转换轻国论坛帖子到epub. 用法: 0.切换到只看楼主模式 1.鼠标选取章节 2. 猴子扩展里的按钮开始运行 3. 完成后帖子标题转为下载链接

lightnovel2epub.test.js

// ==UserScript==
// @name lightnovel2epub
// @description 快速输出半成品epub3.0
// @author KCC
// @version 0.99.25
// @namespace lightnovel2epub
// @match *://www.lightnovel.us/forum.php*
// @match *://www.lightnovel.cn/forum.php*
// @require https://github.com/Stuk/jszip/raw/master/dist/jszip.min.js
// @grant GM_registerMenuCommand
// @grant GM_setClipboard
// @grant GM_xmlhttpRequest
// ==/UserScript==

var Ngen = (function* () { var i = 0; while(true) {yield '_' + (i++).toString() + '.jpeg';}})();

var Pstarter = () => {
  var rD,rP;
  rP = new Promise((D,F) => {rD = D;});
  return [rP,rD];
};

var GM_ajax = (b={}) => new Promise((D,F) => {
  b.onload = (e) => D(e),
  b.onerror = (e) => F(e);
  GM_xmlhttpRequest(b);
});

var ajax = (b={}) => new Promise((D,F) => {
  let xhr = new XMLHttpRequest();
  xhr.onload = (e) => D(e),
  xhr.onerror = (e) => F(e);
  xhr.open(b.method, b.url);
  xhr.responseType = b.responseType;
  xhr.send();
});

var f = e => {
  var d = document.createElement('div');
  if(e.nodeName == '#text') {
    let ne = document.createElement('p');
    ne.textContent = e.textContent.trim();
    d.append(ne);
    if(ne.textContent.indexOf('作者')!=-1 
    && ne.textContent.split(/\s/).join('').split(/[：:]/).length==2
    && opf.split('{{creator}}').length > 1) {
      opf=opf.split('{{creator}}').join(ne.textContent.split(/\s/).join('').split(/[：:]/)[1]);
      console.log('lightnovel2epub: create epub <p> <img>');
    }
  } else
  if(e.nodeName == 'IGNORE_JS_OP') {
    var ne = document.createElement('img');
    let sfile = e.querySelector('strong')||e.querySelector('a[id]')
    if (sfile) {
      ne.setAttribute('srcepub', 'images/' + sfile.textContent.split(/\s/).join('') + Ngen.next().value);
      ne.setAttribute('srclink', e.querySelector('a').getAttribute('href'));
    } else {ne = document.createElement('p');}
    d.append(ne);
  } else
  if(e.nodeName == 'IMG' && e.hasAttribute('file')) {
    let ne = document.createElement('img');
    if (IMGfix) {
      let url = 'http' + e.getAttribute('file').split('https')[1];
      e.src = url;
      e.setAttribute('file', url);
    }
    ne.setAttribute('srcepub', 'images/' + e.getAttribute('file').split('?')[0].split('/').pop() + Ngen.next().value)
    ne.setAttribute('srclink', e.getAttribute('file'));
    d.append(ne);
  } else if(e.className != 'locked')
  {
    d.append(...[...e.childNodes].map(f).reduce((a, e) => a.concat([...e.childNodes]),[]));
  }
  return d;
};

var img_1 = e => {
  let sblob = URL.createObjectURL(e.response),
       timg = document.createElement('img');
         Pr = new Promise((D, F) => {
           timg.addEventListener('load',() => D(timg))
          ,timg.addEventListener('error',() => F(timg));
          });
   timg.src = sblob;
  //URL.revokeObjectURL(sblob);
  return Pr;
};

var img_2 = (timg) => {
  var Pr;
  if (timg.naturalWidth > timg.naturalHeight) {
    let    tscanvas = document.createElement('canvas'),
           tdcanvas = document.createElement('canvas');
     tscanvas.width = timg.naturalWidth,
    tscanvas.height = timg.naturalWidth,
     tdcanvas.width = timg.naturalHeight,
    tdcanvas.height = timg.naturalWidth;
                tsC = tscanvas.getContext('2d'),
                tdC = tdcanvas.getContext('2d'),
                thh = ~~(timg.naturalHeight/2);
    tsC.translate(thh, thh),
    tsC.rotate(90 * Math.PI / 180),
    tsC.drawImage(timg, -thh, -thh),
    tdC.drawImage(tscanvas, 0, 0);
    Pr = new Promise((D, F) => tdcanvas.toBlob(D, 'image/jpeg', 1));
  } else {
    let    tscanvas = document.createElement('canvas');
     tscanvas.width = timg.naturalWidth,
    tscanvas.height = timg.naturalHeight;
                tsC = tscanvas.getContext('2d'),
    tsC.drawImage(timg, 0, 0),
    Pr = new Promise((D, F) => tscanvas.toBlob(D, 'image/jpeg', 1));
  }
  return Pr;
};

console.log('lightnovel2epub: IMG url testing ...');
var IMGfix = 0;
var querySelectorIMG = document.querySelector('[id*=postmessage_] img[id],.pattl img[id]');
if (querySelectorIMG) {
  GM_ajax({
    method: "HEAD",
    url: querySelectorIMG.getAttribute('file'),
  })
  .then(() => console.log('lightnovel2epub: IMG testing OK'))
  .catch((r) => {
    [...document.querySelectorAll('[id*=postmessage_] img[id],.pattl img[id]')]
    .forEach(e => {
      let url = 'http' + e.getAttribute('file').split('https')[1];
      e.src = url;
      e.setAttribute('file', url);
    });
    IMGfix = 1;
    console.log('lightnovel2epub: IMG url fixed');
  });
}

console.log('lightnovel2epub: zip loading');
var epub = new JSZip();
epub.file("mimetype", "application/epub+zip");
epub.file("META-INF/container.xml", '<?xml version="1.0" encoding="UTF-8"?>\n<container xmlns="urn:oasis:names:tc:opendocument:xmlns:container" version="1.0">\n<rootfiles>\n<rootfile full-path="OEBPS/content.opf" media-type="application/oebps-package+xml"/>\n</rootfiles>\n</container>');
epub.file("OEBPS/main.css", "img{\ndisplay: block;\nmargin: 0 auto;\n}");

var opf = '<?xml version="1.0" encoding="UTF-8"?>\n<package xmlns="http://www.idpf.org/2007/opf" version="3.0" unique-identifier="uid">\n<metadata xmlns:dc="http://purl.org/dc/elements/1.1/">\n<dc:identifier id="uid">{{uid}}</dc:identifier>\n<dc:title>{{title}}</dc:title>\n<dc:creator>{{creator}}</dc:creator>\n<dc:language>zh</dc:language>\n<meta property="dcterms:modified">{{time}}</meta>\n</metadata>\n<manifest>\n<item href="main.xhtml" id="main" media-type="application/xhtml+xml"/>\n<item href="nav.xhtml" id="nav" media-type="application/xhtml+xml" properties="nav"/>\n<item href="main.css" media-type="text/css" id="css"/>\n<item href="images/main_cover.jpeg" media-type="image/jpeg" id="cover" properties="cover-image"/>\n{{images}}</manifest>\n<spine>\n<itemref idref="main"/>\n<itemref idref="nav" linear="no"/>\n</spine>\n</package>';
var opf_img = '<item href="{{srcepub}}" media-type="image/jpeg" id="{{file}}" />\n';
var nav = '<?xml version="1.0" encoding="utf-8"?>\n<html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops">\n<head>\n<meta charset="utf-8" />\n<title>Table of Contents</title>\n<link rel="stylesheet" type="text/css" href="main.css" />\n</head>\n<body>\n<nav epub:type="toc" id="toc">\n<h1 class="title">Table of Contents</h1>\n<ol>\n<li id="main"><a href="main.xhtml">{{title}}</a></li>\n{{nav}}\n<li id="nav"><a href="nav.xhtml">Table of Contents</a></li>\n</ol>\n</nav>\n</body>\n</html>';
var nav_p = '<li id="{{p}}"><a href="main.xhtml#{{p}}">{{h}}</a></li>\n';
var xhtml = '<?xml version="1.0" encoding="utf-8"?>\n<html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops">\n<head>\n<meta charset="utf-8"/>\n<title>{{title}}</title>\n<link rel="stylesheet" type="text/css" href="main.css"/>\n</head>\n<body>\n{{main}}\n</body>\n</html>';
var xhtml_h ='<h3 id="{{p}}">{{h}}</h3>\n';


var [P_doc, doc_end] = Pstarter();
var [P_img_s, img_start] = Pstarter();
var [P_cover_s, cover_start] = Pstarter();
var [P_img_e, img_end] = Pstarter();
var [P_cover_e, cover_end] = Pstarter();
var final_list = [P_doc,P_img_e,P_cover_e];

var ss;

let Mf = (D,F) => {
console.log('lightnovel2epub: start! loading all page');
ss = window.getSelection().toString().split('\n').map(e => e.trim());

var pgl = [];
if (document.querySelector('.pg span')) {
  let maxpg = Number(document.querySelector('.pg span').innerText.split(/[^\d]/).join(''));
  let URL = document.documentURI.split(/&page=\d+&/).join('&');
  for (let i=1; i <= maxpg; i++){
    pgl.push({
      method: "GET",
      url: URL+'&page='+i,
      responseType: "document",
    });
  }
} else {
let URL = document.documentURI.split(/&page=\d+&/).join('&');
pgl = [{
  method: "GET",
  url: URL,
  responseType: "document",
}];
};
console.log('lightnovel2epub: document do same thin');
Promise.all(pgl.map((e) => ajax(e)))
  .then((e) => e.map((e) => [...e.target.responseXML.querySelectorAll('[id*=postmessage_], .pattl')]))
  .then((e) => e.reduce((a, e) => a.concat(e),[])
                  .filter((e)    => !e.querySelector('.quote'))
                  .reduce((a, e) => a.concat([...e.childNodes]),[])
                  .filter((e)    => e.nodeName != 'I')
                  .map(f)
                  .reduce((a, e) => a.concat([...e.childNodes]),[])
  )
  .then((e) => {img_start(e.filter(E=>E.nodeName === 'IMG').map(E=>E.cloneNode()));
                console.log('lightnovel2epub: create epub img start');
                return e;
               })
  .then((e) => e.map(e => {if(e.nodeName == 'IMG') e.removeAttribute('srclink'); return e.outerHTML;})
                  .join('\n')
                  .split(/(?:<p><\/p>\n)+/).join('<p></p>\n')
                  .split('srcepub').join('src')
  )
  .then((End) => {
    ss.forEach((e,i) => {
      if (e) {
        End = End.replace(RegExp('^((?:.|\n)*)<p>'+ e.split(/\s/).join('').split('').join('\\s*?') +'</p>\n((?:.|\n)*?)$'), '$1'+ xhtml_h.split('{{h}}').join(e).split('{{p}}').join('main'+i).split('\n').join('') +'\n$2');
        nav = nav.split('{{nav}}').join(nav_p.split('{{h}}').join(e).split('{{p}}').join('main'+i)+'{{nav}}');
      }
    });
    End = End.replace(/^(<img.*?)>$/mg, '$1 />');
    return End;
  })
  .then((End) => {
    var tslt = document.querySelector('#thread_subject').innerText;
    xhtml = xhtml
      .split('{{main}}').join(End)
      .split('{{title}}').join(tslt);
    nav = nav
      .split('{{title}}').join(tslt);
    opf = opf
      .split('{{time}}').join(new Date().toJSON())
      .split('{{uid}}').join('UID'+new Date().getTime())
      .split('{{title}}').join(tslt);
    epub.file("OEBPS/main.xhtml", xhtml);
    epub.file("OEBPS/nav.xhtml", nav.split('{{nav}}').join(''));
    GM_setClipboard(End);
  })
  .then(() => doc_end());
};

P_img_s.then((e) => {
  Promise.all(
    e.map((e1, i) => GM_ajax(
      {
        method: "GET",
        url: e1.getAttribute('srclink'),
        responseType: "blob",
      })
    .then(e => img_1(e).then(e => [e, e1]))
    .catch(e => {
            console.log('lightnovel2epub: img load error');
            return 'error img load';
    })
    )
  )
  .then(a => a.filter(E => E !== 'error'))
  .then(a => {
    var cover_ed = 0;
    var tmp_end = a.filter(([e, E]) => {
      if (Math.max(e.naturalWidth, e.naturalHeight) >= 600) {
        if (!cover_ed) {
          cover_start(e);
          cover_ed = 1;
        }
        return true;
      } else {
        console.log('lightnovel2epub: img too small');
        return false;
      }
    });
    if (!tmp_end.length) {
      console.log('lightnovel2epub: no img');
      throw 'error no img';
    } else return tmp_end;
  })
  .then(a => a.map(([e, E]) => [img_2(e), E]))
  .then(a => a.map(([b, e]) => {
    var tmp_srcepub = e.getAttribute('srcepub');
    epub.file("OEBPS/"+tmp_srcepub, b);
    let temp_img = opf_img
      .split('{{srcepub}}').join(tmp_srcepub)
      .split('{{file}}').join(tmp_srcepub);
    opf = opf.split('{{images}}').join(temp_img+'{{images}}');
  }))
  .catch(cover_end)
})
.then(() => img_end());

P_cover_s.then((timg) => new Promise((D, F) => {
    console.log('lightnovel2epub: create epub cover img');
    if (timg.naturalWidth > timg.naturalHeight) {
        // bakacrop.js start
        var luma = (id, od) => {
          for (let i=0; i < id.length; i+=4) {
            od[i+1] = 0.21*id[i]+ 0.72*id[i+1]+ 0.07*id[i+2]
           ,od[i+3] = 255;
          }
        }

        var sobel_edge = (p1, p2, p3
                         ,p4,     p6
                         ,p7, p8, p9) => {

          let Gy =  p1+  2*p2+   p3 
                           + 
                   -p7+ -2*p8+  -p9,

              Gx =  p1     +    -p3+ 
                  2*p4     +  -2*p6+
                    p7     +    -p9;

          return (Math.abs(Gx) + Math.abs(Gy))/6;
        }

        var sobel = (id,o) => {
          var w4 = o.width*4
             ,isN = Number.isInteger;
          for (var l=0; l < o.height; l++) {
            for (var x=0; x < o.width; x++) {
              let p = l * w4 + x*4 +1;
              let p1 = isN(id[p-w4-4]) ? id[p-w4-4] : 255
                 ,p2 = isN(id[p-w4  ]) ? id[p-w4  ] : 255
                 ,p3 = isN(id[p-w4+4]) ? id[p-w4+4] : 255
                 ,p4 = isN(id[p   -4]) ? id[p   -4] : 255
                 ,p6 = isN(id[p   +4]) ? id[p   +4] : 255
                 ,p7 = isN(id[p+w4-4]) ? id[p+w4-4] : 255
                 ,p8 = isN(id[p+w4  ]) ? id[p+w4  ] : 255
                 ,p9 = isN(id[p+w4+4]) ? id[p+w4+4] : 255;
              o.data[p] = sobel_edge(p1, p2, p3
                                    ,p4,     p6
                                    ,p7, p8, p9);
            }
          }
        }

        var    tscanvas = document.createElement('canvas')
                    ,ys = Math.max(~~(Math.max(timg.naturalWidth, timg.naturalHeight)/1080),2);
         tscanvas.width = ~~(timg.naturalWidth /ys)
        tscanvas.height = ~~(timg.naturalHeight /ys);
                var tsC = tscanvas.getContext('2d');
        tsC.drawImage(timg, 0, 0, tscanvas.width, tscanvas.height);

        var i = tsC.getImageData(0, 0, tscanvas.width, tscanvas.height)
           ,o = new ImageData(tscanvas.width, tscanvas.height);
        var id = i.data
           ,od = o.data;

        luma(id, od);
        sobel(o.data.slice(), o);

        tsC.putImageData(o, 0, 0);

        var t = tsC.getImageData(0, 0, o.width, o.height)
          ,cw = ~~(o.height /1448*1072)
           ,s = [[], 0, []];
        for (var x=0; x < t.width; x++) {
          var _ls = 0;
          for (var l=0; l < t.height; l++) {
            let p = (x + t.width * l)*4 +1;
            _ls += t.data[p];
          }
          s[1] += _ls
         ,s[0].unshift(_ls);
          if (s[0].length === cw) {
            s[2].push(s[1])
           ,s[1] -= s[0].pop();
          }
        }
        var rx = s[2].indexOf(Math.max(...s[2])) * ys;

        let    tdcanvas = document.createElement('canvas');
         tdcanvas.width = ~~(timg.naturalHeight/1448*1072),
        tdcanvas.height = timg.naturalHeight,
                    tdC = tdcanvas.getContext('2d');
        tdC.drawImage(timg, rx, 0, tdcanvas.width, tdcanvas.height, 0, 0, tdcanvas.width, tdcanvas.height);
        // bakacrop.js end
        tdcanvas.toBlob(D, 'image/jpeg', 1);
    } else {
      let    tscanvas = document.createElement('canvas');
       tscanvas.width = timg.naturalWidth,
      tscanvas.height = timg.naturalHeight;
                  tsC = tscanvas.getContext('2d'),
      tsC.drawImage(timg, 0, 0),
      tscanvas.toBlob(D, 'image/jpeg', 1);
    }
  })
)
.then((b) => {
  epub.file("OEBPS/images/main_cover.jpeg", b);
  console.log('lightnovel2epub: create epub cover img end');
  cover_end();
})
.catch(e=>{
  console.log('lightnovel2epub: create epub cover img error');
});

Promise.all(final_list).then(v => {
  epub.file("OEBPS/content.opf", opf.split('{{images}}').join(''));
  console.log('lightnovel2epub: ziping');
  return epub.generateAsync({
    type: "blob",
    mimeType: "application/epub+zip",
    compression: "DEFLATE",
    compressionOptions: {level: 9}
  });
})
.then(u => {
  console.log('lightnovel2epub: Done!');
  console.debug(u);
  let fname = document.querySelector('#thread_subject').innerText+'.epub';
  var fhref = URL.createObjectURL(u);
  document.querySelector('#thread_subject').outerHTML = '<a id="thread_subject" href="'+ fhref +'" download="'+ fname +'">'+ fname +'</a>';
  location.href += '#thread_subject';
  window.addEventListener("close", function(event) {
    URL.revokeObjectURL(fhref);
  }, false);
});


GM_registerMenuCommand('lightnovel2epub: Run', Mf);

console.log('lightnovel2epub: JSZip.version='+JSZip.version);
//console.debug(GM_ajax);
//console.debug(final_list);
//P_img_s.then((e) => console.debug(e));