Update to use modified editor markdown mode to make mathjax expression display correctly

1 files changed, 864 insertions, 0 deletions

diff --git a/public/vendor/codemirror/mode/markdown/markdown_math.js b/public/vendor/codemirror/mode/markdown/markdown_math.js
new file mode 100644
index 00000000..e46adb79
--- /dev/null
+++ b/public/vendor/codemirror/mode/markdown/markdown_math.js
@@ -0,0 +1,864 @@
+// 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("../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;
+
+  // Should underscores in words open/close em/strong?
+  if (modeCfg.underscoresBreakWords === undefined)
+    modeCfg.underscoresBreakWords = true;
+
+  // Use `fencedCodeBlocks` to configure fenced code blocks. false to
+  // disable, string to specify a precise regexp that the fence should
+  // match, and true to allow three or more backticks or tildes (as
+  // per CommonMark).
+
+  // Turn on task lists? ("- [ ] " and "- [x] ")
+  if (modeCfg.taskLists === undefined) modeCfg.taskLists = false;
+
+  // Turn on strikethrough syntax
+  if (modeCfg.strikethrough === undefined)
+    modeCfg.strikethrough = false;
+
+  // Allow token types to be overridden by user-provided token types.
+  if (modeCfg.tokenTypeOverrides === undefined)
+    modeCfg.tokenTypeOverrides = {};
+
+  var tokenTypes = {
+    header: "header",
+    code: "comment",
+    math: "math",
+    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"
+  };
+
+  for (var tokenType in tokenTypes) {
+    if (tokenTypes.hasOwnProperty(tokenType) && modeCfg.tokenTypeOverrides[tokenType]) {
+      tokenTypes[tokenType] = modeCfg.tokenTypeOverrides[tokenType];
+    }
+  }
+
+  var hrRE = /^([*\-_])(?:\s*\1){2,}\s*$/
+  ,   ulRE = /^[*\-+]\s+/
+  ,   olRE = /^[0-9]+([.)])\s+/
+  ,   taskListRE = /^\[(x| )\](?=\s)/ // Must follow ulRE or olRE
+  ,   atxHeaderRE = modeCfg.allowAtxHeaderWithoutSpace ? /^(#+)/ : /^(#+)(?: |$)/
+  ,   setextHeaderRE = /^ *(?:\={1,}|-{1,})\s*$/
+  ,   textRE = /^[^#!\[\]*_\\<>\$` "'(~]+/
+  ,   fencedCodeRE = new RegExp("^(" + (modeCfg.fencedCodeBlocks === true ? "~~~+|```+" : modeCfg.fencedCodeBlocks) +
+                                ")[ \\t]*([\\w+#\-]*)")
+  ,   fencedMathRE = new RegExp("^(\$\$)[ \\t]*([\\w+#\-]*)");
+
+  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 (htmlModeMissing && 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 = null
+    return null;
+  }
+
+  function blockNormal(stream, state) {
+
+    var sol = stream.sol();
+
+    var prevLineIsList = state.list !== false,
+        prevLineIsIndentedCode = state.indentedCode;
+
+    state.indentedCode = false;
+
+    if (prevLineIsList) {
+      if (state.indentationDiff >= 0) { // Continued list
+        if (state.indentationDiff < 4) { // Only adjust indentation if *not* a code block
+          state.indentation -= state.indentationDiff;
+        }
+        state.list = null;
+      } else if (state.indentation > 0) {
+        state.list = null;
+      } else { // No longer a list
+        state.list = false;
+      }
+    }
+
+    var match = null;
+    if (state.indentationDiff >= 4) {
+      stream.skipToEnd();
+      if (prevLineIsIndentedCode || lineIsEmpty(state.prevLine)) {
+        state.indentation -= 4;
+        state.indentedCode = true;
+        return tokenTypes.code;
+      } else {
+        return null;
+      }
+    } else if (stream.eatSpace()) {
+      return null;
+    } else if ((match = stream.match(atxHeaderRE)) && match[1].length <= 6) {
+      state.header = match[1].length;
+      if (modeCfg.highlightFormatting) state.formatting = "header";
+      state.f = state.inline;
+      return getType(state);
+    } else if (!lineIsEmpty(state.prevLine) && !state.quote && !prevLineIsList &&
+               !prevLineIsIndentedCode && (match = stream.match(setextHeaderRE))) {
+      state.header = match[0].charAt(0) == '=' ? 1 : 2;
+      if (modeCfg.highlightFormatting) state.formatting = "header";
+      state.f = state.inline;
+      return getType(state);
+    } else if (stream.eat('>')) {
+      state.quote = sol ? 1 : state.quote + 1;
+      if (modeCfg.highlightFormatting) state.formatting = "quote";
+      stream.eatSpace();
+      return getType(state);
+    } else if (stream.peek() === '[') {
+      return switchInline(stream, state, footnoteLink);
+    } else if (stream.match(hrRE, true)) {
+      state.hr = true;
+      return tokenTypes.hr;
+    } else if ((lineIsEmpty(state.prevLine) || prevLineIsList) && (stream.match(ulRE, false) || stream.match(olRE, false))) {
+      var listType = null;
+      if (stream.match(ulRE, true)) {
+        listType = 'ul';
+      } else {
+        stream.match(olRE, true);
+        listType = 'ol';
+      }
+      state.indentation = stream.column() + stream.current().length;
+      state.list = true;
+
+      // 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.
+      while (state.listStack && stream.column() < state.listStack[state.listStack.length - 1]) {
+        state.listStack.pop();
+      }
+
+      // 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 (modeCfg.fencedCodeBlocks && (match = stream.match(fencedCodeRE, true))) {
+      state.fencedChars = match[1]
+      // try switching mode
+      state.localMode = 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);
+    } else if (match = stream.match(fencedCodeRE, true)) {
+      state.fencedChars = match[1]
+      // try switching mode
+      state.localMode = getMode(match[2]);
+      if (state.localMode) state.localState = CodeMirror.startState(state.localMode);
+      state.f = state.block = local;
+      state.formatting = "math";
+      state.math = -1
+      return getType(state);
+    }
+
+    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) {
+    if (state.fencedChars && stream.match(state.fencedChars, false)) {
+      state.localMode = state.localState = null;
+      state.f = state.block = leavingLocal;
+      return null;
+    } else if (state.localMode) {
+      return state.localMode.token(stream, state.localState);
+    } else {
+      stream.skipToEnd();
+      if (state.math === -1) {
+        return tokenTypes.math;
+      }
+      return tokenTypes.code;
+    }
+  }
+
+  function leavingLocal(stream, state) {
+    stream.match(state.fencedChars);
+    state.block = blockNormal;
+    state.f = inlineNormal;
+    state.fencedChars = null;
+    if (state.math === -1) {
+      state.formatting = "math";
+      state.math = 1
+      var returnType = getType(state);
+      state.math = 0
+      return returnType;
+    }
+    if (modeCfg.highlightFormatting) state.formatting = "code-block";
+    state.code = 1
+    var returnType = getType(state);
+    state.code = 0
+    return returnType;
+  }
+
+  // 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.linkText) { styles.push(tokenTypes.linkText); }
+      if (state.code) { styles.push(tokenTypes.code); }
+      if (state.math) { styles.push(tokenTypes.math); }
+      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(/^#+$/, true)) {
+      if (modeCfg.highlightFormatting) state.formatting = "header";
+      return getType(state);
+    }
+
+    // Get sol() value now, before character is consumed
+    var sol = stream.sol();
+
+    var ch = stream.next();
+
+    // Matches link titles present on next line
+    if (state.linkTitle) {
+      state.linkTitle = false;
+      var matchCh = ch;
+      if (ch === '(') {
+        matchCh = ')';
+      }
+      matchCh = (matchCh+'').replace(/([.?*+^$[\]\\(){}|-])/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.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);
+    }
+
+    // display math correctly
+    if (ch === '$') {
+      var previousFormatting = state.formatting;
+      state.formatting = "math";
+      stream.eatWhile('$');
+      var count = stream.current().length
+      if (state.math == 0) {
+        state.math = count
+        return getType(state)
+      } else if (count == state.math) { // Must be exact
+        var t = getType(state)
+        state.math = 0
+        return t
+      } else {
+        state.formatting = previousFormatting
+        return getType(state)
+      }
+    } else if (state.math) {
+      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(/\[[^\]]*\] ?(?:\(|\[)/, false)) {
+      state.imageMarker = true;
+      state.image = true;
+      if (modeCfg.highlightFormatting) state.formatting = "image";
+      return getType(state);
+    }
+
+    if (ch === '[' && state.imageMarker) {
+      state.imageMarker = false;
+      state.imageAltText = true
+      if (modeCfg.highlightFormatting) state.formatting = "image";
+      return getType(state);
+    }
+
+    if (ch === ']' && state.imageAltText) {
+      if (modeCfg.highlightFormatting) state.formatting = "image";
+      var type = getType(state);
+      state.imageAltText = false;
+      state.image = false;
+      state.inline = state.f = linkHref;
+      return type;
+    }
+
+    if (ch === '[' && stream.match(/[^\]]*\](\(.*\)| ?\[.*?\])/, false) && !state.image) {
+      state.linkText = true;
+      if (modeCfg.highlightFormatting) state.formatting = "link";
+      return getType(state);
+    }
+
+    if (ch === ']' && state.linkText && stream.match(/\(.*?\)| ?\[.*?\]/, false)) {
+      if (modeCfg.highlightFormatting) state.formatting = "link";
+      var type = getType(state);
+      state.linkText = false;
+      state.inline = state.f = linkHref;
+      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 (ch === '<' && stream.match(/^(!--|\w)/, 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 (ch === '<' && stream.match(/^\/\w*?>/)) {
+      state.md_inside = false;
+      return "tag";
+    }
+
+    var ignoreUnderscore = false;
+    if (!modeCfg.underscoresBreakWords) {
+      if (ch === '_' && stream.peek() !== '_' && stream.match(/(\w)/, false)) {
+        var prevPos = stream.pos - 2;
+        if (prevPos >= 0) {
+          var prevCh = stream.string.charAt(prevPos);
+          if (prevCh !== '_' && prevCh.match(/(\w)/, false)) {
+            ignoreUnderscore = true;
+          }
+        }
+      }
+    }
+    if (ch === '*' || (ch === '_' && !ignoreUnderscore)) {
+      if (sol && stream.peek() === ' ') {
+        // Do nothing, surrounded by newline and space
+      } else if (state.strong === ch && stream.eat(ch)) { // Remove STRONG
+        if (modeCfg.highlightFormatting) state.formatting = "strong";
+        var t = getType(state);
+        state.strong = false;
+        return t;
+      } else if (!state.strong && stream.eat(ch)) { // Add STRONG
+        state.strong = ch;
+        if (modeCfg.highlightFormatting) state.formatting = "strong";
+        return getType(state);
+      } else if (state.em === ch) { // Remove EM
+        if (modeCfg.highlightFormatting) state.formatting = "em";
+        var t = getType(state);
+        state.em = false;
+        return t;
+      } else if (!state.em) { // Add EM
+        state.em = ch;
+        if (modeCfg.highlightFormatting) state.formatting = "em";
+        return getType(state);
+      }
+    } 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 (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 === "(" ? ")" : "]", 0);
+      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: null,
+        thisLine: null,
+
+        block: blockNormal,
+        htmlState: null,
+        indentation: 0,
+
+        inline: inlineNormal,
+        text: handleText,
+
+        formatting: false,
+        linkText: false,
+        linkHref: false,
+        linkTitle: false,
+        code: 0,
+        math: 0,
+        em: false,
+        strong: false,
+        header: 0,
+        hr: false,
+        taskList: false,
+        list: false,
+        listStack: [],
+        quote: 0,
+        trailingSpace: 0,
+        trailingSpaceNewLine: false,
+        strikethrough: false,
+        fencedChars: 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,
+        linkTitle: s.linkTitle,
+        code: s.code,
+        math: s.math,
+        em: s.em,
+        strong: s.strong,
+        strikethrough: s.strikethrough,
+        header: s.header,
+        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,
+        fencedChars: s.fencedChars
+      };
+    },
+
+    token: function(stream, state) {
+
+      // Reset state.formatting
+      state.formatting = false;
+
+      if (stream != state.thisLine) {
+        var forceBlankLine = state.header || state.hr;
+
+        // Reset state.header and state.hr
+        state.header = 0;
+        state.hr = false;
+
+        if (stream.match(/^\s*$/, true) || forceBlankLine) {
+          blankLine(state);
+          if (!forceBlankLine) return null
+          state.prevLine = null
+        }
+
+        state.prevLine = state.thisLine
+        state.thisLine = stream
+
+        // Reset state.taskList
+        state.taskList = false;
+
+        // Reset state.trailingSpace
+        state.trailingSpace = 0;
+        state.trailingSpaceNewLine = false;
+
+        state.f = state.block;
+        var indentation = stream.match(/^\s*/, true)[0].replace(/\t/g, '    ').length;
+        state.indentationDiff = Math.min(indentation - state.indentation, 4);
+        state.indentation = state.indentation + state.indentationDiff;
+        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};
+    },
+
+    blankLine: blankLine,
+
+    getType: getType,
+
+    fold: "markdown"
+  };
+  return mode;
+}, "xml");
+
+CodeMirror.defineMIME("text/x-markdown", "markdown");
+
+});