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DateTimeParser.h
506 lines (420 loc) · 11.7 KB
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DateTimeParser.h
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#ifndef FASTREAD_DATE_TIME_PARSER_H_
#define FASTREAD_DATE_TIME_PARSER_H_
#include "DateTime.h"
#include "LocaleInfo.h"
#include "QiParsers.h"
#include "boost.h"
#include <ctime>
// Parsing ---------------------------------------------------------------------
class DateTimeParser {
int year_, mon_, day_, hour_, min_, sec_;
double psec_;
int amPm_;
bool compactDate_; // used for guessing
int tzOffsetHours_, tzOffsetMinutes_;
std::string tz_;
LocaleInfo* pLocale_;
std::string tzDefault_;
const char* dateItr_;
const char* dateEnd_;
public:
DateTimeParser(LocaleInfo* pLocale)
: pLocale_(pLocale),
tzDefault_(pLocale->tz_),
dateItr_(NULL),
dateEnd_(NULL) {
reset();
}
// Parse ISO8601 date time. In benchmarks this only seems ~30% faster than
// parsing with a format string so it doesn't seem necessary to add individual
// parsers for other common formats.
bool parseISO8601(bool partial = true) {
// Date: YYYY-MM-DD, YYYYMMDD
if (!consumeInteger(4, &year_))
return false;
if (consumeThisChar('-'))
compactDate_ = false;
if (!consumeInteger1(2, &mon_))
return false;
if (!compactDate_ && !consumeThisChar('-'))
return false;
if (!consumeInteger1(2, &day_))
return false;
if (isComplete())
return true;
// Spec requires T, but common to use space instead
char next;
if (!consumeChar(&next))
return false;
if (next != 'T' && next != ' ')
return false;
// hh:mm:ss.sss, hh:mm:ss, hh:mm, hh
// hhmmss.sss, hhmmss, hhmm
if (!consumeInteger(2, &hour_))
return false;
consumeThisChar(':');
consumeInteger(2, &min_);
consumeThisChar(':');
consumeSeconds(&sec_, &psec_);
if (isComplete())
return true;
// Has a timezone
tz_ = "UTC";
if (!consumeTzOffset(&tzOffsetHours_, &tzOffsetMinutes_))
return false;
return isComplete();
}
bool parseLocaleTime() { return parse(pLocale_->timeFormat_); }
bool parseLocaleDate() { return parse(pLocale_->dateFormat_); }
// A flexible time parser for the most common formats
bool parseTime() {
if (!consumeInteger(2, &hour_, false))
return false;
if (!consumeThisChar(':'))
return false;
if (!consumeInteger(2, &min_))
return false;
consumeThisChar(':');
consumeSeconds(&sec_, NULL);
consumeWhiteSpace();
consumeString(pLocale_->amPm_, &amPm_);
consumeWhiteSpace();
return isComplete();
}
bool parseDate() {
// Date: YYYY-MM-DD, YYYY/MM/DD
if (!consumeInteger(4, &year_))
return false;
if (!consumeThisChar('-') && !consumeThisChar('/'))
return false;
if (!consumeInteger1(2, &mon_))
return false;
if (!consumeThisChar('-') && !consumeThisChar('/'))
return false;
if (!consumeInteger1(2, &day_))
return false;
return isComplete();
}
bool isComplete() { return dateItr_ == dateEnd_; }
void setDate(const char* date) {
reset();
dateItr_ = date;
dateEnd_ = date + strlen(date);
}
bool parse(const std::string& format) {
consumeWhiteSpace(); // always consume leading whitespace
std::string::const_iterator formatItr, formatEnd = format.end();
for (formatItr = format.begin(); formatItr != formatEnd; ++formatItr) {
// Whitespace in format matches 0 or more whitespace in date
if (std::isspace(*formatItr)) {
consumeWhiteSpace();
continue;
}
// Any other characters must much exactly.
if (*formatItr != '%') {
if (!consumeThisChar(*formatItr))
return false;
continue;
}
if (formatItr + 1 == formatEnd)
Rcpp::stop("Invalid format: trailing %");
formatItr++;
switch (*formatItr) {
case 'Y': // year with century
if (!consumeInteger(4, &year_))
return false;
break;
case 'y': // year without century
if (!consumeInteger(2, &year_))
return false;
year_ += (year_ < 69) ? 2000 : 1900;
break;
case 'm': // month
if (!consumeInteger1(2, &mon_, false))
return false;
break;
case 'b': // abbreviated month name
if (!consumeString(pLocale_->monAb_, &mon_))
return false;
break;
case 'B': // month name
if (!consumeString(pLocale_->mon_, &mon_))
return false;
break;
case 'd': // day
if (!consumeInteger1(2, &day_, false))
return false;
break;
case 'a': // abbreviated day of week
if (!consumeString(pLocale_->dayAb_, &day_))
return false;
break;
case 'e': // day with optional leading space
if (!consumeInteger1WithSpace(2, &day_))
return false;
break;
case 'H': // hour
if (!consumeInteger(2, &hour_, false))
return false;
break;
case 'I': // hour
if (!consumeInteger(2, &hour_, false))
return false;
if (hour_ < 1 || hour_ > 12) {
return false;
}
hour_ %= 12;
break;
case 'M': // minute
if (!consumeInteger(2, &min_))
return false;
break;
case 'S': // seconds (integer)
if (!consumeSeconds(&sec_, NULL))
return false;
break;
case 'O': // seconds (double)
if (formatItr + 1 == formatEnd || *(formatItr + 1) != 'S')
Rcpp::stop("Invalid format: %%O must be followed by %%S");
formatItr++;
if (!consumeSeconds(&sec_, &psec_))
return false;
break;
case 'p': // AM/PM
if (!consumeString(pLocale_->amPm_, &amPm_))
return false;
break;
case 'z': // time zone specification
tz_ = "UTC";
if (!consumeTzOffset(&tzOffsetHours_, &tzOffsetMinutes_))
return false;
break;
case 'Z': // time zone name
if (!consumeTzName(&tz_))
return false;
break;
// Extensions
case '.':
if (!consumeNonDigit())
return false;
break;
case '+':
if (!consumeNonDigits())
return false;
break;
case '*':
consumeNonDigits();
break;
case 'A': // auto date / time
if (formatItr + 1 == formatEnd)
Rcpp::stop("Invalid format: %%A must be followed by another letter");
formatItr++;
switch (*formatItr) {
case 'D':
if (!parseDate())
return false;
break;
case 'T':
if (!parseTime())
return false;
break;
default:
Rcpp::stop("Invalid %%A auto parser");
}
break;
// Compound formats
case 'D':
parse("%m/%d/%y");
break;
case 'F':
parse("%Y-%m-%d");
break;
case 'R':
parse("%H:%M");
break;
case 'X':
case 'T':
parse("%H:%M:%S");
break;
case 'x':
parse("%y/%m/%d");
break;
default:
Rcpp::stop("Unsupported format %%%s", *formatItr);
}
}
consumeWhiteSpace(); // always consume trailing whitespace
return isComplete();
}
DateTime makeDateTime() {
DateTime dt(year_, mon_, day_, hour(), min_, sec_, psec_, tz_);
if (tz_ == "UTC")
dt.setOffset(-tzOffsetHours_ * 3600 - tzOffsetMinutes_ * 60);
return dt;
}
DateTime makeDate() {
DateTime dt(year_, mon_, day_, 0, 0, 0, 0, "UTC");
return dt;
}
DateTime makeTime() {
DateTime dt(0, 0, 0, hour(), min_, sec_, psec_, "UTC");
return dt;
}
bool compactDate() { return compactDate_; }
int year() { return year_; }
private:
int hour() {
if (hour_ == 12) {
// 12 AM
if (amPm_ == 0) {
return hour_ - 12;
}
// 12 PM
return hour_;
}
// Rest of PM
if (amPm_ == 1) {
return hour_ + 12;
}
// 24 hour time
return hour_;
}
inline bool consumeSeconds(int* pSec, double* pPartialSec) {
double sec;
if (!consumeDouble(&sec))
return false;
*pSec = (int)sec;
if (pPartialSec != NULL)
*pPartialSec = sec - *pSec;
return true;
}
inline bool
consumeString(const std::vector<std::string>& haystack, int* pOut) {
// haystack is always in UTF-8
std::string needleUTF8 = pLocale_->encoder_.makeString(dateItr_, dateEnd_);
for (size_t i = 0; i < haystack.size(); ++i) {
if (boost::istarts_with(needleUTF8, haystack[i])) {
*pOut = i;
dateItr_ += haystack[i].size();
return true;
}
}
return false;
}
inline bool consumeInteger(int n, int* pOut, bool exact = true) {
if (dateItr_ == dateEnd_ || *dateItr_ == '-' || *dateItr_ == '+')
return false;
const char* start = dateItr_;
const char* end = std::min(dateItr_ + n, dateEnd_);
bool ok = parseInt(dateItr_, end, *pOut);
return ok && (!exact || (dateItr_ - start) == n);
}
// Integer indexed from 1 (i.e. month and date)
inline bool consumeInteger1(int n, int* pOut, bool exact = true) {
if (!consumeInteger(n, pOut, exact))
return false;
(*pOut)--;
return true;
}
// Integer indexed from 1 with optional space
inline bool consumeInteger1WithSpace(int n, int* pOut) {
if (consumeThisChar(' '))
n--;
return consumeInteger1(n, pOut);
}
inline bool consumeDouble(double* pOut) {
if (dateItr_ == dateEnd_ || *dateItr_ == '-' || *dateItr_ == '+')
return false;
return parseDouble(pLocale_->decimalMark_, dateItr_, dateEnd_, *pOut);
}
inline bool consumeWhiteSpace() {
while (dateItr_ != dateEnd_ && std::isspace(*dateItr_))
dateItr_++;
return true;
}
inline bool consumeNonDigit() {
if (dateItr_ == dateEnd_ || std::isdigit(*dateItr_))
return false;
dateItr_++;
return true;
}
inline bool consumeNonDigits() {
if (!consumeNonDigit())
return false;
while (dateItr_ != dateEnd_ && !std::isdigit(*dateItr_))
dateItr_++;
return true;
}
inline bool consumeChar(char* pOut) {
if (dateItr_ == dateEnd_)
return false;
*pOut = *dateItr_++;
return true;
}
inline bool consumeThisChar(char needed) {
if (dateItr_ == dateEnd_ || *dateItr_ != needed)
return false;
dateItr_++;
return true;
}
inline bool consumeAMPM(bool* pIsPM) {
if (dateItr_ == dateEnd_)
return false;
if (consumeThisChar('A') || consumeThisChar('a')) {
*pIsPM = false;
} else if (consumeThisChar('P') || consumeThisChar('p')) {
*pIsPM = true;
} else {
return false;
}
if (!(consumeThisChar('M') || consumeThisChar('m')))
return false;
return true;
}
// ISO8601 style
// Z
// ±hh:mm
// ±hhmm
// ±hh
inline bool consumeTzOffset(int* pHours, int* pMinutes) {
if (consumeThisChar('Z'))
return true;
// Optional +/- (required for ISO8601 but we'll let it slide)
int mult = 1;
if (*dateItr_ == '+' || *dateItr_ == '-') {
mult = (*dateItr_ == '-') ? -1 : 1;
dateItr_++;
}
// Required hours
if (!consumeInteger(2, pHours))
return false;
// Optional colon and minutes
consumeThisChar(':');
consumeInteger(2, pMinutes);
*pHours *= mult;
*pMinutes *= mult;
return true;
}
inline bool consumeTzName(std::string* pOut) {
const char* tzStart = dateItr_;
while (dateItr_ != dateEnd_ && !std::isspace(*dateItr_))
dateItr_++;
pOut->assign(tzStart, dateItr_);
return tzStart != dateItr_;
}
void reset() {
year_ = -1;
mon_ = 0;
day_ = 0;
hour_ = 0;
min_ = 0;
sec_ = 0;
psec_ = 0;
amPm_ = -1;
compactDate_ = true;
tzOffsetHours_ = 0;
tzOffsetMinutes_ = 0;
tz_ = tzDefault_;
}
};
#endif