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| 'use strict'
const is = require( '@mojule/is' )
const nodeUtils = require( '@mojule/node-utils' )
const { walk, removeAll } = nodeUtils
const select = ( node, selector ) => {
if( node.nodeType === 1 && node.matches( selector ) )
return node
return node.querySelector( selector )
}
const selectAll = ( node, selector ) => {
const result = []
if( node.nodeType === 1 && node.matches( selector ) )
result.push( node )
const results = Array.from( node.querySelectorAll( selector ) )
return result.concat( results )
}
const isWhitespaceNode = node =>
node.nodeType === 3 && node.nodeValue.replace( /[\t\n\r ]/g, '' ).length === 0
const removeWhitespace = node => {
const remove = []
walk( node, current => {
if( current.nodeType !== 3 ) return
if( !isWhitespaceNode( current ) ) return
remove.push( current )
})
remove.forEach( current => current.parentNode.removeChild( current ) )
}
//needs to be modified to leave whitespace alone in pre, script, textarea etc
const normalizeWhitespace = node => {
node.normalize()
walk( node, current => {
if( current.nodeType !== 3 ) return
current.nodeValue = current.nodeValue.replace( /[\t\n\r ]+/g, ' ' )
})
}
const parse = ( document, str ) => {
const fragment = document.createDocumentFragment()
const temp = document.createElement( 'div' )
temp.innerHTML = str
if( temp.childNodes.length === 1 )
return temp.removeChild( temp.firstChild )
while( temp.firstChild )
fragment.appendChild( temp.firstChild )
return fragment
}
const parseDocument = ( document, str ) => {
const doc = createEmptyDocument( document )
const docType = document.implementation.createDocumentType( 'html', '', '' )
const { documentElement } = document.implementation.createHTMLDocument( '' )
documentElement.innerHTML = str
doc.appendChild( docType )
doc.appendChild( documentElement )
return doc
}
const stringify = node => {
if( node.nodeType === 1 ) return node.outerHTML
if( node.nodeType === 3 ) return node.nodeValue
if( node.nodeType === 8 ) return `<!--${ node.nodeValue }-->`
// force HTML5 doctypes - for now
if( node.nodeType === 10 ) return '<!doctype html>'
return [ ...node.childNodes ].map( stringify ).join( '' )
}
const getAttributes = element => {
const attributes = {}
const { length } = element.attributes
for( let i = 0; i < length; i++ ){
const { name, value } = element.attributes[ i ]
attributes[ name ] = value
}
return attributes
}
const setAttributes = ( element, attributes ) =>
Object.keys( attributes ).forEach( name => {
element.setAttribute( name, attributes[ name ] )
})
const createEmptyDocument = document => {
const doc = document.implementation.createDocument( 'http://www.w3.org/1999/xhtml', 'html' )
removeAll( doc )
return doc
}
const serializeChildren = node => [ ...node.childNodes ].map( serialize )
const serialize = node => {
if( node.nodeType === 1 ){
const tagName = node.tagName.toLowerCase()
if( node.hasAttributes() )
return [ tagName, getAttributes( node ), ...serializeChildren( node ) ]
return [ tagName, ...serializeChildren( node ) ]
}
if( node.nodeType === 3 ) return node.nodeValue
if( node.nodeType === 8 ) return [ node.nodeName, node.nodeValue ]
if( node.nodeType === 10 ) return [
'#document-type', node.name, node.publicId, node.systemId
]
if( node.hasChildNodes() )
return [ node.nodeName, ...serializeChildren( node ) ]
throw Error( 'Unexpected node' )
}
const deserialize = ( document, value ) => {
if( is.string( value ) )
return document.createTextNode( value )
if( !is.array( value ) )
throw Error( 'Expected the serialized node to be a string or array' )
const nodeName = value[ 0 ]
if( !nodeName.startsWith( '#' ) ){
const element = document.createElement( nodeName )
for( let i = 1; i < value.length; i++ ){
const current = value[ i ]
if( is.object( current ) ){
setAttributes( element, current )
} else {
element.appendChild( deserialize( document, current ) )
}
}
return element
}
const args = value.slice( 1 )
if( nodeName === '#comment' )
return document.createComment( ...args )
if( nodeName === '#document-type' )
return document.implementation.createDocumentType( ...args )
if( nodeName === '#document' ){
const doc = createEmptyDocument( document )
args.forEach( current =>
doc.appendChild( deserialize( document, current ) )
)
return doc
}
if( nodeName === '#document-fragment' ){
const fragment = document.createDocumentFragment()
args.forEach( current =>
fragment.appendChild( deserialize( document, current ) )
)
return fragment
}
throw Error( 'Unexpected node' )
}
const eachAttribute = ( node, callback ) => {
const { attributes } = node
const { length } = attributes
for( let i = 0; i < length; i++ ){
if( callback( attributes[ i ], i ) ) break
}
}
const rename = ( document, node, tagName ) => {
const tag = document.createElement( tagName )
while( node.firstChild )
tag.appendChild( node.firstChild )
eachAttribute( node, attribute => {
const { name, value } = attribute
tag.setAttribute( name, value )
})
node.parentNode.insertBefore( tag, node )
node.parentNode.removeChild( node )
return tag
}
const empty = node => {
const removed = []
while( node.firstChild )
removed.push( node.removeChild( node.firstChild ) )
return removed
}
const domUtils = {
select, selectAll, isWhitespaceNode, removeWhitespace, normalizeWhitespace,
parse, parseDocument, stringify, getAttributes, setAttributes,
createEmptyDocument, serialize, deserialize, eachAttribute, rename, empty
}
const utils = Object.assign( {}, nodeUtils, domUtils )
module.exports = utils
|