Eden Chuang 2638e37728 Bug 1388661 - Support currency validation in PaymentRequet API. r=baku
This patch implements currency validation algorithm according to the spec
    https://w3c.github.io/payment-request/#validity-checkers.

    1. amount.currencySystem must be "urn:iso:std:iso:4217".
    2. amount.currency is valid with following criteria
       1. The currency length must be 3.
       2. The currency contains any character that must be in the range "A" to
          "Z"(U+0041 to U+005A) or the range "a" to "z"(U+0061 to U+007A).

    According to the spec, converting the currency to upper case and save it in
    nsIPaymentRequest.
2017-09-06 14:36:24 +08:00
..