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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"),  require("../../addon/mode/multiplex"));
  else if (typeof define == "function" && define.amd) // AMD
    define(["../../lib/codemirror", "../../addon/mode/multiplex"], mod);
  else // Plain browser env
    mod(CodeMirror);
})(function(CodeMirror) {
  "use strict";

  CodeMirror.defineMode("twig:inner", function() {
    var keywords = ["and", "as", "autoescape", "endautoescape", "block", "do", "endblock", "else", "elseif", "extends", "for", "endfor", "embed", "endembed", "filter", "endfilter", "flush", "from", "if", "endif", "in", "is", "include", "import", "not", "or", "set", "spaceless", "endspaceless", "with", "endwith", "trans", "endtrans", "blocktrans", "endblocktrans", "macro", "endmacro", "use", "verbatim", "endverbatim"],
        operator = /^[+\-*&%=<>!?|~^]/,
        sign = /^[:\[\(\{]/,
        atom = ["true", "false", "null", "empty", "defined", "divisibleby", "divisible by", "even", "odd", "iterable", "sameas", "same as"],
        number = /^(\d[+\-\*\/])?\d+(\.\d+)?/;

    keywords = new RegExp("((" + keywords.join(")|(") + "))\\b");
    atom = new RegExp("((" + atom.join(")|(") + "))\\b");

    function tokenBase (stream, state) {
      var ch = stream.peek();

      //Comment
      if (state.incomment) {
        if (!stream.skipTo("#}")) {
          stream.skipToEnd();
        } else {
          stream.eatWhile(/\#|}/);
          state.incomment = false;
        }
        return "comment";
      //Tag
      } else if (state.intag) {
        //After operator
        if (state.operator) {
          state.operator = false;
          if (stream.match(atom)) {
            return "atom";
          }
          if (stream.match(number)) {
            return "number";
          }
        }
        //After sign
        if (state.sign) {
          state.sign = false;
          if (stream.match(atom)) {
            return "atom";
          }
          if (stream.match(number)) {
            return "number";
          }
        }

        if (state.instring) {
          if (ch == state.instring) {
            state.instring = false;
          }
          stream.next();
          return "string";
        } else if (ch == "'" || ch == '"') {
          state.instring = ch;
          stream.next();
          return "string";
        } else if (stream.match(state.intag + "}") || stream.eat("-") && stream.match(state.intag + "}")) {
          state.intag = false;
          return "tag";
        } else if (stream.match(operator)) {
          state.operator = true;
          return "operator";
        } else if (stream.match(sign)) {
          state.sign = true;
        } else {
          if (stream.eat(" ") || stream.sol()) {
            if (stream.match(keywords)) {
              return "keyword";
            }
            if (stream.match(atom)) {
              return "atom";
            }
            if (stream.match(number)) {
              return "number";
            }
            if (stream.sol()) {
              stream.next();
            }
          } else {
            stream.next();
          }

        }
        return "variable";
      } else if (stream.eat("{")) {
        if (ch = stream.eat("#")) {
          state.incomment = true;
          if (!stream.skipTo("#}")) {
            stream.skipToEnd();
          } else {
            stream.eatWhile(/\#|}/);
            state.incomment = false;
          }
          return "comment";
        //Open tag
        } else if (ch = stream.eat(/\{|%/)) {
          //Cache close tag
          state.intag = ch;
          if (ch == "{") {
            state.intag = "}";
          }
          stream.eat("-");
          return "tag";
        }
      }
      stream.next();
    };

    return {
      startState: function () {
        return {};
      },
      token: function (stream, state) {
        return tokenBase(stream, state);
      }
    };
  });

  CodeMirror.defineMode("twig", function(config, parserConfig) {
    var twigInner = CodeMirror.getMode(config, "twig:inner");
    if (!parserConfig || !parserConfig.base) return twigInner;
    return CodeMirror.multiplexingMode(
      CodeMirror.getMode(config, parserConfig.base), {
        open: /\{[{#%]/, close: /[}#%]\}/, mode: twigInner, parseDelimiters: true
      }
    );
  });
  CodeMirror.defineMIME("text/x-twig", "twig");
});