Verify writer outputs against 3rd-party readers

CHANGELOG.md

@@ -6,6 +6,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 - Added IntelliJ IDEA migration map reader and writer
 - Added `MappingFormat#features()` to allow for more fine-grained programmatic querying of format capabilities
+- Added tests to validate our writer outputs against 3rd-party readers
 - Overhauled the internal `ColumnFileReader` to behave more consistently
 - Made handling of the `NEEDS_MULTIPLE_PASSES` flag more consistent, reducing memory usage in a few cases
 - Made some internal methods in Enigma and TSRG readers actually private

build.gradle

@@ -33,6 +33,10 @@ allprojects {
 		implementation "org.ow2.asm:asm:${project.asm_version}"
 		compileOnly "org.jetbrains:annotations:${project.jetbrains_annotations_version}"
 
+		testImplementation "net.neoforged:srgutils:${srgutils_version}"
+		testImplementation "org.cadixdev:lorenz:${lorenz_version}"
+		testImplementation "org.cadixdev:lorenz-io-enigma:${lorenz_version}"
+		testImplementation "org.cadixdev:lorenz-io-jam:${lorenz_version}"
 		testImplementation "org.junit.jupiter:junit-jupiter:${junit_jupiter_version}"
 		testRuntimeOnly "org.junit.platform:junit-platform-launcher"
 		testCompileOnly "org.jetbrains:annotations:${project.jetbrains_annotations_version}"

gradle.properties

@@ -10,3 +10,5 @@ tiny_remapper_version = 0.8.0
 jetbrains_annotations_version = 24.0.1
 checkstyle_tool_version = 10.12.4
 junit_jupiter_version = 5.10.0
+srgutils_version = 1.0.9
+lorenz_version = 0.5.8

src/test/java/net/fabricmc/mappingio/TestHelper.java

@@ -23,6 +23,8 @@
 import java.util.Arrays;
 import java.util.concurrent.atomic.AtomicInteger;
 
+import net.neoforged.srgutils.IMappingFile;
+import org.cadixdev.lorenz.io.MappingFormats;
 import org.jetbrains.annotations.Nullable;
 
 import net.fabricmc.mappingio.format.MappingFormat;
@@ -74,6 +76,66 @@ public static String getFileName(MappingFormat format) {
 		}
 	}
 
+	@Nullable
+	public static org.cadixdev.lorenz.io.MappingFormat toLorenzFormat(MappingFormat format) {
+		switch (format) {
+		case SRG_FILE:
+			return MappingFormats.SRG;
+		case XSRG_FILE:
+			return MappingFormats.XSRG;
+		case CSRG_FILE:
+			return MappingFormats.CSRG;
+		case TSRG_FILE:
+			return MappingFormats.TSRG;
+		case ENIGMA_FILE:
+			return MappingFormats.byId("enigma");
+		case JAM_FILE:
+			return MappingFormats.byId("jam");
+		case TINY_FILE:
+		case TINY_2_FILE:
+		case ENIGMA_DIR:
+		case TSRG_2_FILE:
+		case PROGUARD_FILE:
+		case INTELLIJ_MIGRATION_MAP_FILE:
+		case RECAF_SIMPLE_FILE:
+		case JOBF_FILE:
+			return null;
+		default:
+			throw new IllegalArgumentException("Unknown format: " + format);
+		}
+	}
+
+	@Nullable
+	public static IMappingFile.Format toSrgUtilsFormat(MappingFormat format) {
+		switch (format) {
+		case TINY_FILE:
+			return IMappingFile.Format.TINY1;
+		case TINY_2_FILE:
+			return IMappingFile.Format.TINY;
+		case SRG_FILE:
+			return IMappingFile.Format.SRG;
+		case XSRG_FILE:
+			return IMappingFile.Format.XSRG;
+		case CSRG_FILE:
+			return IMappingFile.Format.CSRG;
+		case TSRG_FILE:
+			return IMappingFile.Format.TSRG;
+		case TSRG_2_FILE:
+			return IMappingFile.Format.TSRG2;
+		case PROGUARD_FILE:
+			return IMappingFile.Format.PG;
+		case ENIGMA_FILE:
+		case ENIGMA_DIR:
+		case JAM_FILE:
+		case INTELLIJ_MIGRATION_MAP_FILE:
+		case RECAF_SIMPLE_FILE:
+		case JOBF_FILE:
+			return null;
+		default:
+			throw new IllegalArgumentException("Unknown format: " + format);
+		}
+	}
+
 	public static Path writeToDir(MappingTreeView tree, Path dir, MappingFormat format) throws IOException {
 		Path path = dir.resolve(getFileName(format));
 		tree.accept(MappingWriter.create(path, format));

src/test/java/net/fabricmc/mappingio/write/WriteTest.java

@@ -16,16 +16,24 @@
 
 package net.fabricmc.mappingio.write;
 
+import java.io.IOException;
 import java.nio.file.Path;
+import java.util.HashMap;
+import java.util.Map;
 
+import net.neoforged.srgutils.IMappingFile;
+import net.neoforged.srgutils.INamedMappingFile;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.io.TempDir;
 
+import net.fabricmc.mappingio.MappedElementKind;
 import net.fabricmc.mappingio.MappingReader;
 import net.fabricmc.mappingio.SubsetAssertingVisitor;
 import net.fabricmc.mappingio.TestHelper;
 import net.fabricmc.mappingio.adapter.FlatAsRegularMappingVisitor;
+import net.fabricmc.mappingio.adapter.ForwardingMappingVisitor;
+import net.fabricmc.mappingio.adapter.MappingNsCompleter;
 import net.fabricmc.mappingio.format.MappingFormat;
 import net.fabricmc.mappingio.tree.MappingTreeView;
 import net.fabricmc.mappingio.tree.MemoryMappingTree;
@@ -35,12 +43,19 @@ public class WriteTest {
 	@TempDir
 	private static Path dir;
 	private static MappingTreeView validTree;
+	private static Map<String, String> treeNsAltMap = new HashMap<>();
 	private static MappingTreeView validWithHolesTree;
+	private static Map<String, String> treeWithHolesNsAltMap = new HashMap<>();
 
 	@BeforeAll
 	public static void setup() throws Exception {
 		validTree = TestHelper.createTestTree();
+		treeNsAltMap.put(validTree.getDstNamespaces().get(0), validTree.getSrcNamespace());
+		treeNsAltMap.put(validTree.getDstNamespaces().get(1), validTree.getSrcNamespace());
+
 		validWithHolesTree = TestHelper.createTestTreeWithHoles();
+		treeWithHolesNsAltMap.put(validWithHolesTree.getDstNamespaces().get(0), validWithHolesTree.getSrcNamespace());
+		treeWithHolesNsAltMap.put(validWithHolesTree.getDstNamespaces().get(1), validWithHolesTree.getSrcNamespace());
 	}
 
 	@Test
@@ -114,17 +129,46 @@ public void jobfFile() throws Exception {
 	}
 
 	private void check(MappingFormat format) throws Exception {
-		dogfood(validTree, dir, format);
-		dogfood(validWithHolesTree, dir, format);
+		Path path = TestHelper.writeToDir(validTree, dir, format);
+		readWithMio(validTree, path, format);
+		readWithLorenz(path, format);
+		readWithSrgUtils(validTree, format, treeNsAltMap);
+
+		path = TestHelper.writeToDir(validWithHolesTree, dir, format);
+		readWithMio(validWithHolesTree, path, format);
+		readWithLorenz(path, format);
+		readWithSrgUtils(validWithHolesTree, format, treeWithHolesNsAltMap);
 	}
 
-	private void dogfood(MappingTreeView origTree, Path outputPath, MappingFormat outputFormat) throws Exception {
-		outputPath = TestHelper.writeToDir(origTree, dir, outputFormat);
+	private void readWithMio(MappingTreeView origTree, Path outputPath, MappingFormat outputFormat) throws Exception {
 		VisitableMappingTree writtenTree = new MemoryMappingTree();
-
 		MappingReader.read(outputPath, outputFormat, writtenTree);
 
 		writtenTree.accept(new FlatAsRegularMappingVisitor(new SubsetAssertingVisitor(origTree, null, outputFormat)));
 		origTree.accept(new FlatAsRegularMappingVisitor(new SubsetAssertingVisitor(writtenTree, outputFormat, null)));
 	}
+
+	private void readWithLorenz(Path path, MappingFormat format) throws Exception {
+		org.cadixdev.lorenz.io.MappingFormat lorenzFormat = TestHelper.toLorenzFormat(format);
+		if (lorenzFormat == null) return;
+		lorenzFormat.read(path);
+	}
+
+	private void readWithSrgUtils(MappingTreeView tree, MappingFormat format, Map<String, String> nsAltMap) throws Exception {
+		IMappingFile.Format srgUtilsFormat = TestHelper.toSrgUtilsFormat(format);
+		if (srgUtilsFormat == null) return;
+
+		// SrgUtils can't handle empty dst names
+		VisitableMappingTree dstNsCompTree = new MemoryMappingTree();
+		tree.accept(new MappingNsCompleter(new ForwardingMappingVisitor(dstNsCompTree) {
+			@Override
+			public boolean visitElementContent(MappedElementKind targetKind) throws IOException {
+				// SrgUtil's Tiny v2 reader crashes on var sub-elements
+				return !(format == MappingFormat.TINY_2_FILE && targetKind == MappedElementKind.METHOD_VAR);
+			}
+		}, nsAltMap));
+
+		Path path = TestHelper.writeToDir(dstNsCompTree, dir, format);
+		INamedMappingFile.load(path.toFile());
+	}
 }