angular2
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Angular 2 - a web framework for modern web apps
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JavaScript
import { isPresent, StringWrapper } from 'angular2/src/facade/lang';
import { ListWrapper, StringMapWrapper, SetWrapper } from 'angular2/src/facade/collection';
import * as o from '../output/output_ast';
import { Identifiers, identifierToken } from '../identifiers';
import { ViewConstructorVars, InjectMethodVars, DetectChangesVars, ViewTypeEnum, ViewEncapsulationEnum, ChangeDetectionStrategyEnum, ViewProperties } from './constants';
import { ChangeDetectionStrategy, isDefaultChangeDetectionStrategy } from 'angular2/src/core/change_detection/change_detection';
import { CompileView } from './compile_view';
import { CompileElement, CompileNode } from './compile_element';
import { templateVisitAll } from '../template_ast';
import { getViewFactoryName, createFlatArray, createDiTokenExpression } from './util';
import { ViewType } from 'angular2/src/core/linker/view_type';
import { ViewEncapsulation } from 'angular2/src/core/metadata/view';
import { CompileIdentifierMetadata } from '../compile_metadata';
const IMPLICIT_TEMPLATE_VAR = '\$implicit';
const CLASS_ATTR = 'class';
const STYLE_ATTR = 'style';
var parentRenderNodeVar = o.variable('parentRenderNode');
var rootSelectorVar = o.variable('rootSelector');
export class ViewCompileDependency {
constructor(comp, factoryPlaceholder) {
this.comp = comp;
this.factoryPlaceholder = factoryPlaceholder;
}
}
export function buildView(view, template, targetDependencies) {
var builderVisitor = new ViewBuilderVisitor(view, targetDependencies);
templateVisitAll(builderVisitor, template, view.declarationElement.isNull() ?
view.declarationElement :
view.declarationElement.parent);
return builderVisitor.nestedViewCount;
}
export function finishView(view, targetStatements) {
view.afterNodes();
createViewTopLevelStmts(view, targetStatements);
view.nodes.forEach((node) => {
if (node instanceof CompileElement && node.hasEmbeddedView) {
finishView(node.embeddedView, targetStatements);
}
});
}
class ViewBuilderVisitor {
constructor(view, targetDependencies) {
this.view = view;
this.targetDependencies = targetDependencies;
this.nestedViewCount = 0;
}
_isRootNode(parent) { return parent.view !== this.view; }
_addRootNodeAndProject(node, ngContentIndex, parent) {
var vcAppEl = (node instanceof CompileElement && node.hasViewContainer) ? node.appElement : null;
if (this._isRootNode(parent)) {
// store appElement as root node only for ViewContainers
if (this.view.viewType !== ViewType.COMPONENT) {
this.view.rootNodesOrAppElements.push(isPresent(vcAppEl) ? vcAppEl : node.renderNode);
}
}
else if (isPresent(parent.component) && isPresent(ngContentIndex)) {
parent.addContentNode(ngContentIndex, isPresent(vcAppEl) ? vcAppEl : node.renderNode);
}
}
_getParentRenderNode(parent) {
if (this._isRootNode(parent)) {
if (this.view.viewType === ViewType.COMPONENT) {
return parentRenderNodeVar;
}
else {
// root node of an embedded/host view
return o.NULL_EXPR;
}
}
else {
return isPresent(parent.component) &&
parent.component.template.encapsulation !== ViewEncapsulation.Native ?
o.NULL_EXPR :
parent.renderNode;
}
}
visitBoundText(ast, parent) {
return this._visitText(ast, '', ast.ngContentIndex, parent);
}
visitText(ast, parent) {
return this._visitText(ast, ast.value, ast.ngContentIndex, parent);
}
_visitText(ast, value, ngContentIndex, parent) {
var fieldName = `_text_${this.view.nodes.length}`;
this.view.fields.push(new o.ClassField(fieldName, o.importType(this.view.genConfig.renderTypes.renderText), [o.StmtModifier.Private]));
var renderNode = o.THIS_EXPR.prop(fieldName);
var compileNode = new CompileNode(parent, this.view, this.view.nodes.length, renderNode, ast);
var createRenderNode = o.THIS_EXPR.prop(fieldName)
.set(ViewProperties.renderer.callMethod('createText', [
this._getParentRenderNode(parent),
o.literal(value),
this.view.createMethod.resetDebugInfoExpr(this.view.nodes.length, ast)
]))
.toStmt();
this.view.nodes.push(compileNode);
this.view.createMethod.addStmt(createRenderNode);
this._addRootNodeAndProject(compileNode, ngContentIndex, parent);
return renderNode;
}
visitNgContent(ast, parent) {
// the projected nodes originate from a different view, so we don't
// have debug information for them...
this.view.createMethod.resetDebugInfo(null, ast);
var parentRenderNode = this._getParentRenderNode(parent);
var nodesExpression = ViewProperties.projectableNodes.key(o.literal(ast.index), new o.ArrayType(o.importType(this.view.genConfig.renderTypes.renderNode)));
if (parentRenderNode !== o.NULL_EXPR) {
this.view.createMethod.addStmt(ViewProperties.renderer.callMethod('projectNodes', [
parentRenderNode,
o.importExpr(Identifiers.flattenNestedViewRenderNodes)
.callFn([nodesExpression])
])
.toStmt());
}
else if (this._isRootNode(parent)) {
if (this.view.viewType !== ViewType.COMPONENT) {
// store root nodes only for embedded/host views
this.view.rootNodesOrAppElements.push(nodesExpression);
}
}
else {
if (isPresent(parent.component) && isPresent(ast.ngContentIndex)) {
parent.addContentNode(ast.ngContentIndex, nodesExpression);
}
}
return null;
}
visitElement(ast, parent) {
var nodeIndex = this.view.nodes.length;
var createRenderNodeExpr;
var debugContextExpr = this.view.createMethod.resetDebugInfoExpr(nodeIndex, ast);
if (nodeIndex === 0 && this.view.viewType === ViewType.HOST) {
createRenderNodeExpr = o.THIS_EXPR.callMethod('selectOrCreateHostElement', [o.literal(ast.name), rootSelectorVar, debugContextExpr]);
}
else {
createRenderNodeExpr = ViewProperties.renderer.callMethod('createElement', [this._getParentRenderNode(parent), o.literal(ast.name), debugContextExpr]);
}
var fieldName = `_el_${nodeIndex}`;
this.view.fields.push(new o.ClassField(fieldName, o.importType(this.view.genConfig.renderTypes.renderElement), [o.StmtModifier.Private]));
this.view.createMethod.addStmt(o.THIS_EXPR.prop(fieldName).set(createRenderNodeExpr).toStmt());
var renderNode = o.THIS_EXPR.prop(fieldName);
var component = ast.getComponent();
var directives = ast.directives.map(directiveAst => directiveAst.directive);
var htmlAttrs = _readHtmlAttrs(ast.attrs);
var attrNameAndValues = _mergeHtmlAndDirectiveAttrs(htmlAttrs, directives);
for (var i = 0; i < attrNameAndValues.length; i++) {
var attrName = attrNameAndValues[i][0];
var attrValue = attrNameAndValues[i][1];
this.view.createMethod.addStmt(ViewProperties.renderer.callMethod('setElementAttribute', [renderNode, o.literal(attrName), o.literal(attrValue)])
.toStmt());
}
var compileElement = new CompileElement(parent, this.view, nodeIndex, renderNode, ast, component, directives, ast.providers, ast.hasViewContainer, false, ast.references);
this.view.nodes.push(compileElement);
var compViewExpr = null;
if (isPresent(component)) {
var nestedComponentIdentifier = new CompileIdentifierMetadata({ name: getViewFactoryName(component, 0) });
this.targetDependencies.push(new ViewCompileDependency(component, nestedComponentIdentifier));
compViewExpr = o.variable(`compView_${nodeIndex}`);
compileElement.setComponentView(compViewExpr);
this.view.createMethod.addStmt(compViewExpr.set(o.importExpr(nestedComponentIdentifier)
.callFn([
ViewProperties.viewUtils,
compileElement.injector,
compileElement.appElement
]))
.toDeclStmt());
}
compileElement.beforeChildren();
this._addRootNodeAndProject(compileElement, ast.ngContentIndex, parent);
templateVisitAll(this, ast.children, compileElement);
compileElement.afterChildren(this.view.nodes.length - nodeIndex - 1);
if (isPresent(compViewExpr)) {
var codeGenContentNodes;
if (this.view.component.type.isHost) {
codeGenContentNodes = ViewProperties.projectableNodes;
}
else {
codeGenContentNodes = o.literalArr(compileElement.contentNodesByNgContentIndex.map(nodes => createFlatArray(nodes)));
}
this.view.createMethod.addStmt(compViewExpr.callMethod('create', [codeGenContentNodes, o.NULL_EXPR]).toStmt());
}
return null;
}
visitEmbeddedTemplate(ast, parent) {
var nodeIndex = this.view.nodes.length;
var fieldName = `_anchor_${nodeIndex}`;
this.view.fields.push(new o.ClassField(fieldName, o.importType(this.view.genConfig.renderTypes.renderComment), [o.StmtModifier.Private]));
this.view.createMethod.addStmt(o.THIS_EXPR.prop(fieldName)
.set(ViewProperties.renderer.callMethod('createTemplateAnchor', [
this._getParentRenderNode(parent),
this.view.createMethod.resetDebugInfoExpr(nodeIndex, ast)
]))
.toStmt());
var renderNode = o.THIS_EXPR.prop(fieldName);
var templateVariableBindings = ast.variables.map(varAst => [varAst.value.length > 0 ? varAst.value : IMPLICIT_TEMPLATE_VAR, varAst.name]);
var directives = ast.directives.map(directiveAst => directiveAst.directive);
var compileElement = new CompileElement(parent, this.view, nodeIndex, renderNode, ast, null, directives, ast.providers, ast.hasViewContainer, true, ast.references);
this.view.nodes.push(compileElement);
this.nestedViewCount++;
var embeddedView = new CompileView(this.view.component, this.view.genConfig, this.view.pipeMetas, o.NULL_EXPR, this.view.viewIndex + this.nestedViewCount, compileElement, templateVariableBindings);
this.nestedViewCount += buildView(embeddedView, ast.children, this.targetDependencies);
compileElement.beforeChildren();
this._addRootNodeAndProject(compileElement, ast.ngContentIndex, parent);
compileElement.afterChildren(0);
return null;
}
visitAttr(ast, ctx) { return null; }
visitDirective(ast, ctx) { return null; }
visitEvent(ast, eventTargetAndNames) {
return null;
}
visitReference(ast, ctx) { return null; }
visitVariable(ast, ctx) { return null; }
visitDirectiveProperty(ast, context) { return null; }
visitElementProperty(ast, context) { return null; }
}
function _mergeHtmlAndDirectiveAttrs(declaredHtmlAttrs, directives) {
var result = {};
StringMapWrapper.forEach(declaredHtmlAttrs, (value, key) => { result[key] = value; });
directives.forEach(directiveMeta => {
StringMapWrapper.forEach(directiveMeta.hostAttributes, (value, name) => {
var prevValue = result[name];
result[name] = isPresent(prevValue) ? mergeAttributeValue(name, prevValue, value) : value;
});
});
return mapToKeyValueArray(result);
}
function _readHtmlAttrs(attrs) {
var htmlAttrs = {};
attrs.forEach((ast) => { htmlAttrs[ast.name] = ast.value; });
return htmlAttrs;
}
function mergeAttributeValue(attrName, attrValue1, attrValue2) {
if (attrName == CLASS_ATTR || attrName == STYLE_ATTR) {
return `${attrValue1} ${attrValue2}`;
}
else {
return attrValue2;
}
}
function mapToKeyValueArray(data) {
var entryArray = [];
StringMapWrapper.forEach(data, (value, name) => { entryArray.push([name, value]); });
// We need to sort to get a defined output order
// for tests and for caching generated artifacts...
ListWrapper.sort(entryArray, (entry1, entry2) => StringWrapper.compare(entry1[0], entry2[0]));
var keyValueArray = [];
entryArray.forEach((entry) => { keyValueArray.push([entry[0], entry[1]]); });
return keyValueArray;
}
function createViewTopLevelStmts(view, targetStatements) {
var nodeDebugInfosVar = o.NULL_EXPR;
if (view.genConfig.genDebugInfo) {
nodeDebugInfosVar = o.variable(`nodeDebugInfos_${view.component.type.name}${view.viewIndex}`);
targetStatements.push(nodeDebugInfosVar
.set(o.literalArr(view.nodes.map(createStaticNodeDebugInfo), new o.ArrayType(new o.ExternalType(Identifiers.StaticNodeDebugInfo), [o.TypeModifier.Const])))
.toDeclStmt(null, [o.StmtModifier.Final]));
}
var renderCompTypeVar = o.variable(`renderType_${view.component.type.name}`);
if (view.viewIndex === 0) {
targetStatements.push(renderCompTypeVar.set(o.NULL_EXPR)
.toDeclStmt(o.importType(Identifiers.RenderComponentType)));
}
var viewClass = createViewClass(view, renderCompTypeVar, nodeDebugInfosVar);
targetStatements.push(viewClass);
targetStatements.push(createViewFactory(view, viewClass, renderCompTypeVar));
}
function createStaticNodeDebugInfo(node) {
var compileElement = node instanceof CompileElement ? node : null;
var providerTokens = [];
var componentToken = o.NULL_EXPR;
var varTokenEntries = [];
if (isPresent(compileElement)) {
providerTokens = compileElement.getProviderTokens();
if (isPresent(compileElement.component)) {
componentToken = createDiTokenExpression(identifierToken(compileElement.component.type));
}
StringMapWrapper.forEach(compileElement.referenceTokens, (token, varName) => {
varTokenEntries.push([varName, isPresent(token) ? createDiTokenExpression(token) : o.NULL_EXPR]);
});
}
return o.importExpr(Identifiers.StaticNodeDebugInfo)
.instantiate([
o.literalArr(providerTokens, new o.ArrayType(o.DYNAMIC_TYPE, [o.TypeModifier.Const])),
componentToken,
o.literalMap(varTokenEntries, new o.MapType(o.DYNAMIC_TYPE, [o.TypeModifier.Const]))
], o.importType(Identifiers.StaticNodeDebugInfo, null, [o.TypeModifier.Const]));
}
function createViewClass(view, renderCompTypeVar, nodeDebugInfosVar) {
var emptyTemplateVariableBindings = view.templateVariableBindings.map((entry) => [entry[0], o.NULL_EXPR]);
var viewConstructorArgs = [
new o.FnParam(ViewConstructorVars.viewUtils.name, o.importType(Identifiers.ViewUtils)),
new o.FnParam(ViewConstructorVars.parentInjector.name, o.importType(Identifiers.Injector)),
new o.FnParam(ViewConstructorVars.declarationEl.name, o.importType(Identifiers.AppElement))
];
var viewConstructor = new o.ClassMethod(null, viewConstructorArgs, [
o.SUPER_EXPR.callFn([
o.variable(view.className),
renderCompTypeVar,
ViewTypeEnum.fromValue(view.viewType),
o.literalMap(emptyTemplateVariableBindings),
ViewConstructorVars.viewUtils,
ViewConstructorVars.parentInjector,
ViewConstructorVars.declarationEl,
ChangeDetectionStrategyEnum.fromValue(getChangeDetectionMode(view)),
nodeDebugInfosVar
])
.toStmt()
]);
var viewMethods = [
new o.ClassMethod('createInternal', [new o.FnParam(rootSelectorVar.name, o.STRING_TYPE)], generateCreateMethod(view), o.importType(Identifiers.AppElement)),
new o.ClassMethod('injectorGetInternal', [
new o.FnParam(InjectMethodVars.token.name, o.DYNAMIC_TYPE),
// Note: Can't use o.INT_TYPE here as the method in AppView uses number
new o.FnParam(InjectMethodVars.requestNodeIndex.name, o.NUMBER_TYPE),
new o.FnParam(InjectMethodVars.notFoundResult.name, o.DYNAMIC_TYPE)
], addReturnValuefNotEmpty(view.injectorGetMethod.finish(), InjectMethodVars.notFoundResult), o.DYNAMIC_TYPE),
new o.ClassMethod('detectChangesInternal', [new o.FnParam(DetectChangesVars.throwOnChange.name, o.BOOL_TYPE)], generateDetectChangesMethod(view)),
new o.ClassMethod('dirtyParentQueriesInternal', [], view.dirtyParentQueriesMethod.finish()),
new o.ClassMethod('destroyInternal', [], view.destroyMethod.finish())
].concat(view.eventHandlerMethods);
var viewClass = new o.ClassStmt(view.className, o.importExpr(Identifiers.AppView, [getContextType(view)]), view.fields, view.getters, viewConstructor, viewMethods.filter((method) => method.body.length > 0));
return viewClass;
}
function createViewFactory(view, viewClass, renderCompTypeVar) {
var viewFactoryArgs = [
new o.FnParam(ViewConstructorVars.viewUtils.name, o.importType(Identifiers.ViewUtils)),
new o.FnParam(ViewConstructorVars.parentInjector.name, o.importType(Identifiers.Injector)),
new o.FnParam(ViewConstructorVars.declarationEl.name, o.importType(Identifiers.AppElement))
];
var initRenderCompTypeStmts = [];
var templateUrlInfo;
if (view.component.template.templateUrl == view.component.type.moduleUrl) {
templateUrlInfo =
`${view.component.type.moduleUrl} class ${view.component.type.name} - inline template`;
}
else {
templateUrlInfo = view.component.template.templateUrl;
}
if (view.viewIndex === 0) {
initRenderCompTypeStmts = [
new o.IfStmt(renderCompTypeVar.identical(o.NULL_EXPR), [
renderCompTypeVar.set(ViewConstructorVars
.viewUtils.callMethod('createRenderComponentType', [
o.literal(templateUrlInfo),
o.literal(view.component
.template.ngContentSelectors.length),
ViewEncapsulationEnum
.fromValue(view.component.template.encapsulation),
view.styles
]))
.toStmt()
])
];
}
return o.fn(viewFactoryArgs, initRenderCompTypeStmts.concat([
new o.ReturnStatement(o.variable(viewClass.name)
.instantiate(viewClass.constructorMethod.params.map((param) => o.variable(param.name))))
]), o.importType(Identifiers.AppView, [getContextType(view)]))
.toDeclStmt(view.viewFactory.name, [o.StmtModifier.Final]);
}
function generateCreateMethod(view) {
var parentRenderNodeExpr = o.NULL_EXPR;
var parentRenderNodeStmts = [];
if (view.viewType === ViewType.COMPONENT) {
parentRenderNodeExpr = ViewProperties.renderer.callMethod('createViewRoot', [o.THIS_EXPR.prop('declarationAppElement').prop('nativeElement')]);
parentRenderNodeStmts = [
parentRenderNodeVar.set(parentRenderNodeExpr)
.toDeclStmt(o.importType(view.genConfig.renderTypes.renderNode), [o.StmtModifier.Final])
];
}
var resultExpr;
if (view.viewType === ViewType.HOST) {
resultExpr = view.nodes[0].appElement;
}
else {
resultExpr = o.NULL_EXPR;
}
return parentRenderNodeStmts.concat(view.createMethod.finish())
.concat([
o.THIS_EXPR.callMethod('init', [
createFlatArray(view.rootNodesOrAppElements),
o.literalArr(view.nodes.map(node => node.renderNode)),
o.literalArr(view.disposables),
o.literalArr(view.subscriptions)
])
.toStmt(),
new o.ReturnStatement(resultExpr)
]);
}
function generateDetectChangesMethod(view) {
var stmts = [];
if (view.detectChangesInInputsMethod.isEmpty() && view.updateContentQueriesMethod.isEmpty() &&
view.afterContentLifecycleCallbacksMethod.isEmpty() &&
view.detectChangesRenderPropertiesMethod.isEmpty() &&
view.updateViewQueriesMethod.isEmpty() && view.afterViewLifecycleCallbacksMethod.isEmpty()) {
return stmts;
}
ListWrapper.addAll(stmts, view.detectChangesInInputsMethod.finish());
stmts.push(o.THIS_EXPR.callMethod('detectContentChildrenChanges', [DetectChangesVars.throwOnChange])
.toStmt());
var afterContentStmts = view.updateContentQueriesMethod.finish().concat(view.afterContentLifecycleCallbacksMethod.finish());
if (afterContentStmts.length > 0) {
stmts.push(new o.IfStmt(o.not(DetectChangesVars.throwOnChange), afterContentStmts));
}
ListWrapper.addAll(stmts, view.detectChangesRenderPropertiesMethod.finish());
stmts.push(o.THIS_EXPR.callMethod('detectViewChildrenChanges', [DetectChangesVars.throwOnChange])
.toStmt());
var afterViewStmts = view.updateViewQueriesMethod.finish().concat(view.afterViewLifecycleCallbacksMethod.finish());
if (afterViewStmts.length > 0) {
stmts.push(new o.IfStmt(o.not(DetectChangesVars.throwOnChange), afterViewStmts));
}
var varStmts = [];
var readVars = o.findReadVarNames(stmts);
if (SetWrapper.has(readVars, DetectChangesVars.changed.name)) {
varStmts.push(DetectChangesVars.changed.set(o.literal(true)).toDeclStmt(o.BOOL_TYPE));
}
if (SetWrapper.has(readVars, DetectChangesVars.changes.name)) {
varStmts.push(DetectChangesVars.changes.set(o.NULL_EXPR)
.toDeclStmt(new o.MapType(o.importType(Identifiers.SimpleChange))));
}
if (SetWrapper.has(readVars, DetectChangesVars.valUnwrapper.name)) {
varStmts.push(DetectChangesVars.valUnwrapper.set(o.importExpr(Identifiers.ValueUnwrapper).instantiate([]))
.toDeclStmt(null, [o.StmtModifier.Final]));
}
return varStmts.concat(stmts);
}
function addReturnValuefNotEmpty(statements, value) {
if (statements.length > 0) {
return statements.concat([new o.ReturnStatement(value)]);
}
else {
return statements;
}
}
function getContextType(view) {
var typeMeta = view.component.type;
return typeMeta.isHost ? o.DYNAMIC_TYPE : o.importType(typeMeta);
}
function getChangeDetectionMode(view) {
var mode;
if (view.viewType === ViewType.COMPONENT) {
mode = isDefaultChangeDetectionStrategy(view.component.changeDetection) ?
ChangeDetectionStrategy.CheckAlways :
ChangeDetectionStrategy.CheckOnce;
}
else {
mode = ChangeDetectionStrategy.CheckAlways;
}
return mode;
}