dart:html perf optimization based on runing Dromaeo benchmarks

samples/third_party/dromaeo/tests/dom-query-htmlfast.dart

+#library("dom_query");
+#import("dart:html");
+#import('../common/common.dart');
+#import('runner.dart');
+
+void main() {
+  final int num = 40;
+
+  // Try to force real results.
+  var ret;
+
+  String html = document.body.innerHTML;
+
+  new Suite(window, 'dom-query')
+    .prep(() {
+      html = BenchUtil.replaceAll(html, 'id="test(\\w).*?"', (Match match) {
+        final group = match.group(1);
+        return 'id="test${group}${num}"';
+      });
+      html = BenchUtil.replaceAll(html, 'name="test.*?"', (Match match) {
+        return 'name="test${num}"';
+      });
+      html = BenchUtil.replaceAll(html, 'class="foo.*?"', (Match match) {
+        return 'class="foo test${num} bar"';
+      });
+      final div = new Element.tag('div');
+      div.innerHTML = html;
+      document.body.$dom_appendChild(div);
+    })
+    .test('getElementById', () {
+      for (int i = 0; i < num * 30; i++) {
+        ret = document.$dom_getElementById('testA$num').hidden;
+        ret = document.$dom_getElementById('testB$num').hidden;
+        ret = document.$dom_getElementById('testC$num').hidden;
+        ret = document.$dom_getElementById('testD$num').hidden;
+        ret = document.$dom_getElementById('testE$num').hidden;
+        ret = document.$dom_getElementById('testF$num').hidden;
+      }
+    })
+    .test('getElementById (not in document)', () {
+      for (int i = 0; i < num * 30; i++) {
+        ret = document.$dom_getElementById('testA');
+        ret = document.$dom_getElementById('testB');
+        ret = document.$dom_getElementById('testC');
+        ret = document.$dom_getElementById('testD');
+        ret = document.$dom_getElementById('testE');
+        ret = document.$dom_getElementById('testF');
+      }
+    })
+    .test('getElementsByTagName(div)', () {
+      for (int i = 0; i < num; i++) {
+        final elems = document.$dom_getElementsByTagName('div');
+        for (int j = 0, len = elems.length; j < len; j++) {
+          ret = elems[j].hidden;
+        }
+      }
+    })
+    .test('getElementsByTagName(p)', () {
+      for (int i = 0; i < num; i++) {
+        final elems = document.$dom_getElementsByTagName('p');
+        for (int j = 0, len = elems.length; j < len; j++) {
+          ret = elems[j].hidden;
+        }
+      }
+    })
+    .test('getElementsByTagName(a)', () {
+      for (int i = 0; i < num; i++) {
+        final elems = document.$dom_getElementsByTagName('a');
+        for (int j = 0, len = elems.length; j < len; j++) {
+          ret = elems[j].hidden;
+        }
+      }
+    })
+    .test('getElementsByTagName(*)', () {
+      for (int i = 0; i < num; i++) {
+        var elems = document.$dom_getElementsByTagName('*');
+        for (int j = 0, len = elems.length; j < len; j++) {
+          ret = elems[j].hidden;
+        }
+      }
+    })
+    .test('getElementsByTagName (not in document)', () {
+      for (int i = 0; i < num; i++) {
+        final elems = document.$dom_getElementsByTagName('strong');
+        for (int j = 0, len = elems.length; j < len; j++) {
+          ret = elems[j].hidden;
+        }
+      }
+    })
+    .test('getElementsByName', () {
+      for (int i = 0; i < num * 20; i++) {
+        var elems = document.$dom_getElementsByName('test$num');
+        ret = elems[elems.length-1].nodeType;
+        elems = document.$dom_getElementsByName('test$num');
+        ret = elems[elems.length-1].nodeType;
+        elems = document.$dom_getElementsByName('test$num');
+        ret = elems[elems.length-1].nodeType;
+        elems = document.$dom_getElementsByName('test$num');
+        ret = elems[elems.length-1].nodeType;
+      }
+    })
+    .test('getElementsByName (not in document)', () {
+      for (int i = 0; i < num * 20; i++) {
+        ret = document.$dom_getElementsByName('test').length == 0;
+        ret = document.$dom_getElementsByName('test').length == 0;
+        ret = document.$dom_getElementsByName('test').length == 0;
+        ret = document.$dom_getElementsByName('test').length == 0;
+        ret = document.$dom_getElementsByName('test').length == 0;
+      }
+    })
+    .end();
+}