fix: added empty predicates edge case to find function, and single-instruction constructor to InsnSequence

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

@@ -19,6 +19,16 @@ public class InsnSequence extends InsnList {
 		super();
 	}
 
+	/**
+	 * Public constructor for list with single item.
+	 * Must be given a single non-null node.
+	 * @param node the node in question
+	 */
+	public InsnSequence(AbstractInsnNode node) {
+		super();
+		super.add(node);
+	}
+
 	/**
 	 * Public constructor.
 	 * Must be given two non-null, connected nodes.

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

@@ -85,26 +85,26 @@ public class PatternMatcher {
 				if(ignoreLabels && cur.getType() == AbstractInsnNode.LABEL) continue;
 				if(ignoreFrames && cur.getType() == AbstractInsnNode.FRAME) continue;
 				if(ignoreLineNumbers && cur.getType() == AbstractInsnNode.LINE) continue;
+				if(predicates.get(match) != null) {
 					if(predicates.get(match).test(cur)) {
 						match++;
-					if(first == null)
+						if (first == null)
 							first = cur;
 					} else { //reset
 						first = null;
 						match = 0;
 					}
+				}
 				//check if we found the last one
 				if(match == predicates.size()) {
+					if(match == 0)
+						return new InsnSequence(cur); //match whatever
 					last = cur;
-					break;
-				}
-			}
-			//only return value if we found both a start and an end
-			if(first != null && last != null) {
 					if(reverse) return new InsnSequence(last, first); //we are matching backwards
 					else return new InsnSequence(first, last);
 				}
 			}
+		}
 		throw new PatternNotFoundException("Failed to find pattern!");
 	}