dateparser.js

angular.module('ui.bootstrap.dateparser', [])

.service('uibDateParser', ['$log', '$locale', 'orderByFilter', function($log, $locale, orderByFilter) {
  // Pulled from https://github.com/mbostock/d3/blob/master/src/format/requote.js
  var SPECIAL_CHARACTERS_REGEXP = /[\\\^\$\*\+\?\|\[\]\(\)\.\{\}]/g;

  var localeId;
  var formatCodeToRegex;

  this.init = function() {
    localeId = $locale.id;

    this.parsers = {};

    formatCodeToRegex = [
      {
        key: 'yyyy',
        regex: '\\d{4}',
        apply: function(value) { this.year = +value; }
      },
      {
        key: 'yy',
        regex: '\\d{2}',
        apply: function(value) { this.year = +value + 2000; }
      },
      {
        key: 'y',
        regex: '\\d{1,4}',
        apply: function(value) { this.year = +value; }
      },
      {
        key: 'M!',
        regex: '0?[1-9]|1[0-2]',
        apply: function(value) { this.month = value - 1; }
      },
      {
        key: 'MMMM',
        regex: $locale.DATETIME_FORMATS.MONTH.join('|'),
        apply: function(value) { this.month = $locale.DATETIME_FORMATS.MONTH.indexOf(value); }
      },
      {
        key: 'MMM',
        regex: $locale.DATETIME_FORMATS.SHORTMONTH.join('|'),
        apply: function(value) { this.month = $locale.DATETIME_FORMATS.SHORTMONTH.indexOf(value); }
      },
      {
        key: 'MM',
        regex: '0[1-9]|1[0-2]',
        apply: function(value) { this.month = value - 1; }
      },
      {
        key: 'M',
        regex: '[1-9]|1[0-2]',
        apply: function(value) { this.month = value - 1; }
      },
      {
        key: 'd!',
        regex: '[0-2]?[0-9]{1}|3[0-1]{1}',
        apply: function(value) { this.date = +value; }
      },
      {
        key: 'dd',
        regex: '[0-2][0-9]{1}|3[0-1]{1}',
        apply: function(value) { this.date = +value; }
      },
      {
        key: 'd',
        regex: '[1-2]?[0-9]{1}|3[0-1]{1}',
        apply: function(value) { this.date = +value; }
      },
      {
        key: 'EEEE',
        regex: $locale.DATETIME_FORMATS.DAY.join('|')
      },
      {
        key: 'EEE',
        regex: $locale.DATETIME_FORMATS.SHORTDAY.join('|')
      },
      {
        key: 'HH',
        regex: '(?:0|1)[0-9]|2[0-3]',
        apply: function(value) { this.hours = +value; }
      },
      {
        key: 'hh',
        regex: '0[0-9]|1[0-2]',
        apply: function(value) { this.hours = +value; }
      },
      {
        key: 'H',
        regex: '1?[0-9]|2[0-3]',
        apply: function(value) { this.hours = +value; }
      },
      {
        key: 'h',
        regex: '[0-9]|1[0-2]',
        apply: function(value) { this.hours = +value; }
      },
      {
        key: 'mm',
        regex: '[0-5][0-9]',
        apply: function(value) { this.minutes = +value; }
      },
      {
        key: 'm',
        regex: '[0-9]|[1-5][0-9]',
        apply: function(value) { this.minutes = +value; }
      },
      {
        key: 'sss',
        regex: '[0-9][0-9][0-9]',
        apply: function(value) { this.milliseconds = +value; }
      },
      {
        key: 'ss',
        regex: '[0-5][0-9]',
        apply: function(value) { this.seconds = +value; }
      },
      {
        key: 's',
        regex: '[0-9]|[1-5][0-9]',
        apply: function(value) { this.seconds = +value; }
      },
      {
        key: 'a',
        regex: $locale.DATETIME_FORMATS.AMPMS.join('|'),
        apply: function(value) {
          if (this.hours === 12) {
            this.hours = 0;
          }

          if (value === 'PM') {
            this.hours += 12;
          }
        }
      },
      {
        key: 'Z',
        regex: '[+-]\\d{4}',
        apply: function(value) {
          var matches = value.match(/([+-])(\d{2})(\d{2})/),
            sign = matches[1],
            hours = matches[2],
            minutes = matches[3];
          this.hours += toInt(sign + hours);
          this.minutes += toInt(sign + minutes);
        }
      },
      {
        key: 'ww',
        regex: '[0-4][0-9]|5[0-3]'
      },
      {
        key: 'w',
        regex: '[0-9]|[1-4][0-9]|5[0-3]'
      },
      {
        key: 'GGGG',
        regex: $locale.DATETIME_FORMATS.ERANAMES.join('|').replace(/\s/g, '\\s')
      },
      {
        key: 'GGG',
        regex: $locale.DATETIME_FORMATS.ERAS.join('|')
      },
      {
        key: 'GG',
        regex: $locale.DATETIME_FORMATS.ERAS.join('|')
      },
      {
        key: 'G',
        regex: $locale.DATETIME_FORMATS.ERAS.join('|')
      }
    ];
  };

  this.init();

  function createParser(format) {
    var map = [], regex = format.split('');

    // check for literal values
    var quoteIndex = format.indexOf('`');
    if (quoteIndex > -1) {
      var inLiteral = false;
      format = format.split('');
      for (var i = quoteIndex; i < format.length; i++) {
        if (inLiteral) {
          if (format[i] === '`') {
            if (i + 1 < format.length && format[i + 1] === '\`') { // escaped backtick
              format[i + 1] = '$';
              regex[i + 1] = '';
            } else { // end of literal
              regex[i] = '';
              inLiteral = false;
            }
          }
          format[i] = '$';
        } else {
          if (format[i] === '`') { // start of literal
            format[i] = '$';
            regex[i] = '';
            inLiteral = true;
          }
        }
      }

      format = format.join('');
    }

    angular.forEach(formatCodeToRegex, function(data) {
      var index = format.indexOf(data.key);

      if (index > -1) {
        format = format.split('');

        regex[index] = '(' + data.regex + ')';
        format[index] = '$'; // Custom symbol to define consumed part of format
        for (var i = index + 1, n = index + data.key.length; i < n; i++) {
          regex[i] = '';
          format[i] = '$';
        }
        format = format.join('');

        map.push({
          index: index,
          apply: data.apply,
          matcher: data.regex
        });
      }
    });

    return {
      regex: new RegExp('^' + regex.join('') + '$'),
      map: orderByFilter(map, 'index')
    };
  }

  this.parse = function(input, format, baseDate) {
    if (!angular.isString(input) || !format) {
      return input;
    }

    format = $locale.DATETIME_FORMATS[format] || format;
    format = format.replace(SPECIAL_CHARACTERS_REGEXP, '\\$&');

    if ($locale.id !== localeId) {
      this.init();
    }

    if (!this.parsers[format]) {
      this.parsers[format] = createParser(format);
    }

    var parser = this.parsers[format],
        regex = parser.regex,
        map = parser.map,
        results = input.match(regex),
        tzOffset = false;
    if (results && results.length) {
      var fields, dt;
      if (angular.isDate(baseDate) && !isNaN(baseDate.getTime())) {
        fields = {
          year: baseDate.getFullYear(),
          month: baseDate.getMonth(),
          date: baseDate.getDate(),
          hours: baseDate.getHours(),
          minutes: baseDate.getMinutes(),
          seconds: baseDate.getSeconds(),
          milliseconds: baseDate.getMilliseconds()
        };
      } else {
        if (baseDate) {
          $log.warn('dateparser:', 'baseDate is not a valid date');
        }
        fields = { year: 1900, month: 0, date: 1, hours: 0, minutes: 0, seconds: 0, milliseconds: 0 };
      }

      for (var i = 1, n = results.length; i < n; i++) {
        var mapper = map[i - 1];
        if (mapper.matcher === 'Z') {
          tzOffset = true;
        }

        if (mapper.apply) {
          mapper.apply.call(fields, results[i]);
        }
      }

      var datesetter = tzOffset ? Date.prototype.setUTCFullYear :
        Date.prototype.setFullYear;
      var timesetter = tzOffset ? Date.prototype.setUTCHours :
        Date.prototype.setHours;

      if (isValid(fields.year, fields.month, fields.date)) {
        if (angular.isDate(baseDate) && !isNaN(baseDate.getTime()) && !tzOffset) {
          dt = new Date(baseDate);
          datesetter.call(dt, fields.year, fields.month, fields.date);
          timesetter.call(dt, fields.hours, fields.minutes,
            fields.seconds, fields.milliseconds);
        } else {
          dt = new Date(0);
          datesetter.call(dt, fields.year, fields.month, fields.date);
          timesetter.call(dt, fields.hours || 0, fields.minutes || 0,
            fields.seconds || 0, fields.milliseconds || 0);
        }
      }

      return dt;
    }
  };

  // Check if date is valid for specific month (and year for February).
  // Month: 0 = Jan, 1 = Feb, etc
  function isValid(year, month, date) {
    if (date < 1) {
      return false;
    }

    if (month === 1 && date > 28) {
      return date === 29 && (year % 4 === 0 && year % 100 !== 0 || year % 400 === 0);
    }

    if (month === 3 || month === 5 || month === 8 || month === 10) {
      return date < 31;
    }

    return true;
  }

  function toInt(str) {
    return parseInt(str, 10);
  }
}]);