projects / thirdparty / 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 | -- -- | |
| 4b490c1e | 9 | -- Copyright (C) 1992-2020, Free Software Foundation, Inc. -- |
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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- -- | |
| b5c84c3c | 13 | -- ware Foundation; either version 3, or (at your option) any later ver- -- |
| 996ae0b0 RK |
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 -- | |
| b5c84c3c RD |
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. -- | |
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20 | -- -- |
| 21 | -- GNAT was originally developed by the GNAT team at New York University. -- | |
| 71ff80dc | 22 | -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
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23 | -- -- |
| 24 | ------------------------------------------------------------------------------ | |
| 25 | ||
| fbf5a39b AC |
26 | -- This package contains the lexical analyzer routines. This is used by the |
| 27 | -- compiler for scanning Ada source files. | |
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28 | |
| 29 | with Casing; use Casing; | |
| fbf5a39b AC |
30 | with Errout; use Errout; |
| 31 | with Scng; | |
| 851e9f19 | 32 | with Style; -- use Style; |
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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 | |
| 0f96fd14 BD |
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. | |
| 996ae0b0 | 45 | |
| fbf5a39b | 46 | function Determine_Token_Casing return Casing_Type; |
| 8f1fe1f8 AC |
47 | -- Determines the casing style of the current token, which is either a |
| 48 | -- keyword or an identifier. See also package Casing. | |
| 996ae0b0 | 49 | |
| fbf5a39b | 50 | procedure Post_Scan; |
| fbf5a39b AC |
51 | -- Create nodes for tokens: Char_Literal, Identifier, Real_Literal, |
| 52 | -- Integer_Literal, String_Literal and Operator_Symbol. | |
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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 | ||
| fbf5a39b AC |
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 | |
| c90b2058 AC |
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); | |
| fbf5a39b AC |
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. | |
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82 | |
| 83 | end Scn; |