dot-notation.js
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/**
* @fileoverview Rule to warn about using dot notation instead of square bracket notation when possible.
* @author Josh Perez
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const astUtils = require("../ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
const validIdentifier = /^[a-zA-Z_$][a-zA-Z0-9_$]*$/;
const keywords = require("../util/keywords");
module.exports = {
meta: {
docs: {
description: "enforce dot notation whenever possible",
category: "Best Practices",
recommended: false
},
schema: [
{
type: "object",
properties: {
allowKeywords: {
type: "boolean"
},
allowPattern: {
type: "string"
}
},
additionalProperties: false
}
],
fixable: "code"
},
create(context) {
const options = context.options[0] || {};
const allowKeywords = options.allowKeywords === void 0 || !!options.allowKeywords;
const sourceCode = context.getSourceCode();
let allowPattern;
if (options.allowPattern) {
allowPattern = new RegExp(options.allowPattern);
}
return {
MemberExpression(node) {
if (
node.computed &&
node.property.type === "Literal" &&
validIdentifier.test(node.property.value) &&
(allowKeywords || keywords.indexOf(String(node.property.value)) === -1)
) {
if (!(allowPattern && allowPattern.test(node.property.value))) {
context.report({
node: node.property,
message: "[{{propertyValue}}] is better written in dot notation.",
data: {
propertyValue: JSON.stringify(node.property.value)
},
fix(fixer) {
const leftBracket = sourceCode.getTokenAfter(node.object, astUtils.isOpeningBracketToken);
const rightBracket = sourceCode.getLastToken(node);
if (sourceCode.getFirstTokenBetween(leftBracket, rightBracket, { includeComments: true, filter: astUtils.isCommentToken })) {
// Don't perform any fixes if there are comments inside the brackets.
return null;
}
const textBeforeDot = astUtils.isDecimalInteger(node.object) ? " " : "";
return fixer.replaceTextRange(
[leftBracket.range[0], rightBracket.range[1]],
`${textBeforeDot}.${node.property.value}`
);
}
});
}
}
if (
!allowKeywords &&
!node.computed &&
keywords.indexOf(String(node.property.name)) !== -1
) {
context.report({
node: node.property,
message: ".{{propertyName}} is a syntax error.",
data: {
propertyName: node.property.name
},
fix(fixer) {
const dot = sourceCode.getTokenBefore(node.property);
const textAfterDot = sourceCode.text.slice(dot.range[1], node.property.range[0]);
if (textAfterDot.trim()) {
// Don't perform any fixes if there are comments between the dot and the property name.
return null;
}
return fixer.replaceTextRange(
[dot.range[0], node.property.range[1]],
`[${textAfterDot}"${node.property.name}"]`
);
}
});
}
}
};
}
};