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

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'use strict'

// The ABNF grammar in the spec is totally ambiguous.
//
// This parser follows the operator precedence defined in the
// `Order of Precedence and Parentheses` section.

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

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

  function token () {
    return hasMore() ? tokens[index] : null
  }

  function next () {
    if (!hasMore()) {
      throw new Error()
    }
    index++
  }

  function parseOperator (operator) {
    var t = token()
    if (t && t.type === 'OPERATOR' && operator === t.string) {
      next()
      return t.string
    }
  }

  function parseWith () {
    if (parseOperator('WITH')) {
      var t = token()
      if (t && t.type === 'EXCEPTION') {
        next()
        return t.string
      }
      throw new Error('Expected exception after `WITH`')
    }
  }

  function parseLicenseRef () {
    // TODO: Actually, everything is concatenated into one string
    // for backward-compatibility but it could be better to return
    // a nice structure.
    var begin = index
    var string = ''
    var t = token()
    if (t.type === 'DOCUMENTREF') {
      next()
      string += 'DocumentRef-' + t.string + ':'
      if (!parseOperator(':')) {
        throw new Error('Expected `:` after `DocumentRef-...`')
      }
    }
    t = token()
    if (t.type === 'LICENSEREF') {