'use strict';

function wordRegexp(words) {
  return new RegExp("^((" + words.join(")|(") + "))\\b", "i");
}
var keywordArray = [
  "package", "message", "import", "syntax",
  "required", "optional", "repeated", "reserved", "default", "extensions", "packed",
  "bool", "bytes", "double", "enum", "float", "string",
  "int32", "int64", "uint32", "uint64", "sint32", "sint64", "fixed32", "fixed64", "sfixed32", "sfixed64",
  "option", "service", "rpc", "returns"
];
var keywords = wordRegexp(keywordArray);

var identifiers = new RegExp("^[_A-Za-z\xa1-\uffff][_A-Za-z0-9\xa1-\uffff]*");

function tokenBase(stream) {
  // whitespaces
  if (stream.eatSpace()) return null;

  // Handle one line Comments
  if (stream.match("//")) {
    stream.skipToEnd();
    return "comment";
  }

  // Handle Number Literals
  if (stream.match(/^[0-9\.+-]/, false)) {
    if (stream.match(/^[+-]?0x[0-9a-fA-F]+/))
      return "number";
    if (stream.match(/^[+-]?\d*\.\d+([EeDd][+-]?\d+)?/))
      return "number";
    if (stream.match(/^[+-]?\d+([EeDd][+-]?\d+)?/))
      return "number";
  }

  // Handle Strings
  if (stream.match(/^"([^"]|(""))*"/)) { return "string"; }
  if (stream.match(/^'([^']|(''))*'/)) { return "string"; }

  // Handle words
  if (stream.match(keywords)) { return "keyword"; }
  if (stream.match(identifiers)) { return "variable"; }
  // Handle non-detected items
  stream.next();
  return null;
}
const protobuf = {
  token: tokenBase,
  languageData: {
    autocomplete: keywordArray
  }
};

exports.protobuf = protobuf;
