// CodeMirror, copyright © by Marijn Haverbeke and others // Distributed under an MIT license: codemirror.net/LICENSE

(function(mod) {

if (typeof exports == "object" && typeof module == "object") // CommonJS
  mod(require("../../lib/codemirror"), require("../xml/xml"), require("../meta"));
else if (typeof define == "function" && define.amd) // AMD
  define(["../../lib/codemirror", "../xml/xml", "../meta"], mod);
else // Plain browser env
  mod(CodeMirror);

})(function(CodeMirror) { “use strict”;

CodeMirror.defineMode(“markdown”, function(cmCfg, modeCfg) {

var htmlMode = CodeMirror.getMode(cmCfg, "text/html");
var htmlModeMissing = htmlMode.name == "null"

function getMode(name) {
  if (CodeMirror.findModeByName) {
    var found = CodeMirror.findModeByName(name);
    if (found) name = found.mime || found.mimes[0];
  }
  var mode = CodeMirror.getMode(cmCfg, name);
  return mode.name == "null" ? null : mode;
}

// Should characters that affect highlighting be highlighted separate?
// Does not include characters that will be output (such as `1.` and `-` for lists)
if (modeCfg.highlightFormatting === undefined)
  modeCfg.highlightFormatting = false;

// Maximum number of nested blockquotes. Set to 0 for infinite nesting.
// Excess `>` will emit `error` token.
if (modeCfg.maxBlockquoteDepth === undefined)
  modeCfg.maxBlockquoteDepth = 0;

// Turn on task lists? ("- [ ] " and "- [x] ")
if (modeCfg.taskLists === undefined) modeCfg.taskLists = false;

// Turn on strikethrough syntax
if (modeCfg.strikethrough === undefined)
  modeCfg.strikethrough = false;

if (modeCfg.emoji === undefined)
  modeCfg.emoji = false;

if (modeCfg.fencedCodeBlockHighlighting === undefined)
  modeCfg.fencedCodeBlockHighlighting = true;

if (modeCfg.xml === undefined)
  modeCfg.xml = true;

// Allow token types to be overridden by user-provided token types.
if (modeCfg.tokenTypeOverrides === undefined)
  modeCfg.tokenTypeOverrides = {};

var tokenTypes = {
  header: "header",
  code: "comment",
  quote: "quote",
  list1: "variable-2",
  list2: "variable-3",
  list3: "keyword",
  hr: "hr",
  image: "image",
  imageAltText: "image-alt-text",
  imageMarker: "image-marker",
  formatting: "formatting",
  linkInline: "link",
  linkEmail: "link",
  linkText: "link",
  linkHref: "string",
  em: "em",
  strong: "strong",
  strikethrough: "strikethrough",
  emoji: "builtin"
};

for (var tokenType in tokenTypes) {
  if (tokenTypes.hasOwnProperty(tokenType) && modeCfg.tokenTypeOverrides[tokenType]) {
    tokenTypes[tokenType] = modeCfg.tokenTypeOverrides[tokenType];
  }
}

var hrRE = /^([*\-_])(?:\s*\1){2,}\s*$/
,   listRE = /^(?:[*\-+]|^[0-9]+([.)]))\s+/
,   taskListRE = /^\[(x| )\](?=\s)/ // Must follow listRE
,   atxHeaderRE = modeCfg.allowAtxHeaderWithoutSpace ? /^(#+)/ : /^(#+)(?: |$)/
,   setextHeaderRE = /^ *(?:\={1,}|-{1,})\s*$/
,   textRE = /^[^#!\[\]*_\\<>` "'(~:]+/
,   fencedCodeRE = /^(~~~+|```+)[ \t]*([\w+#-]*)[^\n`]*$/
,   linkDefRE = /^\s*\[[^\]]+?\]:\s*\S+(\s*\S*\s*)?$/ // naive link-definition
,   punctuation = /[!\"#$%&\'()*+,\-\.\/:;<=>?@\[\\\]^_`{|}~—]/
,   expandedTab = "    " // CommonMark specifies tab as 4 spaces

function switchInline(stream, state, f) {
  state.f = state.inline = f;
  return f(stream, state);
}

function switchBlock(stream, state, f) {
  state.f = state.block = f;
  return f(stream, state);
}

function lineIsEmpty(line) {
  return !line || !/\S/.test(line.string)
}

// Blocks

function blankLine(state) {
  // Reset linkTitle state
  state.linkTitle = false;
  // Reset EM state
  state.em = false;
  // Reset STRONG state
  state.strong = false;
  // Reset strikethrough state
  state.strikethrough = false;
  // Reset state.quote
  state.quote = 0;
  // Reset state.indentedCode
  state.indentedCode = false;
  if (state.f == htmlBlock) {
    state.f = inlineNormal;
    state.block = blockNormal;
  }
  // Reset state.trailingSpace
  state.trailingSpace = 0;
  state.trailingSpaceNewLine = false;
  // Mark this line as blank
  state.prevLine = state.thisLine
  state.thisLine = {stream: null}
  return null;
}

function blockNormal(stream, state) {
  var firstTokenOnLine = stream.column() === state.indentation;
  var prevLineLineIsEmpty = lineIsEmpty(state.prevLine.stream);
  var prevLineIsIndentedCode = state.indentedCode;
  var prevLineIsHr = state.prevLine.hr;
  var prevLineIsList = state.list !== false;
  var maxNonCodeIndentation = (state.listStack[state.listStack.length - 1] || 0) + 3;

  state.indentedCode = false;

  var lineIndentation = state.indentation;
  // compute once per line (on first token)
  if (state.indentationDiff === null) {
    state.indentationDiff = state.indentation;
    if (prevLineIsList) {
      state.list = null;
      // While this list item's marker's indentation is less than the deepest
      //  list item's content's indentation,pop the deepest list item
      //  indentation off the stack, and update block indentation state
      while (lineIndentation < state.listStack[state.listStack.length - 1]) {
        state.listStack.pop();
        if (state.listStack.length) {
          state.indentation = state.listStack[state.listStack.length - 1];
        // less than the first list's indent -> the line is no longer a list
        } else {
          state.list = false;
        }
      }
      if (state.list !== false) {
        state.indentationDiff = lineIndentation - state.listStack[state.listStack.length - 1]
      }
    }
  }

  // not comprehensive (currently only for setext detection purposes)
  var allowsInlineContinuation = (
      !prevLineLineIsEmpty && !prevLineIsHr && !state.prevLine.header &&
      (!prevLineIsList || !prevLineIsIndentedCode) &&
      !state.prevLine.fencedCodeEnd
  );

  var isHr = (state.list === false || prevLineIsHr || prevLineLineIsEmpty) &&
    state.indentation <= maxNonCodeIndentation && stream.match(hrRE);

  var match = null;
  if (state.indentationDiff >= 4 && (prevLineIsIndentedCode || state.prevLine.fencedCodeEnd ||
       state.prevLine.header || prevLineLineIsEmpty)) {
    stream.skipToEnd();
    state.indentedCode = true;
    return tokenTypes.code;
  } else if (stream.eatSpace()) {
    return null;
  } else if (firstTokenOnLine && state.indentation <= maxNonCodeIndentation && (match = stream.match(atxHeaderRE)) && match[1].length <= 6) {
    state.quote = 0;
    state.header = match[1].length;
    state.thisLine.header = true;
    if (modeCfg.highlightFormatting) state.formatting = "header";
    state.f = state.inline;
    return getType(state);
  } else if (state.indentation <= maxNonCodeIndentation && stream.eat('>')) {
    state.quote = firstTokenOnLine ? 1 : state.quote + 1;
    if (modeCfg.highlightFormatting) state.formatting = "quote";
    stream.eatSpace();
    return getType(state);
  } else if (!isHr && !state.setext && firstTokenOnLine && state.indentation <= maxNonCodeIndentation && (match = stream.match(listRE))) {
    var listType = match[1] ? "ol" : "ul";

    state.indentation = lineIndentation + stream.current().length;
    state.list = true;
    state.quote = 0;

    // Add this list item's content's indentation to the stack
    state.listStack.push(state.indentation);

    if (modeCfg.taskLists && stream.match(taskListRE, false)) {
      state.taskList = true;
    }
    state.f = state.inline;
    if (modeCfg.highlightFormatting) state.formatting = ["list", "list-" + listType];
    return getType(state);
  } else if (firstTokenOnLine && state.indentation <= maxNonCodeIndentation && (match = stream.match(fencedCodeRE, true))) {
    state.quote = 0;
    state.fencedEndRE = new RegExp(match[1] + "+ *$");
    // try switching mode
    state.localMode = modeCfg.fencedCodeBlockHighlighting && getMode(match[2]);
    if (state.localMode) state.localState = CodeMirror.startState(state.localMode);
    state.f = state.block = local;
    if (modeCfg.highlightFormatting) state.formatting = "code-block";
    state.code = -1
    return getType(state);
  // SETEXT has lowest block-scope precedence after HR, so check it after
  //  the others (code, blockquote, list...)
  } else if (
    // if setext set, indicates line after ---/===
    state.setext || (
      // line before ---/===
      (!allowsInlineContinuation || !prevLineIsList) && !state.quote && state.list === false &&
      !state.code && !isHr && !linkDefRE.test(stream.string) &&
      (match = stream.lookAhead(1)) && (match = match.match(setextHeaderRE))
    )
  ) {
    if ( !state.setext ) {
      state.header = match[0].charAt(0) == '=' ? 1 : 2;
      state.setext = state.header;
    } else {
      state.header = state.setext;
      // has no effect on type so we can reset it now
      state.setext = 0;
      stream.skipToEnd();
      if (modeCfg.highlightFormatting) state.formatting = "header";
    }
    state.thisLine.header = true;
    state.f = state.inline;
    return getType(state);
  } else if (isHr) {
    stream.skipToEnd();
    state.hr = true;
    state.thisLine.hr = true;
    return tokenTypes.hr;
  } else if (stream.peek() === '[') {
    return switchInline(stream, state, footnoteLink);
  }

  return switchInline(stream, state, state.inline);
}

function htmlBlock(stream, state) {
  var style = htmlMode.token(stream, state.htmlState);
  if (!htmlModeMissing) {
    var inner = CodeMirror.innerMode(htmlMode, state.htmlState)
    if ((inner.mode.name == "xml" && inner.state.tagStart === null &&
         (!inner.state.context && inner.state.tokenize.isInText)) ||
        (state.md_inside && stream.current().indexOf(">") > -1)) {
      state.f = inlineNormal;
      state.block = blockNormal;
      state.htmlState = null;
    }
  }
  return style;
}

function local(stream, state) {
  var currListInd = state.listStack[state.listStack.length - 1] || 0;
  var hasExitedList = state.indentation < currListInd;
  var maxFencedEndInd = currListInd + 3;
  if (state.fencedEndRE && state.indentation <= maxFencedEndInd && (hasExitedList || stream.match(state.fencedEndRE))) {
    if (modeCfg.highlightFormatting) state.formatting = "code-block";
    var returnType;
    if (!hasExitedList) returnType = getType(state)
    state.localMode = state.localState = null;
    state.block = blockNormal;
    state.f = inlineNormal;
    state.fencedEndRE = null;
    state.code = 0
    state.thisLine.fencedCodeEnd = true;
    if (hasExitedList) return switchBlock(stream, state, state.block);
    return returnType;
  } else if (state.localMode) {
    return state.localMode.token(stream, state.localState);
  } else {
    stream.skipToEnd();
    return tokenTypes.code;
  }
}

// Inline
function getType(state) {
  var styles = [];

  if (state.formatting) {
    styles.push(tokenTypes.formatting);

    if (typeof state.formatting === "string") state.formatting = [state.formatting];

    for (var i = 0; i < state.formatting.length; i++) {
      styles.push(tokenTypes.formatting + "-" + state.formatting[i]);

      if (state.formatting[i] === "header") {
        styles.push(tokenTypes.formatting + "-" + state.formatting[i] + "-" + state.header);
      }

      // Add `formatting-quote` and `formatting-quote-#` for blockquotes
      // Add `error` instead if the maximum blockquote nesting depth is passed
      if (state.formatting[i] === "quote") {
        if (!modeCfg.maxBlockquoteDepth || modeCfg.maxBlockquoteDepth >= state.quote) {
          styles.push(tokenTypes.formatting + "-" + state.formatting[i] + "-" + state.quote);
        } else {
          styles.push("error");
        }
      }
    }
  }

  if (state.taskOpen) {
    styles.push("meta");
    return styles.length ? styles.join(' ') : null;
  }
  if (state.taskClosed) {
    styles.push("property");
    return styles.length ? styles.join(' ') : null;
  }

  if (state.linkHref) {
    styles.push(tokenTypes.linkHref, "url");
  } else { // Only apply inline styles to non-url text
    if (state.strong) { styles.push(tokenTypes.strong); }
    if (state.em) { styles.push(tokenTypes.em); }
    if (state.strikethrough) { styles.push(tokenTypes.strikethrough); }
    if (state.emoji) { styles.push(tokenTypes.emoji); }
    if (state.linkText) { styles.push(tokenTypes.linkText); }
    if (state.code) { styles.push(tokenTypes.code); }
    if (state.image) { styles.push(tokenTypes.image); }
    if (state.imageAltText) { styles.push(tokenTypes.imageAltText, "link"); }
    if (state.imageMarker) { styles.push(tokenTypes.imageMarker); }
  }

  if (state.header) { styles.push(tokenTypes.header, tokenTypes.header + "-" + state.header); }

  if (state.quote) {
    styles.push(tokenTypes.quote);

    // Add `quote-#` where the maximum for `#` is modeCfg.maxBlockquoteDepth
    if (!modeCfg.maxBlockquoteDepth || modeCfg.maxBlockquoteDepth >= state.quote) {
      styles.push(tokenTypes.quote + "-" + state.quote);
    } else {
      styles.push(tokenTypes.quote + "-" + modeCfg.maxBlockquoteDepth);
    }
  }

  if (state.list !== false) {
    var listMod = (state.listStack.length - 1) % 3;
    if (!listMod) {
      styles.push(tokenTypes.list1);
    } else if (listMod === 1) {
      styles.push(tokenTypes.list2);
    } else {
      styles.push(tokenTypes.list3);
    }
  }

  if (state.trailingSpaceNewLine) {
    styles.push("trailing-space-new-line");
  } else if (state.trailingSpace) {
    styles.push("trailing-space-" + (state.trailingSpace % 2 ? "a" : "b"));
  }

  return styles.length ? styles.join(' ') : null;
}

function handleText(stream, state) {
  if (stream.match(textRE, true)) {
    return getType(state);
  }
  return undefined;
}

function inlineNormal(stream, state) {
  var style = state.text(stream, state);
  if (typeof style !== 'undefined')
    return style;

  if (state.list) { // List marker (*, +, -, 1., etc)
    state.list = null;
    return getType(state);
  }

  if (state.taskList) {
    var taskOpen = stream.match(taskListRE, true)[1] !== "x";
    if (taskOpen) state.taskOpen = true;
    else state.taskClosed = true;
    if (modeCfg.highlightFormatting) state.formatting = "task";
    state.taskList = false;
    return getType(state);
  }

  state.taskOpen = false;
  state.taskClosed = false;

  if (state.header && stream.match(/^#+$/, true)) {
    if (modeCfg.highlightFormatting) state.formatting = "header";
    return getType(state);
  }

  var ch = stream.next();

  // Matches link titles present on next line
  if (state.linkTitle) {
    state.linkTitle = false;
    var matchCh = ch;
    if (ch === '(') {
      matchCh = ')';
    }
    matchCh = (matchCh+'').replace(/([.?*+^\[\]\\(){}|-])/g, "\\$1");
    var regex = '^\\s*(?:[^' + matchCh + '\\\\]+|\\\\\\\\|\\\\.)' + matchCh;
    if (stream.match(new RegExp(regex), true)) {
      return tokenTypes.linkHref;
    }
  }

  // If this block is changed, it may need to be updated in GFM mode
  if (ch === '`') {
    var previousFormatting = state.formatting;
    if (modeCfg.highlightFormatting) state.formatting = "code";
    stream.eatWhile('`');
    var count = stream.current().length
    if (state.code == 0 && (!state.quote || count == 1)) {
      state.code = count
      return getType(state)
    } else if (count == state.code) { // Must be exact
      var t = getType(state)
      state.code = 0
      return t
    } else {
      state.formatting = previousFormatting
      return getType(state)
    }
  } else if (state.code) {
    return getType(state);
  }

  if (ch === '\\') {
    stream.next();
    if (modeCfg.highlightFormatting) {
      var type = getType(state);
      var formattingEscape = tokenTypes.formatting + "-escape";
      return type ? type + " " + formattingEscape : formattingEscape;
    }
  }

  if (ch === '!' && stream.match(/\[[^\]]*\] ?(?:\(|\[)/, false)) {
    state.imageMarker = true;
    state.image = true;
    if (modeCfg.highlightFormatting) state.formatting = "image";
    return getType(state);
  }

  if (ch === '[' && state.imageMarker && stream.match(/[^\]]*\](\(.*?\)| ?\[.*?\])/, false)) {
    state.imageMarker = false;
    state.imageAltText = true
    if (modeCfg.highlightFormatting) state.formatting = "image";
    return getType(state);
  }

  if (ch === ']' && state.imageAltText) {
    if (modeCfg.highlightFormatting) state.formatting = "image";
    var type = getType(state);
    state.imageAltText = false;
    state.image = false;
    state.inline = state.f = linkHref;
    return type;
  }

  if (ch === '[' && !state.image) {
    state.linkText = true;
    if (modeCfg.highlightFormatting) state.formatting = "link";
    return getType(state);
  }

  if (ch === ']' && state.linkText) {
    if (modeCfg.highlightFormatting) state.formatting = "link";
    var type = getType(state);
    state.linkText = false;
    state.inline = state.f = stream.match(/\(.*?\)| ?\[.*?\]/, false) ? linkHref : inlineNormal
    return type;
  }

  if (ch === '<' && stream.match(/^(https?|ftps?):\/\/(?:[^\\>]|\\.)+>/, false)) {
    state.f = state.inline = linkInline;
    if (modeCfg.highlightFormatting) state.formatting = "link";
    var type = getType(state);
    if (type){
      type += " ";
    } else {
      type = "";
    }
    return type + tokenTypes.linkInline;
  }

  if (ch === '<' && stream.match(/^[^> \\]+@(?:[^\\>]|\\.)+>/, false)) {
    state.f = state.inline = linkInline;
    if (modeCfg.highlightFormatting) state.formatting = "link";
    var type = getType(state);
    if (type){
      type += " ";
    } else {
      type = "";
    }
    return type + tokenTypes.linkEmail;
  }

  if (modeCfg.xml && ch === '<' && stream.match(/^(!--|[a-z]+(?:\s+[a-z_:.\-]+(?:\s*=\s*[^ >]+)?)*\s*>)/i, false)) {
    var end = stream.string.indexOf(">", stream.pos);
    if (end != -1) {
      var atts = stream.string.substring(stream.start, end);
      if (/markdown\s*=\s*('|"){0,1}1('|"){0,1}/.test(atts)) state.md_inside = true;
    }
    stream.backUp(1);
    state.htmlState = CodeMirror.startState(htmlMode);
    return switchBlock(stream, state, htmlBlock);
  }

  if (modeCfg.xml && ch === '<' && stream.match(/^\/\w*?>/)) {
    state.md_inside = false;
    return "tag";
  } else if (ch === "*" || ch === "_") {
    var len = 1, before = stream.pos == 1 ? " " : stream.string.charAt(stream.pos - 2)
    while (len < 3 && stream.eat(ch)) len++
    var after = stream.peek() || " "
    // See http://spec.commonmark.org/0.27/#emphasis-and-strong-emphasis
    var leftFlanking = !/\s/.test(after) && (!punctuation.test(after) || /\s/.test(before) || punctuation.test(before))
    var rightFlanking = !/\s/.test(before) && (!punctuation.test(before) || /\s/.test(after) || punctuation.test(after))
    var setEm = null, setStrong = null
    if (len % 2) { // Em
      if (!state.em && leftFlanking && (ch === "*" || !rightFlanking || punctuation.test(before)))
        setEm = true
      else if (state.em == ch && rightFlanking && (ch === "*" || !leftFlanking || punctuation.test(after)))
        setEm = false
    }
    if (len > 1) { // Strong
      if (!state.strong && leftFlanking && (ch === "*" || !rightFlanking || punctuation.test(before)))
        setStrong = true
      else if (state.strong == ch && rightFlanking && (ch === "*" || !leftFlanking || punctuation.test(after)))
        setStrong = false
    }
    if (setStrong != null || setEm != null) {
      if (modeCfg.highlightFormatting) state.formatting = setEm == null ? "strong" : setStrong == null ? "em" : "strong em"
      if (setEm === true) state.em = ch
      if (setStrong === true) state.strong = ch
      var t = getType(state)
      if (setEm === false) state.em = false
      if (setStrong === false) state.strong = false
      return t
    }
  } else if (ch === ' ') {
    if (stream.eat('*') || stream.eat('_')) { // Probably surrounded by spaces
      if (stream.peek() === ' ') { // Surrounded by spaces, ignore
        return getType(state);
      } else { // Not surrounded by spaces, back up pointer
        stream.backUp(1);
      }
    }
  }

  if (modeCfg.strikethrough) {
    if (ch === '~' && stream.eatWhile(ch)) {
      if (state.strikethrough) {// Remove strikethrough
        if (modeCfg.highlightFormatting) state.formatting = "strikethrough";
        var t = getType(state);
        state.strikethrough = false;
        return t;
      } else if (stream.match(/^[^\s]/, false)) {// Add strikethrough
        state.strikethrough = true;
        if (modeCfg.highlightFormatting) state.formatting = "strikethrough";
        return getType(state);
      }
    } else if (ch === ' ') {
      if (stream.match(/^~~/, true)) { // Probably surrounded by space
        if (stream.peek() === ' ') { // Surrounded by spaces, ignore
          return getType(state);
        } else { // Not surrounded by spaces, back up pointer
          stream.backUp(2);
        }
      }
    }
  }

  if (modeCfg.emoji && ch === ":" && stream.match(/^[a-z_\d+-]+:/)) {
    state.emoji = true;
    if (modeCfg.highlightFormatting) state.formatting = "emoji";
    var retType = getType(state);
    state.emoji = false;
    return retType;
  }

  if (ch === ' ') {
    if (stream.match(/ +$/, false)) {
      state.trailingSpace++;
    } else if (state.trailingSpace) {
      state.trailingSpaceNewLine = true;
    }
  }

  return getType(state);
}

function linkInline(stream, state) {
  var ch = stream.next();

  if (ch === ">") {
    state.f = state.inline = inlineNormal;
    if (modeCfg.highlightFormatting) state.formatting = "link";
    var type = getType(state);
    if (type){
      type += " ";
    } else {
      type = "";
    }
    return type + tokenTypes.linkInline;
  }

  stream.match(/^[^>]+/, true);

  return tokenTypes.linkInline;
}

function linkHref(stream, state) {
  // Check if space, and return NULL if so (to avoid marking the space)
  if(stream.eatSpace()){
    return null;
  }
  var ch = stream.next();
  if (ch === '(' || ch === '[') {
    state.f = state.inline = getLinkHrefInside(ch === "(" ? ")" : "]");
    if (modeCfg.highlightFormatting) state.formatting = "link-string";
    state.linkHref = true;
    return getType(state);
  }
  return 'error';
}

var linkRE = {
  ")": /^(?:[^\\\(\)]|\\.|\((?:[^\\\(\)]|\\.)*\))*?(?=\))/,
  "]": /^(?:[^\\\[\]]|\\.|\[(?:[^\\\[\]]|\\.)*\])*?(?=\])/
}

function getLinkHrefInside(endChar) {
  return function(stream, state) {
    var ch = stream.next();

    if (ch === endChar) {
      state.f = state.inline = inlineNormal;
      if (modeCfg.highlightFormatting) state.formatting = "link-string";
      var returnState = getType(state);
      state.linkHref = false;
      return returnState;
    }

    stream.match(linkRE[endChar])
    state.linkHref = true;
    return getType(state);
  };
}

function footnoteLink(stream, state) {
  if (stream.match(/^([^\]\\]|\\.)*\]:/, false)) {
    state.f = footnoteLinkInside;
    stream.next(); // Consume [
    if (modeCfg.highlightFormatting) state.formatting = "link";
    state.linkText = true;
    return getType(state);
  }
  return switchInline(stream, state, inlineNormal);
}

function footnoteLinkInside(stream, state) {
  if (stream.match(/^\]:/, true)) {
    state.f = state.inline = footnoteUrl;
    if (modeCfg.highlightFormatting) state.formatting = "link";
    var returnType = getType(state);
    state.linkText = false;
    return returnType;
  }

  stream.match(/^([^\]\\]|\\.)+/, true);

  return tokenTypes.linkText;
}

function footnoteUrl(stream, state) {
  // Check if space, and return NULL if so (to avoid marking the space)
  if(stream.eatSpace()){
    return null;
  }
  // Match URL
  stream.match(/^[^\s]+/, true);
  // Check for link title
  if (stream.peek() === undefined) { // End of line, set flag to check next line
    state.linkTitle = true;
  } else { // More content on line, check if link title
    stream.match(/^(?:\s+(?:"(?:[^"\\]|\\\\|\\.)+"|'(?:[^'\\]|\\\\|\\.)+'|\((?:[^)\\]|\\\\|\\.)+\)))?/, true);
  }
  state.f = state.inline = inlineNormal;
  return tokenTypes.linkHref + " url";
}

var mode = {
  startState: function() {
    return {
      f: blockNormal,

      prevLine: {stream: null},
      thisLine: {stream: null},

      block: blockNormal,
      htmlState: null,
      indentation: 0,

      inline: inlineNormal,
      text: handleText,

      formatting: false,
      linkText: false,
      linkHref: false,
      linkTitle: false,
      code: 0,
      em: false,
      strong: false,
      header: 0,
      setext: 0,
      hr: false,
      taskList: false,
      list: false,
      listStack: [],
      quote: 0,
      trailingSpace: 0,
      trailingSpaceNewLine: false,
      strikethrough: false,
      emoji: false,
      fencedEndRE: null
    };
  },

  copyState: function(s) {
    return {
      f: s.f,

      prevLine: s.prevLine,
      thisLine: s.thisLine,

      block: s.block,
      htmlState: s.htmlState && CodeMirror.copyState(htmlMode, s.htmlState),
      indentation: s.indentation,

      localMode: s.localMode,
      localState: s.localMode ? CodeMirror.copyState(s.localMode, s.localState) : null,

      inline: s.inline,
      text: s.text,
      formatting: false,
      linkText: s.linkText,
      linkTitle: s.linkTitle,
      code: s.code,
      em: s.em,
      strong: s.strong,
      strikethrough: s.strikethrough,
      emoji: s.emoji,
      header: s.header,
      setext: s.setext,
      hr: s.hr,
      taskList: s.taskList,
      list: s.list,
      listStack: s.listStack.slice(0),
      quote: s.quote,
      indentedCode: s.indentedCode,
      trailingSpace: s.trailingSpace,
      trailingSpaceNewLine: s.trailingSpaceNewLine,
      md_inside: s.md_inside,
      fencedEndRE: s.fencedEndRE
    };
  },

  token: function(stream, state) {

    // Reset state.formatting
    state.formatting = false;

    if (stream != state.thisLine.stream) {
      state.header = 0;
      state.hr = false;

      if (stream.match(/^\s*$/, true)) {
        blankLine(state);
        return null;
      }

      state.prevLine = state.thisLine
      state.thisLine = {stream: stream}

      // Reset state.taskList
      state.taskList = false;

      // Reset state.trailingSpace
      state.trailingSpace = 0;
      state.trailingSpaceNewLine = false;

      state.f = state.block;
      if (state.f != htmlBlock) {
        var indentation = stream.match(/^\s*/, true)[0].replace(/\t/g, expandedTab).length;
        state.indentation = indentation;
        state.indentationDiff = null;
        if (indentation > 0) return null;
      }
    }
    return state.f(stream, state);
  },

  innerMode: function(state) {
    if (state.block == htmlBlock) return {state: state.htmlState, mode: htmlMode};
    if (state.localState) return {state: state.localState, mode: state.localMode};
    return {state: state, mode: mode};
  },

  indent: function(state, textAfter, line) {
    if (state.block == htmlBlock) return htmlMode.indent(state.htmlState, textAfter, line)
    if (state.localState) return state.localMode.indent(state.localState, textAfter, line)
    return CodeMirror.Pass
  },

  blankLine: blankLine,

  getType: getType,

  closeBrackets: "()[]{}''\"\"``",
  fold: "markdown"
};
return mode;

}, “xml”);

CodeMirror.defineMIME(“text/x-markdown”, “markdown”);

});