Add embeddir

8 Embeddir/res/wwwroot/calc.js

@@ -0,0 +1,138 @@
+const answer = document.getElementById('answer');
+function cls()
+{
+    answer.value = '';
+}
+function append(c)
+{
+    answer.value += c;
+}
+function lex()
+{
+    var lexed = [];
+    var builder = "";
+    var flush = ()=>{
+        if(builder.length > 0)
+        {
+            lexed.push(builder);
+            builder = "";
+        }
+    }
+    var val = answer.value;
+    for(i=0;i<val.length;i++)
+    {
+        switch(val.at(i))
+        {
+            case '.':
+            case '(':
+            case ')':
+            case '^':
+            case '-':
+            case '*':
+            case '/':
+            case '+':
+            {
+                flush();
+                lexed.push(val.at(i));
+            }
+                break;
+            default:
+                builder += val.at(i);
+                break;
+        }
+    }
+    flush();
+
+    return lexed;
+}
+function parse_value(d)
+{
+    if(d.i < d.lexed.length && d.lexed[d.i] == '(')
+    {
+        d.i++;
+       var v= parse_add(d);
+       d.i++;
+       return v;
+    }
+
+    j = parseInt(d.lexed[d.i++]);
+    if(d.lexed[d.i] == '.')
+    {
+        d.i++;
+       j= parseFloat(`${j}.${d.lexed[d.i++]}`);
+    }
+    return j;
+}
+function parse_pow(d)
+{
+    var r = parse_value(d);
+    while(d.i<d.lexed.length && d.lexed[d.i] == "^")
+    {
+         
+             d.i++;
+             
+             var l = parse_value(d);
+             
+           r= Math.pow(r,l);
+         
+    }
+    return r;
+}
+function parse_times(d)
+{
+    var r = parse_pow(d);
+    while(d.i<d.lexed.length && (d.lexed[d.i] == "*" || d.lexed[d.i] == "/"))
+    {
+         if(d.i<d.lexed.length && d.lexed[d.i] == "*")
+         {
+             d.i++;
+             
+             var l = parse_pow(d);
+             r *= l;
+         }
+         if(d.i<d.lexed.length && d.lexed[d.i] == "/")
+         {
+             d.i++;
+            
+             var l = parse_pow(d);
+             r /= l;
+         }
+    }
+    return r;
+}
+function parse_add(d)
+{
+   var r = parse_times(d);
+   while(d.i<d.lexed.length && (d.lexed[d.i] == "+" || d.lexed[d.i] == "-"))
+   {
+        if(d.i<d.lexed.length && d.lexed[d.i] == "+")
+        {
+            d.i++;
+           
+            var l = parse_times(d);
+            r += l;
+            
+        }
+        if(d.i<d.lexed.length && d.lexed[d.i] == "-")
+        {
+            d.i++;
+            var k = r;
+            var l = parse_times(d);
+            
+            r -= l;
+            
+        }
+   }
+   return r;
+}
+function calculate()
+{
+    var lexed = lex();
+   
+    var d = {
+        i: 0,
+        lexed: lexed
+    }
+ 
+    answer.value = parse_add(d).toString();
+}