/**
 * Copyright (c) 2017-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

const React = require("react");
const Prism = require("./Prism.js");
const Header = require("./Header.js");

/**
 * Block-Level Grammar
 */

const block = {
  newline: /^\n+/,
  code: /^( {4}[^\n]+\n*)+/,
  fences: noop,
  hr: /^( *[-*_]){3,} *(?:\n+|$)/,
  heading: /^ *(#{1,6}) *([^\n]+?) *#* *(?:\n+|$)/,
  nptable: noop,
  lheading: /^([^\n]+)\n *(=|-){3,} *\n*/,
  blockquote: /^( *>[^\n]+(\n[^\n]+)*\n*)+/,
  list: /^( *)(bull) [\s\S]+?(?:hr|\n{2,}(?! )(?!\1bull )\n*|\s*$)/,
  html: /^ *(?:comment|closed|closing) *(?:\n{2,}|\s*$)/,
  def: /^ *\[([^\]]+)\]: *<?([^\s>]+)>?(?: +["(]([^\n]+)[")])? *(?:\n+|$)/,
  table: noop,
  paragraph: /^((?:[^\n]+\n?(?!hr|heading|lheading|blockquote|tag|def))+)\n*/,
  text: /^[^\n]+/
};

block.bullet = /(?:[*+-]|\d+\.)/;
block.item = /^( *)(bull) [^\n]*(?:\n(?!\1bull )[^\n]*)*/;
block.item = replace(block.item, "gm")(/bull/g, block.bullet)();

block.list = replace(block.list)(/bull/g, block.bullet)(
  "hr",
  /\n+(?=(?: *[-*_]){3,} *(?:\n+|$))/
)();

block._tag =
  "(?!(?:" +
  "a|em|strong|small|s|cite|q|dfn|abbr|data|time|code" +
  "|var|samp|kbd|sub|sup|i|b|u|mark|ruby|rt|rp|bdi|bdo" +
  "|span|br|wbr|ins|del|img)\\b)\\w+(?!:/|@)\\b";

block.html = replace(block.html)("comment", /<!--[\s\S]*?-->/)(
  "closed",
  /<(tag)[\s\S]+?<\/\1>/
)("closing", /<tag(?:"[^"]*"|'[^']*'|[^'">])*?>/)(/tag/g, block._tag)();

block.paragraph = replace(block.paragraph)("hr", block.hr)(
  "heading",
  block.heading
)("lheading", block.lheading)("blockquote", block.blockquote)(
  "tag",
  "<" + block._tag
)("def", block.def)();

/**
 * Normal Block Grammar
 */

block.normal = merge({}, block);

/**
 * GFM Block Grammar
 */

block.gfm = merge({}, block.normal, {
  fences: /^ *(`{3,}|~{3,}) *(\S+)? *\n([\s\S]+?)\s*\1 *(?:\n+|$)/,
  paragraph: /^/
});

block.gfm.paragraph = replace(block.paragraph)(
  "(?!",
  "(?!" + block.gfm.fences.source.replace("\\1", "\\2") + "|"
)();

/**
 * GFM + Tables Block Grammar
 */

block.tables = merge({}, block.gfm, {
  nptable: /^ *(\S.*\|.*)\n *([-:]+ *\|[-| :]*)\n((?:.*\|.*(?:\n|$))*)\n*/,
  table: /^ *\|(.+)\n *\|( *[-:]+[-| :]*)\n((?: *\|.*(?:\n|$))*)\n*/
});

/**
 * Block Lexer
 */

function Lexer(options) {
  this.tokens = [];
  this.tokens.links = {};
  this.options = options || marked.defaults;
  this.rules = block.normal;

  if (this.options.gfm) {
    if (this.options.tables) {
      this.rules = block.tables;
    } else {
      this.rules = block.gfm;
    }
  }
}

/**
 * Expose Block Rules
 */

Lexer.rules = block;

/**
 * Static Lex Method
 */

Lexer.lex = function(src, options) {
  const lexer = new Lexer(options);
  return lexer.lex(src);
};

/**
 * Preprocessing
 */

Lexer.prototype.lex = function(src) {
  src = src
    .replace(/\r\n|\r/g, "\n")
    .replace(/\t/g, "    ")
    .replace(/\u00a0/g, " ")
    .replace(/\u2424/g, "\n");

  return this.token(src, true);
};

/**
 * Lexing
 */

Lexer.prototype.token = function(_src, top) {
  let src = _src.replace(/^ +$/gm, "");
  let next;
  let loose;
  let cap;
  let bull;
  let b;
  let item;
  let space;
  let i;
  let l;

  while (src) {
    // newline
    if ((cap = this.rules.newline.exec(src))) {
      src = src.substring(cap[0].length);
      if (cap[0].length > 1) {
        this.tokens.push({
          type: "space"
        });
      }
    }

    // code
    if ((cap = this.rules.code.exec(src))) {
      src = src.substring(cap[0].length);
      cap = cap[0].replace(/^ {4}/gm, "");
      this.tokens.push({
        type: "code",
        text: !this.options.pedantic ? cap.replace(/\n+$/, "") : cap
      });
      continue;
    }

    // fences (gfm)
    if ((cap = this.rules.fences.exec(src))) {
      src = src.substring(cap[0].length);
      this.tokens.push({
        type: "code",
        lang: cap[2],
        text: cap[3]
      });
      continue;
    }

    // heading
    if ((cap = this.rules.heading.exec(src))) {
      src = src.substring(cap[0].length);
      this.tokens.push({
        type: "heading",
        depth: cap[1].length,
        text: cap[2]
      });
      continue;
    }

    // table no leading pipe (gfm)
    if (top && (cap = this.rules.nptable.exec(src))) {
      src = src.substring(cap[0].length);

      item = {
        type: "table",
        header: cap[1].replace(/^ *| *\| *$/g, "").split(/ *\| */),
        align: cap[2].replace(/^ *|\| *$/g, "").split(/ *\| */),
        cells: cap[3].replace(/\n$/, "").split("\n")
      };

      for (i = 0; i < item.align.length; i++) {
        if (/^ *-+: *$/.test(item.align[i])) {
          item.align[i] = "right";
        } else if (/^ *:-+: *$/.test(item.align[i])) {
          item.align[i] = "center";
        } else if (/^ *:-+ *$/.test(item.align[i])) {
          item.align[i] = "left";
        } else {
          item.align[i] = null;
        }
      }

      for (i = 0; i < item.cells.length; i++) {
        item.cells[i] = item.cells[i].split(/ *\| */);
      }

      this.tokens.push(item);

      continue;
    }

    // lheading
    if ((cap = this.rules.lheading.exec(src))) {
      src = src.substring(cap[0].length);
      this.tokens.push({
        type: "heading",
        depth: cap[2] === "=" ? 1 : 2,
        text: cap[1]
      });
      continue;
    }

    // hr
    if ((cap = this.rules.hr.exec(src))) {
      src = src.substring(cap[0].length);
      this.tokens.push({
        type: "hr"
      });
      continue;
    }

    // blockquote
    if ((cap = this.rules.blockquote.exec(src))) {
      src = src.substring(cap[0].length);

      this.tokens.push({
        type: "blockquote_start"
      });

      cap = cap[0].replace(/^ *> ?/gm, "");

      // Pass `top` to keep the current
      // "toplevel" state. This is exactly
      // how markdown.pl works.
      this.token(cap, top);

      this.tokens.push({
        type: "blockquote_end"
      });

      continue;
    }

    // list
    if ((cap = this.rules.list.exec(src))) {
      src = src.substring(cap[0].length);
      bull = cap[2];

      this.tokens.push({
        type: "list_start",
        ordered: bull.length > 1
      });

      // Get each top-level item.
      cap = cap[0].match(this.rules.item);

      next = false;
      l = cap.length;
      i = 0;

      for (; i < l; i++) {
        item = cap[i];

        // Remove the list item's bullet
        // so it is seen as the next token.
        space = item.length;
        item = item.replace(/^ *([*+-]|\d+\.) +/, "");

        // Outdent whatever the
        // list item contains. Hacky.
        if (~item.indexOf("\n ")) {
          // eslint-disable-line
          space -= item.length;
          item = !this.options.pedantic
            ? item.replace(new RegExp("^ {1," + space + "}", "gm"), "")
            : item.replace(/^ {1,4}/gm, "");
        }

        // Determine whether the next list item belongs here.
        // Backpedal if it does not belong in this list.
        if (this.options.smartLists && i !== l - 1) {
          b = block.bullet.exec(cap[i + 1])[0];
          if (bull !== b && !(bull.length > 1 && b.length > 1)) {
            src = cap.slice(i + 1).join("\n") + src;
            i = l - 1;
          }
        }

        // Determine whether item is loose or not.
        // Use: /(^|\n)(?! )[^\n]+\n\n(?!\s*$)/
        // for discount behavior.
        loose = next || /\n\n(?!\s*$)/.test(item);
        if (i !== l - 1) {
          next = item[item.length - 1] === "\n";
          if (!loose) {
            loose = next;
          }
        }

        this.tokens.push({
          type: loose ? "loose_item_start" : "list_item_start"
        });

        // Recurse.
        this.token(item, false);

        this.tokens.push({
          type: "list_item_end"
        });
      }

      this.tokens.push({
        type: "list_end"
      });

      continue;
    }

    // html
    if ((cap = this.rules.html.exec(src))) {
      src = src.substring(cap[0].length);
      this.tokens.push({
        type: this.options.sanitize ? "paragraph" : "html",
        pre: cap[1] === "pre" || cap[1] === "script",
        text: cap[0]
      });
      continue;
    }

    // def
    if (top && (cap = this.rules.def.exec(src))) {
      src = src.substring(cap[0].length);
      this.tokens.links[cap[1].toLowerCase()] = {
        href: cap[2],
        title: cap[3]
      };
      continue;
    }

    // table (gfm)
    if (top && (cap = this.rules.table.exec(src))) {
      src = src.substring(cap[0].length);

      item = {
        type: "table",
        header: cap[1].replace(/^ *| *\| *$/g, "").split(/ *\| */),
        align: cap[2].replace(/^ *|\| *$/g, "").split(/ *\| */),
        cells: cap[3].replace(/(?: *\| *)?\n$/, "").split("\n")
      };

      for (i = 0; i < item.align.length; i++) {
        if (/^ *-+: *$/.test(item.align[i])) {
          item.align[i] = "right";
        } else if (/^ *:-+: *$/.test(item.align[i])) {
          item.align[i] = "center";
        } else if (/^ *:-+ *$/.test(item.align[i])) {
          item.align[i] = "left";
        } else {
          item.align[i] = null;
        }
      }

      for (i = 0; i < item.cells.length; i++) {
        item.cells[i] = item.cells[i]
          .replace(/^ *\| *| *\| *$/g, "")
          .split(/ *\| */);
      }

      this.tokens.push(item);

      continue;
    }

    // top-level paragraph
    if (top && (cap = this.rules.paragraph.exec(src))) {
      src = src.substring(cap[0].length);
      this.tokens.push({
        type: "paragraph",
        text: cap[1][cap[1].length - 1] === "\n" ? cap[1].slice(0, -1) : cap[1]
      });
      continue;
    }

    // text
    if ((cap = this.rules.text.exec(src))) {
      // Top-level should never reach here.
      src = src.substring(cap[0].length);
      this.tokens.push({
        type: "text",
        text: cap[0]
      });
      continue;
    }

    if (src) {
      throw new Error("Infinite loop on byte: " + src.charCodeAt(0));
    }
  }

  return this.tokens;
};

/**
 * Inline-Level Grammar
 */

const inline = {
  escape: /^\\([\\`*{}\[\]()#+\-.!_>])/,
  autolink: /^<([^ >]+(@|:\/)[^ >]+)>/,
  url: noop,
  tag: /^<!--[\s\S]*?-->|^<\/?\w+(?:"[^"]*"|'[^']*'|[^'">])*?>/,
  link: /^!?\[(inside)\]\(href\)/,
  reflink: /^!?\[(inside)\]\s*\[([^\]]*)\]/,
  nolink: /^!?\[((?:\[[^\]]*\]|[^\[\]])*)\]/,
  strong: /^__([\s\S]+?)__(?!_)|^\*\*([\s\S]+?)\*\*(?!\*)/,
  em: /^\b_((?:__|[\s\S])+?)_\b|^\*((?:\*\*|[\s\S])+?)\*(?!\*)/,
  code: /^(`+)\s*([\s\S]*?[^`])\s*\1(?!`)/,
  br: /^ {2,}\n(?!\s*$)/,
  del: noop,
  text: /^[\s\S]+?(?=[\\<!\[_*`]| {2,}\n|$)/
};

inline._inside = /(?:\[[^\]]*\]|[^\]]|\](?=[^\[]*\]))*/;
inline._href = /\s*<?([^\s]*?)>?(?:\s+['"]([\s\S]*?)['"])?\s*/;

inline.link = replace(inline.link)("inside", inline._inside)(
  "href",
  inline._href
)();

inline.reflink = replace(inline.reflink)("inside", inline._inside)();

/**
 * Normal Inline Grammar
 */

inline.normal = merge({}, inline);

/**
 * Pedantic Inline Grammar
 */

inline.pedantic = merge({}, inline.normal, {
  strong: /^__(?=\S)([\s\S]*?\S)__(?!_)|^\*\*(?=\S)([\s\S]*?\S)\*\*(?!\*)/,
  em: /^_(?=\S)([\s\S]*?\S)_(?!_)|^\*(?=\S)([\s\S]*?\S)\*(?!\*)/
});

/**
 * GFM Inline Grammar
 */

inline.gfm = merge({}, inline.normal, {
  escape: replace(inline.escape)("])", "~|])")(),
  url: /^(https?:\/\/[^\s<]+[^<.,:;"')\]\s])/,
  del: /^~~(?=\S)([\s\S]*?\S)~~/,
  text: replace(inline.text)("]|", "~]|")("|", "|https?://|")()
});

/**
 * GFM + Line Breaks Inline Grammar
 */

inline.breaks = merge({}, inline.gfm, {
  br: replace(inline.br)("{2,}", "*")(),
  text: replace(inline.gfm.text)("{2,}", "*")()
});

/**
 * Inline Lexer & Compiler
 */

function InlineLexer(links, options) {
  this.options = options || marked.defaults;
  this.links = links;
  this.rules = inline.normal;

  if (!this.links) {
    throw new Error("Tokens array requires a `links` property.");
  }

  if (this.options.gfm) {
    if (this.options.breaks) {
      this.rules = inline.breaks;
    } else {
      this.rules = inline.gfm;
    }
  } else if (this.options.pedantic) {
    this.rules = inline.pedantic;
  }
}

/**
 * Expose Inline Rules
 */

InlineLexer.rules = inline;

/**
 * Static Lexing/Compiling Method
 */

InlineLexer.output = function(src, links, options) {
  const inline = new InlineLexer(links, options);
  return inline.output(src);
};

/**
 * Lexing/Compiling
 */

InlineLexer.prototype.output = function(src) {
  const out = [];
  let link;
  let text;
  let href;
  let cap;

  while (src) {
    // escape
    if ((cap = this.rules.escape.exec(src))) {
      src = src.substring(cap[0].length);
      out.push(cap[1]);
      continue;
    }

    // autolink
    if ((cap = this.rules.autolink.exec(src))) {
      src = src.substring(cap[0].length);
      if (cap[2] === "@") {
        text = cap[1][6] === ":" ? cap[1].substring(7) : cap[1];
        href = "mailto:" + text;
      } else {
        text = cap[1];
        href = text;
      }
      out.push(React.DOM.a({ href: this.sanitizeUrl(href) }, text));
      continue;
    }

    // url (gfm)
    if ((cap = this.rules.url.exec(src))) {
      src = src.substring(cap[0].length);
      text = cap[1];
      href = text;
      out.push(React.DOM.a({ href: this.sanitizeUrl(href) }, text));
      continue;
    }

    // tag
    if ((cap = this.rules.tag.exec(src))) {
      src = src.substring(cap[0].length);
      // TODO(alpert): Don't escape if sanitize is false
      out.push(cap[0]);
      continue;
    }

    // link
    if ((cap = this.rules.link.exec(src))) {
      src = src.substring(cap[0].length);
      out.push(
        this.outputLink(cap, {
          href: cap[2],
          title: cap[3]
        })
      );
      continue;
    }

    // reflink, nolink
    if (
      (cap = this.rules.reflink.exec(src)) ||
      (cap = this.rules.nolink.exec(src))
    ) {
      src = src.substring(cap[0].length);
      link = (cap[2] || cap[1]).replace(/\s+/g, " ");
      link = this.links[link.toLowerCase()];
      if (!link || !link.href) {
        out.push.apply(out, this.output(cap[0][0]));
        src = cap[0].substring(1) + src;
        continue;
      }
      out.push(this.outputLink(cap, link));
      continue;
    }

    // strong
    if ((cap = this.rules.strong.exec(src))) {
      src = src.substring(cap[0].length);
      out.push(React.DOM.strong(null, this.output(cap[2] || cap[1])));
      continue;
    }

    // em
    if ((cap = this.rules.em.exec(src))) {
      src = src.substring(cap[0].length);
      out.push(React.DOM.em(null, this.output(cap[2] || cap[1])));
      continue;
    }

    // code
    if ((cap = this.rules.code.exec(src))) {
      src = src.substring(cap[0].length);
      out.push(React.DOM.code(null, cap[2]));
      continue;
    }

    // br
    if ((cap = this.rules.br.exec(src))) {
      src = src.substring(cap[0].length);
      out.push(React.DOM.br(null, null));
      continue;
    }

    // del (gfm)
    if ((cap = this.rules.del.exec(src))) {
      src = src.substring(cap[0].length);
      out.push(React.DOM.del(null, this.output(cap[1])));
      continue;
    }

    // text
    if ((cap = this.rules.text.exec(src))) {
      src = src.substring(cap[0].length);
      out.push(this.smartypants(cap[0]));
      continue;
    }

    if (src) {
      throw new Error("Infinite loop on byte: " + src.charCodeAt(0));
    }
  }

  return out;
};

/**
 * Sanitize a URL for a link or image
 */

InlineLexer.prototype.sanitizeUrl = function(url) {
  if (this.options.sanitize) {
    try {
      const prot = decodeURIComponent(url)
        .replace(/[^A-Za-z0-9:]/g, "")
        .toLowerCase();
      if (prot.indexOf("javascript:") === 0) {
        // eslint-disable-line
        return "#";
      }
    } catch (e) {
      return "#";
    }
  }
  return url;
};

/**
 * Compile Link
 */

InlineLexer.prototype.outputLink = function(cap, link) {
  if (cap[0][0] !== "!") {
    const shouldOpenInNewWindow =
      link.href.charAt(0) !== "/" && link.href.charAt(0) !== "#";

    return React.DOM.a(
      {
        href: this.sanitizeUrl(link.href),
        title: link.title,
        target: shouldOpenInNewWindow ? "_blank" : ""
      },
      this.output(cap[1])
    );
  } else {
    return React.DOM.img(
      {
        src: this.sanitizeUrl(link.href),
        alt: cap[1],
        title: link.title
      },
      null
    );
  }
};

/**
 * Smartypants Transformations
 */

InlineLexer.prototype.smartypants = function(text) {
  if (!this.options.smartypants) {
    return text;
  }
  return text
    .replace(/--/g, "\u2014")
    .replace(/'([^']*)'/g, "\u2018$1\u2019")
    .replace(/"([^"]*)"/g, "\u201C$1\u201D")
    .replace(/\.{3}/g, "\u2026");
};

/**
 * Parsing & Compiling
 */

function Parser(options) {
  this.tokens = [];
  this.token = null;
  this.options = options || marked.defaults;
}

/**
 * Static Parse Method
 */

Parser.parse = function(src, options) {
  const parser = new Parser(options);
  return parser.parse(src);
};

/**
 * Parse Loop
 */

Parser.prototype.parse = function(src) {
  this.inline = new InlineLexer(src.links, this.options);
  this.tokens = src.reverse();

  const out = [];
  while (this.next()) {
    out.push(this.tok());
  }

  return out;
};

/**
 * Next Token
 */

Parser.prototype.next = function() {
  return (this.token = this.tokens.pop());
};

/**
 * Preview Next Token
 */

Parser.prototype.peek = function() {
  return this.tokens[this.tokens.length - 1] || 0;
};

/**
 * Parse Text Tokens
 */

Parser.prototype.parseText = function() {
  let body = this.token.text;

  while (this.peek().type === "text") {
    body += "\n" + this.next().text;
  }

  return this.inline.output(body);
};

/**
 * Parse Current Token
 */

Parser.prototype.tok = function() {
  // eslint-disable-line
  switch (this.token.type) {
    case "space": {
      return [];
    }
    case "hr": {
      return React.DOM.hr(null, null);
    }
    case "heading": {
      return (
        <Header level={this.token.depth} toSlug={this.token.text}>
          {this.inline.output(this.token.text)}
        </Header>
      );
    }
    case "code": {
      return (
        <Prism>
          {this.token.text}
        </Prism>
      );
    }
    case "table": {
      const table = [];
      const body = [];
      let row = [];
      let heading;
      let i;
      let cells;
      let j;

      // header
      for (i = 0; i < this.token.header.length; i++) {
        heading = this.inline.output(this.token.header[i]);
        row.push(
          React.DOM.th(
            this.token.align[i]
              ? { style: { textAlign: this.token.align[i] } }
              : null,
            heading
          )
        );
      }
      table.push(React.DOM.thead(null, React.DOM.tr(null, row)));

      // body
      for (i = 0; i < this.token.cells.length; i++) {
        row = [];
        cells = this.token.cells[i];
        for (j = 0; j < cells.length; j++) {
          row.push(
            React.DOM.td(
              this.token.align[j]
                ? { style: { textAlign: this.token.align[j] } }
                : null,
              this.inline.output(cells[j])
            )
          );
        }
        body.push(React.DOM.tr(null, row));
      }
      table.push(React.DOM.thead(null, body));

      return React.DOM.table(null, table);
    }
    case "blockquote_start": {
      const body = [];

      while (this.next().type !== "blockquote_end") {
        body.push(this.tok());
      }

      return React.DOM.blockquote(null, body);
    }
    case "list_start": {
      const type = this.token.ordered ? "ol" : "ul";
      const body = [];

      while (this.next().type !== "list_end") {
        body.push(this.tok());
      }

      return React.DOM[type](null, body);
    }
    case "list_item_start": {
      const body = [];

      while (this.next().type !== "list_item_end") {
        body.push(this.token.type === "text" ? this.parseText() : this.tok());
      }

      return React.DOM.li(null, body);
    }
    case "loose_item_start": {
      const body = [];

      while (this.next().type !== "list_item_end") {
        body.push(this.tok());
      }

      return React.DOM.li(null, body);
    }
    case "html": {
      return React.DOM.div({
        dangerouslySetInnerHTML: {
          __html: this.token.text
        }
      });
    }
    case "paragraph": {
      return this.options.paragraphFn
        ? this.options.paragraphFn.call(
            null,
            this.inline.output(this.token.text)
          )
        : React.DOM.p(null, this.inline.output(this.token.text));
    }
    case "text": {
      return this.options.paragraphFn
        ? this.options.paragraphFn.call(null, this.parseText())
        : React.DOM.p(null, this.parseText());
    }
  }
};

/**
 * Helpers
 */

function replace(regex, opt) {
  regex = regex.source;
  opt = opt || "";
  return function self(name, val) {
    if (!name) {
      return new RegExp(regex, opt);
    }
    val = val.source || val;
    val = val.replace(/(^|[^\[])\^/g, "$1");
    regex = regex.replace(name, val);
    return self;
  };
}

function noop() {}
noop.exec = noop;

function merge(obj) {
  let i = 1;
  let target;
  let key;

  for (; i < arguments.length; i++) {
    target = arguments[i];
    for (key in target) {
      if (Object.prototype.hasOwnProperty.call(target, key)) {
        obj[key] = target[key];
      }
    }
  }

  return obj;
}

/**
 * Marked
 */

function marked(src, opt, callback) {
  if (callback || typeof opt === "function") {
    if (!callback) {
      callback = opt;
      opt = null;
    }

    if (opt) {
      opt = merge({}, marked.defaults, opt);
    }

    const highlight = opt.highlight;
    let tokens;
    let pending;
    let i = 0;

    try {
      tokens = Lexer.lex(src, opt);
    } catch (e) {
      return callback(e);
    }

    pending = tokens.length;

    const done = function(hi) {
      let out, err;

      if (hi !== true) {
        delete opt.highlight;
      }

      try {
        out = Parser.parse(tokens, opt);
      } catch (e) {
        err = e;
      }

      opt.highlight = highlight;

      return err ? callback(err) : callback(null, out);
    };

    if (!highlight || highlight.length < 3) {
      return done(true);
    }

    if (!pending) {
      return done();
    }

    for (; i < tokens.length; i++) {
      (function(token) {
        if (token.type !== "code") {
          return --pending || done();
        }
        return highlight(token.text, token.lang, (err, code) => {
          if (code == null || code === token.text) {
            return --pending || done();
          }
          token.text = code;
          token.escaped = true;
          --pending || done();
          return undefined;
        });
      })(tokens[i]);
    }

    return undefined;
  }
  try {
    if (opt) {
      opt = merge({}, marked.defaults, opt);
    }
    return Parser.parse(Lexer.lex(src, opt), opt);
  } catch (e) {
    e.message += "\nPlease report this to https://github.com/chjj/marked.";
    if ((opt || marked.defaults).silent) {
      return [
        React.DOM.p(null, "An error occurred:"),
        React.DOM.pre(null, e.message)
      ];
    }
    throw e;
  }
}

/**
 * Options
 */

marked.options = marked.setOptions = function(opt) {
  merge(marked.defaults, opt);
  return marked;
};

marked.defaults = {
  gfm: true,
  tables: true,
  breaks: false,
  pedantic: false,
  sanitize: false,
  smartLists: false,
  silent: false,
  highlight: null,
  langPrefix: "lang-",
  smartypants: false,
  paragraphFn: null
};

/**
 * Expose
 */

marked.Parser = Parser;
marked.parser = Parser.parse;

marked.Lexer = Lexer;
marked.lexer = Lexer.lex;

marked.InlineLexer = InlineLexer;
marked.inlineLexer = InlineLexer.output;

marked.parse = marked;

class Marked extends React.Component {
  render() {
    return (
      <div>
        {marked(this.props.children, this.props)}
      </div>
    );
  }
}

module.exports = Marked;