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[EDIT] FILE: sieve.js

// 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("sieve", function(config) {
  function words(str) {
    var obj = {}, words = str.split(" ");
    for (var i = 0; i < words.length; ++i) obj[words[i]] = true;
    return obj;
  }

var keywords = words("if elsif else stop require");
  var atoms = words("true false not");
  var indentUnit = config.indentUnit;

function tokenBase(stream, state) {

var ch = stream.next();
    if (ch == "/" && stream.eat("*")) {
      state.tokenize = tokenCComment;
      return tokenCComment(stream, state);
    }

if (ch === '#') {
      stream.skipToEnd();
      return "comment";
    }

if (ch == "\"") {
      state.tokenize = tokenString(ch);
      return state.tokenize(stream, state);
    }

if (ch == "(") {
      state._indent.push("(");
      // add virtual angel wings so that editor behaves...
      // ...more sane in case of broken brackets
      state._indent.push("{");
      return null;
    }

if (ch === "{") {
      state._indent.push("{");
      return null;
    }

if (ch == ")")  {
      state._indent.pop();
      state._indent.pop();
    }

if (ch === "}") {
      state._indent.pop();
      return null;
    }

if (ch == ",")
      return null;

if (ch == ";")
      return null;

if (/[{}\(\),;]/.test(ch))
      return null;

// 1*DIGIT "K" / "M" / "G"
    if (/\d/.test(ch)) {
      stream.eatWhile(/[\d]/);
      stream.eat(/[KkMmGg]/);
      return "number";
    }

// ":" (ALPHA / "_") *(ALPHA / DIGIT / "_")
    if (ch == ":") {
      stream.eatWhile(/[a-zA-Z_]/);
      stream.eatWhile(/[a-zA-Z0-9_]/);

return "operator";
    }

stream.eatWhile(/\w/);
    var cur = stream.current();

// "text:" *(SP / HTAB) (hash-comment / CRLF)
    // *(multiline-literal / multiline-dotstart)
    // "." CRLF
    if ((cur == "text") && stream.eat(":"))
    {
      state.tokenize = tokenMultiLineString;
      return "string";
    }

if (keywords.propertyIsEnumerable(cur))
      return "keyword";

if (atoms.propertyIsEnumerable(cur))
      return "atom";

return null;
  }

function tokenMultiLineString(stream, state)
  {
    state._multiLineString = true;
    // the first line is special it may contain a comment
    if (!stream.sol()) {
      stream.eatSpace();

if (stream.peek() == "#") {
        stream.skipToEnd();
        return "comment";
      }

stream.skipToEnd();
      return "string";
    }

if ((stream.next() == ".")  && (stream.eol()))
    {
      state._multiLineString = false;
      state.tokenize = tokenBase;
    }

return "string";
  }

return {
    startState: function(base) {
      return {tokenize: tokenBase,
              baseIndent: base || 0,
              _indent: []};
    },

token: function(stream, state) {
      if (stream.eatSpace())
        return null;

return (state.tokenize || tokenBase)(stream, state);
    },

indent: function(state, _textAfter) {
      var length = state._indent.length;
      if (_textAfter && (_textAfter[0] == "}"))
        length--;

if (length <0)
        length = 0;

return length * indentUnit;
    },

electricChars: "}"
  };
});

CodeMirror.defineMIME("application/sieve", "sieve");

});

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