Acme.BookStore.HttpApi.Host/node_modules/spdx-expression-parse/scan.js

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'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-.]+/)
  }