80 lines
2.3 KiB
JavaScript
80 lines
2.3 KiB
JavaScript
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'use strict';
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const {isParenthesized} = require('@eslint-community/eslint-utils');
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const needsSemicolon = require('./utils/needs-semicolon.js');
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const {isDecimalInteger} = require('./utils/numeric.js');
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const toLocation = require('./utils/to-location.js');
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const {fixSpaceAroundKeyword} = require('./fix/index.js');
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const {isNumberLiteral} = require('./ast/index.js');
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const MESSAGE_ZERO_FRACTION = 'zero-fraction';
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const MESSAGE_DANGLING_DOT = 'dangling-dot';
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const messages = {
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[MESSAGE_ZERO_FRACTION]: 'Don\'t use a zero fraction in the number.',
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[MESSAGE_DANGLING_DOT]: 'Don\'t use a dangling dot in the number.',
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};
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/** @param {import('eslint').Rule.RuleContext} context */
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const create = context => ({
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Literal(node) {
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if (!isNumberLiteral(node)) {
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return;
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}
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// Legacy octal number `0777` and prefixed number `0o1234` cannot have a dot.
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const {raw} = node;
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const match = raw.match(/^(?<before>[\d_]*)(?<dotAndFractions>\.[\d_]*)(?<after>.*)$/);
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if (!match) {
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return;
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}
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const {before, dotAndFractions, after} = match.groups;
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const fixedDotAndFractions = dotAndFractions.replace(/[.0_]+$/g, '');
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const formatted = ((before + fixedDotAndFractions) || '0') + after;
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if (formatted === raw) {
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return;
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}
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const isDanglingDot = dotAndFractions === '.';
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// End of fractions
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const end = node.range[0] + before.length + dotAndFractions.length;
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const start = end - (raw.length - formatted.length);
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const sourceCode = context.getSourceCode();
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return {
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loc: toLocation([start, end], sourceCode),
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messageId: isDanglingDot ? MESSAGE_DANGLING_DOT : MESSAGE_ZERO_FRACTION,
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* fix(fixer) {
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let fixed = formatted;
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if (
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node.parent.type === 'MemberExpression'
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&& node.parent.object === node
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&& isDecimalInteger(formatted)
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&& !isParenthesized(node, sourceCode)
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) {
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fixed = `(${fixed})`;
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if (needsSemicolon(sourceCode.getTokenBefore(node), sourceCode, fixed)) {
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fixed = `;${fixed}`;
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}
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}
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yield fixer.replaceText(node, fixed);
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yield * fixSpaceAroundKeyword(fixer, node, sourceCode);
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},
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};
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},
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});
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/** @type {import('eslint').Rule.RuleModule} */
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module.exports = {
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create,
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meta: {
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type: 'suggestion',
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docs: {
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description: 'Disallow number literals with zero fractions or dangling dots.',
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},
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fixable: 'code',
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messages,
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},
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};
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