NPF-to-HTML renderer

00-README.md

npf.js is the main bulk of the code, and it exposes three functions:

renderContent

Render content returns an object {content, ask}. It returns the ask content separately so it can be handled spearately by the consuming client. content is an HTML element, ask is itself an object containing content (an HTML element) and the other properties of the ask layout type (specifically of interest is the attribution property).

mentions

media

you probably don't need these. These functions extract a useful type of thing from the NPF tree for additional processing, but they're not part of rendering it to HTML.

---

dom.js is a lightweight DOM library, similar in spirit to jsdom but much less interesting. npf.js was originally written on the client side, and then I moved it to node but wanted to use the same DOM APIs. You should probably rewrite it to use Nokogiri or something instead. I also can't garauntee that npf.js will actually work on the front-end anymore, I probably changed some stuff in porting it that I don't remember right now.

01-npf.js

const {createElement, renderHtml} = require('./dom');
const {keyBy, max, flatMap} = require('lodash');

const renderContent = ({content: blocks, layout}) => {
  const content = [];
  const {rows, condensed, ask} = keyBy(layout, 'type');

  const truncate_after = condensed && (condensed.truncate_after || max(condensed.blocks));
  let askContent, details;

  const renderRow = ({blocks: blockIndexes, mode}) => {
    const elements = blockIndexes.map(i => renderBlock(blocks[i]));

    if (elements.length !== 1) {
      return [createElement('div').tap(row => {
        row.style.display = 'flex';
        mode && (row.classList = `row-${mode.type}`);
        row.append(...elements);
      })];
    } else {
      return elements;
    }
  };

  normalizeRows(rows, blocks).forEach(row => {
    if (ask && row.blocks.find(i => ask.blocks.includes(i)) !== undefined) {
      askContent = askContent || [];
      askContent.push(...renderRow(row));
    } else if (row.blocks.find(i => i > truncate_after) !== undefined) {
      details = details || createElement('details').tap(d => {
        d.append(createElement('summary').tap(s => s.textContent = 'Read More'));
        content.push(d);
      });
      details.append(...renderRow(row));
    } else {
      content.push(...renderRow(row));
    }
  });

  return {
    content: renderHtml(content),
    ask: (askContent && {content: renderHtml(askContent), ...ask}),
  };
};

const normalizeRows = (rows, blocks) => {
  if (!rows) {
    return blocks.map((_, i) => ({blocks: [i]}));
  } else if (!rows.display) {
    return rows.rows.map(indexes => ({blocks: indexes}));
  } else {
    return rows.display;
  }
};

const blockRenderers = {
  text({subtype, text, formatting}) {
    const element = createElement(({
      heading1: 'h2',
      heading2: 'h3',
      quirky: 'marquee',
      quote: 'blockquote',
      indented: 'blockquote',
      chat: 'pre',
      'ordered-list-item': 'li',
      'unordered-list-item': 'li',
    })[subtype] || 'p');

    element.append(...applyFormatting({text, formatting}));
    element.style.whiteSpace = 'pre-wrap';

    return element;
  },

  image({alt_text, media}) {
    return createElement('figure').tap(figure => {
      figure.style.margin = 0;
      figure.append(createElement('img').tap(img => {
        alt_text && (img.alt = img.title = alt_text);
        img.srcset = media.filter(m => !m.cropped).
          map(m => `${m.url} ${m.width}w`).join(',\n');
        const [largestWidthMedia] = media.sort(descendBy(i => i.width));
        img.src = largestWidthMedia.url;
        img.style.width = '100%';
      }));
    });
  },

  link({url, title, description}) {
    return createElement('a').tap(a => {
      a.href = url;
      a.style.display = 'block';
      a.style.border = '1px dashed';
      a.style.padding = '0.5em';
      a.append(createElement('h3').tap(h => {
        h.append(title);
        h.style.margin = '0 0 0.5em';
      }));
      a.append(description);
    });
  },

  audio({media, provider, embed_html, url, title, artist}) {
    if (media && provider === 'tumblr') {
      return createElement('audio').tap(audio => {
        audio.src = media.url;
        audio.controls = true;
        audio.style.width = '100%';
      });
    } else if (media && provider === 'bandcamp') {
      const embed_params = {
        size: 'medium',
        bgcol: 'ffffff',
        linkcol: '0687f5',
        notracklist: 'true',
        transparent: 'true',
        track: /track_id=(\d+)/.exec(media.url)[1],
      };

      return createElement('iframe').tap(iframe => {
        iframe.src = `https://bandcamp.com/EmbeddedPlayer/${
          Object.entries(embed_params).map(p => p.join('=')).join('/')
        }/`;
        iframe.width = '100%';
        iframe.height = '120';
        iframe.frameborder = '0';
        iframe.allowtransparency = true;
        iframe.append(createElement('a').tap(link => {
          link.href = url;
          link.append(`${title} by ${artist}`);
        }));
      });
    } else if (embed_html) {
      return {__html: embed_html};
    } else {
      return createElement('a').tap(a => {
        a.href = url;
        a.append('(audio)');
      });
    }
  },

  video({media, embed_html, url, poster}) {
    if (media) {
      return createElement('figure').tap(f => {
        f.append(createElement('video').tap(video => {
          video.src = media.url;
          video.controls = true;
          video.loop = true;
          poster && (video.poster = poster[0].url);
          video.style.width = '100%';
        }));
        f.style.margin = 0;
      });
    } else if (embed_html) {
      return {__html: embed_html};
    } else {
      return createElement('a').tap(a => {
        a.href = url;
        a.append('(video)');
      });
    }
  },
};

const renderBlock = block => blockRenderers[block.type](block);

const applyFormatting = ({text, formatting = []}) => {
  if (!formatting.length) {
    return [text];
  }

  const tokens = [];
  const length = f => f.end - f.start;
  formatting.sort(ascendBy(length)).forEach(format => {
    tokens.unshift(['start', format.start, format]);
    tokens.push(['end', format.end, format]);
  });
  tokens.sort(ascendBy(([, index]) => index));

  const output = createElement('span');
  let currentString = [...text];
  let currentStringOffset = 0;

  const elementStack = [output];
  const currentElement = () => elementStack[elementStack.length - 1];

  tokens.forEach(([tokenType, tokenIndex, tokenFormat]) => {
    const [beforeString, afterString] = splitArray(
      currentString,
      tokenIndex - currentStringOffset
    );
    currentString = afterString;
    currentStringOffset = tokenIndex;

    if (tokenType === 'start') {
      const newElement = renderFormatting(tokenFormat);
      newElement.format = tokenFormat;
      currentElement().append(beforeString.join(''), newElement);
      elementStack.push(newElement);
    } else if (tokenType === 'end') {
      currentElement().append(beforeString.join(''));

      const formattingsToReopen = [];
      let element;
      while (element = elementStack.pop()) {
        if (element.format === tokenFormat) {
          break;
        } else {
          formattingsToReopen.push(element.format);
        }
      }

      let format;
      while (format = formattingsToReopen.pop()) {
        const newElement = renderFormatting(format);
        newElement.format = format;
        currentElement().append(newElement);
        elementStack.push(newElement);
      }
    }
  });

  output.append(currentString.join(''));

  return [...output.children];
};

const formatRenderers = {
  bold: () => createElement('strong'),
  italic: () => createElement('em'),
  strikethrough: () => createElement('s'),
  link: ({url}) => createElement('a').tap(a => {
    a.href = url;
  }),
  mention: ({blog: {url}}) => createElement('a').tap(a => {
    a.href = url;
    a.classList.push('h-card', 'mention');
  }),
  color: ({hex}) => createElement('font').tap(font => {
    font.color = hex;
  }),
  default: () => createElement('span'),
};

const renderFormatting = format =>
  (formatRenderers[format.type] || formatRenderers.default)(format);

const ascendBy = (...funcs) => (negativeFirstItem, postiveFirstItem) => {
  for (const func of funcs) {
    const negativeFirstValue = func(negativeFirstItem);
    const positiveFirstValue = func(postiveFirstItem);
    if (negativeFirstValue < positiveFirstValue) {
      return -1;
    } else if (positiveFirstValue < negativeFirstValue) {
      return 1;
    }
  }

  return 0;
};

const descendBy = (...funcs) => ascendBy(...funcs.map(func => i => -func(i)));

const splitArray = (array, index) => [
  array.slice(0, index),
  array.slice(index),
];

const mentions = blocks => flatMap(blocks,
  i => i.formatting && i.formatting.filter(f => f.type === 'mention')
).filter(i => i);

const extractMedia = blocks => blocks.map(({media, type, alt_text}) => {
  if (type === 'image') {
    return {
      ...(media.sort(descendBy(i => i.width))[0]),
      alt_text,
    };
  } else if (type === 'video') {
    return media;
  } else if (type === 'audio') {
    return media;
  }
}).filter(i => i);

module.exports = {renderContent, mentions, media: extractMedia};

02-dom.js

const {omit, escape: lodashEscape, kebabCase} = require('lodash');

const css = obj => Object.entries(obj).map(([k, v]) => `${kebabCase(k)}: ${v}`).join('; ');
const escape = text => lodashEscape(text).replace(''', "'");

const NON_ATTRIBUTE_PROPERTIES = [
  'tag', 'children', 'style', 'classList', 'format',
];
class Element {
  constructor(tag) {
    this.tag = tag;
    this.children = [];
    this.style = {};
    this.classList = [];
  }

  append(...elements) {
    this.children.push(...elements);
  }

  toString() {
    const attributes = {
      ...omit(this, NON_ATTRIBUTE_PROPERTIES),
      style: css(this.style),
      class: this.classList.join(' '),
    };

    const tag = [
      this.tag,
      ...Object.entries(attributes).
        filter(([_, v]) => v).
        map(([k, v]) => `${k}="${escape(v)}"`),
    ];

    return `<${tag.join(' ')}>${renderHtml(this.children)}</${this.tag}>`;
  }

  toJSON() {
    return this.toString();
  }
}

const createElement = tag => new Element(tag);
const renderHtml = array => array && array.map(i =>
  !i ? escape(i) :
  i.tag ? i.toString() :
  i.__html ? i.__html :
  escape(i)
).join('');

module.exports = {createElement, renderHtml};

04-LICENSE

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  8. Termination.

  You may not propagate or modify a covered work except as expressly
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  However, if you cease all violation of this License, then your
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  Moreover, your license from a particular copyright holder is
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  Termination of your rights under this section does not terminate the
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  9. Acceptance Not Required for Having Copies.

  You are not required to accept this License in order to receive or
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  10. Automatic Licensing of Downstream Recipients.

  Each time you convey a covered work, the recipient automatically
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  You may not impose any further restrictions on the exercise of the
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  11. Patents.

  A "contributor" is a copyright holder who authorizes use under this
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  In the following three paragraphs, a "patent license" is any express
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  If you convey a covered work, knowingly relying on a patent license,
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  If, pursuant to or in connection with a single transaction or
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  A patent license is "discriminatory" if it does not include within
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or that patent license was granted, prior to 28 March 2007.

  Nothing in this License shall be construed as excluding or limiting
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otherwise be available to you under applicable patent law.

  12. No Surrender of Others' Freedom.

  If conditions are imposed on you (whether by court order, agreement or
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  13. Remote Network Interaction; Use with the GNU General Public License.

  Notwithstanding any other provision of this License, if you modify the
Program, your modified version must prominently offer all users
interacting with it remotely through a computer network (if your version
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of the GNU General Public License that is incorporated pursuant to the
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  Notwithstanding any other provision of this License, you have
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but the work with which it is combined will remain governed by version
3 of the GNU General Public License.

  14. Revised Versions of this License.

  The Free Software Foundation may publish revised and/or new versions of
the GNU Affero General Public License from time to time.  Such new versions
will be similar in spirit to the present version, but may differ in detail to
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  Each version is given a distinguishing version number.  If the
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Foundation.  If the Program does not specify a version number of the
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by the Free Software Foundation.

  If the Program specifies that a proxy can decide which future
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to choose that version for the Program.

  Later license versions may give you additional or different
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  15. Disclaimer of Warranty.

  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
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  16. Limitation of Liability.

  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.

  17. Interpretation of Sections 15 and 16.

  If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.