/*
Language: Turtle
Author: Redmer KRONEMEIJER <redmer.kronemeijer@rdmr.eu>
Contributors: Mark ELLIS <mark.ellis@stardog.com>, Vladimir ALEXIEV <vladimir.alexiev@ontotext.com>
*/


function hljsDefineTurtle(hljs) {
  // export default function (hljs) {
  var KEYWORDS = {
    keyword: "BASE|2 PREFIX|5 @base|10 @prefix|10",
    literal: "true false",
    built_in: "a",
  };

  var IRI_LITERAL = {
    // https://www.w3.org/TR/turtle/#grammar-production-IRIREF
    className: "literal",
    relevance: 1, // XML tags look also like relative IRIs
    begin: /</,
    end: />/,
    // illegal: /[^\x00-\x20"{}|^`\\]/, // TODO: https://www.w3.org/TR/turtle/#grammar-production-UCHAR
  };

  // https://www.w3.org/TR/turtle/#terminals
  var PN_CHARS_BASE =
    "A-Za-z\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02FF\u0370-\u037D\u037F-\u1FFF\u200C-\u200D\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD\u10000-\uEFFFF";
  var PN_CHARS_U = PN_CHARS_BASE + "_";
  var PN_CHARS = "-" + PN_CHARS_U + "0-9\u00B7\u0300-\u036F\u203F-\u2040";
  var BLANK_NODE_LABEL =
    "_:[" + PN_CHARS_U + "0-9]([" + PN_CHARS + ".]*[" + PN_CHARS + "])?";
  var PN_PREFIX =
    "[" + PN_CHARS_BASE + "]([" + PN_CHARS + ".]*[" + PN_CHARS + "])?";
  var PERCENT = "%[0-9A-Fa-f][0-9A-Fa-f]";
  var PN_LOCAL_ESC = "\\\\[_~.!$&'()*+,;=/?#@%-]";
  var PLX = PERCENT + "|" + PN_LOCAL_ESC;
  var PNAME_NS = "(" + PN_PREFIX + ")?:";
  var PN_LOCAL =
    "([" +
    PN_CHARS_U +
    ":0-9]|" +
    PLX +
    ")([" +
    PN_CHARS +
    ".:]|" +
    PLX +
    ")*([" +
    PN_CHARS +
    ":]|" +
    PLX +
    ")?";
  var PNAME_LN = PNAME_NS + PN_LOCAL;
  var PNAME_NS_or_LN = PNAME_NS + "(" + PN_LOCAL + ")?";

  var PNAME = {
    begin: PNAME_NS_or_LN,
    relevance: 0,
    className: "symbol",
  };

  var BLANK_NODE = {
    begin: BLANK_NODE_LABEL,
    relevance: 10,
    className: "template-variable",
  };

  var LANGTAG = {
    begin: /@[a-zA-Z]+([a-zA-Z0-9-]+)*/,
    className: "type",
    relevance: 0, // also catches objectivec keywords like: @protocol, @optional
  };

  var DATATYPE = {
    begin: "\\^\\^" + PNAME_LN,
    className: "type",
    relevance: 10,
  };

  var TRIPLE_APOS_STRING = {
    begin: /'''/,
    end: /'''/,
    className: "string",
    relevance: 0,
  };

  var TRIPLE_QUOTE_STRING = {
    begin: /"""/,
    end: /"""/,
    className: "string",
    relevance: 0,
  };

  var APOS_STRING_LITERAL = JSON.parse(JSON.stringify(hljs.APOS_STRING_MODE));
  APOS_STRING_LITERAL.relevance = 0;

  var QUOTE_STRING_LITERAL = JSON.parse(JSON.stringify(hljs.QUOTE_STRING_MODE));
  QUOTE_STRING_LITERAL.relevance = 0;

  return {
    name: "Turtle",
    case_insensitive: true, // however `true` and `@prefix` are oblig. cased thus
    keywords: KEYWORDS,
    aliases: ["turtle", "ttl", "n3"],
    contains: [
      LANGTAG,
      DATATYPE,
      IRI_LITERAL,
      BLANK_NODE,
      PNAME,
      TRIPLE_APOS_STRING,
      TRIPLE_QUOTE_STRING, // order matters
      APOS_STRING_LITERAL,
      QUOTE_STRING_LITERAL,
      hljs.C_NUMBER_MODE,
      hljs.HASH_COMMENT_MODE,
    ],
    exports: {
      LANGTAG: LANGTAG,
      DATATYPE: DATATYPE,
      IRI_LITERAL: IRI_LITERAL,
      BLANK_NODE: BLANK_NODE,
      PNAME: PNAME,
      TRIPLE_APOS_STRING: TRIPLE_APOS_STRING,
      TRIPLE_QUOTE_STRING: TRIPLE_QUOTE_STRING,
      APOS_STRING_LITERAL: APOS_STRING_LITERAL,
      QUOTE_STRING_LITERAL: QUOTE_STRING_LITERAL,
      NUMBER: hljs.C_NUMBER_MODE,
      KEYWORDS: KEYWORDS,
    },
  };
}

// module.exports = function (hljs) {
//   hljs.registerLanguage("turtle", hljsDefineTurtle);
// };

// module.exports.definer = hljsDefineTurtle;

export const definer = hljsDefineTurtle;