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Assembler.java
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Assembler.java
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import java.io.*;
import java.util.Scanner;
public class Assembler
{
public static void main(String args[]) // MAIN FUNCTION
{
try
{
Scanner in = new Scanner(System.in);
System.out.println("Enter the filename");
String filename = in.next();
File read = new File("H:\\Code\\"+ filename +".asm");
FileWriter write = new FileWriter("H:\\Code\\"+ filename + ".hack");
int linenumber = -1;
int i;
Scanner scan = new Scanner(read);
String line = "";
String trim = "";
String trailzero = "";
String Binval = "";
while(scan.hasNextLine())
{
line = scan.nextLine();
trim = line.replaceAll("\\s", "");
if(trim.indexOf("/") == 0) // COMMENTS
{
}
else if(trim.indexOf("@") == 0 && Character.isDigit(trim.charAt(1))) // A INSTRUCTION
{
String value = trim.substring(1,trim.length());
int decimal = Integer.parseInt(value);
String Binary = Integer.toBinaryString(decimal);
for(i=0;i<(16-Binary.length());i++)
{
trailzero = trailzero + "0";
}
String binvalue = trailzero + Binary + "\n"; // BINARY VALUE OF "A INSTRUCTION"
write.write(binvalue);
trailzero = "";
binvalue = "";
linenumber++;
}
else if(trim.contains("=") && !trim.contains("/")) // C INSTRUCTION 1
{
String[] parts = trim.split("=");
String part1 = parts[0];
String part2 = parts[1];
Binval = Cinstruction(part1, part2, "");
write.write(Binval);
linenumber++;
}
else if(trim.contains(";") && !trim.contains("/")) // C INSTRUCTION 2
{
String[] parts = trim.split(";");
String part1 = parts[0];
String part2 = parts[1];
Binval = Cinstruction("",part1,part2);
write.write(Binval);
linenumber++;
}
else if(trim.length() == 0) // EMPTY LINES
{
}
else
{
// PREDEFINDED SYMBOLS
if((trim.indexOf("@") == 0) && (trim.indexOf("R") == 1)) // CONVERTING TO BINARY OF PREDEFINED SYMBOLS: R0 TO R15
{
String value = trim.substring(2,trim.length());
int decimal = Integer.parseInt(value);
String Binary = Integer.toBinaryString(decimal);
for(i=0;i<(16-Binary.length());i++)
{
trailzero = trailzero + "0";
}
String binvalue = trailzero + Binary + "\n";
trailzero = "";
write.write(binvalue);
}
else if(trim.indexOf("@") == 0) // OTHER PREDEFINED SYMBOLS
{
String otherpredef = "";
String binvalue = "";
String exsym[][] =
{
{"SCREEN","0100000000000000"},
{"KBD","0110000000000000"},
{"SP","0000000000000000"},
{"LCL","0000000000000001"},
{"ARG","0000000000000010"},
{"THIS","0000000000000011"},
{"THAT","0000000000000100"},
};
for(i=0;i<exsym.length;i++)
{
if(trim.equals(exsym[i][0]))
{
otherpredef = exsym[i][1];
}
else
{
}
}
binvalue = otherpredef + "\n";
write.write(binvalue);
linenumber++;
}
else if(trim.indexOf("(") == 0 && trim.indexOf(")") == (trim.length()-1)) // LABEL SYMBOL
{
String Label = trim.substring(1,trim.length()-1);
int p = 1;
String[][] Labels = new String[100][100];
for(i = 0;i < p; i++)
{
Labels[i][0] = Label;
Labels[i][1] = Integer.toString(linenumber);
}
p++;
}
else
{
linenumber++;
}
}
}
write.close();
scan.close();
in.close();
//System.out.println("Number of Lines = "+linenumber);
System.out.println("Successfully created "+ filename + ".hack file");
}
catch (IOException e)
{
System.out.println("An error occurred.");
}
finally
{
}
}
public static String Cinstruction(String part1, String part2, String part3) // C INSTRUCTION FUNCTION
{
int i;
String a = "0";
String destination_part = part1;
String computing_part = part2;
String jump_part = part3;
String comp_part_bin = "";
String dest_part_bin = "";
String jump_part_bin = "";
String binaryvalue;
if(computing_part.contains("M")) // COMPUTATION IN MEMORY
{
a = "1";
}
String dest[][] = //DESTINATION PART
{
{"null","000"},
{"M","001"},
{"D","010"},
{"MD","011"},
{"A","100"},
{"AM","101"},
{"AD","110"},
{"AMD","111"},
};
String comp[][] = //COMPUTING PART
{
{"0","101010"},
{"1","111111"},
{"-1","111010"},
{"D","001100"},
{"A","110000"},
{"!D","001101"},
{"!A","110001"},
{"-D","001111"},
{"-A","110011"},
{"D+1","011111"},
{"A+1","110111"},
{"D-1","001110"},
{"A-1","110010"},
{"D-1","001110"},
{"A-1","110010"},
{"D+A","000010"},
{"D-A","010011"},
{"A-D","000111"},
{"D&A","000000"},
{"D|A","010101"},
{"M","110000"},
{"!M","110001"},
{"-M","110011"},
{"M+1","110111"},
{"M-1","110010"},
{"D+M","000010"},
{"D-M","010011"},
{"M-D","000111"},
{"D&M","000000"},
{"D|M","010101"},
};
String jump[][] = //JUMP PART
{
{"null","000"},
{"JGT","001"},
{"JEQ","010"},
{"JGE","011"},
{"JLT","100"},
{"JNE","101"},
{"JLE","110"},
{"JMP","111"},
};
for(i=0;i<comp.length;i++)
{
if(computing_part.equals(comp[i][0]))
{
comp_part_bin = comp[i][1];
}
}
for(i=0;i<dest.length;i++)
{
if(destination_part.equals(dest[i][0]))
{
dest_part_bin = dest[i][1];
}
}
for(i=0;i<jump.length;i++)
{
if(jump_part.equals(jump[i][0]))
{
jump_part_bin = jump[i][1];
}
}
if(jump_part == null || jump_part == "")
{
jump_part_bin = "000";
}
if(computing_part == null || computing_part == "0")
{
comp_part_bin = "101010";
}
if(destination_part == null || destination_part == "")
{
dest_part_bin = "000";
}
binaryvalue = "111"+ a + comp_part_bin + dest_part_bin + jump_part_bin + "\n";
a = "0";
destination_part = "";
computing_part = "";
jump_part = "";
comp_part_bin = "";
dest_part_bin = "";
jump_part_bin = "";
return binaryvalue; // RETURN BINARY VALUE OF C INSTRUCTION
}
public static String Symbols(String s) // SYMBOLS
{
// PREDEFINED SYMBOLS
int i;
String trailzero = "";
if((s.indexOf("@") == 0) && (s.indexOf("R") == 1)) // CONVERTING TO BINARY OF PREDEFINED SYMBOLS: R0 TO R15
{
String value = s.substring(2,s.length());
int decimal = Integer.parseInt(value);
String Binary = Integer.toBinaryString(decimal);
for(i=0;i<(16-Binary.length());i++)
{
trailzero = trailzero + "0";
}
String binvalue = trailzero + Binary + "\n";
trailzero = "";
return binvalue;
}
else // OTHER PREDEFINED SYMBOLS
{
String otherpredef = "";
String binvalue = "";
String exsym[][] =
{
{"SCREEN","0100000000000000"},
{"KBD","0110000000000000"},
{"SP","0000000000000000"},
{"LCL","0000000000000001"},
{"ARG","0000000000000010"},
{"THIS","0000000000000011"},
{"THAT","0000000000000100"},
};
for(i=0;i<exsym.length;i++)
{
if(s.equals(exsym[i][0]))
{
otherpredef = exsym[i][1];
}
}
binvalue = otherpredef + "\n";
return binvalue;
}
}
}