File: proglang.html
<!DOCTYPE html>
<html>
<head>
<title>My programming language</title>
<link rel="stylesheet" type="text/css" href="proglangstyle.css"></link>
<script type="text/javascript" src="proglangscript.js"></script>
</head>
<body>
<div id="codearea">
<h3>Enter your code here</h3><br>
<textarea id="code" rows=10></textarea>
</div>
<div id="outputarea">
<h3>Output</h3><br>
<textarea id="output" rows=10></textarea>
</div>
<div>
<input type=button id="run" value="Compile and run"></input>
<input type=button id="check" value="check variable values"></input>
<input type=button id="clear" value="Clear all"></input>
</div>
<div id="rules">
<h4>Syntax rules</h4>
<p>
More like assembley language.<br>
Data types<br>
number --> integer<br>
text --> single word surrounded by single quotes<br>
<br>
Note:<br>
Variables automatically get declared if not declared already when used in destination field (eg: add a,10 //creates a variable a and stores 10 in it)<br>
Spacing is strict. only one space in a statement and it is placed between keyword and arguments.<br>
adding texts leads to concatenation<br>
<br>
Instructions:<br>
mov dest,src //dest=src<br>
mov variable,number<br>
mov variable,text<br>
mov variable,variable<br>
<br>
add dest,src //dest=dest+src<br>
add variable,number<br>
add variable,text<br>
add variable,variable<br>
<br>
similarly sub,mul,div works<br>
<br>
show varlist<br>
varlist --> variables separated by commas (eg:show a,b,c)<br>
It prints values of the variables listed<br>
</p>
</div>
<div id="sampleprogram">
<h4>Sample Program</h4>
<p>
mov a,10<br>
add a,20<br>
mov name,'raj'<br>
add name,'kumar'<br>
mov b,2<br>
mul c,8<br>
div c,b<br>
show a,b,c,name<br>
</p>
</div>
</body>
</html>
File: proglangscript.js
window.onload=initAll;
var vartable;
var output;
function initAll()
{
initialize();
document.getElementById("run").onclick=getCode;
document.getElementById("check").onclick=checkVarValue;
document.getElementById("clear").onclick=clearAll;
}
function initialize()
{
vartable={};
output="";
}
function clearAll()
{
document.getElementById("code").value="";
document.getElementById("output").value="";
}
function checkVarValue()
{
var varname=prompt("Enter variable name:","");
if(varname)
alert(vartable[varname]);
}
function getString(str) //returns string after removing quotes
{
return str.substr(1,str.length-2);
}
function whatIs(x) //returns whether x is a number or variable or text
{
var textpattern=new RegExp("\'.*\'");
if(isNaN(x))
{
if(vartable[x])
return "var";
else if(textpattern.test(x))
return "text";
}
else
return "num";
}
function move(movstmt) //code for processing move statement
{
var param=movstmt.split(",");
var dest=param[0];
var src=param[1];
switch(whatIs(src))
{
case "num":
vartable[dest]=parseInt(src);
break;
case "text":
vartable[dest]=getString(src);
break;
case "var":
vartable[dest]=vartable[src];
break;
}
}
function show(showstmt) //prints variables given
{
var variables=showstmt.split(",");
for(var i=0;i<variables.length;i++)
{
output+=variables[i]+" : "+vartable[variables[i]]+"\n";
}
document.getElementById("output").value=output;
}
function operate(stmt,operator) //code for processing div statement
{
var param=stmt.split(",");
var dest=param[0];
var src=param[1];
switch(whatIs(src))
{
case "num": //source is a number
if(vartable[dest]) //checking if source exists
{
if(isNaN(vartable[dest]))
{
alert("cannot handle number operating on text");
break;
}
switch(operator)
{
case '+':
vartable[dest]+=parseInt(src);
break;
case '-':
vartable[dest]-=parseInt(src);
break;
case '*':
vartable[dest]*=parseInt(src);
break;
case '/':
vartable[dest]/=parseInt(src);
break;
}
}
else
{
vartable[dest]=parseInt(src);
}
break;
case "text":
if(operator=='+')
{
if(vartable[dest])
{
if(!isNaN(vartable[dest]))
{
alert("cannot add text to number");
break;
}
vartable[dest]+=getString(src);
}
else
{
vartable[dest]=getString(src);
}
}
else
alert("not possible");
break;
case "var":
if(vartable[dest])
{
switch(operator)
{
case '+':
vartable[dest]+=vartable[src];
break;
case '-':
vartable[dest]-=vartable[src];
break;
case '*':
vartable[dest]*=vartable[src];
break;
case '/':
vartable[dest]/=vartable[src];
break;
}
}
else
{
vartable[dest]=vartable[src];
}
break;
}
}
function process(instructions) //main code for processing each statement
{
for(var i=0;i<instructions.length;i++)
{
var stmt=instructions[i].split(" ");
var keyword=stmt[0];
switch(keyword)
{
case "mov":
move(stmt[1]);
break;
case "add":
operate(stmt[1],'+');
break;
case "sub":
operate(stmt[1],'-');
break;
case "mul":
operate(stmt[1],'*');
break;
case "div":
operate(stmt[1],'/');
break;
case "show":
show(stmt[1]);
break;
default:
alert("something wrong with the keyword at line "+(i+1));
}
}
}
function getCode() //gets text from text area and splits them into instructions for processing
{
initialize();
var code=document.getElementById("code").value;
code=code.trim();
var instructions=code.split("\n");
process(instructions);
}
File: proglangstyle.css
body{
background-color:#EEEEFF;
}
#codearea{
float:left;
width:45%;
margin:5px;
}
#outputarea{
float:left;
width:45%;
margin:5px;
}
#rules{
width:45%;
float:left;
margin:5px;
background-color:#EEEFF5;
}
#sampleprogram{
width:45%;
float:left;
margin:5px;
background-color:#EEEEF5;
}
input{
float:left;
width:25%;
margin:3px;
}
textarea{
width:90%;
height:90%
}
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