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htmlminifier.js
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htmlminifier.js
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import CleanCSS from 'clean-css';
import { decodeHTMLStrict, decodeHTML } from 'entities';
import RelateURL from 'relateurl';
import { minify as terser } from 'terser';
import { HTMLParser, endTag } from './htmlparser.js';
import TokenChain from './tokenchain.js';
import { replaceAsync } from './utils.js';
function trimWhitespace(str) {
return str && str.replace(/^[ \n\r\t\f]+/, '').replace(/[ \n\r\t\f]+$/, '');
}
function collapseWhitespaceAll(str) {
// Non-breaking space is specifically handled inside the replacer function here:
return str && str.replace(/[ \n\r\t\f\xA0]+/g, function (spaces) {
return spaces === '\t' ? '\t' : spaces.replace(/(^|\xA0+)[^\xA0]+/g, '$1 ');
});
}
function collapseWhitespace(str, options, trimLeft, trimRight, collapseAll) {
let lineBreakBefore = ''; let lineBreakAfter = '';
if (options.preserveLineBreaks) {
str = str.replace(/^[ \n\r\t\f]*?[\n\r][ \n\r\t\f]*/, function () {
lineBreakBefore = '\n';
return '';
}).replace(/[ \n\r\t\f]*?[\n\r][ \n\r\t\f]*$/, function () {
lineBreakAfter = '\n';
return '';
});
}
if (trimLeft) {
// Non-breaking space is specifically handled inside the replacer function here:
str = str.replace(/^[ \n\r\t\f\xA0]+/, function (spaces) {
const conservative = !lineBreakBefore && options.conservativeCollapse;
if (conservative && spaces === '\t') {
return '\t';
}
return spaces.replace(/^[^\xA0]+/, '').replace(/(\xA0+)[^\xA0]+/g, '$1 ') || (conservative ? ' ' : '');
});
}
if (trimRight) {
// Non-breaking space is specifically handled inside the replacer function here:
str = str.replace(/[ \n\r\t\f\xA0]+$/, function (spaces) {
const conservative = !lineBreakAfter && options.conservativeCollapse;
if (conservative && spaces === '\t') {
return '\t';
}
return spaces.replace(/[^\xA0]+(\xA0+)/g, ' $1').replace(/[^\xA0]+$/, '') || (conservative ? ' ' : '');
});
}
if (collapseAll) {
// strip non space whitespace then compress spaces to one
str = collapseWhitespaceAll(str);
}
return lineBreakBefore + str + lineBreakAfter;
}
// non-empty tags that will maintain whitespace around them
const inlineTags = new Set(['a', 'abbr', 'acronym', 'b', 'bdi', 'bdo', 'big', 'button', 'cite', 'code', 'del', 'dfn', 'em', 'font', 'i', 'ins', 'kbd', 'label', 'mark', 'math', 'nobr', 'object', 'q', 'rp', 'rt', 'rtc', 'ruby', 's', 'samp', 'select', 'small', 'span', 'strike', 'strong', 'sub', 'sup', 'svg', 'textarea', 'time', 'tt', 'u', 'var']);
// non-empty tags that will maintain whitespace within them
const inlineTextTags = new Set(['a', 'abbr', 'acronym', 'b', 'big', 'del', 'em', 'font', 'i', 'ins', 'kbd', 'mark', 'nobr', 'rp', 's', 'samp', 'small', 'span', 'strike', 'strong', 'sub', 'sup', 'time', 'tt', 'u', 'var']);
// self-closing tags that will maintain whitespace around them
const selfClosingInlineTags = new Set(['comment', 'img', 'input', 'wbr']);
function collapseWhitespaceSmart(str, prevTag, nextTag, options) {
let trimLeft = prevTag && !selfClosingInlineTags.has(prevTag);
if (trimLeft && !options.collapseInlineTagWhitespace) {
trimLeft = prevTag.charAt(0) === '/' ? !inlineTags.has(prevTag.slice(1)) : !inlineTextTags.has(prevTag);
}
let trimRight = nextTag && !selfClosingInlineTags.has(nextTag);
if (trimRight && !options.collapseInlineTagWhitespace) {
trimRight = nextTag.charAt(0) === '/' ? !inlineTextTags.has(nextTag.slice(1)) : !inlineTags.has(nextTag);
}
return collapseWhitespace(str, options, trimLeft, trimRight, prevTag && nextTag);
}
function isConditionalComment(text) {
return /^\[if\s[^\]]+]|\[endif]$/.test(text);
}
function isIgnoredComment(text, options) {
for (let i = 0, len = options.ignoreCustomComments.length; i < len; i++) {
if (options.ignoreCustomComments[i].test(text)) {
return true;
}
}
return false;
}
function isEventAttribute(attrName, options) {
const patterns = options.customEventAttributes;
if (patterns) {
for (let i = patterns.length; i--;) {
if (patterns[i].test(attrName)) {
return true;
}
}
return false;
}
return /^on[a-z]{3,}$/.test(attrName);
}
function canRemoveAttributeQuotes(value) {
// https://mathiasbynens.be/notes/unquoted-attribute-values
return /^[^ \t\n\f\r"'`=<>]+$/.test(value);
}
function attributesInclude(attributes, attribute) {
for (let i = attributes.length; i--;) {
if (attributes[i].name.toLowerCase() === attribute) {
return true;
}
}
return false;
}
function isAttributeRedundant(tag, attrName, attrValue, attrs) {
attrValue = attrValue ? trimWhitespace(attrValue.toLowerCase()) : '';
return (
(tag === 'script' &&
attrName === 'language' &&
attrValue === 'javascript') ||
(tag === 'form' &&
attrName === 'method' &&
attrValue === 'get') ||
(tag === 'input' &&
attrName === 'type' &&
attrValue === 'text') ||
(tag === 'script' &&
attrName === 'charset' &&
!attributesInclude(attrs, 'src')) ||
(tag === 'a' &&
attrName === 'name' &&
attributesInclude(attrs, 'id')) ||
(tag === 'area' &&
attrName === 'shape' &&
attrValue === 'rect')
);
}
// https://mathiasbynens.be/demo/javascript-mime-type
// https://developer.mozilla.org/en/docs/Web/HTML/Element/script#attr-type
const executableScriptsMimetypes = new Set([
'text/javascript',
'text/ecmascript',
'text/jscript',
'application/javascript',
'application/x-javascript',
'application/ecmascript',
'module'
]);
const keepScriptsMimetypes = new Set([
'module'
]);
function isScriptTypeAttribute(attrValue = '') {
attrValue = trimWhitespace(attrValue.split(/;/, 2)[0]).toLowerCase();
return attrValue === '' || executableScriptsMimetypes.has(attrValue);
}
function keepScriptTypeAttribute(attrValue = '') {
attrValue = trimWhitespace(attrValue.split(/;/, 2)[0]).toLowerCase();
return keepScriptsMimetypes.has(attrValue);
}
function isExecutableScript(tag, attrs) {
if (tag !== 'script') {
return false;
}
for (let i = 0, len = attrs.length; i < len; i++) {
const attrName = attrs[i].name.toLowerCase();
if (attrName === 'type') {
return isScriptTypeAttribute(attrs[i].value);
}
}
return true;
}
function isStyleLinkTypeAttribute(attrValue = '') {
attrValue = trimWhitespace(attrValue).toLowerCase();
return attrValue === '' || attrValue === 'text/css';
}
function isStyleSheet(tag, attrs) {
if (tag !== 'style') {
return false;
}
for (let i = 0, len = attrs.length; i < len; i++) {
const attrName = attrs[i].name.toLowerCase();
if (attrName === 'type') {
return isStyleLinkTypeAttribute(attrs[i].value);
}
}
return true;
}
const isSimpleBoolean = new Set(['allowfullscreen', 'async', 'autofocus', 'autoplay', 'checked', 'compact', 'controls', 'declare', 'default', 'defaultchecked', 'defaultmuted', 'defaultselected', 'defer', 'disabled', 'enabled', 'formnovalidate', 'hidden', 'indeterminate', 'inert', 'ismap', 'itemscope', 'loop', 'multiple', 'muted', 'nohref', 'noresize', 'noshade', 'novalidate', 'nowrap', 'open', 'pauseonexit', 'readonly', 'required', 'reversed', 'scoped', 'seamless', 'selected', 'sortable', 'truespeed', 'typemustmatch', 'visible']);
const isBooleanValue = new Set(['true', 'false']);
function isBooleanAttribute(attrName, attrValue) {
return isSimpleBoolean.has(attrName) || (attrName === 'draggable' && !isBooleanValue.has(attrValue));
}
function isUriTypeAttribute(attrName, tag) {
return (
(/^(?:a|area|link|base)$/.test(tag) && attrName === 'href') ||
(tag === 'img' && /^(?:src|longdesc|usemap)$/.test(attrName)) ||
(tag === 'object' && /^(?:classid|codebase|data|usemap)$/.test(attrName)) ||
(tag === 'q' && attrName === 'cite') ||
(tag === 'blockquote' && attrName === 'cite') ||
((tag === 'ins' || tag === 'del') && attrName === 'cite') ||
(tag === 'form' && attrName === 'action') ||
(tag === 'input' && (attrName === 'src' || attrName === 'usemap')) ||
(tag === 'head' && attrName === 'profile') ||
(tag === 'script' && (attrName === 'src' || attrName === 'for'))
);
}
function isNumberTypeAttribute(attrName, tag) {
return (
(/^(?:a|area|object|button)$/.test(tag) && attrName === 'tabindex') ||
(tag === 'input' && (attrName === 'maxlength' || attrName === 'tabindex')) ||
(tag === 'select' && (attrName === 'size' || attrName === 'tabindex')) ||
(tag === 'textarea' && /^(?:rows|cols|tabindex)$/.test(attrName)) ||
(tag === 'colgroup' && attrName === 'span') ||
(tag === 'col' && attrName === 'span') ||
((tag === 'th' || tag === 'td') && (attrName === 'rowspan' || attrName === 'colspan'))
);
}
function isLinkType(tag, attrs, value) {
if (tag !== 'link') {
return false;
}
for (let i = 0, len = attrs.length; i < len; i++) {
if (attrs[i].name === 'rel' && attrs[i].value === value) {
return true;
}
}
}
function isMediaQuery(tag, attrs, attrName) {
return attrName === 'media' && (isLinkType(tag, attrs, 'stylesheet') || isStyleSheet(tag, attrs));
}
const srcsetTags = new Set(['img', 'source']);
function isSrcset(attrName, tag) {
return attrName === 'srcset' && srcsetTags.has(tag);
}
async function cleanAttributeValue(tag, attrName, attrValue, options, attrs) {
if (isEventAttribute(attrName, options)) {
attrValue = trimWhitespace(attrValue).replace(/^javascript:\s*/i, '');
return options.minifyJS(attrValue, true);
} else if (attrName === 'class') {
attrValue = trimWhitespace(attrValue);
if (options.sortClassName) {
attrValue = options.sortClassName(attrValue);
} else {
attrValue = collapseWhitespaceAll(attrValue);
}
return attrValue;
} else if (isUriTypeAttribute(attrName, tag)) {
attrValue = trimWhitespace(attrValue);
return isLinkType(tag, attrs, 'canonical') ? attrValue : options.minifyURLs(attrValue);
} else if (isNumberTypeAttribute(attrName, tag)) {
return trimWhitespace(attrValue);
} else if (attrName === 'style') {
attrValue = trimWhitespace(attrValue);
if (attrValue) {
if (/;$/.test(attrValue) && !/&#?[0-9a-zA-Z]+;$/.test(attrValue)) {
attrValue = attrValue.replace(/\s*;$/, ';');
}
attrValue = await options.minifyCSS(attrValue, 'inline');
}
return attrValue;
} else if (isSrcset(attrName, tag)) {
// https://html.spec.whatwg.org/multipage/embedded-content.html#attr-img-srcset
attrValue = trimWhitespace(attrValue).split(/\s+,\s*|\s*,\s+/).map(function (candidate) {
let url = candidate;
let descriptor = '';
const match = candidate.match(/\s+([1-9][0-9]*w|[0-9]+(?:\.[0-9]+)?x)$/);
if (match) {
url = url.slice(0, -match[0].length);
const num = +match[1].slice(0, -1);
const suffix = match[1].slice(-1);
if (num !== 1 || suffix !== 'x') {
descriptor = ' ' + num + suffix;
}
}
return options.minifyURLs(url) + descriptor;
}).join(', ');
} else if (isMetaViewport(tag, attrs) && attrName === 'content') {
attrValue = attrValue.replace(/\s+/g, '').replace(/[0-9]+\.[0-9]+/g, function (numString) {
// "0.90000" -> "0.9"
// "1.0" -> "1"
// "1.0001" -> "1.0001" (unchanged)
return (+numString).toString();
});
} else if (isContentSecurityPolicy(tag, attrs) && attrName.toLowerCase() === 'content') {
return collapseWhitespaceAll(attrValue);
} else if (options.customAttrCollapse && options.customAttrCollapse.test(attrName)) {
attrValue = trimWhitespace(attrValue.replace(/ ?[\n\r]+ ?/g, '').replace(/\s{2,}/g, options.conservativeCollapse ? ' ' : ''));
} else if (tag === 'script' && attrName === 'type') {
attrValue = trimWhitespace(attrValue.replace(/\s*;\s*/g, ';'));
} else if (isMediaQuery(tag, attrs, attrName)) {
attrValue = trimWhitespace(attrValue);
return options.minifyCSS(attrValue, 'media');
}
return attrValue;
}
function isMetaViewport(tag, attrs) {
if (tag !== 'meta') {
return false;
}
for (let i = 0, len = attrs.length; i < len; i++) {
if (attrs[i].name === 'name' && attrs[i].value === 'viewport') {
return true;
}
}
}
function isContentSecurityPolicy(tag, attrs) {
if (tag !== 'meta') {
return false;
}
for (let i = 0, len = attrs.length; i < len; i++) {
if (attrs[i].name.toLowerCase() === 'http-equiv' && attrs[i].value.toLowerCase() === 'content-security-policy') {
return true;
}
}
}
function ignoreCSS(id) {
return '/* clean-css ignore:start */' + id + '/* clean-css ignore:end */';
}
// Wrap CSS declarations for CleanCSS > 3.x
// See https://github.com/jakubpawlowicz/clean-css/issues/418
function wrapCSS(text, type) {
switch (type) {
case 'inline':
return '*{' + text + '}';
case 'media':
return '@media ' + text + '{a{top:0}}';
default:
return text;
}
}
function unwrapCSS(text, type) {
let matches;
switch (type) {
case 'inline':
matches = text.match(/^\*\{([\s\S]*)\}$/);
break;
case 'media':
matches = text.match(/^@media ([\s\S]*?)\s*{[\s\S]*}$/);
break;
}
return matches ? matches[1] : text;
}
async function cleanConditionalComment(comment, options) {
return options.processConditionalComments
? await replaceAsync(comment, /^(\[if\s[^\]]+]>)([\s\S]*?)(<!\[endif])$/, async function (match, prefix, text, suffix) {
return prefix + await minifyHTML(text, options, true) + suffix;
})
: comment;
}
async function processScript(text, options, currentAttrs) {
for (let i = 0, len = currentAttrs.length; i < len; i++) {
if (currentAttrs[i].name.toLowerCase() === 'type' &&
options.processScripts.indexOf(currentAttrs[i].value) > -1) {
return await minifyHTML(text, options);
}
}
return text;
}
// Tag omission rules from https://html.spec.whatwg.org/multipage/syntax.html#optional-tags
// with the following deviations:
// - retain <body> if followed by <noscript>
// - </rb>, </rt>, </rtc>, </rp> & </tfoot> follow https://www.w3.org/TR/html5/syntax.html#optional-tags
// - retain all tags which are adjacent to non-standard HTML tags
const optionalStartTags = new Set(['html', 'head', 'body', 'colgroup', 'tbody']);
const optionalEndTags = new Set(['html', 'head', 'body', 'li', 'dt', 'dd', 'p', 'rb', 'rt', 'rtc', 'rp', 'optgroup', 'option', 'colgroup', 'caption', 'thead', 'tbody', 'tfoot', 'tr', 'td', 'th']);
const headerTags = new Set(['meta', 'link', 'script', 'style', 'template', 'noscript']);
const descriptionTags = new Set(['dt', 'dd']);
const pBlockTags = new Set(['address', 'article', 'aside', 'blockquote', 'details', 'div', 'dl', 'fieldset', 'figcaption', 'figure', 'footer', 'form', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'header', 'hgroup', 'hr', 'main', 'menu', 'nav', 'ol', 'p', 'pre', 'section', 'table', 'ul']);
const pInlineTags = new Set(['a', 'audio', 'del', 'ins', 'map', 'noscript', 'video']);
const rubyTags = new Set(['rb', 'rt', 'rtc', 'rp']);
const rtcTag = new Set(['rb', 'rtc', 'rp']);
const optionTag = new Set(['option', 'optgroup']);
const tableContentTags = new Set(['tbody', 'tfoot']);
const tableSectionTags = new Set(['thead', 'tbody', 'tfoot']);
const cellTags = new Set(['td', 'th']);
const topLevelTags = new Set(['html', 'head', 'body']);
const compactTags = new Set(['html', 'body']);
const looseTags = new Set(['head', 'colgroup', 'caption']);
const trailingTags = new Set(['dt', 'thead']);
const htmlTags = new Set(['a', 'abbr', 'acronym', 'address', 'applet', 'area', 'article', 'aside', 'audio', 'b', 'base', 'basefont', 'bdi', 'bdo', 'bgsound', 'big', 'blink', 'blockquote', 'body', 'br', 'button', 'canvas', 'caption', 'center', 'cite', 'code', 'col', 'colgroup', 'command', 'content', 'data', 'datalist', 'dd', 'del', 'details', 'dfn', 'dialog', 'dir', 'div', 'dl', 'dt', 'element', 'em', 'embed', 'fieldset', 'figcaption', 'figure', 'font', 'footer', 'form', 'frame', 'frameset', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'head', 'header', 'hgroup', 'hr', 'html', 'i', 'iframe', 'image', 'img', 'input', 'ins', 'isindex', 'kbd', 'keygen', 'label', 'legend', 'li', 'link', 'listing', 'main', 'map', 'mark', 'marquee', 'menu', 'menuitem', 'meta', 'meter', 'multicol', 'nav', 'nobr', 'noembed', 'noframes', 'noscript', 'object', 'ol', 'optgroup', 'option', 'output', 'p', 'param', 'picture', 'plaintext', 'pre', 'progress', 'q', 'rb', 'rp', 'rt', 'rtc', 'ruby', 's', 'samp', 'script', 'section', 'select', 'shadow', 'small', 'source', 'spacer', 'span', 'strike', 'strong', 'style', 'sub', 'summary', 'sup', 'table', 'tbody', 'td', 'template', 'textarea', 'tfoot', 'th', 'thead', 'time', 'title', 'tr', 'track', 'tt', 'u', 'ul', 'var', 'video', 'wbr', 'xmp']);
function canRemoveParentTag(optionalStartTag, tag) {
switch (optionalStartTag) {
case 'html':
case 'head':
return true;
case 'body':
return !headerTags.has(tag);
case 'colgroup':
return tag === 'col';
case 'tbody':
return tag === 'tr';
}
return false;
}
function isStartTagMandatory(optionalEndTag, tag) {
switch (tag) {
case 'colgroup':
return optionalEndTag === 'colgroup';
case 'tbody':
return tableSectionTags.has(optionalEndTag);
}
return false;
}
function canRemovePrecedingTag(optionalEndTag, tag) {
switch (optionalEndTag) {
case 'html':
case 'head':
case 'body':
case 'colgroup':
case 'caption':
return true;
case 'li':
case 'optgroup':
case 'tr':
return tag === optionalEndTag;
case 'dt':
case 'dd':
return descriptionTags.has(tag);
case 'p':
return pBlockTags.has(tag);
case 'rb':
case 'rt':
case 'rp':
return rubyTags.has(tag);
case 'rtc':
return rtcTag.has(tag);
case 'option':
return optionTag.has(tag);
case 'thead':
case 'tbody':
return tableContentTags.has(tag);
case 'tfoot':
return tag === 'tbody';
case 'td':
case 'th':
return cellTags.has(tag);
}
return false;
}
const reEmptyAttribute = new RegExp(
'^(?:class|id|style|title|lang|dir|on(?:focus|blur|change|click|dblclick|mouse(' +
'?:down|up|over|move|out)|key(?:press|down|up)))$');
function canDeleteEmptyAttribute(tag, attrName, attrValue, options) {
const isValueEmpty = !attrValue || /^\s*$/.test(attrValue);
if (!isValueEmpty) {
return false;
}
if (typeof options.removeEmptyAttributes === 'function') {
return options.removeEmptyAttributes(attrName, tag);
}
return (tag === 'input' && attrName === 'value') || reEmptyAttribute.test(attrName);
}
function hasAttrName(name, attrs) {
for (let i = attrs.length - 1; i >= 0; i--) {
if (attrs[i].name === name) {
return true;
}
}
return false;
}
function canRemoveElement(tag, attrs) {
switch (tag) {
case 'textarea':
return false;
case 'audio':
case 'script':
case 'video':
if (hasAttrName('src', attrs)) {
return false;
}
break;
case 'iframe':
if (hasAttrName('src', attrs) || hasAttrName('srcdoc', attrs)) {
return false;
}
break;
case 'object':
if (hasAttrName('data', attrs)) {
return false;
}
break;
case 'applet':
if (hasAttrName('code', attrs)) {
return false;
}
break;
}
return true;
}
function canCollapseWhitespace(tag) {
return !/^(?:script|style|pre|textarea)$/.test(tag);
}
function canTrimWhitespace(tag) {
return !/^(?:pre|textarea)$/.test(tag);
}
async function normalizeAttr(attr, attrs, tag, options) {
const attrName = options.name(attr.name);
let attrValue = attr.value;
if (options.decodeEntities && attrValue) {
attrValue = decodeHTMLStrict(attrValue);
}
if ((options.removeRedundantAttributes &&
isAttributeRedundant(tag, attrName, attrValue, attrs)) ||
(options.removeScriptTypeAttributes && tag === 'script' &&
attrName === 'type' && isScriptTypeAttribute(attrValue) && !keepScriptTypeAttribute(attrValue)) ||
(options.removeStyleLinkTypeAttributes && (tag === 'style' || tag === 'link') &&
attrName === 'type' && isStyleLinkTypeAttribute(attrValue))) {
return;
}
if (attrValue) {
attrValue = await cleanAttributeValue(tag, attrName, attrValue, options, attrs);
}
if (options.removeEmptyAttributes &&
canDeleteEmptyAttribute(tag, attrName, attrValue, options)) {
return;
}
if (options.decodeEntities && attrValue) {
attrValue = attrValue.replace(/&(#?[0-9a-zA-Z]+;)/g, '&$1');
}
return {
attr,
name: attrName,
value: attrValue
};
}
function buildAttr(normalized, hasUnarySlash, options, isLast, uidAttr) {
const attrName = normalized.name;
let attrValue = normalized.value;
const attr = normalized.attr;
let attrQuote = attr.quote;
let attrFragment;
let emittedAttrValue;
if (typeof attrValue !== 'undefined' && (!options.removeAttributeQuotes ||
~attrValue.indexOf(uidAttr) || !canRemoveAttributeQuotes(attrValue))) {
if (!options.preventAttributesEscaping) {
if (typeof options.quoteCharacter === 'undefined') {
const apos = (attrValue.match(/'/g) || []).length;
const quot = (attrValue.match(/"/g) || []).length;
attrQuote = apos < quot ? '\'' : '"';
} else {
attrQuote = options.quoteCharacter === '\'' ? '\'' : '"';
}
if (attrQuote === '"') {
attrValue = attrValue.replace(/"/g, '"');
} else {
attrValue = attrValue.replace(/'/g, ''');
}
}
emittedAttrValue = attrQuote + attrValue + attrQuote;
if (!isLast && !options.removeTagWhitespace) {
emittedAttrValue += ' ';
}
} else if (isLast && !hasUnarySlash && !/\/$/.test(attrValue)) {
// make sure trailing slash is not interpreted as HTML self-closing tag
emittedAttrValue = attrValue;
} else {
emittedAttrValue = attrValue + ' ';
}
if (typeof attrValue === 'undefined' || (options.collapseBooleanAttributes &&
isBooleanAttribute(attrName.toLowerCase(), attrValue.toLowerCase()))) {
attrFragment = attrName;
if (!isLast) {
attrFragment += ' ';
}
} else {
attrFragment = attrName + attr.customAssign + emittedAttrValue;
}
return attr.customOpen + attrFragment + attr.customClose;
}
function identity(value) {
return value;
}
function identityAsync(value) {
return Promise.resolve(value);
}
const processOptions = (inputOptions) => {
const options = {
name: function (name) {
return name.toLowerCase();
},
canCollapseWhitespace,
canTrimWhitespace,
html5: true,
ignoreCustomComments: [
/^!/,
/^\s*#/
],
ignoreCustomFragments: [
/<%[\s\S]*?%>/,
/<\?[\s\S]*?\?>/
],
includeAutoGeneratedTags: true,
log: identity,
minifyCSS: identityAsync,
minifyJS: identity,
minifyURLs: identity
};
Object.keys(inputOptions).forEach(function (key) {
const option = inputOptions[key];
if (key === 'caseSensitive') {
if (option) {
options.name = identity;
}
} else if (key === 'log') {
if (typeof option === 'function') {
options.log = option;
}
} else if (key === 'minifyCSS' && typeof option !== 'function') {
if (!option) {
return;
}
const cleanCssOptions = typeof option === 'object' ? option : {};
options.minifyCSS = async function (text, type) {
text = text.replace(/(url\s*\(\s*)("|'|)(.*?)\2(\s*\))/ig, function (match, prefix, quote, url, suffix) {
return prefix + quote + options.minifyURLs(url) + quote + suffix;
});
const inputCSS = wrapCSS(text, type);
return new Promise((resolve) => {
new CleanCSS(cleanCssOptions).minify(inputCSS, (_err, output) => {
if (output.errors.length > 0) {
output.errors.forEach(options.log);
resolve(text);
}
const outputCSS = unwrapCSS(output.styles, type);
resolve(outputCSS);
});
});
};
} else if (key === 'minifyJS' && typeof option !== 'function') {
if (!option) {
return;
}
const terserOptions = typeof option === 'object' ? option : {};
terserOptions.parse = {
...terserOptions.parse,
bare_returns: false
};
options.minifyJS = async function (text, inline) {
const start = text.match(/^\s*<!--.*/);
const code = start ? text.slice(start[0].length).replace(/\n\s*-->\s*$/, '') : text;
terserOptions.parse.bare_returns = inline;
try {
const result = await terser(code, terserOptions);
return result.code.replace(/;$/, '');
} catch (error) {
options.log(error);
return text;
}
};
} else if (key === 'minifyURLs' && typeof option !== 'function') {
if (!option) {
return;
}
let relateUrlOptions = option;
if (typeof option === 'string') {
relateUrlOptions = { site: option };
} else if (typeof option !== 'object') {
relateUrlOptions = {};
}
options.minifyURLs = function (text) {
try {
return RelateURL.relate(text, relateUrlOptions);
} catch (err) {
options.log(err);
return text;
}
};
} else {
options[key] = option;
}
});
return options;
};
function uniqueId(value) {
let id;
do {
id = Math.random().toString(36).replace(/^0\.[0-9]*/, '');
} while (~value.indexOf(id));
return id;
}
const specialContentTags = new Set(['script', 'style']);
async function createSortFns(value, options, uidIgnore, uidAttr) {
const attrChains = options.sortAttributes && Object.create(null);
const classChain = options.sortClassName && new TokenChain();
function attrNames(attrs) {
return attrs.map(function (attr) {
return options.name(attr.name);
});
}
function shouldSkipUID(token, uid) {
return !uid || token.indexOf(uid) === -1;
}
function shouldSkipUIDs(token) {
return shouldSkipUID(token, uidIgnore) && shouldSkipUID(token, uidAttr);
}
async function scan(input) {
let currentTag, currentType;
const parser = new HTMLParser(input, {
start: function (tag, attrs) {
if (attrChains) {
if (!attrChains[tag]) {
attrChains[tag] = new TokenChain();
}
attrChains[tag].add(attrNames(attrs).filter(shouldSkipUIDs));
}
for (let i = 0, len = attrs.length; i < len; i++) {
const attr = attrs[i];
if (classChain && attr.value && options.name(attr.name) === 'class') {
classChain.add(trimWhitespace(attr.value).split(/[ \t\n\f\r]+/).filter(shouldSkipUIDs));
} else if (options.processScripts && attr.name.toLowerCase() === 'type') {
currentTag = tag;
currentType = attr.value;
}
}
},
end: function () {
currentTag = '';
},
chars: async function (text) {
if (options.processScripts && specialContentTags.has(currentTag) &&
options.processScripts.indexOf(currentType) > -1) {
await scan(text);
}
}
});
await parser.parse();
}
const log = options.log;
options.log = identity;
options.sortAttributes = false;
options.sortClassName = false;
await scan(await minifyHTML(value, options));
options.log = log;
if (attrChains) {
const attrSorters = Object.create(null);
for (const tag in attrChains) {
attrSorters[tag] = attrChains[tag].createSorter();
}
options.sortAttributes = function (tag, attrs) {
const sorter = attrSorters[tag];
if (sorter) {
const attrMap = Object.create(null);
const names = attrNames(attrs);
names.forEach(function (name, index) {
(attrMap[name] || (attrMap[name] = [])).push(attrs[index]);
});
sorter.sort(names).forEach(function (name, index) {
attrs[index] = attrMap[name].shift();
});
}
};
}
if (classChain) {
const sorter = classChain.createSorter();
options.sortClassName = function (value) {
return sorter.sort(value.split(/[ \n\f\r]+/)).join(' ');
};
}
}
async function minifyHTML(value, options, partialMarkup) {
if (options.collapseWhitespace) {
value = collapseWhitespace(value, options, true, true);
}
const buffer = [];
let charsPrevTag;
let currentChars = '';
let hasChars;
let currentTag = '';
let currentAttrs = [];
const stackNoTrimWhitespace = [];
const stackNoCollapseWhitespace = [];
let optionalStartTag = '';
let optionalEndTag = '';
const ignoredMarkupChunks = [];
const ignoredCustomMarkupChunks = [];
let uidIgnore;
let uidAttr;
let uidPattern;
// temporarily replace ignored chunks with comments,
// so that we don't have to worry what's there.
// for all we care there might be
// completely-horribly-broken-alien-non-html-emoj-cthulhu-filled content
value = value.replace(/<!-- htmlmin:ignore -->([\s\S]*?)<!-- htmlmin:ignore -->/g, function (match, group1) {
if (!uidIgnore) {
uidIgnore = uniqueId(value);
const pattern = new RegExp('^' + uidIgnore + '([0-9]+)$');
if (options.ignoreCustomComments) {
options.ignoreCustomComments = options.ignoreCustomComments.slice();
} else {
options.ignoreCustomComments = [];
}
options.ignoreCustomComments.push(pattern);
}
const token = '<!--' + uidIgnore + ignoredMarkupChunks.length + '-->';
ignoredMarkupChunks.push(group1);
return token;
});
const customFragments = options.ignoreCustomFragments.map(function (re) {
return re.source;
});
if (customFragments.length) {
const reCustomIgnore = new RegExp('\\s*(?:' + customFragments.join('|') + ')+\\s*', 'g');
// temporarily replace custom ignored fragments with unique attributes
value = value.replace(reCustomIgnore, function (match) {
if (!uidAttr) {
uidAttr = uniqueId(value);
uidPattern = new RegExp('(\\s*)' + uidAttr + '([0-9]+)' + uidAttr + '(\\s*)', 'g');
if (options.minifyCSS) {
options.minifyCSS = (function (fn) {
return function (text, type) {
text = text.replace(uidPattern, function (match, prefix, index) {
const chunks = ignoredCustomMarkupChunks[+index];
return chunks[1] + uidAttr + index + uidAttr + chunks[2];
});
const ids = [];
new CleanCSS().minify(wrapCSS(text, type)).warnings.forEach(function (warning) {
const match = uidPattern.exec(warning);
if (match) {
const id = uidAttr + match[2] + uidAttr;
text = text.replace(id, ignoreCSS(id));
ids.push(id);
}
});
return fn(text, type).then(chunk => {
ids.forEach(function (id) {
chunk = chunk.replace(ignoreCSS(id), id);
});
return chunk;
});
};
})(options.minifyCSS);
}
if (options.minifyJS) {
options.minifyJS = (function (fn) {
return function (text, type) {
return fn(text.replace(uidPattern, function (match, prefix, index) {
const chunks = ignoredCustomMarkupChunks[+index];
return chunks[1] + uidAttr + index + uidAttr + chunks[2];
}), type);
};
})(options.minifyJS);
}
}
const token = uidAttr + ignoredCustomMarkupChunks.length + uidAttr;
ignoredCustomMarkupChunks.push(/^(\s*)[\s\S]*?(\s*)$/.exec(match));
return '\t' + token + '\t';
});
}
if ((options.sortAttributes && typeof options.sortAttributes !== 'function') ||
(options.sortClassName && typeof options.sortClassName !== 'function')) {
await createSortFns(value, options, uidIgnore, uidAttr);
}
function _canCollapseWhitespace(tag, attrs) {
return options.canCollapseWhitespace(tag, attrs, canCollapseWhitespace);
}
function _canTrimWhitespace(tag, attrs) {
return options.canTrimWhitespace(tag, attrs, canTrimWhitespace);
}
function removeStartTag() {
let index = buffer.length - 1;
while (index > 0 && !/^<[^/!]/.test(buffer[index])) {
index--;
}
buffer.length = Math.max(0, index);
}
function removeEndTag() {
let index = buffer.length - 1;
while (index > 0 && !/^<\//.test(buffer[index])) {
index--;
}
buffer.length = Math.max(0, index);
}
// look for trailing whitespaces, bypass any inline tags
function trimTrailingWhitespace(index, nextTag) {
for (let endTag = null; index >= 0 && _canTrimWhitespace(endTag); index--) {
const str = buffer[index];
const match = str.match(/^<\/([\w:-]+)>$/);
if (match) {
endTag = match[1];
} else if (/>$/.test(str) || (buffer[index] = collapseWhitespaceSmart(str, null, nextTag, options))) {
break;
}
}
}
// look for trailing whitespaces from previously processed text
// which may not be trimmed due to a following comment or an empty
// element which has now been removed
function squashTrailingWhitespace(nextTag) {
let charsIndex = buffer.length - 1;
if (buffer.length > 1) {
const item = buffer[buffer.length - 1];
if (/^(?:<!|$)/.test(item) && item.indexOf(uidIgnore) === -1) {
charsIndex--;
}
}
trimTrailingWhitespace(charsIndex, nextTag);
}