no-namespace.js 20 KB

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  1. 'use strict';
  2. 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);}} /**
  3. * @fileoverview Rule to disallow namespace import
  4. * @author Radek Benkel
  5. */ //------------------------------------------------------------------------------
  6. // Rule Definition
  7. //------------------------------------------------------------------------------
  8. module.exports = {
  9. meta: {
  10. type: 'suggestion',
  11. docs: {
  12. url: (0, _docsUrl2.default)('no-namespace') },
  13. fixable: 'code',
  14. schema: [] },
  15. create: function (context) {
  16. return {
  17. 'ImportNamespaceSpecifier': function (node) {
  18. const scopeVariables = context.getScope().variables;
  19. const namespaceVariable = scopeVariables.find(variable =>
  20. variable.defs[0].node === node);
  21. const namespaceReferences = namespaceVariable.references;
  22. const namespaceIdentifiers = namespaceReferences.map(reference => reference.identifier);
  23. const canFix = namespaceIdentifiers.length > 0 && !usesNamespaceAsObject(namespaceIdentifiers);
  24. context.report({
  25. node,
  26. message: `Unexpected namespace import.`,
  27. fix: canFix && (fixer => {
  28. const scopeManager = context.getSourceCode().scopeManager;
  29. const fixes = [];
  30. // Pass 1: Collect variable names that are already in scope for each reference we want
  31. // to transform, so that we can be sure that we choose non-conflicting import names
  32. const importNameConflicts = {};
  33. namespaceIdentifiers.forEach(identifier => {
  34. const parent = identifier.parent;
  35. if (parent && parent.type === 'MemberExpression') {
  36. const importName = getMemberPropertyName(parent);
  37. const localConflicts = getVariableNamesInScope(scopeManager, parent);
  38. if (!importNameConflicts[importName]) {
  39. importNameConflicts[importName] = localConflicts;
  40. } else {
  41. localConflicts.forEach(c => importNameConflicts[importName].add(c));
  42. }
  43. }
  44. });
  45. // Choose new names for each import
  46. const importNames = Object.keys(importNameConflicts);
  47. const importLocalNames = generateLocalNames(
  48. importNames,
  49. importNameConflicts,
  50. namespaceVariable.name);
  51. // Replace the ImportNamespaceSpecifier with a list of ImportSpecifiers
  52. const namedImportSpecifiers = importNames.map(importName =>
  53. importName === importLocalNames[importName] ?
  54. importName :
  55. `${importName} as ${importLocalNames[importName]}`);
  56. fixes.push(fixer.replaceText(node, `{ ${namedImportSpecifiers.join(', ')} }`));
  57. // Pass 2: Replace references to the namespace with references to the named imports
  58. namespaceIdentifiers.forEach(identifier => {
  59. const parent = identifier.parent;
  60. if (parent && parent.type === 'MemberExpression') {
  61. const importName = getMemberPropertyName(parent);
  62. fixes.push(fixer.replaceText(parent, importLocalNames[importName]));
  63. }
  64. });
  65. return fixes;
  66. }) });
  67. } };
  68. } };
  69. /**
  70. * @param {Identifier[]} namespaceIdentifiers
  71. * @returns {boolean} `true` if the namespace variable is more than just a glorified constant
  72. */
  73. function usesNamespaceAsObject(namespaceIdentifiers) {
  74. return !namespaceIdentifiers.every(identifier => {
  75. const parent = identifier.parent;
  76. // `namespace.x` or `namespace['x']`
  77. return (
  78. parent && parent.type === 'MemberExpression' && (
  79. parent.property.type === 'Identifier' || parent.property.type === 'Literal'));
  80. });
  81. }
  82. /**
  83. * @param {MemberExpression} memberExpression
  84. * @returns {string} the name of the member in the object expression, e.g. the `x` in `namespace.x`
  85. */
  86. function getMemberPropertyName(memberExpression) {
  87. return memberExpression.property.type === 'Identifier' ?
  88. memberExpression.property.name :
  89. memberExpression.property.value;
  90. }
  91. /**
  92. * @param {ScopeManager} scopeManager
  93. * @param {ASTNode} node
  94. * @return {Set<string>}
  95. */
  96. function getVariableNamesInScope(scopeManager, node) {
  97. let currentNode = node;
  98. let scope = scopeManager.acquire(currentNode);
  99. while (scope == null) {
  100. currentNode = currentNode.parent;
  101. scope = scopeManager.acquire(currentNode, true);
  102. }
  103. return new Set([].concat(_toConsumableArray(
  104. scope.variables.map(variable => variable.name)), _toConsumableArray(
  105. scope.upper.variables.map(variable => variable.name))));
  106. }
  107. /**
  108. *
  109. * @param {*} names
  110. * @param {*} nameConflicts
  111. * @param {*} namespaceName
  112. */
  113. function generateLocalNames(names, nameConflicts, namespaceName) {
  114. const localNames = {};
  115. names.forEach(name => {
  116. let localName;
  117. if (!nameConflicts[name].has(name)) {
  118. localName = name;
  119. } else if (!nameConflicts[name].has(`${namespaceName}_${name}`)) {
  120. localName = `${namespaceName}_${name}`;
  121. } else {
  122. for (let i = 1; i < Infinity; i++) {
  123. if (!nameConflicts[name].has(`${namespaceName}_${name}_${i}`)) {
  124. localName = `${namespaceName}_${name}_${i}`;
  125. break;
  126. }
  127. }
  128. }
  129. localNames[name] = localName;
  130. });
  131. return localNames;
  132. }
  133. //# 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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    schema: [],\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"]}