Format BigInteger directly

jscl/src/main/java/jscl/JsclMathEngine.java

@@ -17,6 +17,7 @@ import org.solovyev.common.msg.Messages;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 import java.math.BigDecimal;
+import java.math.BigInteger;
 import java.util.List;
 
 import static midpcalc.Real.NumberFormat.*;
@@ -166,6 +167,10 @@ public class JsclMathEngine implements MathEngine {
                 return constant.getName();
             }
         }
+        return prepareNumberFormatter(nb).format(value, nb.radix).toString();
+    }
+
+    private NumberFormatter prepareNumberFormatter(@Nonnull NumeralBase nb) {
         final NumberFormatter nf = numberFormatter.get();
         nf.setGroupingSeparator(useGroupingSeparator ? getGroupingSeparatorChar(nb) : NumberFormatter.NO_GROUPING);
         nf.setPrecision(roundResult ? precision : NumberFormatter.NO_ROUNDING);
@@ -180,7 +185,22 @@ public class JsclMathEngine implements MathEngine {
                 nf.useSimpleFormat();
                 break;
         }
-        return nf.format(value, nb.radix).toString();
+        return nf;
+    }
+
+    @Override
+    public String format(@Nonnull BigInteger value) throws NumeralBaseException {
+        return format(value, numeralBase);
+    }
+
+    @Nonnull
+    public String format(@Nonnull BigInteger value, @Nonnull NumeralBase nb) throws NumeralBaseException {
+        if (nb == NumeralBase.dec) {
+            if (BigInteger.ZERO.equals(value)) {
+                return "0";
+            }
+        }
+        return prepareNumberFormatter(nb).format(value, nb.radix).toString();
     }
 
     @Nullable

jscl/src/main/java/jscl/MathContext.java

@@ -6,6 +6,7 @@ import jscl.math.operator.Operator;
 import org.solovyev.common.math.MathRegistry;
 
 import javax.annotation.Nonnull;
+import java.math.BigInteger;
 
 public interface MathContext {
 
@@ -46,6 +47,8 @@ public interface MathContext {
     @Nonnull
     String format(double value) throws NumeralBaseException;
 
+    String format(@Nonnull BigInteger value) throws NumeralBaseException;
+
     @Nonnull
     String format(double value, @Nonnull NumeralBase nb) throws NumeralBaseException;
 

jscl/src/main/java/jscl/math/JsclInteger.java

@@ -352,8 +352,7 @@ public final class JsclInteger extends Generic {
     }
 
     public String toString() {
-        // todo serso: actually better way is to provide custom format() method for integers and not to convert integer to double
+        return JsclMathEngine.getInstance().format(content);
-        return JsclMathEngine.getInstance().format(this.content.doubleValue());
     }
 
     public String toJava() {

jscl/src/main/java/org/solovyev/common/NumberFormatter.java

@@ -1,16 +1,13 @@
 package org.solovyev.common;
 
-import java.math.BigDecimal;
-
-import javax.annotation.Nonnull;
-
 import midpcalc.Real;
 
+import javax.annotation.Nonnull;
+import java.math.BigDecimal;
+import java.math.BigInteger;
+
 import static java.lang.Math.pow;
-import static midpcalc.Real.NumberFormat.FSE_ENG;
+import static midpcalc.Real.NumberFormat.*;
-import static midpcalc.Real.NumberFormat.FSE_FIX;
-import static midpcalc.Real.NumberFormat.FSE_NONE;
-import static midpcalc.Real.NumberFormat.FSE_SCI;
 
 public class NumberFormatter {
 
@@ -54,11 +51,14 @@ public class NumberFormatter {
         return format(value, 10);
     }
 
+    @Nonnull
+    public CharSequence format(@Nonnull  BigInteger value) {
+        return format(value, 10);
+    }
+
     @Nonnull
     public CharSequence format(double value, int radix) {
-        if (radix != 2 && radix != 8 && radix != 10 && radix != 16) {
+        checkRadix(radix);
-            throw new IllegalArgumentException("Unsupported radix: " + radix);
-        }
         double absValue = Math.abs(value);
         final boolean simpleFormat = useSimpleFormat(radix, absValue);
 
@@ -88,6 +88,39 @@ public class NumberFormatter {
         return prepare(value);
     }
 
+    @Nonnull
+    public CharSequence format(@Nonnull BigInteger value, int radix) {
+        checkRadix(radix);
+        final BigInteger absValue = value.abs();
+        final boolean simpleFormat = useSimpleFormat(radix, absValue);
+
+        final int effectivePrecision = precision == NO_ROUNDING ? MAX_PRECISION : precision;
+        if (simpleFormat) {
+            numberFormat.fse = FSE_FIX;
+        } else if (format == FSE_NONE) {
+            // originally, a simple format was requested but we have to use something more appropriate, f.e. scientific
+            // format
+            numberFormat.fse = FSE_SCI;
+        } else {
+            numberFormat.fse = format;
+        }
+        numberFormat.thousand = groupingSeparator;
+        numberFormat.precision = effectivePrecision;
+        numberFormat.base = radix;
+        numberFormat.maxwidth = simpleFormat ? 100 : 30;
+
+        if (radix == 2 && value.compareTo(BigInteger.ZERO) < 0) {
+            return "-" + prepare(absValue);
+        }
+        return prepare(value);
+    }
+
+    private void checkRadix(int radix) {
+        if (radix != 2 && radix != 8 && radix != 10 && radix != 16) {
+            throw new IllegalArgumentException("Unsupported radix: " + radix);
+        }
+    }
+
     private boolean useSimpleFormat(int radix, double absValue) {
         if (radix != 10) {
             return true;
@@ -103,17 +136,41 @@ public class NumberFormatter {
         return false;
     }
 
+    private boolean useSimpleFormat(int radix, @Nonnull BigInteger absValue) {
+        if (radix != 10) {
+            return true;
+        }
+        if (format == FSE_NONE) {
+            return true;
+        }
+        if (absValue.compareTo(BigInteger.valueOf((long) pow(10, simpleFormatMagnitude))) < 0) {
+            return true;
+        }
+        return false;
+    }
+
     @Nonnull
     private CharSequence prepare(double value) {
         return stripZeros(realFormat(value)).replace('e', 'E');
     }
 
+    @Nonnull
+    private CharSequence prepare(@Nonnull  BigInteger value) {
+        return stripZeros(realFormat(value)).replace('e', 'E');
+    }
+
     @Nonnull
     private String realFormat(double value) {
         real.assign(Double.toString(value));
         return real.toString(numberFormat);
     }
 
+    @Nonnull
+    private String realFormat(@Nonnull  BigInteger value) {
+        real.assign(value.toString());
+        return real.toString(numberFormat);
+    }
+
     @Nonnull
     private String stripZeros(@Nonnull String s) {
         int dot = -1;

jscl/src/test/java/org/solovyev/common/NumberFormatterTest.java

@@ -3,7 +3,10 @@ package org.solovyev.common;
 import org.junit.Before;
 import org.junit.Test;
 
+import java.math.BigInteger;
+
 import static java.lang.Math.pow;
+import static java.math.BigInteger.TEN;
 import static org.junit.Assert.assertEquals;
 import static org.solovyev.common.NumberFormatter.DEFAULT_MAGNITUDE;
 import static org.solovyev.common.NumberFormatter.NO_ROUNDING;
@@ -99,32 +102,66 @@ public class NumberFormatterTest {
     // testing simple format with and without rounding
     private void testSimpleFormat() {
         assertEquals("0.00001", numberFormatter.format(pow(10, -5)));
+
         assertEquals("100", numberFormatter.format(pow(10, 2)));
+        assertEquals("1", numberFormatter.format(BigInteger.ONE));
+        assertEquals("1000", numberFormatter.format(BigInteger.valueOf(1000)));
+
         assertEquals("1000000000000000000", numberFormatter.format(pow(10, 18)));
+        assertEquals("1000000000000000000", numberFormatter.format(BigInteger.valueOf(10).pow(18)));
+
         assertEquals("1E19", numberFormatter.format(pow(10, 19)));
+        assertEquals("1E19", numberFormatter.format(BigInteger.valueOf(10).pow(19)));
+
         assertEquals("1E20", numberFormatter.format(pow(10, 20)));
+        assertEquals("1E20", numberFormatter.format(BigInteger.valueOf(10).pow(20)));
+
         assertEquals("1E100", numberFormatter.format(pow(10, 100)));
+        assertEquals("1E100", numberFormatter.format(BigInteger.valueOf(10).pow(100)));
 
         assertEquals("0.01", numberFormatter.format(pow(10, -2)));
 
         assertEquals("5000000000000000000", numberFormatter.format(5000000000000000000d));
+        assertEquals("5000000000000000000", numberFormatter.format(BigInteger.valueOf(5000000000000000000L)));
+
         assertEquals("5000000000000000000", numberFormatter.format(5000000000000000001d));
+        assertEquals("5000000000000000001", numberFormatter.format(BigInteger.valueOf(5000000000000000001L)));
+
         assertEquals("5999999999999994900", numberFormatter.format(5999999999999994999d));
+        assertEquals("5999999999999994999", numberFormatter.format(BigInteger.valueOf(5999999999999994999L)));
+
         assertEquals("5E19", numberFormatter.format(50000000000000000000d));
+        assertEquals("5E19", numberFormatter.format(BigInteger.valueOf(5L).multiply(TEN.pow(19))));
+
         assertEquals("5E40", numberFormatter.format(50000000000000000000000000000000000000000d));
+        assertEquals("5E40", numberFormatter.format(BigInteger.valueOf(5L).multiply(TEN.pow(40))));
     }
 
     // testing scientific format with and without rounding
     private void testScientificFormat() {
         assertEquals("0.00001", numberFormatter.format(pow(10, -5)));
         assertEquals("1E-6", numberFormatter.format(pow(10, -6)));
+
         assertEquals("100", numberFormatter.format(pow(10, 2)));
+        assertEquals("100", numberFormatter.format(TEN.pow(2)));
+
         assertEquals("10000", numberFormatter.format(pow(10, 4)));
+        assertEquals("10000", numberFormatter.format(TEN.pow(4)));
+
         assertEquals("1E5", numberFormatter.format(pow(10, 5)));
+        assertEquals("1E5", numberFormatter.format(TEN.pow(5)));
+
         assertEquals("1E18", numberFormatter.format(pow(10, 18)));
+        assertEquals("1E18", numberFormatter.format(TEN.pow(18)));
+
         assertEquals("1E19", numberFormatter.format(pow(10, 19)));
+        assertEquals("1E19", numberFormatter.format(TEN.pow( 19)));
+
         assertEquals("1E20", numberFormatter.format(pow(10, 20)));
+        assertEquals("1E20", numberFormatter.format(TEN.pow(20)));
+
         assertEquals("1E100", numberFormatter.format(pow(10, 100)));
+        assertEquals("1E100", numberFormatter.format(TEN.pow(100)));
 
         assertEquals("0.01", numberFormatter.format(pow(10, -2)));
         assertEquals("1E-17", numberFormatter.format(pow(10, -17)));