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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.text;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
@SuppressWarnings("deprecation")
/**
* @author arnej27959
*/
public class DoubleParserTestCase {
@Test
public void testZero() {
String[] zeros = {
"0",
"0.",
".0",
"0.0",
"0.0e0",
"0.0e99",
"0.0e+300",
"0.0e-42"
};
for (String s : zeros) {
double d = DoubleParser.parse(s);
assertEquals(0.0, d, 0);
}
}
@Test
public void testOne() {
String[] ones = {
"1",
"1.",
"1.0",
"+1",
"10.0e-1",
"0.1e1",
"1000.0e-3",
".001e+3",
};
for (String s : ones) {
System.out.println("parsing: '"+s+"' now");
double d = DoubleParser.parse(s);
System.out.println("expected: 1.0");
System.out.println("actual: "+d);
assertEquals(1.0, d, 0);
}
}
@Test
public void testMinusOne() {
String[] numbers = {
"-1",
"-1.0",
"-1.",
"-1e0",
"-10e-1",
};
for (String s : numbers) {
System.out.println("parsing: '"+s+"' now");
double d = DoubleParser.parse(s);
System.out.println("expected: -1.0");
System.out.println("actual: "+d);
assertEquals(-1.0, d, 0);
}
}
@Test
public void testNanInf() {
String[] numbers = {
"NaN",
"Infinity",
"-Infinity",
"+Infinity",
"+NaN",
"-NaN"
};
for (String s : numbers) {
System.out.println("parsing: '"+s+"' now");
double d1 = Double.parseDouble(s);
double d2 = DoubleParser.parse(s);
long lb1 = Double.doubleToRawLongBits(d1);
long lb2 = Double.doubleToRawLongBits(d2);
assertEquals(lb1, lb2, 0);
}
}
@Test
public void testSeven() {
String[] sevens = {
"7",
"7.",
"7.0",
"70.0e-1",
"0.7e1",
"7000.0e-3",
".007e+3",
};
for (String s : sevens) {
System.out.println("parsing: '"+s+"' now");
double d = DoubleParser.parse(s);
System.out.println("expected: 7.0");
System.out.println("actual: "+d);
assertEquals(7.0, d, 0);
}
}
@Test
public void testVerySmallNumbers() {
String[] numbers = {
"1.e-320",
"-1.e-320",
"1.0013378241589014e-303"
};
for (String s : numbers) {
System.out.println("parsing: '"+s+"' now");
double d1 = Double.parseDouble(s);
double d2 = DoubleParser.parse(s);
System.out.println("expected: "+d1);
System.out.println("actual: "+d2);
assertEquals(d1, d2, 0);
}
}
@Test
public void testRandomNumbers() {
java.util.Random rgen = new java.util.Random(0xCafeBabe);
for (int i = 0; i < 123456; i++) {
double d = rgen.nextDouble();
int exp = rgen.nextInt();
d *= Math.pow(1.0000006, exp);
String s = Double.toString(d);
double d2 = Double.parseDouble(s);
double d3 = DoubleParser.parse(s);
if (d != d2) {
System.out.println("WARNING: value ["+d+"] parses as ["+d2+"] by Java");
}
double allow = 1.0e-14 * d2;
if (allow < 0) {
allow = -allow;
}
if (d2 != d3) {
long lb2 = Double.doubleToRawLongBits(d2);
long lb3 = Double.doubleToRawLongBits(d3);
if (lb2 - lb3 > 15 || lb3 - lb2 > 15) {
System.out.println("WARNING: string '"+s+"' parses as");
System.out.println("["+d2+"] by Java, ["+d3+"] by our method");
System.out.println("["+Long.toHexString(lb2)+"] bits vs ["+Long.toHexString(lb3)+"]");
System.out.println("==> "+(lb2 - lb3)+" <== diff value");
}
}
assertEquals(d2, d3, allow);
}
}
}
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