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Diffstat (limited to 'gcc-4.9/gcc/ada/scn.ads')
| -rw-r--r-- | gcc-4.9/gcc/ada/scn.ads | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/ada/scn.ads b/gcc-4.9/gcc/ada/scn.ads new file mode 100644 index 000000000..ea7b22be9 --- /dev/null +++ b/gcc-4.9/gcc/ada/scn.ads @@ -0,0 +1,83 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT COMPILER COMPONENTS -- +-- -- +-- S C N -- +-- -- +-- S p e c -- +-- -- +-- Copyright (C) 1992-2010, 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 3, 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 COPYING3. If not, go to -- +-- http://www.gnu.org/licenses for a complete copy of the license. -- +-- -- +-- GNAT was originally developed by the GNAT team at New York University. -- +-- Extensive contributions were provided by Ada Core Technologies Inc. -- +-- -- +------------------------------------------------------------------------------ + +-- This package contains the lexical analyzer routines. This is used by the +-- compiler for scanning Ada source files. + +with Casing; use Casing; +with Errout; use Errout; +with Scng; +with Style; use Style; +with Types; use Types; + +package Scn is + + procedure Initialize_Scanner + (Unit : Unit_Number_Type; + Index : Source_File_Index); + -- Initialize lexical scanner for scanning a new file. The caller has + -- completed the construction of the Units.Table entry for the specified + -- Unit and Index references the corresponding source file. A special + -- case is when Unit = No_Unit_Number, and Index corresponds to the + -- source index for reading the configuration pragma file. + + function Determine_Token_Casing return Casing_Type; + -- Determines the casing style of the current token, which is + -- either a keyword or an identifier. See also package Casing. + + procedure Post_Scan; + -- Create nodes for tokens: Char_Literal, Identifier, Real_Literal, + -- Integer_Literal, String_Literal and Operator_Symbol. + + procedure Scan_Reserved_Identifier (Force_Msg : Boolean); + -- This procedure is called to convert the current token, which the caller + -- has checked is for a reserved word, to an equivalent identifier. This is + -- of course only used in error situations where the parser can detect that + -- a reserved word is being used as an identifier. An appropriate error + -- message, pointing to the token, is also issued if either this is the + -- first occurrence of misuse of this identifier, or if Force_Msg is True. + + ------------- + -- Scanner -- + ------------- + + -- The scanner used by the compiler is an instantiation of the + -- generic package Scng with routines appropriate to the compiler + + package Scanner is new Scng + (Post_Scan => Post_Scan, + Error_Msg => Error_Msg, + Error_Msg_S => Error_Msg_S, + Error_Msg_SC => Error_Msg_SC, + Error_Msg_SP => Error_Msg_SP, + Style => Style.Style_Inst); + + procedure Scan renames Scanner.Scan; + -- Scan scans out the next token, and advances the scan state accordingly + -- (see package Scans for details). If the scan encounters an illegal + -- token, then an error message is issued pointing to the bad character, + -- and Scan returns a reasonable substitute token of some kind. + +end Scn; |