D-Net

export class Dates {

  public static isValidYear(yearString){

    // First check for the pattern

    if(!/^\d{4}$/.test(yearString))

        return false;

        var year = parseInt(yearString, 10);

        // Check the ranges of month and year

        if(year < 1000 || year > 3000 )

            return false;

        return true;

  }

  //format YYYY-MM-DD

  public static isValidDate(dateString)

  {

      // First check for the pattern

      if(!/^\d{4}\-\d{1,2}\-\d{1,2}$/.test(dateString))

          return false;

      // Parse the date parts to integers

      var parts = dateString.split("-");

      var day = parseInt(parts[2], 10);

      var month = parseInt(parts[1], 10);

       var year = parseInt(parts[0], 10);

      if(!this.isValidYear(parts[0])){

        return false;

      }

      // Check the ranges of month and year

      if( month == 0 || month > 12)

          return false;

      var monthLength = [ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 ];

      // Adjust for leap years

      if(year % 400 == 0 || (year % 100 != 0 && year % 4 == 0))

          monthLength[1] = 29;

      // Check the range of the day

      return day > 0 && day <= monthLength[month - 1];

  }

  public static getDateToday(){

    var myDate = new Date();

    return myDate.getFullYear()+ "-" +(myDate.getMonth() + 1) + "-" + myDate.getDate() ;

  }

}

export class DOI{

  public static getDOIsFromString(str:string):string[]{

    var DOIs:string[] = [];

    var words:string[] = str.split(" ");

    for(var i=0; i< words.length; i++){

        if(DOI.isValidDOI(words[i]) && DOIs.indexOf(words[i]) == -1){

          DOIs.push(words[i]);

        }

    }

    return DOIs;

  }

  public static isValidDOI(str:string):boolean{

      var exp1 = /\b(10[.][0-9]{4,}(?:[.][0-9]+)*\/(?:(?!["&\'<>])\S)+)\b/g

      var exp2 = /\b(10[.][0-9]{4,}(?:[.][0-9]+)*\/(?:(?!["&\'<>])[[:graph:]])+)\b/g

      if(str.match(exp1)!=null || str.match(exp2)!=null){

        // console.log("It's a DOI");

        return true;

      }

      return false;

  }

}