text: import {configFromISO} from './from-string';
  import {configFromArray} from './from-array';
  import {getParseRegexForToken} from '../parse/regex';
  import {addTimeToArrayFromToken} from '../parse/token';
  import {expandFormat, formatTokenFunctions, formattingTokens} from '../format/format';
  import checkOverflow from './check-overflow';
  import {HOUR} from '../units/constants';
  import {hooks} from '../utils/hooks';
  import getParsingFlags from './parsing-flags';
  
  // constant that refers to the ISO standard
  hooks.ISO_8601 = function () {
  };
  
  // date from string and format string
  export function configFromStringAndFormat(config) {
      // TODO: Move this to another part of the creation flow to prevent circular deps
      if (config._f === hooks.ISO_8601) {
          configFromISO(config);
          return;
      }
  
      config._a = [];
      getParsingFlags(config).empty = true;
  
      // This array is used to make a Date, either with `new Date` or `Date.UTC`
      var string = '' + config._i,
          i, parsedInput, tokens, token, skipped,
          stringLength = string.length,
          totalParsedInputLength = 0;
  
      tokens = expandFormat(config._f, config._locale).match(formattingTokens) || [];
  
      for (i = 0; i < tokens.length; i++) {
          token = tokens[i];
          parsedInput = (string.match(getParseRegexForToken(token, config)) || [])[0];
          // console.log('token', token, 'parsedInput', parsedInput,
          //         'regex', getParseRegexForToken(token, config));
          if (parsedInput) {
              skipped = string.substr(0, string.indexOf(parsedInput));
              if (skipped.length > 0) {
                  getParsingFlags(config).unusedInput.push(skipped);
              }
              string = string.slice(string.indexOf(parsedInput) + parsedInput.length);
              totalParsedInputLength += parsedInput.length;
          }
          // don't parse if it's not a known token
          if (formatTokenFunctions[token]) {
              if (parsedInput) {
                  getParsingFlags(config).empty = false;
              } else {
                  getParsingFlags(config).unusedTokens.push(token);
              }
              addTimeToArrayFromToken(token, parsedInput, config);
          } else if (config._strict && !parsedInput) {
              getParsingFlags(config).unusedTokens.push(token);
          }
      }
  
      // add remaining unparsed input length to the string
      getParsingFlags(config).charsLeftOver = stringLength - totalParsedInputLength;
      if (string.length > 0) {
          getParsingFlags(config).unusedInput.push(string);
      }
  
      // clear _12h flag if hour is <= 12
      if (getParsingFlags(config).bigHour === true &&
          config._a[HOUR] <= 12 &&
          config._a[HOUR] > 0) {
          getParsingFlags(config).bigHour = undefined;
      }
  
      getParsingFlags(config).parsedDateParts = config._a.slice(0);
      getParsingFlags(config).meridiem = config._meridiem;
      // handle meridiem
      config._a[HOUR] = meridiemFixWrap(config._locale, config._a[HOUR], config._meridiem);
  
      configFromArray(config);
      checkOverflow(config);
  }
  
  
  function meridiemFixWrap(locale, hour, meridiem) {
      var isPm;
  
      if (meridiem == null) {
          // nothing to do
          return hour;
      }
      if (locale.meridiemHour != null) {
          return locale.meridiemHour(hour, meridiem);
      } else if (locale.isPM != null) {
          // Fallback
          isPm = locale.isPM(meridiem);
          if (isPm && hour < 12) {
              hour += 12;
          }
          if (!isPm && hour === 12) {
              hour = 0;
          }
          return hour;
      } else {
          // this is not supposed to happen
          return hour;
      }
  }
  