'use strict';

var _docsUrl = require('../docsUrl');

var _docsUrl2 = _interopRequireDefault(_docsUrl);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

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); } } /**
                                                                                                                                                                                                 * @fileoverview Rule to disallow namespace import
                                                                                                                                                                                                 * @author Radek Benkel
                                                                                                                                                                                                 */

//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------


module.exports = {
  meta: {
    type: 'suggestion',
    docs: {
      url: (0, _docsUrl2.default)('no-namespace')
    },
    fixable: 'code'
  },

  create: function (context) {
    return {
      'ImportNamespaceSpecifier': function (node) {
        const scopeVariables = context.getScope().variables;
        const namespaceVariable = scopeVariables.find(variable => variable.defs[0].node === node);
        const namespaceReferences = namespaceVariable.references;
        const namespaceIdentifiers = namespaceReferences.map(reference => reference.identifier);
        const canFix = namespaceIdentifiers.length > 0 && !usesNamespaceAsObject(namespaceIdentifiers);

        context.report({
          node,
          message: `Unexpected namespace import.`,
          fix: canFix && (fixer => {
            const scopeManager = context.getSourceCode().scopeManager;
            const fixes = [];

            // Pass 1: Collect variable names that are already in scope for each reference we want
            // to transform, so that we can be sure that we choose non-conflicting import names
            const importNameConflicts = {};
            namespaceIdentifiers.forEach(identifier => {
              const parent = identifier.parent;
              if (parent && parent.type === 'MemberExpression') {
                const importName = getMemberPropertyName(parent);
                const localConflicts = getVariableNamesInScope(scopeManager, parent);
                if (!importNameConflicts[importName]) {
                  importNameConflicts[importName] = localConflicts;
                } else {
                  localConflicts.forEach(c => importNameConflicts[importName].add(c));
                }
              }
            });

            // Choose new names for each import
            const importNames = Object.keys(importNameConflicts);
            const importLocalNames = generateLocalNames(importNames, importNameConflicts, namespaceVariable.name);

            // Replace the ImportNamespaceSpecifier with a list of ImportSpecifiers
            const namedImportSpecifiers = importNames.map(importName => importName === importLocalNames[importName] ? importName : `${importName} as ${importLocalNames[importName]}`);
            fixes.push(fixer.replaceText(node, `{ ${namedImportSpecifiers.join(', ')} }`));

            // Pass 2: Replace references to the namespace with references to the named imports
            namespaceIdentifiers.forEach(identifier => {
              const parent = identifier.parent;
              if (parent && parent.type === 'MemberExpression') {
                const importName = getMemberPropertyName(parent);
                fixes.push(fixer.replaceText(parent, importLocalNames[importName]));
              }
            });

            return fixes;
          })
        });
      }
    };
  }

  /**
   * @param {Identifier[]} namespaceIdentifiers
   * @returns {boolean} `true` if the namespace variable is more than just a glorified constant
   */
};function usesNamespaceAsObject(namespaceIdentifiers) {
  return !namespaceIdentifiers.every(identifier => {
    const parent = identifier.parent;

    // `namespace.x` or `namespace['x']`
    return parent && parent.type === 'MemberExpression' && (parent.property.type === 'Identifier' || parent.property.type === 'Literal');
  });
}

/**
 * @param {MemberExpression} memberExpression
 * @returns {string} the name of the member in the object expression, e.g. the `x` in `namespace.x`
 */
function getMemberPropertyName(memberExpression) {
  return memberExpression.property.type === 'Identifier' ? memberExpression.property.name : memberExpression.property.value;
}

/**
 * @param {ScopeManager} scopeManager
 * @param {ASTNode} node
 * @return {Set<string>}
 */
function getVariableNamesInScope(scopeManager, node) {
  let currentNode = node;
  let scope = scopeManager.acquire(currentNode);
  while (scope == null) {
    currentNode = currentNode.parent;
    scope = scopeManager.acquire(currentNode, true);
  }
  return new Set([].concat(_toConsumableArray(scope.variables.map(variable => variable.name)), _toConsumableArray(scope.upper.variables.map(variable => variable.name))));
}

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