git://gcc.gnu.org / gcc.git / blame
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1 | ------------------------------------------------------------------------------ |
| 2 | -- -- | |
| 3 | -- GNAT COMPILER COMPONENTS -- | |
| 4 | -- -- | |
| 5 | -- S C N -- | |
| 6 | -- -- | |
| 7 | -- S p e c -- | |
| 8 | -- -- | |
| 996ae0b0 RK |
9 | -- Copyright (C) 1992-2000 Free Software Foundation, Inc. -- |
| 10 | -- -- | |
| 11 | -- GNAT is free software; you can redistribute it and/or modify it under -- | |
| 12 | -- terms of the GNU General Public License as published by the Free Soft- -- | |
| 13 | -- ware Foundation; either version 2, or (at your option) any later ver- -- | |
| 14 | -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- | |
| 15 | -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- | |
| 16 | -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- | |
| 17 | -- for more details. You should have received a copy of the GNU General -- | |
| 18 | -- Public License distributed with GNAT; see file COPYING. If not, write -- | |
| 19 | -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- | |
| 20 | -- MA 02111-1307, USA. -- | |
| 21 | -- -- | |
| 22 | -- GNAT was originally developed by the GNAT team at New York University. -- | |
| 71ff80dc | 23 | -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| 996ae0b0 RK |
24 | -- -- |
| 25 | ------------------------------------------------------------------------------ | |
| 26 | ||
| 27 | -- This package contains the lexical analyzer routines. This is used both | |
| 28 | -- for scanning Ada source files and also for scanning Ada project files. | |
| 29 | ||
| 30 | with Casing; use Casing; | |
| 31 | with Types; use Types; | |
| 32 | ||
| 33 | package Scn is | |
| 34 | ||
| 35 | procedure Initialize_Scanner | |
| 36 | (Unit : Unit_Number_Type; | |
| 37 | Index : Source_File_Index); | |
| 38 | -- Initialize lexical scanner for scanning a new file. The caller has | |
| 39 | -- completed the construction of the Units.Table entry for the specified | |
| 40 | -- Unit and Index references the corresponding source file. A special | |
| 41 | -- case is when Unit = No_Unit_Number, and Index corresponds to the | |
| 42 | -- source index for reading the configuration pragma file. | |
| 43 | ||
| 44 | procedure Scan; | |
| 45 | -- Scan scans out the next token, and advances the scan state accordingly | |
| 46 | -- (see package Scan_State for details). If the scan encounters an illegal | |
| 47 | -- token, then an error message is issued pointing to the bad character, | |
| 48 | -- and Scan returns a reasonable substitute token of some kind. | |
| 49 | ||
| 50 | function Scan_First_Char return Source_Ptr; | |
| 51 | -- This routine returns the position in Source of the first non-blank | |
| 52 | -- character on the current line, used for certain error recovery actions. | |
| 53 | ||
| 54 | procedure Scan_Reserved_Identifier (Force_Msg : Boolean); | |
| 55 | -- This procedure is called to convert the current token, which the caller | |
| 56 | -- has checked is for a reserved word, to an equivalent identifier. This is | |
| 57 | -- of course only used in error situations where the parser can detect that | |
| 58 | -- a reserved word is being used as an identifier. An appropriate error | |
| 59 | -- message, pointing to the token, is also issued if either this is the | |
| 60 | -- first occurrence of misuse of this identifier, or if Force_Msg is True. | |
| 61 | ||
| 62 | function Determine_Token_Casing return Casing_Type; | |
| 63 | pragma Inline (Determine_Token_Casing); | |
| 64 | -- Determines the casing style of the current token, which is | |
| 65 | -- either a keyword or an identifier. See also package Casing. | |
| 66 | ||
| 67 | end Scn; |