contrib/libc++/src/regex.cpp

   1 //===-------------------------- regex.cpp ---------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is dual licensed under the MIT and the University of Illinois Open
   6 // Source Licenses. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "regex"
  11 #include "algorithm"
  12 #include "iterator"
  13
  14 _LIBCPP_BEGIN_NAMESPACE_STD
  15
  16 static
  17 const char*
  18 make_error_type_string(regex_constants::error_type ecode)
  19 {
  20     switch (ecode)
  21     {
  22     case regex_constants::error_collate:
  23         return "The expression contained an invalid collating element name.";
  24     case regex_constants::error_ctype:
  25         return "The expression contained an invalid character class name.";
  26     case regex_constants::error_escape:
  27         return "The expression contained an invalid escaped character, or a "
  28                "trailing escape.";
  29     case regex_constants::error_backref:
  30         return "The expression contained an invalid back reference.";
  31     case regex_constants::error_brack:
  32         return "The expression contained mismatched [ and ].";
  33     case regex_constants::error_paren:
  34         return "The expression contained mismatched ( and ).";
  35     case regex_constants::error_brace:
  36         return "The expression contained mismatched { and }.";
  37     case regex_constants::error_badbrace:
  38         return "The expression contained an invalid range in a {} expression.";
  39     case regex_constants::error_range:
  40         return "The expression contained an invalid character range, "
  41                "such as [b-a] in most encodings.";
  42     case regex_constants::error_space:
  43         return "There was insufficient memory to convert the expression into "
  44                "a finite state machine.";
  45     case regex_constants::error_badrepeat:
  46         return "One of *?+{ was not preceded by a valid regular expression.";
  47     case regex_constants::error_complexity:
  48         return "The complexity of an attempted match against a regular "
  49                "expression exceeded a pre-set level.";
  50     case regex_constants::error_stack:
  51         return "There was insufficient memory to determine whether the regular "
  52                "expression could match the specified character sequence.";
  53     case regex_constants::__re_err_grammar:
  54         return "An invalid regex grammar has been requested.";
  55     case regex_constants::__re_err_empty:
  56         return "An empty regex is not allowed in the POSIX grammar.";
  57     default:
  58         break;
  59     }
  60     return "Unknown error type";
  61 }
  62
  63 regex_error::regex_error(regex_constants::error_type ecode)
  64     : runtime_error(make_error_type_string(ecode)),
  65       __code_(ecode)
  66 {}
  67
  68 regex_error::~regex_error() throw() {}
  69
  70 namespace {
  71
  72 #pragma clang diagnostic push
  73 #pragma clang diagnostic ignored "-Wpadded"
  74
  75 struct collationnames
  76 {
  77     const char* elem_;
  78     char char_;
  79 };
  80
  81 #pragma clang diagnostic pop
  82
  83 const collationnames collatenames[] =
  84 {
  85     {"A", 0x41},
  86     {"B", 0x42},
  87     {"C", 0x43},
  88     {"D", 0x44},
  89     {"E", 0x45},
  90     {"F", 0x46},
  91     {"G", 0x47},
  92     {"H", 0x48},
  93     {"I", 0x49},
  94     {"J", 0x4a},
  95     {"K", 0x4b},
  96     {"L", 0x4c},
  97     {"M", 0x4d},
  98     {"N", 0x4e},
  99     {"NUL", 0x00},
 100     {"O", 0x4f},
 101     {"P", 0x50},
 102     {"Q", 0x51},
 103     {"R", 0x52},
 104     {"S", 0x53},
 105     {"T", 0x54},
 106     {"U", 0x55},
 107     {"V", 0x56},
 108     {"W", 0x57},
 109     {"X", 0x58},
 110     {"Y", 0x59},
 111     {"Z", 0x5a},
 112     {"a", 0x61},
 113     {"alert", 0x07},
 114     {"ampersand", 0x26},
 115     {"apostrophe", 0x27},
 116     {"asterisk", 0x2a},
 117     {"b", 0x62},
 118     {"backslash", 0x5c},
 119     {"backspace", 0x08},
 120     {"c", 0x63},
 121     {"carriage-return", 0x0d},
 122     {"circumflex", 0x5e},
 123     {"circumflex-accent", 0x5e},
 124     {"colon", 0x3a},
 125     {"comma", 0x2c},
 126     {"commercial-at", 0x40},
 127     {"d", 0x64},
 128     {"dollar-sign", 0x24},
 129     {"e", 0x65},
 130     {"eight", 0x38},
 131     {"equals-sign", 0x3d},
 132     {"exclamation-mark", 0x21},
 133     {"f", 0x66},
 134     {"five", 0x35},
 135     {"form-feed", 0x0c},
 136     {"four", 0x34},
 137     {"full-stop", 0x2e},
 138     {"g", 0x67},
 139     {"grave-accent", 0x60},
 140     {"greater-than-sign", 0x3e},
 141     {"h", 0x68},
 142     {"hyphen", 0x2d},
 143     {"hyphen-minus", 0x2d},
 144     {"i", 0x69},
 145     {"j", 0x6a},
 146     {"k", 0x6b},
 147     {"l", 0x6c},
 148     {"left-brace", 0x7b},
 149     {"left-curly-bracket", 0x7b},
 150     {"left-parenthesis", 0x28},
 151     {"left-square-bracket", 0x5b},
 152     {"less-than-sign", 0x3c},
 153     {"low-line", 0x5f},
 154     {"m", 0x6d},
 155     {"n", 0x6e},
 156     {"newline", 0x0a},
 157     {"nine", 0x39},
 158     {"number-sign", 0x23},
 159     {"o", 0x6f},
 160     {"one", 0x31},
 161     {"p", 0x70},
 162     {"percent-sign", 0x25},
 163     {"period", 0x2e},
 164     {"plus-sign", 0x2b},
 165     {"q", 0x71},
 166     {"question-mark", 0x3f},
 167     {"quotation-mark", 0x22},
 168     {"r", 0x72},
 169     {"reverse-solidus", 0x5c},
 170     {"right-brace", 0x7d},
 171     {"right-curly-bracket", 0x7d},
 172     {"right-parenthesis", 0x29},
 173     {"right-square-bracket", 0x5d},
 174     {"s", 0x73},
 175     {"semicolon", 0x3b},
 176     {"seven", 0x37},
 177     {"six", 0x36},
 178     {"slash", 0x2f},
 179     {"solidus", 0x2f},
 180     {"space", 0x20},
 181     {"t", 0x74},
 182     {"tab", 0x09},
 183     {"three", 0x33},
 184     {"tilde", 0x7e},
 185     {"two", 0x32},
 186     {"u", 0x75},
 187     {"underscore", 0x5f},
 188     {"v", 0x76},
 189     {"vertical-line", 0x7c},
 190     {"vertical-tab", 0x0b},
 191     {"w", 0x77},
 192     {"x", 0x78},
 193     {"y", 0x79},
 194     {"z", 0x7a},
 195     {"zero", 0x30}
 196 };
 197
 198 #pragma clang diagnostic push
 199 #pragma clang diagnostic ignored "-Wpadded"
 200
 201 struct classnames
 202 {
 203     const char* elem_;
 204     ctype_base::mask mask_;
 205 };
 206
 207 #pragma clang diagnostic pop
 208
 209 const classnames ClassNames[] =
 210 {
 211     {"alnum",  ctype_base::alnum},
 212     {"alpha",  ctype_base::alpha},
 213     {"blank",  ctype_base::blank},
 214     {"cntrl",  ctype_base::cntrl},
 215     {"d",      ctype_base::digit},
 216     {"digit",  ctype_base::digit},
 217     {"graph",  ctype_base::graph},
 218     {"lower",  ctype_base::lower},
 219     {"print",  ctype_base::print},
 220     {"punct",  ctype_base::punct},
 221     {"s",      ctype_base::space},
 222     {"space",  ctype_base::space},
 223     {"upper",  ctype_base::upper},
 224     {"w",      regex_traits<char>::__regex_word},
 225     {"xdigit", ctype_base::xdigit}
 226 };
 227
 228 struct use_strcmp
 229 {
 230     bool operator()(const collationnames& x, const char* y)
 231         {return strcmp(x.elem_, y) < 0;}
 232     bool operator()(const classnames& x, const char* y)
 233         {return strcmp(x.elem_, y) < 0;}
 234 };
 235
 236 }
 237
 238 string
 239 __get_collation_name(const char* s)
 240 {
 241     const collationnames* i =
 242             _VSTD::lower_bound(begin(collatenames), end(collatenames), s, use_strcmp());
 243     string r;
 244     if (i != end(collatenames) && strcmp(s, i->elem_) == 0)
 245         r = char(i->char_);
 246     return r;
 247 }
 248
 249 ctype_base::mask
 250 __get_classname(const char* s, bool __icase)
 251 {
 252     const classnames* i =
 253             _VSTD::lower_bound(begin(ClassNames), end(ClassNames), s, use_strcmp());
 254     ctype_base::mask r = 0;
 255     if (i != end(ClassNames) && strcmp(s, i->elem_) == 0)
 256     {
 257         r = i->mask_;
 258         if (r == regex_traits<char>::__regex_word)
 259             r |= ctype_base::alnum | ctype_base::upper | ctype_base::lower;
 260         else if (__icase)
 261         {
 262             if (r & (ctype_base::lower | ctype_base::upper))
 263                 r |= ctype_base::alpha;
 264         }
 265     }
 266     return r;
 267 }
 268
 269 template <>
 270 void
 271 __match_any_but_newline<char>::__exec(__state& __s) const
 272 {
 273     if (__s.__current_ != __s.__last_)
 274     {
 275         switch (*__s.__current_)
 276         {
 277         case '\r':
 278         case '\n':
 279             __s.__do_ = __state::__reject;
 280             __s.__node_ = nullptr;
 281             break;
 282         default:
 283             __s.__do_ = __state::__accept_and_consume;
 284             ++__s.__current_;
 285             __s.__node_ = this->first();
 286             break;
 287         }
 288     }
 289     else
 290     {
 291         __s.__do_ = __state::__reject;
 292         __s.__node_ = nullptr;
 293     }
 294 }
 295
 296 template <>
 297 void
 298 __match_any_but_newline<wchar_t>::__exec(__state& __s) const
 299 {
 300     if (__s.__current_ != __s.__last_)
 301     {
 302         switch (*__s.__current_)
 303         {
 304         case '\r':
 305         case '\n':
 306         case 0x2028:
 307         case 0x2029:
 308             __s.__do_ = __state::__reject;
 309             __s.__node_ = nullptr;
 310             break;
 311         default:
 312             __s.__do_ = __state::__accept_and_consume;
 313             ++__s.__current_;
 314             __s.__node_ = this->first();
 315             break;
 316         }
 317     }
 318     else
 319     {
 320         __s.__do_ = __state::__reject;
 321         __s.__node_ = nullptr;
 322     }
 323 }
 324
 325 _LIBCPP_END_NAMESPACE_STD