Line data Source code
1 : // Copyright 2011 the V8 project authors. All rights reserved.
2 : // Use of this source code is governed by a BSD-style license that can be
3 : // found in the LICENSE file.
4 :
5 : #ifndef V8_DATEPARSER_INL_H_
6 : #define V8_DATEPARSER_INL_H_
7 :
8 : #include "src/char-predicates-inl.h"
9 : #include "src/dateparser.h"
10 : #include "src/unicode-cache-inl.h"
11 :
12 : namespace v8 {
13 : namespace internal {
14 :
15 : template <typename Char>
16 96949 : bool DateParser::Parse(Isolate* isolate, Vector<Char> str, FixedArray* out) {
17 : UnicodeCache* unicode_cache = isolate->unicode_cache();
18 : DCHECK(out->length() >= OUTPUT_SIZE);
19 : InputReader<Char> in(unicode_cache, str);
20 : DateStringTokenizer<Char> scanner(&in);
21 : TimeZoneComposer tz;
22 : TimeComposer time;
23 : DayComposer day;
24 :
25 : // Specification:
26 : // Accept ES5 ISO 8601 date-time-strings or legacy dates compatible
27 : // with Safari.
28 : // ES5 ISO 8601 dates:
29 : // [('-'|'+')yy]yyyy[-MM[-DD]][THH:mm[:ss[.sss]][Z|(+|-)hh:mm]]
30 : // where yyyy is in the range 0000..9999 and
31 : // +/-yyyyyy is in the range -999999..+999999 -
32 : // but -000000 is invalid (year zero must be positive),
33 : // MM is in the range 01..12,
34 : // DD is in the range 01..31,
35 : // MM and DD defaults to 01 if missing,,
36 : // HH is generally in the range 00..23, but can be 24 if mm, ss
37 : // and sss are zero (or missing), representing midnight at the
38 : // end of a day,
39 : // mm and ss are in the range 00..59,
40 : // sss is in the range 000..999,
41 : // hh is in the range 00..23,
42 : // mm, ss, and sss default to 00 if missing, and
43 : // timezone defaults to Z if missing
44 : // (following Safari, ISO actually demands local time).
45 : // Extensions:
46 : // We also allow sss to have more or less than three digits (but at
47 : // least one).
48 : // We allow hh:mm to be specified as hhmm.
49 : // Legacy dates:
50 : // Any unrecognized word before the first number is ignored.
51 : // Parenthesized text is ignored.
52 : // An unsigned number followed by ':' is a time value, and is
53 : // added to the TimeComposer. A number followed by '::' adds a second
54 : // zero as well. A number followed by '.' is also a time and must be
55 : // followed by milliseconds.
56 : // Any other number is a date component and is added to DayComposer.
57 : // A month name (or really: any word having the same first three letters
58 : // as a month name) is recorded as a named month in the Day composer.
59 : // A word recognizable as a time-zone is recorded as such, as is
60 : // '(+|-)(hhmm|hh:)'.
61 : // Legacy dates don't allow extra signs ('+' or '-') or umatched ')'
62 : // after a number has been read (before the first number, any garbage
63 : // is allowed).
64 : // Intersection of the two:
65 : // A string that matches both formats (e.g. 1970-01-01) will be
66 : // parsed as an ES5 date-time string - which means it will default
67 : // to UTC time-zone. That's unavoidable if following the ES5
68 : // specification.
69 : // After a valid "T" has been read while scanning an ES5 datetime string,
70 : // the input can no longer be a valid legacy date, since the "T" is a
71 : // garbage string after a number has been read.
72 :
73 : // First try getting as far as possible with as ES5 Date Time String.
74 96949 : DateToken next_unhandled_token = ParseES5DateTime(&scanner, &day, &time, &tz);
75 96949 : if (next_unhandled_token.IsInvalid()) return false;
76 96815 : bool has_read_number = !day.IsEmpty();
77 : // If there's anything left, continue with the legacy parser.
78 : bool legacy_parser = false;
79 1652189 : for (DateToken token = next_unhandled_token;
80 : !token.IsEndOfInput();
81 : token = scanner.Next()) {
82 1459116 : if (token.IsNumber()) {
83 : legacy_parser = true;
84 : has_read_number = true;
85 : int n = token.number();
86 455031 : if (scanner.SkipSymbol(':')) {
87 180107 : if (scanner.SkipSymbol(':')) {
88 : // n + "::"
89 0 : if (!time.IsEmpty()) return false;
90 : time.Add(n);
91 : time.Add(0);
92 : } else {
93 : // n + ":"
94 180107 : if (!time.Add(n)) return false;
95 180107 : if (scanner.Peek().IsSymbol('.')) scanner.Next();
96 : }
97 274924 : } else if (scanner.SkipSymbol('.') && time.IsExpecting(n)) {
98 : time.Add(n);
99 0 : if (!scanner.Peek().IsNumber()) return false;
100 0 : int n = ReadMilliseconds(scanner.Next());
101 0 : if (n < 0) return false;
102 : time.AddFinal(n);
103 274924 : } else if (tz.IsExpecting(n)) {
104 : tz.SetAbsoluteMinute(n);
105 549788 : } else if (time.IsExpecting(n)) {
106 : time.AddFinal(n);
107 : // Require end, white space, "Z", "+" or "-" immediately after
108 : // finalizing time.
109 : DateToken peek = scanner.Peek();
110 91431 : if (!peek.IsEndOfInput() &&
111 : !peek.IsWhiteSpace() &&
112 : !peek.IsKeywordZ() &&
113 : !peek.IsAsciiSign()) return false;
114 : } else {
115 183676 : if (!day.Add(n)) return false;
116 183676 : scanner.SkipSymbol('-');
117 : }
118 1004085 : } else if (token.IsKeyword()) {
119 : legacy_parser = true;
120 : // Parse a "word" (sequence of chars. >= 'A').
121 : KeywordType type = token.keyword_type();
122 : int value = token.keyword_value();
123 273079 : if (type == AM_PM && !time.IsEmpty()) {
124 : time.SetHourOffset(value);
125 272311 : } else if (type == MONTH_NAME) {
126 : day.SetNamedMonth(value);
127 91519 : scanner.SkipSymbol('-');
128 180792 : } else if (type == TIME_ZONE_NAME && has_read_number) {
129 : tz.Set(value);
130 : } else {
131 : // Garbage words are illegal if a number has been read.
132 90176 : if (has_read_number) return false;
133 : // The first number has to be separated from garbage words by
134 : // whitespace or other separators.
135 89879 : if (scanner.Peek().IsNumber()) return false;
136 : }
137 819309 : } else if (token.IsAsciiSign() && (tz.IsUTC() || !time.IsEmpty())) {
138 : legacy_parser = true;
139 : // Parse UTC offset (only after UTC or time).
140 : tz.SetSign(token.ascii_sign());
141 : // The following number may be empty.
142 : int n = 0;
143 : int length = 0;
144 88094 : if (scanner.Peek().IsNumber()) {
145 : DateToken token = scanner.Next();
146 : length = token.length();
147 : n = token.number();
148 : }
149 : has_read_number = true;
150 :
151 88094 : if (scanner.Peek().IsSymbol(':')) {
152 : tz.SetAbsoluteHour(n);
153 : // TODO(littledan): Use minutes as part of timezone?
154 : tz.SetAbsoluteMinute(kNone);
155 88064 : } else if (length == 2 || length == 1) {
156 : // Handle time zones like GMT-8
157 : tz.SetAbsoluteHour(n);
158 : tz.SetAbsoluteMinute(0);
159 88004 : } else if (length == 4 || length == 3) {
160 : // Looks like the hhmm format
161 87974 : tz.SetAbsoluteHour(n / 100);
162 87974 : tz.SetAbsoluteMinute(n % 100);
163 : } else {
164 : // No need to accept time zones like GMT-12345
165 : return false;
166 : }
167 1285615 : } else if ((token.IsAsciiSign() || token.IsSymbol(')')) &&
168 : has_read_number) {
169 : // Extra sign or ')' is illegal if a number has been read.
170 : return false;
171 : } else {
172 : // Ignore other characters and whitespace.
173 : }
174 : }
175 :
176 96258 : bool success = day.Write(out) && time.Write(out) && tz.Write(out);
177 :
178 96258 : if (legacy_parser && success) {
179 91538 : isolate->CountUsage(v8::Isolate::kLegacyDateParser);
180 : }
181 :
182 96258 : return success;
183 : }
184 :
185 :
186 : template<typename CharType>
187 1989082 : DateParser::DateToken DateParser::DateStringTokenizer<CharType>::Scan() {
188 4039886 : int pre_pos = in_->position();
189 1989082 : if (in_->IsEnd()) return DateToken::EndOfInput();
190 1800981 : if (in_->IsAsciiDigit()) {
191 580731 : int n = in_->ReadUnsignedNumeral();
192 1161462 : int length = in_->position() - pre_pos;
193 : return DateToken::Number(n, length);
194 : }
195 1220250 : if (in_->Skip(':')) return DateToken::Symbol(':');
196 1028056 : if (in_->Skip('-')) return DateToken::Symbol('-');
197 928147 : if (in_->Skip('+')) return DateToken::Symbol('+');
198 925612 : if (in_->Skip('.')) return DateToken::Symbol('.');
199 921691 : if (in_->Skip(')')) return DateToken::Symbol(')');
200 921634 : if (in_->IsAsciiAlphaOrAbove()) {
201 : DCHECK(KeywordTable::kPrefixLength == 3);
202 278762 : uint32_t buffer[3] = {0, 0, 0};
203 278762 : int length = in_->ReadWord(buffer, 3);
204 278762 : int index = KeywordTable::Lookup(buffer, length);
205 : return DateToken::Keyword(KeywordTable::GetType(index),
206 : KeywordTable::GetValue(index),
207 : length);
208 : }
209 642872 : if (in_->SkipWhiteSpace()) {
210 1096878 : return DateToken::WhiteSpace(in_->position() - pre_pos);
211 : }
212 94433 : if (in_->SkipParentheses()) {
213 : return DateToken::Unknown();
214 : }
215 1575 : in_->Next();
216 : return DateToken::Unknown();
217 : }
218 :
219 :
220 : template <typename Char>
221 642872 : bool DateParser::InputReader<Char>::SkipWhiteSpace() {
222 1285744 : if (unicode_cache_->IsWhiteSpaceOrLineTerminator(ch_)) {
223 : Next();
224 548439 : return true;
225 : }
226 : return false;
227 : }
228 :
229 :
230 : template <typename Char>
231 94433 : bool DateParser::InputReader<Char>::SkipParentheses() {
232 94433 : if (ch_ != '(') return false;
233 : int balance = 0;
234 466660 : do {
235 466660 : if (ch_ == ')') --balance;
236 373625 : else if (ch_ == '(') ++balance;
237 : Next();
238 : } while (balance > 0 && ch_);
239 : return true;
240 : }
241 :
242 :
243 : template <typename Char>
244 96949 : DateParser::DateToken DateParser::ParseES5DateTime(
245 194 : DateStringTokenizer<Char>* scanner, DayComposer* day, TimeComposer* time,
246 4559 : TimeZoneComposer* tz) {
247 : DCHECK(day->IsEmpty());
248 : DCHECK(time->IsEmpty());
249 : DCHECK(tz->IsEmpty());
250 :
251 : // Parse mandatory date string: [('-'|'+')yy]yyyy[':'MM[':'DD]]
252 96949 : if (scanner->Peek().IsAsciiSign()) {
253 : // Keep the sign token, so we can pass it back to the legacy
254 : // parser if we don't use it.
255 : DateToken sign_token = scanner->Next();
256 720 : if (!scanner->Peek().IsFixedLengthNumber(6)) return sign_token;
257 : int sign = sign_token.ascii_sign();
258 : int year = scanner->Next().number();
259 705 : if (sign < 0 && year == 0) return sign_token;
260 705 : day->Add(sign * year);
261 96229 : } else if (scanner->Peek().IsFixedLengthNumber(4)) {
262 : day->Add(scanner->Next().number());
263 : } else {
264 : return scanner->Next();
265 : }
266 5090 : if (scanner->SkipSymbol('-')) {
267 13854 : if (!scanner->Peek().IsFixedLengthNumber(2) ||
268 4618 : !DayComposer::IsMonth(scanner->Peek().number())) return scanner->Next();
269 : day->Add(scanner->Next().number());
270 4618 : if (scanner->SkipSymbol('-')) {
271 12399 : if (!scanner->Peek().IsFixedLengthNumber(2) ||
272 4138 : !DayComposer::IsDay(scanner->Peek().number())) return scanner->Next();
273 : day->Add(scanner->Next().number());
274 : }
275 : }
276 : // Check for optional time string: 'T'HH':'mm[':'ss['.'sss]]Z
277 5075 : if (!scanner->Peek().IsKeywordType(TIME_SEPARATOR)) {
278 524 : if (!scanner->Peek().IsEndOfInput()) return scanner->Next();
279 : } else {
280 : // ES5 Date Time String time part is present.
281 : scanner->Next();
282 13653 : if (!scanner->Peek().IsFixedLengthNumber(2) ||
283 4551 : !Between(scanner->Peek().number(), 0, 24)) {
284 : return DateToken::Invalid();
285 : }
286 : // Allow 24:00[:00[.000]], but no other time starting with 24.
287 4521 : bool hour_is_24 = (scanner->Peek().number() == 24);
288 : time->Add(scanner->Next().number());
289 4521 : if (!scanner->SkipSymbol(':')) return DateToken::Invalid();
290 13518 : if (!scanner->Peek().IsFixedLengthNumber(2) ||
291 4506 : !TimeComposer::IsMinute(scanner->Peek().number()) ||
292 4506 : (hour_is_24 && scanner->Peek().number() > 0)) {
293 : return DateToken::Invalid();
294 : }
295 : time->Add(scanner->Next().number());
296 4491 : if (scanner->SkipSymbol(':')) {
297 12663 : if (!scanner->Peek().IsFixedLengthNumber(2) ||
298 4221 : !TimeComposer::IsSecond(scanner->Peek().number()) ||
299 4221 : (hour_is_24 && scanner->Peek().number() > 0)) {
300 : return DateToken::Invalid();
301 : }
302 : time->Add(scanner->Next().number());
303 4206 : if (scanner->SkipSymbol('.')) {
304 7842 : if (!scanner->Peek().IsNumber() ||
305 3921 : (hour_is_24 && scanner->Peek().number() > 0)) {
306 : return DateToken::Invalid();
307 : }
308 : // Allow more or less than the mandated three digits.
309 3876 : time->Add(ReadMilliseconds(scanner->Next()));
310 : }
311 : }
312 : // Check for optional timezone designation: 'Z' | ('+'|'-')hh':'mm
313 4431 : if (scanner->Peek().IsKeywordZ()) {
314 : scanner->Next();
315 : tz->Set(0);
316 4993 : } else if (scanner->Peek().IsSymbol('+') ||
317 : scanner->Peek().IsSymbol('-')) {
318 3270 : tz->SetSign(scanner->Next().symbol() == '+' ? 1 : -1);
319 3270 : if (scanner->Peek().IsFixedLengthNumber(4)) {
320 : // hhmm extension syntax.
321 : int hourmin = scanner->Next().number();
322 30 : int hour = hourmin / 100;
323 30 : int min = hourmin % 100;
324 60 : if (!TimeComposer::IsHour(hour) || !TimeComposer::IsMinute(min)) {
325 : return DateToken::Invalid();
326 : }
327 : tz->SetAbsoluteHour(hour);
328 : tz->SetAbsoluteMinute(min);
329 : } else {
330 : // hh:mm standard syntax.
331 9720 : if (!scanner->Peek().IsFixedLengthNumber(2) ||
332 3240 : !TimeComposer::IsHour(scanner->Peek().number())) {
333 : return DateToken::Invalid();
334 : }
335 : tz->SetAbsoluteHour(scanner->Next().number());
336 3240 : if (!scanner->SkipSymbol(':')) return DateToken::Invalid();
337 9720 : if (!scanner->Peek().IsFixedLengthNumber(2) ||
338 3240 : !TimeComposer::IsMinute(scanner->Peek().number())) {
339 : return DateToken::Invalid();
340 : }
341 : tz->SetAbsoluteMinute(scanner->Next().number());
342 : }
343 : }
344 4431 : if (!scanner->Peek().IsEndOfInput()) return DateToken::Invalid();
345 : }
346 : // Successfully parsed ES5 Date Time String.
347 : // ES#sec-date-time-string-format Date Time String Format
348 : // "When the time zone offset is absent, date-only forms are interpreted
349 : // as a UTC time and date-time forms are interpreted as a local time."
350 4753 : if (tz->IsEmpty() && time->IsEmpty()) {
351 : tz->Set(0);
352 : }
353 : day->set_iso_date();
354 : return DateToken::EndOfInput();
355 : }
356 :
357 :
358 : } // namespace internal
359 : } // namespace v8
360 :
361 : #endif // V8_DATEPARSER_INL_H_
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