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to-markdown

An HTML to Markdown converter written in JavaScript.

This script should not be not be installed directly. It is a library for other scripts to include with the meta directive // @require https://update.greasyfork.org/scripts/432248/1041130/to-markdown.js 

// ==UserScript==
// @name         toMarkdown
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  to Markdown
// @author       You
// @include      *
// @run-at       context-menu
// ==/UserScript==

(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.toMarkdown = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
/*
 * to-markdown - an HTML to Markdown converter
 *
 * Copyright 2011+, Dom Christie
 * Licenced under the MIT licence
 *
 */

'use strict'

var toMarkdown
var converters
var mdConverters = require('./lib/md-converters')
var gfmConverters = require('./lib/gfm-converters')
var HtmlParser = require('./lib/html-parser')
var collapse = require('collapse-whitespace')

/*
 * Utilities
 */

var blocks = ['address', 'article', 'aside', 'audio', 'blockquote', 'body',
  'canvas', 'center', 'dd', 'dir', 'div', 'dl', 'dt', 'fieldset', 'figcaption',
  'figure', 'footer', 'form', 'frameset', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6',
  'header', 'hgroup', 'hr', 'html', 'isindex', 'li', 'main', 'menu', 'nav',
  'noframes', 'noscript', 'ol', 'output', 'p', 'pre', 'section', 'table',
  'tbody', 'td', 'tfoot', 'th', 'thead', 'tr', 'ul'
]

function isBlock (node) {
  return blocks.indexOf(node.nodeName.toLowerCase()) !== -1
}

var voids = [
  'area', 'base', 'br', 'col', 'command', 'embed', 'hr', 'img', 'input',
  'keygen', 'link', 'meta', 'param', 'source', 'track', 'wbr'
]

function isVoid (node) {
  return voids.indexOf(node.nodeName.toLowerCase()) !== -1
}

function htmlToDom (string) {
  var tree = new HtmlParser().parseFromString(string, 'text/html')
  collapse(tree.documentElement, isBlock)
  return tree
}

/*
 * Flattens DOM tree into single array
 */

function bfsOrder (node) {
  var inqueue = [node]
  var outqueue = []
  var elem
  var children
  var i

  while (inqueue.length > 0) {
    elem = inqueue.shift()
    outqueue.push(elem)
    children = elem.childNodes
    for (i = 0; i < children.length; i++) {
      if (children[i].nodeType === 1) inqueue.push(children[i])
    }
  }
  outqueue.shift()
  return outqueue
}

/*
 * Contructs a Markdown string of replacement text for a given node
 */

function getContent (node) {
  var text = ''
  for (var i = 0; i < node.childNodes.length; i++) {
    if (node.childNodes[i].nodeType === 1) {
      text += node.childNodes[i]._replacement
    } else if (node.childNodes[i].nodeType === 3) {
      text += node.childNodes[i].data
    } else continue
  }
  return text
}

/*
 * Returns the HTML string of an element with its contents converted
 */

function outer (node, content) {
  return node.cloneNode(false).outerHTML.replace('><', '>' + content + '<')
}

function canConvert (node, filter) {
  if (typeof filter === 'string') {
    return filter === node.nodeName.toLowerCase()
  }
  if (Array.isArray(filter)) {
    return filter.indexOf(node.nodeName.toLowerCase()) !== -1
  } else if (typeof filter === 'function') {
    return filter.call(toMarkdown, node)
  } else {
    throw new TypeError('`filter` needs to be a string, array, or function')
  }
}

function isFlankedByWhitespace (side, node) {
  var sibling
  var regExp
  var isFlanked

  if (side === 'left') {
    sibling = node.previousSibling
    regExp = / $/
  } else {
    sibling = node.nextSibling
    regExp = /^ /
  }

  if (sibling) {
    if (sibling.nodeType === 3) {
      isFlanked = regExp.test(sibling.nodeValue)
    } else if (sibling.nodeType === 1 && !isBlock(sibling)) {
      isFlanked = regExp.test(sibling.textContent)
    }
  }
  return isFlanked
}

function flankingWhitespace (node) {
  var leading = ''
  var trailing = ''

  if (!isBlock(node)) {
    var hasLeading = /^[ \r\n\t]/.test(node.innerHTML)
    var hasTrailing = /[ \r\n\t]$/.test(node.innerHTML)

    if (hasLeading && !isFlankedByWhitespace('left', node)) {
      leading = ' '
    }
    if (hasTrailing && !isFlankedByWhitespace('right', node)) {
      trailing = ' '
    }
  }

  return { leading: leading, trailing: trailing }
}

/*
 * Finds a Markdown converter, gets the replacement, and sets it on
 * `_replacement`
 */

function process (node) {
  var replacement
  var content = getContent(node)

  // Remove blank nodes
  if (!isVoid(node) && !/A|TH|TD/.test(node.nodeName) && /^\s*$/i.test(content)) {
    node._replacement = ''
    return
  }

  for (var i = 0; i < converters.length; i++) {
    var converter = converters[i]

    if (canConvert(node, converter.filter)) {
      if (typeof converter.replacement !== 'function') {
        throw new TypeError(
          '`replacement` needs to be a function that returns a string'
        )
      }

      var whitespace = flankingWhitespace(node)

      if (whitespace.leading || whitespace.trailing) {
        content = content.trim()
      }
      replacement = whitespace.leading +
        converter.replacement.call(toMarkdown, content, node) +
        whitespace.trailing
      break
    }
  }

  node._replacement = replacement
}

toMarkdown = function (input, options) {
  options = options || {}

  if (typeof input !== 'string') {
    throw new TypeError(input + ' is not a string')
  }

  // Escape potential ol triggers
  input = input.replace(/(>[\r\n\s]*)(\d+)\.(&nbsp;| )/g, '$1$2\\.$3')

  var clone = htmlToDom(input).body
  var nodes = bfsOrder(clone)
  var output

  converters = mdConverters.slice(0)
  if (options.gfm) {
    converters = gfmConverters.concat(converters)
  }

  if (options.converters) {
    converters = options.converters.concat(converters)
  }

  // Process through nodes in reverse (so deepest child elements are first).
  for (var i = nodes.length - 1; i >= 0; i--) {
    process(nodes[i])
  }
  output = getContent(clone)

  return output.replace(/^[\t\r\n]+|[\t\r\n\s]+$/g, '')
    .replace(/\n\s+\n/g, '\n\n')
    .replace(/\n{3,}/g, '\n\n')
}

toMarkdown.isBlock = isBlock
toMarkdown.isVoid = isVoid
toMarkdown.outer = outer

module.exports = toMarkdown

},{"./lib/gfm-converters":2,"./lib/html-parser":3,"./lib/md-converters":4,"collapse-whitespace":7}],2:[function(require,module,exports){
'use strict'

function cell (content, node) {
  var index = Array.prototype.indexOf.call(node.parentNode.childNodes, node)
  var prefix = ' '
  if (index === 0) prefix = '| '
  return prefix + content + ' |'
}

var highlightRegEx = /highlight highlight-(\S+)/

module.exports = [
  {
    filter: 'br',
    replacement: function () {
      return '\n'
    }
  },
  {
    filter: ['del', 's', 'strike'],
    replacement: function (content) {
      return '~~' + content + '~~'
    }
  },

  {
    filter: function (node) {
      return node.type === 'checkbox' && node.parentNode.nodeName === 'LI'
    },
    replacement: function (content, node) {
      return (node.checked ? '[x]' : '[ ]') + ' '
    }
  },

  {
    filter: ['th', 'td'],
    replacement: function (content, node) {
      return cell(content, node)
    }
  },

  {
    filter: 'tr',
    replacement: function (content, node) {
      var borderCells = ''
      var alignMap = { left: ':--', right: '--:', center: ':-:' }

      if (node.parentNode.nodeName === 'THEAD') {
        for (var i = 0; i < node.childNodes.length; i++) {
          var align = node.childNodes[i].attributes.align
          var border = '---'

          if (align) border = alignMap[align.value] || border

          borderCells += cell(border, node.childNodes[i])
        }
      }
      return '\n' + content + (borderCells ? '\n' + borderCells : '')
    }
  },

  {
    filter: 'table',
    replacement: function (content) {
      return '\n\n' + content + '\n\n'
    }
  },

  {
    filter: ['thead', 'tbody', 'tfoot'],
    replacement: function (content) {
      return content
    }
  },

  // Fenced code blocks
  {
    filter: function (node) {
      return node.nodeName === 'PRE' &&
      node.firstChild &&
      node.firstChild.nodeName === 'CODE'
    },
    replacement: function (content, node) {
      return '\n\n```\n' + node.firstChild.textContent + '\n```\n\n'
    }
  },

  // Syntax-highlighted code blocks
  {
    filter: function (node) {
      return node.nodeName === 'PRE' &&
      node.parentNode.nodeName === 'DIV' &&
      highlightRegEx.test(node.parentNode.className)
    },
    replacement: function (content, node) {
      var language = node.parentNode.className.match(highlightRegEx)[1]
      return '\n\n```' + language + '\n' + node.textContent + '\n```\n\n'
    }
  },

  {
    filter: function (node) {
      return node.nodeName === 'DIV' &&
      highlightRegEx.test(node.className)
    },
    replacement: function (content) {
      return '\n\n' + content + '\n\n'
    }
  }
]

},{}],3:[function(require,module,exports){
/*
 * Set up window for Node.js
 */

var _window = (typeof window !== 'undefined' ? window : this)

/*
 * Parsing HTML strings
 */

function canParseHtmlNatively () {
  var Parser = _window.DOMParser
  var canParse = false

  // Adapted from https://gist.github.com/1129031
  // Firefox/Opera/IE throw errors on unsupported types
  try {
    // WebKit returns null on unsupported types
    if (new Parser().parseFromString('', 'text/html')) {
      canParse = true
    }
  } catch (e) {}

  return canParse
}

function createHtmlParser () {
  var Parser = function () {}

  // For Node.js environments
  if (typeof document === 'undefined') {
    var jsdom = require('jsdom')
    Parser.prototype.parseFromString = function (string) {
      return jsdom.jsdom(string, {
        features: {
          FetchExternalResources: [],
          ProcessExternalResources: false
        }
      })
    }
  } else {
    if (!shouldUseActiveX()) {
      Parser.prototype.parseFromString = function (string) {
        var doc = document.implementation.createHTMLDocument('')
        doc.open()
        doc.write(string)
        doc.close()
        return doc
      }
    } else {
      Parser.prototype.parseFromString = function (string) {
        var doc = new window.ActiveXObject('htmlfile')
        doc.designMode = 'on' // disable on-page scripts
        doc.open()
        doc.write(string)
        doc.close()
        return doc
      }
    }
  }
  return Parser
}

function shouldUseActiveX () {
  var useActiveX = false

  try {
    document.implementation.createHTMLDocument('').open()
  } catch (e) {
    if (window.ActiveXObject) useActiveX = true
  }

  return useActiveX
}

module.exports = canParseHtmlNatively() ? _window.DOMParser : createHtmlParser()

},{"jsdom":6}],4:[function(require,module,exports){
'use strict'

module.exports = [
  {
    filter: 'p',
    replacement: function (content) {
      return '\n\n' + content + '\n\n'
    }
  },

  {
    filter: 'br',
    replacement: function () {
      return '  \n'
    }
  },

  {
    filter: ['h1', 'h2', 'h3', 'h4', 'h5', 'h6'],
    replacement: function (content, node) {
      var hLevel = node.nodeName.charAt(1)
      var hPrefix = ''
      for (var i = 0; i < hLevel; i++) {
        hPrefix += '#'
      }
      return '\n\n' + hPrefix + ' ' + content + '\n\n'
    }
  },

  {
    filter: 'hr',
    replacement: function () {
      return '\n\n* * *\n\n'
    }
  },

  {
    filter: ['em', 'i'],
    replacement: function (content) {
      return '_' + content + '_'
    }
  },

  {
    filter: ['strong', 'b'],
    replacement: function (content) {
      return '**' + content + '**'
    }
  },

  // Inline code
  {
    filter: function (node) {
      var hasSiblings = node.previousSibling || node.nextSibling
      var isCodeBlock = node.parentNode.nodeName === 'PRE' && !hasSiblings

      return node.nodeName === 'CODE' && !isCodeBlock
    },
    replacement: function (content) {
      return '`' + content + '`'
    }
  },

  {
    filter: function (node) {
      return node.nodeName === 'A' && node.getAttribute('href')
    },
    replacement: function (content, node) {
      var titlePart = node.title ? ' "' + node.title + '"' : ''
      return '[' + content + '](' + node.getAttribute('href') + titlePart + ')'
    }
  },

  {
    filter: 'img',
    replacement: function (content, node) {
      var alt = node.alt || ''
      var src = node.getAttribute('src') || ''
      var title = node.title || ''
      var titlePart = title ? ' "' + title + '"' : ''
      return src ? '![' + alt + ']' + '(' + src + titlePart + ')' : ''
    }
  },

  // Code blocks
  {
    filter: function (node) {
      return node.nodeName === 'PRE' && node.firstChild.nodeName === 'CODE'
    },
    replacement: function (content, node) {
      return '\n\n    ' + node.firstChild.textContent.replace(/\n/g, '\n    ') + '\n\n'
    }
  },

  {
    filter: 'blockquote',
    replacement: function (content) {
      content = content.trim()
      content = content.replace(/\n{3,}/g, '\n\n')
      content = content.replace(/^/gm, '> ')
      return '\n\n' + content + '\n\n'
    }
  },

  {
    filter: 'li',
    replacement: function (content, node) {
      content = content.replace(/^\s+/, '').replace(/\n/gm, '\n    ')
      var prefix = '*   '
      var parent = node.parentNode
      var index = Array.prototype.indexOf.call(parent.children, node) + 1

      prefix = /ol/i.test(parent.nodeName) ? index + '.  ' : '*   '
      return prefix + content
    }
  },

  {
    filter: ['ul', 'ol'],
    replacement: function (content, node) {
      var strings = []
      for (var i = 0; i < node.childNodes.length; i++) {
        strings.push(node.childNodes[i]._replacement)
      }

      if (/li/i.test(node.parentNode.nodeName)) {
        return '\n' + strings.join('\n')
      }
      return '\n\n' + strings.join('\n') + '\n\n'
    }
  },

  {
    filter: function (node) {
      return this.isBlock(node)
    },
    replacement: function (content, node) {
      // return '\n\n' + this.outer(node, content) + '\n\n'
      return '\n\n' + content + '\n\n'
    }
  },

  // Anything else!
  {
    filter: function () {
      return true
    },
    replacement: function (content, node) {
      // return this.outer(node, content)
      return content
    }
  }
]

},{}],5:[function(require,module,exports){
/**
 * This file automatically generated from `build.js`.
 * Do not manually edit.
 */

module.exports = [
  "address",
  "article",
  "aside",
  "audio",
  "blockquote",
  "canvas",
  "dd",
  "div",
  "dl",
  "fieldset",
  "figcaption",
  "figure",
  "footer",
  "form",
  "h1",
  "h2",
  "h3",
  "h4",
  "h5",
  "h6",
  "header",
  "hgroup",
  "hr",
  "main",
  "nav",
  "noscript",
  "ol",
  "output",
  "p",
  "pre",
  "section",
  "table",
  "tfoot",
  "ul",
  "video"
];

},{}],6:[function(require,module,exports){

},{}],7:[function(require,module,exports){
'use strict';

var voidElements = require('void-elements');
Object.keys(voidElements).forEach(function (name) {
  voidElements[name.toUpperCase()] = 1;
});

var blockElements = {};
require('block-elements').forEach(function (name) {
  blockElements[name.toUpperCase()] = 1;
});

/**
 * isBlockElem(node) determines if the given node is a block element.
 *
 * @param {Node} node
 * @return {Boolean}
 */
function isBlockElem(node) {
  return !!(node && blockElements[node.nodeName]);
}

/**
 * isVoid(node) determines if the given node is a void element.
 *
 * @param {Node} node
 * @return {Boolean}
 */
function isVoid(node) {
  return !!(node && voidElements[node.nodeName]);
}

/**
 * whitespace(elem [, isBlock]) removes extraneous whitespace from an
 * the given element. The function isBlock may optionally be passed in
 * to determine whether or not an element is a block element; if none
 * is provided, defaults to using the list of block elements provided
 * by the `block-elements` module.
 *
 * @param {Node} elem
 * @param {Function} blockTest
 */
function collapseWhitespace(elem, isBlock) {
  if (!elem.firstChild || elem.nodeName === 'PRE') return;

  if (typeof isBlock !== 'function') {
    isBlock = isBlockElem;
  }

  var prevText = null;
  var prevVoid = false;

  var prev = null;
  var node = next(prev, elem);

  while (node !== elem) {
    if (node.nodeType === 3) {
      // Node.TEXT_NODE
      var text = node.data.replace(/[ \r\n\t]+/g, ' ');

      if ((!prevText || / $/.test(prevText.data)) && !prevVoid && text[0] === ' ') {
        text = text.substr(1);
      }

      // `text` might be empty at this point.
      if (!text) {
        node = remove(node);
        continue;
      }

      node.data = text;
      prevText = node;
    } else if (node.nodeType === 1) {
      // Node.ELEMENT_NODE
      if (isBlock(node) || node.nodeName === 'BR') {
        if (prevText) {
          prevText.data = prevText.data.replace(/ $/, '');
        }

        prevText = null;
        prevVoid = false;
      } else if (isVoid(node)) {
        // Avoid trimming space around non-block, non-BR void elements.
        prevText = null;
        prevVoid = true;
      }
    } else {
      node = remove(node);
      continue;
    }

    var nextNode = next(prev, node);
    prev = node;
    node = nextNode;
  }

  if (prevText) {
    prevText.data = prevText.data.replace(/ $/, '');
    if (!prevText.data) {
      remove(prevText);
    }
  }
}

/**
 * remove(node) removes the given node from the DOM and returns the
 * next node in the sequence.
 *
 * @param {Node} node
 * @return {Node} node
 */
function remove(node) {
  var next = node.nextSibling || node.parentNode;

  node.parentNode.removeChild(node);

  return next;
}

/**
 * next(prev, current) returns the next node in the sequence, given the
 * current and previous nodes.
 *
 * @param {Node} prev
 * @param {Node} current
 * @return {Node}
 */
function next(prev, current) {
  if (prev && prev.parentNode === current || current.nodeName === 'PRE') {
    return current.nextSibling || current.parentNode;
  }

  return current.firstChild || current.nextSibling || current.parentNode;
}

module.exports = collapseWhitespace;

},{"block-elements":5,"void-elements":8}],8:[function(require,module,exports){
/**
 * This file automatically generated from `pre-publish.js`.
 * Do not manually edit.
 */

module.exports = {
  "area": true,
  "base": true,
  "br": true,
  "col": true,
  "embed": true,
  "hr": true,
  "img": true,
  "input": true,
  "keygen": true,
  "link": true,
  "menuitem": true,
  "meta": true,
  "param": true,
  "source": true,
  "track": true,
  "wbr": true
};

},{}]},{},[1])(1)
});