feat: added SrgMapper, which parses a .tsrg file and uses it for converting between MCP and SRG

src/main/java/ftbsc/lll/tools/SrgMapper.java

@@ -0,0 +1,163 @@
+package ftbsc.lll.tools;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.stream.Stream;
+
+/**
+ * Parses a .tsrg file into a mapper capable of converting from
+ * deobfuscated names to srg names.
+ * Obviously, it may only be used at runtime if the .tsrg file is
+ * included in the resources. However, in that case, I'd recommend
+ * using the built-in Forge one and refrain from including an extra
+ * resource for no good reason.
+ * @since 0.2.0
+ */
+public class SrgMapper {
+
+	/**
+	 * A Map using the deobfuscated names as keys,
+	 * holding information for that Srg class as value.
+	 */
+	private final Map<String, ObfuscationData> mapper = new HashMap<>();
+
+	/**
+	 * The public constructor.
+	 * Should be passed a Stream of Strings, one representing each line.
+	 * Whether they contain line endings or not is irrelevant.
+	 * @param str a Stream of strings
+	 */
+	public SrgMapper(Stream<String> str) {
+		AtomicReference<String> currentClass = new AtomicReference<>("");
+		str.forEach(l -> {
+			if(l.startsWith("\t"))
+				mapper.get(currentClass.get()).addMember(l);
+			else {
+				ObfuscationData s = new ObfuscationData(l);
+				currentClass.set(s.mcpName);
+				mapper.put(s.mcpName, s);
+			}
+		});
+	}
+
+	/**
+	 * Gets the SRG-obfuscated name of the class.
+	 * @param mcp the MCP (deobfuscated) internal name of the desired class
+	 * @return the SRG name of the class, or null if it wasn't found
+	 */
+	public String getSrgClass(String mcp)  {
+		ObfuscationData data = mapper.get(mcp);
+		return data == null ? null : data.srgName;
+	}
+
+	/**
+	 * Gets the SRG-obfuscated name of a class member (field or method).
+	 * The method signature must be in this format: "methodName methodDescriptor",
+	 * with a space, because that's how it is in .tsrg files.
+	 * @param mcpClass the MCP (deobfuscated) internal name of the container class
+	 * @param member the field name or method signature
+	 * @return the SRG name of the given member, or null if it wasn't found
+	 */
+	public String getSrgMember(String mcpClass, String member) {
+		ObfuscationData data = mapper.get(mcpClass);
+		if(data == null)
+			return null;
+		return data.members.get(member);
+	}
+
+	/**
+	 * Used internally. Gets the obfuscation data corresponding to the given SRG name.
+	 * @return the desired ObfuscationData object, or null if it wasn't found
+	 */
+	private ObfuscationData getObfuscationData(String srg) {
+		for(ObfuscationData s : mapper.values())
+			if(s.srgName.equals(srg))
+				return s;
+		return null;
+	}
+
+	/**
+	 * Gets the MCP (deobfuscated) name of the class.
+	 * Due to how it's implemented, it's considerably less efficient than its
+	 * opposite operation.
+	 * @param srg the SRG-obfuscated internal name of the desired class
+	 * @return the MCP name of the class, or null if it wasn't found
+	 */
+	public String getMcpClass(String srg) {
+		ObfuscationData data = getObfuscationData(srg);
+		return data == null ? null : data.mcpName;
+	}
+
+	/**
+	 * Gets the MCP (deobfuscated) name of the given member.
+	 * Due to how it's implemented, it's considerably less efficient than its
+	 * opposite operation.
+	 * @param srgClass the SRG-obfuscated internal name of the container class
+	 * @param member the field name or method signature
+	 * @return the MCP name of the given member, or null if it wasn't found
+	 */
+	public String getMcpMember(String srgClass, String member) {
+		ObfuscationData data = getObfuscationData(srgClass);
+		if(data == null)
+			return null;
+		for(String mcp : data.members.keySet())
+			if(data.members.get(mcp).equals(member))
+				return mcp;
+		return null;
+	}
+
+	/**
+	 * Private class used internally for storing information about each
+	 * class. It's private because there is no good reason anyone would
+	 * want to access this outside of this class.
+	 */
+	private static class ObfuscationData {
+		/**
+		 * The MCP internal name (FQN with '/' instad of '.') of the class.
+		 */
+		private final String mcpName;
+
+		/**
+		 * The SRG internal name (FQN with '/' instad of '.') of the class.
+		 */
+		private final String srgName;
+
+		/**
+		 * A Map tying each member's deobfuscatede name or signature to its
+		 * SRG name.
+		 */
+		private final Map<String, String> members;
+
+
+		/**
+		 * The constructor. It takes in the line where the class is declared,
+		 * which looks something like this:
+		 * {@code internal/name/mcp internal/name/srg }
+		 * @param s the String represeting the declaration line
+		 */
+		private ObfuscationData(String s) {
+			String[] split = s.trim().split(" ");
+			this.mcpName = split[0];
+			this.srgName = split[1];
+			this.members = new HashMap<>();
+		}
+
+		/**
+		 * Adds a member to the target class. It takes in the line where the
+		 * member is declared.
+		 * For fields it looks like this:
+		 * {@code fieldMcpName field_srg_name}
+		 * For methods it looks like this:
+		 * {@code methodName methodDescriptor method_srg_name}
+		 * @param s the String representing the declaration line
+		 */
+		public void addMember(String s) {
+			String[] split = s.trim().split(" ");
+			if(split.length == 2) //field
+				members.put(split[0], split[1]);
+			else if (split.length == 3) //method
+				members.put(split[0] + split[1], split[2]);
+		}
+	}
+}