Remap AT method descriptor

src/main/java/net/fabricmc/loom/util/srg/AtRemapper.java

@@ -33,9 +33,11 @@ import org.zeroturnaround.zip.transform.StringZipEntryTransformer;
 import org.zeroturnaround.zip.transform.ZipEntryTransformerEntry;
 
 import java.io.IOException;
+import java.io.StringReader;
 import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.function.UnaryOperator;
 import java.util.zip.ZipEntry;
 
 /**
@@ -59,7 +61,7 @@ public final class AtRemapper {
 						continue;
 					}
 					
-					String[] parts = line.split(" ");
+					String[] parts = line.split("\\s+");
 					if (parts.length < 2) {
 						logger.warn("Invalid AT Line: " + line);
 						output.add(i, line);
@@ -70,6 +72,16 @@ public final class AtRemapper {
 							mappings.getClasses(),
 							def -> def.getName("srg").equals(name)
 					).map(def -> def.getName("named")).orElse(name).replace('/', '.');
+					if (parts.length >= 3) {
+						if (parts[2].contains("(")) {
+							parts[2] = parts[2].substring(0, parts[2].indexOf('(')) + remapDescriptor(parts[2].substring(parts[2].indexOf('(')), s -> {
+								return CollectionUtil.find(
+										mappings.getClasses(),
+										def -> def.getName("srg").equals(s)
+								).map(def -> def.getName("named")).orElse(s);
+							});
+						}
+					}
 					
 					output.add(i, String.join(" ", parts));
 				}
@@ -78,4 +90,35 @@ public final class AtRemapper {
 			}
 		}))});
 	}
+	
+	private static String remapDescriptor(String original, UnaryOperator<String> classMappings) {
+		try {
+			StringReader reader = new StringReader(original);
+			StringBuilder result = new StringBuilder();
+			boolean insideClassName = false;
+			StringBuilder className = new StringBuilder();
+			while (true) {
+				int c = reader.read();
+				if (c == -1) {
+					break;
+				}
+				if ((char) c == ';') {
+					insideClassName = false;
+					result.append(classMappings.apply(className.toString()));
+				}
+				if (insideClassName) {
+					className.append((char) c);
+				} else {
+					result.append((char) c);
+				}
+				if (!insideClassName && (char) c == 'L') {
+					insideClassName = true;
+					className.setLength(0);
+				}
+			}
+			return result.toString();
+		} catch (IOException e) {
+			throw new AssertionError(e);
+		}
+	}
 }