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htmlminifier.js
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'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 UglifyJS = require('uglify-js');
var utils = require('./utils');
var trimWhitespace = String.prototype.trim ? function(str) {
if (typeof str !== 'string') {
return str;
}
return str.trim();
} : function(str) {
if (typeof str !== 'string') {
return str;
}
return str.replace(/^\s+/, '').replace(/\s+$/, '');
};
function compressWhitespace(spaces) {
return spaces === '\t' ? spaces : ' ';
}
function collapseWhitespaceAll(str) {
return str ? str.replace(/[\t\n\r ]+/g, compressWhitespace) : str;
}
function collapseWhitespace(str, options, trimLeft, trimRight, collapseAll) {
var lineBreakBefore = '', lineBreakAfter = '';
if (options.preserveLineBreaks) {
str = str.replace(/^[\t ]*[\n\r][\t\n\r ]*/, function() {
lineBreakBefore = '\n';
return '';
}).replace(/[\t ]*[\n\r][\t\n\r ]*$/, function() {
lineBreakAfter = '\n';
return '';
});
}
if (trimLeft) {
str = str.replace(/^\s+/, !lineBreakBefore && options.conservativeCollapse ? compressWhitespace : '');
}
if (trimRight) {
str = str.replace(/\s+$/, !lineBreakAfter && options.conservativeCollapse ? compressWhitespace : '');
}
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,mark,math,nobr,q,rt,rp,s,samp,small,span,strike,strong,sub,sup,svg,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,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) {
// http://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'
]);
function isScriptTypeAttribute(attrValue) {
attrValue = trimWhitespace(attrValue.split(/;/, 2)[0]).toLowerCase();
return attrValue === '' || executableScriptsMimetypes(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 (attrValue && 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*;$/, '');
}
attrValue = unwrapInlineCSS(options.minifyCSS(wrapInlineCSS(attrValue)));
}
return attrValue;
}
else if (isSrcset(attrName, tag)) {
// https://html.spec.whatwg.org/multipage/embedded-content.html#attr-img-srcset
attrValue = trimWhitespace(attrValue).split(/\s+,\s*|\s*,\s+/).map(function(candidate) {
var url = candidate;
var descriptor = '';
var match = candidate.match(/\s+([1-9][0-9]*w|[0-9]+(?:\.[0-9]+)?x)$/);
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 (attrValue && 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 unwrapMediaQuery(options.minifyCSS(wrapMediaQuery(attrValue)));
}
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;
}
}
}
// Wrap CSS declarations for CleanCSS > 3.x
// See https://github.com/jakubpawlowicz/clean-css/issues/418
function wrapInlineCSS(text) {
return '*{' + text + '}';
}
function unwrapInlineCSS(text) {
var matches = text.match(/^\*\{([\s\S]*)\}$/);
return matches ? matches[1] : text;
}
function wrapMediaQuery(text) {
return '@media ' + text + '{a{top:0}}';
}
function unwrapMediaQuery(text) {
var matches = text.match(/^@media ([\s\S]*?)\s*{[\s\S]*}$/);
return matches ? matches[1] : text;
}
function cleanConditionalComment(comment, options) {
return options.processConditionalComments ? comment.replace(/^(\[if\s[^\]]+\]>)([\s\S]*?)(<!\[endif\])$/, function(match, prefix, text, suffix) {
return prefix + minify(text, options, true) + suffix;
}) : comment;
}
function processScript(text, options, currentAttrs) {
for (var i = 0, len = currentAttrs.length; i < len; i++) {
if (currentAttrs[i].name.toLowerCase() === 'type' &&
options.processScripts.indexOf(currentAttrs[i].value) > -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 <body> if followed by <noscript>
// - </rb>, </rt>, </rtc>, </rp> & </tfoot> follow http://www.w3.org/TR/html5/syntax.html#optional-tags
// - retain all tags which are adjacent to non-standard HTML tags
var optionalStartTags = createMapFromString('html,head,body,colgroup,tbody');
var optionalEndTags = createMapFromString('html,head,body,li,dt,dd,p,rb,rt,rtc,rp,optgroup,option,colgroup,caption,thead,tbody,tfoot,tr,td,th');
var headerTags = createMapFromString('meta,link,script,style,template,noscript');
var descriptionTags = createMapFromString('dt,dd');
var pBlockTags = createMapFromString('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');
var pInlineTags = createMapFromString('a,audio,del,ins,map,noscript,video');
var rubyTags = createMapFromString('rb,rt,rtc,rp');
var rtcTag = createMapFromString('rb,rtc,rp');
var optionTag = createMapFromString('option,optgroup');
var tableContentTags = createMapFromString('tbody,tfoot');
var tableSectionTags = createMapFromString('thead,tbody,tfoot');
var cellTags = createMapFromString('td,th');
var topLevelTags = createMapFromString('html,head,body');
var compactTags = createMapFromString('html,body');
var looseTags = createMapFromString('head,colgroup,caption');
var trailingTags = createMapFromString('dt,thead');
var htmlTags = createMapFromString('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,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(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(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(tag);
case 'p':
return pBlockTags(tag);
case 'rb':
case 'rt':
case 'rp':
return rubyTags(tag);
case 'rtc':
return rtcTag(tag);
case 'option':
return optionTag(tag);
case 'thead':
case 'tbody':
return tableContentTags(tag);
case 'tfoot':
return tag === 'tbody';
case 'td':
case 'th':
return cellTags(tag);
}
return false;
}
var 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) {
var isValueEmpty = !attrValue || /^\s*$/.test(attrValue);
if (isValueEmpty) {
return tag === 'input' && attrName === 'value' || reEmptyAttribute.test(attrName);
}
return false;
}
function hasAttrName(name, attrs) {
for (var i = attrs.length - 1; i >= 0; i--) {
if (attrs[i].name === name) {
return true;
}
}
return false;
}
function canRemoveElement(tag, attrs) {
switch (tag) {
case 'textarea':
return false;
case 'audio':
case 'script':
case 'video':
if (hasAttrName('src', attrs)) {
return false;
}
break;
case 'iframe':
if (hasAttrName('src', attrs) || hasAttrName('srcdoc', attrs)) {
return false;
}
break;
case 'object':
if (hasAttrName('data', attrs)) {
return false;
}
break;
case 'applet':
if (hasAttrName('code', attrs)) {
return false;
}
break;
}
return true;
}
function canCollapseWhitespace(tag) {
return !/^(?:script|style|pre|textarea)$/.test(tag);
}
function canTrimWhitespace(tag) {
return !/^(?:pre|textarea)$/.test(tag);
}
function normalizeAttr(attr, attrs, tag, options) {
var attrName = options.caseSensitive ? attr.name : attr.name.toLowerCase(),
attrValue = attr.value;
if (options.decodeEntities && attrValue) {
attrValue = decode(attrValue, { isAttributeValue: true });
}
if (options.removeRedundantAttributes &&
isAttributeRedundant(tag, attrName, attrValue, attrs) ||
options.removeScriptTypeAttributes && tag === 'script' &&
attrName === 'type' && isScriptTypeAttribute(attrValue) ||
options.removeStyleLinkTypeAttributes && (tag === 'style' || tag === 'link') &&
attrName === 'type' && isStyleLinkTypeAttribute(attrValue)) {
return;
}
attrValue = cleanAttributeValue(tag, attrName, attrValue, options, attrs);
if (options.removeEmptyAttributes &&
canDeleteEmptyAttribute(tag, attrName, attrValue)) {
return;
}
if (options.decodeEntities && attrValue) {
attrValue = attrValue.replace(/&(#?[0-9a-zA-Z]+;)/g, '&$1');
}
return {
attr: attr,
name: attrName,
value: attrValue
};
}
function buildAttr(normalized, hasUnarySlash, options, isLast) {
var attrName = normalized.name,
attrValue = normalized.value,
attr = normalized.attr,
attrQuote = attr.quote,
attrFragment,
emittedAttrValue;
if (typeof attrValue !== 'undefined' && !options.removeAttributeQuotes ||
!canRemoveAttributeQuotes(attrValue)) {
if (!options.preventAttributesEscaping) {
if (typeof options.quoteCharacter === 'undefined') {
var apos = (attrValue.match(/'/g) || []).length;
var quot = (attrValue.match(/"/g) || []).length;
attrQuote = apos < quot ? '\'' : '"';
}
else {
attrQuote = options.quoteCharacter === '\'' ? '\'' : '"';
}
if (attrQuote === '"') {
attrValue = attrValue.replace(/"/g, '"');
}
else {
attrValue = attrValue.replace(/'/g, ''');
}
}
emittedAttrValue = attrQuote + attrValue + attrQuote;
if (!isLast && !options.removeTagWhitespace) {
emittedAttrValue += ' ';
}
}
// make sure trailing slash is not interpreted as HTML self-closing tag
else if (isLast && !hasUnarySlash && !/\/$/.test(attrValue)) {
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;
}
var fnPrefix = '!function(){';
var fnSuffix = '}();';
function processOptions(options) {
['html5', 'includeAutoGeneratedTags'].forEach(function(key) {
if (!(key in options)) {
options[key] = true;
}
});
if (typeof options.log !== 'function') {
options.log = identity;
}
var defaultTesters = ['canCollapseWhitespace', 'canTrimWhitespace'];
for (var i = 0, len = defaultTesters.length; i < len; i++) {
if (!options[defaultTesters[i]]) {
options[defaultTesters[i]] = function() {
return false;
};
}
}
if (!('ignoreCustomComments' in options)) {
options.ignoreCustomComments = [/^!/];
}
if (!('ignoreCustomFragments' in options)) {
options.ignoreCustomFragments = [
/<%[\s\S]*?%>/,
/<\?[\s\S]*?\?>/
];
}
if (!options.minifyURLs) {
options.minifyURLs = identity;
}
if (typeof options.minifyURLs !== 'function') {
var minifyURLs = options.minifyURLs;
if (typeof minifyURLs === 'string') {
minifyURLs = { site: minifyURLs };
}
else if (typeof minifyURLs !== 'object') {
minifyURLs = {};
}
options.minifyURLs = function(text) {
try {
return RelateUrl.relate(text, minifyURLs);
}
catch (err) {
options.log(err);
return text;
}
};
}
if (!options.minifyJS) {
options.minifyJS = identity;
}
if (typeof options.minifyJS !== 'function') {
var minifyJS = options.minifyJS;
if (typeof minifyJS !== 'object') {
minifyJS = {};
}
minifyJS.fromString = true;
(minifyJS.output || (minifyJS.output = {})).inline_script = true;
options.minifyJS = function(text, inline) {
var start = text.match(/^\s*<!--.*/);
var code = start ? text.slice(start[0].length).replace(/\n\s*-->\s*$/, '') : text;
try {
if (inline) {
code = fnPrefix + code + fnSuffix;
}
code = UglifyJS.minify(code, minifyJS).code;
if (inline) {
code = code.slice(fnPrefix.length, -fnSuffix.length);
}
if (/;$/.test(code)) {
code = code.slice(0, -1);
}
return code;
}
catch (err) {
options.log(err);
return text;
}
};
}
if (!options.minifyCSS) {
options.minifyCSS = identity;
}
if (typeof options.minifyCSS !== 'function') {
var minifyCSS = options.minifyCSS;
if (typeof minifyCSS !== 'object') {
minifyCSS = {};
}
if (typeof minifyCSS.advanced === 'undefined') {
minifyCSS.advanced = false;
}
options.minifyCSS = function(text) {
text = text.replace(/(url\s*\(\s*)("|'|)(.*?)\2(\s*\))/ig, function(match, prefix, quote, url, suffix) {
return prefix + quote + options.minifyURLs(url) + quote + suffix;
});
var start = text.match(/^\s*<!--/);
var style = start ? text.slice(start[0].length).replace(/-->\s*$/, '') : text;
try {
return new CleanCSS(minifyCSS).minify(style).styles;
}
catch (err) {
options.log(err);
return text;
}
};
}
}
function uniqueId(value) {
var id;
do {
id = Math.random().toString(36).replace(/^0\.[0-9]*/, '');
} while (~value.indexOf(id));
return id;
}
var specialContentTags = createMapFromString('script,style');
function createSortFns(value, options, uidIgnore, uidAttr) {
var attrChains = options.sortAttributes && Object.create(null);
var classChain = options.sortClassName && new TokenChain();
function attrNames(attrs) {
return attrs.map(function(attr) {
return options.caseSensitive ? attr.name : attr.name.toLowerCase();
});
}
function shouldSkipUID(token, uid) {
return !uid || token.indexOf(uid) === -1;
}
function shouldSkipUIDs(token) {
return shouldSkipUID(token, uidIgnore) && shouldSkipUID(token, uidAttr);
}
function scan(input) {
var currentTag, currentType;
new HTMLParser(input, {
start: function(tag, attrs) {
if (attrChains) {
if (!attrChains[tag]) {
attrChains[tag] = new TokenChain();
}
attrChains[tag].add(attrNames(attrs).filter(shouldSkipUIDs));
}
for (var i = 0, len = attrs.length; i < len; i++) {
var attr = attrs[i];
if (classChain && (options.caseSensitive ? attr.name : attr.name.toLowerCase()) === 'class') {
classChain.add(trimWhitespace(attr.value).split(/\s+/).filter(shouldSkipUIDs));
}
else if (options.processScripts && attr.name.toLowerCase() === 'type') {
currentTag = tag;
currentType = attr.value;
}
}
},
end: function() {
currentTag = '';
},
chars: function(text) {
if (options.processScripts && specialContentTags(currentTag) &&
options.processScripts.indexOf(currentType) > -1) {
scan(text);
}
}
});
}
var log = options.log;
options.log = null;
options.sortAttributes = false;
options.sortClassName = false;
scan(minify(value, options));
options.log = log;
if (attrChains) {
var attrSorters = Object.create(null);
for (var tag in attrChains) {
attrSorters[tag] = attrChains[tag].createSorter();
}
options.sortAttributes = function(tag, attrs) {
var sorter = attrSorters[tag];
if (sorter) {
var attrMap = Object.create(null);
var 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) {
var sorter = classChain.createSorter();
options.sortClassName = function(value) {
return sorter.sort(value.split(/\s+/)).join(' ');
};
}
}
function minify(value, options, partialMarkup) {
options = options || {};
var optionsStack = [];
processOptions(options);
if (options.collapseWhitespace) {
value = collapseWhitespace(value, options, true, true);
}
var buffer = [],
charsPrevTag,
currentChars = '',
hasChars,
currentTag = '',
currentAttrs = [],
stackNoTrimWhitespace = [],
stackNoCollapseWhitespace = [],
optionalStartTag = '',
optionalEndTag = '',
t = Date.now(),
ignoredMarkupChunks = [],
ignoredCustomMarkupChunks = [],
uidIgnore,
uidAttr,
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);
var pattern = new RegExp('^' + uidIgnore + '([0-9]+)$');
if (options.ignoreCustomComments) {
options.ignoreCustomComments.push(pattern);
}
else {
options.ignoreCustomComments = [pattern];
}
}
var token = '<!--' + uidIgnore + ignoredMarkupChunks.length + '-->';
ignoredMarkupChunks.push(group1);
return token;
});
function escapeFragments(text) {
return text.replace(uidPattern, function(match, prefix, index) {
var chunks = ignoredCustomMarkupChunks[+index];
return chunks[1] + uidAttr + index + chunks[2];
});
}
function restoreCustomFragments(text) {
return text.replace(uidPattern, function(match, prefix, index) {
return ignoredCustomMarkupChunks[+index][0];
});
}
var customFragments = options.ignoreCustomFragments.map(function(re) {
return re.source;
});
if (customFragments.length) {
var reCustomIgnore = new RegExp('(\\s*)(?:' + customFragments.join('|') + ')+(\\s*)', 'g');
// temporarily replace custom ignored fragments with unique attributes
value = value.replace(reCustomIgnore, function(match, prefix, suffix) {
if (!uidAttr) {
uidAttr = uniqueId(value);
uidPattern = new RegExp('(\\s*)' + uidAttr + '([0-9]+)(\\s*)', 'g');
var minifyCSS = options.minifyCSS;
if (minifyCSS) {
options.minifyCSS = function(text) {
if (options.preserveCustomFragmentsInStyle) {
text = restoreCustomFragments(text);
}
return minifyCSS(escapeFragments(text));
};
}
var minifyJS = options.minifyJS;
if (minifyJS) {
options.minifyJS = function(text, inline) {
if (options.preserveCustomFragmentsInScripts) {
text = restoreCustomFragments(text);
}
return minifyJS(escapeFragments(text), inline);
};
}
}
var token = uidAttr + ignoredCustomMarkupChunks.length;
ignoredCustomMarkupChunks.push([match, prefix, suffix]);
return '\t' + token + '\t';
});
}
if (options.sortAttributes && typeof options.sortAttributes !== 'function' ||
options.sortClassName && typeof options.sortClassName !== 'function') {
createSortFns(value, options, uidIgnore, uidAttr);
}
function _canCollapseWhitespace(tag, attrs) {
return canCollapseWhitespace(tag) || options.canCollapseWhitespace(tag, attrs);
}
function _canTrimWhitespace(tag, attrs) {
return canTrimWhitespace(tag) || options.canTrimWhitespace(tag, attrs);
}
function removeStartTag() {
var index = buffer.length - 1;
while (index > 0 && !/^<[^/!]/.test(buffer[index])) {
index--;
}
buffer.length = Math.max(0, index);
}
function removeEndTag() {
var 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 (var endTag = null; index >= 0 && _canTrimWhitespace(endTag); index--) {
var str = buffer[index];
var 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) {
var charsIndex = buffer.length - 1;
if (buffer.length > 1) {
var item = buffer[buffer.length - 1];
if (/^(?:<!|$)/.test(item) && item.indexOf(uidIgnore) === -1) {
charsIndex--;
}
}
trimTrailingWhitespace(charsIndex, nextTag);
}
new HTMLParser(value, {
partialMarkup: partialMarkup,
html5: options.html5,
start: function(tag, attrs, unary, unarySlash, autoGenerated) {
var lowerTag = tag.toLowerCase();
if (lowerTag === 'svg') {
optionsStack.push(options);
var nextOptions = {};
for (var key in options) {
nextOptions[key] = options[key];
}
nextOptions.keepClosingSlash = true;
nextOptions.caseSensitive = true;
options = nextOptions;
}
tag = options.caseSensitive ? tag : lowerTag;
currentTag = tag;
charsPrevTag = tag;
if (!inlineTextTags(tag)) {
currentChars = '';
}
hasChars = false;
currentAttrs = attrs;
var optional = options.removeOptionalTags;
if (optional) {
var htmlTag = htmlTags(tag);
// <html> may be omitted if first thing inside is not comment
// <head> may be omitted if first thing inside is an element
// <body> may be omitted if first thing inside is not space, comment, <meta>, <link>, <script>, <style> or <template>
// <colgroup> may be omitted if first thing inside is <col>