Mercurial > hg > CbC > CbC_gcc
comparison gcc/ada/scn.ads @ 111:04ced10e8804
gcc 7
| author | kono |
|---|---|
| date | Fri, 27 Oct 2017 22:46:09 +0900 |
| parents | |
| children | 84e7813d76e9 |
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| 68:561a7518be6b | 111:04ced10e8804 |
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| 1 ------------------------------------------------------------------------------ | |
| 2 -- -- | |
| 3 -- GNAT COMPILER COMPONENTS -- | |
| 4 -- -- | |
| 5 -- S C N -- | |
| 6 -- -- | |
| 7 -- S p e c -- | |
| 8 -- -- | |
| 9 -- Copyright (C) 1992-2017, 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 3, 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 COPYING3. If not, go to -- | |
| 19 -- http://www.gnu.org/licenses for a complete copy of the license. -- | |
| 20 -- -- | |
| 21 -- GNAT was originally developed by the GNAT team at New York University. -- | |
| 22 -- Extensive contributions were provided by Ada Core Technologies Inc. -- | |
| 23 -- -- | |
| 24 ------------------------------------------------------------------------------ | |
| 25 | |
| 26 -- This package contains the lexical analyzer routines. This is used by the | |
| 27 -- compiler for scanning Ada source files. | |
| 28 | |
| 29 with Casing; use Casing; | |
| 30 with Errout; use Errout; | |
| 31 with Scng; | |
| 32 with Style; -- use Style; | |
| 33 with Types; use Types; | |
| 34 | |
| 35 package Scn is | |
| 36 | |
| 37 procedure Initialize_Scanner | |
| 38 (Unit : Unit_Number_Type; | |
| 39 Index : Source_File_Index); | |
| 40 -- Initialize lexical scanner for scanning a new file. The caller has | |
| 41 -- completed the construction of the Units.Table entry for the specified | |
| 42 -- Unit and Index references the corresponding source file. A special case | |
| 43 -- is when Unit = No_Unit, and Index corresponds to the source index for | |
| 44 -- reading the configuration pragma file. | |
| 45 | |
| 46 function Determine_Token_Casing return Casing_Type; | |
| 47 -- Determines the casing style of the current token, which is either a | |
| 48 -- keyword or an identifier. See also package Casing. | |
| 49 | |
| 50 procedure Post_Scan; | |
| 51 -- Create nodes for tokens: Char_Literal, Identifier, Real_Literal, | |
| 52 -- Integer_Literal, String_Literal and Operator_Symbol. | |
| 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 ------------- | |
| 63 -- Scanner -- | |
| 64 ------------- | |
| 65 | |
| 66 -- The scanner used by the compiler is an instantiation of the | |
| 67 -- generic package Scng with routines appropriate to the compiler | |
| 68 | |
| 69 package Scanner is new Scng | |
| 70 (Post_Scan => Post_Scan, | |
| 71 Error_Msg => Error_Msg, | |
| 72 Error_Msg_S => Error_Msg_S, | |
| 73 Error_Msg_SC => Error_Msg_SC, | |
| 74 Error_Msg_SP => Error_Msg_SP, | |
| 75 Style => Style.Style_Inst); | |
| 76 | |
| 77 procedure Scan renames Scanner.Scan; | |
| 78 -- Scan scans out the next token, and advances the scan state accordingly | |
| 79 -- (see package Scans for details). If the scan encounters an illegal | |
| 80 -- token, then an error message is issued pointing to the bad character, | |
| 81 -- and Scan returns a reasonable substitute token of some kind. | |
| 82 | |
| 83 end Scn; |