82 lines
2.5 KiB
TypeScript
82 lines
2.5 KiB
TypeScript
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import * as ts from 'typescript';
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/**
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* Return the node that most tightly encompasses the specified `position`.
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* @param node The starting node to start the top-down search.
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* @param position The target position within the `node`.
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*/
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export function findTightestNode(node: ts.Node, position: number): ts.Node|undefined {
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if (node.getStart() <= position && position < node.getEnd()) {
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return node.forEachChild(c => findTightestNode(c, position)) ?? node;
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}
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return undefined;
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}
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export function getParentClassDeclaration(startNode: ts.Node): ts.ClassDeclaration|undefined {
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while (startNode) {
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if (ts.isClassDeclaration(startNode)) {
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return startNode;
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}
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startNode = startNode.parent;
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}
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return undefined;
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}
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/**
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* Returns a property assignment from the assignment value if the property name
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* matches the specified `key`, or `null` if there is no match.
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*/
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export function getPropertyAssignmentFromValue(value: ts.Node, key: string): ts.PropertyAssignment|
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null {
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const propAssignment = value.parent;
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if (!propAssignment || !ts.isPropertyAssignment(propAssignment) ||
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propAssignment.name.getText() !== key) {
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return null;
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}
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return propAssignment;
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}
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/**
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* Given a decorator property assignment, return the ClassDeclaration node that corresponds to the
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* directive class the property applies to.
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* If the property assignment is not on a class decorator, no declaration is returned.
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*
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* For example,
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*
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* @Component({
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* template: '<div></div>'
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* ^^^^^^^^^^^^^^^^^^^^^^^---- property assignment
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* })
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* class AppComponent {}
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* ^---- class declaration node
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*
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* @param propAsgnNode property assignment
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*/
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export function getClassDeclFromDecoratorProp(propAsgnNode: ts.PropertyAssignment):
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ts.ClassDeclaration|undefined {
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if (!propAsgnNode.parent || !ts.isObjectLiteralExpression(propAsgnNode.parent)) {
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return;
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}
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const objLitExprNode = propAsgnNode.parent;
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if (!objLitExprNode.parent || !ts.isCallExpression(objLitExprNode.parent)) {
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return;
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}
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const callExprNode = objLitExprNode.parent;
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if (!callExprNode.parent || !ts.isDecorator(callExprNode.parent)) {
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return;
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}
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const decorator = callExprNode.parent;
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if (!decorator.parent || !ts.isClassDeclaration(decorator.parent)) {
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return;
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}
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const classDeclNode = decorator.parent;
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return classDeclNode;
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}
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