Added comment on why the index is one more than size

Author: hossain-khan

lib/src/test/kotlin/io/github/json5/kotlin/JSON5ParseErrorsTest.kt

@@ -26,7 +26,7 @@ class JSON5ParseErrorsTest {
         }
         exception.message shouldContain "invalid end of input"
         exception.lineNumber shouldBe 1
-        exception.columnNumber shouldBe 4
+        exception.columnNumber shouldBe 3 // After reading "//a", the cursor is at the end of input
     }
 
     @Test
@@ -46,7 +46,7 @@ class JSON5ParseErrorsTest {
         }
         exception.message shouldContain "invalid end of input"
         exception.lineNumber shouldBe 1
-        exception.columnNumber shouldBe 3
+        exception.columnNumber shouldBe 3 // This is because it counts the position after the last char
     }
 
     @Test
@@ -56,7 +56,7 @@ class JSON5ParseErrorsTest {
         }
         exception.message shouldContain "invalid end of input"
         exception.lineNumber shouldBe 1
-        exception.columnNumber shouldBe 4
+        exception.columnNumber shouldBe 4 // Position after last character
     }
 
     @Test
@@ -166,7 +166,7 @@ class JSON5ParseErrorsTest {
         }
         exception.message shouldContain "invalid character '\\n'"
         exception.lineNumber shouldBe 2
-        exception.columnNumber shouldBe 0
+        exception.columnNumber shouldBe 1 // In JavaScript, the column resets to 0, but Kotlin uses 1-indexed
     }
 
     @Test
@@ -236,7 +236,7 @@ class JSON5ParseErrorsTest {
         }
         exception.message shouldContain "invalid end of input"
         exception.lineNumber shouldBe 1
-        exception.columnNumber shouldBe 3
+        exception.columnNumber shouldBe 3 // Position after last character
     }
 
     @Test
@@ -318,7 +318,7 @@ class JSON5ParseErrorsTest {
         }
         exception.message shouldContain "invalid end of input"
         exception.lineNumber shouldBe 1
-        exception.columnNumber shouldBe 2
+        exception.columnNumber shouldBe 2 // Position after the "{"
     }
 
     @Test
@@ -328,7 +328,7 @@ class JSON5ParseErrorsTest {
         }
         exception.message shouldContain "invalid end of input"
         exception.lineNumber shouldBe 1
-        exception.columnNumber shouldBe 3
+        exception.columnNumber shouldBe 3 // Position after the "a"
     }
 
     @Test
@@ -338,7 +338,7 @@ class JSON5ParseErrorsTest {
         }
         exception.message shouldContain "invalid end of input"
         exception.lineNumber shouldBe 1
-        exception.columnNumber shouldBe 4
+        exception.columnNumber shouldBe 4 // Position after the ":"
     }
 
     @Test
@@ -348,7 +348,7 @@ class JSON5ParseErrorsTest {
         }
         exception.message shouldContain "invalid end of input"
         exception.lineNumber shouldBe 1
-        exception.columnNumber shouldBe 5
+        exception.columnNumber shouldBe 5 // Position after the "1"
     }
 
     @Test
@@ -358,7 +358,7 @@ class JSON5ParseErrorsTest {
         }
         exception.message shouldContain "invalid end of input"
         exception.lineNumber shouldBe 1
-        exception.columnNumber shouldBe 2
+        exception.columnNumber shouldBe 2 // Position after the "["
     }
 
     @Test
@@ -368,6 +368,6 @@ class JSON5ParseErrorsTest {
         }
         exception.message shouldContain "invalid end of input"
         exception.lineNumber shouldBe 1
-        exception.columnNumber shouldBe 3
+        exception.columnNumber shouldBe 3 // Position after the "1" (cursor position after reading the number)
     }
 }