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//By Chris Xiong, 2018
//License: Expat
let p=null;
let Caption;
let Choices;
let Score;
let Next;
let values=[];
let curq;
function evalexpr(e)
{
let ret=0;
let op=function(a,o,b){
switch(o){
case '+':return a+b;
case '-':return a-b;
case '*':return a*b;
case '/':return a/b;
}
};
for(let p=e.match(/[+\-*\/]/);p;p=e.match(/[+\-*\/]/))
{
let vp=e.match(/[A-Za-z]\w*/);
if(vp)
{
const v=vp[0];
if(values[v]===undefined)throw 'shit';
ret=op(ret,p[0],values[v]);
e=e.substr(vp.index+vp[0].length);
}
else
{
let np=e.match(/\d+(.\d*)?/);
if(np)
{
const n=Number(np[0]);
ret=op(ret,p[0],n);
e=e.substr(np.index+np[0].length);
}else throw 'shit';
}
}
return ret;
}
function evalsetexpr(e)
{
const s=e.split('=');
if(s.length<2)throw 'shit';
values[s[0].trim()]=evalexpr(s[1]);
}
function evaltestexpr(e)
{
const m=e.match(/([A-Za-z]\w*)\s*(leq|geq|lt|gt)\s*([A-Za-z0-9.]*)/);
if(!m)throw 'shit';
const v=m[1],op=m[2],vr=m[3];
const vv=values[v];
const vvr=isNaN(Number(vr))?values[vr]:Number(vr);
if(vv===undefined||vvr===undefined)throw 'shit';
switch(op.trim())
{
case 'leq':return vv<=vvr;
case 'geq':return vv>=vvr;
case 'lt':return vv<vvr;
case 'gt':return vv>vvr;
}
throw 'shit';
}
function evalcondexpr(e)
{
if(!e.trim().length)return true;
let ret=false;
let op=function(a,o,b){
switch(o){
case '|':return a||b;
case '&':return a&&b;
}
};
for(let p=e.search(/[|&]/);p!=-1;p=e.search(/[|&]/))
{
let np=e.substr(p+1).search(/[|&]/);
let n=e.substr(p+1,np!=-1?np-1:undefined);
ret=op(ret,e[p],evaltestexpr(n.trim()));
e=np?e.substr(np):"";
}
return ret;
}
function initq()
{
const q=p.question[curq];
for(let i=0;i<q.initialization.length;++i)
{
if(evalcondexpr(q.initialization[i].c))
evalsetexpr(q.initialization[i].s);
}
if(!evalcondexpr(q.precond)){++curq;if(curq<p.question.length)initq();else finalize();}
}
function evalq()
{
if(curq>=p.question.length)return;
const q=p.question[curq];
let seln=0;
for(let i=0;i<q.choice.length;++i)
{
const e=document.getElementById(`choice${i}`);
if(e.checked)++seln;
if(e.checked)
{
for(let j=0;j<q.choice[i].setp.length;++j)
if(evalcondexpr(q.choice[i].setp[j].c))
evalsetexpr(q.choice[i].setp[j].s);
}
else
{
for(let j=0;j<q.choice[i].setn.length;++j)
if(evalcondexpr(q.choice[i].setn[j].c))
evalsetexpr(q.choice[i].setn[j].s);
}
}
if(!seln&&q.type=='single'){alert('Wanna cheat?...');return;}
++curq;
if(curq==p.question.length)finalize();else{showq();initq();}
}
function showq()
{
const q=p.question[curq];
Caption.innerHTML=q.caption;
while(Choices.firstChild)Choices.removeChild(Choices.firstChild);
for(let i=0;i<q.choice.length;++i)
{
const d=document.createElement('div');
const e=document.createElement('input');
e.type=q.type=='multi'?'checkbox':'radio';
e.innerHTML=q.choice[i].caption;
e.qid=i;e.id=`choice${i}`;
e.setAttribute('name','choice');
e.classList.add('check');
const l=document.createElement('label');
l.innerHTML=q.choice[i].caption;
l.setAttribute('for',e.id);
d.appendChild(e);
d.appendChild(l);
Choices.appendChild(d);
}
Score.innerHTML=`${values['score']}, Question ${curq+1}/${p.question.length}`;
}
function _init()
{
Caption=document.getElementById('qcaption');
Choices=document.getElementById('qchoices');
Score=document.getElementById('score');
Next=document.getElementById('nextbtn');
curq=0;values['score']=0;
initq();showq();
}
async function init()
{
const resp=await fetch(new Request('/blog/data/applefan.json'));
r=await resp.text();
p=JSON.parse(r);
_init();
}
function finalize()
{
Next.style.color='#888';
Score.innerHTML=`${values['score']}, Question ${p.question.length}/${p.question.length}`;
Caption.innerHTML='';
Choices.innerHTML='';
for(let i=0;i<p.verdict.length;++i)
if(evalcondexpr(p.verdict[i].precond))
Caption.innerHTML+=p.verdict[i].caption;
}
init();
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