1 | /**
|
2 | * @fileoverview Rule to check the spacing around the * in yield* expressions.
|
3 | * @author Bryan Smith
|
4 | */
|
5 |
|
6 | ;
|
7 |
|
8 | //------------------------------------------------------------------------------
|
9 | // Rule Definition
|
10 | //------------------------------------------------------------------------------
|
11 |
|
12 | module.exports = {
|
13 | meta: {
|
14 | docs: {
|
15 | description: "require or disallow spacing around the `*` in `yield*` expressions",
|
16 | category: "ECMAScript 6",
|
17 | recommended: false
|
18 | },
|
19 |
|
20 | fixable: "whitespace",
|
21 |
|
22 | schema: [
|
23 | {
|
24 | oneOf: [
|
25 | {
|
26 | enum: ["before", "after", "both", "neither"]
|
27 | },
|
28 | {
|
29 | type: "object",
|
30 | properties: {
|
31 | before: { type: "boolean" },
|
32 | after: { type: "boolean" }
|
33 | },
|
34 | additionalProperties: false
|
35 | }
|
36 | ]
|
37 | }
|
38 | ]
|
39 | },
|
40 |
|
41 | create(context) {
|
42 | const sourceCode = context.getSourceCode();
|
43 |
|
44 | const mode = (function(option) {
|
45 | if (!option || typeof option === "string") {
|
46 | return {
|
47 | before: { before: true, after: false },
|
48 | after: { before: false, after: true },
|
49 | both: { before: true, after: true },
|
50 | neither: { before: false, after: false }
|
51 | }[option || "after"];
|
52 | }
|
53 | return option;
|
54 | }(context.options[0]));
|
55 |
|
56 | /**
|
57 | * Checks the spacing between two tokens before or after the star token.
|
58 | * @param {string} side Either "before" or "after".
|
59 | * @param {Token} leftToken `function` keyword token if side is "before", or
|
60 | * star token if side is "after".
|
61 | * @param {Token} rightToken Star token if side is "before", or identifier
|
62 | * token if side is "after".
|
63 | * @returns {void}
|
64 | */
|
65 | function checkSpacing(side, leftToken, rightToken) {
|
66 | if (sourceCode.isSpaceBetweenTokens(leftToken, rightToken) !== mode[side]) {
|
67 | const after = leftToken.value === "*";
|
68 | const spaceRequired = mode[side];
|
69 | const node = after ? leftToken : rightToken;
|
70 | const type = spaceRequired ? "Missing" : "Unexpected";
|
71 | const message = "{{type}} space {{side}} *.";
|
72 |
|
73 | context.report({
|
74 | node,
|
75 | message,
|
76 | data: {
|
77 | type,
|
78 | side
|
79 | },
|
80 | fix(fixer) {
|
81 | if (spaceRequired) {
|
82 | if (after) {
|
83 | return fixer.insertTextAfter(node, " ");
|
84 | }
|
85 | return fixer.insertTextBefore(node, " ");
|
86 | }
|
87 | return fixer.removeRange([leftToken.range[1], rightToken.range[0]]);
|
88 | }
|
89 | });
|
90 | }
|
91 | }
|
92 |
|
93 | /**
|
94 | * Enforces the spacing around the star if node is a yield* expression.
|
95 | * @param {ASTNode} node A yield expression node.
|
96 | * @returns {void}
|
97 | */
|
98 | function checkExpression(node) {
|
99 | if (!node.delegate) {
|
100 | return;
|
101 | }
|
102 |
|
103 | const tokens = sourceCode.getFirstTokens(node, 3);
|
104 | const yieldToken = tokens[0];
|
105 | const starToken = tokens[1];
|
106 | const nextToken = tokens[2];
|
107 |
|
108 | checkSpacing("before", yieldToken, starToken);
|
109 | checkSpacing("after", starToken, nextToken);
|
110 | }
|
111 |
|
112 | return {
|
113 | YieldExpression: checkExpression
|
114 | };
|
115 |
|
116 | }
|
117 | };
|