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Add support for mixed operands to divide().

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This commit is contained in:
Stefan Thomas
2012-12-10 15:07:02 -08:00
parent 0436928249
commit 2ce23c45b2
2 changed files with 90 additions and 61 deletions
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109
src/js/amount.js
View File

@@ -610,10 +610,7 @@ Amount.prototype.compareTo = function (v) {
Amount.prototype.copyTo = function (d, negate) { Amount.prototype.copyTo = function (d, negate) {
if ('object' === typeof this._value) if ('object' === typeof this._value)
{ {
if (this._is_native && negate) this._value.copyTo(d._value);
this._value.negate().copyTo(d._value);
else
this._value.copyTo(d._value);
} }
else else
{ {
@@ -622,9 +619,7 @@ Amount.prototype.copyTo = function (d, negate) {
d._offset = this._offset; d._offset = this._offset;
d._is_native = this._is_native; d._is_native = this._is_native;
d._is_negative = this._is_native d._is_negative = negate
? undefined // Native sign in BigInteger.
: negate
? !this._is_negative // Negating. ? !this._is_negative // Negating.
: this._is_negative; // Just copying. : this._is_negative; // Just copying.
@@ -657,63 +652,58 @@ Amount.prototype.equals = function (d) {
// Result in terms of this' currency and issuer. // Result in terms of this' currency and issuer.
Amount.prototype.divide = function (d) { Amount.prototype.divide = function (d) {
var result; var result, vn, on, vd, od;
if (!this.is_comparable(d)) { if (d.is_zero()) {
// XXX We might want to allow mixed division. In that case convert d to same terms as this.
result = Amount.NaN();
}
else if (d.is_zero()) {
throw "divide by zero"; throw "divide by zero";
} }
else if (this.is_zero()) { else if (this.is_zero()) {
result = this; result = this.clone();
} }
else if (this._is_native) { else if (!this.is_valid()) {
var vn = this._value; throw new Error("Invalid dividend");
var on = this._offset;
var vd = d._value;
var od = d._offset;
while (vn.compareTo(consts.bi_man_min_value) < 0) {
vn = vn.multiply(consts.bi_10);
on -= 1;
}
while (dn.compareTo(consts.bi_man_min_value) < 0) {
vd = vn.multiply(consts.bi_10);
od -= 1;
}
result = new Amount();
result._value = vn.multiply(consts.bi_1e16).divide(vd);
if (this._is_negative != d._is_negative)
result._value = result._value.negate();
// XXX Check range?
} }
else { else if (!d.is_valid()) {
var vn = this._value.multiply(consts.bi_10).add(3); throw new Error("Invalid divisor");
var on = this._offset - 1;
var vd = d._value.multiply(consts.bi_10).add(3);
var od = d._offset - 1;
result = new Amount();
result._offset = on+od-16;
result._value = vn.multiply(consts.bi_1e16).divide(vd);
result._is_negative = this._is_negative != d._is_negative;
result._currency = this._currency.clone();
result._issuer = this._issuer.clone();
if (result._offset > cMaxOffset || result._offset < cMaxOffset)
throw "division result out of range.";
// XXX Check value is in legal range here or have canonicalize do it?
result.canonicalize();
} }
if (this._is_native) {
vn = this._value.multiply(consts.bi_1e16);
on = 0 - 16;
} else {
vn = this._value.multiply(consts.bi_1e16);
on = this._offset - 16;
}
if (d._is_native) {
vd = d._value;
od = 0;
} else {
vd = d._value;
od = d._offset;
}
result = new Amount();
result._offset = on-od;
result._value = vn.divide(vd).abs();
result._is_native = this._is_native;
result._is_negative = !!this._is_negative !== !!d._is_negative;
result._currency = this._currency.clone();
result._issuer = this._issuer.clone();
if (result._is_native) {
// For native results, we need to manually normalize
result._value = result._value.divide(consts.bi_10.pow(result._offset+4));
result._offset = undefined;
}
//if (result._offset > consts.cMaxOffset || result._offset < consts.cMaxOffset)
// throw new Error("division result out of range.");
// XXX Check value is in legal range here or have canonicalize do it?
result.canonicalize();
return result; return result;
}; };
@@ -919,12 +909,9 @@ Amount.prototype.parse_native = function (j) {
this._value = int_part.add(fraction_part); this._value = int_part.add(fraction_part);
} }
if (m[1])
this._value = this._value.negate();
this._is_native = true; this._is_native = true;
this._offset = undefined; this._offset = undefined;
this._is_negative = undefined; this._is_negative = !!m[1] && this._value.compareTo(BigInteger.ZERO) !== 0;
if (this._value.compareTo(consts.bi_xns_max) > 0 || this._value.compareTo(consts.bi_xns_min) < 0) if (this._value.compareTo(consts.bi_xns_max) > 0 || this._value.compareTo(consts.bi_xns_min) < 0)
{ {
@@ -1049,7 +1036,7 @@ Amount.prototype.to_text = function (allow_nan) {
} }
else else
{ {
return this._value.toString(); return (this._is_negative ? "-" : "") + this._value.toString();
} }
} }
else if (this.is_zero()) else if (this.is_zero())

42
test/amount-test.js
View File

@@ -104,6 +104,48 @@ buster.testCase("Amount", {
"Clone non-native -123" : function () { "Clone non-native -123" : function () {
buster.assert.equals("-123/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh", Amount.from_json("-123/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh").clone().to_text_full()); buster.assert.equals("-123/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh", Amount.from_json("-123/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh").clone().to_text_full());
}, },
"Divide XRP by USD" : function () {
buster.assert.equals("20/XRP", Amount.from_json("200").divide(Amount.from_json("10/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh")).to_text_full());
},
"Divide XRP by USD" : function () {
buster.assert.equals("2000/XRP", Amount.from_json("20000").divide(Amount.from_json("10/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh")).to_text_full());
},
"Divide XRP by USD" : function () {
buster.assert.equals("200000/XRP", Amount.from_json("2000000").divide(Amount.from_json("10/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh")).to_text_full());
},
"Divide XRP by USD, neg" : function () {
buster.assert.equals("-20/XRP", Amount.from_json("200").divide(Amount.from_json("-10/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh")).to_text_full());
},
"Divide XRP by USD, neg, frac" : function () {
buster.assert.equals("-162/XRP", Amount.from_json("-6000").divide(Amount.from_json("37/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh")).to_text_full());
},
"Divide USD by USD" : function () {
buster.assert.equals("200/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh", Amount.from_json("2000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh").divide(Amount.from_json("10/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh")).to_text_full());
},
"Divide USD by USD, fractional" : function () {
buster.assert.equals("57142.85714285714/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh", Amount.from_json("2000000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh").divide(Amount.from_json("35/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh")).to_text_full());
},
"Divide USD by USD" : function () {
buster.assert.equals("20/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh", Amount.from_json("2000000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh").divide(Amount.from_json("100000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh")).to_text_full());
},
"Divide EUR by USD, result < 1" : function () {
buster.assert.equals("0.1/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh", Amount.from_json("100/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh").divide(Amount.from_json("1000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh")).to_text_full());
},
"Divide EUR by USD, neg" : function () {
buster.assert.equals("-12/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh", Amount.from_json("-24000/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh").divide(Amount.from_json("2000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh")).to_text_full());
},
"Divide EUR by USD, neg, <1" : function () {
buster.assert.equals("-0.1/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh", Amount.from_json("100/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh").divide(Amount.from_json("-1000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh")).to_text_full());
},
"Divide EUR by XRP, result < 1" : function () {
buster.assert.equals("0.05/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh", Amount.from_json("100/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh").divide(Amount.from_json("2000")).to_text_full());
},
"Divide EUR by XRP, neg" : function () {
buster.assert.equals("-20/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh", Amount.from_json("-100/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh").divide(Amount.from_json("5")).to_text_full());
},
"Divide EUR by XRP, neg, <1" : function () {
buster.assert.equals("-0.05/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh", Amount.from_json("-100/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh").divide(Amount.from_json("2000")).to_text_full());
}
} }
}); });