/**
|
* @fileoverview Rule to spot scenarios where a newline looks like it is ending a statement, but is not.
|
* @author Glen Mailer
|
*/
|
"use strict";
|
|
//------------------------------------------------------------------------------
|
// Requirements
|
//------------------------------------------------------------------------------
|
|
const astUtils = require("./utils/ast-utils");
|
|
//------------------------------------------------------------------------------
|
// Rule Definition
|
//------------------------------------------------------------------------------
|
|
module.exports = {
|
meta: {
|
type: "problem",
|
|
docs: {
|
description: "disallow confusing multiline expressions",
|
category: "Possible Errors",
|
recommended: true,
|
url: "https://eslint.org/docs/rules/no-unexpected-multiline"
|
},
|
|
schema: [],
|
messages: {
|
function: "Unexpected newline between function and ( of function call.",
|
property: "Unexpected newline between object and [ of property access.",
|
taggedTemplate: "Unexpected newline between template tag and template literal.",
|
division: "Unexpected newline between numerator and division operator."
|
}
|
},
|
|
create(context) {
|
|
const REGEX_FLAG_MATCHER = /^[gimsuy]+$/u;
|
|
const sourceCode = context.getSourceCode();
|
|
/**
|
* Check to see if there is a newline between the node and the following open bracket
|
* line's expression
|
* @param {ASTNode} node The node to check.
|
* @param {string} messageId The error messageId to use.
|
* @returns {void}
|
* @private
|
*/
|
function checkForBreakAfter(node, messageId) {
|
const openParen = sourceCode.getTokenAfter(node, astUtils.isNotClosingParenToken);
|
const nodeExpressionEnd = sourceCode.getTokenBefore(openParen);
|
|
if (openParen.loc.start.line !== nodeExpressionEnd.loc.end.line) {
|
context.report({
|
node,
|
loc: openParen.loc,
|
messageId
|
});
|
}
|
}
|
|
//--------------------------------------------------------------------------
|
// Public API
|
//--------------------------------------------------------------------------
|
|
return {
|
|
MemberExpression(node) {
|
if (!node.computed || node.optional) {
|
return;
|
}
|
checkForBreakAfter(node.object, "property");
|
},
|
|
TaggedTemplateExpression(node) {
|
const { quasi } = node;
|
|
// handles common tags, parenthesized tags, and typescript's generic type arguments
|
const tokenBefore = sourceCode.getTokenBefore(quasi);
|
|
if (tokenBefore.loc.end.line !== quasi.loc.start.line) {
|
context.report({
|
node,
|
loc: {
|
start: quasi.loc.start,
|
end: {
|
line: quasi.loc.start.line,
|
column: quasi.loc.start.column + 1
|
}
|
},
|
messageId: "taggedTemplate"
|
});
|
}
|
},
|
|
CallExpression(node) {
|
if (node.arguments.length === 0 || node.optional) {
|
return;
|
}
|
checkForBreakAfter(node.callee, "function");
|
},
|
|
"BinaryExpression[operator='/'] > BinaryExpression[operator='/'].left"(node) {
|
const secondSlash = sourceCode.getTokenAfter(node, token => token.value === "/");
|
const tokenAfterOperator = sourceCode.getTokenAfter(secondSlash);
|
|
if (
|
tokenAfterOperator.type === "Identifier" &&
|
REGEX_FLAG_MATCHER.test(tokenAfterOperator.value) &&
|
secondSlash.range[1] === tokenAfterOperator.range[0]
|
) {
|
checkForBreakAfter(node.left, "division");
|
}
|
}
|
};
|
|
}
|
};
|
