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/** * @fileoverview Rule to disallow Math.pow in favor of the ** operator * @author Milos Djermanovic */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const astUtils = require("./utils/ast-utils"); const { CALL, ReferenceTracker } = require("@eslint-community/eslint-utils"); //------------------------------------------------------------------------------ // Helpers //------------------------------------------------------------------------------ const PRECEDENCE_OF_EXPONENTIATION_EXPR = astUtils.getPrecedence({ type: "BinaryExpression", operator: "**" }); /** * Determines whether the given node needs parens if used as the base in an exponentiation binary expression. * @param {ASTNode} base The node to check. * @returns {boolean} `true` if the node needs to be parenthesised. */ function doesBaseNeedParens(base) { return ( // '**' is right-associative, parens are needed when Math.pow(a ** b, c) is converted to (a ** b) ** c astUtils.getPrecedence(base) <= PRECEDENCE_OF_EXPONENTIATION_EXPR || // An unary operator cannot be used immediately before an exponentiation expression base.type === "AwaitExpression" || base.type === "UnaryExpression" ); } /** * Determines whether the given node needs parens if used as the exponent in an exponentiation binary expression. * @param {ASTNode} exponent The node to check. * @returns {boolean} `true` if the node needs to be parenthesised. */ function doesExponentNeedParens(exponent) { // '**' is right-associative, there is no need for parens when Math.pow(a, b ** c) is converted to a ** b ** c return astUtils.getPrecedence(exponent) < PRECEDENCE_OF_EXPONENTIATION_EXPR; } /** * Determines whether an exponentiation binary expression at the place of the given node would need parens. * @param {ASTNode} node A node that would be replaced by an exponentiation binary expression. * @param {SourceCode} sourceCode A SourceCode object. * @returns {boolean} `true` if the expression needs to be parenthesised. */ function doesExponentiationExpressionNeedParens(node, sourceCode) { const parent = node.parent.type === "ChainExpression" ? node.parent.parent : node.parent; const parentPrecedence = astUtils.getPrecedence(parent); const needsParens = ( parent.type === "ClassDeclaration" || ( parent.type.endsWith("Expression") && (parentPrecedence === -1 || parentPrecedence >= PRECEDENCE_OF_EXPONENTIATION_EXPR) && !(parent.type === "BinaryExpression" && parent.operator === "**" && parent.right === node) && !((parent.type === "CallExpression" || parent.type === "NewExpression") && parent.arguments.includes(node)) && !(parent.type === "MemberExpression" && parent.computed && parent.property === node) && !(parent.type === "ArrayExpression") ) ); return needsParens && !astUtils.isParenthesised(sourceCode, node); } /** * Optionally parenthesizes given text. * @param {string} text The text to parenthesize. * @param {boolean} shouldParenthesize If `true`, the text will be parenthesised. * @returns {string} parenthesised or unchanged text. */ function parenthesizeIfShould(text, shouldParenthesize) { return shouldParenthesize ? `(${text})` : text; } //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "suggestion", docs: { description: "Disallow the use of `Math.pow` in favor of the `**` operator", recommended: false, url: "https://eslint.org/docs/latest/rules/prefer-exponentiation-operator" }, schema: [], fixable: "code", messages: { useExponentiation: "Use the '**' operator instead of 'Math.pow'." } }, create(context) { const sourceCode = context.sourceCode; /** * Reports the given node. * @param {ASTNode} node 'Math.pow()' node to report. * @returns {void} */ function report(node) { context.report({ node, messageId: "useExponentiation", fix(fixer) { if ( node.arguments.length !== 2 || node.arguments.some(arg => arg.type === "SpreadElement") || sourceCode.getCommentsInside(node).length > 0 ) { return null; } const base = node.arguments[0], exponent = node.arguments[1], baseText = sourceCode.getText(base), exponentText = sourceCode.getText(exponent), shouldParenthesizeBase = doesBaseNeedParens(base), shouldParenthesizeExponent = doesExponentNeedParens(exponent), shouldParenthesizeAll = doesExponentiationExpressionNeedParens(node, sourceCode); let prefix = "", suffix = ""; if (!shouldParenthesizeAll) { if (!shouldParenthesizeBase) { const firstReplacementToken = sourceCode.getFirstToken(base), tokenBefore = sourceCode.getTokenBefore(node); if ( tokenBefore && tokenBefore.range[1] === node.range[0] && !astUtils.canTokensBeAdjacent(tokenBefore, firstReplacementToken) ) { prefix = " "; // a+Math.pow(++b, c) -> a+ ++b**c } } if (!shouldParenthesizeExponent) { const lastReplacementToken = sourceCode.getLastToken(exponent), tokenAfter = sourceCode.getTokenAfter(node); if ( tokenAfter && node.range[1] === tokenAfter.range[0] && !astUtils.canTokensBeAdjacent(lastReplacementToken, tokenAfter) ) { suffix = " "; // Math.pow(a, b)in c -> a**b in c } } } const baseReplacement = parenthesizeIfShould(baseText, shouldParenthesizeBase), exponentReplacement = parenthesizeIfShould(exponentText, shouldParenthesizeExponent), replacement = parenthesizeIfShould(`${baseReplacement}**${exponentReplacement}`, shouldParenthesizeAll); return fixer.replaceText(node, `${prefix}${replacement}${suffix}`); } }); } return { Program(node) { const scope = sourceCode.getScope(node); const tracker = new ReferenceTracker(scope); const trackMap = { Math: { pow: { [CALL]: true } } }; for (const { node: refNode } of tracker.iterateGlobalReferences(trackMap)) { report(refNode); } } }; } };