feat(core): add initial view engine (#14014)

The new view engine allows our codegen to produce less code,
as it can interpret view definitions during runtime.

The view engine is not feature complete yet, but already
allows to implement a tree benchmark based on it.

Part of #14013

modules/@angular/core/src/view/text.ts

@@ -0,0 +1,147 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {looseIdentical} from '../facade/lang';
+
+import {BindingDef, BindingType, NodeData, NodeDef, NodeFlags, NodeType, Services, ViewData} from './types';
+import {checkAndUpdateBinding} from './util';
+
+export function textDef(constants: string[]): NodeDef {
+  const bindings: BindingDef[] = new Array(constants.length - 1);
+  for (let i = 1; i < constants.length; i++) {
+    bindings[i - 1] = {
+      type: BindingType.Interpolation,
+      name: undefined,
+      nonMinifiedName: undefined,
+      securityContext: undefined,
+      suffix: constants[i]
+    };
+  }
+  return {
+    type: NodeType.Text,
+    // will bet set by the view definition
+    index: undefined,
+    reverseChildIndex: undefined,
+    parent: undefined,
+    childFlags: undefined,
+    bindingIndex: undefined,
+    providerIndices: undefined,
+    // regular values
+    flags: 0,
+    childCount: 0, bindings,
+    element: undefined,
+    provider: undefined,
+    text: {prefix: constants[0]},
+    component: undefined,
+    template: undefined
+  };
+}
+
+export function createText(view: ViewData, renderHost: any, def: NodeDef): NodeData {
+  const parentNode = def.parent != null ? view.nodes[def.parent].renderNode : renderHost;
+  let renderNode: any;
+  if (view.renderer) {
+    renderNode = view.renderer.createText(parentNode, def.text.prefix);
+  } else {
+    renderNode = document.createTextNode(def.text.prefix);
+    if (parentNode) {
+      parentNode.appendChild(renderNode);
+    }
+  }
+  return {renderNode, provider: undefined, embeddedViews: undefined, componentView: undefined};
+}
+
+export function checkAndUpdateTextInline(
+    view: ViewData, def: NodeDef, v0: any, v1: any, v2: any, v3: any, v4: any, v5: any, v6: any,
+    v7: any, v8: any, v9: any) {
+  const bindings = def.bindings;
+  let changed = false;
+  // Note: fallthrough is intended!
+  switch (bindings.length) {
+    case 10:
+      if (checkAndUpdateBinding(view, def, 9, v9)) changed = true;
+    case 9:
+      if (checkAndUpdateBinding(view, def, 8, v8)) changed = true;
+    case 8:
+      if (checkAndUpdateBinding(view, def, 7, v7)) changed = true;
+    case 7:
+      if (checkAndUpdateBinding(view, def, 6, v6)) changed = true;
+    case 6:
+      if (checkAndUpdateBinding(view, def, 5, v5)) changed = true;
+    case 5:
+      if (checkAndUpdateBinding(view, def, 4, v4)) changed = true;
+    case 4:
+      if (checkAndUpdateBinding(view, def, 3, v3)) changed = true;
+    case 3:
+      if (checkAndUpdateBinding(view, def, 2, v2)) changed = true;
+    case 2:
+      if (checkAndUpdateBinding(view, def, 1, v1)) changed = true;
+    case 1:
+      if (checkAndUpdateBinding(view, def, 0, v0)) changed = true;
+  }
+
+  if (changed) {
+    let value = '';
+    // Note: fallthrough is intended!
+    switch (bindings.length) {
+      case 10:
+        value = _addInterpolationPart(v9, bindings[9]);
+      case 9:
+        value = _addInterpolationPart(v8, bindings[8]) + value;
+      case 8:
+        value = _addInterpolationPart(v7, bindings[7]) + value;
+      case 7:
+        value = _addInterpolationPart(v6, bindings[6]) + value;
+      case 6:
+        value = _addInterpolationPart(v5, bindings[5]) + value;
+      case 5:
+        value = _addInterpolationPart(v4, bindings[4]) + value;
+      case 4:
+        value = _addInterpolationPart(v3, bindings[3]) + value;
+      case 3:
+        value = _addInterpolationPart(v2, bindings[2]) + value;
+      case 2:
+        value = _addInterpolationPart(v1, bindings[1]) + value;
+      case 1:
+        value = _addInterpolationPart(v0, bindings[0]) + value;
+    }
+    value = def.text.prefix + value;
+    const renderNode = view.nodes[def.index].renderNode;
+    if (view.renderer) {
+      view.renderer.setText(renderNode, value);
+    } else {
+      renderNode.nodeValue = value;
+    }
+  }
+}
+
+export function checkAndUpdateTextDynamic(view: ViewData, def: NodeDef, values: any[]) {
+  const bindings = def.bindings;
+  let changed = view.firstChange;
+  for (let i = 0; i < values.length && !changed; i++) {
+    changed = changed || checkAndUpdateBinding(view, def, i, values[i]);
+  }
+  if (changed) {
+    let value = '';
+    for (let i = 0; i < values.length; i++) {
+      value = value + _addInterpolationPart(values[i], bindings[i]);
+    }
+    value = def.text.prefix + value;
+    const renderNode = view.nodes[def.index].renderNode;
+    if (view.renderer) {
+      view.renderer.setText(renderNode, value);
+    } else {
+      renderNode.nodeValue = value;
+    }
+  }
+}
+
+function _addInterpolationPart(value: any, binding: BindingDef): string {
+  const valueStr = value != null ? value.toString() : '';
+  return valueStr + binding.suffix;
+}