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Exponential support in DecimalFormat

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This commit is contained in:
Alexey Andreev 2015-06-07 22:58:04 +03:00
parent 27da14d827
commit 999101a608
2 changed files with 50 additions and 20 deletions
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60
teavm-classlib/src/main/java/org/teavm/classlib/java/text/TDecimalFormat.java
View File

@ -225,21 +225,20 @@ public class TDecimalFormat extends TNumberFormat {
int mantissaLength = visibleExponent + 1;
int significantSize = getMinimumIntegerDigits() + getMaximumFractionDigits();
int exponentMultiplier = getMaximumIntegerDigits() - getMinimumIntegerDigits();
if (exponentMultiplier > 0) {
int exponentMultiplier = getMaximumIntegerDigits() - getMinimumIntegerDigits() + 1;
if (exponentMultiplier > 1) {
int delta = exponent - (exponent / exponentMultiplier) * exponentMultiplier;
exponent -= delta;
exponentMultiplier -= delta;
visibleExponent -= delta;
} else {
exponent -= getMinimumIntegerDigits();
visibleExponent -= getMinimumIntegerDigits();
exponent -= getMinimumIntegerDigits() - 1;
visibleExponent -= getMinimumIntegerDigits() - 1;
}
int roundingPos = exponent + getMaximumFractionDigits();
if (roundingPos < 0) {
if (significantSize < 0) {
mantissa = 0;
} else if (roundingPos < mantissaLength) {
mantissa = applyRounding(mantissa, mantissaLength, roundingPos, positive);
} else if (significantSize < mantissaLength) {
mantissa = applyRounding(mantissa, mantissaLength, significantSize, positive);
}
int exponentPos = Math.max(visibleExponent, 0);
@ -248,12 +247,13 @@ public class TDecimalFormat extends TNumberFormat {
buffer.append(Character.forDigit((int)(mantissa / mantissaDigitMask), 10));
mantissa %= mantissaDigitMask;
}
for (int i = exponentPos; i >= visibleExponent; --i) {
for (int i = exponentPos - 1; i >= visibleExponent; --i) {
buffer.append('0');
}
significantSize -= mantissaLength - visibleExponent;
if (getMinimumIntegerDigits() > 0 || (mantissa != 0 && significantSize > 0)) {
int requiredSize = significantSize - (getMaximumFractionDigits() - getMinimumFractionDigits());
if (requiredSize > 0 || (mantissa != 0 && significantSize > 0)) {
buffer.append(symbols.getDecimalSeparator());
int limit = Math.max(0, visibleExponent - significantSize);
@ -262,12 +262,12 @@ public class TDecimalFormat extends TNumberFormat {
long mantissaDigitMask = POW10_ARRAY[i];
buffer.append(Character.forDigit((int)(mantissa / mantissaDigitMask), 10));
mantissa %= mantissaDigitMask;
++count;
if (mantissa == 0) {
break;
}
++count;
}
while (count-- < getMinimumFractionDigits()) {
while (count++ < requiredSize) {
buffer.append('0');
}
}
@ -277,12 +277,19 @@ public class TDecimalFormat extends TNumberFormat {
exponent = -exponent;
buffer.append(symbols.getMinusSign());
}
int exponentLength = Math.max(exponentDigits, fastLn10(exponent));
int exponentLength = Math.max(exponentDigits, fastLn10(exponent) + 1);
for (int i = exponentLength - 1; i >= 0; --i) {
int exponentDigit = POW10_INT_ARRAY[i];
buffer.append(Character.forDigit(exponent / exponentDigit, 10));
exponent %= exponentDigit;
}
// Add suffix
if (positive) {
buffer.append(positiveSuffix != null ? positiveSuffix : "");
} else {
buffer.append(negativeSuffix != null ? negativeSuffix : positiveSuffix != null ? positiveSuffix : "");
}
}
private void formatRegular(long mantissa, int exponent, StringBuffer buffer) {
@ -420,15 +427,28 @@ public class TDecimalFormat extends TNumberFormat {
}
break;
case HALF_DOWN:
mantissa = ((mantissa + rounding / 2 - 1) / rounding) * rounding;
if (mantissa % rounding == rounding / 2) {
mantissa = (mantissa / rounding) * rounding;
} else {
mantissa = ((mantissa + rounding / 2) / rounding) * rounding;
}
break;
case HALF_UP:
mantissa = ((mantissa + rounding / 2 + 1) / rounding) * rounding;
if (mantissa % rounding == rounding / 2) {
mantissa = (mantissa / rounding) * rounding + rounding;
} else {
mantissa = ((mantissa + rounding / 2) / rounding) * rounding;
}
break;
case HALF_EVEN: {
int digit = (int)((mantissa / rounding) % 10);
int delta = digit % 2 == 0 ? -1 : 1;
mantissa = ((mantissa + rounding / 2 + delta) / rounding) * rounding;
if (mantissa % rounding == rounding / 2) {
mantissa = (mantissa / rounding) * rounding;
if ((mantissa / rounding) % 2 != 0) {
mantissa += rounding;
}
} else {
mantissa = ((mantissa + rounding / 2) / rounding) * rounding;
}
break;
}
}
@ -474,7 +494,7 @@ public class TDecimalFormat extends TNumberFormat {
result += 2;
value /= 100;
}
if (value >= 10L) {
if (value >= 10) {
result += 1;
value /= 10;
}

10
teavm-tests/src/test/java/org/teavm/classlib/java/text/DecimalFormatTest.java
View File

@ -263,6 +263,16 @@ public class DecimalFormatTest {
assertEquals("1.234E4", format.format(12345));
}
@Test
public void formatsExponentWithMultiplier() {
DecimalFormat format = createFormat("##0.00E0");
assertEquals("2.30E0", format.format(2.3));
assertEquals("23.0E0", format.format(23));
assertEquals("230E0", format.format(230));
assertEquals("2.30E3", format.format(2300));
assertEquals("23.0E3", format.format(23000));
}
private DecimalFormat createFormat(String format) {
return new DecimalFormat(format, symbols);
}