source: imaps-frontend/node_modules/eslint/lib/rules/comma-dangle.js

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Update repo after prototype presentation
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1/**
2 * @fileoverview Rule to forbid or enforce dangling commas.
3 * @author Ian Christian Myers
4 * @deprecated in ESLint v8.53.0
5 */
6
7"use strict";
8
9//------------------------------------------------------------------------------
10// Requirements
11//------------------------------------------------------------------------------
12
13const astUtils = require("./utils/ast-utils");
14
15//------------------------------------------------------------------------------
16// Helpers
17//------------------------------------------------------------------------------
18
19const DEFAULT_OPTIONS = Object.freeze({
20 arrays: "never",
21 objects: "never",
22 imports: "never",
23 exports: "never",
24 functions: "never"
25});
26
27/**
28 * Checks whether or not a trailing comma is allowed in a given node.
29 * If the `lastItem` is `RestElement` or `RestProperty`, it disallows trailing commas.
30 * @param {ASTNode} lastItem The node of the last element in the given node.
31 * @returns {boolean} `true` if a trailing comma is allowed.
32 */
33function isTrailingCommaAllowed(lastItem) {
34 return !(
35 lastItem.type === "RestElement" ||
36 lastItem.type === "RestProperty" ||
37 lastItem.type === "ExperimentalRestProperty"
38 );
39}
40
41/**
42 * Normalize option value.
43 * @param {string|Object|undefined} optionValue The 1st option value to normalize.
44 * @param {number} ecmaVersion The normalized ECMAScript version.
45 * @returns {Object} The normalized option value.
46 */
47function normalizeOptions(optionValue, ecmaVersion) {
48 if (typeof optionValue === "string") {
49 return {
50 arrays: optionValue,
51 objects: optionValue,
52 imports: optionValue,
53 exports: optionValue,
54 functions: ecmaVersion < 2017 ? "ignore" : optionValue
55 };
56 }
57 if (typeof optionValue === "object" && optionValue !== null) {
58 return {
59 arrays: optionValue.arrays || DEFAULT_OPTIONS.arrays,
60 objects: optionValue.objects || DEFAULT_OPTIONS.objects,
61 imports: optionValue.imports || DEFAULT_OPTIONS.imports,
62 exports: optionValue.exports || DEFAULT_OPTIONS.exports,
63 functions: optionValue.functions || DEFAULT_OPTIONS.functions
64 };
65 }
66
67 return DEFAULT_OPTIONS;
68}
69
70//------------------------------------------------------------------------------
71// Rule Definition
72//------------------------------------------------------------------------------
73
74/** @type {import('../shared/types').Rule} */
75module.exports = {
76 meta: {
77 deprecated: true,
78 replacedBy: [],
79 type: "layout",
80
81 docs: {
82 description: "Require or disallow trailing commas",
83 recommended: false,
84 url: "https://eslint.org/docs/latest/rules/comma-dangle"
85 },
86
87 fixable: "code",
88
89 schema: {
90 definitions: {
91 value: {
92 enum: [
93 "always-multiline",
94 "always",
95 "never",
96 "only-multiline"
97 ]
98 },
99 valueWithIgnore: {
100 enum: [
101 "always-multiline",
102 "always",
103 "ignore",
104 "never",
105 "only-multiline"
106 ]
107 }
108 },
109 type: "array",
110 items: [
111 {
112 oneOf: [
113 {
114 $ref: "#/definitions/value"
115 },
116 {
117 type: "object",
118 properties: {
119 arrays: { $ref: "#/definitions/valueWithIgnore" },
120 objects: { $ref: "#/definitions/valueWithIgnore" },
121 imports: { $ref: "#/definitions/valueWithIgnore" },
122 exports: { $ref: "#/definitions/valueWithIgnore" },
123 functions: { $ref: "#/definitions/valueWithIgnore" }
124 },
125 additionalProperties: false
126 }
127 ]
128 }
129 ],
130 additionalItems: false
131 },
132
133 messages: {
134 unexpected: "Unexpected trailing comma.",
135 missing: "Missing trailing comma."
136 }
137 },
138
139 create(context) {
140 const options = normalizeOptions(context.options[0], context.languageOptions.ecmaVersion);
141
142 const sourceCode = context.sourceCode;
143
144 /**
145 * Gets the last item of the given node.
146 * @param {ASTNode} node The node to get.
147 * @returns {ASTNode|null} The last node or null.
148 */
149 function getLastItem(node) {
150
151 /**
152 * Returns the last element of an array
153 * @param {any[]} array The input array
154 * @returns {any} The last element
155 */
156 function last(array) {
157 return array[array.length - 1];
158 }
159
160 switch (node.type) {
161 case "ObjectExpression":
162 case "ObjectPattern":
163 return last(node.properties);
164 case "ArrayExpression":
165 case "ArrayPattern":
166 return last(node.elements);
167 case "ImportDeclaration":
168 case "ExportNamedDeclaration":
169 return last(node.specifiers);
170 case "FunctionDeclaration":
171 case "FunctionExpression":
172 case "ArrowFunctionExpression":
173 return last(node.params);
174 case "CallExpression":
175 case "NewExpression":
176 return last(node.arguments);
177 default:
178 return null;
179 }
180 }
181
182 /**
183 * Gets the trailing comma token of the given node.
184 * If the trailing comma does not exist, this returns the token which is
185 * the insertion point of the trailing comma token.
186 * @param {ASTNode} node The node to get.
187 * @param {ASTNode} lastItem The last item of the node.
188 * @returns {Token} The trailing comma token or the insertion point.
189 */
190 function getTrailingToken(node, lastItem) {
191 switch (node.type) {
192 case "ObjectExpression":
193 case "ArrayExpression":
194 case "CallExpression":
195 case "NewExpression":
196 return sourceCode.getLastToken(node, 1);
197 default: {
198 const nextToken = sourceCode.getTokenAfter(lastItem);
199
200 if (astUtils.isCommaToken(nextToken)) {
201 return nextToken;
202 }
203 return sourceCode.getLastToken(lastItem);
204 }
205 }
206 }
207
208 /**
209 * Checks whether or not a given node is multiline.
210 * This rule handles a given node as multiline when the closing parenthesis
211 * and the last element are not on the same line.
212 * @param {ASTNode} node A node to check.
213 * @returns {boolean} `true` if the node is multiline.
214 */
215 function isMultiline(node) {
216 const lastItem = getLastItem(node);
217
218 if (!lastItem) {
219 return false;
220 }
221
222 const penultimateToken = getTrailingToken(node, lastItem);
223 const lastToken = sourceCode.getTokenAfter(penultimateToken);
224
225 return lastToken.loc.end.line !== penultimateToken.loc.end.line;
226 }
227
228 /**
229 * Reports a trailing comma if it exists.
230 * @param {ASTNode} node A node to check. Its type is one of
231 * ObjectExpression, ObjectPattern, ArrayExpression, ArrayPattern,
232 * ImportDeclaration, and ExportNamedDeclaration.
233 * @returns {void}
234 */
235 function forbidTrailingComma(node) {
236 const lastItem = getLastItem(node);
237
238 if (!lastItem || (node.type === "ImportDeclaration" && lastItem.type !== "ImportSpecifier")) {
239 return;
240 }
241
242 const trailingToken = getTrailingToken(node, lastItem);
243
244 if (astUtils.isCommaToken(trailingToken)) {
245 context.report({
246 node: lastItem,
247 loc: trailingToken.loc,
248 messageId: "unexpected",
249 *fix(fixer) {
250 yield fixer.remove(trailingToken);
251
252 /*
253 * Extend the range of the fix to include surrounding tokens to ensure
254 * that the element after which the comma is removed stays _last_.
255 * This intentionally makes conflicts in fix ranges with rules that may be
256 * adding or removing elements in the same autofix pass.
257 * https://github.com/eslint/eslint/issues/15660
258 */
259 yield fixer.insertTextBefore(sourceCode.getTokenBefore(trailingToken), "");
260 yield fixer.insertTextAfter(sourceCode.getTokenAfter(trailingToken), "");
261 }
262 });
263 }
264 }
265
266 /**
267 * Reports the last element of a given node if it does not have a trailing
268 * comma.
269 *
270 * If a given node is `ArrayPattern` which has `RestElement`, the trailing
271 * comma is disallowed, so report if it exists.
272 * @param {ASTNode} node A node to check. Its type is one of
273 * ObjectExpression, ObjectPattern, ArrayExpression, ArrayPattern,
274 * ImportDeclaration, and ExportNamedDeclaration.
275 * @returns {void}
276 */
277 function forceTrailingComma(node) {
278 const lastItem = getLastItem(node);
279
280 if (!lastItem || (node.type === "ImportDeclaration" && lastItem.type !== "ImportSpecifier")) {
281 return;
282 }
283 if (!isTrailingCommaAllowed(lastItem)) {
284 forbidTrailingComma(node);
285 return;
286 }
287
288 const trailingToken = getTrailingToken(node, lastItem);
289
290 if (trailingToken.value !== ",") {
291 context.report({
292 node: lastItem,
293 loc: {
294 start: trailingToken.loc.end,
295 end: astUtils.getNextLocation(sourceCode, trailingToken.loc.end)
296 },
297 messageId: "missing",
298 *fix(fixer) {
299 yield fixer.insertTextAfter(trailingToken, ",");
300
301 /*
302 * Extend the range of the fix to include surrounding tokens to ensure
303 * that the element after which the comma is inserted stays _last_.
304 * This intentionally makes conflicts in fix ranges with rules that may be
305 * adding or removing elements in the same autofix pass.
306 * https://github.com/eslint/eslint/issues/15660
307 */
308 yield fixer.insertTextBefore(trailingToken, "");
309 yield fixer.insertTextAfter(sourceCode.getTokenAfter(trailingToken), "");
310 }
311 });
312 }
313 }
314
315 /**
316 * If a given node is multiline, reports the last element of a given node
317 * when it does not have a trailing comma.
318 * Otherwise, reports a trailing comma if it exists.
319 * @param {ASTNode} node A node to check. Its type is one of
320 * ObjectExpression, ObjectPattern, ArrayExpression, ArrayPattern,
321 * ImportDeclaration, and ExportNamedDeclaration.
322 * @returns {void}
323 */
324 function forceTrailingCommaIfMultiline(node) {
325 if (isMultiline(node)) {
326 forceTrailingComma(node);
327 } else {
328 forbidTrailingComma(node);
329 }
330 }
331
332 /**
333 * Only if a given node is not multiline, reports the last element of a given node
334 * when it does not have a trailing comma.
335 * Otherwise, reports a trailing comma if it exists.
336 * @param {ASTNode} node A node to check. Its type is one of
337 * ObjectExpression, ObjectPattern, ArrayExpression, ArrayPattern,
338 * ImportDeclaration, and ExportNamedDeclaration.
339 * @returns {void}
340 */
341 function allowTrailingCommaIfMultiline(node) {
342 if (!isMultiline(node)) {
343 forbidTrailingComma(node);
344 }
345 }
346
347 const predicate = {
348 always: forceTrailingComma,
349 "always-multiline": forceTrailingCommaIfMultiline,
350 "only-multiline": allowTrailingCommaIfMultiline,
351 never: forbidTrailingComma,
352 ignore() {}
353 };
354
355 return {
356 ObjectExpression: predicate[options.objects],
357 ObjectPattern: predicate[options.objects],
358
359 ArrayExpression: predicate[options.arrays],
360 ArrayPattern: predicate[options.arrays],
361
362 ImportDeclaration: predicate[options.imports],
363
364 ExportNamedDeclaration: predicate[options.exports],
365
366 FunctionDeclaration: predicate[options.functions],
367 FunctionExpression: predicate[options.functions],
368 ArrowFunctionExpression: predicate[options.functions],
369 CallExpression: predicate[options.functions],
370 NewExpression: predicate[options.functions]
371 };
372 }
373};
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