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util.ts
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util.ts
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import {StringWrapper, isPresent, isBlank} from 'angular2/src/facade/lang';
import {DOM} from 'angular2/src/dom/dom_adapter';
import {ListWrapper} from 'angular2/src/facade/collection';
import {DomProtoView} from './view/proto_view';
import {DomElementBinder} from './view/element_binder';
import {TemplateCloner} from './template_cloner';
export const NG_BINDING_CLASS_SELECTOR = '.ng-binding';
export const NG_BINDING_CLASS = 'ng-binding';
export const EVENT_TARGET_SEPARATOR = ':';
export const NG_CONTENT_ELEMENT_NAME = 'ng-content';
export const NG_SHADOW_ROOT_ELEMENT_NAME = 'shadow-root';
const MAX_IN_MEMORY_ELEMENTS_PER_TEMPLATE = 20;
var CAMEL_CASE_REGEXP = /([A-Z])/g;
var DASH_CASE_REGEXP = /-([a-z])/g;
export function camelCaseToDashCase(input: string): string {
return StringWrapper.replaceAllMapped(input, CAMEL_CASE_REGEXP,
(m) => { return '-' + m[1].toLowerCase(); });
}
export function dashCaseToCamelCase(input: string): string {
return StringWrapper.replaceAllMapped(input, DASH_CASE_REGEXP,
(m) => { return m[1].toUpperCase(); });
}
// Attention: This is on the hot path, so don't use closures or default values!
export function queryBoundElements(templateContent: Node, isSingleElementChild: boolean):
Element[] {
var result;
var dynamicElementList;
var elementIdx = 0;
if (isSingleElementChild) {
var rootElement = DOM.firstChild(templateContent);
var rootHasBinding = DOM.hasClass(rootElement, NG_BINDING_CLASS);
dynamicElementList = DOM.getElementsByClassName(rootElement, NG_BINDING_CLASS);
result = ListWrapper.createFixedSize(dynamicElementList.length + (rootHasBinding ? 1 : 0));
if (rootHasBinding) {
result[elementIdx++] = rootElement;
}
} else {
dynamicElementList = DOM.querySelectorAll(templateContent, NG_BINDING_CLASS_SELECTOR);
result = ListWrapper.createFixedSize(dynamicElementList.length);
}
for (var i = 0; i < dynamicElementList.length; i++) {
result[elementIdx++] = dynamicElementList[i];
}
return result;
}
export class ClonedProtoView {
constructor(public original: DomProtoView, public fragments: Node[][],
public boundElements: Element[], public boundTextNodes: Node[]) {}
}
export function cloneAndQueryProtoView(templateCloner: TemplateCloner, pv: DomProtoView,
importIntoDocument: boolean): ClonedProtoView {
var templateContent = templateCloner.cloneContent(pv.cloneableTemplate, importIntoDocument);
var boundElements = queryBoundElements(templateContent, pv.isSingleElementFragment);
var boundTextNodes = queryBoundTextNodes(templateContent, pv.rootTextNodeIndices, boundElements,
pv.elementBinders, pv.boundTextNodeCount);
var fragments = queryFragments(templateContent, pv.fragmentsRootNodeCount);
return new ClonedProtoView(pv, fragments, boundElements, boundTextNodes);
}
function queryFragments(templateContent: Node, fragmentsRootNodeCount: number[]): Node[][] {
var fragments = ListWrapper.createGrowableSize(fragmentsRootNodeCount.length);
// Note: An explicit loop is the fastest way to convert a DOM array into a JS array!
var childNode = DOM.firstChild(templateContent);
for (var fragmentIndex = 0; fragmentIndex < fragments.length; fragmentIndex++) {
var fragment = ListWrapper.createFixedSize(fragmentsRootNodeCount[fragmentIndex]);
fragments[fragmentIndex] = fragment;
// Note: the 2nd, 3rd, ... fragments are separated by each other via a '|'
if (fragmentIndex >= 1) {
childNode = DOM.nextSibling(childNode);
}
for (var i = 0; i < fragment.length; i++) {
fragment[i] = childNode;
childNode = DOM.nextSibling(childNode);
}
}
return fragments;
}
function queryBoundTextNodes(templateContent: Node, rootTextNodeIndices: number[],
boundElements: Element[], elementBinders: DomElementBinder[],
boundTextNodeCount: number): Node[] {
var boundTextNodes = ListWrapper.createFixedSize(boundTextNodeCount);
var textNodeIndex = 0;
if (rootTextNodeIndices.length > 0) {
var rootChildNodes = DOM.childNodes(templateContent);
for (var i = 0; i < rootTextNodeIndices.length; i++) {
boundTextNodes[textNodeIndex++] = rootChildNodes[rootTextNodeIndices[i]];
}
}
for (var i = 0; i < elementBinders.length; i++) {
var binder = elementBinders[i];
var element: Node = boundElements[i];
if (binder.textNodeIndices.length > 0) {
var childNodes = DOM.childNodes(element);
for (var j = 0; j < binder.textNodeIndices.length; j++) {
boundTextNodes[textNodeIndex++] = childNodes[binder.textNodeIndices[j]];
}
}
}
return boundTextNodes;
}
export function isElementWithTag(node: Node, elementName: string): boolean {
return DOM.isElementNode(node) && DOM.tagName(node).toLowerCase() == elementName.toLowerCase();
}
export function queryBoundTextNodeIndices(parentNode: Node, boundTextNodes: Map<Node, any>,
resultCallback: Function) {
var childNodes = DOM.childNodes(parentNode);
for (var j = 0; j < childNodes.length; j++) {
var node = childNodes[j];
if (boundTextNodes.has(node)) {
resultCallback(node, j, boundTextNodes.get(node));
}
}
}
export function prependAll(parentNode: Node, nodes: Node[]) {
var lastInsertedNode = null;
nodes.forEach(node => {
if (isBlank(lastInsertedNode)) {
var firstChild = DOM.firstChild(parentNode);
if (isPresent(firstChild)) {
DOM.insertBefore(firstChild, node);
} else {
DOM.appendChild(parentNode, node);
}
} else {
DOM.insertAfter(lastInsertedNode, node);
}
lastInsertedNode = node;
});
}