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184 lines
5.5 KiB
JavaScript
184 lines
5.5 KiB
JavaScript
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/**
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* @fileoverview Rule to disallow assignments where both sides are exactly the same
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* @author Toru Nagashima
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const astUtils = require("./utils/ast-utils");
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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const SPACES = /\s+/gu;
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/**
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* Traverses 2 Pattern nodes in parallel, then reports self-assignments.
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* @param {ASTNode|null} left A left node to traverse. This is a Pattern or
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* a Property.
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* @param {ASTNode|null} right A right node to traverse. This is a Pattern or
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* a Property.
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* @param {boolean} props The flag to check member expressions as well.
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* @param {Function} report A callback function to report.
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* @returns {void}
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*/
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function eachSelfAssignment(left, right, props, report) {
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if (!left || !right) {
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// do nothing
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} else if (
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left.type === "Identifier" &&
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right.type === "Identifier" &&
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left.name === right.name
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) {
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report(right);
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} else if (
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left.type === "ArrayPattern" &&
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right.type === "ArrayExpression"
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) {
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const end = Math.min(left.elements.length, right.elements.length);
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for (let i = 0; i < end; ++i) {
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const leftElement = left.elements[i];
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const rightElement = right.elements[i];
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// Avoid cases such as [...a] = [...a, 1]
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if (
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leftElement &&
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leftElement.type === "RestElement" &&
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i < right.elements.length - 1
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) {
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break;
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}
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eachSelfAssignment(leftElement, rightElement, props, report);
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// After a spread element, those indices are unknown.
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if (rightElement && rightElement.type === "SpreadElement") {
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break;
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}
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}
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} else if (
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left.type === "RestElement" &&
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right.type === "SpreadElement"
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) {
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eachSelfAssignment(left.argument, right.argument, props, report);
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} else if (
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left.type === "ObjectPattern" &&
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right.type === "ObjectExpression" &&
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right.properties.length >= 1
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) {
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/*
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* Gets the index of the last spread property.
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* It's possible to overwrite properties followed by it.
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*/
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let startJ = 0;
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for (let i = right.properties.length - 1; i >= 0; --i) {
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const propType = right.properties[i].type;
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if (propType === "SpreadElement" || propType === "ExperimentalSpreadProperty") {
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startJ = i + 1;
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break;
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}
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}
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for (let i = 0; i < left.properties.length; ++i) {
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for (let j = startJ; j < right.properties.length; ++j) {
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eachSelfAssignment(
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left.properties[i],
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right.properties[j],
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props,
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report
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);
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}
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}
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} else if (
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left.type === "Property" &&
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right.type === "Property" &&
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right.kind === "init" &&
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!right.method
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) {
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const leftName = astUtils.getStaticPropertyName(left);
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if (leftName !== null && leftName === astUtils.getStaticPropertyName(right)) {
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eachSelfAssignment(left.value, right.value, props, report);
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}
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} else if (
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props &&
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astUtils.skipChainExpression(left).type === "MemberExpression" &&
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astUtils.skipChainExpression(right).type === "MemberExpression" &&
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astUtils.isSameReference(left, right)
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) {
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report(right);
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}
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}
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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: "problem",
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docs: {
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description: "disallow assignments where both sides are exactly the same",
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category: "Best Practices",
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recommended: true,
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url: "https://eslint.org/docs/rules/no-self-assign"
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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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props: {
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type: "boolean",
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default: true
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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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selfAssignment: "'{{name}}' is assigned to itself."
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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 [{ props = true } = {}] = context.options;
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/**
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* Reports a given node as self assignments.
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* @param {ASTNode} node A node to report. This is an Identifier node.
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* @returns {void}
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*/
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function report(node) {
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context.report({
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node,
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messageId: "selfAssignment",
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data: {
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name: sourceCode.getText(node).replace(SPACES, "")
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}
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});
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}
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return {
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AssignmentExpression(node) {
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if (node.operator === "=") {
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eachSelfAssignment(node.left, node.right, props, report);
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}
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}
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};
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}
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};
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