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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 F N _ S C A N --
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6 -- --
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7 -- S p e c --
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8 -- --
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9 -- Copyright (C) 2000-2017, Free Software Foundation, Inc. --
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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 provides a stand alone capability for scanning a gnat.adc
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27 -- file for Source_File_Name pragmas. This is for use in tools other than
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28 -- the compiler, which want to scan source file name pragmas without the
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29 -- overhead of the full compiler scanner and parser.
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30
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31 -- Note that neither the package spec, nor the package body, of this
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32 -- unit contains any with statements at all. This is a completely
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33 -- independent package, suitable for incorporation into tools that do
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34 -- not access any other units in the GNAT compiler or tools sources.
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35
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36 -- This package is NOT task safe, so multiple tasks that may call the
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37 -- Scan_SFN_Pragmas procedure at the same time are responsible for
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38 -- avoiding such multiple calls by appropriate synchronization.
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39
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40 package SFN_Scan is
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41
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42 -- The call to SFN_Scan passes pointers to two procedures that are
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43 -- used to store the results of scanning any Source_File_Name pragmas
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44 -- that are encountered. The following access types define the form
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45 -- of these procedures:
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46
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47 type Set_File_Name_Ptr is access
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48 procedure
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49 (Typ : Character;
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50 U : String;
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51 F : String;
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52 Index : Natural);
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53 -- The procedure with this profile is called when a Source_File_Name
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54 -- pragma of the form having a unit name parameter. Typ is 'b' for
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55 -- a body file name, and 's' for a spec file name. U is a string that
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56 -- contains the unit name, exactly as it appeared in the source file,
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57 -- and F is the file taken from the second parameter. Index is taken
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58 -- from the third parameter, or is set to zero if no third parameter.
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59
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60 type Set_File_Name_Pattern_Ptr is access
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61 procedure (Pat : String; Typ : Character; Dot : String; Cas : Character);
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62 -- This is called to process a Source_File_Name pragma whose first
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63 -- argument is a file pattern. Pat is this pattern string, which
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64 -- contains an asterisk to correspond to the unit. Typ is one of
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65 -- ('b'/'s'/'u') for body/spec/subunit, Dot is the separator string
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66 -- for child/subunit names (default is "."), and Cas is one of
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67 -- ('l'/'u'/'m') indicating the required case for the file name.
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68 -- The default setting for Cas is 'l' if no parameter is present.
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69
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70 Cursor : Natural;
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71 -- Used to record the cursor value if a syntax error is found
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72
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73 Syntax_Error_In_GNAT_ADC : exception;
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74 -- Exception raised if a syntax error is found
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75
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76 procedure Scan_SFN_Pragmas
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77 (Source : String;
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78 SFN_Ptr : Set_File_Name_Ptr;
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79 SFNP_Ptr : Set_File_Name_Pattern_Ptr);
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80 -- This is the procedure called to scan a gnat.adc file. The Source
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81 -- parameter contains the full text of the file, with normal line end
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82 -- characters, in the format normally read by the compiler. The two
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83 -- parameters SFN_Ptr and SFNP_Ptr point to procedures that will be
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84 -- called to register Source_File_Name pragmas as they are found.
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85 --
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86 -- If a syntax error is found, then Syntax_Error_In_GNAT_ADC is raised,
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87 -- and the location SFN_Scan.Cursor contains the approximate index of
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88 -- the error in the source string.
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89 --
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90 -- The scan assumes that it is dealing with a valid gnat.adc file,
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91 -- that includes only pragmas and comments. It does not do a full
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92 -- syntax correctness scan by any means, but if it does find anything
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93 -- that it can tell is wrong it will immediately raise the exception
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94 -- to indicate the approximate location of the error.
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95
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96 end SFN_Scan;
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