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