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