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hast-util-to-dom.js
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hast-util-to-dom.js
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/*
* (ISC License)
*
* Copyright (c) 2018 Keith McKnight <keith@mcknig.ht>
*
* Permission to use, copy, modify, and/or distribute this software for any purpose
* with or without fee is hereby granted, provided that the above copyright notice
* and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
* THIS SOFTWARE.
*/
// This was copied from https://github.com/syntax-tree/hast-util-to-dom/blob/master/src/index.js
// and adapted so that it can be used with JSDOM
// TODO: contribute back to original
/* eslint-disable header/header */
const ns = require('web-namespaces');
const info = require('property-information');
/* istanbul ignore next */
const wrap = (document) => {
// Add all children.
function appendAll(node, children, options) {
const childrenLength = children.length;
for (let i = 0; i < childrenLength; i += 1) {
// eslint-disable-next-line no-use-before-define
node.appendChild(transform(children[i], options));
}
return node;
}
// Create a document.
function root(node, options) {
const { fragment, namespace: optionsNamespace } = options;
const { children = [] } = node;
const { length: childrenLength } = children;
let namespace = optionsNamespace;
let rootIsDocument = childrenLength === 0;
for (let i = 0; i < childrenLength; i += 1) {
const { tagName, properties = {} } = children[i];
if (tagName === 'html') {
// If we have a root HTML node, we don’t need to render as a fragment.
rootIsDocument = true;
// Take namespace of the first child.
if (typeof optionsNamespace === 'undefined') {
namespace = properties.xmlns || ns.html;
}
}
}
// The root node will be a Document, DocumentFragment, or HTMLElement.
let el;
if (rootIsDocument) {
el = document.implementation.createDocument(namespace, '', null);
} else if (fragment) {
el = document.createDocumentFragment();
} else {
el = document.createElement('html');
}
return appendAll(el, children, { fragment, namespace, ...options });
}
// Create a `doctype`.
function doctype(node) {
return document.implementation.createDocumentType(
node.name || 'html',
node.public || '',
node.system || '',
);
}
// Create a `text`.
function text(node) {
return document.createTextNode(node.value);
}
// Create a `comment`.
function comment(node) {
return document.createComment(node.value);
}
// Create an `element`.
function element(node, options) {
const { namespace } = options;
// TODO: use `g` in SVG space.
const { tagName = 'div', properties = {}, children = [] } = node;
const el = typeof namespace !== 'undefined'
? document.createElementNS(namespace, tagName)
: document.createElement(tagName);
// Add HTML attributes.
const props = Object.keys(properties);
const { length } = props;
for (let i = 0; i < length; i += 1) {
const key = props[i];
const {
attribute,
property,
// `mustUseAttribute`,
mustUseProperty,
boolean,
booleanish,
overloadedBoolean,
// `number`,
// `defined`,
commaSeparated,
// `spaceSeparated`,
// `commaOrSpaceSeparated`,
} = info.find(info.html, key);
let value = properties[key];
if (Array.isArray(value)) {
value = value.join(commaSeparated ? ', ' : ' ');
}
if (mustUseProperty) {
el[property] = value;
}
if (boolean || (overloadedBoolean && typeof value === 'boolean')) {
if (value) {
el.setAttribute(attribute, '');
} else {
el.removeAttribute(attribute);
}
} else if (booleanish) {
el.setAttribute(attribute, value);
} else if (value === true) {
el.setAttribute(attribute, '');
} else if (value || value === 0 || value === '') {
el.setAttribute(attribute, value);
}
}
return appendAll(el, children, options);
}
// the raw node is stored in the value directly
function raw(node) {
return node.value;
}
function transform(node, options) {
switch (node.type) {
case 'root':
return root(node, options);
case 'text':
return text(node);
case 'element':
return element(node, options);
case 'doctype':
return doctype(node);
case 'comment':
return comment(node);
case 'raw':
return raw(node);
default:
return element(node, options);
}
}
return transform;
};
module.exports = function toDOM(document, hast, options = {}) {
return wrap(document)(hast, options);
};