Math++

import java.io.*;
import java.util.*;
import java.util.regex.*;
import javax.swing.JOptionPane;
import static java.lang.Math.*;

//Math++ 1.04 Reference Implementation

public class MathPlusPlus{
    static Map<Character,Double>vars=new HashMap<>();
    static Scanner in=new Scanner(System.in);
    static final double PHI=(1+sqrt(5))/2;
    static PrintStream log;
    static Map<Integer,Double>tape=new HashMap<>();
    static double expr(String e,int line){
        try{
        e=e.replaceAll("\\s","");
        log.println(e);
        if(e.equalsIgnoreCase("$pi"))return PI;
        if(e.equalsIgnoreCase("$phi"))return PHI;
        if(e.equalsIgnoreCase("$e"))return E;
        if(e.equalsIgnoreCase("$rand"))return Math.random();
        if(e.matches("^\\{(.+)\\}$")){
            e=e.replaceAll("^\\{(.+)\\}$","$1");
            return tape.getOrDefault((int)expr(e,line),0.0);
        }
        while(e.indexOf("(")!=-1){
            Matcher k=Pattern.compile("\\(([^()]+?)\\)").matcher(e);
            k.find();
            String g=k.group(1);
            log.println(g);
            double d=expr(g,line);
            e=e.replaceFirst("\\([^()]+?\\)",d<0?"(-"+d+")":""+d);
        }
        try{return Double.parseDouble(e);}catch(Exception x){}
        if(e.matches("[a-z]"))return vars.getOrDefault(e.charAt(0),0.0);
        if(e.equals("?"))return in.nextDouble();
        if(e.indexOf("|")!=-1){
            for(String a:e.split("\\|")){
                double i=expr(a,line);
                if(i!=0)return i;
            }
            return 0;
        }
        if(e.indexOf("&")!=-1){
            for(String a:e.split("&")){

                if(expr(a,line)==0)return 0;
            }
            return 1;
        }
        if(e.indexOf("+")!=-1){
            double i=0;
            for(String a:e.split("\\+")){
                i+=expr(a,line);
            }
            return i;
        }
        if(e.indexOf("-")>0){
            double i=0;
            String[]a=e.split("-");
            i=expr(a[0],line);
            for(int j=1;j<a.length;j++){
                i-=expr(a[j],line);
            }
            return i;
        }
        if(e.indexOf("*")>0){
            double i=1;
            for(String a:e.split("\\*")){
                i*=expr(a,line);
            }
            return i;
        }
        if(e.indexOf("/")>0){
            String[]a=e.split("/");
            double i=expr(a[0],line);
            for(int j=1;j<a.length;j++){
                i/=expr(a[j],line);
            }
            return i;
        }
        if(e.indexOf("%")>0){
            String[]a=e.split("%");
            double i=expr(a[0],line);
            for(int j=1;j<a.length;j++){
                double b=expr(a[j],line);
                i-=b*Math.floor(i/b);
            }
            return i;
        }
        if(e.startsWith("-"))return -expr(e.substring(1),line);
        if(e.startsWith("ln"))return log(expr(e.substring(2),line));
        if(e.startsWith("log"))return log10(expr(e.substring(3),line));
        if(e.startsWith("sin"))return sin(expr(e.substring(3),line));
        if(e.startsWith("cos"))return cos(expr(e.substring(3),line));
        if(e.startsWith("tan"))return tan(expr(e.substring(3),line));
        if(e.startsWith("sec"))return 1/cos(expr(e.substring(3),line));
        if(e.startsWith("csc"))return 1/sin(expr(e.substring(3),line));
        if(e.startsWith("cot"))return 1/tan(expr(e.substring(3),line));
        if(e.startsWith("abs"))return abs(expr(e.substring(3),line));
        if(e.startsWith("sqrt"))return sqrt(expr(e.substring(4),line));
        if(e.startsWith("cbrt"))return cbrt(expr(e.substring(4),line));
        if(e.startsWith("_"))return floor(expr(e.substring(1),line));
        if(e.startsWith("!"))return expr(e.substring(1),line)==0?1:0;
        throwError("Could not evaluate expression "+e+" on line "+line);
        }catch(Exception ex){
            throwError("Unexpected error on line "+line);
        }
        return 0;
    }
    static void throwError(String message){
        JOptionPane.showMessageDialog(null,message,"",JOptionPane.ERROR_MESSAGE);
        System.exit(0);
    }
    public static void main(String[]a){
        if(a.length==0)a=new String[]{"file"};
        List<String>line=new ArrayList<>();
        try{Scanner read=new Scanner(new File(a[0]+".mpp"));
        while(read.hasNext()){
            line.add(read.nextLine());
        }
        read.close();}catch(Exception ex){
            throwError("Could not read file.");
        }
        try{log=new PrintStream("log.txt");
        for(int i=0;i<line.size();i++){
            String l=line.get(i);
            String flag="out";
            if(l.indexOf(">")!=-1){
                String[]k=l.split(">");
                flag=k[1];
                l=k[0];
            }
            double q=expr(l,i+1);
            if(flag.equals("out")){
                System.out.println(q);
            }
            if(flag.equals("$")){
                if((int)q==0)System.exit(0);
                if((int)q>line.size()||(int)q<0)throwError("Attempt to go to nonexistent line "+(int)q+" from line "+(i+1));
                i=(int)(q-2);
            }
            if(flag.matches("[a-z]"))vars.put(flag.charAt(0),q);
            if(flag.matches("^\\{(.+)\\}$")){
                flag=flag.replaceAll("^\\{(.+)\\}$","$1");
                tape.put((int)expr(flag,i+1),q);
            }
        }}catch(Exception e){
            throwError("Unidentified error.");
        }
    }
}