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File Content: `scan.js`

'use strict'

var licenses = []
  .concat(require('spdx-license-ids'))
  .concat(require('spdx-license-ids/deprecated'))
var exceptions = require('spdx-exceptions')

module.exports = function (source) {
  var index = 0

  function hasMore () {
    return index < source.length
  }

  // `value` can be a regexp or a string.
  // If it is recognized, the matching source string is returned and
  // the index is incremented. Otherwise `undefined` is returned.
  function read (value) {
    if (value instanceof RegExp) {
      var chars = source.slice(index)
      var match = chars.match(value)
      if (match) {
        index += match[0].length
        return match[0]
      }
    } else {
      if (source.indexOf(value, index) === index) {
        index += value.length
        return value
      }
    }
  }

  function skipWhitespace () {
    read(/[ ]*/)
  }

  function operator () {
    var string
    var possibilities = ['WITH', 'AND', 'OR', '(', ')', ':', '+']
    for (var i = 0; i < possibilities.length; i++) {
      string = read(possibilities[i])
      if (string) {
        break
      }
    }

    if (string === '+' && index > 1 && source[index - 2] === ' ') {
      throw new Error('Space before `+`')
    }

    return string && {
      type: 'OPERATOR',
      string: string
    }
  }

  function idstring () {
    return read(/[A-Za-z0-9-.]+/)
  }

  function expectIdstring () {
    var string = idstring()
    if (!string) {
      throw new Error('Expected idstring at offset ' + index)
    }
    return string
  }

  function documentRef () {
    if (read('DocumentRef-')) {
      var string = expectIdstring()
      return {type: 'DOCUMENTREF', string: string}
    }
  }

  function licenseRef () {
    if (read('LicenseRef-')) {
      var string = expectIdstring()
      return {type: 'LICENSEREF', string: string}
    }
  }

  function identifier () {
    var begin = index
    var string = idstring()

    if (licenses.indexOf(string) !== -1) {
      return {
        type: 'LICENSE',
        string: string
      }
    } else if (exceptions.indexOf(string) !== -1) {
      return {
        type: 'EXCEPTION',
        string: string
      }
    }

    index = begin
  }

  // Tries to read the next token. Returns `undefined` if no token is
  // recognized.
  function parseToken () {
    // Ordering matters
    return (
      operator() ||
      documentRef() ||
      licenseRef() ||
      identifier()
    )
  }

  var tokens = []
  while (hasMore()) {
    skipWhitespace()
    if (!hasMore()) {
      break
    }

    var token = parseToken()
    if (!token) {
      throw new Error('Unexpected `' + source[index] +
                      '` at offset ' + index)
    }

    tokens.push(token)
  }
  return tokens
}
Name	Size	Permission
AUTHORS	203 bytes	0644
LICENSE	1111 bytes	0644
README.md	3826 bytes	0644
index.js	143 bytes	0644
package.json	2619 bytes	0644
parse.js	2897 bytes	0644
scan.js	2750 bytes	0644
File Content: scan.js

File Content: `scan.js`
