htmlnano
Version:
Modular HTML minifier, built on top of the PostHTML
217 lines (214 loc) • 3.7 kB
JavaScript
import { isEventHandler } from '../helpers.mjs';
const safeToRemoveAttrs = {
id: null,
class: null,
style: null,
title: null,
lang: null,
dir: null,
abbr: [
'th'
],
accept: [
'input'
],
'accept-charset': [
'form'
],
charset: [
'meta',
'script'
],
action: [
'form'
],
cols: [
'textarea'
],
colspan: [
'td',
'th'
],
coords: [
'area'
],
dirname: [
'input',
'textarea'
],
dropzone: null,
headers: [
'td',
'th'
],
form: [
'button',
'fieldset',
'input',
'keygen',
'object',
'output',
'select',
'textarea'
],
formaction: [
'button',
'input'
],
height: [
'canvas',
'embed',
'iframe',
'img',
'input',
'object',
'video'
],
high: [
'meter'
],
href: [
'link'
],
list: [
'input'
],
low: [
'meter'
],
manifest: [
'html'
],
max: [
'meter',
'progress'
],
maxlength: [
'input',
'textarea'
],
menu: [
'button'
],
min: [
'meter'
],
minlength: [
'input',
'textarea'
],
name: [
'button',
'fieldset',
'input',
'keygen',
'output',
'select',
'textarea',
'form',
'map',
'meta',
'param',
'slot'
],
pattern: [
'input'
],
ping: [
'a',
'area'
],
placeholder: [
'input',
'textarea'
],
poster: [
'video'
],
rel: [
'a',
'area',
'link'
],
rows: [
'textarea'
],
rowspan: [
'td',
'th'
],
size: [
'input',
'select'
],
span: [
'col',
'colgroup'
],
src: [
'audio',
'embed',
'iframe',
'img',
'input',
'script',
'source',
'track',
'video'
],
start: [
'ol'
],
tabindex: null,
type: [
'a',
'link',
'button',
'embed',
'object',
'script',
'source',
'style',
'input',
'menu',
'menuitem',
'ol'
],
value: [
'button',
'input',
'li'
],
width: [
'canvas',
'embed',
'iframe',
'img',
'input',
'object',
'video'
]
};
const mod = {
onAttrs () {
return (attrs, node)=>{
const newAttrs = {
...attrs
};
const tagName = typeof node.tag === 'string' ? node.tag.toLowerCase() : '';
Object.entries(attrs).forEach(([attrName, attrValue])=>{
const normalizedAttrName = attrName.toLowerCase();
const safeAttr = safeToRemoveAttrs[normalizedAttrName];
if (isEventHandler(attrName) || safeAttr !== undefined && (safeAttr === null || tagName && safeAttr.includes(tagName))) {
if (attrValue === null || attrValue === undefined) {
delete newAttrs[attrName];
} else if (typeof attrValue === 'string' && attrValue.trim() === '') {
delete newAttrs[attrName];
}
}
});
return newAttrs;
};
}
};
export { mod as default };