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[intl] Enhance Date parser to take Unicode SPACE

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This is needed to prepare for the landing of ICU72.
Allow U+202F in the Date String, which the toLocaleString("en-US")
will generate w/ ICU72.

Bug: v8:13494
Change-Id: I41b83c4094ce3d0737a72dcd6310b52c68fdcdca
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4027341
Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Jungshik Shin <jshin@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/main@{#84308}
This commit is contained in:
Frank Tang 2022-11-16 09:18:45 -08:00 committed by V8 LUCI CQ
parent 78bd802348
commit 2ada52cffb
3 changed files with 51 additions and 2 deletions
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2
src/date/dateparser-inl.h
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@ -192,7 +192,7 @@ DateParser::DateToken DateParser::DateStringTokenizer<CharType>::Scan() {
if (in_->Skip('+')) return DateToken::Symbol('+');
if (in_->Skip('.')) return DateToken::Symbol('.');
if (in_->Skip(')')) return DateToken::Symbol(')');
if (in_->IsAsciiAlphaOrAbove()) {
if (in_->IsAsciiAlphaOrAbove() && !in_->IsWhiteSpaceChar()) {
DCHECK_EQ(KeywordTable::kPrefixLength, 3);
uint32_t buffer[3] = {0, 0, 0};
int length = in_->ReadWord(buffer, 3);

4
src/date/dateparser.h
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@ -91,7 +91,8 @@ class DateParser : public AllStatic {
// Return word length.
int ReadWord(uint32_t* prefix, int prefix_size) {
int len;
for (len = 0; IsAsciiAlphaOrAbove(); Next(), len++) {
for (len = 0; IsAsciiAlphaOrAbove() && !IsWhiteSpaceChar();
Next(), len++) {
if (len < prefix_size) prefix[len] = AsciiAlphaToLower(ch_);
}
for (int i = len; i < prefix_size; i++) prefix[i] = 0;
@ -115,6 +116,7 @@ class DateParser : public AllStatic {
bool IsEnd() const { return ch_ == 0; }
bool IsAsciiDigit() const { return IsDecimalDigit(ch_); }
bool IsAsciiAlphaOrAbove() const { return ch_ >= 'A'; }
bool IsWhiteSpaceChar() const { return IsWhiteSpace(ch_); }
bool IsAsciiSign() const { return ch_ == '+' || ch_ == '-'; }
// Return 1 for '+' and -1 for '-'.

47
test/intl/regress-13494.js Normal file
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@ -0,0 +1,47 @@
// Copyright 2022 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Test the new Date( date.toLocaleString("en-US")) is not invalid.
// This is not guaranteed by the standard but many code use that to set the
// timezone as suggested in
// https://stackoverflow.com/questions/15141762/how-to-initialize-a-javascript-date-to-a-particular-time-zone
let d = new Date();
// https://tc39.es/ecma262/#sec-todatestring
// 21.4.4.41.4 ToDateString ( tv )
// 1. If tv is NaN, return "Invalid Date".
let invalid = "Invalid Date";
let largestDiff = 25*60*60*1000;
let garbage = new Date("garbage");
assertTrue(invalid == garbage);
assertEquals(NaN, garbage.getTime());
let d1 = new Date(d.toLocaleString("en-US"));
assertTrue(d1 != invalid);
assertTrue(d1.getTime() != NaN);
// The milliseconds are different between d1 and d.
assertTrue(Math.abs(d1-d) < 1000);
// Force a version of date string which have U+202f before AM
let nnbsp_am = new Date("11/16/2022, 9:04:55\u202fAM");
assertTrue(nnbsp_am != invalid);
assertTrue(nnbsp_am.getTime() != NaN);
// Force a version of date string which have U+202f before PM
let nnbsp_pm = new Date("11/16/2022, 9:04:55\u202fPM");
assertTrue(nnbsp_pm != invalid);
assertTrue(nnbsp_pm.getTime() != NaN);
let d2 = new Date(d.toLocaleString("en-US", {timeZone: "Asia/Taipei"}));
assertTrue(d2 != invalid);
assertTrue(d2.getTime() != NaN);
// The differences should be within 25 hours.
assertTrue(Math.abs(d2-d) < largestDiff);
let d3 = new Date(d.toLocaleString("en-US", {timeZone: "Africa/Lusaka"}));
assertTrue(d3 != invalid);
assertTrue(d3.getTime() != NaN);
// The differences should be within 25 hours.
assertTrue(Math.abs(d3-d) < largestDiff);