[GR-9752] Missing list.clear method.

PullRequest: graalpython-open/36

Author: ppisl

graalpython/com.oracle.graal.python.test/src/tests/list_tests.py

@@ -447,7 +447,7 @@ def test_reverse(self):
         self.assertEqual(u, u2)
 
         self.assertRaises(TypeError, u.reverse, 42)
-
+    '''
     def test_clear(self):
         u = self.type2test([2, 3, 4])
         u.clear()
@@ -465,7 +465,6 @@ def test_clear(self):
 
         self.assertRaises(TypeError, u.clear, None)
 
-    '''
     def test_copy(self):
         u = self.type2test([1, 2, 3])
         v = u.copy()

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/list/ListBuiltins.java

@@ -71,6 +71,7 @@
 import com.oracle.graal.python.runtime.sequence.SequenceUtil.NormalizeIndexNode;
 import com.oracle.graal.python.runtime.sequence.storage.BasicSequenceStorage;
 import com.oracle.graal.python.runtime.sequence.storage.DoubleSequenceStorage;
+import com.oracle.graal.python.runtime.sequence.storage.EmptySequenceStorage;
 import com.oracle.graal.python.runtime.sequence.storage.IntSequenceStorage;
 import com.oracle.graal.python.runtime.sequence.storage.ListSequenceStorage;
 import com.oracle.graal.python.runtime.sequence.storage.LongSequenceStorage;
@@ -938,6 +939,21 @@ long count(PList self, Object value,
 
     }
 
+    // list.clear()
+    @Builtin(name = "clear", fixedNumOfArguments = 1)
+    @GenerateNodeFactory
+    public abstract static class ListClearNode extends PythonBuiltinNode {
+
+        @Specialization
+        public PNone clear(PList list) {
+            if (list.len() > 0) {
+                list.setSequenceStorage(new EmptySequenceStorage());
+            }
+            return PNone.NONE;
+        }
+
+    }
+
     // list.reverse()
     @Builtin(name = "reverse", fixedNumOfArguments = 1)
     @GenerateNodeFactory