'use strict';
var CleanCSS = require('clean-css');
var decode = require('he').decode;
var HTMLParser = require('./htmlparser').HTMLParser;
var RelateUrl = require('relateurl');
var TokenChain = require('./tokenchain');
var Terser = require('terser');
var utils = require('./utils');
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, '$1 ');
});
}
function collapseWhitespace(str, options, trimLeft, trimRight, collapseAll) {
var lineBreakBefore = '', lineBreakAfter = '';
if (options.preserveLineBreaks) {
str = str.replace(/^[ \n\r\t\f]*?[\n\r][ \n\r\t\f]*/, function() {
lineBreakBefore = '\n';
return '';
}).replace(/[ \n\r\t\f]*?[\n\r][ \n\r\t\f]*$/, 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) {
var 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) {
var 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;
}
var createMapFromString = utils.createMapFromString;
// non-empty tags that will maintain whitespace around them
var inlineTags = createMapFromString('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
var inlineTextTags = createMapFromString('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
var selfClosingInlineTags = createMapFromString('comment,img,input,wbr');
function collapseWhitespaceSmart(str, prevTag, nextTag, options) {
var trimLeft = prevTag && !selfClosingInlineTags(prevTag);
if (trimLeft && !options.collapseInlineTagWhitespace) {
trimLeft = prevTag.charAt(0) === '/' ? !inlineTags(prevTag.slice(1)) : !inlineTextTags(prevTag);
}
var trimRight = nextTag && !selfClosingInlineTags(nextTag);
if (trimRight && !options.collapseInlineTagWhitespace) {
trimRight = nextTag.charAt(0) === '/' ? !inlineTextTags(nextTag.slice(1)) : !inlineTags(nextTag);
}
return collapseWhitespace(str, options, trimLeft, trimRight, prevTag && nextTag);
}
function isConditionalComment(text) {
return /^\[if\s[^\]]+]|\[endif]$/.test(text);
}
function isIgnoredComment(text, options) {
for (var i = 0, len = options.ignoreCustomComments.length; i < len; i++) {
if (options.ignoreCustomComments[i].test(text)) {
return true;
}
}
return false;
}
function isEventAttribute(attrName, options) {
var patterns = options.customEventAttributes;
if (patterns) {
for (var i = patterns.length; i--;) {
if (patterns[i].test(attrName)) {
return true;
}
}
return false;
}
return /^on[a-z]{3,}$/.test(attrName);
}
function canRemoveAttributeQuotes(value) {
// https://mathiasbynens.be/notes/unquoted-attribute-values
return /^[^ \t\n\f\r"'`=<>]+$/.test(value);
}
function attributesInclude(attributes, attribute) {
for (var 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
var executableScriptsMimetypes = utils.createMap([
'text/javascript',
'text/ecmascript',
'text/jscript',
'application/javascript',
'application/x-javascript',
'application/ecmascript',
'module'
]);
var keepScriptsMimetypes = utils.createMap([
'module'
]);
function isScriptTypeAttribute(attrValue) {
attrValue = trimWhitespace(attrValue.split(/;/, 2)[0]).toLowerCase();
return attrValue === '' || executableScriptsMimetypes(attrValue);
}
function keepScriptTypeAttribute(attrValue) {
attrValue = trimWhitespace(attrValue.split(/;/, 2)[0]).toLowerCase();
return keepScriptsMimetypes(attrValue);
}
function isExecutableScript(tag, attrs) {
if (tag !== 'script') {
return false;
}
for (var i = 0, len = attrs.length; i < len; i++) {
var 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 (var i = 0, len = attrs.length; i < len; i++) {
var attrName = attrs[i].name.toLowerCase();
if (attrName === 'type') {
return isStyleLinkTypeAttribute(attrs[i].value);
}
}
return true;
}
var isSimpleBoolean = createMapFromString('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');
var isBooleanValue = createMapFromString('true,false');
function isBooleanAttribute(attrName, attrValue) {
return isSimpleBoolean(attrName) || attrName === 'draggable' && !isBooleanValue(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 (var 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));
}
var srcsetTags = createMapFromString('img,source');
function isSrcset(attrName, tag) {
return attrName === 'srcset' && srcsetTags(tag);
}
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*;$/, ';');
}
attrValue = options.minifyCSS(attrValue, 'inline');
}
return attrValue;
}
else if (isSrcset(attrName, tag)) {
// https://html.spec.whatwg.org/multipage/embedded-content.html#attr-img-srcset
attrValue = trimWhitespace(attrValue).split(/\s+,\s*|\s*,\s+/).map(function(candidate) {
var url = candidate;
var descriptor = '';
var match = candidate.match(/\s+([1-9][0-9]*w|[0-9]+(?:\.[0-9]+)?x)$/);
if (match) {
url = url.slice(0, -match[0].length);
var num = +match[1].slice(0, -1);
var 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 = attrValue.replace(/\n+|\r+|\s{2,}/g, '');
}
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 (var 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 (var 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) {
var 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;
}
function cleanConditionalComment(comment, options) {
return options.processConditionalComments ? comment.replace(/^(\[if\s[^\]]+]>)([\s\S]*?)( -1) {
return minify(text, options);
}
}
return text;
}
// Tag omission rules from https://html.spec.whatwg.org/multipage/syntax.html#optional-tags
// with the following deviations:
// - retain
if followed by