paulk-asert commented on code in PR #2215:
URL: https://github.com/apache/groovy/pull/2215#discussion_r2076523276
##########
src/main/java/org/codehaus/groovy/runtime/StringGroovyMethods.java:
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@@ -1877,6 +1878,77 @@ public static StringBuilder leftShift(final
StringBuilder self, final Object val
return self;
}
+
//--------------------------------------------------------------------------
+ // make StringBuilder behaves like a stack of chars
+
+ /**
+ * Since StringBuilder is a basic dynamic container of chars, sometimes it
should
+ * behave like a stack of chars at the same time.
+ * stack's methods should have: push(), peek(), pop(), size(), isEmpty()
+ * <pre class="groovyTestCase">
+ * def st = new StringBuilder()
+ * // stack in cases:
+ * st.push('B')
+ * assert st.toString() == 'B'
+ * st.push('a')
+ * assert st.toString() == 'Ba'
+ * st.push('r')
+ * assert st.toString() == 'Bar'
+ * assert st.size() == 3
+ * assert st.isEmpty() == false
+ * // stack out cases:
+ * assert st.peek() == 'r' as char
+ * assert st.pop() == 'r' as char
+ * assert st.toString() == 'Ba'
+ * assert st.peek() == 'a' as char
+ * assert st.pop() == 'a' as char
+ * assert st.toString() == 'B'
+ * assert st.size() == 1
+ * assert st.isEmpty() == false
Review Comment:
StringBuilder#isEmpty comes with JDK15.
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