(function() {
  function keywords(str) {
    var obj = {}, words = str.split(" ");
    for (var i = 0; i < words.length; ++i) obj[words[i]] = true;
    return obj;
  }
  function heredoc(delim) {
    return function(stream, state) {
      if (stream.match(delim)) state.tokenize = null;
      else stream.skipToEnd();
      return "string";
    }
  }
  var phpConfig = {
    name: "clike",
    keywords: keywords("abstract and array as break case catch class clone const continue declare default " +
                       "do else elseif enddeclare endfor endforeach endif endswitch endwhile extends final " +
                       "for foreach function global goto if implements interface instanceof namespace " +
                       "new or private protected public static switch throw trait try use var while xor " +
                       "die echo empty exit eval include include_once isset list require require_once return " +
                       "print unset __halt_compiler self static parent"),
    blockKeywords: keywords("catch do else elseif for foreach if switch try while"),
    atoms: keywords("true false null TRUE FALSE NULL"),
    multiLineStrings: true,
    hooks: {
      "$": function(stream, state) {
        stream.eatWhile(/[\w\$_]/);
        return "variable-2";
      },
      "<": function(stream, state) {
        if (stream.match(/<</)) {
          stream.eatWhile(/[\w\.]/);
          state.tokenize = heredoc(stream.current().slice(3));
          return state.tokenize(stream, state);
        }
        return false;
      },
      "#": function(stream, state) {
        while (!stream.eol() && !stream.match("?>", false)) stream.next();
        return "comment";
      },
      "/": function(stream, state) {
        if (stream.eat("/")) {
          while (!stream.eol() && !stream.match("?>", false)) stream.next();
          return "comment";
        }
        return false;
      }
    }
  };

  CodeMirror.defineMode("php", function(config, parserConfig) {
    var htmlMode = CodeMirror.getMode(config, {name: "xml", htmlMode: true});
    var jsMode = CodeMirror.getMode(config, "javascript");
    var cssMode = CodeMirror.getMode(config, "css");
    var phpMode = CodeMirror.getMode(config, phpConfig);

    function dispatch(stream, state) { // TODO open PHP inside text/css
      var isPHP = state.mode == "php";
      if (stream.sol() && state.pending != '"') state.pending = null;
      if (state.curMode == htmlMode) {
        if (stream.match(/^<\?\w*/)) {
          state.curMode = phpMode;
          state.curState = state.php;
          state.curClose = "?>";
	  state.mode = "php";
          return "meta";
        }
        if (state.pending == '"') {
          while (!stream.eol() && stream.next() != '"') {}
          var style = "string";
        } else if (state.pending && stream.pos < state.pending.end) {
          stream.pos = state.pending.end;
          var style = state.pending.style;
        } else {
          var style = htmlMode.token(stream, state.curState);
        }
        state.pending = null;
        var cur = stream.current(), openPHP = cur.search(/<\?/);
        if (openPHP != -1) {
          if (style == "string" && /\"$/.test(cur) && !/\?>/.test(cur)) state.pending = '"';
          else state.pending = {end: stream.pos, style: style};
          stream.backUp(cur.length - openPHP);
        } else if (style == "tag" && stream.current() == ">" && state.curState.context) {
          if (/^script$/i.test(state.curState.context.tagName)) {
            state.curMode = jsMode;
            state.curState = jsMode.startState(htmlMode.indent(state.curState, ""));
            state.curClose = /^<\/\s*script\s*>/i;
	    state.mode = "javascript";
          }
          else if (/^style$/i.test(state.curState.context.tagName)) {
            state.curMode = cssMode;
            state.curState = cssMode.startState(htmlMode.indent(state.curState, ""));
            state.curClose = /^<\/\s*style\s*>/i;
            state.mode = "css";
          }
        }
        return style;
      } else if ((!isPHP || state.php.tokenize == null) &&
                 stream.match(state.curClose, isPHP)) {
        state.curMode = htmlMode;
        state.curState = state.html;
        state.curClose = null;
	state.mode = "html";
        if (isPHP) return "meta";
        else return dispatch(stream, state);
      } else {
        return state.curMode.token(stream, state.curState);
      }
    }

    return {
      startState: function() {
        var html = htmlMode.startState();
        return {html: html,
                php: phpMode.startState(),
                curMode: parserConfig.startOpen ? phpMode : htmlMode,
                curState: parserConfig.startOpen ? phpMode.startState() : html,
                curClose: parserConfig.startOpen ? /^\?>/ : null,
		mode: parserConfig.startOpen ? "php" : "html",
                pending: null}
      },

      copyState: function(state) {
        var html = state.html, htmlNew = CodeMirror.copyState(htmlMode, html),
            php = state.php, phpNew = CodeMirror.copyState(phpMode, php), cur;
        if (state.curState == html) cur = htmlNew;
        else if (state.curState == php) cur = phpNew;
        else cur = CodeMirror.copyState(state.curMode, state.curState);
        return {html: htmlNew, php: phpNew, curMode: state.curMode, curState: cur,
                curClose: state.curClose, mode: state.mode,
                pending: state.pending};
      },

      token: dispatch,

      indent: function(state, textAfter) {
        if ((state.curMode != phpMode && /^\s*<\//.test(textAfter)) ||
            (state.curMode == phpMode && /^\?>/.test(textAfter)))
          return htmlMode.indent(state.html, textAfter);
        return state.curMode.indent(state.curState, textAfter);
      },

      electricChars: "/{}:"
    }
  }, "xml", "clike", "javascript", "css");
  CodeMirror.defineMIME("application/x-httpd-php", "php");
  CodeMirror.defineMIME("application/x-httpd-php-open", {name: "php", startOpen: true});
  CodeMirror.defineMIME("text/x-php", phpConfig);
})();
