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