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