/*
 Language: Zephir
 Description: Zephir, an open source, high-level language designed to ease the creation and maintainability of extensions for PHP with a focus on type and memory safety.
 Author: Oleg Efimov <efimovov@gmail.com>
 Website: https://zephir-lang.com/en
 Audit: 2020
 */

/** @type LanguageFn */
export default function(hljs) {
  const STRING = {
    className: 'string',
    contains: [ hljs.BACKSLASH_ESCAPE ],
    variants: [
      hljs.inherit(hljs.APOS_STRING_MODE, { illegal: null }),
      hljs.inherit(hljs.QUOTE_STRING_MODE, { illegal: null })
    ]
  };
  const TITLE_MODE = hljs.UNDERSCORE_TITLE_MODE;
  const NUMBER = { variants: [
    hljs.BINARY_NUMBER_MODE,
    hljs.C_NUMBER_MODE
  ] };
  const KEYWORDS =
    // classes and objects
    'namespace class interface use extends '
    + 'function return '
    + 'abstract final public protected private static deprecated '
    // error handling
    + 'throw try catch Exception '
    // keyword-ish things their website does NOT seem to highlight (in their own snippets)
    // 'typeof fetch in ' +
    // operators/helpers
    + 'echo empty isset instanceof unset '
    // assignment/variables
    + 'let var new const self '
    // control
    + 'require '
    + 'if else elseif switch case default '
    + 'do while loop for continue break '
    + 'likely unlikely '
    // magic constants
    // https://github.com/phalcon/zephir/blob/master/Library/Expression/Constants.php
    + '__LINE__ __FILE__ __DIR__ __FUNCTION__ __CLASS__ __TRAIT__ __METHOD__ __NAMESPACE__ '
    // types - https://docs.zephir-lang.com/0.12/en/types
    + 'array boolean float double integer object resource string '
    + 'char long unsigned bool int uint ulong uchar '
    // built-ins
    + 'true false null undefined';

  return {
    name: 'Zephir',
    aliases: [ 'zep' ],
    keywords: KEYWORDS,
    contains: [
      hljs.C_LINE_COMMENT_MODE,
      hljs.COMMENT(
        /\/\*/,
        /\*\//,
        { contains: [
          {
            className: 'doctag',
            begin: /@[A-Za-z]+/
          }
        ] }
      ),
      {
        className: 'string',
        begin: /<<<['"]?\w+['"]?$/,
        end: /^\w+;/,
        contains: [ hljs.BACKSLASH_ESCAPE ]
      },
      {
        // swallow composed identifiers to avoid parsing them as keywords
        begin: /(::|->)+[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*/ },
      {
        className: 'function',
        beginKeywords: 'function fn',
        end: /[;{]/,
        excludeEnd: true,
        illegal: /\$|\[|%/,
        contains: [
          TITLE_MODE,
          {
            className: 'params',
            begin: /\(/,
            end: /\)/,
            keywords: KEYWORDS,
            contains: [
              'self',
              hljs.C_BLOCK_COMMENT_MODE,
              STRING,
              NUMBER
            ]
          }
        ]
      },
      {
        className: 'class',
        beginKeywords: 'class interface',
        end: /\{/,
        excludeEnd: true,
        illegal: /[:($"]/,
        contains: [
          { beginKeywords: 'extends implements' },
          TITLE_MODE
        ]
      },
      {
        beginKeywords: 'namespace',
        end: /;/,
        illegal: /[.']/,
        contains: [ TITLE_MODE ]
      },
      {
        beginKeywords: 'use',
        end: /;/,
        contains: [ TITLE_MODE ]
      },
      { begin: /=>/ // No markup, just a relevance booster
      },
      STRING,
      NUMBER
    ]
  };
}