2 files changed, 142 insertions, 0 deletions
diff --git a/src/main/java/ftbsc/lll/mapper/utils/Mapper.java b/src/main/java/ftbsc/lll/mapper/utils/Mapper.java
new file mode 100644
index 0000000..b6e0722
--- /dev/null
+++ b/src/main/java/ftbsc/lll/mapper/utils/Mapper.java
@@ -0,0 +1,78 @@
+package ftbsc.lll.mapper.utils;
+
+import ftbsc.lll.exceptions.MappingNotFoundException;
+import ftbsc.lll.mapper.data.ClassData;
+import ftbsc.lll.mapper.data.FieldData;
+import ftbsc.lll.mapper.data.MethodData;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * An object containing parsed mapping data, which can
+ * apply a conversion as requested.
+ */
+public class Mapper {
+	/**
+	 * A {@link Map} tying each plain class name to its class data.
+	 */
+	protected final Map<String, ClassData> mappings = new HashMap<>();
+
+	/**
+	 * Gets the {@link ClassData} given the plain name.
+	 * @param name the plain internal name of the desired class
+	 * @return the mapped name of the class
+	 * @throws MappingNotFoundException if no mapping is found
+	 */
+	public ClassData getClassData(String name) throws MappingNotFoundException {
+		ClassData data = this.mappings.get(name.replace('.', '/'));
+		if(data == null)
+			throw new MappingNotFoundException("class", name);
+		else return data;
+	}
+
+	/**
+	 * Gets the mapped name of a method
+	 * @param parent the plain internal name of the parent class
+	 * @param name the plain method name
+	 * @param descriptor the descriptor of the method
+	 * @return the mapped name of the given member
+	 * @throws MappingNotFoundException if no mapping is found
+	 */
+	public MethodData getMethodData(String parent, String name, String descriptor) throws MappingNotFoundException {
+		return this.getClassData(parent).mapMethod(name, descriptor);
+	}
+
+	/**
+	 * Gets the mapped name of a field.
+	 * @param parent the plain internal name of the parent class
+	 * @param name the field's plain name
+	 * @return the mapped name of the requested field
+	 * @throws MappingNotFoundException if no mapping is found
+	 */
+	public FieldData getFieldData(String parent, String name) throws MappingNotFoundException {
+		return this.getClassData(parent).mapField(name);
+	}
+
+	/**
+	 * Gets the "raw mappings".
+	 * @return a {@link Map} tying each {@link ClassData} to the class' plain name
+	 */
+	public Map<String, ClassData> getRawMappings() {
+		return this.mappings;
+	}
+
+	/**
+	 * Builds a new {@link Mapper} that functions in reverse to this one (i.e. one that
+	 * considers as "mapped" what this one considers plain, and vice versa).
+	 * @return the inverted mapper
+	 */
+	public Mapper getInverted() {
+		Mapper inverted = new Mapper();
+		this.mappings.forEach((name, data) -> {
+			ClassData reverse = data.generateReverseMappings(this);
+			inverted.mappings.put(data.nameMapped, reverse);
+		});
+		return inverted;
+	}
+}
diff --git a/src/main/java/ftbsc/lll/mapper/utils/MappingUtils.java b/src/main/java/ftbsc/lll/mapper/utils/MappingUtils.java
new file mode 100644
index 0000000..ff7327c
--- /dev/null
+++ b/src/main/java/ftbsc/lll/mapper/utils/MappingUtils.java
@@ -0,0 +1,64 @@
+package ftbsc.lll.mapper.utils;
+
+import ftbsc.lll.exceptions.MappingNotFoundException;
+import ftbsc.lll.utils.DescriptorBuilder;
+import org.objectweb.asm.Type;
+
+/**
+ * A collection of static utility methods correlated to
+ * mappers.
+ */
+public class MappingUtils {
+
+	/**
+	 * Maps a method descriptor, replacing its class references with their mapped counterparts.
+	 * @param descriptor a {@link String} containing the descriptor
+	 * @param mapper the {@link Mapper} to use for the process
+	 * @param reverse if true it uses the inverted mapper rather than the normal one
+	 * @return the mapped descriptor
+	 */
+	public static String mapMethodDescriptor(String descriptor, Mapper mapper, boolean reverse) {
+		Type method = Type.getMethodType(descriptor);
+		Type[] arguments = method.getArgumentTypes();
+		Type returnType = method.getReturnType();
+
+		Type[] mappedArguents = new Type[arguments.length];
+		for(int i = 0; i < mappedArguents.length; i++)
+			mappedArguents[i] = mapType(arguments[i], mapper, reverse);
+
+		return Type.getMethodDescriptor(mapType(returnType, mapper, reverse), mappedArguents);
+	}
+
+	/**
+	 * Given a {@link Type} and a valid {@link Mapper} it returns its mapped counterpart.
+	 * @param type the type in question
+	 * @param mapper the {@link Mapper} to use for the process
+	 * @param reverse if true it uses the inverted mapper rather than the normal one
+	 * @return the mapped type
+	 */
+	public static Type mapType(Type type, Mapper mapper, boolean reverse) {
+		//unwrap arrays
+		Type unwrapped = type;
+		int arrayLevel = 0;
+		while(unwrapped.getSort() == Type.ARRAY) {
+			unwrapped = unwrapped.getElementType();
+			arrayLevel++;
+		}
+
+		//if it's a primitive no operation is needed
+		if(type.getSort() < Type.ARRAY)
+			return type;
+
+		String internalName = type.getInternalName();
+
+		String internalNameMapped;
+		try {
+			internalNameMapped = reverse
+				? mapper.getInverted().getClassData(internalName).nameMapped
+				: mapper.getClassData(internalName).nameMapped;
+			return Type.getType(DescriptorBuilder.nameToDescriptor(internalNameMapped, arrayLevel));
+		} catch(MappingNotFoundException e) {
+			return type;
+		}
+	}
+}