ch.randelshofer.fastdoubleparser.JavaDoubleBitsFromCharArray Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of fastdoubleparser Show documentation

A Java port of Daniel Lemire's fast_float project.

There is a newer version: 2.0.1

/*
 * @(#)JavaDoubleBitsFromCharArray.java
 * Copyright © 2023 Werner Randelshofer, Switzerland. MIT License.
 */
package ch.randelshofer.fastdoubleparser;

/**
 * Parses a {@code double} from a {@code char} array.
 */
final class JavaDoubleBitsFromCharArray extends AbstractJavaFloatingPointBitsFromCharArray {

    /**
     * Creates a new instance.
     */
    public JavaDoubleBitsFromCharArray() {

    }

    @Override
    long nan() {
        return Double.doubleToRawLongBits(Double.NaN);
    }

    @Override
    long negativeInfinity() {
        return Double.doubleToRawLongBits(Double.NEGATIVE_INFINITY);
    }

    @Override
    long positiveInfinity() {
        return Double.doubleToRawLongBits(Double.POSITIVE_INFINITY);
    }

    @Override
    long valueOfFloatLiteral(char[] str, int startIndex, int endIndex, boolean isNegative,
                             long significand, int exponent, boolean isSignificandTruncated,
                             int exponentOfTruncatedSignificand) {
        double d = FastDoubleMath.tryDecFloatToDoubleTruncated(isNegative, significand, exponent, isSignificandTruncated,
                exponentOfTruncatedSignificand);
        return Double.doubleToRawLongBits(Double.isNaN(d) ? Double.parseDouble(new String(str, startIndex, endIndex - startIndex)) : d);
    }

    @Override
    long valueOfHexLiteral(
            char[] str, int startIndex, int endIndex, boolean isNegative, long significand, int exponent,
            boolean isSignificandTruncated, int exponentOfTruncatedSignificand) {
        double d = FastDoubleMath.tryHexFloatToDoubleTruncated(isNegative, significand, exponent, isSignificandTruncated,
                exponentOfTruncatedSignificand);
        return Double.doubleToRawLongBits(Double.isNaN(d) ? Double.parseDouble(new String(str, startIndex, endIndex - startIndex)) : d);
    }
}