// CodeMirror, copyright (c) by Marijn Haverbeke and others

// Distributed under an MIT license: https://codemirror.net/LICENSE



(function(mod) {

  if (typeof exports == "object" && typeof module == "object") // CommonJS

    mod(require("../../lib/codemirror"));

  else if (typeof define == "function" && define.amd) // AMD

    define(["../../lib/codemirror"], mod);

  else // Plain browser env

    mod(CodeMirror);

})(function(CodeMirror) {

"use strict";



CodeMirror.defineMode("octave", function() {

  function wordRegexp(words) {

    return new RegExp("^((" + words.join(")|(") + "))\\b");

  }



  var singleOperators = new RegExp("^[\\+\\-\\*/&|\\^~<>!@'\\\\]");

  var singleDelimiters = new RegExp('^[\\(\\[\\{\\},:=;]');

  var doubleOperators = new RegExp("^((==)|(~=)|(<=)|(>=)|(<<)|(>>)|(\\.[\\+\\-\\*/\\^\\\\]))");

  var doubleDelimiters = new RegExp("^((!=)|(\\+=)|(\\-=)|(\\*=)|(/=)|(&=)|(\\|=)|(\\^=))");

  var tripleDelimiters = new RegExp("^((>>=)|(<<=))");

  var expressionEnd = new RegExp("^[\\]\\)]");

  var identifiers = new RegExp("^[_A-Za-z\xa1-\uffff][_A-Za-z0-9\xa1-\uffff]*");



  var builtins = wordRegexp([

    'error', 'eval', 'function', 'abs', 'acos', 'atan', 'asin', 'cos',

    'cosh', 'exp', 'log', 'prod', 'sum', 'log10', 'max', 'min', 'sign', 'sin', 'sinh',

    'sqrt', 'tan', 'reshape', 'break', 'zeros', 'default', 'margin', 'round', 'ones',

    'rand', 'syn', 'ceil', 'floor', 'size', 'clear', 'zeros', 'eye', 'mean', 'std', 'cov',

    'det', 'eig', 'inv', 'norm', 'rank', 'trace', 'expm', 'logm', 'sqrtm', 'linspace', 'plot',

    'title', 'xlabel', 'ylabel', 'legend', 'text', 'grid', 'meshgrid', 'mesh', 'num2str',

    'fft', 'ifft', 'arrayfun', 'cellfun', 'input', 'fliplr', 'flipud', 'ismember'

  ]);



  var keywords = wordRegexp([

    'return', 'case', 'switch', 'else', 'elseif', 'end', 'endif', 'endfunction',

    'if', 'otherwise', 'do', 'for', 'while', 'try', 'catch', 'classdef', 'properties', 'events',

    'methods', 'global', 'persistent', 'endfor', 'endwhile', 'printf', 'sprintf', 'disp', 'until',

    'continue', 'pkg'

  ]);





  // tokenizers

  function tokenTranspose(stream, state) {

    if (!stream.sol() && stream.peek() === '\'') {

      stream.next();

      state.tokenize = tokenBase;

      return 'operator';

    }

    state.tokenize = tokenBase;

    return tokenBase(stream, state);

  }





  function tokenComment(stream, state) {

    if (stream.match(/^.*%}/)) {

      state.tokenize = tokenBase;

      return 'comment';

    };

    stream.skipToEnd();

    return 'comment';

  }



  function tokenBase(stream, state) {

    // whitespaces

    if (stream.eatSpace()) return null;



    // Handle one line Comments

    if (stream.match('%{')){

      state.tokenize = tokenComment;

      stream.skipToEnd();

      return 'comment';

    }



    if (stream.match(/^[%#]/)){

      stream.skipToEnd();

      return 'comment';

    }



    // Handle Number Literals

    if (stream.match(/^[0-9\.+-]/, false)) {

      if (stream.match(/^[+-]?0x[0-9a-fA-F]+[ij]?/)) {

        stream.tokenize = tokenBase;

        return 'number'; };

      if (stream.match(/^[+-]?\d*\.\d+([EeDd][+-]?\d+)?[ij]?/)) { return 'number'; };

      if (stream.match(/^[+-]?\d+([EeDd][+-]?\d+)?[ij]?/)) { return 'number'; };

    }

    if (stream.match(wordRegexp(['nan','NaN','inf','Inf']))) { return 'number'; };



    // Handle Strings

    var m = stream.match(/^"(?:[^"]|"")*("|$)/) || stream.match(/^'(?:[^']|'')*('|$)/)

    if (m) { return m[1] ? 'string' : "string error"; }



    // Handle words

    if (stream.match(keywords)) { return 'keyword'; } ;

    if (stream.match(builtins)) { return 'builtin'; } ;

    if (stream.match(identifiers)) { return 'variable'; } ;



    if (stream.match(singleOperators) || stream.match(doubleOperators)) { return 'operator'; };

    if (stream.match(singleDelimiters) || stream.match(doubleDelimiters) || stream.match(tripleDelimiters)) { return null; };



    if (stream.match(expressionEnd)) {

      state.tokenize = tokenTranspose;

      return null;

    };





    // Handle non-detected items

    stream.next();

    return 'error';

  };





  return {

    startState: function() {

      return {

        tokenize: tokenBase

      };

    },



    token: function(stream, state) {

      var style = state.tokenize(stream, state);

      if (style === 'number' || style === 'variable'){

        state.tokenize = tokenTranspose;

      }

      return style;

    },



    lineComment: '%',



    fold: 'indent'

  };

});



CodeMirror.defineMIME("text/x-octave", "octave");



});

