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207 lines
6.9 KiB
JavaScript
207 lines
6.9 KiB
JavaScript
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/**
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* @fileoverview Rule to check the spacing around the * in generator functions.
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* @author Jamund Ferguson
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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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const OVERRIDE_SCHEMA = {
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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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module.exports = {
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meta: {
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type: "layout",
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docs: {
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description: "enforce consistent spacing around `*` operators in generator functions",
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category: "ECMAScript 6",
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recommended: false,
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url: "https://eslint.org/docs/rules/generator-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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named: OVERRIDE_SCHEMA,
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anonymous: OVERRIDE_SCHEMA,
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method: OVERRIDE_SCHEMA
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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 optionDefinitions = {
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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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};
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/**
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* Returns resolved option definitions based on an option and defaults
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* @param {any} option The option object or string value
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* @param {Object} defaults The defaults to use if options are not present
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* @returns {Object} the resolved object definition
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*/
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function optionToDefinition(option, defaults) {
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if (!option) {
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return defaults;
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}
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return typeof option === "string"
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? optionDefinitions[option]
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: Object.assign({}, defaults, option);
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}
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const modes = (function(option) {
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const defaults = optionToDefinition(option, optionDefinitions.before);
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return {
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named: optionToDefinition(option.named, defaults),
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anonymous: optionToDefinition(option.anonymous, defaults),
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method: optionToDefinition(option.method, defaults)
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};
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}(context.options[0] || {}));
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const sourceCode = context.getSourceCode();
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/**
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* Checks if the given token is a star token or not.
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* @param {Token} token The token to check.
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* @returns {boolean} `true` if the token is a star token.
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*/
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function isStarToken(token) {
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return token.value === "*" && token.type === "Punctuator";
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}
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/**
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* Gets the generator star token of the given function node.
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* @param {ASTNode} node The function node to get.
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* @returns {Token} Found star token.
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*/
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function getStarToken(node) {
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return sourceCode.getFirstToken(
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(node.parent.method || node.parent.type === "MethodDefinition") ? node.parent : node,
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isStarToken
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);
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}
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/**
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* capitalize a given string.
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* @param {string} str the given string.
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* @returns {string} the capitalized string.
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*/
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function capitalize(str) {
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return str[0].toUpperCase() + str.slice(1);
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}
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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} kind Either "named", "anonymous", or "method"
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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(kind, side, leftToken, rightToken) {
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if (!!(rightToken.range[0] - leftToken.range[1]) !== modes[kind][side]) {
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const after = leftToken.value === "*";
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const spaceRequired = modes[kind][side];
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const node = after ? leftToken : rightToken;
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const messageId = `${spaceRequired ? "missing" : "unexpected"}${capitalize(side)}`;
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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 generator function.
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* @param {ASTNode} node A function expression or declaration node.
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* @returns {void}
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*/
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function checkFunction(node) {
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if (!node.generator) {
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return;
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}
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const starToken = getStarToken(node);
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const prevToken = sourceCode.getTokenBefore(starToken);
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const nextToken = sourceCode.getTokenAfter(starToken);
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let kind = "named";
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if (node.parent.type === "MethodDefinition" || (node.parent.type === "Property" && node.parent.method)) {
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kind = "method";
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} else if (!node.id) {
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kind = "anonymous";
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}
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// Only check before when preceded by `function`|`static` keyword
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if (!(kind === "method" && starToken === sourceCode.getFirstToken(node.parent))) {
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checkSpacing(kind, "before", prevToken, starToken);
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}
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checkSpacing(kind, "after", starToken, nextToken);
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}
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return {
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FunctionDeclaration: checkFunction,
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FunctionExpression: checkFunction
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};
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}
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};
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