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Added parsing function for parsing human-entered amount.

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Stefan Thomas
2012-11-26 14:26:54 -08:00
parent 1c09b9ceaa
commit e8d357b6cd
1 changed files with 65 additions and 0 deletions
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65
src/js/amount.js
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@@ -344,6 +344,10 @@ Amount.from_json = function(j) {
return (new Amount()).parse_json(j);
};
Amount.from_human = function(j) {
return (new Amount()).parse_human(j);
};
Amount.is_valid = function (j) {
return Amount.from_json(j).is_valid();
};
@@ -546,6 +550,67 @@ Amount.prototype.to_text_full = function() {
: this.to_text() + "/" + this._currency.to_json() + "/" + this._issuer.to_json();
};
/**
* Tries to correctly interpret an amount as entered by a user.
*
* Examples:
*
* XRP 250 => 250000000/XRP
* 25.2 XRP => 25200000/XRP
* USD 100.40 => 100.4/USD/?
* 100 => 100000000/XRP
*/
Amount.prototype.parse_human = function(j) {
// Cast to string
j = ""+j;
// Parse
var m = j.match(/^\s*([a-z]{3})?\s*(-)?(\d+)(?:\.(\d*))?\s*([a-z]{3})?\s*$/i);
if (m) {
var currency = m[1] || m[5] || "XRP",
integer = m[3] || "0",
fraction = m[4] || "",
precision = null;
currency = currency.toUpperCase();
this._value = new BigInteger(integer);
this.set_currency(currency);
// XRP have exactly six digits of precision
if (currency === 'XRP') {
fraction = fraction.slice(0, 6);
while (fraction.length < 6) {
fraction += "0";
}
this._is_native = true;
this._value = this._value.multiply(consts.bi_xns_unit).add(new BigInteger(fraction));
}
// Other currencies have arbitrary precision
else {
while (fraction[fraction.length - 1] === "0") {
fraction = fraction.slice(0, fraction.length - 1);
}
precision = fraction.length;
this._is_native = false;
var multiplier = consts.bi_10.clone().pow(precision);
this._value = this._value.multiply(multiplier).add(fraction);
this._offset = -precision;
this.canonicalize();
}
this._is_negative = !!m[2];
} else {
this._value = NaN;
}
return this;
};
// Parse a XRP value from untrusted input.
// - integer = raw units
// - float = with precision 6