angular2/es6/dev/src/render/dom/compiler/view_splitter.map

Angular 2 - a web framework for modern web apps

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{isBlank, isPresent, BaseException, StringWrapper} from 'angular2/src/facade/lang';\nimport {DOM} from 'angular2/src/dom/dom_adapter';\nimport {MapWrapper, ListWrapper} from 'angular2/src/facade/collection';\nimport {Parser} from 'angular2/change_detection';\n\nimport {CompileStep} from './compile_step';\nimport {CompileElement} from './compile_element';\nimport {CompileControl} from './compile_control';\n\nimport {dashCaseToCamelCase} from '../util';\n\n/**\n * Splits views at `<template>` elements or elements with `template` attribute:\n * For `<template>` elements:\n * - moves the content into a new and disconnected `<template>` element\n *   that is marked as view root.\n *\n * For elements with a `template` attribute:\n * - replaces the element with an empty `<template>` element,\n *   parses the content of the `template` attribute and adds the information to that\n *   `<template>` element. Marks the elements as view root.\n *\n * Note: In both cases the root of the nested view is disconnected from its parent element.\n * This is needed for browsers that don't support the `<template>` element\n * as we want to do locate elements with bindings using `getElementsByClassName` later on,\n * which should not descend into the nested view.\n */\nexport class ViewSplitter extends CompileStep {\n  _parser:Parser;\n\n  constructor(parser:Parser) {\n    super();\n    this._parser = parser;\n  }\n\n  process(parent:CompileElement, current:CompileElement, control:CompileControl) {\n    var attrs = current.attrs();\n    var templateBindings = MapWrapper.get(attrs, 'template');\n    var hasTemplateBinding = isPresent(templateBindings);\n\n    // look for template shortcuts such as *if=\"condition\" and treat them as template=\"if condition\"\n    MapWrapper.forEach(attrs, (attrValue, attrName) => {\n      if (StringWrapper.startsWith(attrName, '*')) {\n        var key = StringWrapper.substring(attrName, 1);  // remove the star\n        if (hasTemplateBinding) {\n          // 2nd template binding detected\n          throw new BaseException(`Only one template directive per element is allowed: ` +\n            `${templateBindings} and ${key} cannot be used simultaneously ` +\n            `in ${current.elementDescription}`);\n        } else {\n          templateBindings = (attrValue.length == 0) ? key : key + ' ' + attrValue;\n          hasTemplateBinding = true;\n        }\n      }\n    });\n\n    if (isPresent(parent)) {\n      if (DOM.isTemplateElement(current.element)) {\n        if (!current.isViewRoot) {\n          var viewRoot = new CompileElement(DOM.createTemplate(''));\n          viewRoot.inheritedProtoView = current.bindElement().bindNestedProtoView(viewRoot.element);\n          // viewRoot doesn't appear in the original template, so we associate\n          // the current element description to get a more meaningful message in case of error\n          viewRoot.elementDescription = current.elementDescription;\n          viewRoot.isViewRoot = true;\n\n          this._moveChildNodes(DOM.content(current.element), DOM.content(viewRoot.element));\n          control.addChild(viewRoot);\n        }\n      } if (hasTemplateBinding) {\n        var newParent = new CompileElement(DOM.createTemplate(''));\n        newParent.inheritedProtoView = current.inheritedProtoView;\n        newParent.inheritedElementBinder = current.inheritedElementBinder;\n        newParent.distanceToInheritedBinder = current.distanceToInheritedBinder;\n        // newParent doesn't appear in the original template, so we associate\n        // the current element description to get a more meaningful message in case of error\n        newParent.elementDescription = current.elementDescription;\n\n        current.inheritedProtoView = newParent.bindElement().bindNestedProtoView(current.element);\n        current.inheritedElementBinder = null;\n        current.distanceToInheritedBinder = 0;\n        current.isViewRoot = true;\n        this._parseTemplateBindings(templateBindings, newParent);\n\n        this._addParentElement(current.element, newParent.element);\n        control.addParent(newParent);\n        DOM.remove(current.element);\n      }\n    }\n  }\n\n  _moveChildNodes(source, target) {\n    var next = DOM.firstChild(source);\n    while (isPresent(next)) {\n      DOM.appendChild(target, next);\n      next = DOM.firstChild(source);\n    }\n  }\n\n  _addParentElement(currentElement, newParentElement) {\n    DOM.insertBefore(currentElement, newParentElement);\n    DOM.appendChild(newParentElement, currentElement);\n  }\n\n  _parseTemplateBindings(templateBindings:string, compileElement:CompileElement) {\n    var bindings = this._parser.parseTemplateBindings(templateBindings, compileElement.elementDescription);\n    for (var i=0; i<bindings.length; i++) {\n      var binding = bindings[i];\n      if (binding.keyIsVar) {\n        compileElement.bindElement().bindVariable(\n          dashCaseToCamelCase(binding.key), binding.name\n        );\n        MapWrapper.set(compileElement.attrs(), binding.key, binding.name);\n      } else if (isPresent(binding.expression)) {\n        compileElement.bindElement().bindProperty(\n          dashCaseToCamelCase(binding.key), binding.expression\n        );\n        MapWrapper.set(compileElement.attrs(), binding.key, binding.expression.source);\n      } else {\n        DOM.setAttribute(compileElement.element, binding.key, '');\n      }\n    }\n  }\n}\n"]}