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Fix cleanISSN

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This commit is contained in:
aurimasv 2013-10-14 23:51:08 -05:00
parent db43af33ac
commit 3ad2b4924d
1 changed files with 3 additions and 3 deletions
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6
chrome/content/zotero/xpcom/utilities.js
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@ -314,18 +314,18 @@ Zotero.Utilities = {
*/
"cleanISSN":function(/**String*/ issn) {
issn = issn.replace(/[^0-9a-z]+/ig, '').toUpperCase() //we only want to ignore punctuation, spaces
.match(/[0-9]{7}[0-9X]/); //13 digit or 10 digit
.match(/[0-9]{7}[0-9X]/);
if(!issn) return false;
issn = issn[0];
// Verify ISBN-10 checksum
// Verify ISSN checksum
var sum = 0;
for (var i = 0; i < 7; i++) {
if(issn[i] == 'X') return false; //X can only be a check digit
sum += issn[i] * (8-i);
}
//check digit might be 'X'
sum += (issn[9] == 'X')? 10 : issn[9]*1;
sum += (issn[7] == 'X')? 10 : issn[7]*1;
return (sum % 11 == 0) ? issn.substring(0,4) + '-' + issn.substring(4) : false;
},