angular-cn/packages/language-service/ivy/ts_utils.ts

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/**
* @license
* Copyright Google LLC 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 * as ts from 'typescript';
/**
* Return the node that most tightly encompasses the specified `position`.
* @param node The starting node to start the top-down search.
* @param position The target position within the `node`.
*/
export function findTightestNode(node: ts.Node, position: number): ts.Node|undefined {
if (node.getStart() <= position && position < node.getEnd()) {
return node.forEachChild(c => findTightestNode(c, position)) ?? node;
}
return undefined;
}
export function getParentClassDeclaration(startNode: ts.Node): ts.ClassDeclaration|undefined {
while (startNode) {
if (ts.isClassDeclaration(startNode)) {
return startNode;
}
startNode = startNode.parent;
}
return undefined;
}