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node_modules/eslint-plugin-node/lib/util/get-package-json.js 2.32 KB
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  /**
   * @author Toru Nagashima
   * @copyright 2015 Toru Nagashima. All rights reserved.
   * See LICENSE file in root directory for full license.
   */
  "use strict"
  
  //------------------------------------------------------------------------------
  // Requirements
  //------------------------------------------------------------------------------
  
  const fs = require("fs")
  const path = require("path")
  const Cache = require("./cache")
  
  //------------------------------------------------------------------------------
  // Helpers
  //------------------------------------------------------------------------------
  
  const cache = new Cache()
  
  /**
   * Reads the `package.json` data in a given path.
   *
   * Don't cache the data.
   *
   * @param {string} dir - The path to a directory to read.
   * @returns {object|null} The read `package.json` data, or null.
   */
  function readPackageJson(dir) {
      const filePath = path.join(dir, "package.json")
      try {
          const text = fs.readFileSync(filePath, "utf8")
          const data = JSON.parse(text)
  
          if (typeof data === "object" && data !== null) {
              data.filePath = filePath
              return data
          }
      }
      catch (_err) {
          // do nothing.
      }
  
      return null
  }
  
  //------------------------------------------------------------------------------
  // Public Interface
  //------------------------------------------------------------------------------
  
  /**
   * Gets a `package.json` data.
   * The data is cached if found, then it's used after.
   *
   * @param {string} startPath - A file path to lookup.
   * @returns {object|null} A found `package.json` data or `null`.
   *      This object have additional property `filePath`.
   */
  module.exports = function getPackageJson(startPath) {
      const startDir = path.dirname(path.resolve(startPath))
      let dir = startDir
      let prevDir = ""
      let data = null
  
      do {
          data = cache.get(dir)
          if (data) {
              if (dir !== startDir) {
                  cache.set(startDir, data)
              }
              return data
          }
  
          data = readPackageJson(dir)
          if (data) {
              cache.set(dir, data)
              cache.set(startDir, data)
              return data
          }
  
          // Go to next.
          prevDir = dir
          dir = path.resolve(dir, "..")
      }
      while (dir !== prevDir)
  
      cache.set(startDir, null)
      return null
  }