mirror of
https://github.com/Sevichecc/Urara-Blog.git
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195 lines
No EOL
7.5 KiB
Text
195 lines
No EOL
7.5 KiB
Text
"use strict";
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var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
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if (k2 === undefined) k2 = k;
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var desc = Object.getOwnPropertyDescriptor(m, k);
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if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
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desc = { enumerable: true, get: function() { return m[k]; } };
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}
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Object.defineProperty(o, k2, desc);
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}) : (function(o, m, k, k2) {
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if (k2 === undefined) k2 = k;
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o[k2] = m[k];
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}));
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var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
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Object.defineProperty(o, "default", { enumerable: true, value: v });
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}) : function(o, v) {
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o["default"] = v;
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});
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var __importStar = (this && this.__importStar) || function (mod) {
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if (mod && mod.__esModule) return mod;
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var result = {};
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if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
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__setModuleDefault(result, mod);
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return result;
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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const utils_1 = require("@typescript-eslint/utils");
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const getESLintCoreRule_1 = require("../util/getESLintCoreRule");
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const util = __importStar(require("../util"));
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const baseRule = (0, getESLintCoreRule_1.getESLintCoreRule)('no-loop-func');
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exports.default = util.createRule({
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name: 'no-loop-func',
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meta: {
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type: 'suggestion',
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docs: {
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description: 'Disallow function declarations that contain unsafe references inside loop statements',
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recommended: false,
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extendsBaseRule: true,
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},
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hasSuggestions: baseRule.meta.hasSuggestions,
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schema: [],
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messages: baseRule.meta.messages,
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},
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defaultOptions: [],
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create(context) {
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/**
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* Reports functions which match the following condition:
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* - has a loop node in ancestors.
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* - has any references which refers to an unsafe variable.
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*
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* @param node The AST node to check.
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* @returns Whether or not the node is within a loop.
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*/
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function checkForLoops(node) {
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const loopNode = getContainingLoopNode(node);
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if (!loopNode) {
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return;
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}
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const references = context.getScope().through;
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const unsafeRefs = references
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.filter(r => !isSafe(loopNode, r))
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.map(r => r.identifier.name);
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if (unsafeRefs.length > 0) {
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context.report({
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node,
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messageId: 'unsafeRefs',
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data: { varNames: `'${unsafeRefs.join("', '")}'` },
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});
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}
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}
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return {
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ArrowFunctionExpression: checkForLoops,
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FunctionExpression: checkForLoops,
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FunctionDeclaration: checkForLoops,
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};
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},
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});
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/**
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* Gets the containing loop node of a specified node.
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*
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* We don't need to check nested functions, so this ignores those.
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* `Scope.through` contains references of nested functions.
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*
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* @param node An AST node to get.
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* @returns The containing loop node of the specified node, or `null`.
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*/
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function getContainingLoopNode(node) {
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for (let currentNode = node; currentNode.parent; currentNode = currentNode.parent) {
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const parent = currentNode.parent;
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switch (parent.type) {
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case utils_1.AST_NODE_TYPES.WhileStatement:
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case utils_1.AST_NODE_TYPES.DoWhileStatement:
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return parent;
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case utils_1.AST_NODE_TYPES.ForStatement:
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// `init` is outside of the loop.
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if (parent.init !== currentNode) {
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return parent;
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}
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break;
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case utils_1.AST_NODE_TYPES.ForInStatement:
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case utils_1.AST_NODE_TYPES.ForOfStatement:
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// `right` is outside of the loop.
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if (parent.right !== currentNode) {
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return parent;
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}
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break;
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case utils_1.AST_NODE_TYPES.ArrowFunctionExpression:
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case utils_1.AST_NODE_TYPES.FunctionExpression:
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case utils_1.AST_NODE_TYPES.FunctionDeclaration:
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// We don't need to check nested functions.
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return null;
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default:
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break;
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}
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}
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return null;
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}
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/**
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* Gets the containing loop node of a given node.
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* If the loop was nested, this returns the most outer loop.
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* @param node A node to get. This is a loop node.
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* @param excludedNode A node that the result node should not include.
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* @returns The most outer loop node.
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*/
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function getTopLoopNode(node, excludedNode) {
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const border = excludedNode ? excludedNode.range[1] : 0;
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let retv = node;
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let containingLoopNode = node;
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while (containingLoopNode && containingLoopNode.range[0] >= border) {
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retv = containingLoopNode;
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containingLoopNode = getContainingLoopNode(containingLoopNode);
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}
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return retv;
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}
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/**
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* Checks whether a given reference which refers to an upper scope's variable is
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* safe or not.
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* @param loopNode A containing loop node.
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* @param reference A reference to check.
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* @returns `true` if the reference is safe or not.
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*/
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function isSafe(loopNode, reference) {
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var _a;
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const variable = reference.resolved;
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const definition = variable === null || variable === void 0 ? void 0 : variable.defs[0];
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const declaration = definition === null || definition === void 0 ? void 0 : definition.parent;
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const kind = (declaration === null || declaration === void 0 ? void 0 : declaration.type) === utils_1.AST_NODE_TYPES.VariableDeclaration
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? declaration.kind
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: '';
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// type references are all safe
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// this only really matters for global types that haven't been configured
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if (reference.isTypeReference) {
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return true;
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}
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// Variables which are declared by `const` is safe.
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if (kind === 'const') {
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return true;
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}
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/*
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* Variables which are declared by `let` in the loop is safe.
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* It's a different instance from the next loop step's.
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*/
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if (kind === 'let' &&
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declaration &&
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declaration.range[0] > loopNode.range[0] &&
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declaration.range[1] < loopNode.range[1]) {
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return true;
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}
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/*
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* WriteReferences which exist after this border are unsafe because those
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* can modify the variable.
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*/
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const border = getTopLoopNode(loopNode, kind === 'let' ? declaration : null)
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.range[0];
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/**
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* Checks whether a given reference is safe or not.
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* The reference is every reference of the upper scope's variable we are
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* looking now.
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*
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* It's safe if the reference matches one of the following condition.
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* - is readonly.
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* - doesn't exist inside a local function and after the border.
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*
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* @param upperRef A reference to check.
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* @returns `true` if the reference is safe.
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*/
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function isSafeReference(upperRef) {
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var _a;
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const id = upperRef.identifier;
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return (!upperRef.isWrite() ||
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(((_a = variable === null || variable === void 0 ? void 0 : variable.scope) === null || _a === void 0 ? void 0 : _a.variableScope) === upperRef.from.variableScope &&
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id.range[0] < border));
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}
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return (_a = variable === null || variable === void 0 ? void 0 : variable.references.every(isSafeReference)) !== null && _a !== void 0 ? _a : false;
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}
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//# sourceMappingURL=no-loop-func.js.map |