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// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://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("elm", function() {

    function switchState(source, setState, f) {
      setState(f);
      return f(source, setState);
    }

    // These should all be Unicode extended, as per the Haskell 2010 report
    var smallRE = /[a-z_]/;
    var largeRE = /[A-Z]/;
    var digitRE = /[0-9]/;
    var hexitRE = /[0-9A-Fa-f]/;
    var octitRE = /[0-7]/;
    var idRE = /[a-z_A-Z0-9\']/;
    var symbolRE = /[-!#$%&*+.\/<=>?@\\^|~:\u03BB\u2192]/;
    var specialRE = /[(),;[\]`{}]/;
    var whiteCharRE = /[ \t\v\f]/; // newlines are handled in tokenizer

    function normal() {
      return function (source, setState) {
        if (source.eatWhile(whiteCharRE)) {
          return null;
        }

        var ch = source.next();
        if (specialRE.test(ch)) {
          if (ch == '{' && source.eat('-')) {
            var t = "comment";
            if (source.eat('#')) t = "meta";
            return switchState(source, setState, ncomment(t, 1));
          }
          return null;
        }

        if (ch == '\'') {
          if (source.eat('\\'))
            source.next();  // should handle other escapes here
          else
            source.next();

          if (source.eat('\''))
            return "string";
          return "error";
        }

        if (ch == '"') {
          return switchState(source, setState, stringLiteral);
        }

        if (largeRE.test(ch)) {
          source.eatWhile(idRE);
          if (source.eat('.'))
            return "qualifier";
          return "variable-2";
        }

        if (smallRE.test(ch)) {
          var isDef = source.pos === 1;
          source.eatWhile(idRE);
          return isDef ? "variable-3" : "variable";
        }

        if (digitRE.test(ch)) {
          if (ch == '0') {
            if (source.eat(/[xX]/)) {
              source.eatWhile(hexitRE); // should require at least 1
              return "integer";
            }
            if (source.eat(/[oO]/)) {
              source.eatWhile(octitRE); // should require at least 1
              return "number";
            }
          }
          source.eatWhile(digitRE);
          var t = "number";
          if (source.eat('.')) {
            t = "number";
            source.eatWhile(digitRE); // should require at least 1
          }
          if (source.eat(/[eE]/)) {
            t = "number";
            source.eat(/[-+]/);
            source.eatWhile(digitRE); // should require at least 1
          }
          return t;
        }

        if (symbolRE.test(ch)) {
          if (ch == '-' && source.eat(/-/)) {
            source.eatWhile(/-/);
            if (!source.eat(symbolRE)) {
              source.skipToEnd();
              return "comment";
            }
          }
          source.eatWhile(symbolRE);
          return "builtin";
        }

        return "error";
      }
    }

    function ncomment(type, nest) {
      if (nest == 0) {
        return normal();
      }
      return function(source, setState) {
        var currNest = nest;
        while (!source.eol()) {
          var ch = source.next();
          if (ch == '{' && source.eat('-')) {
            ++currNest;
          } else if (ch == '-' && source.eat('}')) {
            --currNest;
            if (currNest == 0) {
              setState(normal());
              return type;
            }
          }
        }
        setState(ncomment(type, currNest));
        return type;
      }
    }

    function stringLiteral(source, setState) {
      while (!source.eol()) {
        var ch = source.next();
        if (ch == '"') {
          setState(normal());
          return "string";
        }
        if (ch == '\\') {
          if (source.eol() || source.eat(whiteCharRE)) {
            setState(stringGap);
            return "string";
          }
          if (!source.eat('&')) source.next(); // should handle other escapes here
        }
      }
      setState(normal());
      return "error";
    }

    function stringGap(source, setState) {
      if (source.eat('\\')) {
        return switchState(source, setState, stringLiteral);
      }
      source.next();
      setState(normal());
      return "error";
    }


    var wellKnownWords = (function() {
      var wkw = {};

      var keywords = [
        "case", "of", "as",
        "if", "then", "else",
        "let", "in",
        "infix", "infixl", "infixr",
        "type", "alias",
        "input", "output", "foreign", "loopback",
        "module", "where", "import", "exposing",
        "_", "..", "|", ":", "=", "\\", "\"", "->", "<-"
      ];

      for (var i = keywords.length; i--;)
        wkw[keywords[i]] = "keyword";

      return wkw;
    })();



    return {
      startState: function ()  { return { f: normal() }; },
      copyState:  function (s) { return { f: s.f }; },

      token: function(stream, state) {
        var t = state.f(stream, function(s) { state.f = s; });
        var w = stream.current();
        return (wellKnownWords.hasOwnProperty(w)) ? wellKnownWords[w] : t;
      }
    };

  });

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