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// 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");

});