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terminal-cv/node_modules/htmlnano/lib/modules/removeRedundantAttributes.js

165 lines
5.2 KiB

"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = removeRedundantAttributes;
exports.redundantScriptTypes = void 0;
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types#JavaScript_types
const redundantScriptTypes = new Set(['application/javascript', 'application/ecmascript', 'application/x-ecmascript', 'application/x-javascript', 'text/javascript', 'text/ecmascript', 'text/javascript1.0', 'text/javascript1.1', 'text/javascript1.2', 'text/javascript1.3', 'text/javascript1.4', 'text/javascript1.5', 'text/jscript', 'text/livescript', 'text/x-ecmascript', 'text/x-javascript']);
exports.redundantScriptTypes = redundantScriptTypes;
const redundantAttributes = {
'form': {
'method': 'get'
},
'input': {
'type': 'text'
},
'button': {
'type': 'submit'
},
'script': {
'language': 'javascript',
'type': node => {
for (const [attrName, attrValue] of Object.entries(node.attrs)) {
if (attrName.toLowerCase() !== 'type') {
continue;
}
return redundantScriptTypes.has(attrValue);
}
return false;
},
// Remove attribute if the function returns false
'charset': node => {
// The charset attribute only really makes sense on “external” SCRIPT elements:
// http://perfectionkills.com/optimizing-html/#8_script_charset
return node.attrs && !node.attrs.src;
}
},
'style': {
'media': 'all',
'type': 'text/css'
},
'link': {
'media': 'all',
'type': node => {
// https://html.spec.whatwg.org/multipage/links.html#link-type-stylesheet
let isRelStyleSheet = false;
let isTypeTextCSS = false;
if (node.attrs) {
for (const [attrName, attrValue] of Object.entries(node.attrs)) {
if (attrName.toLowerCase() === 'rel' && attrValue === 'stylesheet') {
isRelStyleSheet = true;
}
if (attrName.toLowerCase() === 'type' && attrValue === 'text/css') {
isTypeTextCSS = true;
}
}
} // Only "text/css" is redudant for link[rel=stylesheet]. Otherwise "type" shouldn't be removed
return isRelStyleSheet && isTypeTextCSS;
}
},
// See: https://html.spec.whatwg.org/#lazy-loading-attributes
'img': {
'loading': 'eager'
},
'iframe': {
'loading': 'eager'
}
}; // See: https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#missing-value-default
const canBeReplacedWithEmptyStringAttributes = {
audio: {
// https://html.spec.whatwg.org/#attr-media-preload
preload: 'auto'
},
video: {
preload: 'auto'
},
form: {
// https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#autofilling-form-controls:-the-autocomplete-attribute
autocomplete: 'on'
},
img: {
// https://html.spec.whatwg.org/multipage/embedded-content.html#dom-img-decoding
decoding: 'auto'
},
track: {
// https://html.spec.whatwg.org/multipage/media.html#htmltrackelement
kind: 'subtitles'
},
textarea: {
// https://html.spec.whatwg.org/multipage/form-elements.html#dom-textarea-wrap
wrap: 'soft'
},
area: {
// https://html.spec.whatwg.org/multipage/image-maps.html#attr-area-shape
shape: 'rect'
},
button: {
// https://html.spec.whatwg.org/multipage/form-elements.html#attr-button-type
type: 'submit'
},
input: {
// https://html.spec.whatwg.org/multipage/input.html#states-of-the-type-attribute
type: 'text'
}
};
const tagsHaveRedundantAttributes = new Set(Object.keys(redundantAttributes));
const tagsHaveMissingValueDefaultAttributes = new Set(Object.keys(canBeReplacedWithEmptyStringAttributes));
/** Removes redundant attributes */
function removeRedundantAttributes(tree) {
tree.walk(node => {
if (!node.tag) {
return node;
}
node.attrs = node.attrs || {};
if (tagsHaveRedundantAttributes.has(node.tag)) {
const tagRedundantAttributes = redundantAttributes[node.tag];
for (const redundantAttributeName of Object.keys(tagRedundantAttributes)) {
let tagRedundantAttributeValue = tagRedundantAttributes[redundantAttributeName];
let isRemove = false;
if (typeof tagRedundantAttributeValue === 'function') {
isRemove = tagRedundantAttributeValue(node);
} else if (node.attrs[redundantAttributeName] === tagRedundantAttributeValue) {
isRemove = true;
}
if (isRemove) {
delete node.attrs[redundantAttributeName];
}
}
}
if (tagsHaveMissingValueDefaultAttributes.has(node.tag)) {
const tagMissingValueDefaultAttributes = canBeReplacedWithEmptyStringAttributes[node.tag];
for (const canBeReplacedWithEmptyStringAttributeName of Object.keys(tagMissingValueDefaultAttributes)) {
let tagMissingValueDefaultAttribute = tagMissingValueDefaultAttributes[canBeReplacedWithEmptyStringAttributeName];
let isReplace = false;
if (node.attrs[canBeReplacedWithEmptyStringAttributeName] === tagMissingValueDefaultAttribute) {
isReplace = true;
}
if (isReplace) {
node.attrs[canBeReplacedWithEmptyStringAttributeName] = '';
}
}
}
return node;
});
return tree;
}