v8/src/dateparser.cc
lrn@chromium.org ff9ce1abd4 Make date parser handle all ES5 Date Time Strings correctly.
This means that ES5 Date Time Strings will default to UTC if timezone is absent.
Handle as many legacy strings as possible the same way as before

BUG=v8:1498
TEST=mjsunit/date

Review URL: http://codereview.chromium.org/7291022

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8513 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-07-01 11:41:45 +00:00

213 lines
6.9 KiB
C++

// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "v8.h"
#include "dateparser.h"
namespace v8 {
namespace internal {
bool DateParser::DayComposer::Write(FixedArray* output) {
if (index_ < 1) return false;
// Day and month defaults to 1.
while (index_ < kSize) {
comp_[index_++] = 1;
}
int year = 0; // Default year is 0 (=> 2000) for KJS compatibility.
int month = kNone;
int day = kNone;
if (named_month_ == kNone) {
if (is_iso_date_ || (index_ == 3 && !IsDay(comp_[0]))) {
// YMD
year = comp_[0];
month = comp_[1];
day = comp_[2];
} else {
// MD(Y)
month = comp_[0];
day = comp_[1];
if (index_ == 3) year = comp_[2];
}
} else {
month = named_month_;
if (index_ == 1) {
// MD or DM
day = comp_[0];
} else if (!IsDay(comp_[0])) {
// YMD, MYD, or YDM
year = comp_[0];
day = comp_[1];
} else {
// DMY, MDY, or DYM
day = comp_[0];
year = comp_[1];
}
}
if (!is_iso_date_) {
if (Between(year, 0, 49)) year += 2000;
else if (Between(year, 50, 99)) year += 1900;
}
if (!Smi::IsValid(year) || !IsMonth(month) || !IsDay(day)) return false;
output->set(YEAR, Smi::FromInt(year));
output->set(MONTH, Smi::FromInt(month - 1)); // 0-based
output->set(DAY, Smi::FromInt(day));
return true;
}
bool DateParser::TimeComposer::Write(FixedArray* output) {
// All time slots default to 0
while (index_ < kSize) {
comp_[index_++] = 0;
}
int& hour = comp_[0];
int& minute = comp_[1];
int& second = comp_[2];
int& millisecond = comp_[3];
if (hour_offset_ != kNone) {
if (!IsHour12(hour)) return false;
hour %= 12;
hour += hour_offset_;
}
if (!IsHour(hour) || !IsMinute(minute) ||
!IsSecond(second) || !IsMillisecond(millisecond)) return false;
output->set(HOUR, Smi::FromInt(hour));
output->set(MINUTE, Smi::FromInt(minute));
output->set(SECOND, Smi::FromInt(second));
output->set(MILLISECOND, Smi::FromInt(millisecond));
return true;
}
bool DateParser::TimeZoneComposer::Write(FixedArray* output) {
if (sign_ != kNone) {
if (hour_ == kNone) hour_ = 0;
if (minute_ == kNone) minute_ = 0;
int total_seconds = sign_ * (hour_ * 3600 + minute_ * 60);
if (!Smi::IsValid(total_seconds)) return false;
output->set(UTC_OFFSET, Smi::FromInt(total_seconds));
} else {
output->set_null(UTC_OFFSET);
}
return true;
}
const int8_t DateParser::KeywordTable::
array[][DateParser::KeywordTable::kEntrySize] = {
{'j', 'a', 'n', DateParser::MONTH_NAME, 1},
{'f', 'e', 'b', DateParser::MONTH_NAME, 2},
{'m', 'a', 'r', DateParser::MONTH_NAME, 3},
{'a', 'p', 'r', DateParser::MONTH_NAME, 4},
{'m', 'a', 'y', DateParser::MONTH_NAME, 5},
{'j', 'u', 'n', DateParser::MONTH_NAME, 6},
{'j', 'u', 'l', DateParser::MONTH_NAME, 7},
{'a', 'u', 'g', DateParser::MONTH_NAME, 8},
{'s', 'e', 'p', DateParser::MONTH_NAME, 9},
{'o', 'c', 't', DateParser::MONTH_NAME, 10},
{'n', 'o', 'v', DateParser::MONTH_NAME, 11},
{'d', 'e', 'c', DateParser::MONTH_NAME, 12},
{'a', 'm', '\0', DateParser::AM_PM, 0},
{'p', 'm', '\0', DateParser::AM_PM, 12},
{'u', 't', '\0', DateParser::TIME_ZONE_NAME, 0},
{'u', 't', 'c', DateParser::TIME_ZONE_NAME, 0},
{'z', '\0', '\0', DateParser::TIME_ZONE_NAME, 0},
{'g', 'm', 't', DateParser::TIME_ZONE_NAME, 0},
{'c', 'd', 't', DateParser::TIME_ZONE_NAME, -5},
{'c', 's', 't', DateParser::TIME_ZONE_NAME, -6},
{'e', 'd', 't', DateParser::TIME_ZONE_NAME, -4},
{'e', 's', 't', DateParser::TIME_ZONE_NAME, -5},
{'m', 'd', 't', DateParser::TIME_ZONE_NAME, -6},
{'m', 's', 't', DateParser::TIME_ZONE_NAME, -7},
{'p', 'd', 't', DateParser::TIME_ZONE_NAME, -7},
{'p', 's', 't', DateParser::TIME_ZONE_NAME, -8},
{'t', '\0', '\0', DateParser::TIME_SEPARATOR, 0},
{'\0', '\0', '\0', DateParser::INVALID, 0},
};
// We could use perfect hashing here, but this is not a bottleneck.
int DateParser::KeywordTable::Lookup(const uint32_t* pre, int len) {
int i;
for (i = 0; array[i][kTypeOffset] != INVALID; i++) {
int j = 0;
while (j < kPrefixLength &&
pre[j] == static_cast<uint32_t>(array[i][j])) {
j++;
}
// Check if we have a match and the length is legal.
// Word longer than keyword is only allowed for month names.
if (j == kPrefixLength &&
(len <= kPrefixLength || array[i][kTypeOffset] == MONTH_NAME)) {
return i;
}
}
return i;
}
int DateParser::ReadMilliseconds(DateToken token) {
// Read first three significant digits of the original numeral,
// as inferred from the value and the number of digits.
// I.e., use the number of digits to see if there were
// leading zeros.
int number = token.number();
int length = token.length();
if (length < 3) {
// Less than three digits. Multiply to put most significant digit
// in hundreds position.
if (length == 1) {
number *= 100;
} else if (length == 2) {
number *= 10;
}
} else if (length > 3) {
if (length > kMaxSignificantDigits) length = kMaxSignificantDigits;
// More than three digits. Divide by 10^(length - 3) to get three
// most significant digits.
int factor = 1;
do {
ASSERT(factor <= 100000000); // factor won't overflow.
factor *= 10;
length--;
} while (length > 3);
number /= factor;
}
return number;
}
} } // namespace v8::internal