hackass/Code.java at main · made42/hackass · GitHub

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/**
 * This module provides services for translating symbolic Hack mnemonics into their binary codes. Specifically, it
 * translates symbolic Hack mnemonics into their binary codes according to the language specifications.
 *
 * @author Maarten Derks
 */
classCode {

/**
 * Returns the binary code of the dest mnemonic.
 *
 * @param field dest mnemonic
 * @return 3 bits, as a string
 */
staticStringdest(Stringfield) {
if (field != null) {
switch (field) {
case"M": return"001";
case"D": return"010";
case"MD": return"011";
case"A": return"100";
case"AM": return"101";
case"AD": return"110";
case"ADM": return"111";
default: returnnull;
 }
 } else {
return"000";
 }
 }

/**
 * Returns the binary code of the comp mnemonic.
 *
 * @param field comp mnemonic
 * @return 7 bits, as a string
 */
staticStringcomp(Stringfield) {
if (field != null) {
switch (field) {
case"0": return"0101010";
case"1": return"0111111";
case"-1": return"0111010";
case"D": return"0001100";
case"A": return"0110000";
case"!D": return"0001101";
case"!A": return"0110001";
case"D+1": return"0011111";
case"A+1": return"0110111";
case"D-1": return"0001110";
case"A-1": return"0110010";
case"D+A": return"0000010";
case"D-A": return"0010011";
case"A-D": return"0000111";
case"D&A": return"0000000";
case"D|A": return"0010101";
case"M": return"1110000";
case"!M": return"1110001";
case"M+1": return"1110111";
case"M-1": return"1110010";
case"D+M": return"1000010";
case"D-M": return"1010011";
case"M-D": return"1000111";
case"D&M": return"1000000";
case"D|M": return"1010101";
default: returnnull;
 }
 } else {
return"000";
 }
 }

/**
 * Returns the binary code of the jump mnemonic.
 *
 * @param field jump mnemonic
 * @return 3 bits, as a string
 */
staticStringjump(Stringfield) {
if (field != null) {
switch (field) {
case"JGT": return"001";
case"JEQ": return"010";
case"JGE": return"011";
case"JLT": return"100";
case"JNE": return"101";
case"JLE": return"110";
case"JMP": return"111";
default: return"000";
 }
 } else {
return"000";
 }
 }
}