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Unified Diff: pkg/analysis_server/test/index/btree_test.dart

Issue 314413004: A simple B+Tree implementation. (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: tweaks Created 6 years, 6 months ago
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Index: pkg/analysis_server/test/index/btree_test.dart
diff --git a/pkg/analysis_server/test/index/btree_test.dart b/pkg/analysis_server/test/index/btree_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..eb77812a648b1795eea08db4476d4185dd85e1f4
--- /dev/null
+++ b/pkg/analysis_server/test/index/btree_test.dart
@@ -0,0 +1,676 @@
+// Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library test.index.btree;
+
+import 'dart:math';
+
+import 'package:analysis_server/src/index/btree.dart';
+import 'package:unittest/unittest.dart';
+
+import '../reflective_tests.dart';
+
+
+main() {
+ groupSep = ' | ';
+ group('BTree', () {
+ runReflectiveTests(BTreeTest);
+ });
+}
+
+
+void _assertDebugString(BTree tree, String expected) {
+ String dump = _getDebugString(tree);
+ expect(dump, expected);
+}
+
+
+String _getDebugString(BTree tree) {
+ StringBuffer buffer = new StringBuffer();
+ tree.writeOn(buffer);
+ return buffer.toString();
+}
+
+
+int _intComparator(int a, int b) => a - b;
+
+
+@ReflectiveTestCase()
+class BTreeTest {
+ BTree<int, String> tree = new BTree<int, String>(4, 4, _intComparator);
+
+ test_NoSuchMethodError() {
+ expect(() {
+ (tree as dynamic).thereIsNoSuchMethod();
+ }, throwsA(new isInstanceOf<NoSuchMethodError>()));
+ }
+
+ void test_find() {
+ _insertValues(12);
+ expect(tree.find(-1), isNull);
+ expect(tree.find(1000), isNull);
+ for (int key = 0; key < 12; key++) {
+ expect(tree.find(key), 'V$key');
+ }
+ }
+
+ void test_insert_01() {
+ _insert(0, 'A');
+ _assertDebugString(tree, 'LNode {0: A}\n');
+ }
+
+ void test_insert_02() {
+ _insert(1, 'B');
+ _insert(0, 'A');
+ _assertDebugString(tree, 'LNode {0: A, 1: B}\n');
+ }
+
+ void test_insert_03() {
+ _insert(2, 'C');
+ _insert(0, 'A');
+ _insert(1, 'B');
+ _assertDebugString(tree, 'LNode {0: A, 1: B, 2: C}\n');
+ }
+
+ void test_insert_05() {
+ _insertValues(5);
+ _assertDebugString(tree, '''
+INode {
+ LNode {0: V0, 1: V1}
+ 2
+ LNode {2: V2, 3: V3, 4: V4}
+}
+''');
+ }
+
+ void test_insert_09() {
+ _insertValues(9);
+ _assertDebugString(tree, '''
+INode {
+ LNode {0: V0, 1: V1}
+ 2
+ LNode {2: V2, 3: V3}
+ 4
+ LNode {4: V4, 5: V5}
+ 6
+ LNode {6: V6, 7: V7, 8: V8}
+}
+''');
+ }
+
+ void test_insert_innerSplitLeft() {
+ // Prepare a tree with '0' key missing.
+ for (int i = 1; i < 12; i++) {
+ _insert(i, "V$i");
+ }
+ _assertDebugString(tree, '''
+INode {
+ LNode {1: V1, 2: V2}
+ 3
+ LNode {3: V3, 4: V4}
+ 5
+ LNode {5: V5, 6: V6}
+ 7
+ LNode {7: V7, 8: V8}
+ 9
+ LNode {9: V9, 10: V10, 11: V11}
+}
+''');
+ // Split and insert into the 'left' child.
+ _insert(0, 'V0');
+ _assertDebugString(tree, '''
+INode {
+ INode {
+ LNode {0: V0, 1: V1, 2: V2}
+ 3
+ LNode {3: V3, 4: V4}
+ 5
+ LNode {5: V5, 6: V6}
+ }
+ 7
+ INode {
+ LNode {7: V7, 8: V8}
+ 9
+ LNode {9: V9, 10: V10, 11: V11}
+ }
+}
+''');
+ }
+
+ void test_insert_innerSplitRight() {
+ _insertValues(12);
+ _assertDebugString(tree, '''
+INode {
+ INode {
+ LNode {0: V0, 1: V1}
+ 2
+ LNode {2: V2, 3: V3}
+ 4
+ LNode {4: V4, 5: V5}
+ }
+ 6
+ INode {
+ LNode {6: V6, 7: V7}
+ 8
+ LNode {8: V8, 9: V9, 10: V10, 11: V11}
+ }
+}
+''');
+ }
+
+ void test_insert_replace() {
+ _insert(0, 'A');
+ _insert(1, 'B');
+ _insert(2, 'C');
+ _assertDebugString(tree, 'LNode {0: A, 1: B, 2: C}\n');
+ _insert(2, 'C2');
+ _insert(1, 'B2');
+ _insert(0, 'A2');
+ _assertDebugString(tree, 'LNode {0: A2, 1: B2, 2: C2}\n');
+ }
+
+ void test_remove_inner_borrowLeft() {
+ tree = new BTree<int, String>(10, 4, _intComparator);
+ for (int i = 100; i < 125; i++) {
+ _insert(i, 'V$i');
+ }
+ for (int i = 0; i < 10; i++) {
+ _insert(i, 'V$i');
+ }
+ _assertDebugString(tree, '''
+INode {
+ INode {
+ LNode {0: V0, 1: V1}
+ 2
+ LNode {2: V2, 3: V3}
+ 4
+ LNode {4: V4, 5: V5}
+ 6
+ LNode {6: V6, 7: V7}
+ 8
+ LNode {8: V8, 9: V9, 100: V100, 101: V101}
+ 102
+ LNode {102: V102, 103: V103}
+ 104
+ LNode {104: V104, 105: V105}
+ 106
+ LNode {106: V106, 107: V107}
+ 108
+ LNode {108: V108, 109: V109}
+ 110
+ LNode {110: V110, 111: V111}
+ }
+ 112
+ INode {
+ LNode {112: V112, 113: V113}
+ 114
+ LNode {114: V114, 115: V115}
+ 116
+ LNode {116: V116, 117: V117}
+ 118
+ LNode {118: V118, 119: V119}
+ 120
+ LNode {120: V120, 121: V121}
+ 122
+ LNode {122: V122, 123: V123, 124: V124}
+ }
+}
+''');
+ expect(tree.remove(112), 'V112');
+ _assertDebugString(tree, '''
+INode {
+ INode {
+ LNode {0: V0, 1: V1}
+ 2
+ LNode {2: V2, 3: V3}
+ 4
+ LNode {4: V4, 5: V5}
+ 6
+ LNode {6: V6, 7: V7}
+ 8
+ LNode {8: V8, 9: V9, 100: V100, 101: V101}
+ 102
+ LNode {102: V102, 103: V103}
+ 104
+ LNode {104: V104, 105: V105}
+ }
+ 106
+ INode {
+ LNode {106: V106, 107: V107}
+ 108
+ LNode {108: V108, 109: V109}
+ 110
+ LNode {110: V110, 111: V111}
+ 112
+ LNode {113: V113, 114: V114, 115: V115}
+ 116
+ LNode {116: V116, 117: V117}
+ 118
+ LNode {118: V118, 119: V119}
+ 120
+ LNode {120: V120, 121: V121}
+ 122
+ LNode {122: V122, 123: V123, 124: V124}
+ }
+}
+''');
+ }
+
+ void test_remove_inner_borrowRight() {
+ tree = new BTree<int, String>(10, 4, _intComparator);
+ for (int i = 100; i < 135; i++) {
+ _insert(i, 'V$i');
+ }
+ _assertDebugString(tree, '''
+INode {
+ INode {
+ LNode {100: V100, 101: V101}
+ 102
+ LNode {102: V102, 103: V103}
+ 104
+ LNode {104: V104, 105: V105}
+ 106
+ LNode {106: V106, 107: V107}
+ 108
+ LNode {108: V108, 109: V109}
+ 110
+ LNode {110: V110, 111: V111}
+ }
+ 112
+ INode {
+ LNode {112: V112, 113: V113}
+ 114
+ LNode {114: V114, 115: V115}
+ 116
+ LNode {116: V116, 117: V117}
+ 118
+ LNode {118: V118, 119: V119}
+ 120
+ LNode {120: V120, 121: V121}
+ 122
+ LNode {122: V122, 123: V123}
+ 124
+ LNode {124: V124, 125: V125}
+ 126
+ LNode {126: V126, 127: V127}
+ 128
+ LNode {128: V128, 129: V129}
+ 130
+ LNode {130: V130, 131: V131}
+ 132
+ LNode {132: V132, 133: V133, 134: V134}
+ }
+}
+''');
+ expect(tree.remove(100), 'V100');
+ _assertDebugString(tree, '''
+INode {
+ INode {
+ LNode {101: V101, 102: V102, 103: V103}
+ 104
+ LNode {104: V104, 105: V105}
+ 106
+ LNode {106: V106, 107: V107}
+ 108
+ LNode {108: V108, 109: V109}
+ 110
+ LNode {110: V110, 111: V111}
+ 112
+ LNode {112: V112, 113: V113}
+ 114
+ LNode {114: V114, 115: V115}
+ 116
+ LNode {116: V116, 117: V117}
+ }
+ 118
+ INode {
+ LNode {118: V118, 119: V119}
+ 120
+ LNode {120: V120, 121: V121}
+ 122
+ LNode {122: V122, 123: V123}
+ 124
+ LNode {124: V124, 125: V125}
+ 126
+ LNode {126: V126, 127: V127}
+ 128
+ LNode {128: V128, 129: V129}
+ 130
+ LNode {130: V130, 131: V131}
+ 132
+ LNode {132: V132, 133: V133, 134: V134}
+ }
+}
+''');
+ }
+
+ void test_remove_inner_mergeLeft() {
+ _insertValues(15);
+ _assertDebugString(tree, '''
+INode {
+ INode {
+ LNode {0: V0, 1: V1}
+ 2
+ LNode {2: V2, 3: V3}
+ 4
+ LNode {4: V4, 5: V5}
+ }
+ 6
+ INode {
+ LNode {6: V6, 7: V7}
+ 8
+ LNode {8: V8, 9: V9}
+ 10
+ LNode {10: V10, 11: V11}
+ 12
+ LNode {12: V12, 13: V13, 14: V14}
+ }
+}
+''');
+ expect(tree.remove(12), 'V12');
+ expect(tree.remove(13), 'V13');
+ expect(tree.remove(14), 'V14');
+ _assertDebugString(tree, '''
+INode {
+ INode {
+ LNode {0: V0, 1: V1}
+ 2
+ LNode {2: V2, 3: V3}
+ 4
+ LNode {4: V4, 5: V5}
+ }
+ 6
+ INode {
+ LNode {6: V6, 7: V7}
+ 8
+ LNode {8: V8, 9: V9}
+ 10
+ LNode {10: V10, 11: V11}
+ }
+}
+''');
+ expect(tree.remove(8), 'V8');
+ _assertDebugString(tree, '''
+INode {
+ LNode {0: V0, 1: V1}
+ 2
+ LNode {2: V2, 3: V3}
+ 4
+ LNode {4: V4, 5: V5}
+ 6
+ LNode {6: V6, 7: V7, 9: V9}
+ 10
+ LNode {10: V10, 11: V11}
+}
+''');
+ }
+
+ void test_remove_inner_mergeRight() {
+ _insertValues(12);
+ _assertDebugString(tree, '''
+INode {
+ INode {
+ LNode {0: V0, 1: V1}
+ 2
+ LNode {2: V2, 3: V3}
+ 4
+ LNode {4: V4, 5: V5}
+ }
+ 6
+ INode {
+ LNode {6: V6, 7: V7}
+ 8
+ LNode {8: V8, 9: V9, 10: V10, 11: V11}
+ }
+}
+''');
+ expect(tree.remove(0), 'V0');
+ _assertDebugString(tree, '''
+INode {
+ LNode {1: V1, 2: V2, 3: V3}
+ 4
+ LNode {4: V4, 5: V5}
+ 6
+ LNode {6: V6, 7: V7}
+ 8
+ LNode {8: V8, 9: V9, 10: V10, 11: V11}
+}
+''');
+ }
+
+ void test_remove_inner_notFound() {
+ _insertValues(20);
+ expect(tree.remove(100), isNull);
+ }
+
+ void test_remove_leafRoot_becomesEmpty() {
+ _insertValues(1);
+ _assertDebugString(tree, 'LNode {0: V0}\n');
+ expect(tree.remove(0), 'V0');
+ _assertDebugString(tree, 'LNode {}\n');
+ }
+
+ void test_remove_leafRoot_first() {
+ _insertValues(3);
+ _assertDebugString(tree, 'LNode {0: V0, 1: V1, 2: V2}\n');
+ expect(tree.remove(0), 'V0');
+ _assertDebugString(tree, 'LNode {1: V1, 2: V2}\n');
+ }
+
+ void test_remove_leafRoot_last() {
+ _insertValues(3);
+ _assertDebugString(tree, 'LNode {0: V0, 1: V1, 2: V2}\n');
+ expect(tree.remove(2), 'V2');
+ _assertDebugString(tree, 'LNode {0: V0, 1: V1}\n');
+ }
+
+ void test_remove_leafRoot_middle() {
+ _insertValues(3);
+ _assertDebugString(tree, 'LNode {0: V0, 1: V1, 2: V2}\n');
+ expect(tree.remove(1), 'V1');
+ _assertDebugString(tree, 'LNode {0: V0, 2: V2}\n');
+ }
+
+ void test_remove_leafRoot_notFound() {
+ _insertValues(1);
+ _assertDebugString(tree, 'LNode {0: V0}\n');
+ expect(tree.remove(10), null);
+ _assertDebugString(tree, 'LNode {0: V0}\n');
+ }
+
+ void test_remove_leaf_borrowLeft() {
+ tree = new BTree<int, String>(10, 10, _intComparator);
+ for (int i = 20; i < 40; i++) {
+ _insert(i, 'V$i');
+ }
+ for (int i = 0; i < 5; i++) {
+ _insert(i, 'V$i');
+ }
+ _assertDebugString(tree, '''
+INode {
+ LNode {0: V0, 1: V1, 2: V2, 3: V3, 4: V4, 20: V20, 21: V21, 22: V22, 23: V23, 24: V24}
+ 25
+ LNode {25: V25, 26: V26, 27: V27, 28: V28, 29: V29}
+ 30
+ LNode {30: V30, 31: V31, 32: V32, 33: V33, 34: V34, 35: V35, 36: V36, 37: V37, 38: V38, 39: V39}
+}
+''');
+ expect(tree.remove(25), 'V25');
+ _assertDebugString(tree, '''
+INode {
+ LNode {0: V0, 1: V1, 2: V2, 3: V3, 4: V4, 20: V20, 21: V21}
+ 22
+ LNode {22: V22, 23: V23, 24: V24, 26: V26, 27: V27, 28: V28, 29: V29}
+ 30
+ LNode {30: V30, 31: V31, 32: V32, 33: V33, 34: V34, 35: V35, 36: V36, 37: V37, 38: V38, 39: V39}
+}
+''');
+ }
+
+ void test_remove_leaf_borrowRight() {
+ tree = new BTree<int, String>(10, 10, _intComparator);
+ _insertValues(15);
+ _assertDebugString(tree, '''
+INode {
+ LNode {0: V0, 1: V1, 2: V2, 3: V3, 4: V4}
+ 5
+ LNode {5: V5, 6: V6, 7: V7, 8: V8, 9: V9, 10: V10, 11: V11, 12: V12, 13: V13, 14: V14}
+}
+''');
+ expect(tree.remove(0), 'V0');
+ _assertDebugString(tree, '''
+INode {
+ LNode {1: V1, 2: V2, 3: V3, 4: V4, 5: V5, 6: V6, 7: V7}
+ 8
+ LNode {8: V8, 9: V9, 10: V10, 11: V11, 12: V12, 13: V13, 14: V14}
+}
+''');
+ }
+
+ void test_remove_leaf_mergeLeft() {
+ _insertValues(9);
+ _assertDebugString(tree, '''
+INode {
+ LNode {0: V0, 1: V1}
+ 2
+ LNode {2: V2, 3: V3}
+ 4
+ LNode {4: V4, 5: V5}
+ 6
+ LNode {6: V6, 7: V7, 8: V8}
+}
+''');
+ expect(tree.remove(2), 'V2');
+ _assertDebugString(tree, '''
+INode {
+ LNode {0: V0, 1: V1, 3: V3}
+ 4
+ LNode {4: V4, 5: V5}
+ 6
+ LNode {6: V6, 7: V7, 8: V8}
+}
+''');
+ }
+
+ void test_remove_leaf_mergeRight() {
+ _insertValues(9);
+ _assertDebugString(tree, '''
+INode {
+ LNode {0: V0, 1: V1}
+ 2
+ LNode {2: V2, 3: V3}
+ 4
+ LNode {4: V4, 5: V5}
+ 6
+ LNode {6: V6, 7: V7, 8: V8}
+}
+''');
+ expect(tree.remove(1), 'V1');
+ _assertDebugString(tree, '''
+INode {
+ LNode {0: V0, 2: V2, 3: V3}
+ 4
+ LNode {4: V4, 5: V5}
+ 6
+ LNode {6: V6, 7: V7, 8: V8}
+}
+''');
+ }
+
+ void test_remove_leaf_noReorder() {
+ _insertValues(5);
+ _assertDebugString(tree, '''
+INode {
+ LNode {0: V0, 1: V1}
+ 2
+ LNode {2: V2, 3: V3, 4: V4}
+}
+''');
+ expect(tree.remove(3), 'V3');
+ _assertDebugString(tree, '''
+INode {
+ LNode {0: V0, 1: V1}
+ 2
+ LNode {2: V2, 4: V4}
+}
+''');
+ }
+
+ void test_stress_evenOdd() {
+ int count = 1000;
+ // insert odd, forward
+ for (int i = 1; i < count; i += 2) {
+ _insert(i, 'V$i');
+ }
+ // insert even, backward
+ for (int i = count - 2; i >= 0; i -= 2) {
+ _insert(i, 'V$i');
+ }
+ // find every
+ for (int i = 0; i < count; i++) {
+ expect(tree.find(i), 'V$i');
+ }
+ // remove odd, backward
+ for (int i = count - 1; i >= 1; i -= 2) {
+ expect(tree.remove(i), 'V$i');
+ }
+ for (int i = 0; i < count; i++) {
+ if (i.isEven) {
+ expect(tree.find(i), 'V$i');
+ } else {
+ expect(tree.find(i), isNull);
+ }
+ }
+ // remove even, forward
+ for (int i = 0; i < count; i += 2) {
+ tree.remove(i);
+ }
+ for (int i = 0; i < count; i++) {
+ expect(tree.find(i), isNull);
+ }
+ }
+
+ void test_stress_random() {
+ tree = new BTree<int, String>(10, 10, _intComparator);
+ int maxKey = 1000000;
+ int tryCount = 1000;
+ Set<int> keys = new Set<int>();
+ {
+ Random random = new Random();
+ for (int i = 0; i < tryCount; i++) {
+ int key = random.nextInt(maxKey);
+ keys.add(key);
+ _insert(key, 'V$key');
+ }
+ }
+ // find every
+ for (int key in keys) {
+ expect(tree.find(key), 'V$key');
+ }
+ // remove random keys
+ {
+ Random random = new Random();
+ for (int key in new Set<int>.from(keys)) {
+ if (random.nextBool()) {
+ keys.remove(key);
+ expect(tree.remove(key), 'V$key');
+ }
+ }
+ }
+ // find every remaining key
+ for (int key in keys) {
+ expect(tree.find(key), 'V$key');
+ }
+ }
+
+ void _insert(int key, String value) {
+ tree.insert(key, value);
+ }
+
+ void _insertValues(int count) {
+ for (int i = 0; i < count; i++) {
+ _insert(i, 'V$i');
+ }
+ }
+}
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