Add zero parameter variant of CharSequence.codePointCount()

Author: cketti

CHANGELOG.md

@@ -6,6 +6,7 @@
 
 ### Added
 - `CodePoint.toUnicodeNotation()` returns the standard Unicode notation of a code point, e.g. `U+1F4E7`. 
+- `CharSequence.codePointCount()` variant without parameters.
 
 ## [0.8.0] - 2024-06-09
 ### Changed

kotlin-codepoints/src/commonMain/kotlin/CharSequenceExtensions.kt

@@ -76,6 +76,13 @@ fun CharSequence.codePointBefore(index: Int): Int {
     return firstChar.code
 }
 
+/**
+ * Returns the number of Unicode code points in this `CharSequence`.
+ */
+fun CharSequence.codePointCount(): Int {
+    return codePointCount(beginIndex = 0, endIndex = length)
+}
+
 /**
  * Returns the number of Unicode code points in the specified text range of this `CharSequence`.
  * 

kotlin-codepoints/src/commonTest/kotlin/CharSequenceExtensionsTest.kt

@@ -61,12 +61,17 @@ class CharSequenceExtensionsTest {
 
     @Test
     fun codePointCount() {
+        assertEquals(0, "".codePointCount())
         assertEquals(0, "".codePointCount(beginIndex = 0, endIndex = 0))
         assertEquals(0, "abc".codePointCount(beginIndex = 1, endIndex = 1))
 
+        assertEquals(3, "abc".codePointCount())
         assertEquals(3, "abc".codePointCount(beginIndex = 0, endIndex = 3))
+        assertEquals(2, "a\uFFFF".codePointCount())
         assertEquals(2, "a\uFFFF".codePointCount(beginIndex = 0, endIndex = 2))
+        assertEquals(1, "\uD83E\uDD95".codePointCount())
         assertEquals(1, "\uD83E\uDD95".codePointCount(beginIndex = 0, endIndex = 2))
+        assertEquals(2, "\uD83E\uDD95\uD83E\uDD96".codePointCount())
         assertEquals(2, "\uD83E\uDD95\uD83E\uDD96".codePointCount(beginIndex = 0, endIndex = 4))
 
         assertEquals(2, "abc".codePointCount(beginIndex = 1, endIndex = 3))
@@ -80,7 +85,9 @@ class CharSequenceExtensionsTest {
 
     @Test
     fun codePointCount_with_unmatched_surrogates() {
+        assertEquals(2, "\uDD95\uD83E".codePointCount())
         assertEquals(2, "\uDD95\uD83E".codePointCount(beginIndex = 0, endIndex = 2))
+        assertEquals(3, "\uDD95\uD83E\uDD95\uD83E".codePointCount())
         assertEquals(3, "\uDD95\uD83E\uDD95\uD83E".codePointCount(beginIndex = 0, endIndex = 4))
 
         assertEquals(1, "\uDD95\uD83E".codePointCount(beginIndex = 1, endIndex = 2))