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/**
* @fileoverview Rule to disallow whitespace before properties
* @author Kai Cataldo
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const astUtils = require("./utils/ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "layout",
docs: {
description: "disallow whitespace before properties",
category: "Stylistic Issues",
recommended: false,
url: "https://eslint.org/docs/rules/no-whitespace-before-property"
},
fixable: "whitespace",
schema: []
},
create(context) {
const sourceCode = context.getSourceCode();
//--------------------------------------------------------------------------
// Helpers
//--------------------------------------------------------------------------
/**
* Reports whitespace before property token
* @param {ASTNode} node - the node to report in the event of an error
* @param {Token} leftToken - the left token
* @param {Token} rightToken - the right token
* @returns {void}
* @private
*/
function reportError(node, leftToken, rightToken) {
const replacementText = node.computed ? "" : ".";
context.report({
node,
message: "Unexpected whitespace before property {{propName}}.",
data: {
propName: sourceCode.getText(node.property)
},
fix(fixer) {
if (!node.computed && astUtils.isDecimalInteger(node.object)) {
/*
* If the object is a number literal, fixing it to something like 5.toString() would cause a SyntaxError.
* Don't fix this case.
*/
return null;
}
return fixer.replaceTextRange([leftToken.range[1], rightToken.range[0]], replacementText);
}
});
}
//--------------------------------------------------------------------------
// Public
//--------------------------------------------------------------------------
return {
MemberExpression(node) {
let rightToken;
let leftToken;
if (!astUtils.isTokenOnSameLine(node.object, node.property)) {
return;
}
if (node.computed) {
rightToken = sourceCode.getTokenBefore(node.property, astUtils.isOpeningBracketToken);
leftToken = sourceCode.getTokenBefore(rightToken);
} else {
rightToken = sourceCode.getFirstToken(node.property);
leftToken = sourceCode.getTokenBefore(rightToken, 1);
}
if (sourceCode.isSpaceBetweenTokens(leftToken, rightToken)) {
reportError(node, leftToken, rightToken);
}
}
};
}
};
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