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/**
* @fileoverview Validates newlines before and after dots
* @author Greg Cochard
*/
"use strict";
const astUtils = require("./utils/ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "layout",
docs: {
description: "enforce consistent newlines before and after dots",
category: "Best Practices",
recommended: false,
url: "https://eslint.org/docs/rules/dot-location"
},
schema: [
{
enum: ["object", "property"]
}
],
fixable: "code",
messages: {
expectedDotAfterObject: "Expected dot to be on same line as object.",
expectedDotBeforeProperty: "Expected dot to be on same line as property."
}
},
create(context) {
const config = context.options[0];
// default to onObject if no preference is passed
const onObject = config === "object" || !config;
const sourceCode = context.getSourceCode();
/**
* Reports if the dot between object and property is on the correct loccation.
* @param {ASTNode} node The `MemberExpression` node.
* @returns {void}
*/
function checkDotLocation(node) {
const property = node.property;
const dot = sourceCode.getTokenBefore(property);
// `obj` expression can be parenthesized, but those paren tokens are not a part of the `obj` node.
const tokenBeforeDot = sourceCode.getTokenBefore(dot);
const textBeforeDot = sourceCode.getText().slice(tokenBeforeDot.range[1], dot.range[0]);
const textAfterDot = sourceCode.getText().slice(dot.range[1], property.range[0]);
if (onObject) {
if (!astUtils.isTokenOnSameLine(tokenBeforeDot, dot)) {
const neededTextAfterToken = astUtils.isDecimalIntegerNumericToken(tokenBeforeDot) ? " " : "";
context.report({
node,
loc: dot.loc,
messageId: "expectedDotAfterObject",
fix: fixer => fixer.replaceTextRange([tokenBeforeDot.range[1], property.range[0]], `${neededTextAfterToken}.${textBeforeDot}${textAfterDot}`)
});
}
} else if (!astUtils.isTokenOnSameLine(dot, property)) {
context.report({
node,
loc: dot.loc,
messageId: "expectedDotBeforeProperty",
fix: fixer => fixer.replaceTextRange([tokenBeforeDot.range[1], property.range[0]], `${textBeforeDot}${textAfterDot}.`)
});
}
}
/**
* Checks the spacing of the dot within a member expression.
* @param {ASTNode} node The node to check.
* @returns {void}
*/
function checkNode(node) {
if (!node.computed) {
checkDotLocation(node);
}
}
return {
MemberExpression: checkNode
};
}
};
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