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

    CodeMirror.runMode = function (string, modespec, callback, options) {
        var mode = CodeMirror.getMode(CodeMirror.defaults, modespec);
        var ie = /MSIE \d/.test(navigator.userAgent);
        var ie_lt9 = ie && (document.documentMode == null || document.documentMode < 9);

        if (callback.appendChild) {
            var tabSize = (options && options.tabSize) || CodeMirror.defaults.tabSize;
            var node = callback,
                col = 0;
            node.innerHTML = "";
            callback = function (text, style) {
                if (text == "\n") {
                    // Emitting LF or CRLF on IE8 or earlier results in an incorrect display.
                    // Emitting a carriage return makes everything ok.
                    node.appendChild(document.createTextNode(ie_lt9 ? "\r" : text));
                    col = 0;
                    return;
                }
                var content = "";
                // replace tabs
                for (var pos = 0; ; ) {
                    var idx = text.indexOf("\t", pos);
                    if (idx == -1) {
                        content += text.slice(pos);
                        col += text.length - pos;
                        break;
                    } else {
                        col += idx - pos;
                        content += text.slice(pos, idx);
                        var size = tabSize - (col % tabSize);
                        col += size;
                        for (var i = 0; i < size; ++i) content += " ";
                        pos = idx + 1;
                    }
                }

                if (style) {
                    var sp = node.appendChild(document.createElement("span"));
                    sp.className = "cm-" + style.replace(/ +/g, " cm-");
                    sp.appendChild(document.createTextNode(content));
                } else {
                    node.appendChild(document.createTextNode(content));
                }
            };
        }

        var lines = CodeMirror.splitLines(string),
            state = (options && options.state) || CodeMirror.startState(mode);
        for (var i = 0, e = lines.length; i < e; ++i) {
            if (i) callback("\n");
            var stream = new CodeMirror.StringStream(lines[i]);
            if (!stream.string && mode.blankLine) mode.blankLine(state);
            while (!stream.eol()) {
                var style = mode.token(stream, state);
                callback(stream.current(), style, i, stream.start, state);
                stream.start = stream.pos;
            }
        }
    };
});
