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/*
 * Código de identificación fiscal ( CIF ) is the tax identification code for Spanish legal entities
 * Further rules can be found in Spanish on http://es.wikipedia.org/wiki/C%C3%B3digo_de_identificaci%C3%B3n_fiscal
 *
 * Spanish CIF structure:
 *
 * [ T ][ P ][ P ][ N ][ N ][ N ][ N ][ N ][ C ]
 *
 * Where:
 *
 * T: 1 character. Kind of Organization Letter: [ABCDEFGHJKLMNPQRSUVW]
 * P: 2 characters. Province.
 * N: 5 characters. Secuencial Number within the province.
 * C: 1 character. Control Digit: [0-9A-J].
 *
 * [ T ]: Kind of Organizations. Possible values:
 *
 *   A. Corporations
 *   B. LLCs
 *   C. General partnerships
 *   D. Companies limited partnerships
 *   E. Communities of goods
 *   F. Cooperative Societies
 *   G. Associations
 *   H. Communities of homeowners in horizontal property regime
 *   J. Civil Societies
 *   K. Old format
 *   L. Old format
 *   M. Old format
 *   N. Nonresident entities
 *   P. Local authorities
 *   Q. Autonomous bodies, state or not, and the like, and congregations and religious institutions
 *   R. Congregations and religious institutions (since 2008 ORDER EHA/451/2008)
 *   S. Organs of State Administration and regions
 *   V. Agrarian Transformation
 *   W. Permanent establishments of non-resident in Spain
 *
 * [ C ]: Control Digit. It can be a number or a letter depending on T value:
 * [ T ]  -->  [ C ]
 * ------    ----------
 *   A         Number
 *   B         Number
 *   E         Number
 *   H         Number
 *   K         Letter
 *   P         Letter
 *   Q         Letter
 *   S         Letter
 *
 */
$.validator.addMethod( "cifES", function( value ) {
	"use strict";

	var cifRegEx = new RegExp( /^([ABCDEFGHJKLMNPQRSUVW])(\d{7})([0-9A-J])$/gi );
	var letter  = value.substring( 0, 1 ), // [ T ]
		number  = value.substring( 1, 8 ), // [ P ][ P ][ N ][ N ][ N ][ N ][ N ]
		control = value.substring( 8, 9 ), // [ C ]
		all_sum = 0,
		even_sum = 0,
		odd_sum = 0,
		i, n,
		control_digit,
		control_letter;

	function isOdd( n ) {
		return n % 2 === 0;
	}

	// Quick format test
	if ( value.length !== 9 || !cifRegEx.test( value ) ) {
		return false;
	}

	for ( i = 0; i < number.length; i++ ) {
		n = parseInt( number[ i ], 10 );

		// Odd positions
		if ( isOdd( i ) ) {

			// Odd positions are multiplied first.
			n *= 2;

			// If the multiplication is bigger than 10 we need to adjust
			odd_sum += n < 10 ? n : n - 9;

		// Even positions
		// Just sum them
		} else {
			even_sum += n;
		}
	}

	all_sum = even_sum + odd_sum;
	control_digit = ( 10 - ( all_sum ).toString().substr( -1 ) ).toString();
	control_digit = parseInt( control_digit, 10 ) > 9 ? "0" : control_digit;
	control_letter = "JABCDEFGHI".substr( control_digit, 1 ).toString();

	// Control must be a digit
	if ( letter.match( /[ABEH]/ ) ) {
		return control === control_digit;

	// Control must be a letter
	} else if ( letter.match( /[KPQS]/ ) ) {
		return control === control_letter;

	// Can be either
	} else {
		return control === control_digit || control === control_letter;
	}

	return false;

}, "Please specify a valid CIF number." );