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| /** | |
| * @fileoverview Rule to check the spacing around the * in yield* expressions. | |
| * @author Bryan Smith | |
| */ | |
| "use strict"; | |
| //------------------------------------------------------------------------------ | |
| // Rule Definition | |
| //------------------------------------------------------------------------------ | |
| module.exports = { | |
| meta: { | |
| type: "layout", | |
| docs: { | |
| description: "require or disallow spacing around the `*` in `yield*` expressions", | |
| category: "ECMAScript 6", | |
| recommended: false, | |
| url: "https://eslint.org/docs/rules/yield-star-spacing" | |
| }, | |
| fixable: "whitespace", | |
| schema: [ | |
| { | |
| oneOf: [ | |
| { | |
| enum: ["before", "after", "both", "neither"] | |
| }, | |
| { | |
| type: "object", | |
| properties: { | |
| before: { type: "boolean" }, | |
| after: { type: "boolean" } | |
| }, | |
| additionalProperties: false | |
| } | |
| ] | |
| } | |
| ], | |
| messages: { | |
| missingBefore: "Missing space before *.", | |
| missingAfter: "Missing space after *.", | |
| unexpectedBefore: "Unexpected space before *.", | |
| unexpectedAfter: "Unexpected space after *." | |
| } | |
| }, | |
| create(context) { | |
| const sourceCode = context.getSourceCode(); | |
| const mode = (function(option) { | |
| if (!option || typeof option === "string") { | |
| return { | |
| before: { before: true, after: false }, | |
| after: { before: false, after: true }, | |
| both: { before: true, after: true }, | |
| neither: { before: false, after: false } | |
| }[option || "after"]; | |
| } | |
| return option; | |
| }(context.options[0])); | |
| /** | |
| * Checks the spacing between two tokens before or after the star token. | |
| * @param {string} side Either "before" or "after". | |
| * @param {Token} leftToken `function` keyword token if side is "before", or | |
| * star token if side is "after". | |
| * @param {Token} rightToken Star token if side is "before", or identifier | |
| * token if side is "after". | |
| * @returns {void} | |
| */ | |
| function checkSpacing(side, leftToken, rightToken) { | |
| if (sourceCode.isSpaceBetweenTokens(leftToken, rightToken) !== mode[side]) { | |
| const after = leftToken.value === "*"; | |
| const spaceRequired = mode[side]; | |
| const node = after ? leftToken : rightToken; | |
| let messageId = ""; | |
| if (spaceRequired) { | |
| messageId = side === "before" ? "missingBefore" : "missingAfter"; | |
| } else { | |
| messageId = side === "before" ? "unexpectedBefore" : "unexpectedAfter"; | |
| } | |
| context.report({ | |
| node, | |
| messageId, | |
| fix(fixer) { | |
| if (spaceRequired) { | |
| if (after) { | |
| return fixer.insertTextAfter(node, " "); | |
| } | |
| return fixer.insertTextBefore(node, " "); | |
| } | |
| return fixer.removeRange([leftToken.range[1], rightToken.range[0]]); | |
| } | |
| }); | |
| } | |
| } | |
| /** | |
| * Enforces the spacing around the star if node is a yield* expression. | |
| * @param {ASTNode} node A yield expression node. | |
| * @returns {void} | |
| */ | |
| function checkExpression(node) { | |
| if (!node.delegate) { | |
| return; | |
| } | |
| const tokens = sourceCode.getFirstTokens(node, 3); | |
| const yieldToken = tokens[0]; | |
| const starToken = tokens[1]; | |
| const nextToken = tokens[2]; | |
| checkSpacing("before", yieldToken, starToken); | |
| checkSpacing("after", starToken, nextToken); | |
| } | |
| return { | |
| YieldExpression: checkExpression | |
| }; | |
| } | |
| }; |