%% This is part of the OpTeX project, see http://petr.olsak.net/optex
%% Author: Vojtěch Hořánek, <https://github.com/vojta-horanek/hisyntax-kt>

\_codedecl \_hisyntaxkt {Syntax highlighting for Kotlin sources <2024-05-18>}

\_newtoks \_hisyntaxkt  \_newtoks \_hicolorskt

\_global\_hicolorskt={     % colors for Kotlin language
   \_hicolor C \Grey       % Comments
   \_hicolor D \Green      % Documentation comments
   \_hicolor W \Yellow     % Warnings
   \_hicolor S \Green      % Strings   
   \_hicolor K \Blue       % Keywords
   \_hicolor F \Blue       % Std. functions
   \_hicolor A \Yellow     % Annotations
   \_hicolor N \Cyan       % Numbers
   \_hicolor T \Brown      % Templates
   \_hicolor I \Grey       % Imports
   \_hicolor O \Magenta    % Others
}

\_global\_hisyntaxkt={%
   \_the\_hicolorskt
   \_let\c=\_relax \_let\e=\_relax \_let\o=\_relax
   % comments
   \_replthis   {FIXME}          {\z W{FIXME}}%               FIXME in comment
   \_replthis   {TODO}           {\z W{TODO}}%                TODO in comment
   \_replfromto {/**}{*/}        {\x D{/**#1*/}}%             /**...*/ documentation
   \_replfromto {/*}{*/}         {\x C{/*#1*/}}%              /*...*/ multi-line
   \_replfromto {//}{^^J}        {\z C{//#1}^^J}%             //... single-line
   % strings
   \_replfromto {\_csstring\$\_csstring\{}{\_csstring\}}%     string template expression ${tmp}
                {\z T{\_csstring\$\_csstring\{#1\_csstring\}}}%
   \_replfromto {\_csstring\$}{\n}  {\x T{\_csstring\$#1}}%   string template $tmp
   \_replthis   {\_string\"}     {{\_string\"}}%              \" string escape
   \_replfromto {"}{"}           {\x S{"#1"}}%                "..." string
   % characters
   \_replthis   {\_string\'}     {{\_string\'}}%              \' char escape
   \_replfromto {'}{'}           {\x S{'#1'}}%                '.' character
   % others
   \_replfromto {\n@}{\n}        {\z A{@#1}}%                 annotations
   \_replfromto {package}{^^J}   {\z K{package}\z I{#1}^^J}%  package...
   \_replfromto {import}{^^J}    {\z K{import}\z I{#1}^^J}%   import...
   \_replfromto {return@}{\n}    {\z K{return}\z O{@#1}}%     return@...
   \_replfromto {continue@}{\n}  {\z K{continue}\z O{@#1}}%   continue@...
   \_replfromto {break@}{\n}    {\z K{break}\z O{@#1}}%       break@...
   % Special characters
   \_replthis{;}{\z C{;}} % semi-collon
   \_replthis{?:}{\n\o?:\n} % elvis operator
   \_edef\_tmpa {()\_string{\_string}+-*/=[]<>,:\_pcent\_string&|!}% non-letters
   \_ea \_foreach \_tmpa 
      \_do {\_replthis{#1}{\n\o#1\n}}
   %
   \_foreach % keywords
      {as}{as?}{break}{class}{continue}{do}{else}{false}{for}{fun}%
      {if}{in}{!in}{interface}{is}{!is}{null}{object}{package}%
      {return}{super}{this}{throw}{true}{try}{typealias}{typeof}%
      {val}{var}{when}{while}{by}{catch}{constructor}{dynamic}%
      {finally}{get}{import}{init}{set}{value}{class}{where}%
      {abstract}{actual}{annotation}{companion}{const}{crossinline}%
      {data}{enum}{expect}{external}{final}{infix}{inline}{inner}%
      {internal}{lateinit}{noinline}{open}{operator}{out}{override}%
      {private}{protected}{public}{reified}{sealed}{suspend}{tailrec}%
      {vararg}{it}{equals}{compareTo}{get()}{get}{set}{set(value)}%
      \_do {\_replthis{\n#1\n}{\z K{#1}}}
   %
   \_foreach % standard library extension functions
      {all}{also}{any}{apply}{asIterable}{asSequence}{associate}%
      {associateBy}{associateByTo}{associateTo}{associateWith}%
      {associateWithTo}{average}{chunked}{contains}{count}{distinct}%
      {distinctBy}{drop}{dropLast}{dropLastWhile}{dropWhile}{elementAt}%
      {elementAtOrElse}{elementAtOrNull}{filter}{filterIndexed}%
      {filterIndexedTo}{filterIsInstance}{filterIsInstanceTo}{filterNot}%
      {filterNotNull}{filterNotNullTo}{filterNotTo}{filterTo}{find}%
      {findLast}{first}{firstNotNullOf}{firstNotNullOfOrNull}%
      {firstOrNull}{flatMap}{flatMapIndexed}{flatMapIndexedTo}%
      {flatMapTo}{fold}{foldIndexed}{foldRight}{foldRightIndexed}%
      {forEach}{forEachIndexed}{getOrElse}{getOrNull}{groupBy}%
      {groupByTo}{groupingBy}{indexOf}{indexOfFirst}{indexOfLast}%
      {intersect}{iterator}{joinTo}{joinToString}{last}{lastIndexOf}%
      {lastOrNull}{let}{map}{mapIndexed}{mapIndexedNotNull}%
      {mapIndexedNotNullTo}{mapIndexedTo}{mapNotNull}{mapNotNullTo}%
      {mapTo}{max}{maxBy}{maxByOrNull}{maxOf}{maxOfOrNull}{maxOfWith}%
      {maxOfWithOrNull}{maxOrNull}{maxWith}{maxWithOrNull}{min}{minBy}%
      {minByOrNull}{minOf}{minOfOrNull}{minOfWith}{minOfWithOrNull}%
      {minOrNull}{minus}{minusElement}{minWith}{minWithOrNull}{none}%
      {onEach}{onEachIndexed}{partition}{plus}{plusElement}{random}%
      {randomOrNull}{reduce}{reduceIndexed}{reduceIndexedOrNull}%
      {reduceOrNull}{reduceRight}{reduceRightIndexed}%
      {reduceRightIndexedOrNull}{reduceRightOrNull}{repeat}%
      {requireNoNulls}{reverse}{reversed}{runningFold}%
      {runningFoldIndexed}{runningReduce}{runningReduceIndexed}{scan}%
      {scanIndexed}{shuffle}{single}{singleOrNull}{slice}{sortBy}%
      {sortByDescending}{sortDescending}{sorted}{sortedBy}%
      {sortedByDescending}{sortedDescending}{sortedWith}{subtract}{sum}%
      {sumBy}{sumByDouble}{sumOf}{take}{takeIf}{takeLast}%
      {takeLastWhile}{takeUnless}{takeWhile}{toBooleanArray}%
      {toByteArray}{toCharArray}{toCollection}{toDoubleArray}%
      {toFloatArray}{toHashSet}{toIntArray}{toList}{toLongArray}%
      {toMutableList}{toMutableSet}{toSet}{toShortArray}{union}%
      {windowed}{withIndex}{zip}{zipWithNext}{contract}%
      \_do {\_replthis{.#1\n}{.\z F{#1}}%
           \_replthis{\n#1\n}{\z F{#1}}}% invoke operators ( and { begin with \n 
   %
   \_replthis{.}{\n.\n} % numbers
   \_foreach 0123456789
      \_do {\_replfromto{\n#1}{\n}{\c#1##1\e}}
   \_replthis{\e.\c}{.}
   \_replthis{\e.\n}{.\e}
   \_replthis{\n.\c}{\c.}
   \_replthis{e\e\o+\c}{e+}\_replthis{e\e\o-\c}{e-}
   \_replthis{E\e\o+\c}{E+}\_replthis{E\e\o-\c}{E-}
   \_def\c#1\e{\z N{#1}}
   \_def\o#1{\z O{#1}} % others
}

\_endcode %------------------------------------------------


\endinput

2024-05-18: First version