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parse.js
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parse.js
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var fs = require("fs");
var ASTY = require("asty");
var PEG = require("pegjs");
var PEGUtil = require("pegjs-util");
var asty = new ASTY();
var parser = PEG.generate(fs.readFileSync("rule.pegjs", "utf8"));
var result = PEGUtil.parse(parser, fs.readFileSync(process.argv[2], "utf8"), {
startRule: "PROGRAM",
makeAST: function (line, column, offset, args) {
return asty.create.apply(asty, args).pos(line, column, offset);
}
})
var dic={};
if (result.error !== null)
console.log("ERROR: Parsing Failure:\n" +
PEGUtil.errorMessage(result.error, true).replace(/^/mg, "ERROR: "));
else{
console.log(result.ast.dump().replace(/\n$/, ""));
interpret(result.ast, dic);
}
function getVal(val, dic){
switch(typeof(val)){
case "number":
return val;
case "boolean":
if(val) return true;
else if(!val) return false;
case "string":
if(dic[val]!=undefined) return dic[val];
else console.log("undefine: ", val);
default:
console.log("error when getting value: ", val);
}
}
function interpret(node, dic){
switch(node.T){
case "Number":
return node.A["num"];
case "Variable":
return node.A["id"];
case "BoolVal":
return node.A["bool"];
case "Program":
node.C.forEach(child => interpret(child,dic));
break;
case "PrintNum":
let num = getVal(interpret(node.C[0],dic),dic);
console.log("ans: ", num);
break;
case "PrintBool":
let bool = getVal(interpret(node.C[0],dic),dic);
if(bool) console.log("ans: ", "#t");
else console.log("ans: ", "#f");
break;
case "DefStmt":
let variable = interpret(node.C[0],dic);
let id = interpret(node.C[1],dic);
try{
dic[variable] = id;
}catch(e){
console.log(id, "re-defined, ", "err: ", e);
}
break;
case "FunCall":
// funInfo = [funIds, funBodyTree], from FunExp
let funInfo = interpret(node.C[0],dic);
if(node.C[0].T == "Variable") funInfo = dic[funInfo];
let params = [];
(node.C.slice(1)).forEach( child => params.push(interpret(child,dic)) );
var funDic={};
for (let i = 0; i < params.length; i++)
funDic[funInfo[0][i]]=params[i];
return getVal(interpret(funInfo[1], funDic),funDic);
case "FunExp":
let funIds = [],
funBodyTree = node.C[node.C.length-1];
(node.C.slice(0,node.C.length-1)).forEach( child=>funIds.push(interpret(child,dic)) );
return [funIds, funBodyTree];
// return (function(funIds, funDic){
// var funDoc = {};
// funIds.forEach( id => funDic[id]=funIds);
// interpret(funBody, funDic);
//});
case "IfExp":
if(interpret(node.C[0],dic)) return interpret(node.C[1],dic);
else return interpret(node.C[2],dic);
case "Plus":
let plusAns=0;
node.C.forEach(child => plusAns+=getVal(interpret(child,dic),dic));
return plusAns;
case "Minus":
let minuend = getVal(interpret(node.C[0],dic),dic),
subtrahend = getVal(interpret(node.C[1],dic),dic);
return minuend - subtrahend;
case "Multiply":
let mulAns=1;
node.C.forEach(child => mulAns*=getVal(interpret(child,dic),dic));
return mulAns;
case "Devide":
let dividend = getVal(interpret(node.C[0],dic),dic),
divisor = getVal(interpret(node.C[1],dic),dic);
return parseInt(dividend / divisor);
case "Mod":
let mod1 = getVal(interpret(node.C[0],dic),dic),
mod2 = getVal(interpret(node.C[1],dic),dic);
return mod1 % mod2;
case "Greater":
let greater1 = getVal(interpret(node.C[0],dic),dic),
greater2 = getVal(interpret(node.C[1],dic),dic);
return greater1 > greater2;
case "Smaller":
let smaller1 = getVal(interpret(node.C[0],dic),dic),
smaller2 = getVal(interpret(node.C[1],dic),dic);
return smaller1 < smaller2;
case "Equal":
let equal1 = getVal(interpret(node.C[0],dic),dic),
equal2 = getVal(interpret(node.C[1],dic),dic);
return equal1 == equal2;
case "AndOp":
let andAns = true;
node.C.forEach(child => andAns=andAns&&getVal(interpret(child,dic),dic));
return andAns;
case "OrOp":
let orAns = false;
node.C.forEach(child => orAns=orAns||getVal(interpret(child,dic),dic));
return orAns;
case "NotOp":
return !interpret(node.C[0],dic);
default:
console.log("interpret error");
}
}