uweb/zh/searchurl/txt/mdkatex.html

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2022-10-20 09:04:24 +00:00
<head>
<base>
<script src="https://fastly.jsdelivr.net/npm/marked@3.0.7/marked.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/katex@0.13.11/dist/katex.min.js" crossorigin="anonymous"></script>
<script>
const renderer = new marked.Renderer();
var options = {
renderer: renderer,
pedantic: false,
gfm: true,
breaks: false,
sanitize: false,
smartLists: true,
smartypants: false,
xhtml: false
};
marked.setOptions(options);
function htmldecode(text){
var temp = document.createElement("div");
temp.innerHTML = text;
var output = temp.innerText || temp.textContent;
temp = null;
return output;
}
function mathsExpression(expr) {
if (expr.match(/^\$\$[\s\S]*\$\$$/)) {
expr = expr.substr(2, expr.length - 4);
return katex.renderToString(expr, { displayMode: true });
} else if (expr.match(/^\$[\s\S]*\$$/)) {
expr = htmldecode(expr); // temp solution
expr = expr.substr(1, expr.length - 2);
return katex.renderToString(expr, { displayMode: false });
}
}
const unchanged = new marked.Renderer()
renderer.code = function(code, lang, escaped) {
if (!lang) {
const math = mathsExpression(code);
if (math) {
return math;
}
}
return unchanged.code(code, lang, escaped);
};
renderer.codespan = function(text) {
const math = mathsExpression(text);
if (math) {
return math;
}
return unchanged.codespan(text);
};
function markedWithKatex(text) {
return marked(text, options);
}
function absFile(url) {
this.name=url;
this.slice = async(offset, length) =>{
const headers = new Headers();
headers.append('range', 'bytes=' + offset + '-' + ( offset + length -1).toString());
const opts = {
credentials: 'include',
headers : headers
};
const resp = await fetch( this.name, opts );
return await resp.arrayBuffer();
//alert(JSON.stringify(resp.headers));
//return await resp.text();
}
}
var file;
var blocksize = 20480;
function loadSlice(){
function render(u8array){
document.body.innerHTML = markedWithKatex(new TextDecoder().decode(u8array));
scroll(0,0);
}
function setPageUrl(pageurl){
let a = document.createElement('a');
a.href = "i:5c"+pageurl;
a.click();
}
var page = 1;
var extrasize = blocksize; //extrasize should <= blocksize
let lhash = location.hash;
if(lhash){
if("p"!==lhash.charAt(1)){//#offset=&[len]
let iAmpersand = lhash.indexOf('&',8);
let offset = parseInt(lhash.substring(8,iAmpersand));
let len = parseInt(lhash.substring(iAmpersand+1));
{//update urlInc() url
let href = location.href;
let iHash = href.indexOf('#');
href=href.substring(0,iHash)+"#page="+Math.floor((offset+len)/blocksize);
setPageUrl(href);
}
file.slice(offset,len).then((buffer)=>{
let u8 = new Uint8Array(buffer);
render(u8);
});
return;
}
//#page=
page = parseInt(lhash.substring(6));
}else
setPageUrl(location.href+"#page=1");
file.slice(blocksize*(page-1),blocksize+extrasize).then((buffer)=>{
let u8 = new Uint8Array(buffer);
let u8len = u8.length;
let iStart = 0;
let limit = Math.min(u8len,extrasize);
if(1!=page){
for(let i=1;i<limit;i=i+2){
if(10==u8[i] && 10==u8[i-1]) {
iStart = i+1;
break;
}
}
}
let iEnd = Math.min(u8len,blocksize);
limit = Math.min(u8len,blocksize+extrasize);
for(let i=blocksize+1;i<limit;i=i+2){
if(10==u8[i] && 10==u8[i-1]) {
iEnd = i+1;
break;
}
}
render(u8.slice(iStart,iEnd));
});
}
//?url=#offset=&[len]&page=
{
let url = location.search.substring(5);
file = new absFile(url);
document.getElementsByTagName('base')[0].href=url;
}
window.addEventListener('hashchange',loadSlice);
</script>
</head>
<body>
<script>loadSlice();</script>
</body>