1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
|
/*
* Copyright (c) 2020, Emanuel Sprung <emanuel.sprung@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include "RegexByteCode.h"
#include "RegexMatch.h"
#include "RegexOptions.h"
#include "RegexParser.h"
#include <AK/Forward.h>
#include <AK/GenericLexer.h>
#include <AK/HashMap.h>
#include <AK/NonnullOwnPtrVector.h>
#include <AK/Types.h>
#include <AK/Utf32View.h>
#include <AK/Vector.h>
#include <ctype.h>
#include <stdio.h>
namespace regex {
namespace Detail {
struct Block {
size_t start;
size_t end;
};
}
static constexpr const size_t c_max_recursion = 5000;
static constexpr const size_t c_match_preallocation_count = 0;
struct RegexResult final {
bool success { false };
size_t count { 0 };
Vector<Match> matches;
Vector<Vector<Match>> capture_group_matches;
size_t n_operations { 0 };
size_t n_capture_groups { 0 };
size_t n_named_capture_groups { 0 };
};
template<class Parser>
class Regex;
template<class Parser>
class Matcher final {
public:
Matcher(Regex<Parser> const* pattern, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {})
: m_pattern(pattern)
, m_regex_options(regex_options.value_or({}))
{
}
~Matcher() = default;
RegexResult match(RegexStringView, Optional<typename ParserTraits<Parser>::OptionsType> = {}) const;
RegexResult match(Vector<RegexStringView> const&, Optional<typename ParserTraits<Parser>::OptionsType> = {}) const;
typename ParserTraits<Parser>::OptionsType options() const
{
return m_regex_options;
}
void reset_pattern(Badge<Regex<Parser>>, Regex<Parser> const* pattern)
{
m_pattern = pattern;
}
private:
Optional<bool> execute(MatchInput const& input, MatchState& state, size_t& operations) const;
Regex<Parser> const* m_pattern;
typename ParserTraits<Parser>::OptionsType const m_regex_options;
};
template<class Parser>
class Regex final {
public:
String pattern_value;
regex::Parser::Result parser_result;
OwnPtr<Matcher<Parser>> matcher { nullptr };
mutable size_t start_offset { 0 };
static regex::Parser::Result parse_pattern(StringView pattern, typename ParserTraits<Parser>::OptionsType regex_options = {});
explicit Regex(String pattern, typename ParserTraits<Parser>::OptionsType regex_options = {});
Regex(regex::Parser::Result parse_result, String pattern, typename ParserTraits<Parser>::OptionsType regex_options = {});
~Regex() = default;
Regex(Regex&&);
Regex& operator=(Regex&&);
typename ParserTraits<Parser>::OptionsType options() const;
void print_bytecode(FILE* f = stdout) const;
String error_string(Optional<String> message = {}) const;
RegexResult match(RegexStringView view, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {}) const
{
if (!matcher || parser_result.error != Error::NoError)
return {};
return matcher->match(view, regex_options);
}
RegexResult match(Vector<RegexStringView> const& views, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {}) const
{
if (!matcher || parser_result.error != Error::NoError)
return {};
return matcher->match(views, regex_options);
}
String replace(RegexStringView view, StringView replacement_pattern, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {}) const
{
if (!matcher || parser_result.error != Error::NoError)
return {};
StringBuilder builder;
size_t start_offset = 0;
RegexResult result = matcher->match(view, regex_options);
if (!result.success)
return view.to_string();
for (size_t i = 0; i < result.matches.size(); ++i) {
auto& match = result.matches[i];
builder.append(view.substring_view(start_offset, match.global_offset - start_offset).to_string());
start_offset = match.global_offset + match.view.length();
GenericLexer lexer(replacement_pattern);
while (!lexer.is_eof()) {
if (lexer.consume_specific('\\')) {
if (lexer.consume_specific('\\')) {
builder.append('\\');
continue;
}
auto number = lexer.consume_while(isdigit);
if (auto index = number.to_uint(); index.has_value() && result.n_capture_groups >= index.value()) {
builder.append(result.capture_group_matches[i][index.value() - 1].view.to_string());
} else {
builder.appendff("\\{}", number);
}
} else {
builder.append(lexer.consume_while([](auto ch) { return ch != '\\'; }));
}
}
}
builder.append(view.substring_view(start_offset, view.length() - start_offset).to_string());
return builder.to_string();
}
// FIXME: replace(Vector<RegexStringView> const , ...)
RegexResult search(RegexStringView view, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {}) const
{
if (!matcher || parser_result.error != Error::NoError)
return {};
AllOptions options = (AllOptions)regex_options.value_or({});
if ((options & AllFlags::MatchNotBeginOfLine) && (options & AllFlags::MatchNotEndOfLine)) {
options.reset_flag(AllFlags::MatchNotEndOfLine);
options.reset_flag(AllFlags::MatchNotBeginOfLine);
}
options.reset_flag(AllFlags::Internal_Stateful);
options |= AllFlags::Global;
return matcher->match(view, options);
}
RegexResult search(Vector<RegexStringView> const& views, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {}) const
{
if (!matcher || parser_result.error != Error::NoError)
return {};
AllOptions options = (AllOptions)regex_options.value_or({});
if ((options & AllFlags::MatchNotBeginOfLine) && (options & AllFlags::MatchNotEndOfLine)) {
options.reset_flag(AllFlags::MatchNotEndOfLine);
options.reset_flag(AllFlags::MatchNotBeginOfLine);
}
options.reset_flag(AllFlags::Internal_Stateful);
options |= AllFlags::Global;
return matcher->match(views, options);
}
bool match(RegexStringView view, RegexResult& m, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {}) const
{
m = match(view, regex_options);
return m.success;
}
bool match(Vector<RegexStringView> const& views, RegexResult& m, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {}) const
{
m = match(views, regex_options);
return m.success;
}
bool search(RegexStringView view, RegexResult& m, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {}) const
{
m = search(view, regex_options);
return m.success;
}
bool search(Vector<RegexStringView> const& views, RegexResult& m, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {}) const
{
m = search(views, regex_options);
return m.success;
}
bool has_match(RegexStringView view, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {}) const
{
if (!matcher || parser_result.error != Error::NoError)
return false;
RegexResult result = matcher->match(view, AllOptions { regex_options.value_or({}) } | AllFlags::SkipSubExprResults);
return result.success;
}
bool has_match(Vector<RegexStringView> const& views, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {}) const
{
if (!matcher || parser_result.error != Error::NoError)
return false;
RegexResult result = matcher->match(views, AllOptions { regex_options.value_or({}) } | AllFlags::SkipSubExprResults);
return result.success;
}
private:
void run_optimization_passes();
using BasicBlockList = Vector<Detail::Block>;
BasicBlockList split_basic_blocks();
void attempt_rewrite_loops_as_atomic_groups(BasicBlockList const&);
};
// free standing functions for match, search and has_match
template<class Parser>
RegexResult match(RegexStringView view, Regex<Parser>& pattern, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {})
{
return pattern.match(view, regex_options);
}
template<class Parser>
RegexResult match(Vector<RegexStringView> const& view, Regex<Parser>& pattern, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {})
{
return pattern.match(view, regex_options);
}
template<class Parser>
bool match(RegexStringView view, Regex<Parser>& pattern, RegexResult&, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {})
{
return pattern.match(view, regex_options);
}
template<class Parser>
bool match(Vector<RegexStringView> const& view, Regex<Parser>& pattern, RegexResult&, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {})
{
return pattern.match(view, regex_options);
}
template<class Parser>
RegexResult search(RegexStringView view, Regex<Parser>& pattern, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {})
{
return pattern.search(view, regex_options);
}
template<class Parser>
RegexResult search(Vector<RegexStringView> const& views, Regex<Parser>& pattern, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {})
{
return pattern.search(views, regex_options);
}
template<class Parser>
bool search(RegexStringView view, Regex<Parser>& pattern, RegexResult&, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {})
{
return pattern.search(view, regex_options);
}
template<class Parser>
bool search(Vector<RegexStringView> const& views, Regex<Parser>& pattern, RegexResult&, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {})
{
return pattern.search(views, regex_options);
}
template<class Parser>
bool has_match(RegexStringView view, Regex<Parser>& pattern, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {})
{
return pattern.has_match(view, regex_options);
}
template<class Parser>
bool has_match(Vector<RegexStringView> const& views, Regex<Parser>& pattern, Optional<typename ParserTraits<Parser>::OptionsType> regex_options = {})
{
return pattern.has_match(views, regex_options);
}
}
using regex::has_match;
using regex::match;
using regex::Regex;
using regex::RegexResult;
|
