utils/unittest/googlemock/src/gmock.cc

   1 // Copyright 2008, Google Inc.
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   3 //
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   5 // modification, are permitted provided that the following conditions are
   6 // met:
   7 //
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  10 //     * Redistributions in binary form must reproduce the above
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  15 // contributors may be used to endorse or promote products derived from
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  17 //
  18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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  28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29 //
  30 // Author: wan@google.com (Zhanyong Wan)
  31
  32 #include "gmock/gmock.h"
  33 #include "gmock/internal/gmock-port.h"
  34
  35 namespace testing {
  36
  37 // TODO(wan@google.com): support using environment variables to
  38 // control the flag values, like what Google Test does.
  39
  40 GMOCK_DEFINE_bool_(catch_leaked_mocks, true,
  41                    "true iff Google Mock should report leaked mock objects "
  42                    "as failures.");
  43
  44 GMOCK_DEFINE_string_(verbose, internal::kWarningVerbosity,
  45                      "Controls how verbose Google Mock's output is."
  46                      "  Valid values:\n"
  47                      "  info    - prints all messages.\n"
  48                      "  warning - prints warnings and errors.\n"
  49                      "  error   - prints errors only.");
  50
  51 namespace internal {
  52
  53 // Parses a string as a command line flag.  The string should have the
  54 // format "--gmock_flag=value".  When def_optional is true, the
  55 // "=value" part can be omitted.
  56 //
  57 // Returns the value of the flag, or NULL if the parsing failed.
  58 static const char* ParseGoogleMockFlagValue(const char* str,
  59                                             const char* flag,
  60                                             bool def_optional) {
  61   // str and flag must not be NULL.
  62   if (str == NULL || flag == NULL) return NULL;
  63
  64   // The flag must start with "--gmock_".
  65   const std::string flag_str = std::string("--gmock_") + flag;
  66   const size_t flag_len = flag_str.length();
  67   if (strncmp(str, flag_str.c_str(), flag_len) != 0) return NULL;
  68
  69   // Skips the flag name.
  70   const char* flag_end = str + flag_len;
  71
  72   // When def_optional is true, it's OK to not have a "=value" part.
  73   if (def_optional && (flag_end[0] == '\0')) {
  74     return flag_end;
  75   }
  76
  77   // If def_optional is true and there are more characters after the
  78   // flag name, or if def_optional is false, there must be a '=' after
  79   // the flag name.
  80   if (flag_end[0] != '=') return NULL;
  81
  82   // Returns the string after "=".
  83   return flag_end + 1;
  84 }
  85
  86 // Parses a string for a Google Mock bool flag, in the form of
  87 // "--gmock_flag=value".
  88 //
  89 // On success, stores the value of the flag in *value, and returns
  90 // true.  On failure, returns false without changing *value.
  91 static bool ParseGoogleMockBoolFlag(const char* str, const char* flag,
  92                                     bool* value) {
  93   // Gets the value of the flag as a string.
  94   const char* const value_str = ParseGoogleMockFlagValue(str, flag, true);
  95
  96   // Aborts if the parsing failed.
  97   if (value_str == NULL) return false;
  98
  99   // Converts the string value to a bool.
 100   *value = !(*value_str == '0' || *value_str == 'f' || *value_str == 'F');
 101   return true;
 102 }
 103
 104 // Parses a string for a Google Mock string flag, in the form of
 105 // "--gmock_flag=value".
 106 //
 107 // On success, stores the value of the flag in *value, and returns
 108 // true.  On failure, returns false without changing *value.
 109 template <typename String>
 110 static bool ParseGoogleMockStringFlag(const char* str, const char* flag,
 111                                       String* value) {
 112   // Gets the value of the flag as a string.
 113   const char* const value_str = ParseGoogleMockFlagValue(str, flag, false);
 114
 115   // Aborts if the parsing failed.
 116   if (value_str == NULL) return false;
 117
 118   // Sets *value to the value of the flag.
 119   *value = value_str;
 120   return true;
 121 }
 122
 123 // The internal implementation of InitGoogleMock().
 124 //
 125 // The type parameter CharType can be instantiated to either char or
 126 // wchar_t.
 127 template <typename CharType>
 128 void InitGoogleMockImpl(int* argc, CharType** argv) {
 129   // Makes sure Google Test is initialized.  InitGoogleTest() is
 130   // idempotent, so it's fine if the user has already called it.
 131   InitGoogleTest(argc, argv);
 132   if (*argc <= 0) return;
 133
 134   for (int i = 1; i != *argc; i++) {
 135     const std::string arg_string = StreamableToString(argv[i]);
 136     const char* const arg = arg_string.c_str();
 137
 138     // Do we see a Google Mock flag?
 139     if (ParseGoogleMockBoolFlag(arg, "catch_leaked_mocks",
 140                                 &GMOCK_FLAG(catch_leaked_mocks)) ||
 141         ParseGoogleMockStringFlag(arg, "verbose", &GMOCK_FLAG(verbose))) {
 142       // Yes.  Shift the remainder of the argv list left by one.  Note
 143       // that argv has (*argc + 1) elements, the last one always being
 144       // NULL.  The following loop moves the trailing NULL element as
 145       // well.
 146       for (int j = i; j != *argc; j++) {
 147         argv[j] = argv[j + 1];
 148       }
 149
 150       // Decrements the argument count.
 151       (*argc)--;
 152
 153       // We also need to decrement the iterator as we just removed
 154       // an element.
 155       i--;
 156     }
 157   }
 158 }
 159
 160 }  // namespace internal
 161
 162 // Initializes Google Mock.  This must be called before running the
 163 // tests.  In particular, it parses a command line for the flags that
 164 // Google Mock recognizes.  Whenever a Google Mock flag is seen, it is
 165 // removed from argv, and *argc is decremented.
 166 //
 167 // No value is returned.  Instead, the Google Mock flag variables are
 168 // updated.
 169 //
 170 // Since Google Test is needed for Google Mock to work, this function
 171 // also initializes Google Test and parses its flags, if that hasn't
 172 // been done.
 173 GTEST_API_ void InitGoogleMock(int* argc, char** argv) {
 174   internal::InitGoogleMockImpl(argc, argv);
 175 }
 176
 177 // This overloaded version can be used in Windows programs compiled in
 178 // UNICODE mode.
 179 GTEST_API_ void InitGoogleMock(int* argc, wchar_t** argv) {
 180   internal::InitGoogleMockImpl(argc, argv);
 181 }
 182
 183 }  // namespace testing