106 lines
3.3 KiB
JavaScript
106 lines
3.3 KiB
JavaScript
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/**
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* @fileoverview Validates newlines before and after dots
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* @author Greg Cochard
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*/
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"use strict";
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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: "enforce consistent newlines before and after dots",
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category: "Best Practices",
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recommended: false,
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url: "https://eslint.org/docs/rules/dot-location"
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},
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schema: [
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{
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enum: ["object", "property"]
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}
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],
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fixable: "code",
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messages: {
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expectedDotAfterObject: "Expected dot to be on same line as object.",
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expectedDotBeforeProperty: "Expected dot to be on same line as property."
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}
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},
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create(context) {
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const config = context.options[0];
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// default to onObject if no preference is passed
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const onObject = config === "object" || !config;
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const sourceCode = context.getSourceCode();
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/**
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* Reports if the dot between object and property is on the correct location.
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* @param {ASTNode} node The `MemberExpression` node.
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* @returns {void}
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*/
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function checkDotLocation(node) {
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const property = node.property;
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const dotToken = sourceCode.getTokenBefore(property);
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if (onObject) {
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// `obj` expression can be parenthesized, but those paren tokens are not a part of the `obj` node.
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const tokenBeforeDot = sourceCode.getTokenBefore(dotToken);
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if (!astUtils.isTokenOnSameLine(tokenBeforeDot, dotToken)) {
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context.report({
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node,
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loc: dotToken.loc,
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messageId: "expectedDotAfterObject",
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*fix(fixer) {
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if (dotToken.value.startsWith(".") && astUtils.isDecimalIntegerNumericToken(tokenBeforeDot)) {
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yield fixer.insertTextAfter(tokenBeforeDot, ` ${dotToken.value}`);
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} else {
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yield fixer.insertTextAfter(tokenBeforeDot, dotToken.value);
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}
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yield fixer.remove(dotToken);
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}
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});
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}
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} else if (!astUtils.isTokenOnSameLine(dotToken, property)) {
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context.report({
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node,
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loc: dotToken.loc,
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messageId: "expectedDotBeforeProperty",
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*fix(fixer) {
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yield fixer.remove(dotToken);
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yield fixer.insertTextBefore(property, dotToken.value);
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}
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});
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}
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}
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/**
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* Checks the spacing of the dot within a member expression.
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* @param {ASTNode} node The node to check.
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* @returns {void}
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*/
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function checkNode(node) {
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if (!node.computed) {
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checkDotLocation(node);
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}
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}
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return {
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MemberExpression: checkNode
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};
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}
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};
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