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feat(language-service): add definitions for styleUrls (#32464)

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Adds support for `styleUrls` definitions in the same way `templateUrl`
definitions are provided; clicking on styleUrl will take a user to the
respective file.

Unifies some code in determining a URL definition. We first check if a
url is a `templateUrl`; if it's not, we check that it's a `styleUrl` or
return no definitions.

PR Close #32464
This commit is contained in:
ayazhafiz
2019-09-01 09:56:29 -05:00
committed by Matias Niemelä
parent c3a1ef219e
commit a391aebbcf
7 changed files with 144 additions and 40 deletions
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78
packages/language-service/src/definitions.ts
View File

@ -84,45 +84,61 @@ export function getTsDefinitionAndBoundSpan(
/**
* Attempts to get the definition of a file whose URL is specified in a property assignment in a
* directive decorator.
* Currently applies to `templateUrl` properties.
* Currently applies to `templateUrl` and `styleUrls` properties.
*/
function getUrlFromProperty(
urlNode: ts.StringLiteralLike,
tsLsHost: Readonly<ts.LanguageServiceHost>): ts.DefinitionInfoAndBoundSpan|undefined {
const asgn = getPropertyAssignmentFromValue(urlNode);
if (!asgn) return;
// If the URL is not a property of a class decorator, don't generate definitions for it.
// 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);
if (!asgn || asgn.name.getText() !== 'templateUrl') {
// `templateUrl` assignment not found; search for `styleUrls` array assignment.
asgn = getPropertyAssignmentFromValue(urlNode.parent);
if (!asgn || asgn.name.getText() !== 'styleUrls') {
// Nothing found, bail.
return;
}
}
// If the property assignment is not a property of a class decorator, don't generate definitions
// for it.
if (!isClassDecoratorProperty(asgn)) return;
const sf = urlNode.getSourceFile();
switch (asgn.name.getText()) {
case 'templateUrl':
// Extract definition of the template file specified by this `templateUrl` property.
const url = path.join(path.dirname(sf.fileName), urlNode.text);
// 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;
// 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,
}];
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,
},
};
default:
return undefined;
}
return {
definitions: templateDefinitions,
textSpan: {
// Exclude opening and closing quotes in the url span.
start: urlNode.getStart() + 1,
length: urlNode.getWidth() - 2,
},
};
}