util.js

console.log( "=== simpread util load ===" )

/**
 * Verify html from puread/util verifyHtml()
 * 
 * @param  {string} input include html tag, e.g.:
    <div class="article fmt article__content">
 *
 * @return {array} 0: int include ( -1: fail； 0: empty html; 1: success; 2: special tag )
 *                 1: result
 */
function verifyHtml( html ) {
    if ( html == "" ) return [ 0, html ];
    else if ( specTest( html )) return [ 2, html ];
    const item = html.match( /<\S+ (class|id)=("|')?[\w-_=;:' ]+("|')?>?$|<[^/][-_a-zA-Z0-9]+>?$/ig );
    if ( item && item.length > 0 ) {
        return [ 1, item ];
    } else {
        return [ -1, undefined ];
    }
}

/**
 * Verify special action from puread/util specTest()
 * action include:
   - [[{juqery code}]] // new Function, e.g. $("xxx").xxx() return string
   - [['text']]        // remove '<text>'
   - [[/regexp/]]      // regexp e.g. $("sr-rd-content").find( "*[src='http://ifanr-cdn.b0.upaiyun.com/wp-content/uploads/2016/09/AppSo-qrcode-signature.jpg']" )
   - [[[juqery code]]] // new Function, e.g. $("xxx").find() return jquery object

 * 
 * @param  {string} verify content
 * @return {boolen} verify result
 */
function specTest( content ) {
    return /^(\[\[)[\[{'/]{1}[ \S]+[}'/\]]\]\]{1}($)/g.test( content );
}

/**
 * Html convert to enml
 * 
 * @param  {string} convert string
 * @param  {string} url
 * 
 * @return {string} convert string
 */
function html2enml( html, url ) {
    let $target, str;
    const bad  = [ "sup", "hr", "section", "applet", "base", "basefont", "bgsound", "blink", "body", "button", "dir", "embed", "fieldset", "form", "frame", "frameset", "head", "html", "iframe", "ilayer", "input", "isindex", "label", "layer", "legend", "link", "marquee", "menu", "meta", "noframes", "noscript", "object", "optgroup", "option", "param", "plaintext", "script", "select", "style", "textarea", "xml" ],
          good = [ "a", "abbr", "acronym", "address", "area", "b", "bdo", "big", "blockquote", "br", "caption", "center", "cite", "code", "col", "colgroup", "dd", "del", "dfn", "div", "dl", "dt", "em", "font", "h1", "h2", "h3", "h4", "h5", "h6", "hr", "i", "img", "ins", "kbd", "li", "map", "ol", "p", "pre", "q", "s", "samp", "small", "span", "strike", "strong", "sub", "sup", "table", "tbody", "td", "tfoot", "th", "thead", "title", "tr", "tt", "u", "ul", "var", "xmp"];

    $( "html" ).append( `<div id="simpread-en" style="display: none;">${html}</div>` );
    $target = $( "#simpread-en" );
    $target.find( "img" ).map( ( index, item ) => {
        $( '<simpread-img></simpread-img>' ).attr({ src: item.src, style: "max-width:100%;height:auto;" }).replaceAll( $(item) );
    });
    $target.find( bad.join( "," ) ).remove();
    // remove element all atrr
    $target.find( "*" ).map( ( index, item ) => {
        const tag = item.tagName.toLowerCase();
        if ( tag.startsWith( "sr" ) && /sr-\S[^>]+/ig.test( tag )) {
            $(item).remove();
        }
        else if ( item.attributes.length > 0 ) {
            for ( let i = item.attributes.length - 1; i >= 0; i-- ) {
                const name = item.attributes[i].name;
                if ( tag == "a" && name == "href" ) {
                    let value = item.attributes[i].value;
                    value.startsWith( "//" ) && ( item.attributes[i].value += location.protocol );
                    continue;
                } else if ( tag == "simpread-img" ) {
                    continue;
                }
                item.removeAttribute( name )
            }
        }
    });
    str = $target.html();
    $target.remove();

    try {
        str = `<blockquote>本文由 <a href="http://ksria.com/simpread" target="_blank">简悦 SimpRead</a> 转码，原文地址 <a href="${url}" target="_blank">${url}</a></blockquote><hr></hr><br></br>` + str;
        str = str.replace( /(id|class|onclick|ondblclick|accesskey|data|dynsrc|tabindex|name)="[\S ][^"]+"/g, "" )
                //.replace( / style=[ \w="-:\/\/:#;]+/ig, "" )             // style="xxxx"
                .replace( /label=[\u4e00-\u9fa5 \w="-:\/\/:#;]+"/ig, "" )  // label="xxxx"
                .replace( / finallycleanhtml=[\u4e00-\u9fa5 \w="-:\/\/:#;]+"/ig, "" )  // finallycleanhtml="xxxx"
                //.replace( /<img[ \w="-:\/\/?!]+>/ig, "" )                // <img>
                .replace( /<simpread-img/ig, "<img" )                      // <simpread-img>  → <img>
                .replace( /<\/simpread-img>/ig, "</img>" )                 // </simpread-img> → </img>
                .replace( /data[-\w]*=[ \w=\-.:\/\/?!;+"]+"[ ]?/ig, "" )   // data="xxx" || data-xxx="xxx"
                .replace( /href="javascript:[\w()"]+/ig, "" )              // href="javascript:xxx"
                .replace( /sr-blockquote/ig, "blockquote" )                // sr-blockquote to blockquote
                .replace( /<p[ -\w*= \w=\-.:\/\/?!;+"]*>/ig, "" )          // <p> || <p > || <p xxx="xxx">
                //.replace( /<figcaption[ -\w*= \w=\-.:\/\/?!;+"]*>/ig, "" ) // <figcaption >
                //.replace( /<\/figcaption>/ig, "" )                        // </figcaption>
                .replace( /<(figcaption|figure)/ig, "<div" )               // <figcaption|figure>  → <div>
                .replace( /<\/(figcaption|figure)>/ig, "</div>" )          // </figcaption|figure> → </div>
                .replace( /<\/br>/ig, "" )                                 // </br>
                .replace( /<br>/ig, "<br></br>" )
                .replace( / >/ig, ">" )
                .replace( /<\/p>/ig, "<br></br>" );

        return str;

    } catch( error ) {
        return `<div>转换失败，原文地址 <a href="${url}" target="_blank">${url}</a></div>`
    }
}

/**
 * Markdown to ENML
 * 
 * @param {string} str
 * @return {string} format str
 */
function md2enml( result ) {
    result = result.replace( /</ig, "&lt;" ).replace( />/ig, "&gt;" );
    let str = "";
    result.split( "\n" ).forEach( item => str += `<div>${item}</div>` );
    return str;
}

/**
 * Multi to ENML
 * 
 * @param {string} str
 * @return {string} format str
 */
function multi2enml( str ) {
    return str.replace( / data-\S+">/ig, ">" )
              .replace( /sr-[\w-]+/ig, "div" )
              .replace( /dangerouslysetinnerhtml="\[object Object\]"/ig, "" );
}

/**
 * Clear Html to MD, erorr <tag>
 * 
 * @param {string} convert string
 * @param {boolen} header
 * 
 * @return {string} format string
 */
function clearMD( str, header = true ) {
    header && ( str = `> 本文由 [简悦 SimpRead](http://ksria.com/simpread/) 转码， 原文地址 ${ window.location.href } \r\n\r\n ${str}` );
    str = str.replace( /<\/?(ins|font|span|div|canvas|noscript|fig\w+)[ -\w*= \w=\-.:&\/\/?!;,%+()#'"{}\u4e00-\u9fa5]*>/ig, "" )
             .replace( /sr-blockquote/ig, "blockquote" )
             .replace( /<\/?style[ -\w*= \w=\-.:&\/\/?!;,+()#"\S]*>/ig, "" )
             .replace( /(name|lable)=[\u4e00-\u9fa5 \w="-:\/\/:#;]+"/ig, "" )
             return str;
}

/**
 * Exclusion
 * 
 * @param  {object} minimatch
 * @param  {object} simpread.read
 * @return {boolen} true: not exist; false: exist
 */
function exclusion( minimatch, data ) {
    const url = window.location.origin + window.location.pathname;
    return data.exclusion.findIndex( item => {
        item = item.trim();
        return item.startsWith( "http" ) ? minimatch( url, item ) : item == data.site.name;
    }) == -1 ? true : false;
}

/**
 * Whitelist
 * 
 * @param  {object} minimatch
 * @param  {object} simpread.read
 * @return {boolean} 
 */
function whitelist( minimatch, data ) {
    const url = window.location.origin + window.location.pathname;
    return data.whitelist.findIndex( item => {
        item = item.trim();
        return item.startsWith( "http" ) ? minimatch( url, item ) : item == data.site.name;
    }) != -1 ? true : false;
}

export {
    verifyHtml     as verifyHtml,
    html2enml      as HTML2ENML,
    md2enml        as MD2ENML,
    multi2enml     as MULTI2ENML,
    clearMD        as ClearMD,
    exclusion      as Exclusion,
    whitelist      as Whitelist,
}