Add yarn naming service that is injected to the game jar

If Forge can do it, so can I.

3 files changed, 179 insertions, 0 deletions

diff --git a/src/forgeInject/java/net/fabricmc/loom/inject/Pair.java b/src/forgeInject/java/net/fabricmc/loom/inject/Pair.java
new file mode 100644
index 00000000..0206cb5d
--- /dev/null
+++ b/src/forgeInject/java/net/fabricmc/loom/inject/Pair.java
@@ -0,0 +1,52 @@
+/*
+ * This file is part of fabric-loom, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) 2016, 2017, 2018 FabricMC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package net.fabricmc.loom.inject;
+
+import java.util.Map;
+
+final class Pair<A, B> implements Map.Entry<A, B> {
+	private final A first;
+	private final B second;
+
+	Pair(A first, B second) {
+		this.first = first;
+		this.second = second;
+	}
+
+	@Override
+	public A getKey() {
+		return first;
+	}
+
+	@Override
+	public B getValue() {
+		return second;
+	}
+
+	@Override
+	public B setValue(B value) {
+		throw new UnsupportedOperationException("Pairs are immutable!");
+	}
+}
diff --git a/src/forgeInject/java/net/fabricmc/loom/inject/YarnNamingService.java b/src/forgeInject/java/net/fabricmc/loom/inject/YarnNamingService.java
new file mode 100644
index 00000000..c9de6ed4
--- /dev/null
+++ b/src/forgeInject/java/net/fabricmc/loom/inject/YarnNamingService.java
@@ -0,0 +1,126 @@
+/*
+ * This file is part of fabric-loom, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) 2016, 2017, 2018 FabricMC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package net.fabricmc.loom.inject;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Map;
+import java.util.Optional;
+import java.util.function.BiFunction;
+import java.util.function.Predicate;
+
+import cpw.mods.modlauncher.api.INameMappingService;
+
+import net.fabricmc.mapping.tree.TinyMappingFactory;
+import net.fabricmc.mapping.tree.TinyTree;
+
+public class YarnNamingService implements INameMappingService {
+	private TinyTree mappings = null;
+
+	@Override
+	public String mappingName() {
+		return "srgtoyarn";
+	}
+
+	@Override
+	public String mappingVersion() {
+		return "1";
+	}
+
+	@Override
+	public Map.Entry<String, String> understanding() {
+		return new Pair<>("srg", "mcp");
+	}
+
+	@Override
+	public BiFunction<Domain, String, String> namingFunction() {
+		return this::remap;
+	}
+
+	private TinyTree getMappings() {
+		if (mappings != null) {
+			return mappings;
+		}
+
+		String pathStr = System.getProperty("loom.srgtoyarn.path");
+		if (pathStr == null) throw new RuntimeException("Missing system property 'loom.srgtoyarn.path'!");
+		Path path = Paths.get(pathStr);
+
+		try (BufferedReader reader = Files.newBufferedReader(path)) {
+			mappings = TinyMappingFactory.loadWithDetection(reader);
+		} catch (IOException e) {
+			throw new UncheckedIOException(e);
+		}
+
+		return mappings;
+	}
+
+	private String remap(Domain domain, String name) {
+		TinyTree mappings = getMappings();
+
+		switch (domain) {
+		case CLASS:
+			boolean dot = name.contains(".");
+			return find(mappings.getClasses(), def -> maybeReplace(dot, def.getName("srg"), '/', '.').equals(name))
+					.map(def -> maybeReplace(dot, def.getName("named"), '/', '.'))
+					.orElse(name);
+		case METHOD:
+			return mappings.getClasses().stream()
+					.flatMap(def -> def.getMethods().stream())
+					.filter(def -> def.getName("srg").equals(name))
+					.findAny()
+					.map(def -> def.getName("named"))
+					.orElse(name);
+		case FIELD:
+			return mappings.getClasses().stream()
+					.flatMap(def -> def.getFields().stream())
+					.filter(def -> def.getName("srg").equals(name))
+					.findAny()
+					.map(def -> def.getName("named"))
+					.orElse(name);
+		default:
+			return name;
+		}
+	}
+
+	// From CollectionUtil
+	private static <E> Optional<E> find(Iterable<? extends E> collection, Predicate<? super E> filter) {
+		for (E e : collection) {
+			if (filter.test(e)) {
+				return Optional.of(e);
+			}
+		}
+
+		return Optional.empty();
+	}
+
+	private static String maybeReplace(boolean run, String s, char from, char to) {
+		return run ? s.replace(from, to) : s;
+	}
+}
diff --git a/src/forgeInject/resources/META-INF/services/cpw.mods.modlauncher.api.INameMappingService b/src/forgeInject/resources/META-INF/services/cpw.mods.modlauncher.api.INameMappingService
new file mode 100644
index 00000000..45290566
--- /dev/null
+++ b/src/forgeInject/resources/META-INF/services/cpw.mods.modlauncher.api.INameMappingService
@@ -0,0 +1 @@
+net.fabricmc.loom.inject.YarnNamingService