := KW_Begin;
elsif Word = Body_String then
Keyword := KW_Body;
elsif Word = Case_String then
Keyword := KW_Case;
elsif Word = Constant_String then
Keyword := KW_Constant;
elsif Word = Declare_String then
Keyword := KW_Declare;
elsif Word = Delay_String then
Keyword := KW_Delay;
elsif Word = Delta_String then
Keyword := KW_Delta;
elsif Word = Digits_String then
Keyword := KW_Digits;
elsif Word = Do_String then
Keyword := KW_Do;
elsif Word = Else_String then
Keyword := KW_Else;
elsif Word = Elsif_String then
Keyword := KW_Elsif;
elsif Word = End_String then
Keyword := KW_End;
elsif Word = Entry_String then
Keyword := KW_Entry;
elsif Word = Exception_String then
Keyword := KW_Exception;
elsif Word = Exit_String then
Keyword := KW_Exit;
elsif Word = For_String then
Keyword := KW_For;
elsif Word = Function_String then
Keyword := KW_Function;
elsif Word = Generic_String then
Keyword := KW_Generic;
elsif Word = Goto_String then
Keyword := KW_Goto;
elsif Word = If_String then
Keyword := KW_If;
elsif Word = In_String then
Keyword := KW_In;
elsif Word = KW_Is_String then
Keyword := KW_Is;
elsif Word = Limited_String then
Keyword := KW_Limited;
elsif Word = Loop_String then
Keyword := KW_Loop;
elsif Word = Mod_String then
Keyword := KW_Mod;
elsif Word = New_String then
Keyword := KW_New;
elsif Word = Not_String then
Keyword := KW_Not;
elsif Word = Null_String then
Keyword := KW_Null;
elsif Word = Of_String then
Keyword := KW_Of;
elsif Word = Or_String then
Keyword := KW_Or;
elsif Word = Others_String then
Keyword := KW_Others;
elsif Word = Out_String then
Keyword := KW_Out;
elsif Word = Package_String then
Keyword := KW_Package;
elsif Word = Pragma_String then
Keyword := KW_Pragma;
elsif Word = Private_String then
Keyword := KW_Private;
elsif Word = Procedure_String then
Keyword := KW_Procedure;
elsif Word = Protected_String then
Keyword := KW_Protected;
elsif Word = Raise_String then
Keyword := KW_Raise;
elsif Word = Range_String then
Keyword := KW_Range;
elsif Word = Record_String then
Keyword := KW_Record;
elsif Word = Rem_String then
Keyword := KW_Rem;
elsif Word = Renames_String then
Keyword := KW_Renames;
elsif Word = Requeue_String then
Keyword := KW_Requeue;
elsif Word = Return_String then
Keyword := KW_Return;
elsif Word = Reverse_String then
Keyword := KW_Reverse;
elsif Word = Select_String then
Keyword := KW_Select;
elsif Word = Separate_String then
Keyword := KW_Separate;
elsif Word = Subtype_String then
Keyword := KW_Subtype;
elsif Word = Tagged_String then
Keyword := KW_Tagged;
elsif Word = Task_String then
Keyword := KW_Task;
elsif Word = Terminate_String then
Keyword := KW_Terminate;
elsif Word = Then_String then
Keyword := KW_Then;
elsif Word = Type_String then
Keyword := KW_Type;
elsif Word = Until_String then
Keyword := KW_Until;
elsif Word = Use_String then
Keyword := KW_Use;
elsif Word = When_String then
Keyword := KW_When;
elsif Word = While_String then
Keyword := KW_While;
elsif Word = With_String then
Keyword := KW_With;
elsif Word = Xor_String then
Keyword := KW_Xor;
end if;
end;
end if;
end Detect_Keyword;
-------------------------
-- End_Of_Line_Comment --
-------------------------
function End_Of_Line_Comment return Boolean is
Result : Boolean := False;
Idx : constant Natural := Skip_Blanks;
begin
if not (Idx = 0 or else
Idx = Line_Len)
then
Result := Line_Buf (Idx) = '-' and then
Line_Buf (Idx + 1) = '-';
Line_Pos := Idx;
end if;
return Result;
end End_Of_Line_Comment;
-----------------
-- Get_End_Idx --
-----------------
function Get_End_Idx return Natural is
Result : Natural := 0;
begin
for J in reverse Line_Pos .. Line_Len loop
if not (Line_Buf (J) = ' ' or else
Line_Buf (J) = To_Wide_Character (ASCII.HT))
then
Result := J;
exit;
end if;
end loop;
return Result;
end Get_End_Idx;
---------------
-- In_Buffer --
---------------
procedure In_Buffer (Str_Num : Line_Number_Positive) is
The_line : constant Line := Lines_Table.Table (Str_Num);
begin
GNATPP.State.Current_Line := Str_Num;
Line_Len := Length (The_line);
Line_Buf (1 .. Line_Len) := Line_Image (The_line);
if Line_Len = 0 then
Line_Pos := 0;
else
Line_Pos := 1;
end if;
end In_Buffer;
-------------------
-- Is_Blank_Line --
-------------------
function Is_Blank_Line return Boolean is
begin
return Skip_Blanks = 0;
end Is_Blank_Line;
--------------------
-- Is_While_Space --
--------------------
function Is_While_Space (W_Ch : Wide_Character) return Boolean is
begin
return W_Ch = ' ' or else W_Ch = Wide_HT;
end Is_While_Space;
-------------------------
-- Next_Line_In_Buffer --
-------------------------
procedure Next_Line_In_Buffer is
begin
if Current_Line < GNATPP.Common.The_Last_Line then
In_Buffer (Current_Line + 1);
else
Line_Pos := 0;
end if;
end Next_Line_In_Buffer;
---------------------
-- Normalized_Word --
---------------------
function Normalized_Word return Program_Text is
Result : Program_Text := Line_Buf (Line_Pos .. Word_End);
begin
if Is_String (Result) then
Result := To_Wide_String (To_Lower (To_String (Result)));
end if;
return Result;
end Normalized_Word;
-----------------
-- Restore_Buf --
-----------------
procedure Restore_Buf is
begin
In_Buffer (Old_Current_Line);
Line_Pos := Old_Line_Pos;
end Restore_Buf;
--------------
-- Save_Buf --
--------------
procedure Save_Buf is
begin
Old_Current_Line := Current_Line;
Old_Line_Pos := Line_Pos;
end Save_Buf;
------------------
-- Set_Word_End --
------------------
procedure Set_Word_End is
begin
Word_End := Line_Pos;
if Word_End /= 0 then
while Word_End < Line_Len loop
if not (Is_Alphanumeric (To_Character (Line_Buf (Word_End)))
or else
To_Character (Line_Buf (Word_End)) = '_')
then
exit;
else
Word_End := Word_End + 1;
end if;
end loop;
if not Is_Alphanumeric (To_Character (Line_Buf (Word_End))) then
Word_End := Word_End - 1;
end if;
end if;
end Set_Word_End;
-----------------------------
-- Set_Word_End_In_Comment --
-----------------------------
procedure Set_Word_End_In_Comment is
begin
Word_End := Line_Pos;
if Word_End /= 0 then
while Word_End < Line_Len loop
if Is_While_Space (Line_Buf (Word_End)) then
exit;
else
Word_End := Word_End + 1;
end if;
end loop;
if Is_While_Space (Line_Buf (Word_End)) then
Word_End := Word_End - 1;
end if;
end if;
end Set_Word_End_In_Comment;
-----------------
-- Skip_Blanks --
-----------------
function Skip_Blanks return Natural is
Result : Natural := Line_Pos;
begin
HT_Passed := False;
if Result > Line_Len then
Result := 0;
elsif Result > 0 then
while Line_Buf (Result) = ' ' or else
Line_Buf (Result) = To_Wide_Character (ASCII.HT) or else
Line_Buf (Result) = To_Wide_Character (ASCII.FF) or else
Line_Buf (Result) = To_Wide_Character (ASCII.VT)
loop
Result := Result + 1;
if Result > Line_Len then
Result := 0;
HT_Passed := False;
exit;
end if;
if Line_Buf (Result) = To_Wide_Character (ASCII.HT) then
HT_Passed := True;
end if;
end loop;
end if;
return Result;
end Skip_Blanks;
-----------------
-- Skip_Blanks --
-----------------
procedure Skip_Blanks is
begin
Line_Pos := Skip_Blanks;
end Skip_Blanks;
---------------
-- Skip_Word --
---------------
procedure Skip_Word is
begin
Skip_Blanks;
if Line_Pos > 0 then
-- skipping the word
while not (Line_Buf (Line_Pos) = ' ' or else
Line_Buf (Line_Pos) = To_Wide_Character (ASCII.HT))
and then
Line_Pos <= Line_Len
loop
Line_Pos := Line_Pos + 1;
end loop;
Skip_Blanks;
end if;
end Skip_Word;
end GNATPP.Source_Line_Buffer;
|
