View: strptime

Function:
Description: Parse a time/date generated with strftime().
Code
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function strptime (dateStr, format) {
    // http://jsphp.co/jsphp/fn/view/strptime
    // +      original by: Brett Zamir (http://brett-zamir.me)
    // +      based on: strftime
    // -       depends on: setlocale
    // -       depends on: array_map
    // *        example 1: strptime('20091112222135', '%Y%m%d%H%M%S'); // Return value will depend on date and locale
    // *        returns 1: {tm_sec: 35, tm_min: 21, tm_hour: 22, tm_mday: 12, tm_mon: 10, tm_year: 109, tm_wday: 4, tm_yday: 315, unparsed: ''}
    // *        example 1: strptime('2009extra', '%Y');
    // *        returns 1: {tm_sec:0, tm_min:0, tm_hour:0, tm_mday:0, tm_mon:0, tm_year:109, tm_wday:3, tm_yday: -1, unparsed: 'extra'}

    // tm_isdst is in other docs; why not PHP?

    // Needs more thorough testing and examples

    var retObj = {
        tm_sec: 0,
        tm_min: 0,
        tm_hour: 0,
        tm_mday: 0,
        tm_mon: 0,
        tm_year: 0,
        tm_wday: 0,
        tm_yday: 0,
        unparsed: ''
    },
        that = this,
        amPmOffset = 0,
        prevHour = false,
        _date = function () {
            var o = retObj;
            // We set date to at least 1 to ensure year or month doesn't go backwards
            return _reset(new Date(Date.UTC(o.tm_year + 1900, o.tm_mon, o.tm_mday || 1, o.tm_hour, o.tm_min, o.tm_sec)), o.tm_mday);
        },
        _reset = function (dateObj, realMday) {
            // realMday is to allow for a value of 0 in return results (but without
            // messing up the Date() object)
            var o = retObj;
            var d = dateObj;
            o.tm_sec = d.getUTCSeconds();
            o.tm_min = d.getUTCMinutes();
            o.tm_hour = d.getUTCHours();
            o.tm_mday = realMday === 0 ? realMday : d.getUTCDate();
            o.tm_mon = d.getUTCMonth();
            o.tm_year = d.getUTCFullYear() - 1900;
            o.tm_wday = realMday === 0 ? (d.getUTCDay() > 0 ? d.getUTCDay() - 1 : 6) : d.getUTCDay();
            var jan1 = new Date(Date.UTC(d.getUTCFullYear(), 0, 1));
            o.tm_yday = Math.ceil((d - jan1) / (1000 * 60 * 60 * 24));
        };

    // BEGIN STATIC
    var _NWS = /\S/,
        _WS = /\s/;

    var _aggregates = {
        c: 'locale',
        D: '%m/%d/%y',
        F: '%y-%m-%d',
        r: 'locale',
        R: '%H:%M',
        T: '%H:%M:%S',
        x: 'locale',
        X: 'locale'
    };

/* Fix: Locale alternatives are supported though not documented in PHP; see http://linux.die.net/man/3/strptime
Ec
EC
Ex
EX
Ey
EY
Od or Oe
OH
OI
Om
OM
OS
OU
Ow
OW
Oy
*/
    var _preg_quote = function (str) {
        return (str + '').replace(/([\\\.\+\*\?\[\^\]\$\(\)\{\}\=\!<>\|\:])/g, '\\$1');
    };
    // END STATIC

    // BEGIN REDUNDANT
    this.php_js = this.php_js || {};
    this.setlocale('LC_ALL', 0); // ensure setup of localization variables takes place
    // END REDUNDANT

    var phpjs = this.php_js;
    var locale = phpjs.localeCategories.LC_TIME;
    var locales = phpjs.locales;
    var lc_time = locales[locale].LC_TIME;

    // First replace aggregates (run in a loop because an agg may be made up of other aggs)
    while (format.match(/%[cDFhnrRtTxX]/)) {
        format = format.replace(/%([cDFhnrRtTxX])/g, function (m0, m1) {
            var f = _aggregates[m1];
            return (f === 'locale' ? lc_time[m1] : f);
        });
    }

    var _addNext = function (j, regex, cb) {
        if (typeof regex === 'string') {
            regex = new RegExp('^' + regex, 'i');
        }
        var check = dateStr.slice(j);
        var match = regex.exec(check);
        // Even if the callback returns null after assigning to the return object, the object won't be saved anyways
        var testNull = match ? cb.apply(null, match) : null;
        if (testNull === null) {
            throw 'No match in string';
        }
        return j + match[0].length;
    };

    var _addLocalized = function (j, formatChar, category) {
        return _addNext(j, that.array_map(
        _preg_quote, lc_time[formatChar]).join('|'), // Could make each parenthesized instead and pass index to callback

        function (m) {
            var match = lc_time[formatChar].search(new RegExp('^' + _preg_quote(m) + '$', 'i'));
            if (match) {
                retObj[category] = match[0];
            }
        });
    };

    // BEGIN PROCESSING CHARACTERS
    for (var i = 0, j = 0; i < format.length; i++) {
        if (format.charAt(i) === '%') {
            var literalPos = ['%', 'n', 't'].indexOf(format.charAt(i + 1));
            if (literalPos !== -1) {
                if (['%', '\n', '\t'].indexOf(dateStr.charAt(j)) === literalPos) { // a matched literal
                    ++i, ++j; // skip beyond
                    continue;
                }
                // Format indicated a percent literal, but not actually present
                return false;
            }
            var formatChar = format.charAt(i + 1);
            try {
                switch (formatChar) {
                case 'a':
                    // Fall-through // Sun-Sat
                case 'A':
                    // Sunday-Saturday
                    j = _addLocalized(j, formatChar, 'tm_wday'); // Changes nothing else
                    break;
                case 'h':
                    // Fall-through (alias of 'b');
                case 'b':
                    // Jan-Dec
                    j = _addLocalized(j, 'b', 'tm_mon');
                    _date(); // Also changes wday, yday
                    break;
                case 'B':
                    // January-December
                    j = _addLocalized(j, formatChar, 'tm_mon');
                    _date(); // Also changes wday, yday
                    break;
                case 'C':
                    // 0+; century (19 for 20th)
                    j = _addNext(j, /^\d?\d/, // PHP docs say two-digit, but accepts one-digit (two-digit max)

                    function (d) {
                        var year = (parseInt(d, 10) - 19) * 100;
                        retObj.tm_year = year;
                        _date();
                        if (!retObj.tm_yday) {
                            retObj.tm_yday = -1;
                        }
                        // Also changes wday; and sets yday to -1 (always?)
                    });
                    break;
                case 'd':
                    // Fall-through  01-31 day
                case 'e':
                    // 1-31 day
                    j = _addNext(j, formatChar === 'd' ? /^(0[1-9]|[1-2]\d|3[0-1])/ : /^([1-2]\d|3[0-1]|[1-9])/, function (d) {
                        var dayMonth = parseInt(d, 10);
                        retObj.tm_mday = dayMonth;
                        _date(); // Also changes w_day, y_day
                    });
                    break;
                case 'g':
                    // No apparent effect; 2-digit year (see 'V')
                    break;
                case 'G':
                    // No apparent effect; 4-digit year (see 'V')'
                    break;
                case 'H':
                    // 00-23 hours
                    j = _addNext(j, /^([0-1]\d|2[0-3])/, function (d) {
                        var hour = parseInt(d, 10);
                        retObj.tm_hour = hour;
                        // Changes nothing else
                    });
                    break;
                case 'l':
                    // Fall-through of lower-case 'L'; 1-12 hours
                case 'I':
                    // 01-12 hours
                    j = _addNext(j, formatChar === 'l' ? /^([1-9]|1[0-2])/ : /^(0[1-9]|1[0-2])/, function (d) {
                        var hour = parseInt(d, 10) - 1 + amPmOffset;
                        retObj.tm_hour = hour;
                        prevHour = true; // Used for coordinating with am-pm
                        // Changes nothing else, but affected by prior 'p/P'
                    });
                    break;
                case 'j':
                    // 001-366 day of year
                    j = _addNext(j, /^(00[1-9]|0[1-9]\d|[1-2]\d\d|3[0-6][0-6])/, function (d) {
                        var dayYear = parseInt(d, 10) - 1;
                        retObj.tm_yday = dayYear;
                        // Changes nothing else (oddly, since if based on a given year, could calculate other fields)
                    });
                    break;
                case 'm':
                    // 01-12 month
                    j = _addNext(j, /^(0[1-9]|1[0-2])/, function (d) {
                        var month = parseInt(d, 10) - 1;
                        retObj.tm_mon = month;
                        _date(); // Also sets wday and yday
                    });
                    break;
                case 'M':
                    // 00-59 minutes
                    j = _addNext(j, /^[0-5]\d/, function (d) {
                        var minute = parseInt(d, 10);
                        retObj.tm_min = minute;
                        // Changes nothing else
                    });
                    break;
                case 'P':
                    // Seems not to work; AM-PM
                    return false; // Could make fall-through instead since supposed to be a synonym despite PHP docs
                case 'p':
                    // am-pm
                    j = _addNext(j, /^(am|pm)/i, function (d) {
                        // No effect on 'H' since already 24 hours but
                        //   works before or after setting of l/I hour
                        amPmOffset = (/a/).test(d) ? 0 : 12;
                        if (prevHour) {
                            retObj.tm_hour += amPmOffset;
                        }
                    });
                    break;
                case 's':
                    // Unix timestamp (in seconds)
                    j = _addNext(j, /^\d+/, function (d) {
                        var timestamp = parseInt(d, 10);
                        var date = new Date(Date.UTC(timestamp * 1000));
                        _reset(date);
                        // Affects all fields, but can't be negative (and initial + not allowed)
                    });
                    break;
                case 'S':
                    // 00-59 seconds
                    j = _addNext(j, /^[0-5]\d/, // strptime also accepts 60-61 for some reason

                    function (d) {
                        var second = parseInt(d, 10);
                        retObj.tm_sec = second;
                        // Changes nothing else
                    });
                    break;
                case 'u':
                    // Fall-through; 1 (Monday)-7(Sunday)
                case 'w':
                    // 0 (Sunday)-6(Saturday)
                    j = _addNext(j, /^\d/, function (d) {
                        retObj.tm_wday = d - (formatChar === 'u');
                        // Changes nothing else apparently
                    });
                    break;
                case 'U':
                    // Fall-through (week of year, from 1st Sunday)
                case 'V':
                    // Fall-through (ISO-8601:1988 week number; from first 4-weekday week, starting with Monday)
                case 'W':
                    // Apparently ignored (week of year, from 1st Monday)
                    break;
                case 'y':
                    // 69 (or higher) for 1969+, 68 (or lower) for 2068-
                    j = _addNext(j, /^\d?\d/, // PHP docs say two-digit, but accepts one-digit (two-digit max)

                    function (d) {
                        d = parseInt(d, 10);
                        var year = d >= 69 ? d : d + 100;
                        retObj.tm_year = year;
                        _date();
                        if (!retObj.tm_yday) {
                            retObj.tm_yday = -1;
                        }
                        // Also changes wday; and sets yday to -1 (always?)
                    });
                    break;
                case 'Y':
                    // 2010 (4-digit year)
                    j = _addNext(j, /^\d{1,4}/, // PHP docs say four-digit, but accepts one-digit (four-digit max)

                    function (d) {
                        var year = (parseInt(d, 10)) - 1900;
                        retObj.tm_year = year;
                        _date();
                        if (!retObj.tm_yday) {
                            retObj.tm_yday = -1;
                        }
                        // Also changes wday; and sets yday to -1 (always?)
                    });
                    break;
                case 'z':
                    // Timezone; on my system, strftime gives -0800, but strptime seems not to alter hour setting
                    break;
                case 'Z':
                    // Timezone; on my system, strftime gives PST, but strptime treats text as unparsed
                    break;
                default:
                    throw 'Unrecognized formatting character in strptime()';
                    break;
                }
            } catch (e) {
                if (e === 'No match in string') { // Allow us to exit
                    return false; // There was supposed to be a matching format but there wasn't
                }
            }++i; // Calculate skipping beyond initial percent too
        } else if (format.charAt(i) !== dateStr.charAt(j)) {
            // If extra whitespace at beginning or end of either, or between formats, no problem
            // (just a problem when between % and format specifier)

            // If the string has white-space, it is ok to ignore
            if (dateStr.charAt(j).search(_WS) !== -1) {
                j++;
                i--; // Let the next iteration try again with the same format character
            } else if (format.charAt(i).search(_NWS) !== -1) { // Any extra formatting characters besides white-space causes 
                // problems (do check after WS though, as may just be WS in string before next character)
                return false;
            } else { // Extra WS in format
                // Adjust strings when encounter non-matching whitespace, so they align in future checks above
                // Will check on next iteration (against same (non-WS) string character)
            }
        } else {
            j++;
        }
    }

    // POST-PROCESSING
    retObj.unparsed = dateStr.slice(j); // Will also get extra whitespace; empty string if none
    return retObj;
}
Comment on strptime version 125
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