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// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

// Originally written by Alf Nielsen, re-written by Michael Zhou
(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";

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

CodeMirror.defineMode("vhdl", function(config, parserConfig) {
  var indentUnit = config.indentUnit,
      atoms = parserConfig.atoms || words("null"),
      hooks = parserConfig.hooks || {"`": metaHook, "$": metaHook},
      multiLineStrings = parserConfig.multiLineStrings;

var keywords = words("abs,access,after,alias,all,and,architecture,array,assert,attribute,begin,block," +
      "body,buffer,bus,case,component,configuration,constant,disconnect,downto,else,elsif,end,end block,end case," +
      "end component,end for,end generate,end if,end loop,end process,end record,end units,entity,exit,file,for," +
      "function,generate,generic,generic map,group,guarded,if,impure,in,inertial,inout,is,label,library,linkage," +
      "literal,loop,map,mod,nand,new,next,nor,null,of,on,open,or,others,out,package,package body,port,port map," +
      "postponed,procedure,process,pure,range,record,register,reject,rem,report,return,rol,ror,select,severity,signal," +
      "sla,sll,sra,srl,subtype,then,to,transport,type,unaffected,units,until,use,variable,wait,when,while,with,xnor,xor");

var blockKeywords = words("architecture,entity,begin,case,port,else,elsif,end,for,function,if");

var isOperatorChar = /[&|~><!\)\(*#%@+\/=?\:;}{,\.\^\-\[\]]/;
  var curPunc;

// 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: "{}"
  };
});

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

});