GPQAPP

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// CodeMirror, copyright (c) by Marijn Haverbeke and others
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// Distributed under an MIT license: https://codemirror.net/LICENSE
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(function(mod) {
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  if (typeof exports == "object" && typeof module == "object") // CommonJS
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    mod(require("../../lib/codemirror"), require("../xml/xml"), require("../meta"));
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  else if (typeof define == "function" && define.amd) // AMD
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    define(["../../lib/codemirror", "../xml/xml", "../meta"], mod);
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  else // Plain browser env
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    mod(CodeMirror);
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})(function(CodeMirror) {
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"use strict";
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CodeMirror.defineMode("markdown", function(cmCfg, modeCfg) {
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  var htmlMode = CodeMirror.getMode(cmCfg, "text/html");
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  var htmlModeMissing = htmlMode.name == "null"
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  function getMode(name) {
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    if (CodeMirror.findModeByName) {
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      var found = CodeMirror.findModeByName(name);
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      if (found) name = found.mime || found.mimes[0];
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    }
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    var mode = CodeMirror.getMode(cmCfg, name);
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    return mode.name == "null" ? null : mode;
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  }
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  // Should characters that affect highlighting be highlighted separate?
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  // Does not include characters that will be output (such as `1.` and `-` for lists)
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  if (modeCfg.highlightFormatting === undefined)
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    modeCfg.highlightFormatting = false;
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  // Maximum number of nested blockquotes. Set to 0 for infinite nesting.
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  // Excess `>` will emit `error` token.
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  if (modeCfg.maxBlockquoteDepth === undefined)
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    modeCfg.maxBlockquoteDepth = 0;
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  // Turn on task lists? ("- [ ] " and "- [x] ")
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  if (modeCfg.taskLists === undefined) modeCfg.taskLists = false;
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  // Turn on strikethrough syntax
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  if (modeCfg.strikethrough === undefined)
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    modeCfg.strikethrough = false;
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  if (modeCfg.emoji === undefined)
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    modeCfg.emoji = false;
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  if (modeCfg.fencedCodeBlockHighlighting === undefined)
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    modeCfg.fencedCodeBlockHighlighting = true;
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  if (modeCfg.fencedCodeBlockDefaultMode === undefined)
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    modeCfg.fencedCodeBlockDefaultMode = 'text/plain';
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  if (modeCfg.xml === undefined)
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    modeCfg.xml = true;
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  // Allow token types to be overridden by user-provided token types.
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  if (modeCfg.tokenTypeOverrides === undefined)
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    modeCfg.tokenTypeOverrides = {};
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  var tokenTypes = {
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    header: "header",
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    code: "comment",
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    quote: "quote",
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    list1: "variable-2",
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    list2: "variable-3",
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    list3: "keyword",
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    hr: "hr",
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    image: "image",
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    imageAltText: "image-alt-text",
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    imageMarker: "image-marker",
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    formatting: "formatting",
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    linkInline: "link",
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    linkEmail: "link",
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    linkText: "link",
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    linkHref: "string",
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    em: "em",
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    strong: "strong",
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    strikethrough: "strikethrough",
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    emoji: "builtin"
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  };
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  for (var tokenType in tokenTypes) {
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    if (tokenTypes.hasOwnProperty(tokenType) && modeCfg.tokenTypeOverrides[tokenType]) {
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      tokenTypes[tokenType] = modeCfg.tokenTypeOverrides[tokenType];
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    }
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  }
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  var hrRE = /^([*\-_])(?:\s*\1){2,}\s*$/
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  ,   listRE = /^(?:[*\-+]|^[0-9]+([.)]))\s+/
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  ,   taskListRE = /^\[(x| )\](?=\s)/i // Must follow listRE
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  ,   atxHeaderRE = modeCfg.allowAtxHeaderWithoutSpace ? /^(#+)/ : /^(#+)(?: |$)/
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  ,   setextHeaderRE = /^ {0,3}(?:\={1,}|-{2,})\s*$/
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  ,   textRE = /^[^#!\[\]*_\\<>` "'(~:]+/
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  ,   fencedCodeRE = /^(~~~+|```+)[ \t]*([\w\/+#-]*)[^\n`]*$/
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  ,   linkDefRE = /^\s*\[[^\]]+?\]:.*$/ // naive link-definition
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  ,   punctuation = /[!"#$%&'()*+,\-.\/:;<=>?@\[\\\]^_`{|}~\xA1\xA7\xAB\xB6\xB7\xBB\xBF\u037E\u0387\u055A-\u055F\u0589\u058A\u05BE\u05C0\u05C3\u05C6\u05F3\u05F4\u0609\u060A\u060C\u060D\u061B\u061E\u061F\u066A-\u066D\u06D4\u0700-\u070D\u07F7-\u07F9\u0830-\u083E\u085E\u0964\u0965\u0970\u0AF0\u0DF4\u0E4F\u0E5A\u0E5B\u0F04-\u0F12\u0F14\u0F3A-\u0F3D\u0F85\u0FD0-\u0FD4\u0FD9\u0FDA\u104A-\u104F\u10FB\u1360-\u1368\u1400\u166D\u166E\u169B\u169C\u16EB-\u16ED\u1735\u1736\u17D4-\u17D6\u17D8-\u17DA\u1800-\u180A\u1944\u1945\u1A1E\u1A1F\u1AA0-\u1AA6\u1AA8-\u1AAD\u1B5A-\u1B60\u1BFC-\u1BFF\u1C3B-\u1C3F\u1C7E\u1C7F\u1CC0-\u1CC7\u1CD3\u2010-\u2027\u2030-\u2043\u2045-\u2051\u2053-\u205E\u207D\u207E\u208D\u208E\u2308-\u230B\u2329\u232A\u2768-\u2775\u27C5\u27C6\u27E6-\u27EF\u2983-\u2998\u29D8-\u29DB\u29FC\u29FD\u2CF9-\u2CFC\u2CFE\u2CFF\u2D70\u2E00-\u2E2E\u2E30-\u2E42\u3001-\u3003\u3008-\u3011\u3014-\u301F\u3030\u303D\u30A0\u30FB\uA4FE\uA4FF\uA60D-\uA60F\uA673\uA67E\uA6F2-\uA6F7\uA874-\uA877\uA8CE\uA8CF\uA8F8-\uA8FA\uA8FC\uA92E\uA92F\uA95F\uA9C1-\uA9CD\uA9DE\uA9DF\uAA5C-\uAA5F\uAADE\uAADF\uAAF0\uAAF1\uABEB\uFD3E\uFD3F\uFE10-\uFE19\uFE30-\uFE52\uFE54-\uFE61\uFE63\uFE68\uFE6A\uFE6B\uFF01-\uFF03\uFF05-\uFF0A\uFF0C-\uFF0F\uFF1A\uFF1B\uFF1F\uFF20\uFF3B-\uFF3D\uFF3F\uFF5B\uFF5D\uFF5F-\uFF65]|\uD800[\uDD00-\uDD02\uDF9F\uDFD0]|\uD801\uDD6F|\uD802[\uDC57\uDD1F\uDD3F\uDE50-\uDE58\uDE7F\uDEF0-\uDEF6\uDF39-\uDF3F\uDF99-\uDF9C]|\uD804[\uDC47-\uDC4D\uDCBB\uDCBC\uDCBE-\uDCC1\uDD40-\uDD43\uDD74\uDD75\uDDC5-\uDDC9\uDDCD\uDDDB\uDDDD-\uDDDF\uDE38-\uDE3D\uDEA9]|\uD805[\uDCC6\uDDC1-\uDDD7\uDE41-\uDE43\uDF3C-\uDF3E]|\uD809[\uDC70-\uDC74]|\uD81A[\uDE6E\uDE6F\uDEF5\uDF37-\uDF3B\uDF44]|\uD82F\uDC9F|\uD836[\uDE87-\uDE8B]/
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  ,   expandedTab = "    " // CommonMark specifies tab as 4 spaces
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  function switchInline(stream, state, f) {
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    state.f = state.inline = f;
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    return f(stream, state);
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  }
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  function switchBlock(stream, state, f) {
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    state.f = state.block = f;
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    return f(stream, state);
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  }
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  function lineIsEmpty(line) {
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    return !line || !/\S/.test(line.string)
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  }
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  // Blocks
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  function blankLine(state) {
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    // Reset linkTitle state
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    state.linkTitle = false;
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    state.linkHref = false;
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    state.linkText = false;
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    // Reset EM state
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    state.em = false;
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    // Reset STRONG state
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    state.strong = false;
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    // Reset strikethrough state
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    state.strikethrough = false;
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    // Reset state.quote
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    state.quote = 0;
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    // Reset state.indentedCode
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    state.indentedCode = false;
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    if (state.f == htmlBlock) {
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      var exit = htmlModeMissing
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      if (!exit) {
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        var inner = CodeMirror.innerMode(htmlMode, state.htmlState)
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        exit = inner.mode.name == "xml" && inner.state.tagStart === null &&
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          (!inner.state.context && inner.state.tokenize.isInText)
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      }
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      if (exit) {
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        state.f = inlineNormal;
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        state.block = blockNormal;
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        state.htmlState = null;
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      }
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    }
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    // Reset state.trailingSpace
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    state.trailingSpace = 0;
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    state.trailingSpaceNewLine = false;
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    // Mark this line as blank
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    state.prevLine = state.thisLine
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    state.thisLine = {stream: null}
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    return null;
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  }
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  function blockNormal(stream, state) {
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    var firstTokenOnLine = stream.column() === state.indentation;
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    var prevLineLineIsEmpty = lineIsEmpty(state.prevLine.stream);
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    var prevLineIsIndentedCode = state.indentedCode;
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    var prevLineIsHr = state.prevLine.hr;
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    var prevLineIsList = state.list !== false;
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    var maxNonCodeIndentation = (state.listStack[state.listStack.length - 1] || 0) + 3;
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    state.indentedCode = false;
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    var lineIndentation = state.indentation;
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    // compute once per line (on first token)
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    if (state.indentationDiff === null) {
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      state.indentationDiff = state.indentation;
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      if (prevLineIsList) {
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        state.list = null;
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        // While this list item's marker's indentation is less than the deepest
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        //  list item's content's indentation,pop the deepest list item
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        //  indentation off the stack, and update block indentation state
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        while (lineIndentation < state.listStack[state.listStack.length - 1]) {
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          state.listStack.pop();
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          if (state.listStack.length) {
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            state.indentation = state.listStack[state.listStack.length - 1];
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          // less than the first list's indent -> the line is no longer a list
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          } else {
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            state.list = false;
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          }
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        }
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        if (state.list !== false) {
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          state.indentationDiff = lineIndentation - state.listStack[state.listStack.length - 1]
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        }
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      }
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    }
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    // not comprehensive (currently only for setext detection purposes)
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    var allowsInlineContinuation = (
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        !prevLineLineIsEmpty && !prevLineIsHr && !state.prevLine.header &&
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        (!prevLineIsList || !prevLineIsIndentedCode) &&
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        !state.prevLine.fencedCodeEnd
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    );
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    var isHr = (state.list === false || prevLineIsHr || prevLineLineIsEmpty) &&
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      state.indentation <= maxNonCodeIndentation && stream.match(hrRE);
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    var match = null;
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    if (state.indentationDiff >= 4 && (prevLineIsIndentedCode || state.prevLine.fencedCodeEnd ||
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         state.prevLine.header || prevLineLineIsEmpty)) {
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      stream.skipToEnd();
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      state.indentedCode = true;
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      return tokenTypes.code;
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    } else if (stream.eatSpace()) {
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      return null;
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    } else if (firstTokenOnLine && state.indentation <= maxNonCodeIndentation && (match = stream.match(atxHeaderRE)) && match[1].length <= 6) {
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      state.quote = 0;
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      state.header = match[1].length;
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      state.thisLine.header = true;
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      if (modeCfg.highlightFormatting) state.formatting = "header";
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      state.f = state.inline;
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      return getType(state);
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    } else if (state.indentation <= maxNonCodeIndentation && stream.eat('>')) {
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      state.quote = firstTokenOnLine ? 1 : state.quote + 1;
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      if (modeCfg.highlightFormatting) state.formatting = "quote";
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      stream.eatSpace();
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      return getType(state);
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    } else if (!isHr && !state.setext && firstTokenOnLine && state.indentation <= maxNonCodeIndentation && (match = stream.match(listRE))) {
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      var listType = match[1] ? "ol" : "ul";
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      state.indentation = lineIndentation + stream.current().length;
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      state.list = true;
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      state.quote = 0;
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      // Add this list item's content's indentation to the stack
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      state.listStack.push(state.indentation);
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      // Reset inline styles which shouldn't propagate across list items
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      state.em = false;
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      state.strong = false;
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      state.code = false;
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      state.strikethrough = false;
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      if (modeCfg.taskLists && stream.match(taskListRE, false)) {
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        state.taskList = true;
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      }
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      state.f = state.inline;
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      if (modeCfg.highlightFormatting) state.formatting = ["list", "list-" + listType];
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      return getType(state);
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    } else if (firstTokenOnLine && state.indentation <= maxNonCodeIndentation && (match = stream.match(fencedCodeRE, true))) {
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      state.quote = 0;
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      state.fencedEndRE = new RegExp(match[1] + "+ *$");
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      // try switching mode
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      state.localMode = modeCfg.fencedCodeBlockHighlighting && getMode(match[2] || modeCfg.fencedCodeBlockDefaultMode );
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      if (state.localMode) state.localState = CodeMirror.startState(state.localMode);
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      state.f = state.block = local;
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      if (modeCfg.highlightFormatting) state.formatting = "code-block";
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      state.code = -1
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      return getType(state);
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    // SETEXT has lowest block-scope precedence after HR, so check it after
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    //  the others (code, blockquote, list...)
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    } else if (
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      // if setext set, indicates line after ---/===
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      state.setext || (
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        // line before ---/===
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        (!allowsInlineContinuation || !prevLineIsList) && !state.quote && state.list === false &&
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        !state.code && !isHr && !linkDefRE.test(stream.string) &&
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        (match = stream.lookAhead(1)) && (match = match.match(setextHeaderRE))
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      )
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    ) {
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      if ( !state.setext ) {
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        state.header = match[0].charAt(0) == '=' ? 1 : 2;
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        state.setext = state.header;
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      } else {
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        state.header = state.setext;
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        // has no effect on type so we can reset it now
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        state.setext = 0;
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        stream.skipToEnd();
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        if (modeCfg.highlightFormatting) state.formatting = "header";
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      }
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      state.thisLine.header = true;
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      state.f = state.inline;
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      return getType(state);
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    } else if (isHr) {
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      stream.skipToEnd();
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      state.hr = true;
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      state.thisLine.hr = true;
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      return tokenTypes.hr;
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    } else if (stream.peek() === '[') {
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      return switchInline(stream, state, footnoteLink);
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    }
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    return switchInline(stream, state, state.inline);
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  }
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  function htmlBlock(stream, state) {
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    var style = htmlMode.token(stream, state.htmlState);
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    if (!htmlModeMissing) {
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      var inner = CodeMirror.innerMode(htmlMode, state.htmlState)
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      if ((inner.mode.name == "xml" && inner.state.tagStart === null &&
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           (!inner.state.context && inner.state.tokenize.isInText)) ||
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          (state.md_inside && stream.current().indexOf(">") > -1)) {
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        state.f = inlineNormal;
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        state.block = blockNormal;
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        state.htmlState = null;
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      }
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    }
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    return style;
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  }
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  function local(stream, state) {
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    var currListInd = state.listStack[state.listStack.length - 1] || 0;
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    var hasExitedList = state.indentation < currListInd;
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    var maxFencedEndInd = currListInd + 3;
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    if (state.fencedEndRE && state.indentation <= maxFencedEndInd && (hasExitedList || stream.match(state.fencedEndRE))) {
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      if (modeCfg.highlightFormatting) state.formatting = "code-block";
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      var returnType;
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      if (!hasExitedList) returnType = getType(state)
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      state.localMode = state.localState = null;
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      state.block = blockNormal;
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      state.f = inlineNormal;
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      state.fencedEndRE = null;
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      state.code = 0
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      state.thisLine.fencedCodeEnd = true;
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      if (hasExitedList) return switchBlock(stream, state, state.block);
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      return returnType;
315
    } else if (state.localMode) {
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      return state.localMode.token(stream, state.localState);
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    } else {
318
      stream.skipToEnd();
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      return tokenTypes.code;
320
    }
321
  }
322

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  // Inline
324
  function getType(state) {
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    var styles = [];
326

327
    if (state.formatting) {
328
      styles.push(tokenTypes.formatting);
329

330
      if (typeof state.formatting === "string") state.formatting = [state.formatting];
331

332
      for (var i = 0; i < state.formatting.length; i++) {
333
        styles.push(tokenTypes.formatting + "-" + state.formatting[i]);
334

335
        if (state.formatting[i] === "header") {
336
          styles.push(tokenTypes.formatting + "-" + state.formatting[i] + "-" + state.header);
337
        }
338

339
        // Add `formatting-quote` and `formatting-quote-#` for blockquotes
340
        // Add `error` instead if the maximum blockquote nesting depth is passed
341
        if (state.formatting[i] === "quote") {
342
          if (!modeCfg.maxBlockquoteDepth || modeCfg.maxBlockquoteDepth >= state.quote) {
343
            styles.push(tokenTypes.formatting + "-" + state.formatting[i] + "-" + state.quote);
344
          } else {
345
            styles.push("error");
346
          }
347
        }
348
      }
349
    }
350

351
    if (state.taskOpen) {
352
      styles.push("meta");
353
      return styles.length ? styles.join(' ') : null;
354
    }
355
    if (state.taskClosed) {
356
      styles.push("property");
357
      return styles.length ? styles.join(' ') : null;
358
    }
359

360
    if (state.linkHref) {
361
      styles.push(tokenTypes.linkHref, "url");
362
    } else { // Only apply inline styles to non-url text
363
      if (state.strong) { styles.push(tokenTypes.strong); }
364
      if (state.em) { styles.push(tokenTypes.em); }
365
      if (state.strikethrough) { styles.push(tokenTypes.strikethrough); }
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      if (state.emoji) { styles.push(tokenTypes.emoji); }
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      if (state.linkText) { styles.push(tokenTypes.linkText); }
368
      if (state.code) { styles.push(tokenTypes.code); }
369
      if (state.image) { styles.push(tokenTypes.image); }
370
      if (state.imageAltText) { styles.push(tokenTypes.imageAltText, "link"); }
371
      if (state.imageMarker) { styles.push(tokenTypes.imageMarker); }
372
    }
373

374
    if (state.header) { styles.push(tokenTypes.header, tokenTypes.header + "-" + state.header); }
375

376
    if (state.quote) {
377
      styles.push(tokenTypes.quote);
378

379
      // Add `quote-#` where the maximum for `#` is modeCfg.maxBlockquoteDepth
380
      if (!modeCfg.maxBlockquoteDepth || modeCfg.maxBlockquoteDepth >= state.quote) {
381
        styles.push(tokenTypes.quote + "-" + state.quote);
382
      } else {
383
        styles.push(tokenTypes.quote + "-" + modeCfg.maxBlockquoteDepth);
384
      }
385
    }
386

387
    if (state.list !== false) {
388
      var listMod = (state.listStack.length - 1) % 3;
389
      if (!listMod) {
390
        styles.push(tokenTypes.list1);
391
      } else if (listMod === 1) {
392
        styles.push(tokenTypes.list2);
393
      } else {
394
        styles.push(tokenTypes.list3);
395
      }
396
    }
397

398
    if (state.trailingSpaceNewLine) {
399
      styles.push("trailing-space-new-line");
400
    } else if (state.trailingSpace) {
401
      styles.push("trailing-space-" + (state.trailingSpace % 2 ? "a" : "b"));
402
    }
403

404
    return styles.length ? styles.join(' ') : null;
405
  }
406

407
  function handleText(stream, state) {
408
    if (stream.match(textRE, true)) {
409
      return getType(state);
410
    }
411
    return undefined;
412
  }
413

414
  function inlineNormal(stream, state) {
415
    var style = state.text(stream, state);
416
    if (typeof style !== 'undefined')
417
      return style;
418

419
    if (state.list) { // List marker (*, +, -, 1., etc)
420
      state.list = null;
421
      return getType(state);
422
    }
423

424
    if (state.taskList) {
425
      var taskOpen = stream.match(taskListRE, true)[1] === " ";
426
      if (taskOpen) state.taskOpen = true;
427
      else state.taskClosed = true;
428
      if (modeCfg.highlightFormatting) state.formatting = "task";
429
      state.taskList = false;
430
      return getType(state);
431
    }
432

433
    state.taskOpen = false;
434
    state.taskClosed = false;
435

436
    if (state.header && stream.match(/^#+$/, true)) {
437
      if (modeCfg.highlightFormatting) state.formatting = "header";
438
      return getType(state);
439
    }
440

441
    var ch = stream.next();
442

443
    // Matches link titles present on next line
444
    if (state.linkTitle) {
445
      state.linkTitle = false;
446
      var matchCh = ch;
447
      if (ch === '(') {
448
        matchCh = ')';
449
      }
450
      matchCh = (matchCh+'').replace(/([.?*+^\[\]\\(){}|-])/g, "\\$1");
451
      var regex = '^\\s*(?:[^' + matchCh + '\\\\]+|\\\\\\\\|\\\\.)' + matchCh;
452
      if (stream.match(new RegExp(regex), true)) {
453
        return tokenTypes.linkHref;
454
      }
455
    }
456

457
    // If this block is changed, it may need to be updated in GFM mode
458
    if (ch === '`') {
459
      var previousFormatting = state.formatting;
460
      if (modeCfg.highlightFormatting) state.formatting = "code";
461
      stream.eatWhile('`');
462
      var count = stream.current().length
463
      if (state.code == 0 && (!state.quote || count == 1)) {
464
        state.code = count
465
        return getType(state)
466
      } else if (count == state.code) { // Must be exact
467
        var t = getType(state)
468
        state.code = 0
469
        return t
470
      } else {
471
        state.formatting = previousFormatting
472
        return getType(state)
473
      }
474
    } else if (state.code) {
475
      return getType(state);
476
    }
477

478
    if (ch === '\\') {
479
      stream.next();
480
      if (modeCfg.highlightFormatting) {
481
        var type = getType(state);
482
        var formattingEscape = tokenTypes.formatting + "-escape";
483
        return type ? type + " " + formattingEscape : formattingEscape;
484
      }
485
    }
486

487
    if (ch === '!' && stream.match(/\[[^\]]*\] ?(?:\(|\[)/, false)) {
488
      state.imageMarker = true;
489
      state.image = true;
490
      if (modeCfg.highlightFormatting) state.formatting = "image";
491
      return getType(state);
492
    }
493

494
    if (ch === '[' && state.imageMarker && stream.match(/[^\]]*\](\(.*?\)| ?\[.*?\])/, false)) {
495
      state.imageMarker = false;
496
      state.imageAltText = true
497
      if (modeCfg.highlightFormatting) state.formatting = "image";
498
      return getType(state);
499
    }
500

501
    if (ch === ']' && state.imageAltText) {
502
      if (modeCfg.highlightFormatting) state.formatting = "image";
503
      var type = getType(state);
504
      state.imageAltText = false;
505
      state.image = false;
506
      state.inline = state.f = linkHref;
507
      return type;
508
    }
509

510
    if (ch === '[' && !state.image) {
511
      if (state.linkText && stream.match(/^.*?\]/)) return getType(state)
512
      state.linkText = true;
513
      if (modeCfg.highlightFormatting) state.formatting = "link";
514
      return getType(state);
515
    }
516

517
    if (ch === ']' && state.linkText) {
518
      if (modeCfg.highlightFormatting) state.formatting = "link";
519
      var type = getType(state);
520
      state.linkText = false;
521
      state.inline = state.f = stream.match(/\(.*?\)| ?\[.*?\]/, false) ? linkHref : inlineNormal
522
      return type;
523
    }
524

525
    if (ch === '<' && stream.match(/^(https?|ftps?):\/\/(?:[^\\>]|\\.)+>/, false)) {
526
      state.f = state.inline = linkInline;
527
      if (modeCfg.highlightFormatting) state.formatting = "link";
528
      var type = getType(state);
529
      if (type){
530
        type += " ";
531
      } else {
532
        type = "";
533
      }
534
      return type + tokenTypes.linkInline;
535
    }
536

537
    if (ch === '<' && stream.match(/^[^> \\]+@(?:[^\\>]|\\.)+>/, false)) {
538
      state.f = state.inline = linkInline;
539
      if (modeCfg.highlightFormatting) state.formatting = "link";
540
      var type = getType(state);
541
      if (type){
542
        type += " ";
543
      } else {
544
        type = "";
545
      }
546
      return type + tokenTypes.linkEmail;
547
    }
548

549
    if (modeCfg.xml && ch === '<' && stream.match(/^(!--|\?|!\[CDATA\[|[a-z][a-z0-9-]*(?:\s+[a-z_:.\-]+(?:\s*=\s*[^>]+)?)*\s*(?:>|$))/i, false)) {
550
      var end = stream.string.indexOf(">", stream.pos);
551
      if (end != -1) {
552
        var atts = stream.string.substring(stream.start, end);
553
        if (/markdown\s*=\s*('|"){0,1}1('|"){0,1}/.test(atts)) state.md_inside = true;
554
      }
555
      stream.backUp(1);
556
      state.htmlState = CodeMirror.startState(htmlMode);
557
      return switchBlock(stream, state, htmlBlock);
558
    }
559

560
    if (modeCfg.xml && ch === '<' && stream.match(/^\/\w*?>/)) {
561
      state.md_inside = false;
562
      return "tag";
563
    } else if (ch === "*" || ch === "_") {
564
      var len = 1, before = stream.pos == 1 ? " " : stream.string.charAt(stream.pos - 2)
565
      while (len < 3 && stream.eat(ch)) len++
566
      var after = stream.peek() || " "
567
      // See http://spec.commonmark.org/0.27/#emphasis-and-strong-emphasis
568
      var leftFlanking = !/\s/.test(after) && (!punctuation.test(after) || /\s/.test(before) || punctuation.test(before))
569
      var rightFlanking = !/\s/.test(before) && (!punctuation.test(before) || /\s/.test(after) || punctuation.test(after))
570
      var setEm = null, setStrong = null
571
      if (len % 2) { // Em
572
        if (!state.em && leftFlanking && (ch === "*" || !rightFlanking || punctuation.test(before)))
573
          setEm = true
574
        else if (state.em == ch && rightFlanking && (ch === "*" || !leftFlanking || punctuation.test(after)))
575
          setEm = false
576
      }
577
      if (len > 1) { // Strong
578
        if (!state.strong && leftFlanking && (ch === "*" || !rightFlanking || punctuation.test(before)))
579
          setStrong = true
580
        else if (state.strong == ch && rightFlanking && (ch === "*" || !leftFlanking || punctuation.test(after)))
581
          setStrong = false
582
      }
583
      if (setStrong != null || setEm != null) {
584
        if (modeCfg.highlightFormatting) state.formatting = setEm == null ? "strong" : setStrong == null ? "em" : "strong em"
585
        if (setEm === true) state.em = ch
586
        if (setStrong === true) state.strong = ch
587
        var t = getType(state)
588
        if (setEm === false) state.em = false
589
        if (setStrong === false) state.strong = false
590
        return t
591
      }
592
    } else if (ch === ' ') {
593
      if (stream.eat('*') || stream.eat('_')) { // Probably surrounded by spaces
594
        if (stream.peek() === ' ') { // Surrounded by spaces, ignore
595
          return getType(state);
596
        } else { // Not surrounded by spaces, back up pointer
597
          stream.backUp(1);
598
        }
599
      }
600
    }
601

602
    if (modeCfg.strikethrough) {
603
      if (ch === '~' && stream.eatWhile(ch)) {
604
        if (state.strikethrough) {// Remove strikethrough
605
          if (modeCfg.highlightFormatting) state.formatting = "strikethrough";
606
          var t = getType(state);
607
          state.strikethrough = false;
608
          return t;
609
        } else if (stream.match(/^[^\s]/, false)) {// Add strikethrough
610
          state.strikethrough = true;
611
          if (modeCfg.highlightFormatting) state.formatting = "strikethrough";
612
          return getType(state);
613
        }
614
      } else if (ch === ' ') {
615
        if (stream.match('~~', true)) { // Probably surrounded by space
616
          if (stream.peek() === ' ') { // Surrounded by spaces, ignore
617
            return getType(state);
618
          } else { // Not surrounded by spaces, back up pointer
619
            stream.backUp(2);
620
          }
621
        }
622
      }
623
    }
624

625
    if (modeCfg.emoji && ch === ":" && stream.match(/^(?:[a-z_\d+][a-z_\d+-]*|\-[a-z_\d+][a-z_\d+-]*):/)) {
626
      state.emoji = true;
627
      if (modeCfg.highlightFormatting) state.formatting = "emoji";
628
      var retType = getType(state);
629
      state.emoji = false;
630
      return retType;
631
    }
632

633
    if (ch === ' ') {
634
      if (stream.match(/^ +$/, false)) {
635
        state.trailingSpace++;
636
      } else if (state.trailingSpace) {
637
        state.trailingSpaceNewLine = true;
638
      }
639
    }
640

641
    return getType(state);
642
  }
643

644
  function linkInline(stream, state) {
645
    var ch = stream.next();
646

647
    if (ch === ">") {
648
      state.f = state.inline = inlineNormal;
649
      if (modeCfg.highlightFormatting) state.formatting = "link";
650
      var type = getType(state);
651
      if (type){
652
        type += " ";
653
      } else {
654
        type = "";
655
      }
656
      return type + tokenTypes.linkInline;
657
    }
658

659
    stream.match(/^[^>]+/, true);
660

661
    return tokenTypes.linkInline;
662
  }
663

664
  function linkHref(stream, state) {
665
    // Check if space, and return NULL if so (to avoid marking the space)
666
    if(stream.eatSpace()){
667
      return null;
668
    }
669
    var ch = stream.next();
670
    if (ch === '(' || ch === '[') {
671
      state.f = state.inline = getLinkHrefInside(ch === "(" ? ")" : "]");
672
      if (modeCfg.highlightFormatting) state.formatting = "link-string";
673
      state.linkHref = true;
674
      return getType(state);
675
    }
676
    return 'error';
677
  }
678

679
  var linkRE = {
680
    ")": /^(?:[^\\\(\)]|\\.|\((?:[^\\\(\)]|\\.)*\))*?(?=\))/,
681
    "]": /^(?:[^\\\[\]]|\\.|\[(?:[^\\\[\]]|\\.)*\])*?(?=\])/
682
  }
683

684
  function getLinkHrefInside(endChar) {
685
    return function(stream, state) {
686
      var ch = stream.next();
687

688
      if (ch === endChar) {
689
        state.f = state.inline = inlineNormal;
690
        if (modeCfg.highlightFormatting) state.formatting = "link-string";
691
        var returnState = getType(state);
692
        state.linkHref = false;
693
        return returnState;
694
      }
695

696
      stream.match(linkRE[endChar])
697
      state.linkHref = true;
698
      return getType(state);
699
    };
700
  }
701

702
  function footnoteLink(stream, state) {
703
    if (stream.match(/^([^\]\\]|\\.)*\]:/, false)) {
704
      state.f = footnoteLinkInside;
705
      stream.next(); // Consume [
706
      if (modeCfg.highlightFormatting) state.formatting = "link";
707
      state.linkText = true;
708
      return getType(state);
709
    }
710
    return switchInline(stream, state, inlineNormal);
711
  }
712

713
  function footnoteLinkInside(stream, state) {
714
    if (stream.match(']:', true)) {
715
      state.f = state.inline = footnoteUrl;
716
      if (modeCfg.highlightFormatting) state.formatting = "link";
717
      var returnType = getType(state);
718
      state.linkText = false;
719
      return returnType;
720
    }
721

722
    stream.match(/^([^\]\\]|\\.)+/, true);
723

724
    return tokenTypes.linkText;
725
  }
726

727
  function footnoteUrl(stream, state) {
728
    // Check if space, and return NULL if so (to avoid marking the space)
729
    if(stream.eatSpace()){
730
      return null;
731
    }
732
    // Match URL
733
    stream.match(/^[^\s]+/, true);
734
    // Check for link title
735
    if (stream.peek() === undefined) { // End of line, set flag to check next line
736
      state.linkTitle = true;
737
    } else { // More content on line, check if link title
738
      stream.match(/^(?:\s+(?:"(?:[^"\\]|\\.)+"|'(?:[^'\\]|\\.)+'|\((?:[^)\\]|\\.)+\)))?/, true);
739
    }
740
    state.f = state.inline = inlineNormal;
741
    return tokenTypes.linkHref + " url";
742
  }
743

744
  var mode = {
745
    startState: function() {
746
      return {
747
        f: blockNormal,
748

749
        prevLine: {stream: null},
750
        thisLine: {stream: null},
751

752
        block: blockNormal,
753
        htmlState: null,
754
        indentation: 0,
755

756
        inline: inlineNormal,
757
        text: handleText,
758

759
        formatting: false,
760
        linkText: false,
761
        linkHref: false,
762
        linkTitle: false,
763
        code: 0,
764
        em: false,
765
        strong: false,
766
        header: 0,
767
        setext: 0,
768
        hr: false,
769
        taskList: false,
770
        list: false,
771
        listStack: [],
772
        quote: 0,
773
        trailingSpace: 0,
774
        trailingSpaceNewLine: false,
775
        strikethrough: false,
776
        emoji: false,
777
        fencedEndRE: null
778
      };
779
    },
780

781
    copyState: function(s) {
782
      return {
783
        f: s.f,
784

785
        prevLine: s.prevLine,
786
        thisLine: s.thisLine,
787

788
        block: s.block,
789
        htmlState: s.htmlState && CodeMirror.copyState(htmlMode, s.htmlState),
790
        indentation: s.indentation,
791

792
        localMode: s.localMode,
793
        localState: s.localMode ? CodeMirror.copyState(s.localMode, s.localState) : null,
794

795
        inline: s.inline,
796
        text: s.text,
797
        formatting: false,
798
        linkText: s.linkText,
799
        linkTitle: s.linkTitle,
800
        linkHref: s.linkHref,
801
        code: s.code,
802
        em: s.em,
803
        strong: s.strong,
804
        strikethrough: s.strikethrough,
805
        emoji: s.emoji,
806
        header: s.header,
807
        setext: s.setext,
808
        hr: s.hr,
809
        taskList: s.taskList,
810
        list: s.list,
811
        listStack: s.listStack.slice(0),
812
        quote: s.quote,
813
        indentedCode: s.indentedCode,
814
        trailingSpace: s.trailingSpace,
815
        trailingSpaceNewLine: s.trailingSpaceNewLine,
816
        md_inside: s.md_inside,
817
        fencedEndRE: s.fencedEndRE
818
      };
819
    },
820

821
    token: function(stream, state) {
822

823
      // Reset state.formatting
824
      state.formatting = false;
825

826
      if (stream != state.thisLine.stream) {
827
        state.header = 0;
828
        state.hr = false;
829

830
        if (stream.match(/^\s*$/, true)) {
831
          blankLine(state);
832
          return null;
833
        }
834

835
        state.prevLine = state.thisLine
836
        state.thisLine = {stream: stream}
837

838
        // Reset state.taskList
839
        state.taskList = false;
840

841
        // Reset state.trailingSpace
842
        state.trailingSpace = 0;
843
        state.trailingSpaceNewLine = false;
844

845
        if (!state.localState) {
846
          state.f = state.block;
847
          if (state.f != htmlBlock) {
848
            var indentation = stream.match(/^\s*/, true)[0].replace(/\t/g, expandedTab).length;
849
            state.indentation = indentation;
850
            state.indentationDiff = null;
851
            if (indentation > 0) return null;
852
          }
853
        }
854
      }
855
      return state.f(stream, state);
856
    },
857

858
    innerMode: function(state) {
859
      if (state.block == htmlBlock) return {state: state.htmlState, mode: htmlMode};
860
      if (state.localState) return {state: state.localState, mode: state.localMode};
861
      return {state: state, mode: mode};
862
    },
863

864
    indent: function(state, textAfter, line) {
865
      if (state.block == htmlBlock && htmlMode.indent) return htmlMode.indent(state.htmlState, textAfter, line)
866
      if (state.localState && state.localMode.indent) return state.localMode.indent(state.localState, textAfter, line)
867
      return CodeMirror.Pass
868
    },
869

870
    blankLine: blankLine,
871

872
    getType: getType,
873

874
    blockCommentStart: "<!--",
875
    blockCommentEnd: "-->",
876
    closeBrackets: "()[]{}''\"\"``",
877
    fold: "markdown"
878
  };
879
  return mode;
880
}, "xml");
881

882
CodeMirror.defineMIME("text/markdown", "markdown");
883

884
CodeMirror.defineMIME("text/x-markdown", "markdown");
885

886
});
887