131
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1 /* Find near-matches for macros.
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2 Copyright (C) 2016-2018 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #include "config.h"
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21 #include "system.h"
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22 #include "coretypes.h"
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23 #include "tm.h"
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24 #include "tree.h"
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25 #include "cpplib.h"
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26 #include "spellcheck-tree.h"
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27 #include "c-family/c-spellcheck.h"
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28 #include "selftest.h"
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29
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30 /* Return true iff STR begin with an underscore and either an uppercase
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31 letter or another underscore, and is thus, for C and C++, reserved for
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32 use by the implementation. */
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33
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34 bool
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35 name_reserved_for_implementation_p (const char *str)
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36 {
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37 if (str[0] != '_')
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38 return false;
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39 return (str[1] == '_' || ISUPPER(str[1]));
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40 }
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41
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42 /* Return true iff HASHNODE is a macro that should be offered as a
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43 suggestion for a misspelling. */
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44
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45 static bool
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46 should_suggest_as_macro_p (cpp_hashnode *hashnode)
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47 {
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48 if (!cpp_macro_p (hashnode))
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49 return false;
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50
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51 /* Don't suggest names reserved for the implementation, but do
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52 suggest the builtin macros such as __FILE__, __LINE__ etc. */
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53 if (cpp_user_macro_p (hashnode)
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54 && name_reserved_for_implementation_p ((const char *)hashnode->ident.str))
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55 return false;
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56
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57 return true;
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58 }
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59
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60 /* A callback for cpp_forall_identifiers, for use by best_macro_match's ctor.
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61 Process HASHNODE and update the best_macro_match instance pointed to be
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62 USER_DATA. */
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63
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64 static int
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65 find_closest_macro_cpp_cb (cpp_reader *, cpp_hashnode *hashnode,
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66 void *user_data)
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67 {
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68 if (!should_suggest_as_macro_p (hashnode))
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69 return 1;
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70
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71 best_macro_match *bmm = (best_macro_match *)user_data;
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72 bmm->consider (hashnode);
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73
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74 /* Keep iterating. */
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75 return 1;
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76 }
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77
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78 /* Constructor for best_macro_match.
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79 Use find_closest_macro_cpp_cb to find the closest matching macro to
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80 NAME within distance < best_distance_so_far. */
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81
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82 best_macro_match::best_macro_match (tree goal,
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83 edit_distance_t best_distance_so_far,
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84 cpp_reader *reader)
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85 : best_match <goal_t, candidate_t> (goal, best_distance_so_far)
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86 {
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87 cpp_forall_identifiers (reader, find_closest_macro_cpp_cb, this);
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88 }
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89
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90 #if CHECKING_P
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91
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92 namespace selftest {
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93
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94 /* Selftests. */
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95
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96 /* Verify that name_reserved_for_implementation_p is sane. */
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97
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98 static void
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99 test_name_reserved_for_implementation_p ()
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100 {
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101 ASSERT_FALSE (name_reserved_for_implementation_p (""));
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102 ASSERT_FALSE (name_reserved_for_implementation_p ("foo"));
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103 ASSERT_FALSE (name_reserved_for_implementation_p ("_"));
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104 ASSERT_FALSE (name_reserved_for_implementation_p ("_foo"));
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105 ASSERT_FALSE (name_reserved_for_implementation_p ("_42"));
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106 ASSERT_TRUE (name_reserved_for_implementation_p ("_Foo"));
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107 ASSERT_TRUE (name_reserved_for_implementation_p ("__"));
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108 ASSERT_TRUE (name_reserved_for_implementation_p ("__foo"));
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109 }
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110
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111 /* Run all of the selftests within this file. */
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112
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113 void
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114 c_spellcheck_cc_tests ()
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115 {
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116 test_name_reserved_for_implementation_p ();
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117 }
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118
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119 } // namespace selftest
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120
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121 #endif /* #if CHECKING_P */
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