95 lines
3.4 KiB
TypeScript
95 lines
3.4 KiB
TypeScript
/**
|
|
* @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 path from 'path';
|
|
import * as ts from 'typescript';
|
|
|
|
import {findTightestNode, getClassDeclFromDecoratorProp, getPropertyAssignmentFromValue} from './ts_utils';
|
|
|
|
/**
|
|
* Gets an Angular-specific definition in a TypeScript source file.
|
|
*/
|
|
export function getTsDefinitionAndBoundSpan(
|
|
sf: ts.SourceFile, position: number,
|
|
tsLsHost: Pick<ts.LanguageServiceHost, 'fileExists'>): ts.DefinitionInfoAndBoundSpan|undefined {
|
|
const node = findTightestNode(sf, position);
|
|
if (!node) return;
|
|
switch (node.kind) {
|
|
case ts.SyntaxKind.StringLiteral:
|
|
case ts.SyntaxKind.NoSubstitutionTemplateLiteral:
|
|
// Attempt to extract definition of a URL in a property assignment.
|
|
return getUrlFromProperty(node as ts.StringLiteralLike, tsLsHost);
|
|
default:
|
|
return undefined;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Attempts to get the definition of a file whose URL is specified in a property assignment in a
|
|
* directive decorator.
|
|
* Currently applies to `templateUrl` and `styleUrls` properties.
|
|
*/
|
|
function getUrlFromProperty(
|
|
urlNode: ts.StringLiteralLike,
|
|
tsLsHost: Pick<ts.LanguageServiceHost, 'fileExists'>): ts.DefinitionInfoAndBoundSpan|undefined {
|
|
// Get the property assignment node corresponding to the `templateUrl` or `styleUrls` assignment.
|
|
// These assignments are specified differently; `templateUrl` is a string, and `styleUrls` is
|
|
// an array of strings:
|
|
// {
|
|
// templateUrl: './template.ng.html',
|
|
// styleUrls: ['./style.css', './other-style.css']
|
|
// }
|
|
// `templateUrl`'s property assignment can be found from the string literal node;
|
|
// `styleUrls`'s property assignment can be found from the array (parent) node.
|
|
//
|
|
// First search for `templateUrl`.
|
|
let asgn = getPropertyAssignmentFromValue(urlNode, 'templateUrl');
|
|
if (!asgn) {
|
|
// `templateUrl` assignment not found; search for `styleUrls` array assignment.
|
|
asgn = getPropertyAssignmentFromValue(urlNode.parent, 'styleUrls');
|
|
if (!asgn) {
|
|
// Nothing found, bail.
|
|
return;
|
|
}
|
|
}
|
|
|
|
// If the property assignment is not a property of a class decorator, don't generate definitions
|
|
// for it.
|
|
if (!getClassDeclFromDecoratorProp(asgn)) {
|
|
return;
|
|
}
|
|
|
|
const sf = urlNode.getSourceFile();
|
|
// Extract url path specified by the url node, which is relative to the TypeScript source file
|
|
// the url node is defined in.
|
|
const url = path.join(path.dirname(sf.fileName), urlNode.text);
|
|
|
|
// If the file does not exist, bail. It is possible that the TypeScript language service host
|
|
// does not have a `fileExists` method, in which case optimistically assume the file exists.
|
|
if (tsLsHost.fileExists && !tsLsHost.fileExists(url)) return;
|
|
|
|
const templateDefinitions: ts.DefinitionInfo[] = [{
|
|
kind: ts.ScriptElementKind.externalModuleName,
|
|
name: url,
|
|
containerKind: ts.ScriptElementKind.unknown,
|
|
containerName: '',
|
|
// Reading the template is expensive, so don't provide a preview.
|
|
textSpan: {start: 0, length: 0},
|
|
fileName: url,
|
|
}];
|
|
|
|
return {
|
|
definitions: templateDefinitions,
|
|
textSpan: {
|
|
// Exclude opening and closing quotes in the url span.
|
|
start: urlNode.getStart() + 1,
|
|
length: urlNode.getWidth() - 2,
|
|
},
|
|
};
|
|
}
|