gcc/ada/errutil.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                              E R R U T I L                               --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2002-2007, 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 routines to output error messages and the
  27 --  corresponding instantiation of Styleg, suitable to instantiate Scng.
  28
  29 --  It is not dependent on the GNAT tree packages (Atree, Sinfo, ...)
  30
  31 --  It uses the same global variables as Errout, located in package
  32 --  Err_Vars. Like Errout, it also uses the common variables and routines
  33 --  in package Erroutc.
  34
  35 --  This package is used by the preprocessor (gprep.adb) and the project
  36 --  manager (prj-err.ads).
  37
  38 with Styleg;
  39 with Types; use Types;
  40
  41 package Errutil is
  42
  43    ---------------------------------------------------------
  44    -- Error Message Text and Message Insertion Characters --
  45    ---------------------------------------------------------
  46
  47    --  Error message text strings are composed of lower case letters, digits
  48    --  and the special characters space, comma, period, colon and semicolon,
  49    --  apostrophe and parentheses. Special insertion characters can also
  50    --  appear which cause the error message circuit to modify the given
  51    --  string. For a full list of these, see the spec of errout.
  52
  53    -----------------------------------------------------
  54    -- Format of Messages and Manual Quotation Control --
  55    -----------------------------------------------------
  56
  57    --  Messages are generally all in lower case, except for inserted names
  58    --  and appear in one of the following two forms:
  59
  60    --    error: text
  61    --    warning: text
  62
  63    --  The prefixes error and warning are supplied automatically (depending
  64    --  on the use of the ? insertion character), and the call to the error
  65    --  message routine supplies the text. The "error: " prefix is omitted
  66    --  in brief error message formats.
  67
  68    --  Reserved keywords in the message are in the default keyword case
  69    --  (determined from the given source program), surrounded by quotation
  70    --  marks. This is achieved by spelling the reserved word in upper case
  71    --  letters, which is recognized as a request for insertion of quotation
  72    --  marks by the error text processor. Thus for example:
  73
  74    --    Error_Msg_AP ("IS expected");
  75
  76    --  would result in the output of one of the following:
  77
  78    --    error: "is" expected
  79    --    error: "IS" expected
  80    --    error: "Is" expected
  81
  82    --  the choice between these being made by looking at the casing convention
  83    --  used for keywords (actually the first compilation unit keyword) in the
  84    --  source file.
  85
  86    --  In the case of names, the default mode for the error text processor
  87    --  is to surround the name by quotation marks automatically. The case
  88    --  used for the identifier names is taken from the source program where
  89    --  possible, and otherwise is the default casing convention taken from
  90    --  the source file usage.
  91
  92    --  In some cases, better control over the placement of quote marks is
  93    --  required. This is achieved using manual quotation mode. In this mode,
  94    --  one or more insertion sequences is surrounded by backquote characters.
  95    --  The backquote characters are output as double quote marks, and normal
  96    --  automatic insertion of quotes is suppressed between the double quotes.
  97    --  For example:
  98
  99    --    Error_Msg_AP ("`END &;` expected");
 100
 101    --  generates a message like
 102
 103    --    error: "end Open_Scope;" expected
 104
 105    --  where the node specifying the name Open_Scope has been stored in
 106    --  Error_Msg_Node_1 prior to the call. The great majority of error
 107    --  messages operates in normal quotation mode.
 108
 109    --  Note: the normal automatic insertion of spaces before insertion
 110    --  sequences (such as those that come from & and %) is suppressed in
 111    --  manual quotation mode, so blanks, if needed as in the above example,
 112    --  must be explicitly present.
 113
 114    ------------------------------
 115    -- Error Output Subprograms --
 116    ------------------------------
 117
 118    procedure Initialize;
 119    --  Initializes for output of error messages. Must be called for each
 120    --  file before using any of the other routines in the package.
 121
 122    procedure Finalize (Source_Type : String := "project");
 123    --  Finalize processing of error messages for one file and output message
 124    --  indicating the number of detected errors.
 125    --  Source_Type is used in verbose mode to indicate the type of the source
 126    --  being parsed (project file, definition file or input file for the
 127    --  preprocessor).
 128
 129    procedure Error_Msg (Msg : String; Flag_Location : Source_Ptr);
 130    --  Output a message at specified location
 131
 132    procedure Error_Msg_S (Msg : String);
 133    --  Output a message at current scan pointer location
 134
 135    procedure Error_Msg_SC (Msg : String);
 136    --  Output a message at the start of the current token, unless we are at
 137    --  the end of file, in which case we always output the message after the
 138    --  last real token in the file.
 139
 140    procedure Error_Msg_SP (Msg : String);
 141    --  Output a message at the start of the previous token
 142
 143    procedure Set_Ignore_Errors (To : Boolean);
 144    --  Indicate, when To = True, that all reported errors should
 145    --  be ignored. By default reported errors are not ignored.
 146
 147    package Style is new Styleg
 148      (Error_Msg    => Error_Msg,
 149       Error_Msg_S  => Error_Msg_S,
 150       Error_Msg_SC => Error_Msg_SC,
 151       Error_Msg_SP => Error_Msg_SP);
 152    --  Instantiation of the generic style package, suitable for an
 153    --  instantiation of Scng.
 154
 155 end Errutil;