/*
Language: XQuery
Author: Dirk Kirsten <dk@basex.org>
Contributor: Duncan Paterson
Description: Supports XQuery 3.1 including XQuery Update 3, so also XPath (as it is a superset)
Refactored to process xml constructor syntax and function-bodies. Added missing data-types, xpath operands, inbuilt functions, and query prologs
Website: https://www.w3.org/XML/Query/
Category: functional
*/

function xquery(hljs) {
  // see https://www.w3.org/TR/xquery/#id-terminal-delimitation
  const KEYWORDS =
    'module schema namespace boundary-space preserve no-preserve strip default collation base-uri ordering context decimal-format decimal-separator copy-namespaces empty-sequence except exponent-separator external grouping-separator inherit no-inherit lax minus-sign per-mille percent schema-attribute schema-element strict unordered zero-digit ' +
    'declare import option function validate variable ' +
    'for at in let where order group by return if then else ' +
    'tumbling sliding window start when only end previous next stable ' +
    'ascending descending allowing empty greatest least some every satisfies switch case typeswitch try catch ' +
    'and or to union intersect instance of treat as castable cast map array ' +
    'delete insert into replace value rename copy modify update';

  // Node Types (sorted by inheritance)
  // atomic types (sorted by inheritance)
  const TYPE =
    'item document-node node attribute document element comment namespace namespace-node processing-instruction text construction ' +
    'xs:anyAtomicType xs:untypedAtomic xs:duration xs:time xs:decimal xs:float xs:double xs:gYearMonth xs:gYear xs:gMonthDay xs:gMonth xs:gDay xs:boolean xs:base64Binary xs:hexBinary xs:anyURI xs:QName xs:NOTATION xs:dateTime xs:dateTimeStamp xs:date xs:string xs:normalizedString xs:token xs:language xs:NMTOKEN xs:Name xs:NCName xs:ID xs:IDREF xs:ENTITY xs:integer xs:nonPositiveInteger xs:negativeInteger xs:long xs:int xs:short xs:byte xs:nonNegativeInteger xs:unisignedLong xs:unsignedInt xs:unsignedShort xs:unsignedByte xs:positiveInteger xs:yearMonthDuration xs:dayTimeDuration';

  const LITERAL =
    'eq ne lt le gt ge is ' +
    'self:: child:: descendant:: descendant-or-self:: attribute:: following:: following-sibling:: parent:: ancestor:: ancestor-or-self:: preceding:: preceding-sibling:: ' +
    'NaN';

  // functions (TODO: find regex for op: without breaking build)
  const BUILT_IN = {
    className: 'built_in',
    variants: [
      {
        begin: /\barray:/,
        end: /(?:append|filter|flatten|fold-(?:left|right)|for-each(?:-pair)?|get|head|insert-before|join|put|remove|reverse|size|sort|subarray|tail)\b/
      },
      {
        begin: /\bmap:/,
        end: /(?:contains|entry|find|for-each|get|keys|merge|put|remove|size)\b/
      },
      {
        begin: /\bmath:/,
        end: /(?:a(?:cos|sin|tan[2]?)|cos|exp(?:10)?|log(?:10)?|pi|pow|sin|sqrt|tan)\b/
      },
      {
        begin: /\bop:/,
        end: /\(/,
        excludeEnd: true
      },
      {
        begin: /\bfn:/,
        end: /\(/,
        excludeEnd: true
      },
      // do not highlight inbuilt strings as variable or xml element names
      {
        begin: /[^<\/\$:'"-]\b(?:abs|accumulator-(?:after|before)|adjust-(?:date(?:Time)?|time)-to-timezone|analyze-string|apply|available-(?:environment-variables|system-properties)|avg|base-uri|boolean|ceiling|codepoints?-(?:equal|to-string)|collation-key|collection|compare|concat|contains(?:-token)?|copy-of|count|current(?:-)?(?:date(?:Time)?|time|group(?:ing-key)?|output-uri|merge-(?:group|key))?data|dateTime|days?-from-(?:date(?:Time)?|duration)|deep-equal|default-(?:collation|language)|distinct-values|document(?:-uri)?|doc(?:-available)?|element-(?:available|with-id)|empty|encode-for-uri|ends-with|environment-variable|error|escape-html-uri|exactly-one|exists|false|filter|floor|fold-(?:left|right)|for-each(?:-pair)?|format-(?:date(?:Time)?|time|integer|number)|function-(?:arity|available|lookup|name)|generate-id|has-children|head|hours-from-(?:dateTime|duration|time)|id(?:ref)?|implicit-timezone|in-scope-prefixes|index-of|innermost|insert-before|iri-to-uri|json-(?:doc|to-xml)|key|lang|last|load-xquery-module|local-name(?:-from-QName)?|(?:lower|upper)-case|matches|max|minutes-from-(?:dateTime|duration|time)|min|months?-from-(?:date(?:Time)?|duration)|name(?:space-uri-?(?:for-prefix|from-QName)?)?|nilled|node-name|normalize-(?:space|unicode)|not|number|one-or-more|outermost|parse-(?:ietf-date|json)|path|position|(?:prefix-from-)?QName|random-number-generator|regex-group|remove|replace|resolve-(?:QName|uri)|reverse|root|round(?:-half-to-even)?|seconds-from-(?:dateTime|duration|time)|snapshot|sort|starts-with|static-base-uri|stream-available|string-?(?:join|length|to-codepoints)?|subsequence|substring-?(?:after|before)?|sum|system-property|tail|timezone-from-(?:date(?:Time)?|time)|tokenize|trace|trans(?:form|late)|true|type-available|unordered|unparsed-(?:entity|text)?-?(?:public-id|uri|available|lines)?|uri-collection|xml-to-json|years?-from-(?:date(?:Time)?|duration)|zero-or-one)\b/
      },
      {
        begin: /\blocal:/,
        end: /\(/,
        excludeEnd: true
      },
      {
        begin: /\bzip:/,
        end: /(?:zip-file|(?:xml|html|text|binary)-entry| (?:update-)?entries)\b/
      },
      {
        begin: /\b(?:util|db|functx|app|xdmp|xmldb):/,
        end: /\(/,
        excludeEnd: true
      }
    ]
  };

  const TITLE = {
    className: 'title',
    begin: /\bxquery version "[13]\.[01]"\s?(?:encoding ".+")?/,
    end: /;/
  };

  const VAR = {
    className: 'variable',
    begin: /[$][\w\-:]+/
  };

  const NUMBER = {
    className: 'number',
    begin: '(\\b0[0-7_]+)|(\\b0x[0-9a-fA-F_]+)|(\\b[1-9][0-9_]*(\\.[0-9_]+)?)|[0_]\\b',
    relevance: 0
  };

  const STRING = {
    className: 'string',
    variants: [
      {
        begin: /"/,
        end: /"/,
        contains: [
          {
            begin: /""/,
            relevance: 0
          }
        ]
      },
      {
        begin: /'/,
        end: /'/,
        contains: [
          {
            begin: /''/,
            relevance: 0
          }
        ]
      }
    ]
  };

  const ANNOTATION = {
    className: 'meta',
    begin: /%[\w\-:]+/
  };

  const COMMENT = {
    className: 'comment',
    begin: '\\(:',
    end: ':\\)',
    relevance: 10,
    contains: [
      {
        className: 'doctag',
        begin: '@\\w+'
      }
    ]
  };

  // see https://www.w3.org/TR/xquery/#id-computedConstructors
  // mocha: computed_inbuilt
  // see https://www.regexpal.com/?fam=99749
  const COMPUTED = {
    beginKeywords: 'element attribute comment document processing-instruction',
    end: /\{/,
    excludeEnd: true
  };

  // mocha: direct_method
  const DIRECT = {
    begin: /<([\w\._:\-]+)(\s+\S*=('|").*('|"))?>/,
    end: /(\/[\w\._:\-]+>)/,
    subLanguage: 'xml',
    contains: [
      {
        begin: /\{/,
        end: /\}/,
        subLanguage: 'xquery'
      },
      'self'
    ]
  };

  const CONTAINS = [
    VAR,
    BUILT_IN,
    STRING,
    NUMBER,
    COMMENT,
    ANNOTATION,
    TITLE,
    COMPUTED,
    DIRECT
  ];

  return {
    name: 'XQuery',
    aliases: [
      'xpath',
      'xq'
    ],
    case_insensitive: false,
    illegal: /(proc)|(abstract)|(extends)|(until)|(#)/,
    keywords: {
      $pattern: /[a-zA-Z\$][a-zA-Z0-9_:\-]*/,
      keyword: KEYWORDS,
      type: TYPE,
      literal: LITERAL
    },
    contains: CONTAINS
  };
}

module.exports = xquery;