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+/*
+Copyright spdx-correct.js contributors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+var parse = require('spdx-expression-parse')
+var spdxLicenseIds = require('spdx-license-ids')
+
+function valid (string) {
+  try {
+    parse(string)
+    return true
+  } catch (error) {
+    return false
+  }
+}
+
+// Sorting function that orders the given array of transpositions such
+// that a transposition with the longer pattern comes before a transposition
+// with a shorter pattern. This is to prevent e.g. the transposition
+// ["General Public License", "GPL"] from matching to "Lesser General Public License"
+// before a longer and more accurate transposition ["Lesser General Public License", "LGPL"]
+// has a chance to be recognized.
+function sortTranspositions(a, b) {
+  var length = b[0].length - a[0].length
+  if (length !== 0) return length
+  return a[0].toUpperCase().localeCompare(b[0].toUpperCase())
+}
+
+// Common transpositions of license identifier acronyms
+var transpositions = [
+  ['APGL', 'AGPL'],
+  ['Gpl', 'GPL'],
+  ['GLP', 'GPL'],
+  ['APL', 'Apache'],
+  ['ISD', 'ISC'],
+  ['GLP', 'GPL'],
+  ['IST', 'ISC'],
+  ['Claude', 'Clause'],
+  [' or later', '+'],
+  [' International', ''],
+  ['GNU', 'GPL'],
+  ['GUN', 'GPL'],
+  ['+', ''],
+  ['GNU GPL', 'GPL'],
+  ['GNU LGPL', 'LGPL'],
+  ['GNU/GPL', 'GPL'],
+  ['GNU GLP', 'GPL'],
+  ['GNU LESSER GENERAL PUBLIC LICENSE', 'LGPL'],
+  ['GNU Lesser General Public License', 'LGPL'],
+  ['GNU LESSER GENERAL PUBLIC LICENSE', 'LGPL-2.1'],
+  ['GNU Lesser General Public License', 'LGPL-2.1'],
+  ['LESSER GENERAL PUBLIC LICENSE', 'LGPL'],
+  ['Lesser General Public License', 'LGPL'],
+  ['LESSER GENERAL PUBLIC LICENSE', 'LGPL-2.1'],
+  ['Lesser General Public License', 'LGPL-2.1'],
+  ['GNU General Public License', 'GPL'],
+  ['Gnu public license', 'GPL'],
+  ['GNU Public License', 'GPL'],
+  ['GNU GENERAL PUBLIC LICENSE', 'GPL'],
+  ['MTI', 'MIT'],
+  ['Mozilla Public License', 'MPL'],
+  ['Universal Permissive License', 'UPL'],
+  ['WTH', 'WTF'],
+  ['WTFGPL', 'WTFPL'],
+  ['-License', '']
+].sort(sortTranspositions)
+
+var TRANSPOSED = 0
+var CORRECT = 1
+
+// Simple corrections to nearly valid identifiers.
+var transforms = [
+  // e.g. 'mit'
+  function (argument) {
+    return argument.toUpperCase()
+  },
+  // e.g. 'MIT '
+  function (argument) {
+    return argument.trim()
+  },
+  // e.g. 'M.I.T.'
+  function (argument) {
+    return argument.replace(/\./g, '')
+  },
+  // e.g. 'Apache- 2.0'
+  function (argument) {
+    return argument.replace(/\s+/g, '')
+  },
+  // e.g. 'CC BY 4.0''
+  function (argument) {
+    return argument.replace(/\s+/g, '-')
+  },
+  // e.g. 'LGPLv2.1'
+  function (argument) {
+    return argument.replace('v', '-')
+  },
+  // e.g. 'Apache 2.0'
+  function (argument) {
+    return argument.replace(/,?\s*(\d)/, '-$1')
+  },
+  // e.g. 'GPL 2'
+  function (argument) {
+    return argument.replace(/,?\s*(\d)/, '-$1.0')
+  },
+  // e.g. 'Apache Version 2.0'
+  function (argument) {
+    return argument
+      .replace(/,?\s*(V\.|v\.|V|v|Version|version)\s*(\d)/, '-$2')
+  },
+  // e.g. 'Apache Version 2'
+  function (argument) {
+    return argument
+      .replace(/,?\s*(V\.|v\.|V|v|Version|version)\s*(\d)/, '-$2.0')
+  },
+  // e.g. 'ZLIB'
+  function (argument) {
+    return argument[0].toUpperCase() + argument.slice(1)
+  },
+  // e.g. 'MPL/2.0'
+  function (argument) {
+    return argument.replace('/', '-')
+  },
+  // e.g. 'Apache 2'
+  function (argument) {
+    return argument
+      .replace(/\s*V\s*(\d)/, '-$1')
+      .replace(/(\d)$/, '$1.0')
+  },
+  // e.g. 'GPL-2.0', 'GPL-3.0'
+  function (argument) {
+    if (argument.indexOf('3.0') !== -1) {
+      return argument + '-or-later'
+    } else {
+      return argument + '-only'
+    }
+  },
+  // e.g. 'GPL-2.0-'
+  function (argument) {
+    return argument + 'only'
+  },
+  // e.g. 'GPL2'
+  function (argument) {
+    return argument.replace(/(\d)$/, '-$1.0')
+  },
+  // e.g. 'BSD 3'
+  function (argument) {
+    return argument.replace(/(-| )?(\d)$/, '-$2-Clause')
+  },
+  // e.g. 'BSD clause 3'
+  function (argument) {
+    return argument.replace(/(-| )clause(-| )(\d)/, '-$3-Clause')
+  },
+  // e.g. 'New BSD license'
+  function (argument) {
+    return argument.replace(/\b(Modified|New|Revised)(-| )?BSD((-| )License)?/i, 'BSD-3-Clause')
+  },
+  // e.g. 'Simplified BSD license'
+  function (argument) {
+    return argument.replace(/\bSimplified(-| )?BSD((-| )License)?/i, 'BSD-2-Clause')
+  },
+  // e.g. 'Free BSD license'
+  function (argument) {
+    return argument.replace(/\b(Free|Net)(-| )?BSD((-| )License)?/i, 'BSD-2-Clause-$1BSD')
+  },
+  // e.g. 'Clear BSD license'
+  function (argument) {
+    return argument.replace(/\bClear(-| )?BSD((-| )License)?/i, 'BSD-3-Clause-Clear')
+  },
+  // e.g. 'Old BSD License'
+  function (argument) {
+    return argument.replace(/\b(Old|Original)(-| )?BSD((-| )License)?/i, 'BSD-4-Clause')
+  },
+  // e.g. 'BY-NC-4.0'
+  function (argument) {
+    return 'CC-' + argument
+  },
+  // e.g. 'BY-NC'
+  function (argument) {
+    return 'CC-' + argument + '-4.0'
+  },
+  // e.g. 'Attribution-NonCommercial'
+  function (argument) {
+    return argument
+      .replace('Attribution', 'BY')
+      .replace('NonCommercial', 'NC')
+      .replace('NoDerivatives', 'ND')
+      .replace(/ (\d)/, '-$1')
+      .replace(/ ?International/, '')
+  },
+  // e.g. 'Attribution-NonCommercial'
+  function (argument) {
+    return 'CC-' +
+      argument
+        .replace('Attribution', 'BY')
+        .replace('NonCommercial', 'NC')
+        .replace('NoDerivatives', 'ND')
+        .replace(/ (\d)/, '-$1')
+        .replace(/ ?International/, '') +
+      '-4.0'
+  }
+]
+
+var licensesWithVersions = spdxLicenseIds
+  .map(function (id) {
+    var match = /^(.*)-\d+\.\d+$/.exec(id)
+    return match
+      ? [match[0], match[1]]
+      : [id, null]
+  })
+  .reduce(function (objectMap, item) {
+    var key = item[1]
+    objectMap[key] = objectMap[key] || []
+    objectMap[key].push(item[0])
+    return objectMap
+  }, {})
+
+var licensesWithOneVersion = Object.keys(licensesWithVersions)
+  .map(function makeEntries (key) {
+    return [key, licensesWithVersions[key]]
+  })
+  .filter(function identifySoleVersions (item) {
+    return (
+      // Licenses has just one valid version suffix.
+      item[1].length === 1 &&
+      item[0] !== null &&
+      // APL will be considered Apache, rather than APL-1.0
+      item[0] !== 'APL'
+    )
+  })
+  .map(function createLastResorts (item) {
+    return [item[0], item[1][0]]
+  })
+
+licensesWithVersions = undefined
+
+// If all else fails, guess that strings containing certain substrings
+// meant to identify certain licenses.
+var lastResorts = [
+  ['UNLI', 'Unlicense'],
+  ['WTF', 'WTFPL'],
+  ['2 CLAUSE', 'BSD-2-Clause'],
+  ['2-CLAUSE', 'BSD-2-Clause'],
+  ['3 CLAUSE', 'BSD-3-Clause'],
+  ['3-CLAUSE', 'BSD-3-Clause'],
+  ['AFFERO', 'AGPL-3.0-or-later'],
+  ['AGPL', 'AGPL-3.0-or-later'],
+  ['APACHE', 'Apache-2.0'],
+  ['ARTISTIC', 'Artistic-2.0'],
+  ['Affero', 'AGPL-3.0-or-later'],
+  ['BEER', 'Beerware'],
+  ['BOOST', 'BSL-1.0'],
+  ['BSD', 'BSD-2-Clause'],
+  ['CDDL', 'CDDL-1.1'],
+  ['ECLIPSE', 'EPL-1.0'],
+  ['FUCK', 'WTFPL'],
+  ['GNU', 'GPL-3.0-or-later'],
+  ['LGPL', 'LGPL-3.0-or-later'],
+  ['GPLV1', 'GPL-1.0-only'],
+  ['GPL-1', 'GPL-1.0-only'],
+  ['GPLV2', 'GPL-2.0-only'],
+  ['GPL-2', 'GPL-2.0-only'],
+  ['GPL', 'GPL-3.0-or-later'],
+  ['MIT +NO-FALSE-ATTRIBS', 'MITNFA'],
+  ['MIT', 'MIT'],
+  ['MPL', 'MPL-2.0'],
+  ['X11', 'X11'],
+  ['ZLIB', 'Zlib']
+].concat(licensesWithOneVersion).sort(sortTranspositions)
+
+var SUBSTRING = 0
+var IDENTIFIER = 1
+
+var validTransformation = function (identifier) {
+  for (var i = 0; i < transforms.length; i++) {
+    var transformed = transforms[i](identifier).trim()
+    if (transformed !== identifier && valid(transformed)) {
+      return transformed
+    }
+  }
+  return null
+}
+
+var validLastResort = function (identifier) {
+  var upperCased = identifier.toUpperCase()
+  for (var i = 0; i < lastResorts.length; i++) {
+    var lastResort = lastResorts[i]
+    if (upperCased.indexOf(lastResort[SUBSTRING]) > -1) {
+      return lastResort[IDENTIFIER]
+    }
+  }
+  return null
+}
+
+var anyCorrection = function (identifier, check) {
+  for (var i = 0; i < transpositions.length; i++) {
+    var transposition = transpositions[i]
+    var transposed = transposition[TRANSPOSED]
+    if (identifier.indexOf(transposed) > -1) {
+      var corrected = identifier.replace(
+        transposed,
+        transposition[CORRECT]
+      )
+      var checked = check(corrected)
+      if (checked !== null) {
+        return checked
+      }
+    }
+  }
+  return null
+}
+
+module.exports = function (identifier, options) {
+  options = options || {}
+  var upgrade = options.upgrade === undefined ? true : !!options.upgrade
+  function postprocess (value) {
+    return upgrade ? upgradeGPLs(value) : value
+  }
+  var validArugment = (
+    typeof identifier === 'string' &&
+    identifier.trim().length !== 0
+  )
+  if (!validArugment) {
+    throw Error('Invalid argument. Expected non-empty string.')
+  }
+  identifier = identifier.trim()
+  if (valid(identifier)) {
+    return postprocess(identifier)
+  }
+  var noPlus = identifier.replace(/\+$/, '').trim()
+  if (valid(noPlus)) {
+    return postprocess(noPlus)
+  }
+  var transformed = validTransformation(identifier)
+  if (transformed !== null) {
+    return postprocess(transformed)
+  }
+  transformed = anyCorrection(identifier, function (argument) {
+    if (valid(argument)) {
+      return argument
+    }
+    return validTransformation(argument)
+  })
+  if (transformed !== null) {
+    return postprocess(transformed)
+  }
+  transformed = validLastResort(identifier)
+  if (transformed !== null) {
+    return postprocess(transformed)
+  }
+  transformed = anyCorrection(identifier, validLastResort)
+  if (transformed !== null) {
+    return postprocess(transformed)
+  }
+  return null
+}
+
+function upgradeGPLs (value) {
+  if ([
+    'GPL-1.0', 'LGPL-1.0', 'AGPL-1.0',
+    'GPL-2.0', 'LGPL-2.0', 'AGPL-2.0',
+    'LGPL-2.1'
+  ].indexOf(value) !== -1) {
+    return value + '-only'
+  } else if ([
+    'GPL-1.0+', 'GPL-2.0+', 'GPL-3.0+',
+    'LGPL-2.0+', 'LGPL-2.1+', 'LGPL-3.0+',
+    'AGPL-1.0+', 'AGPL-3.0+'
+  ].indexOf(value) !== -1) {
+    return value.replace(/\+$/, '-or-later')
+  } else if (['GPL-3.0', 'LGPL-3.0', 'AGPL-3.0'].indexOf(value) !== -1) {
+    return value + '-or-later'
+  } else {
+    return value
+  }
+}