window.onload = function(){ var input = document.getElementById("writingArea"); var output = document.getElementById("output"); var viewport = document.getElementById("viewport"); function updateViewport(){ var codes = input.value; codes = codes.replace(/\bsvar /g,"svar "); codes = codes.replace(/\bprint /g,"print "); codes = codes.replace(/ \+ /g," + "); codes = codes.replace(/ - /g," - "); codes = codes.replace(/ \* /g," * "); codes = codes.replace(/ \/ /g," / "); codes = codes.replace(/ % /g," % "); codes = codes.replace(/ = /g," = "); codes = codes.replace(/;/g,";"); var numsRep = function(x){ var rg = new RegExp(x,"g"); return codes.replace(rg,""+x+""); } for(var n = 0; n <= 10; n++){ codes = numsRep(n); } viewport.innerHTML = codes; viewport.scrollTop = input.scrollTop; } input.addEventListener("input",updateViewport); updateViewport(); function returnExp(x){ var vValue = x; vValue = vValue.replace(/\+/g," + ").replace(/-/g," - ").replace(/\*/g," * ").replace(/\//g," / ").replace(/%/g," % ").replace(/ /g," "); var parts = vValue.split(" "); var variableValue = ""; for(var y = 0; y < parts.length; y++){ if(Number(parts[y])){ variableValue += parts[y]; } else if(parts[y] == "+" || parts[y] == "-" || parts[y] == "*" || parts[y] == "/" || parts[y] == "%"){ variableValue += parts[y]; } else{ variableValue += "variables['"+parts[y]+"']"; } } return variableValue; } function interprate(x){ var variables = {}; var output = ""; if(x.trim().endsWith(";")){ var arr = x.split(";"); for(var n = 0; n < arr.length-1; n++){ arr[n] = arr[n].trim(); if(arr[n].includes("\n")){ return "Syntax Error at line "+(n+1)+" : (;) missing"; } if(arr[n].startsWith("svar ")){ arr[n] = arr[n].slice(5).trim(); if(!arr[n].includes(" ")){ variables[arr[n]] = undefined; } else { if(!arr[n].includes("=")){ return "Syntax error at line " + (n+1) +""; } else { if(arr[n].split("=")[0].trim().includes(" ")){ return "Invalid variable name at line "+(n+1); } else { var vName = arr[n].split("=")[0].trim(); var vValue = arr[n].split("=")[1].trim(); if(vValue.startsWith('"')){ if(vValue.endsWith('"')){ vValue = vValue.slice(1,vValue.length-1); } else { return "Syntax error at line " + (n+1) +""; } } else { var variableValue = returnExp(vValue); if(eval(variableValue) != undefined){ vValue = eval(variableValue); } else{ return "Unexpected token at line "+(n+1)+""; } } variables[vName] = vValue; //alert(vName); //alert(vValue); } } } } else if(arr[n].startsWith("print ")){ arr[n] = arr[n].slice(6); var variableValue = returnExp(arr[n]); if(eval(variableValue) != undefined){ vValue = eval(variableValue); } else{ return "Unexpected token at line "+(n+1)+""; } //alert(vValue); output += vValue+"
"; } else{ if(!arr[n].includes("=")){ return "Syntax error at line " + (n+1) +""; } else { if(arr[n].split("=")[0].trim().includes(" ")){ return "Invalid variable name at line "+(n+1); } else { var vName = arr[n].split("=")[0].trim(); if(variables.hasOwnProperty(vName)){ //alert(true); } else { return ""+vName +" is not defined at line "+(n+1)+""; } var vValue = arr[n].split("=")[1].trim(); if(vValue.startsWith('"')){ if(vValue.endsWith('"')){ vValue = vValue.slice(1,vValue.length-1); } else { return "Syntax error at line " + (n+1) +""; } } else { var variableValue = returnExp(vValue); if(eval(variableValue) != undefined){ vValue = eval(variableValue); } else{ return "Unexpected token at line "+(n+1)+""; } } variables[vName] = vValue; //alert(vName); //alert(vValue); } } } } return output; } else{ return "Syntax error at last line: (;) missing"; } } document.getElementById("run").addEventListener("click",function(){ output.innerHTML = interprate(input.value); }); }

Interpreter 💜SL Script💜