Insert underscores before digits

2 files changed, 2 insertions, 1 deletions

diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/util/Casing.java b/src/main/java/org/zwobble/hobgoblin/compiler/util/Casing.java
index 1b962a4..ac0871b 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/util/Casing.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/util/Casing.java
@@ -14,7 +14,7 @@ public class Casing {
 
         for (var characterIndex = 0; characterIndex < lowerCamelCase.length(); characterIndex++) {
             var character = lowerCamelCase.charAt(characterIndex);
-            if (Character.isUpperCase(character)) {
+            if (Character.isUpperCase(character) || Character.isDigit(character)) {
                 upperCase.append('_');
                 upperCase.append(character);
             } else {
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/util/CasingTests.java b/src/test/java/org/zwobble/hobgoblin/compiler/util/CasingTests.java
index 1441811..fbdf429 100644
--- a/src/test/java/org/zwobble/hobgoblin/compiler/util/CasingTests.java
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/util/CasingTests.java
@@ -13,6 +13,7 @@ public class CasingTests {
         "abc,ABC",
         "abcDef,ABC_DEF",
         "abDeFg,AB_DE_FG",
+        "a0,A_0",
     })
     public void lowerCamelCaseToUpperCase(String lowerCamelCase, String expectedUpperCase) {
         var result = Casing.lowerCamelCaseToUpperCase(lowerCamelCase);