146 lines
5.2 KiB
JavaScript
146 lines
5.2 KiB
JavaScript
/**
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* @fileoverview Rule that warns when identifier names are shorter or longer
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* than the values provided in configuration.
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* @author Burak Yigit Kaya aka BYK
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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: "suggestion",
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docs: {
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description: "enforce minimum and maximum identifier lengths",
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category: "Stylistic Issues",
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recommended: false,
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url: "https://eslint.org/docs/rules/id-length"
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},
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schema: [
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{
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type: "object",
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properties: {
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min: {
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type: "integer",
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default: 2
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},
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max: {
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type: "integer"
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},
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exceptions: {
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type: "array",
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uniqueItems: true,
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items: {
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type: "string"
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}
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},
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exceptionPatterns: {
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type: "array",
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uniqueItems: true,
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items: {
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type: "string"
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}
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},
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properties: {
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enum: ["always", "never"]
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}
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},
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additionalProperties: false
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}
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],
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messages: {
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tooShort: "Identifier name '{{name}}' is too short (< {{min}}).",
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tooLong: "Identifier name '{{name}}' is too long (> {{max}})."
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}
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},
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create(context) {
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const options = context.options[0] || {};
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const minLength = typeof options.min !== "undefined" ? options.min : 2;
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const maxLength = typeof options.max !== "undefined" ? options.max : Infinity;
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const properties = options.properties !== "never";
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const exceptions = new Set(options.exceptions);
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const exceptionPatterns = (options.exceptionPatterns || []).map(pattern => new RegExp(pattern, "u"));
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const reportedNode = new Set();
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/**
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* Checks if a string matches the provided exception patterns
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* @param {string} name The string to check.
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* @returns {boolean} if the string is a match
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* @private
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*/
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function matchesExceptionPattern(name) {
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return exceptionPatterns.some(pattern => pattern.test(name));
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}
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const SUPPORTED_EXPRESSIONS = {
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MemberExpression: properties && function(parent) {
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return !parent.computed && (
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// regular property assignment
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(parent.parent.left === parent && parent.parent.type === "AssignmentExpression" ||
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// or the last identifier in an ObjectPattern destructuring
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parent.parent.type === "Property" && parent.parent.value === parent &&
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parent.parent.parent.type === "ObjectPattern" && parent.parent.parent.parent.left === parent.parent.parent)
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);
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},
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AssignmentPattern(parent, node) {
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return parent.left === node;
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},
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VariableDeclarator(parent, node) {
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return parent.id === node;
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},
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Property(parent, node) {
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if (parent.parent.type === "ObjectPattern") {
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return (
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parent.value !== parent.key && parent.value === node ||
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parent.value === parent.key && parent.key === node && properties
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);
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}
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return properties && !parent.computed && parent.key === node;
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},
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ImportDefaultSpecifier: true,
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RestElement: true,
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FunctionExpression: true,
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ArrowFunctionExpression: true,
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ClassDeclaration: true,
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FunctionDeclaration: true,
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MethodDefinition: true,
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CatchClause: true,
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ArrayPattern: true
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};
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return {
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Identifier(node) {
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const name = node.name;
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const parent = node.parent;
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const isShort = name.length < minLength;
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const isLong = name.length > maxLength;
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if (!(isShort || isLong) || exceptions.has(name) || matchesExceptionPattern(name)) {
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return; // Nothing to report
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}
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const isValidExpression = SUPPORTED_EXPRESSIONS[parent.type];
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if (isValidExpression && !reportedNode.has(node) && (isValidExpression === true || isValidExpression(parent, node))) {
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reportedNode.add(node);
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context.report({
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node,
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messageId: isShort ? "tooShort" : "tooLong",
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data: { name, min: minLength, max: maxLength }
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});
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}
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}
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};
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}
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};
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