71 lines
2.3 KiB
JavaScript
71 lines
2.3 KiB
JavaScript
|
/**
|
||
|
|
* @fileoverview Rule to flag use of a leading/trailing decimal point in a numeric literal
|
||
|
|
* @author James Allardice
|
||
|
|
*/
|
||
|
|
|
||
|
|
"use strict";
|
||
|
|
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
// Requirements
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
const astUtils = require("./utils/ast-utils");
|
||
|
|
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
// Rule Definition
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
/** @type {import('../shared/types').Rule} */
|
||
|
|
module.exports = {
|
||
|
|
meta: {
|
||
|
|
type: "suggestion",
|
||
|
|
|
||
|
|
docs: {
|
||
|
|
description: "disallow leading or trailing decimal points in numeric literals",
|
||
|
|
recommended: false,
|
||
|
|
url: "https://eslint.org/docs/rules/no-floating-decimal"
|
||
|
|
},
|
||
|
|
|
||
|
|
schema: [],
|
||
|
|
fixable: "code",
|
||
|
|
messages: {
|
||
|
|
leading: "A leading decimal point can be confused with a dot.",
|
||
|
|
trailing: "A trailing decimal point can be confused with a dot."
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
create(context) {
|
||
|
|
const sourceCode = context.getSourceCode();
|
||
|
|
|
||
|
|
return {
|
||
|
|
Literal(node) {
|
||
|
|
|
||
|
|
if (typeof node.value === "number") {
|
||
|
|
if (node.raw.startsWith(".")) {
|
||
|
|
context.report({
|
||
|
|
node,
|
||
|
|
messageId: "leading",
|
||
|
|
fix(fixer) {
|
||
|
|
const tokenBefore = sourceCode.getTokenBefore(node);
|
||
|
|
const needsSpaceBefore = tokenBefore &&
|
||
|
|
tokenBefore.range[1] === node.range[0] &&
|
||
|
|
!astUtils.canTokensBeAdjacent(tokenBefore, `0${node.raw}`);
|
||
|
|
|
||
|
|
return fixer.insertTextBefore(node, needsSpaceBefore ? " 0" : "0");
|
||
|
|
}
|
||
|
|
});
|
||
|
|
}
|
||
|
|
if (node.raw.indexOf(".") === node.raw.length - 1) {
|
||
|
|
context.report({
|
||
|
|
node,
|
||
|
|
messageId: "trailing",
|
||
|
|
fix: fixer => fixer.insertTextAfter(node, "0")
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
}
|
||
|
|
};
|