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Code Editor : no-loss-of-precision.js
/** * @fileoverview Rule to flag numbers that will lose significant figure precision at runtime * @author Jacob Moore */ "use strict"; //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "problem", docs: { description: "Disallow literal numbers that lose precision", recommended: true, url: "https://eslint.org/docs/latest/rules/no-loss-of-precision" }, schema: [], messages: { noLossOfPrecision: "This number literal will lose precision at runtime." } }, create(context) { /** * Returns whether the node is number literal * @param {Node} node the node literal being evaluated * @returns {boolean} true if the node is a number literal */ function isNumber(node) { return typeof node.value === "number"; } /** * Gets the source code of the given number literal. Removes `_` numeric separators from the result. * @param {Node} node the number `Literal` node * @returns {string} raw source code of the literal, without numeric separators */ function getRaw(node) { return node.raw.replace(/_/gu, ""); } /** * Checks whether the number is base ten * @param {ASTNode} node the node being evaluated * @returns {boolean} true if the node is in base ten */ function isBaseTen(node) { const prefixes = ["0x", "0X", "0b", "0B", "0o", "0O"]; return prefixes.every(prefix => !node.raw.startsWith(prefix)) && !/^0[0-7]+$/u.test(node.raw); } /** * Checks that the user-intended non-base ten number equals the actual number after is has been converted to the Number type * @param {Node} node the node being evaluated * @returns {boolean} true if they do not match */ function notBaseTenLosesPrecision(node) { const rawString = getRaw(node).toUpperCase(); let base = 0; if (rawString.startsWith("0B")) { base = 2; } else if (rawString.startsWith("0X")) { base = 16; } else { base = 8; } return !rawString.endsWith(node.value.toString(base).toUpperCase()); } /** * Adds a decimal point to the numeric string at index 1 * @param {string} stringNumber the numeric string without any decimal point * @returns {string} the numeric string with a decimal point in the proper place */ function addDecimalPointToNumber(stringNumber) { return `${stringNumber[0]}.${stringNumber.slice(1)}`; } /** * Returns the number stripped of leading zeros * @param {string} numberAsString the string representation of the number * @returns {string} the stripped string */ function removeLeadingZeros(numberAsString) { for (let i = 0; i < numberAsString.length; i++) { if (numberAsString[i] !== "0") { return numberAsString.slice(i); } } return numberAsString; } /** * Returns the number stripped of trailing zeros * @param {string} numberAsString the string representation of the number * @returns {string} the stripped string */ function removeTrailingZeros(numberAsString) { for (let i = numberAsString.length - 1; i >= 0; i--) { if (numberAsString[i] !== "0") { return numberAsString.slice(0, i + 1); } } return numberAsString; } /** * Converts an integer to an object containing the integer's coefficient and order of magnitude * @param {string} stringInteger the string representation of the integer being converted * @returns {Object} the object containing the integer's coefficient and order of magnitude */ function normalizeInteger(stringInteger) { const significantDigits = removeTrailingZeros(removeLeadingZeros(stringInteger)); return { magnitude: stringInteger.startsWith("0") ? stringInteger.length - 2 : stringInteger.length - 1, coefficient: addDecimalPointToNumber(significantDigits) }; } /** * * Converts a float to an object containing the floats's coefficient and order of magnitude * @param {string} stringFloat the string representation of the float being converted * @returns {Object} the object containing the integer's coefficient and order of magnitude */ function normalizeFloat(stringFloat) { const trimmedFloat = removeLeadingZeros(stringFloat); if (trimmedFloat.startsWith(".")) { const decimalDigits = trimmedFloat.slice(1); const significantDigits = removeLeadingZeros(decimalDigits); return { magnitude: significantDigits.length - decimalDigits.length - 1, coefficient: addDecimalPointToNumber(significantDigits) }; } return { magnitude: trimmedFloat.indexOf(".") - 1, coefficient: addDecimalPointToNumber(trimmedFloat.replace(".", "")) }; } /** * Converts a base ten number to proper scientific notation * @param {string} stringNumber the string representation of the base ten number to be converted * @returns {string} the number converted to scientific notation */ function convertNumberToScientificNotation(stringNumber) { const splitNumber = stringNumber.replace("E", "e").split("e"); const originalCoefficient = splitNumber[0]; const normalizedNumber = stringNumber.includes(".") ? normalizeFloat(originalCoefficient) : normalizeInteger(originalCoefficient); const normalizedCoefficient = normalizedNumber.coefficient; const magnitude = splitNumber.length > 1 ? (parseInt(splitNumber[1], 10) + normalizedNumber.magnitude) : normalizedNumber.magnitude; return `${normalizedCoefficient}e${magnitude}`; } /** * Checks that the user-intended base ten number equals the actual number after is has been converted to the Number type * @param {Node} node the node being evaluated * @returns {boolean} true if they do not match */ function baseTenLosesPrecision(node) { const normalizedRawNumber = convertNumberToScientificNotation(getRaw(node)); const requestedPrecision = normalizedRawNumber.split("e")[0].replace(".", "").length; if (requestedPrecision > 100) { return true; } const storedNumber = node.value.toPrecision(requestedPrecision); const normalizedStoredNumber = convertNumberToScientificNotation(storedNumber); return normalizedRawNumber !== normalizedStoredNumber; } /** * Checks that the user-intended number equals the actual number after is has been converted to the Number type * @param {Node} node the node being evaluated * @returns {boolean} true if they do not match */ function losesPrecision(node) { return isBaseTen(node) ? baseTenLosesPrecision(node) : notBaseTenLosesPrecision(node); } return { Literal(node) { if (node.value && isNumber(node) && losesPrecision(node)) { context.report({ messageId: "noLossOfPrecision", node }); } } }; } };
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