gcc/opt-suggestions.h

   1 /* Provide suggestions to handle misspelled options, and implement the
   2    --complete option for auto-completing options from a prefix.
   3    Copyright (C) 2016-2018 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef GCC_OPT_PROPOSER_H
  22 #define GCC_OPT_PROPOSER_H
  23
  24 /* Option proposer is class used by driver in order to provide hints
  25    for wrong options provided.  And it's used by --complete option that's
  26    intended to be invoked by BASH in order to provide better option
  27    completion support.  */
  28
  29 class option_proposer
  30 {
  31 public:
  32   /* Default constructor.  */
  33   option_proposer (): m_option_suggestions (NULL)
  34   {}
  35
  36   /* Default destructor.  */
  37   ~option_proposer ();
  38
  39   /* Helper function for driver::handle_unrecognized_options.
  40
  41      Given an unrecognized option BAD_OPT (without the leading dash),
  42      locate the closest reasonable matching option (again, without the
  43      leading dash), or NULL.
  44
  45      The returned string is owned by the option_proposer instance.  */
  46   const char *suggest_option (const char *bad_opt);
  47
  48   /* Print on stdout a list of valid options that begin with OPTION_PREFIX,
  49      one per line, suitable for use by Bash completion.
  50
  51      Implementation of the "-completion=" option.  */
  52   void suggest_completion (const char *option_prefix);
  53
  54   /* Populate RESULTS with valid completions of options that begin
  55      with OPTION_PREFIX.  */
  56   void get_completions (const char *option_prefix, auto_string_vec &results);
  57
  58 private:
  59   /* Helper function for option_proposer::suggest_option.  Populate
  60      m_option_suggestions with candidate strings for misspelled options.
  61      The strings will be freed by the option_proposer's dtor.
  62      PREFIX is used for bash completion suggestions, otherwise
  63      it's set to NULL.  */
  64   void build_option_suggestions (const char *prefix);
  65
  66   /* Find parameter completions for --param format with SEPARATOR.
  67      Again, save the completions into results.  */
  68   void find_param_completions (const char separator, const char *param_prefix,
  69                                auto_string_vec &results);
  70
  71 private:
  72   /* Cache with all suggestions.  */
  73   auto_string_vec *m_option_suggestions;
  74 };
  75
  76 #endif  /* GCC_OPT_PROPOSER_H */