From 540e5d609975ae466494d30a2d9e41b8b89fed16 Mon Sep 17 00:00:00 2001
From: Danila Fedorin <danila.fedorin@gmail.com>
Date: Sat, 16 Sep 2017 00:16:32 -0700
Subject: [PATCH 1/4] Load default implementation if one is not found.

---
 core/src/main/kotlin/org/nwapw/abacus/Abacus.kt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/core/src/main/kotlin/org/nwapw/abacus/Abacus.kt b/core/src/main/kotlin/org/nwapw/abacus/Abacus.kt
index 0363646..4b78256 100644
--- a/core/src/main/kotlin/org/nwapw/abacus/Abacus.kt
+++ b/core/src/main/kotlin/org/nwapw/abacus/Abacus.kt
@@ -68,6 +68,7 @@ class Abacus(val configuration: Configuration) {
         pluginManager.reload()
         with(mutableContext) {
             numberImplementation = pluginManager.numberImplementationFor(configuration.numberImplementation)
+                    ?: StandardPlugin.IMPLEMENTATION_NAIVE
             clearVariables()
             clearDefinitions()
         }

From 88e3bb710918a41041eb8cdef74426d5a85c42a9 Mon Sep 17 00:00:00 2001
From: Danila Fedorin <danila.fedorin@gmail.com>
Date: Sat, 16 Sep 2017 00:16:48 -0700
Subject: [PATCH 2/4] Remove unnecessary nullability from parseString.

---
 core/src/main/kotlin/org/nwapw/abacus/Abacus.kt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/src/main/kotlin/org/nwapw/abacus/Abacus.kt b/core/src/main/kotlin/org/nwapw/abacus/Abacus.kt
index 4b78256..4272aa8 100644
--- a/core/src/main/kotlin/org/nwapw/abacus/Abacus.kt
+++ b/core/src/main/kotlin/org/nwapw/abacus/Abacus.kt
@@ -88,7 +88,7 @@ class Abacus(val configuration: Configuration) {
      * @param input the input string to parse
      * @return the resulting tree, null if the tree builder or the produced tree are null.
      */
-    fun parseString(input: String): TreeNode? = treeBuilder.fromString(input)
+    fun parseString(input: String): TreeNode = treeBuilder.fromString(input)
     /**
      * Evaluates the given tree.
      *

From 0ff071e21251e0c353dd49912bbd33256daabc13 Mon Sep 17 00:00:00 2001
From: Danila Fedorin <danila.fedorin@gmail.com>
Date: Sat, 16 Sep 2017 00:17:03 -0700
Subject: [PATCH 3/4] Add a more complete .gitignore

---
 .gitignore | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/.gitignore b/.gitignore
index 724d50a..31e9878 100644
--- a/.gitignore
+++ b/.gitignore
@@ -24,7 +24,9 @@ hs_err_pid*
 # Custom Stuff
 # Gradle
 .gradle/*
-build/*
+**/build/*
+**/out/**
+**/.DS_Store
 
 # IntelliJ
 .idea/*

From 14ac9c67f4ccc24e227d1703edeb3cb958203abd Mon Sep 17 00:00:00 2001
From: Danila Fedorin <danila.fedorin@gmail.com>
Date: Sat, 16 Sep 2017 00:18:43 -0700
Subject: [PATCH 4/4] Implement the comparable interface.

---
 .../java/org/nwapw/abacus/number/NumberInterface.java  | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/core/src/main/java/org/nwapw/abacus/number/NumberInterface.java b/core/src/main/java/org/nwapw/abacus/number/NumberInterface.java
index 8727425..e37c4fb 100755
--- a/core/src/main/java/org/nwapw/abacus/number/NumberInterface.java
+++ b/core/src/main/java/org/nwapw/abacus/number/NumberInterface.java
@@ -5,7 +5,7 @@ import org.nwapw.abacus.exception.ComputationInterruptedException;
 /**
  * An interface used to represent a number.
  */
-public abstract class NumberInterface {
+public abstract class NumberInterface implements Comparable<NumberInterface> {
 
     /**
      * Check if the thread was interrupted and
@@ -158,14 +158,6 @@ public abstract class NumberInterface {
         return intPowInternal(exponent);
     }
 
-    /**
-     * Compares this number to another.
-     *
-     * @param number the number to compare to.
-     * @return same as Integer.compare();
-     */
-    public abstract int compareTo(NumberInterface number);
-
     /**
      * Same as Math.signum().
      *