329 lines
10 KiB
Java
329 lines
10 KiB
Java
/*
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* Copyright (c) 1998, 2024, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 4160406 4705734 4707389 6358355 7032154
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* @summary Tests for Float.parseFloat method
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*/
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import java.math.BigDecimal;
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import java.math.BigInteger;
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public class ParseFloat {
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private static final BigDecimal HALF = BigDecimal.valueOf(0.5);
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private static void fail(String val, float n) {
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throw new RuntimeException("Float.parseFloat failed. String:" +
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val + " Result:" + n);
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}
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private static void check(String val) {
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float n = Float.parseFloat(val);
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boolean isNegativeN = n < 0 || n == 0 && 1/n < 0;
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float na = Math.abs(n);
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String s = val.trim().toLowerCase();
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switch (s.charAt(s.length() - 1)) {
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case 'd':
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case 'f':
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s = s.substring(0, s.length() - 1);
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break;
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}
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boolean isNegative = false;
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if (s.charAt(0) == '+') {
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s = s.substring(1);
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} else if (s.charAt(0) == '-') {
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s = s.substring(1);
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isNegative = true;
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}
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if (s.equals("nan")) {
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if (!Float.isNaN(n)) {
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fail(val, n);
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}
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return;
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}
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if (Float.isNaN(n)) {
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fail(val, n);
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}
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if (isNegativeN != isNegative)
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fail(val, n);
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if (s.equals("infinity")) {
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if (na != Float.POSITIVE_INFINITY) {
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fail(val, n);
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}
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return;
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}
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BigDecimal bd;
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if (s.startsWith("0x")) {
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s = s.substring(2);
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int indP = s.indexOf('p');
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long exp = Long.parseLong(s.substring(indP + 1));
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int indD = s.indexOf('.');
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String significand;
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if (indD >= 0) {
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significand = s.substring(0, indD) + s.substring(indD + 1, indP);
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exp -= 4*(indP - indD - 1);
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} else {
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significand = s.substring(0, indP);
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}
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bd = new BigDecimal(new BigInteger(significand, 16));
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if (exp >= 0) {
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bd = bd.multiply(BigDecimal.valueOf(2).pow((int)exp));
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} else {
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bd = bd.divide(BigDecimal.valueOf(2).pow((int)-exp));
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}
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} else {
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bd = new BigDecimal(s);
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}
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BigDecimal l, u;
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if (Float.isInfinite(na)) {
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l = new BigDecimal(Float.MAX_VALUE).add(new BigDecimal(Math.ulp(Float.MAX_VALUE)).multiply(HALF));
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u = null;
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} else {
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l = new BigDecimal(na).subtract(new BigDecimal(Math.ulp(-Math.nextUp(-na))).multiply(HALF));
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u = new BigDecimal(na).add(new BigDecimal(Math.ulp(n)).multiply(HALF));
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}
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int cmpL = bd.compareTo(l);
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int cmpU = u != null ? bd.compareTo(u) : -1;
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if ((Float.floatToIntBits(n) & 1) != 0) {
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if (cmpL <= 0 || cmpU >= 0) {
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fail(val, n);
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}
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} else {
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if (cmpL < 0 || cmpU > 0) {
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fail(val, n);
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}
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}
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}
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private static void check(String val, float expected) {
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float n = Float.parseFloat(val);
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if (n != expected)
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fail(val, n);
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check(val);
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}
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private static void rudimentaryTest() {
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check(new String(""+Float.MIN_VALUE), Float.MIN_VALUE);
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check(new String(""+Float.MAX_VALUE), Float.MAX_VALUE);
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check("10", (float) 10.0);
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check("10.0", (float) 10.0);
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check("10.01", (float) 10.01);
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check("-10", (float) -10.0);
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check("-10.00", (float) -10.0);
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check("-10.01", (float) -10.01);
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// bug 6358355
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check("144115196665790480", 0x1.000002p57f);
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check("144115196665790481", 0x1.000002p57f);
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check("0.050000002607703203", 0.05f);
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check("0.050000002607703204", 0.05f);
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check("0.050000002607703205", 0.05f);
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check("0.050000002607703206", 0.05f);
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check("0.050000002607703207", 0.05f);
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check("0.050000002607703208", 0.05f);
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check("0.050000002607703209", 0.050000004f);
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}
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static String badStrings[] = {
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"",
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"+",
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"-",
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"+e",
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"-e",
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"+e170",
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"-e170",
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// Make sure intermediate white space is not deleted.
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"1234 e10",
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"-1234 e10",
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// Control characters in the interior of a string are not legal
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"1\u0007e1",
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"1e\u00071",
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// NaN and infinity can't have trailing type suffices or exponents
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"NaNf",
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"NaNF",
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"NaNd",
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"NaND",
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"-NaNf",
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"-NaNF",
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"-NaNd",
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"-NaND",
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"+NaNf",
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"+NaNF",
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"+NaNd",
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"+NaND",
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"Infinityf",
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"InfinityF",
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"Infinityd",
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"InfinityD",
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"-Infinityf",
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"-InfinityF",
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"-Infinityd",
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"-InfinityD",
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"+Infinityf",
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"+InfinityF",
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"+Infinityd",
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"+InfinityD",
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"NaNe10",
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"-NaNe10",
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"+NaNe10",
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"Infinitye10",
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"-Infinitye10",
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"+Infinitye10",
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// Non-ASCII digits are not recognized
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"\u0661e\u0661", // 1e1 in Arabic-Indic digits
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"\u06F1e\u06F1", // 1e1 in Extended Arabic-Indic digits
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"\u0967e\u0967", // 1e1 in Devanagari digits
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"\uD835\uDFD9e\uD835\uDFD9" // 1e1 in Mathematical Alphanumeric Symbols
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};
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static String goodStrings[] = {
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"NaN",
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"+NaN",
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"-NaN",
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"Infinity",
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"+Infinity",
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"-Infinity",
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"1.1e-23f",
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".1e-23f",
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"1e-23",
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"1f",
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"1",
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"2",
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"1234",
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"-1234",
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"+1234",
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"2147483647", // Integer.MAX_VALUE
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"2147483648",
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"-2147483648", // Integer.MIN_VALUE
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"-2147483649",
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"16777215",
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"16777216", // 2^24
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"16777217",
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"-16777215",
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"-16777216", // -2^24
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"-16777217",
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"9007199254740991",
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"9007199254740992", // 2^53
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"9007199254740993",
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"-9007199254740991",
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"-9007199254740992", // -2^53
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"-9007199254740993",
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"9223372036854775807",
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"9223372036854775808", // Long.MAX_VALUE
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"9223372036854775809",
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"-9223372036854775808",
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"-9223372036854775809", // Long.MIN_VALUE
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"-9223372036854775810"
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};
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static String paddedBadStrings[];
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static String paddedGoodStrings[];
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static {
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String pad = " \t\n\r\f\u0001\u000b\u001f";
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paddedBadStrings = new String[badStrings.length];
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for(int i = 0 ; i < badStrings.length; i++)
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paddedBadStrings[i] = pad + badStrings[i] + pad;
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paddedGoodStrings = new String[goodStrings.length];
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for(int i = 0 ; i < goodStrings.length; i++)
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paddedGoodStrings[i] = pad + goodStrings[i] + pad;
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}
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/*
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* Throws an exception if <code>Input</code> is
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* <code>exceptionalInput</code> and {@link Float.parseFloat
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* parseFloat} does <em>not</em> throw an exception or if
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* <code>Input</code> is not <code>exceptionalInput</code> and
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* <code>parseFloat</code> throws an exception. This method does
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* not attempt to test whether the string is converted to the
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* proper value; just whether the input is accepted appropriately
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* or not.
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*/
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private static void testParsing(String [] input,
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boolean exceptionalInput) {
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for (String s : input) {
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try {
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Float.parseFloat(s);
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check(s);
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} catch (NumberFormatException e) {
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if (!exceptionalInput) {
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throw new RuntimeException("Float.parseFloat rejected " +
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"good string `" + s +
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"'.");
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}
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continue;
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}
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if (exceptionalInput) {
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throw new RuntimeException("Float.parseFloat accepted " +
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"bad string `" + s +
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"'.");
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}
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}
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}
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/**
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* For each power of two, test at boundaries of
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* region that should convert to that value.
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*/
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private static void testPowers() {
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for(int i = -149; i <= +127; i++) {
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float f = Math.scalb(1.0f, i);
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BigDecimal f_BD = new BigDecimal(f);
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BigDecimal lowerBound = f_BD.subtract(new BigDecimal(Math.ulp(-Math.nextUp(-f))).multiply(HALF));
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BigDecimal upperBound = f_BD.add(new BigDecimal(Math.ulp(f)).multiply(HALF));
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check(lowerBound.toString());
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check(upperBound.toString());
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}
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check(new BigDecimal(Float.MAX_VALUE).add(new BigDecimal(Math.ulp(Float.MAX_VALUE)).multiply(HALF)).toString());
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}
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public static void main(String[] args) throws Exception {
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rudimentaryTest();
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testParsing(goodStrings, false);
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testParsing(paddedGoodStrings, false);
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testParsing(badStrings, true);
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testParsing(paddedBadStrings, true);
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testPowers();
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}
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}
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