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angular-docs-cn/packages/core/schematics/utils/parse_html.ts

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refactor(core): static-query schematic should check templates (#29713) Queries can technically be also accessed within component templates e.g. ```html <my-comp [binding]="myQuery"></my-comp> ``` In that case the query with the property "myQuery" is accessed statically and needs to be marked with `static: true`. There are other edge cases that need to be handled as the template property read doesn't necessarily resolve to the actual query property. For example: ```html <foo #myQuery></foo> <my-comp [binding]="myQuery"></my-comp> ``` In this scenario the binding doesn't refer to the actual query because the template reference variable takes precedence. The query doesn't need to be marked with "static: true" this time. This commit ensures that the `static-query` migration schematic now handles this cases properly. Also template property reads that access queries from within a `<ng-template>` are ignored as these can't access the query before the view has been initialized. Resolves FW-1216 PR Close #29713
2019-04-08 10:16:56 -04:00
/**
* @license
build: update license headers to reference Google LLC (#37205) Update the license headers throughout the repository to reference Google LLC rather than Google Inc, for the required license headers. PR Close #37205
2020-05-19 15:08:49 -04:00
* Copyright Google LLC All Rights Reserved.
refactor(core): static-query schematic should check templates (#29713) Queries can technically be also accessed within component templates e.g. ```html <my-comp [binding]="myQuery"></my-comp> ``` In that case the query with the property "myQuery" is accessed statically and needs to be marked with `static: true`. There are other edge cases that need to be handled as the template property read doesn't necessarily resolve to the actual query property. For example: ```html <foo #myQuery></foo> <my-comp [binding]="myQuery"></my-comp> ``` In this scenario the binding doesn't refer to the actual query because the template reference variable takes precedence. The query doesn't need to be marked with "static: true" this time. This commit ensures that the `static-query` migration schematic now handles this cases properly. Also template property reads that access queries from within a `<ng-template>` are ignored as these can't access the query before the view has been initialized. Resolves FW-1216 PR Close #29713
2019-04-08 10:16:56 -04:00
*
* 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 {parseTemplate} from '@angular/compiler';
import {Node} from '@angular/compiler/src/render3/r3_ast';
/**
* Parses the given HTML content using the Angular compiler. In case the parsing
* fails, null is being returned.
*/
export function parseHtmlGracefully(htmlContent: string, filePath: string): Node[]|null {
try {
return parseTemplate(htmlContent, filePath).nodes;
} catch {
// Do nothing if the template couldn't be parsed. We don't want to throw any
// exception if a template is syntactically not valid. e.g. template could be
// using preprocessor syntax.
return null;
}
}