no-useless-path-segments.js 16 KB

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  1. 'use strict';
  2. var _ignore = require('eslint-module-utils/ignore');
  3. var _moduleVisitor = require('eslint-module-utils/moduleVisitor');
  4. var _moduleVisitor2 = _interopRequireDefault(_moduleVisitor);
  5. var _resolve = require('eslint-module-utils/resolve');
  6. var _resolve2 = _interopRequireDefault(_resolve);
  7. var _path = require('path');
  8. var _path2 = _interopRequireDefault(_path);
  9. var _docsUrl = require('../docsUrl');
  10. var _docsUrl2 = _interopRequireDefault(_docsUrl);
  11. function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  12. /**
  13. * convert a potentially relative path from node utils into a true
  14. * relative path.
  15. *
  16. * ../ -> ..
  17. * ./ -> .
  18. * .foo/bar -> ./.foo/bar
  19. * ..foo/bar -> ./..foo/bar
  20. * foo/bar -> ./foo/bar
  21. *
  22. * @param relativePath {string} relative posix path potentially missing leading './'
  23. * @returns {string} relative posix path that always starts with a ./
  24. **/
  25. function toRelativePath(relativePath) {
  26. const stripped = relativePath.replace(/\/$/g, ''); // Remove trailing /
  27. return (/^((\.\.)|(\.))($|\/)/.test(stripped) ? stripped : `./${stripped}`
  28. );
  29. } /**
  30. * @fileOverview Ensures that there are no useless path segments
  31. * @author Thomas Grainger
  32. */
  33. function normalize(fn) {
  34. return toRelativePath(_path2.default.posix.normalize(fn));
  35. }
  36. function countRelativeParents(pathSegments) {
  37. return pathSegments.reduce((sum, pathSegment) => pathSegment === '..' ? sum + 1 : sum, 0);
  38. }
  39. module.exports = {
  40. meta: {
  41. type: 'suggestion',
  42. docs: {
  43. url: (0, _docsUrl2.default)('no-useless-path-segments')
  44. },
  45. fixable: 'code',
  46. schema: [{
  47. type: 'object',
  48. properties: {
  49. commonjs: { type: 'boolean' },
  50. noUselessIndex: { type: 'boolean' }
  51. },
  52. additionalProperties: false
  53. }]
  54. },
  55. create(context) {
  56. const currentDir = _path2.default.dirname(context.getFilename());
  57. const options = context.options[0];
  58. function checkSourceValue(source) {
  59. const importPath = source.value;
  60. function reportWithProposedPath(proposedPath) {
  61. context.report({
  62. node: source,
  63. // Note: Using messageIds is not possible due to the support for ESLint 2 and 3
  64. message: `Useless path segments for "${importPath}", should be "${proposedPath}"`,
  65. fix: fixer => proposedPath && fixer.replaceText(source, JSON.stringify(proposedPath))
  66. });
  67. }
  68. // Only relative imports are relevant for this rule --> Skip checking
  69. if (!importPath.startsWith('.')) {
  70. return;
  71. }
  72. // Report rule violation if path is not the shortest possible
  73. const resolvedPath = (0, _resolve2.default)(importPath, context);
  74. const normedPath = normalize(importPath);
  75. const resolvedNormedPath = (0, _resolve2.default)(normedPath, context);
  76. if (normedPath !== importPath && resolvedPath === resolvedNormedPath) {
  77. return reportWithProposedPath(normedPath);
  78. }
  79. const fileExtensions = (0, _ignore.getFileExtensions)(context.settings);
  80. const regexUnnecessaryIndex = new RegExp(`.*\\/index(\\${Array.from(fileExtensions).join('|\\')})?$`);
  81. // Check if path contains unnecessary index (including a configured extension)
  82. if (options && options.noUselessIndex && regexUnnecessaryIndex.test(importPath)) {
  83. const parentDirectory = _path2.default.dirname(importPath);
  84. // Try to find ambiguous imports
  85. if (parentDirectory !== '.' && parentDirectory !== '..') {
  86. for (let fileExtension of fileExtensions) {
  87. if ((0, _resolve2.default)(`${parentDirectory}${fileExtension}`, context)) {
  88. return reportWithProposedPath(`${parentDirectory}/`);
  89. }
  90. }
  91. }
  92. return reportWithProposedPath(parentDirectory);
  93. }
  94. // Path is shortest possible + starts from the current directory --> Return directly
  95. if (importPath.startsWith('./')) {
  96. return;
  97. }
  98. // Path is not existing --> Return directly (following code requires path to be defined)
  99. if (resolvedPath === undefined) {
  100. return;
  101. }
  102. const expected = _path2.default.relative(currentDir, resolvedPath); // Expected import path
  103. const expectedSplit = expected.split(_path2.default.sep); // Split by / or \ (depending on OS)
  104. const importPathSplit = importPath.replace(/^\.\//, '').split('/');
  105. const countImportPathRelativeParents = countRelativeParents(importPathSplit);
  106. const countExpectedRelativeParents = countRelativeParents(expectedSplit);
  107. const diff = countImportPathRelativeParents - countExpectedRelativeParents;
  108. // Same number of relative parents --> Paths are the same --> Return directly
  109. if (diff <= 0) {
  110. return;
  111. }
  112. // Report and propose minimal number of required relative parents
  113. return reportWithProposedPath(toRelativePath(importPathSplit.slice(0, countExpectedRelativeParents).concat(importPathSplit.slice(countImportPathRelativeParents + diff)).join('/')));
  114. }
  115. return (0, _moduleVisitor2.default)(checkSourceValue, options);
  116. }
  117. };
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stripped : `./${stripped}`\n}\n\nfunction normalize(fn) {\n  return toRelativePath(path.posix.normalize(fn))\n}\n\nfunction countRelativeParents(pathSegments) {\n  return pathSegments.reduce((sum, pathSegment) => pathSegment === '..' ? sum + 1 : sum, 0)\n}\n\nmodule.exports = {\n  meta: {\n    type: 'suggestion',\n    docs: {\n      url: docsUrl('no-useless-path-segments'),\n    },\n\n    fixable: 'code',\n\n    schema: [\n      {\n        type: 'object',\n        properties: {\n          commonjs: { type: 'boolean' },\n          noUselessIndex: { type: 'boolean' },\n        },\n        additionalProperties: false,\n      },\n    ],\n  },\n\n  create(context) {\n    const currentDir = path.dirname(context.getFilename())\n    const options = context.options[0]\n\n    function checkSourceValue(source) {\n      const { value: importPath } = source\n\n      function reportWithProposedPath(proposedPath) {\n        context.report({\n          node: source,\n          // Note: Using messageIds is not possible due to the support for ESLint 2 and 3\n          message: `Useless path segments for \"${importPath}\", should be \"${proposedPath}\"`,\n          fix: fixer => proposedPath && fixer.replaceText(source, JSON.stringify(proposedPath)),\n        })\n      }\n\n      // Only relative imports are relevant for this rule --> Skip checking\n      if (!importPath.startsWith('.')) {\n        return\n      }\n\n      // Report rule violation if path is not the shortest possible\n      const resolvedPath = resolve(importPath, context)\n      const normedPath = normalize(importPath)\n      const resolvedNormedPath = resolve(normedPath, context)\n      if (normedPath !== importPath && resolvedPath === resolvedNormedPath) {\n        return reportWithProposedPath(normedPath)\n      }\n\n      const fileExtensions = getFileExtensions(context.settings)\n      const regexUnnecessaryIndex = new RegExp(\n        `.*\\\\/index(\\\\${Array.from(fileExtensions).join('|\\\\')})?$`\n      )\n\n      // Check if path contains unnecessary index (including a configured extension)\n      if (options && options.noUselessIndex && regexUnnecessaryIndex.test(importPath)) {\n        const parentDirectory = path.dirname(importPath)\n\n        // Try to find ambiguous imports\n        if (parentDirectory !== '.' && parentDirectory !== '..') {\n          for (let fileExtension of fileExtensions) {\n            if (resolve(`${parentDirectory}${fileExtension}`, context)) {\n              return reportWithProposedPath(`${parentDirectory}/`)\n            }\n          }\n        }\n\n        return reportWithProposedPath(parentDirectory)\n      }\n\n      // Path is shortest possible + starts from the current directory --> Return directly\n      if (importPath.startsWith('./')) {\n        return\n      }\n\n      // Path is not existing --> Return directly (following code requires path to be defined)\n      if (resolvedPath === undefined) {\n        return\n      }\n\n      const expected = path.relative(currentDir, resolvedPath) // Expected import path\n      const expectedSplit = expected.split(path.sep) // Split by / or \\ (depending on OS)\n      const importPathSplit = importPath.replace(/^\\.\\//, '').split('/')\n      const countImportPathRelativeParents = countRelativeParents(importPathSplit)\n      const countExpectedRelativeParents = countRelativeParents(expectedSplit)\n      const diff = countImportPathRelativeParents - countExpectedRelativeParents\n\n      // Same number of relative parents --> Paths are the same --> Return directly\n      if (diff <= 0) {\n        return\n      }\n\n      // Report and propose minimal number of required relative parents\n      return reportWithProposedPath(\n        toRelativePath(\n          importPathSplit\n            .slice(0, countExpectedRelativeParents)\n            .concat(importPathSplit.slice(countImportPathRelativeParents + diff))\n            .join('/')\n        )\n      )\n    }\n\n    return moduleVisitor(checkSourceValue, options)\n  },\n}\n"]}