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/**
* @fileoverview Validates newlines before and after dots
* @author Greg Cochard
*/
"use strict";
const astUtils = require("../util/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} obj The object owning the property.
* @param {ASTNode} prop The property of the object.
* @param {ASTNode} node The corresponding node of the token.
* @returns {void}
*/
function checkDotLocation(obj, prop, node) {
const dot = sourceCode.getTokenBefore(prop);
const textBeforeDot = sourceCode.getText().slice(obj.range[1], dot.range[0]);
const textAfterDot = sourceCode.getText().slice(dot.range[1], prop.range[0]);
if (dot.type === "Punctuator" && dot.value === ".") {
if (onObject) {
if (!astUtils.isTokenOnSameLine(obj, dot)) {
const neededTextAfterObj = astUtils.isDecimalInteger(obj) ? " " : "";
context.report({
node,
loc: dot.loc.start,
messageId: "expectedDotAfterObject",
fix: fixer => fixer.replaceTextRange([obj.range[1], prop.range[0]], `${neededTextAfterObj}.${textBeforeDot}${textAfterDot}`)
});
}
} else if (!astUtils.isTokenOnSameLine(dot, prop)) {
context.report({
node,
loc: dot.loc.start,
messageId: "expectedDotBeforeProperty",
fix: fixer => fixer.replaceTextRange([obj.range[1], prop.range[0]], `${textBeforeDot}${textAfterDot}.`)
});
}
}
}
/**
* Checks the spacing of the dot within a member expression.
* @param {ASTNode} node The node to check.
* @returns {void}
*/
function checkNode(node) {
checkDotLocation(node.object, node.property, node);
}
return {
MemberExpression: checkNode
};
}
};