1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
10 -- Copyright (C) 2000-2001 Free Software Foundation, Inc. --
12 -- GNAT is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNAT; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
23 -- As a special exception, if other files instantiate generics from this --
24 -- unit, or you link this unit with other files to produce an executable, --
25 -- this unit does not by itself cause the resulting executable to be --
26 -- covered by the GNU General Public License. This exception does not --
27 -- however invalidate any other reasons why the executable file might be --
28 -- covered by the GNU Public License. --
30 -- GNAT was originally developed by the GNAT team at New York University. --
31 -- Extensive contributions were provided by Ada Core Technologies Inc. --
33 ------------------------------------------------------------------------------
35 with Ada.Exceptions; use Ada.Exceptions;
37 package body SFN_Scan is
40 -- Allow easy access to control character definitions
42 type String_Ptr is access String;
45 -- Points to the gnat.adc input file
48 -- Subscript of next character to process in S
51 -- Current line number
53 Start_Of_Line : Natural;
54 -- Subscript of first character at start of current line
56 ----------------------
57 -- Local Procedures --
58 ----------------------
60 function Acquire_String (B : Natural; E : Natural) return String;
61 -- This function takes a string scanned out by Scan_String, strips
62 -- the enclosing quote characters and any internal doubled quote
63 -- characters, and returns the result as a String. The arguments
64 -- B and E are as returned from a call to Scan_String. The lower
65 -- bound of the string returned is always 1.
67 function Acquire_Unit_Name return String;
68 -- Skips white space, and then scans and returns a unit name. The
69 -- unit name is cased exactly as it appears in the source file.
70 -- The terminating character must be white space, or a comma or
71 -- a right parenthesis or end of file.
73 function At_EOF return Boolean;
74 pragma Inline (At_EOF);
75 -- Returns True if at end of file, False if not. Note that this
76 -- function does NOT skip white space, so P is always unchanged.
78 procedure Check_Not_At_EOF;
79 pragma Inline (Check_Not_At_EOF);
80 -- Skips past white space if any, and then raises Error if at
81 -- end of file. Otherwise returns with P skipped past whitespace.
83 function Check_File_Type return Character;
84 -- Skips white space if any, and then looks for any of the tokens
85 -- Spec_File_Name, Body_File_Name, or Subunit_File_Name. If one
86 -- of these is found then the value returned is 's', 'b' or 'u'
87 -- respectively, and P is bumped past the token. If none of
88 -- these tokens is found, then P is unchanged (except for
89 -- possible skip of white space), and a space is returned.
91 function Check_Token (T : String) return Boolean;
92 -- Skips white space if any, and then checks if the string at the
93 -- current location matches the given string T, and the character
94 -- immediately following is non-alphabetic, non-numeric. If so,
95 -- P is stepped past the token, and True is returned. If not,
96 -- P is unchanged (except for possibly skipping past whitespace),
97 -- and False is returned. S may contain only lower-case letters
100 procedure Error (Err : String);
101 -- Called if an error is detected. Raises Syntax_Error_In_GNAT_ADC
102 -- with a message of the form gnat.adc:line:col: xxx, where xxx is
103 -- the string Err passed as a parameter.
105 procedure Require_Token (T : String);
106 -- Skips white space if any, and then requires the given string
107 -- to be present. If it is, the P is stepped past it, otherwise
108 -- Error is raised, since this is a syntax error. Require_Token
109 -- is used only for sequences of special characters, so there
110 -- is no issue of terminators, or casing of letters.
112 procedure Scan_String (B : out Natural; E : out Natural);
113 -- Skips white space if any, then requires that a double quote
114 -- or percent be present (start of string). Raises error if
115 -- neither of these two characters is found. Otherwise scans
116 -- out the string, and returns with P pointing past the
117 -- closing quote and S (B .. E) contains the characters of the
118 -- string (including the enclosing quotes, with internal quotes
119 -- still doubled). Raises Error if the string is malformed.
122 -- Skips P past any white space characters (end of line
123 -- characters, spaces, comments, horizontal tab characters).
129 function Acquire_String (B : Natural; E : Natural) return String is
130 Str : String (1 .. E - B - 1);
131 Q : constant Character := S (B);
142 if S (Ptr) = Q and then S (Ptr + 1) = Q then
152 -----------------------
153 -- Acquire_Unit_Name --
154 -----------------------
156 function Acquire_Unit_Name return String is
163 while not At_EOF loop
164 exit when S (P) not in '0' .. '9'
165 and then S (P) /= '.'
166 and then S (P) /= '_'
167 and then not (S (P) = '[' and then S (P + 1) = '"')
168 and then not (S (P) = '"' and then S (P - 1) = '[')
169 and then not (S (P) = '"' and then S (P + 1) = ']')
170 and then not (S (P) = ']' and then S (P - 1) = '"')
171 and then S (P) < 'A';
176 Error ("null unit name");
179 return S (B .. P - 1);
180 end Acquire_Unit_Name;
186 function At_EOF return Boolean is
191 ---------------------
192 -- Check_File_Type --
193 ---------------------
195 function Check_File_Type return Character is
197 if Check_Token ("spec_file_name") then
199 elsif Check_Token ("body_file_name") then
201 elsif Check_Token ("subunit_file_name") then
208 ----------------------
209 -- Check_Not_At_EOF --
210 ----------------------
212 procedure Check_Not_At_EOF is
217 Error ("unexpected end of file");
221 end Check_Not_At_EOF;
227 function Check_Token (T : String) return Boolean is
235 for K in T'Range loop
243 if C in 'A' .. 'Z' then
244 C := Character'Val (Character'Pos (C) +
245 (Character'Pos ('a') - Character'Pos ('A')));
263 or else C in 'a' .. 'z'
264 or else C in 'A' .. 'Z'
265 or else C > Character'Val (127)
279 procedure Error (Err : String) is
283 M : String (1 .. 80);
284 -- Buffer used to build resulting error msg
287 -- Pointer to last set location in M
289 procedure Add_Nat (N : Natural);
290 -- Add chars of integer to error msg buffer
292 procedure Add_Nat (N : Natural) is
299 M (LM) := Character'Val (N mod 10 + Character'Pos ('0'));
302 -- Start of processing for Error
305 M (1 .. 9) := "gnat.adc:";
311 -- Determine column number
313 for X in Start_Of_Line .. P loop
317 C := (C + 7) / 8 * 8;
327 M (LM + 1 .. LM + Err'Length) := Err;
328 LM := LM + Err'Length;
330 Raise_Exception (Syntax_Error_In_GNAT_ADC'Identity, M (1 .. LM));
337 procedure Require_Token (T : String) is
344 for J in T'Range loop
346 if At_EOF or else S (P) /= T (J) then
348 S : String (1 .. T'Length + 10);
351 S (1 .. 9) := "missing """;
352 S (10 .. T'Length + 9) := T;
353 S (T'Length + 10) := '"';
364 ----------------------
365 -- Scan_SFN_Pragmas --
366 ----------------------
368 procedure Scan_SFN_Pragmas
370 SFN_Ptr : Set_File_Name_Ptr;
371 SFNP_Ptr : Set_File_Name_Pattern_Ptr)
379 S := Source'Unrestricted_Access;
383 -- Loop through pragmas in file
385 Main_Scan_Loop : loop
387 exit Main_Scan_Loop when At_EOF;
389 -- Error if something other than pragma
391 if not Check_Token ("pragma") then
392 Error ("non pragma encountered");
395 -- Source_File_Name pragma case
397 if Check_Token ("source_file_name") then
400 Typ := Check_File_Type;
402 -- First format, with unit name first
405 if Check_Token ("unit_name") then
406 Require_Token ("=>");
410 U : constant String := Acquire_Unit_Name;
414 Typ := Check_File_Type;
416 if Typ /= 's' and then Typ /= 'b' then
417 Error ("bad pragma");
420 Require_Token ("=>");
424 F : constant String := Acquire_String (B, E);
429 SFN_Ptr.all (Typ, U, F);
433 -- Second format with pattern string
436 Require_Token ("=>");
440 Pat : constant String := Acquire_String (B, E);
444 -- Check exactly one asterisk
446 for J in Pat'Range loop
447 if Pat (J) = '*' then
453 Error ("** not allowed");
460 -- Loop to scan out Casing or Dot_Replacement parameters
464 exit when S (P) = ')';
467 if Check_Token ("casing") then
468 Require_Token ("=>");
471 Error ("duplicate casing argument");
472 elsif Check_Token ("lowercase") then
474 elsif Check_Token ("uppercase") then
476 elsif Check_Token ("mixedcase") then
479 Error ("invalid casing argument");
482 elsif Check_Token ("dot_replacement") then
483 Require_Token ("=>");
486 Error ("duplicate dot_replacement");
492 Error ("invalid argument");
504 SFNP_Ptr.all (Pat, Typ, ".", Cas);
508 Dot : constant String := Acquire_String (B, E);
511 SFNP_Ptr.all (Pat, Typ, Dot, Cas);
517 -- Some other pragma, scan to semicolon at end of pragma
521 exit Main_Scan_Loop when At_EOF;
522 exit Skip_Loop when S (P) = ';';
524 if S (P) = '"' or else S (P) = '%' then
531 -- We successfuly skipped to semicolon, so skip past it
535 end loop Main_Scan_Loop;
539 Cursor := P - S'First + 1;
541 end Scan_SFN_Pragmas;
547 procedure Scan_String (B : out Natural; E : out Natural) is
555 elsif S (P) = '%' then
558 Error ("bad string");
562 -- Scan out the string, B points to first char
568 if At_EOF or else S (P) = LF or else S (P) = CR then
569 Error ("missing string quote");
571 elsif S (P) = HT then
572 Error ("tab character in string");
574 elsif S (P) /= Q then
582 -- Check for doubled quote
584 if not At_EOF and then S (P) = Q then
587 -- Otherwise this is the terminating quote
603 WS_Scan : while not At_EOF loop
606 -- End of physical line
609 Line_Num := Line_Num + 1;
613 and then (S (P) = CR or else S (P) = LF)
615 Line_Num := Line_Num + 1;
621 -- All other cases of white space characters
623 when ' ' | FF | VT | HT =>
632 Error ("bad comment");
634 elsif S (P) = '-' then
637 while not At_EOF loop
639 when CR | LF | FF | VT =>