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code-server/build/lib/eslint/vscode-dts-event-naming.ts

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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import * as eslint from 'eslint';
import { TSESTree, AST_NODE_TYPES } from '@typescript-eslint/experimental-utils';
export = new class ApiEventNaming implements eslint.Rule.RuleModule {
private static _nameRegExp = /on(Did|Will)([A-Z][a-z]+)([A-Z][a-z]+)?/;
readonly meta: eslint.Rule.RuleMetaData = {
docs: {
url: 'https://github.com/microsoft/vscode/wiki/Extension-API-guidelines#event-naming'
},
messages: {
naming: 'Event names must follow this patten: `on[Did|Will]<Verb><Subject>`',
verb: 'Unknown verb \'{{verb}}\' - is this really a verb? Iff so, then add this verb to the configuration',
subject: 'Unknown subject \'{{subject}}\' - This subject has not been used before but it should refer to something in the API',
unknown: 'UNKNOWN event declaration, lint-rule needs tweaking'
}
};
create(context: eslint.Rule.RuleContext): eslint.Rule.RuleListener {
const config = <{ allowed: string[], verbs: string[] }>context.options[0];
const allowed = new Set(config.allowed);
const verbs = new Set(config.verbs);
return {
['TSTypeAnnotation TSTypeReference Identifier[name="Event"]']: (node: any) => {
const def = (<TSESTree.Identifier>node).parent?.parent?.parent;
const ident = this.getIdent(def);
if (!ident) {
// event on unknown structure...
return context.report({
node,
message: 'unknown'
});
}
if (allowed.has(ident.name)) {
// configured exception
return;
}
const match = ApiEventNaming._nameRegExp.exec(ident.name);
if (!match) {
context.report({
node: ident,
messageId: 'naming'
});
return;
}
// check that <verb> is spelled out (configured) as verb
if (!verbs.has(match[2].toLowerCase())) {
context.report({
node: ident,
messageId: 'verb',
data: { verb: match[2] }
});
}
// check that a subject (if present) has occurred
if (match[3]) {
const regex = new RegExp(match[3], 'ig');
const parts = context.getSourceCode().getText().split(regex);
if (parts.length < 3) {
context.report({
node: ident,
messageId: 'subject',
data: { subject: match[3] }
});
}
}
}
};
}
private getIdent(def: TSESTree.Node | undefined): TSESTree.Identifier | undefined {
if (!def) {
return;
}
if (def.type === AST_NODE_TYPES.Identifier) {
return def;
} else if ((def.type === AST_NODE_TYPES.TSPropertySignature || def.type === AST_NODE_TYPES.ClassProperty) && def.key.type === AST_NODE_TYPES.Identifier) {
return def.key;
}
return this.getIdent(def.parent);
}
};