147 lines
19 KiB
JavaScript
147 lines
19 KiB
JavaScript
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'use strict';
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var _docsUrl = require('../docsUrl');
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var _docsUrl2 = _interopRequireDefault(_docsUrl);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) arr2[i] = arr[i]; return arr2; } else { return Array.from(arr); } } /**
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* @fileoverview Rule to disallow namespace import
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* @author Radek Benkel
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*/
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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: 'suggestion',
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docs: {
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url: (0, _docsUrl2.default)('no-namespace')
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},
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fixable: 'code',
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schema: []
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},
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create: function (context) {
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return {
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'ImportNamespaceSpecifier': function (node) {
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const scopeVariables = context.getScope().variables;
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const namespaceVariable = scopeVariables.find(variable => variable.defs[0].node === node);
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const namespaceReferences = namespaceVariable.references;
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const namespaceIdentifiers = namespaceReferences.map(reference => reference.identifier);
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const canFix = namespaceIdentifiers.length > 0 && !usesNamespaceAsObject(namespaceIdentifiers);
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context.report({
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node,
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message: `Unexpected namespace import.`,
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fix: canFix && (fixer => {
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const scopeManager = context.getSourceCode().scopeManager;
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const fixes = [];
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// Pass 1: Collect variable names that are already in scope for each reference we want
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// to transform, so that we can be sure that we choose non-conflicting import names
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const importNameConflicts = {};
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namespaceIdentifiers.forEach(identifier => {
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const parent = identifier.parent;
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if (parent && parent.type === 'MemberExpression') {
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const importName = getMemberPropertyName(parent);
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const localConflicts = getVariableNamesInScope(scopeManager, parent);
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if (!importNameConflicts[importName]) {
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importNameConflicts[importName] = localConflicts;
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} else {
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localConflicts.forEach(c => importNameConflicts[importName].add(c));
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}
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}
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});
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// Choose new names for each import
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const importNames = Object.keys(importNameConflicts);
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const importLocalNames = generateLocalNames(importNames, importNameConflicts, namespaceVariable.name);
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// Replace the ImportNamespaceSpecifier with a list of ImportSpecifiers
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const namedImportSpecifiers = importNames.map(importName => importName === importLocalNames[importName] ? importName : `${importName} as ${importLocalNames[importName]}`);
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fixes.push(fixer.replaceText(node, `{ ${namedImportSpecifiers.join(', ')} }`));
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// Pass 2: Replace references to the namespace with references to the named imports
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namespaceIdentifiers.forEach(identifier => {
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const parent = identifier.parent;
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if (parent && parent.type === 'MemberExpression') {
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const importName = getMemberPropertyName(parent);
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fixes.push(fixer.replaceText(parent, importLocalNames[importName]));
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}
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});
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return fixes;
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})
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});
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}
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};
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}
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/**
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* @param {Identifier[]} namespaceIdentifiers
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* @returns {boolean} `true` if the namespace variable is more than just a glorified constant
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*/
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};function usesNamespaceAsObject(namespaceIdentifiers) {
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return !namespaceIdentifiers.every(identifier => {
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const parent = identifier.parent;
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// `namespace.x` or `namespace['x']`
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return parent && parent.type === 'MemberExpression' && (parent.property.type === 'Identifier' || parent.property.type === 'Literal');
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});
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}
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/**
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* @param {MemberExpression} memberExpression
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* @returns {string} the name of the member in the object expression, e.g. the `x` in `namespace.x`
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*/
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function getMemberPropertyName(memberExpression) {
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return memberExpression.property.type === 'Identifier' ? memberExpression.property.name : memberExpression.property.value;
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}
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/**
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* @param {ScopeManager} scopeManager
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* @param {ASTNode} node
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* @return {Set<string>}
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*/
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function getVariableNamesInScope(scopeManager, node) {
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let currentNode = node;
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let scope = scopeManager.acquire(currentNode);
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while (scope == null) {
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currentNode = currentNode.parent;
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scope = scopeManager.acquire(currentNode, true);
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}
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return new Set([].concat(_toConsumableArray(scope.variables.map(variable => variable.name)), _toConsumableArray(scope.upper.variables.map(variable => variable.name))));
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}
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/**
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*
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* @param {*} names
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* @param {*} nameConflicts
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* @param {*} namespaceName
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*/
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function generateLocalNames(names, nameConflicts, namespaceName) {
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const localNames = {};
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names.forEach(name => {
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let localName;
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if (!nameConflicts[name].has(name)) {
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localName = name;
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} else if (!nameConflicts[name].has(`${namespaceName}_${name}`)) {
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localName = `${namespaceName}_${name}`;
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} else {
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for (let i = 1; i < Infinity; i++) {
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if (!nameConflicts[name].has(`${namespaceName}_${name}_${i}`)) {
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localName = `${namespaceName}_${name}_${i}`;
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break;
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}
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}
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}
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localNames[name] = localName;
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});
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return localNames;
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}
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