/*
Language: Scheme
Description: Scheme is a programming language in the Lisp family.
             (keywords based on http://community.schemewiki.org/?scheme-keywords)
Author: JP Verkamp <me@jverkamp.com>
Contributors: Ivan Sagalaev <maniac@softwaremaniacs.org>
Origin: clojure.js
Website: http://community.schemewiki.org/?what-is-scheme
Category: lisp
*/

export default function(hljs) {
  var SCHEME_IDENT_RE = '[^\\(\\)\\[\\]\\{\\}",\'`;#|\\\\\\s]+';
  var SCHEME_SIMPLE_NUMBER_RE = '(-|\\+)?\\d+([./]\\d+)?';
  var SCHEME_COMPLEX_NUMBER_RE = SCHEME_SIMPLE_NUMBER_RE + '[+\\-]' + SCHEME_SIMPLE_NUMBER_RE + 'i';
  var KEYWORDS = {
    $pattern: SCHEME_IDENT_RE,
    'builtin-name':
      'case-lambda call/cc class define-class exit-handler field import ' +
      'inherit init-field interface let*-values let-values let/ec mixin ' +
      'opt-lambda override protect provide public rename require ' +
      'require-for-syntax syntax syntax-case syntax-error unit/sig unless ' +
      'when with-syntax and begin call-with-current-continuation ' +
      'call-with-input-file call-with-output-file case cond define ' +
      'define-syntax delay do dynamic-wind else for-each if lambda let let* ' +
      'let-syntax letrec letrec-syntax map or syntax-rules \' * + , ,@ - ... / ' +
      '; < <= = => > >= ` abs acos angle append apply asin assoc assq assv atan ' +
      'boolean? caar cadr call-with-input-file call-with-output-file ' +
      'call-with-values car cdddar cddddr cdr ceiling char->integer ' +
      'char-alphabetic? char-ci<=? char-ci<? char-ci=? char-ci>=? char-ci>? ' +
      'char-downcase char-lower-case? char-numeric? char-ready? char-upcase ' +
      'char-upper-case? char-whitespace? char<=? char<? char=? char>=? char>? ' +
      'char? close-input-port close-output-port complex? cons cos ' +
      'current-input-port current-output-port denominator display eof-object? ' +
      'eq? equal? eqv? eval even? exact->inexact exact? exp expt floor ' +
      'force gcd imag-part inexact->exact inexact? input-port? integer->char ' +
      'integer? interaction-environment lcm length list list->string ' +
      'list->vector list-ref list-tail list? load log magnitude make-polar ' +
      'make-rectangular make-string make-vector max member memq memv min ' +
      'modulo negative? newline not null-environment null? number->string ' +
      'number? numerator odd? open-input-file open-output-file output-port? ' +
      'pair? peek-char port? positive? procedure? quasiquote quote quotient ' +
      'rational? rationalize read read-char real-part real? remainder reverse ' +
      'round scheme-report-environment set! set-car! set-cdr! sin sqrt string ' +
      'string->list string->number string->symbol string-append string-ci<=? ' +
      'string-ci<? string-ci=? string-ci>=? string-ci>? string-copy ' +
      'string-fill! string-length string-ref string-set! string<=? string<? ' +
      'string=? string>=? string>? string? substring symbol->string symbol? ' +
      'tan transcript-off transcript-on truncate values vector ' +
      'vector->list vector-fill! vector-length vector-ref vector-set! ' +
      'with-input-from-file with-output-to-file write write-char zero?'
  };

  var LITERAL = {
    className: 'literal',
    begin: '(#t|#f|#\\\\' + SCHEME_IDENT_RE + '|#\\\\.)'
  };

  var NUMBER = {
    className: 'number',
    variants: [
      { begin: SCHEME_SIMPLE_NUMBER_RE, relevance: 0 },
      { begin: SCHEME_COMPLEX_NUMBER_RE, relevance: 0 },
      { begin: '#b[0-1]+(/[0-1]+)?' },
      { begin: '#o[0-7]+(/[0-7]+)?' },
      { begin: '#x[0-9a-f]+(/[0-9a-f]+)?' }
    ]
  };

  var STRING = hljs.QUOTE_STRING_MODE;

  var REGULAR_EXPRESSION = {
    className: 'regexp',
    begin: '#[pr]x"',
    end: '[^\\\\]"'
  };

  var COMMENT_MODES = [
    hljs.COMMENT(
      ';',
      '$',
      {
        relevance: 0
      }
    ),
    hljs.COMMENT('#\\|', '\\|#')
  ];

  var IDENT = {
    begin: SCHEME_IDENT_RE,
    relevance: 0
  };

  var QUOTED_IDENT = {
    className: 'symbol',
    begin: '\'' + SCHEME_IDENT_RE
  };

  var BODY = {
    endsWithParent: true,
    relevance: 0
  };

  var QUOTED_LIST = {
    variants: [
      { begin: /'/ },
      { begin: '`' }
    ],
    contains: [
      {
        begin: '\\(', end: '\\)',
        contains: ['self', LITERAL, STRING, NUMBER, IDENT, QUOTED_IDENT]
      }
    ]
  };

  var NAME = {
    className: 'name',
    begin: SCHEME_IDENT_RE,
    keywords: KEYWORDS
  };

  var LAMBDA = {
    begin: /lambda/, endsWithParent: true, returnBegin: true,
    contains: [
      NAME,
      {
        begin: /\(/, end: /\)/, endsParent: true,
        contains: [IDENT],
      }
    ]
  };

  var LIST = {
    variants: [
      { begin: '\\(', end: '\\)' },
      { begin: '\\[', end: '\\]' }
    ],
    contains: [LAMBDA, NAME, BODY]
  };

  BODY.contains = [LITERAL, NUMBER, STRING, IDENT, QUOTED_IDENT, QUOTED_LIST, LIST].concat(COMMENT_MODES);

  return {
    name: 'Scheme',
    illegal: /\S/,
    contains: [hljs.SHEBANG(), NUMBER, STRING, QUOTED_IDENT, QUOTED_LIST, LIST].concat(COMMENT_MODES)
  };
}
