regex.cpp revision 227983 
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
16static
17const char*
18make_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
63regex_error::regex_error(regex_constants::error_type ecode)
64    : runtime_error(make_error_type_string(ecode)),
65      __code_(ecode)
66{}
67
68regex_error::~regex_error() throw() {}
69
70namespace {
71
72struct collationnames
73{
74    const char* elem_;
75    char char_;
76};
77
78const collationnames collatenames[] =
79{
80    {"A", 0x41},
81    {"B", 0x42},
82    {"C", 0x43},
83    {"D", 0x44},
84    {"E", 0x45},
85    {"F", 0x46},
86    {"G", 0x47},
87    {"H", 0x48},
88    {"I", 0x49},
89    {"J", 0x4a},
90    {"K", 0x4b},
91    {"L", 0x4c},
92    {"M", 0x4d},
93    {"N", 0x4e},
94    {"NUL", 0x00},
95    {"O", 0x4f},
96    {"P", 0x50},
97    {"Q", 0x51},
98    {"R", 0x52},
99    {"S", 0x53},
100    {"T", 0x54},
101    {"U", 0x55},
102    {"V", 0x56},
103    {"W", 0x57},
104    {"X", 0x58},
105    {"Y", 0x59},
106    {"Z", 0x5a},
107    {"a", 0x61},
108    {"alert", 0x07},
109    {"ampersand", 0x26},
110    {"apostrophe", 0x27},
111    {"asterisk", 0x2a},
112    {"b", 0x62},
113    {"backslash", 0x5c},
114    {"backspace", 0x08},
115    {"c", 0x63},
116    {"carriage-return", 0x0d},
117    {"circumflex", 0x5e},
118    {"circumflex-accent", 0x5e},
119    {"colon", 0x3a},
120    {"comma", 0x2c},
121    {"commercial-at", 0x40},
122    {"d", 0x64},
123    {"dollar-sign", 0x24},
124    {"e", 0x65},
125    {"eight", 0x38},
126    {"equals-sign", 0x3d},
127    {"exclamation-mark", 0x21},
128    {"f", 0x66},
129    {"five", 0x35},
130    {"form-feed", 0x0c},
131    {"four", 0x34},
132    {"full-stop", 0x2e},
133    {"g", 0x67},
134    {"grave-accent", 0x60},
135    {"greater-than-sign", 0x3e},
136    {"h", 0x68},
137    {"hyphen", 0x2d},
138    {"hyphen-minus", 0x2d},
139    {"i", 0x69},
140    {"j", 0x6a},
141    {"k", 0x6b},
142    {"l", 0x6c},
143    {"left-brace", 0x7b},
144    {"left-curly-bracket", 0x7b},
145    {"left-parenthesis", 0x28},
146    {"left-square-bracket", 0x5b},
147    {"less-than-sign", 0x3c},
148    {"low-line", 0x5f},
149    {"m", 0x6d},
150    {"n", 0x6e},
151    {"newline", 0x0a},
152    {"nine", 0x39},
153    {"number-sign", 0x23},
154    {"o", 0x6f},
155    {"one", 0x31},
156    {"p", 0x70},
157    {"percent-sign", 0x25},
158    {"period", 0x2e},
159    {"plus-sign", 0x2b},
160    {"q", 0x71},
161    {"question-mark", 0x3f},
162    {"quotation-mark", 0x22},
163    {"r", 0x72},
164    {"reverse-solidus", 0x5c},
165    {"right-brace", 0x7d},
166    {"right-curly-bracket", 0x7d},
167    {"right-parenthesis", 0x29},
168    {"right-square-bracket", 0x5d},
169    {"s", 0x73},
170    {"semicolon", 0x3b},
171    {"seven", 0x37},
172    {"six", 0x36},
173    {"slash", 0x2f},
174    {"solidus", 0x2f},
175    {"space", 0x20},
176    {"t", 0x74},
177    {"tab", 0x09},
178    {"three", 0x33},
179    {"tilde", 0x7e},
180    {"two", 0x32},
181    {"u", 0x75},
182    {"underscore", 0x5f},
183    {"v", 0x76},
184    {"vertical-line", 0x7c},
185    {"vertical-tab", 0x0b},
186    {"w", 0x77},
187    {"x", 0x78},
188    {"y", 0x79},
189    {"z", 0x7a},
190    {"zero", 0x30}
191};
192
193struct classnames
194{
195    const char* elem_;
196    ctype_base::mask mask_;
197};
198
199const classnames ClassNames[] =
200{
201    {"alnum",  ctype_base::alnum},
202    {"alpha",  ctype_base::alpha},
203    {"blank",  ctype_base::blank},
204    {"cntrl",  ctype_base::cntrl},
205    {"d",      ctype_base::digit},
206    {"digit",  ctype_base::digit},
207    {"graph",  ctype_base::graph},
208    {"lower",  ctype_base::lower},
209    {"print",  ctype_base::print},
210    {"punct",  ctype_base::punct},
211    {"s",      ctype_base::space},
212    {"space",  ctype_base::space},
213    {"upper",  ctype_base::upper},
214    {"w",      regex_traits<char>::__regex_word},
215    {"xdigit", ctype_base::xdigit}
216};
217
218struct use_strcmp
219{
220    bool operator()(const collationnames& x, const char* y)
221        {return strcmp(x.elem_, y) < 0;}
222    bool operator()(const classnames& x, const char* y)
223        {return strcmp(x.elem_, y) < 0;}
224};
225
226}
227
228string
229__get_collation_name(const char* s)
230{
231    const collationnames* i =
232            _VSTD::lower_bound(begin(collatenames), end(collatenames), s, use_strcmp());
233    string r;
234    if (i != end(collatenames) && strcmp(s, i->elem_) == 0)
235        r = char(i->char_);
236    return r;
237}
238
239ctype_base::mask
240__get_classname(const char* s, bool __icase)
241{
242    const classnames* i =
243            _VSTD::lower_bound(begin(ClassNames), end(ClassNames), s, use_strcmp());
244    ctype_base::mask r = 0;
245    if (i != end(ClassNames) && strcmp(s, i->elem_) == 0)
246    {
247        r = i->mask_;
248        if (r == regex_traits<char>::__regex_word)
249            r |= ctype_base::alnum | ctype_base::upper | ctype_base::lower;
250        else if (__icase)
251        {
252            if (r & (ctype_base::lower | ctype_base::upper))
253                r |= ctype_base::alpha;
254        }
255    }
256    return r;
257}
258
259template <>
260void
261__match_any_but_newline<char>::__exec(__state& __s) const
262{
263    if (__s.__current_ != __s.__last_)
264    {
265        switch (*__s.__current_)
266        {
267        case '\r':
268        case '\n':
269            __s.__do_ = __state::__reject;
270            __s.__node_ = nullptr;
271            break;
272        default:
273            __s.__do_ = __state::__accept_and_consume;
274            ++__s.__current_;
275            __s.__node_ = this->first();
276            break;
277        }
278    }
279    else
280    {
281        __s.__do_ = __state::__reject;
282        __s.__node_ = nullptr;
283    }
284}
285
286template <>
287void
288__match_any_but_newline<wchar_t>::__exec(__state& __s) const
289{
290    if (__s.__current_ != __s.__last_)
291    {
292        switch (*__s.__current_)
293        {
294        case '\r':
295        case '\n':
296        case 0x2028:
297        case 0x2029:
298            __s.__do_ = __state::__reject;
299            __s.__node_ = nullptr;
300            break;
301        default:
302            __s.__do_ = __state::__accept_and_consume;
303            ++__s.__current_;
304            __s.__node_ = this->first();
305            break;
306        }
307    }
308    else
309    {
310        __s.__do_ = __state::__reject;
311        __s.__node_ = nullptr;
312    }
313}
314
315_LIBCPP_END_NAMESPACE_STD
316