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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- S C N --
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6 -- --
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7 -- S p e c --
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8 -- --
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145
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9 -- Copyright (C) 1992-2019, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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17 -- for more details. You should have received a copy of the GNU General --
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18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
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19 -- http://www.gnu.org/licenses for a complete copy of the license. --
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20 -- --
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21 -- GNAT was originally developed by the GNAT team at New York University. --
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22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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23 -- --
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24 ------------------------------------------------------------------------------
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25
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26 -- This package contains the lexical analyzer routines. This is used by the
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27 -- compiler for scanning Ada source files.
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28
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29 with Casing; use Casing;
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30 with Errout; use Errout;
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31 with Scng;
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32 with Style; -- use Style;
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33 with Types; use Types;
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34
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35 package Scn is
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36
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37 procedure Initialize_Scanner
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38 (Unit : Unit_Number_Type;
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39 Index : Source_File_Index);
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40 -- Initialize lexical scanner for scanning a new file. The caller has
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41 -- completed the construction of the Units.Table entry for the specified
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42 -- Unit and Index references the corresponding source file. A special case
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43 -- is when Unit = No_Unit, and Index corresponds to the source index for
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44 -- reading the configuration pragma file.
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45
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46 function Determine_Token_Casing return Casing_Type;
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47 -- Determines the casing style of the current token, which is either a
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48 -- keyword or an identifier. See also package Casing.
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49
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50 procedure Post_Scan;
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51 -- Create nodes for tokens: Char_Literal, Identifier, Real_Literal,
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52 -- Integer_Literal, String_Literal and Operator_Symbol.
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53
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54 procedure Scan_Reserved_Identifier (Force_Msg : Boolean);
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55 -- This procedure is called to convert the current token, which the caller
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56 -- has checked is for a reserved word, to an equivalent identifier. This is
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57 -- of course only used in error situations where the parser can detect that
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58 -- a reserved word is being used as an identifier. An appropriate error
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59 -- message, pointing to the token, is also issued if either this is the
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60 -- first occurrence of misuse of this identifier, or if Force_Msg is True.
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61
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62 -------------
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63 -- Scanner --
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64 -------------
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65
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66 -- The scanner used by the compiler is an instantiation of the
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67 -- generic package Scng with routines appropriate to the compiler
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68
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69 package Scanner is new Scng
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70 (Post_Scan => Post_Scan,
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71 Error_Msg => Error_Msg,
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72 Error_Msg_S => Error_Msg_S,
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73 Error_Msg_SC => Error_Msg_SC,
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74 Error_Msg_SP => Error_Msg_SP,
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75 Style => Style.Style_Inst);
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76
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77 procedure Scan renames Scanner.Scan;
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78 -- Scan scans out the next token, and advances the scan state accordingly
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79 -- (see package Scans for details). If the scan encounters an illegal
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80 -- token, then an error message is issued pointing to the bad character,
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81 -- and Scan returns a reasonable substitute token of some kind.
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82
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83 end Scn;
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