'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.recursivePatternCapture = recursivePatternCapture;

var _fs = require('fs');

var _fs2 = _interopRequireDefault(_fs);

var _doctrine = require('doctrine');

var _doctrine2 = _interopRequireDefault(_doctrine);

var _debug = require('debug');

var _debug2 = _interopRequireDefault(_debug);

var _sourceCode = require('eslint/lib/util/source-code');

var _sourceCode2 = _interopRequireDefault(_sourceCode);

var _parse = require('eslint-module-utils/parse');

var _parse2 = _interopRequireDefault(_parse);

var _resolve = require('eslint-module-utils/resolve');

var _resolve2 = _interopRequireDefault(_resolve);

var _ignore = require('eslint-module-utils/ignore');

var _ignore2 = _interopRequireDefault(_ignore);

var _hash = require('eslint-module-utils/hash');

var _unambiguous = require('eslint-module-utils/unambiguous');

var unambiguous = _interopRequireWildcard(_unambiguous);

function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }

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

const log = (0, _debug2.default)('eslint-plugin-import:ExportMap');

const exportCache = new Map();

class ExportMap {
  constructor(path) {
    this.path = path;
    this.namespace = new Map();
    // todo: restructure to key on path, value is resolver + map of names
    this.reexports = new Map();
    /**
     * star-exports
     * @type {Set} of () => ExportMap
     */
    this.dependencies = new Set();
    /**
     * dependencies of this module that are not explicitly re-exported
     * @type {Map} from path = () => ExportMap
     */
    this.imports = new Map();
    this.errors = [];
  }

  get hasDefault() {
    return this.get('default') != null;
  } // stronger than this.has

  get size() {
    let size = this.namespace.size + this.reexports.size;
    this.dependencies.forEach(dep => {
      const d = dep();
      // CJS / ignored dependencies won't exist (#717)
      if (d == null) return;
      size += d.size;
    });
    return size;
  }

  /**
   * Note that this does not check explicitly re-exported names for existence
   * in the base namespace, but it will expand all `export * from '...'` exports
   * if not found in the explicit namespace.
   * @param  {string}  name
   * @return {Boolean} true if `name` is exported by this module.
   */
  has(name) {
    if (this.namespace.has(name)) return true;
    if (this.reexports.has(name)) return true;

    // default exports must be explicitly re-exported (#328)
    if (name !== 'default') {
      for (let dep of this.dependencies) {
        let innerMap = dep();

        // todo: report as unresolved?
        if (!innerMap) continue;

        if (innerMap.has(name)) return true;
      }
    }

    return false;
  }

  /**
   * ensure that imported name fully resolves.
   * @param  {[type]}  name [description]
   * @return {Boolean}      [description]
   */
  hasDeep(name) {
    if (this.namespace.has(name)) return { found: true, path: [this] };

    if (this.reexports.has(name)) {
      const reexports = this.reexports.get(name),
            imported = reexports.getImport();

      // if import is ignored, return explicit 'null'
      if (imported == null) return { found: true, path: [this]

        // safeguard against cycles, only if name matches
      };if (imported.path === this.path && reexports.local === name) {
        return { found: false, path: [this] };
      }

      const deep = imported.hasDeep(reexports.local);
      deep.path.unshift(this);

      return deep;
    }

    // default exports must be explicitly re-exported (#328)
    if (name !== 'default') {
      for (let dep of this.dependencies) {
        let innerMap = dep();
        // todo: report as unresolved?
        if (!innerMap) continue;

        // safeguard against cycles
        if (innerMap.path === this.path) continue;

        let innerValue = innerMap.hasDeep(name);
        if (innerValue.found) {
          innerValue.path.unshift(this);
          return innerValue;
        }
      }
    }

    return { found: false, path: [this] };
  }

  get(name) {
    if (this.namespace.has(name)) return this.namespace.get(name);

    if (this.reexports.has(name)) {
      const reexports = this.reexports.get(name),
            imported = reexports.getImport();

      // if import is ignored, return explicit 'null'
      if (imported == null) return null;

      // safeguard against cycles, only if name matches
      if (imported.path === this.path && reexports.local === name) return undefined;

      return imported.get(reexports.local);
    }

    // default exports must be explicitly re-exported (#328)
    if (name !== 'default') {
      for (let dep of this.dependencies) {
        let innerMap = dep();
        // todo: report as unresolved?
        if (!innerMap) continue;

        // safeguard against cycles
        if (innerMap.path === this.path) continue;

        let innerValue = innerMap.get(name);
        if (innerValue !== undefined) return innerValue;
      }
    }

    return undefined;
  }

  forEach(callback, thisArg) {
    this.namespace.forEach((v, n) => callback.call(thisArg, v, n, this));

    this.reexports.forEach((reexports, name) => {
      const reexported = reexports.getImport();
      // can't look up meta for ignored re-exports (#348)
      callback.call(thisArg, reexported && reexported.get(reexports.local), name, this);
    });

    this.dependencies.forEach(dep => {
      const d = dep();
      // CJS / ignored dependencies won't exist (#717)
      if (d == null) return;

      d.forEach((v, n) => n !== 'default' && callback.call(thisArg, v, n, this));
    });
  }

  // todo: keys, values, entries?

  reportErrors(context, declaration) {
    context.report({
      node: declaration.source,
      message: `Parse errors in imported module '${declaration.source.value}': ` + `${this.errors.map(e => `${e.message} (${e.lineNumber}:${e.column})`).join(', ')}`
    });
  }
}

exports.default = ExportMap; /**
                              * parse docs from the first node that has leading comments
                              */

function captureDoc(source, docStyleParsers) {
  const metadata = {};

  // 'some' short-circuits on first 'true'

  for (var _len = arguments.length, nodes = Array(_len > 2 ? _len - 2 : 0), _key = 2; _key < _len; _key++) {
    nodes[_key - 2] = arguments[_key];
  }

  nodes.some(n => {
    try {

      let leadingComments;

      // n.leadingComments is legacy `attachComments` behavior
      if ('leadingComments' in n) {
        leadingComments = n.leadingComments;
      } else if (n.range) {
        leadingComments = source.getCommentsBefore(n);
      }

      if (!leadingComments || leadingComments.length === 0) return false;

      for (let name in docStyleParsers) {
        const doc = docStyleParsers[name](leadingComments);
        if (doc) {
          metadata.doc = doc;
        }
      }

      return true;
    } catch (err) {
      return false;
    }
  });

  return metadata;
}

const availableDocStyleParsers = {
  jsdoc: captureJsDoc,
  tomdoc: captureTomDoc

  /**
   * parse JSDoc from leading comments
   * @param  {...[type]} comments [description]
   * @return {{doc: object}}
   */
};function captureJsDoc(comments) {
  let doc;

  // capture XSDoc
  comments.forEach(comment => {
    // skip non-block comments
    if (comment.value.slice(0, 4) !== '*\n *') return;
    try {
      doc = _doctrine2.default.parse(comment.value, { unwrap: true });
    } catch (err) {
      /* don't care, for now? maybe add to `errors?` */
    }
  });

  return doc;
}

/**
  * parse TomDoc section from comments
  */
function captureTomDoc(comments) {
  // collect lines up to first paragraph break
  const lines = [];
  for (let i = 0; i < comments.length; i++) {
    const comment = comments[i];
    if (comment.value.match(/^\s*$/)) break;
    lines.push(comment.value.trim());
  }

  // return doctrine-like object
  const statusMatch = lines.join(' ').match(/^(Public|Internal|Deprecated):\s*(.+)/);
  if (statusMatch) {
    return {
      description: statusMatch[2],
      tags: [{
        title: statusMatch[1].toLowerCase(),
        description: statusMatch[2]
      }]
    };
  }
}

ExportMap.get = function (source, context) {
  const path = (0, _resolve2.default)(source, context);
  if (path == null) return null;

  return ExportMap.for(childContext(path, context));
};

ExportMap.for = function (context) {
  const path = context.path;


  const cacheKey = (0, _hash.hashObject)(context).digest('hex');
  let exportMap = exportCache.get(cacheKey);

  // return cached ignore
  if (exportMap === null) return null;

  const stats = _fs2.default.statSync(path);
  if (exportMap != null) {
    // date equality check
    if (exportMap.mtime - stats.mtime === 0) {
      return exportMap;
    }
    // future: check content equality?
  }

  // check valid extensions first
  if (!(0, _ignore.hasValidExtension)(path, context)) {
    exportCache.set(cacheKey, null);
    return null;
  }

  const content = _fs2.default.readFileSync(path, { encoding: 'utf8' });

  // check for and cache ignore
  if ((0, _ignore2.default)(path, context) || !unambiguous.test(content)) {
    log('ignored path due to unambiguous regex or ignore settings:', path);
    exportCache.set(cacheKey, null);
    return null;
  }

  log('cache miss', cacheKey, 'for path', path);
  exportMap = ExportMap.parse(path, content, context);

  // ambiguous modules return null
  if (exportMap == null) return null;

  exportMap.mtime = stats.mtime;

  exportCache.set(cacheKey, exportMap);
  return exportMap;
};

ExportMap.parse = function (path, content, context) {
  var m = new ExportMap(path);

  try {
    var ast = (0, _parse2.default)(path, content, context);
  } catch (err) {
    log('parse error:', path, err);
    m.errors.push(err);
    return m; // can't continue
  }

  if (!unambiguous.isModule(ast)) return null;

  const docstyle = context.settings && context.settings['import/docstyle'] || ['jsdoc'];
  const docStyleParsers = {};
  docstyle.forEach(style => {
    docStyleParsers[style] = availableDocStyleParsers[style];
  });

  // attempt to collect module doc
  if (ast.comments) {
    ast.comments.some(c => {
      if (c.type !== 'Block') return false;
      try {
        const doc = _doctrine2.default.parse(c.value, { unwrap: true });
        if (doc.tags.some(t => t.title === 'module')) {
          m.doc = doc;
          return true;
        }
      } catch (err) {/* ignore */}
      return false;
    });
  }

  const namespaces = new Map();

  function remotePath(value) {
    return _resolve2.default.relative(value, path, context.settings);
  }

  function resolveImport(value) {
    const rp = remotePath(value);
    if (rp == null) return null;
    return ExportMap.for(childContext(rp, context));
  }

  function getNamespace(identifier) {
    if (!namespaces.has(identifier.name)) return;

    return function () {
      return resolveImport(namespaces.get(identifier.name));
    };
  }

  function addNamespace(object, identifier) {
    const nsfn = getNamespace(identifier);
    if (nsfn) {
      Object.defineProperty(object, 'namespace', { get: nsfn });
    }

    return object;
  }

  function captureDependency(declaration) {
    if (declaration.source == null) return null;

    const p = remotePath(declaration.source.value);
    if (p == null) return null;
    const existing = m.imports.get(p);
    if (existing != null) return existing.getter;

    const getter = thunkFor(p, context);
    m.imports.set(p, {
      getter,
      source: { // capturing actual node reference holds full AST in memory!
        value: declaration.source.value,
        loc: declaration.source.loc
      }
    });
    return getter;
  }

  const source = makeSourceCode(content, ast);

  ast.body.forEach(function (n) {

    if (n.type === 'ExportDefaultDeclaration') {
      const exportMeta = captureDoc(source, docStyleParsers, n);
      if (n.declaration.type === 'Identifier') {
        addNamespace(exportMeta, n.declaration);
      }
      m.namespace.set('default', exportMeta);
      return;
    }

    if (n.type === 'ExportAllDeclaration') {
      const getter = captureDependency(n);
      if (getter) m.dependencies.add(getter);
      return;
    }

    // capture namespaces in case of later export
    if (n.type === 'ImportDeclaration') {
      captureDependency(n);
      let ns;
      if (n.specifiers.some(s => s.type === 'ImportNamespaceSpecifier' && (ns = s))) {
        namespaces.set(ns.local.name, n.source.value);
      }
      return;
    }

    if (n.type === 'ExportNamedDeclaration') {
      // capture declaration
      if (n.declaration != null) {
        switch (n.declaration.type) {
          case 'FunctionDeclaration':
          case 'ClassDeclaration':
          case 'TypeAlias': // flowtype with babel-eslint parser
          case 'InterfaceDeclaration':
          case 'TSEnumDeclaration':
          case 'TSInterfaceDeclaration':
          case 'TSAbstractClassDeclaration':
          case 'TSModuleDeclaration':
            m.namespace.set(n.declaration.id.name, captureDoc(source, docStyleParsers, n));
            break;
          case 'VariableDeclaration':
            n.declaration.declarations.forEach(d => recursivePatternCapture(d.id, id => m.namespace.set(id.name, captureDoc(source, docStyleParsers, d, n))));
            break;
        }
      }

      const nsource = n.source && n.source.value;
      n.specifiers.forEach(s => {
        const exportMeta = {};
        let local;

        switch (s.type) {
          case 'ExportDefaultSpecifier':
            if (!n.source) return;
            local = 'default';
            break;
          case 'ExportNamespaceSpecifier':
            m.namespace.set(s.exported.name, Object.defineProperty(exportMeta, 'namespace', {
              get() {
                return resolveImport(nsource);
              }
            }));
            return;
          case 'ExportSpecifier':
            if (!n.source) {
              m.namespace.set(s.exported.name, addNamespace(exportMeta, s.local));
              return;
            }
          // else falls through
          default:
            local = s.local.name;
            break;
        }

        // todo: JSDoc
        m.reexports.set(s.exported.name, { local, getImport: () => resolveImport(nsource) });
      });
    }
  });

  return m;
};

/**
 * The creation of this closure is isolated from other scopes
 * to avoid over-retention of unrelated variables, which has
 * caused memory leaks. See #1266.
 */
function thunkFor(p, context) {
  return () => ExportMap.for(childContext(p, context));
}

/**
 * Traverse a pattern/identifier node, calling 'callback'
 * for each leaf identifier.
 * @param  {node}   pattern
 * @param  {Function} callback
 * @return {void}
 */
function recursivePatternCapture(pattern, callback) {
  switch (pattern.type) {
    case 'Identifier':
      // base case
      callback(pattern);
      break;

    case 'ObjectPattern':
      pattern.properties.forEach(p => {
        recursivePatternCapture(p.value, callback);
      });
      break;

    case 'ArrayPattern':
      pattern.elements.forEach(element => {
        if (element == null) return;
        recursivePatternCapture(element, callback);
      });
      break;

    case 'AssignmentPattern':
      callback(pattern.left);
      break;
  }
}

/**
 * don't hold full context object in memory, just grab what we need.
 */
function childContext(path, context) {
  const settings = context.settings,
        parserOptions = context.parserOptions,
        parserPath = context.parserPath;

  return {
    settings,
    parserOptions,
    parserPath,
    path
  };
}

/**
 * sometimes legacy support isn't _that_ hard... right?
 */
function makeSourceCode(text, ast) {
  if (_sourceCode2.default.length > 1) {
    // ESLint 3
    return new _sourceCode2.default(text, ast);
  } else {
    // ESLint 4, 5
    return new _sourceCode2.default({ text, ast });
  }
}
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fs from 'fs'\n\nimport doctrine from 'doctrine'\n\nimport debug from 'debug'\n\nimport SourceCode from 'eslint/lib/util/source-code'\n\nimport parse from 'eslint-module-utils/parse'\nimport resolve from 'eslint-module-utils/resolve'\nimport isIgnored, { hasValidExtension } from 'eslint-module-utils/ignore'\n\nimport { hashObject } from 'eslint-module-utils/hash'\nimport * as unambiguous from 'eslint-module-utils/unambiguous'\n\nconst log = debug('eslint-plugin-import:ExportMap')\n\nconst exportCache = new Map()\n\nexport default class ExportMap {\n  constructor(path) {\n    this.path = path\n    this.namespace = new Map()\n    // todo: restructure to key on path, value is resolver + map of names\n    this.reexports = new Map()\n    /**\n     * star-exports\n     * @type {Set} of () => ExportMap\n     */\n    this.dependencies = new Set()\n    /**\n     * dependencies of this module that are not explicitly re-exported\n     * @type {Map} from path = () => ExportMap\n     */\n    this.imports = new Map()\n    this.errors = []\n  }\n\n  get hasDefault() { return this.get('default') != null } // stronger than this.has\n\n  get size() {\n    let size = this.namespace.size + this.reexports.size\n    this.dependencies.forEach(dep => {\n      const d = dep()\n      // CJS / ignored dependencies won't exist (#717)\n      if (d == null) return\n      size += d.size\n    })\n    return size\n  }\n\n  /**\n   * Note that this does not check explicitly re-exported names for existence\n   * in the base namespace, but it will expand all `export * from '...'` exports\n   * if not found in the explicit namespace.\n   * @param  {string}  name\n   * @return {Boolean} true if `name` is exported by this module.\n   */\n  has(name) {\n    if (this.namespace.has(name)) return true\n    if (this.reexports.has(name)) return true\n\n    // default exports must be explicitly re-exported (#328)\n    if (name !== 'default') {\n      for (let dep of this.dependencies) {\n        let innerMap = dep()\n\n        // todo: report as unresolved?\n        if (!innerMap) continue\n\n        if (innerMap.has(name)) return true\n      }\n    }\n\n    return false\n  }\n\n  /**\n   * ensure that imported name fully resolves.\n   * @param  {[type]}  name [description]\n   * @return {Boolean}      [description]\n   */\n  hasDeep(name) {\n    if (this.namespace.has(name)) return { found: true, path: [this] }\n\n    if (this.reexports.has(name)) {\n      const reexports = this.reexports.get(name)\n          , imported = reexports.getImport()\n\n      // if import is ignored, return explicit 'null'\n      if (imported == null) return { found: true, path: [this] }\n\n      // safeguard against cycles, only if name matches\n      if (imported.path === this.path && reexports.local === name) {\n        return { found: false, path: [this] }\n      }\n\n      const deep = imported.hasDeep(reexports.local)\n      deep.path.unshift(this)\n\n      return deep\n    }\n\n\n    // default exports must be explicitly re-exported (#328)\n    if (name !== 'default') {\n      for (let dep of this.dependencies) {\n        let innerMap = dep()\n        // todo: report as unresolved?\n        if (!innerMap) continue\n\n        // safeguard against cycles\n        if (innerMap.path === this.path) continue\n\n        let innerValue = innerMap.hasDeep(name)\n        if (innerValue.found) {\n          innerValue.path.unshift(this)\n          return innerValue\n        }\n      }\n    }\n\n    return { found: false, path: [this] }\n  }\n\n  get(name) {\n    if (this.namespace.has(name)) return this.namespace.get(name)\n\n    if (this.reexports.has(name)) {\n      const reexports = this.reexports.get(name)\n          , imported = reexports.getImport()\n\n      // if import is ignored, return explicit 'null'\n      if (imported == null) return null\n\n      // safeguard against cycles, only if name matches\n      if (imported.path === this.path && reexports.local === name) return undefined\n\n      return imported.get(reexports.local)\n    }\n\n    // default exports must be explicitly re-exported (#328)\n    if (name !== 'default') {\n      for (let dep of this.dependencies) {\n        let innerMap = dep()\n        // todo: report as unresolved?\n        if (!innerMap) continue\n\n        // safeguard against cycles\n        if (innerMap.path === this.path) continue\n\n        let innerValue = innerMap.get(name)\n        if (innerValue !== undefined) return innerValue\n      }\n    }\n\n    return undefined\n  }\n\n  forEach(callback, thisArg) {\n    this.namespace.forEach((v, n) =>\n      callback.call(thisArg, v, n, this))\n\n    this.reexports.forEach((reexports, name) => {\n      const reexported = reexports.getImport()\n      // can't look up meta for ignored re-exports (#348)\n      callback.call(thisArg, reexported && reexported.get(reexports.local), name, this)\n    })\n\n    this.dependencies.forEach(dep => {\n      const d = dep()\n      // CJS / ignored dependencies won't exist (#717)\n      if (d == null) return\n\n      d.forEach((v, n) =>\n        n !== 'default' && callback.call(thisArg, v, n, this))\n    })\n  }\n\n  // todo: keys, values, entries?\n\n  reportErrors(context, declaration) {\n    context.report({\n      node: declaration.source,\n      message: `Parse errors in imported module '${declaration.source.value}': ` +\n                  `${this.errors\n                        .map(e => `${e.message} (${e.lineNumber}:${e.column})`)\n                        .join(', ')}`,\n    })\n  }\n}\n\n/**\n * parse docs from the first node that has leading comments\n */\nfunction captureDoc(source, docStyleParsers, ...nodes) {\n  const metadata = {}\n\n  // 'some' short-circuits on first 'true'\n  nodes.some(n => {\n    try {\n\n      let leadingComments\n\n      // n.leadingComments is legacy `attachComments` behavior\n      if ('leadingComments' in n) {\n        leadingComments = n.leadingComments\n      } else if (n.range) {\n        leadingComments = source.getCommentsBefore(n)\n      }\n\n      if (!leadingComments || leadingComments.length === 0) return false\n\n      for (let name in docStyleParsers) {\n        const doc = docStyleParsers[name](leadingComments)\n        if (doc) {\n          metadata.doc = doc\n        }\n      }\n\n      return true\n    } catch (err) {\n      return false\n    }\n  })\n\n  return metadata\n}\n\nconst availableDocStyleParsers = {\n  jsdoc: captureJsDoc,\n  tomdoc: captureTomDoc,\n}\n\n/**\n * parse JSDoc from leading comments\n * @param  {...[type]} comments [description]\n * @return {{doc: object}}\n */\nfunction captureJsDoc(comments) {\n  let doc\n\n  // capture XSDoc\n  comments.forEach(comment => {\n    // skip non-block comments\n    if (comment.value.slice(0, 4) !== '*\\n *') return\n    try {\n      doc = doctrine.parse(comment.value, { unwrap: true })\n    } catch (err) {\n      /* don't care, for now? maybe add to `errors?` */\n    }\n  })\n\n  return doc\n}\n\n/**\n  * parse TomDoc section from comments\n  */\nfunction captureTomDoc(comments) {\n  // collect lines up to first paragraph break\n  const lines = []\n  for (let i = 0; i < comments.length; i++) {\n    const comment = comments[i]\n    if (comment.value.match(/^\\s*$/)) break\n    lines.push(comment.value.trim())\n  }\n\n  // return doctrine-like object\n  const statusMatch = lines.join(' ').match(/^(Public|Internal|Deprecated):\\s*(.+)/)\n  if (statusMatch) {\n    return {\n      description: statusMatch[2],\n      tags: [{\n        title: statusMatch[1].toLowerCase(),\n        description: statusMatch[2],\n      }],\n    }\n  }\n}\n\nExportMap.get = function (source, context) {\n  const path = resolve(source, context)\n  if (path == null) return null\n\n  return ExportMap.for(childContext(path, context))\n}\n\nExportMap.for = function (context) {\n  const { path } = context\n\n  const cacheKey = hashObject(context).digest('hex')\n  let exportMap = exportCache.get(cacheKey)\n\n  // return cached ignore\n  if (exportMap === null) return null\n\n  const stats = fs.statSync(path)\n  if (exportMap != null) {\n    // date equality check\n    if (exportMap.mtime - stats.mtime === 0) {\n      return exportMap\n    }\n    // future: check content equality?\n  }\n\n  // check valid extensions first\n  if (!hasValidExtension(path, context)) {\n    exportCache.set(cacheKey, null)\n    return null\n  }\n\n  const content = fs.readFileSync(path, { encoding: 'utf8' })\n\n  // check for and cache ignore\n  if (isIgnored(path, context) || !unambiguous.test(content)) {\n    log('ignored path due to unambiguous regex or ignore settings:', path)\n    exportCache.set(cacheKey, null)\n    return null\n  }\n\n  log('cache miss', cacheKey, 'for path', path)\n  exportMap = ExportMap.parse(path, content, context)\n\n  // ambiguous modules return null\n  if (exportMap == null) return null\n\n  exportMap.mtime = stats.mtime\n\n  exportCache.set(cacheKey, exportMap)\n  return exportMap\n}\n\n\nExportMap.parse = function (path, content, context) {\n  var m = new ExportMap(path)\n\n  try {\n    var ast = parse(path, content, context)\n  } catch (err) {\n    log('parse error:', path, err)\n    m.errors.push(err)\n    return m // can't continue\n  }\n\n  if (!unambiguous.isModule(ast)) return null\n\n  const docstyle = (context.settings && context.settings['import/docstyle']) || ['jsdoc']\n  const docStyleParsers = {}\n  docstyle.forEach(style => {\n    docStyleParsers[style] = availableDocStyleParsers[style]\n  })\n\n  // attempt to collect module doc\n  if (ast.comments) {\n    ast.comments.some(c => {\n      if (c.type !== 'Block') return false\n      try {\n        const doc = doctrine.parse(c.value, { unwrap: true })\n        if (doc.tags.some(t => t.title === 'module')) {\n          m.doc = doc\n          return true\n        }\n      } catch (err) { /* ignore */ }\n      return false\n    })\n  }\n\n  const namespaces = new Map()\n\n  function remotePath(value) {\n    return resolve.relative(value, path, context.settings)\n  }\n\n  function resolveImport(value) {\n    const rp = remotePath(value)\n    if (rp == null) return null\n    return ExportMap.for(childContext(rp, context))\n  }\n\n  function getNamespace(identifier) {\n    if (!namespaces.has(identifier.name)) return\n\n    return function () {\n      return resolveImport(namespaces.get(identifier.name))\n    }\n  }\n\n  function addNamespace(object, identifier) {\n    const nsfn = getNamespace(identifier)\n    if (nsfn) {\n      Object.defineProperty(object, 'namespace', { get: nsfn })\n    }\n\n    return object\n  }\n\n  function captureDependency(declaration) {\n    if (declaration.source == null) return null\n\n    const p = remotePath(declaration.source.value)\n    if (p == null) return null\n    const existing = m.imports.get(p)\n    if (existing != null) return existing.getter\n\n    const getter = thunkFor(p, context)\n    m.imports.set(p, {\n      getter,\n      source: {  // capturing actual node reference holds full AST in memory!\n        value: declaration.source.value,\n        loc: declaration.source.loc,\n      },\n    })\n    return getter\n  }\n\n  const source = makeSourceCode(content, ast)\n\n  ast.body.forEach(function (n) {\n\n    if (n.type === 'ExportDefaultDeclaration') {\n      const exportMeta = captureDoc(source, docStyleParsers, n)\n      if (n.declaration.type === 'Identifier') {\n        addNamespace(exportMeta, n.declaration)\n      }\n      m.namespace.set('default', exportMeta)\n      return\n    }\n\n    if (n.type === 'ExportAllDeclaration') {\n      const getter = captureDependency(n)\n      if (getter) m.dependencies.add(getter)\n      return\n    }\n\n    // capture namespaces in case of later export\n    if (n.type === 'ImportDeclaration') {\n      captureDependency(n)\n      let ns\n      if (n.specifiers.some(s => s.type === 'ImportNamespaceSpecifier' && (ns = s))) {\n        namespaces.set(ns.local.name, n.source.value)\n      }\n      return\n    }\n\n    if (n.type === 'ExportNamedDeclaration') {\n      // capture declaration\n      if (n.declaration != null) {\n        switch (n.declaration.type) {\n          case 'FunctionDeclaration':\n          case 'ClassDeclaration':\n          case 'TypeAlias': // flowtype with babel-eslint parser\n          case 'InterfaceDeclaration':\n          case 'TSEnumDeclaration':\n          case 'TSInterfaceDeclaration':\n          case 'TSAbstractClassDeclaration':\n          case 'TSModuleDeclaration':\n            m.namespace.set(n.declaration.id.name, captureDoc(source, docStyleParsers, n))\n            break\n          case 'VariableDeclaration':\n            n.declaration.declarations.forEach((d) =>\n              recursivePatternCapture(d.id,\n                id => m.namespace.set(id.name, captureDoc(source, docStyleParsers, d, n))))\n            break\n        }\n      }\n\n      const nsource = n.source && n.source.value\n      n.specifiers.forEach((s) => {\n        const exportMeta = {}\n        let local\n\n        switch (s.type) {\n          case 'ExportDefaultSpecifier':\n            if (!n.source) return\n            local = 'default'\n            break\n          case 'ExportNamespaceSpecifier':\n            m.namespace.set(s.exported.name, Object.defineProperty(exportMeta, 'namespace', {\n              get() { return resolveImport(nsource) },\n            }))\n            return\n          case 'ExportSpecifier':\n            if (!n.source) {\n              m.namespace.set(s.exported.name, addNamespace(exportMeta, s.local))\n              return\n            }\n            // else falls through\n          default:\n            local = s.local.name\n            break\n        }\n\n        // todo: JSDoc\n        m.reexports.set(s.exported.name, { local, getImport: () => resolveImport(nsource) })\n      })\n    }\n  })\n\n  return m\n}\n\n/**\n * The creation of this closure is isolated from other scopes\n * to avoid over-retention of unrelated variables, which has\n * caused memory leaks. See #1266.\n */\nfunction thunkFor(p, context) {\n  return () => ExportMap.for(childContext(p, context))\n}\n\n\n/**\n * Traverse a pattern/identifier node, calling 'callback'\n * for each leaf identifier.\n * @param  {node}   pattern\n * @param  {Function} callback\n * @return {void}\n */\nexport function recursivePatternCapture(pattern, callback) {\n  switch (pattern.type) {\n    case 'Identifier': // base case\n      callback(pattern)\n      break\n\n    case 'ObjectPattern':\n      pattern.properties.forEach(p => {\n        recursivePatternCapture(p.value, callback)\n      })\n      break\n\n    case 'ArrayPattern':\n      pattern.elements.forEach((element) => {\n        if (element == null) return\n        recursivePatternCapture(element, callback)\n      })\n      break\n\n    case 'AssignmentPattern':\n      callback(pattern.left)\n      break\n  }\n}\n\n/**\n * don't hold full context object in memory, just grab what we need.\n */\nfunction childContext(path, context) {\n  const { settings, parserOptions, parserPath } = context\n  return {\n    settings,\n    parserOptions,\n    parserPath,\n    path,\n  }\n}\n\n\n/**\n * sometimes legacy support isn't _that_ hard... right?\n */\nfunction makeSourceCode(text, ast) {\n  if (SourceCode.length > 1) {\n    // ESLint 3\n    return new SourceCode(text, ast)\n  } else {\n    // ESLint 4, 5\n    return new SourceCode({ text, ast })\n  }\n}\n"]}