CodeMirror.defineMode("verilog", function(config, parserConfig) {
  var indentUnit = config.indentUnit,
      keywords = parserConfig.keywords || {},
      blockKeywords = parserConfig.blockKeywords || {},
      atoms = parserConfig.atoms || {},
      hooks = parserConfig.hooks || {},
      multiLineStrings = parserConfig.multiLineStrings;
  var isOperatorChar = /[&|~><!\)\(*#%@+\/=?\:;}{,\.\^\-\[\]]/;

  var curPunc;

  function tokenBase(stream, state) {
    var ch = stream.next();
    if (hooks[ch]) {
      var result = hooks[ch](stream, state);
      if (result !== false) return result;
    }
    if (ch == '"') {
      state.tokenize = tokenString(ch);
      return state.tokenize(stream, state);
    }
    if (/[\[\]{}\(\),;\:\.]/.test(ch)) {
      curPunc = ch;
      return null;
    }
    if (/[\d']/.test(ch)) {
      stream.eatWhile(/[\w\.']/);
      return "number";
    }
    if (ch == "/") {
      if (stream.eat("*")) {
        state.tokenize = tokenComment;
        return tokenComment(stream, state);
      }
      if (stream.eat("/")) {
        stream.skipToEnd();
        return "comment";
      }
    }
    if (isOperatorChar.test(ch)) {
      stream.eatWhile(isOperatorChar);
      return "operator";
    }
    stream.eatWhile(/[\w\$_]/);
    var cur = stream.current();
    if (keywords.propertyIsEnumerable(cur)) {
      if (blockKeywords.propertyIsEnumerable(cur)) curPunc = "newstatement";
      return "keyword";
    }
    if (atoms.propertyIsEnumerable(cur)) return "atom";
    return "variable";
  }

  function tokenString(quote) {
    return function(stream, state) {
      var escaped = false, next, end = false;
      while ((next = stream.next()) != null) {
        if (next == quote && !escaped) {end = true; break;}
        escaped = !escaped && next == "\\";
      }
      if (end || !(escaped || multiLineStrings))
        state.tokenize = tokenBase;
      return "string";
    };
  }

  function tokenComment(stream, state) {
    var maybeEnd = false, ch;
    while (ch = stream.next()) {
      if (ch == "/" && maybeEnd) {
        state.tokenize = tokenBase;
        break;
      }
      maybeEnd = (ch == "*");
    }
    return "comment";
  }

  function Context(indented, column, type, align, prev) {
    this.indented = indented;
    this.column = column;
    this.type = type;
    this.align = align;
    this.prev = prev;
  }
  function pushContext(state, col, type) {
    return state.context = new Context(state.indented, col, type, null, state.context);
  }
  function popContext(state) {
    var t = state.context.type;
    if (t == ")" || t == "]" || t == "}")
      state.indented = state.context.indented;
    return state.context = state.context.prev;
  }

  // Interface

  return {
    startState: function(basecolumn) {
      return {
        tokenize: null,
        context: new Context((basecolumn || 0) - indentUnit, 0, "top", false),
        indented: 0,
        startOfLine: true
      };
    },

    token: function(stream, state) {
      var ctx = state.context;
      if (stream.sol()) {
        if (ctx.align == null) ctx.align = false;
        state.indented = stream.indentation();
        state.startOfLine = true;
      }
      if (stream.eatSpace()) return null;
      curPunc = null;
      var style = (state.tokenize || tokenBase)(stream, state);
      if (style == "comment" || style == "meta") return style;
      if (ctx.align == null) ctx.align = true;

      if ((curPunc == ";" || curPunc == ":") && ctx.type == "statement") popContext(state);
      else if (curPunc == "{") pushContext(state, stream.column(), "}");
      else if (curPunc == "[") pushContext(state, stream.column(), "]");
      else if (curPunc == "(") pushContext(state, stream.column(), ")");
      else if (curPunc == "}") {
        while (ctx.type == "statement") ctx = popContext(state);
        if (ctx.type == "}") ctx = popContext(state);
        while (ctx.type == "statement") ctx = popContext(state);
      }
      else if (curPunc == ctx.type) popContext(state);
      else if (ctx.type == "}" || ctx.type == "top" || (ctx.type == "statement" && curPunc == "newstatement"))
        pushContext(state, stream.column(), "statement");
      state.startOfLine = false;
      return style;
    },

    indent: function(state, textAfter) {
      if (state.tokenize != tokenBase && state.tokenize != null) return 0;
      var firstChar = textAfter && textAfter.charAt(0), ctx = state.context, closing = firstChar == ctx.type;
      if (ctx.type == "statement") return ctx.indented + (firstChar == "{" ? 0 : indentUnit);
      else if (ctx.align) return ctx.column + (closing ? 0 : 1);
      else return ctx.indented + (closing ? 0 : indentUnit);
    },

    electricChars: "{}"
  };
});

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

  var verilogKeywords = "always and assign automatic begin buf bufif0 bufif1 case casex casez cell cmos config " +
    "deassign default defparam design disable edge else end endcase endconfig endfunction endgenerate endmodule " +
    "endprimitive endspecify endtable endtask event for force forever fork function generate genvar highz0 " +
    "highz1 if ifnone incdir include initial inout input instance integer join large liblist library localparam " +
    "macromodule medium module nand negedge nmos nor noshowcancelled not notif0 notif1 or output parameter pmos " +
    "posedge primitive pull0 pull1 pulldown pullup pulsestyle_onevent pulsestyle_ondetect rcmos real realtime " +
    "reg release repeat rnmos rpmos rtran rtranif0 rtranif1 scalared showcancelled signed small specify specparam " +
    "strong0 strong1 supply0 supply1 table task time tran tranif0 tranif1 tri tri0 tri1 triand trior trireg " +
    "unsigned use vectored wait wand weak0 weak1 while wire wor xnor xor";

  var verilogBlockKeywords = "begin bufif0 bufif1 case casex casez config else end endcase endconfig endfunction " +
    "endgenerate endmodule endprimitive endspecify endtable endtask for forever function generate if ifnone " +
    "macromodule module primitive repeat specify table task while";

  function metaHook(stream, state) {
    stream.eatWhile(/[\w\$_]/);
    return "meta";
  }

  // C#-style strings where "" escapes a quote.
  function tokenAtString(stream, state) {
    var next;
    while ((next = stream.next()) != null) {
      if (next == '"' && !stream.eat('"')) {
        state.tokenize = null;
        break;
      }
    }
    return "string";
  }

  CodeMirror.defineMIME("text/x-verilog", {
    name: "verilog",
    keywords: words(verilogKeywords),
    blockKeywords: words(verilogBlockKeywords),
    atoms: words("null"),
    hooks: {"`": metaHook, "$": metaHook}
  });
}());
