test/jdk/java/util/regex/whitebox/GraphemeTest.java

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/*
 * @test
 * @bug 7071819 8221431 8239383 8273430 8291660
 * @summary tests Unicode Extended Grapheme support
 * @library /lib/testlibrary/java/lang
 * @modules java.base/jdk.internal.util.regex:+open
 * @run testng GraphemeTest
 */

import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.nio.file.Files;
import java.nio.file.Path;
import jdk.internal.util.regex.Grapheme;

import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;
import static org.testng.Assert.fail;
import static org.testng.Assert.assertFalse;

public class GraphemeTest {

    private static MethodHandles.Lookup lookup;

    @BeforeClass
    public static void setup() throws IllegalAccessException {
        lookup = MethodHandles.privateLookupIn(Grapheme.class, MethodHandles.lookup());
    }

    @Test
    public static void testGraphemeBreakProperty() throws Throwable {
        testProps(UCDFiles.GRAPHEME_BREAK_PROPERTY);
    }

    @Test
    public static void testEmojiData() throws Throwable {
        testProps(UCDFiles.EMOJI_DATA);
    }

    @Test
    public static void testExcludedSpacingMarks() throws Throwable {
        var mh = lookup.findStatic(
                Grapheme.class, "isExcludedSpacingMark", MethodType.methodType(boolean.class, int.class));
        assertFalse((boolean)mh.invokeExact(0x1065));
        assertFalse((boolean)mh.invokeExact(0x1066));
    }

    private static void testProps(Path path) throws Throwable {
        var mh = lookup.findStatic(
                Grapheme.class, "getType", MethodType.methodType(int.class, int.class));
        Files.lines(path)
                .map(ln -> ln.replaceFirst("#.*", ""))
                .filter(ln -> ln.length() != 0)
                .forEach(ln -> {
                    String[] strs = ln.split("\\s+");
                    int off = strs[0].indexOf("..");
                    int cp0, cp1;
                    String expected = strs[2];
                    if (off != -1) {
                        cp0 = Integer.parseInt(strs[0], 0, off, 16);
                        cp1 = Integer.parseInt(strs[0], off + 2, strs[0].length(), 16);
                    } else {
                        cp0 = cp1 = Integer.parseInt(strs[0], 16);
                    }
                    for (int cp = cp0; cp <= cp1; cp++) {
                        // Ignore Emoji* for now (only interested in Extended_Pictographic)
                        if (expected.startsWith("Emoji")) {
                            continue;
                        }

                        // NOTE:
                        // #tr29 "plus a few General_Category = Spacing_Mark needed for
                        // canonical equivalence."
                        // For "extended grapheme clusters" support, there is no
                        // need actually to diff "Extend" and "SpacingMark" given GB9, GB9a.
                        try {
                            if (!expected.equals(types[(int) mh.invokeExact(cp)])) {
                                if ("Extend".equals(expected) &&
                                        "SpacingMark".equals(types[(int) mh.invokeExact(cp)]))
                                    System.out.printf("[%x]  [%s][%d] -> [%s]%n",
                                            cp, expected, Character.getType(cp), types[(int) mh.invokeExact(cp)]);
                                else
                                    fail(String.format(
                                            "cp=[%x], expected:[%s] result:[%s]%n",
                                            cp, expected, types[(int) mh.invokeExact(cp)]));
                            }
                        } catch (Throwable e) {
                            throw new RuntimeException(e);
                        }
                    }
                });
    }

    private static final String[] types = {
            "Other", "CR", "LF", "Control", "Extend", "ZWJ", "Regional_Indicator",
            "Prepend", "SpacingMark",
            "L", "V", "T", "LV", "LVT",
            "Extended_Pictographic"};
}