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Code Pull Requests Releases Activity

Add solutions for part 1

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Felix Martin
2020-11-15 13:57:48 -05:00
parent e4f9fd2682
commit 742db6d102
479 changed files with 202980 additions and 13 deletions
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196
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// This file is part of www.nand2tetris.org
// and the book "The Elements of Computing Systems"
// by Nisan and Schocken, MIT Press.
// File name: projects/12/Keyboard.jack
/**
* A library for handling user input from the keyboard.
*/
class Keyboard {
/** Initializes the keyboard. */
function void init() {
return;
}
/**
* Returns the character of the currently pressed key on the keyboard;
* if no key is currently pressed, returns 0.
*
* Recognizes all ASCII characters, as well as the following keys:
* new line = 128 = String.newline()
* backspace = 129 = String.backspace()
* left arrow = 130
* up arrow = 131
* right arrow = 132
* down arrow = 133
* home = 134
* End = 135
* page up = 136
* page down = 137
* insert = 138
* delete = 139
* ESC = 140
* F1 - F12 = 141 - 152
*/
function char keyPressed() {
var char value;
let value = Memory.peek(24576);
if (value = 128) {
return String.newLine();
}
if (value = 129) {
return String.backSpace();
}
return value;
}
/**
* Waits until a key is pressed on the keyboard and released,
* then echoes the key to the screen, and returns the character
* of the pressed key.
*/
function char readChar() {
var char key, result;
while (Keyboard.keyPressed() = 0) {}
let key = Keyboard.keyPressed();
while (~(Keyboard.keyPressed() = 0)) {}
if (key = String.newLine()) {
return key;
}
if (key = String.backSpace()) {
return key;
}
do Output.printChar(key);
return key;
}
/**
* Displays the message on the screen, reads from the keyboard the entered
* text until a newline character is detected, echoes the text to the screen,
* and returns its value. Also handles user backspaces.
*/
function String readLine(String message) {
var String s;
var char key, newline, backspace;
var int i;
let newline = String.newLine();
let backspace = String.backSpace();
let s = String.new(128);
let key = 0;
do Output.printString(message);
let i = 0;
while (~(key = newline)) {
let key = Keyboard.readChar();
if (key = newline) {
do Output.println();
return s;
} else {
if (key = backspace) {
if (i > 0) {
do s.eraseLastChar();
do Output.backSpace();
let i = i - 1;
}
} else {
do s.appendChar(key);
let i = i + 1;
}
}
// Prevent out of bound error.
if (i = 128) {
return s;
}
}
return s;
}
function int textToInt(String s) {
var int result, i, length, multiplier;
var char c;
var boolean isNegative, continue;
let isNegative = false;
let length = s.length();
let i = 0;
let result = 0;
let multiplier = 1;
if (length = 0) {
return 0;
}
if (s.charAt(0) = 45) {
let isNegative = true;
}
let i = length;
while (true) {
let i = i - 1;
let c = s.charAt(i);
if ((s.charAt(i) > 47) & (s.charAt(i) < 58)) {
let result = result + ((s.charAt(i) - 48) * multiplier);
let multiplier = multiplier * 10;
} else {
// could raise exception here;
}
if (isNegative) {
if (i = 1) {
return -result;
}
} else {
if (i = 0) {
return result;
}
}
}
return 0;
}
/**
* Displays the message on the screen, reads from the keyboard the entered
* text until a newline character is detected, echoes the text to the screen,
* and returns its integer value (until the first non-digit character in the
* entered text is detected). Also handles user backspaces.
*/
function int readInt(String message) {
var String s;
var char key, newline, backspace;
var int i;
let newline = String.newLine();
let backspace = String.backSpace();
let s = String.new(128);
let key = 0;
do Output.printString(message);
let i = 0;
while (~(key = newline)) {
let key = Keyboard.readChar();
if (key = newline) {
do Output.println();
} else {
if (key = backspace) {
if (i > 0) {
do s.eraseLastChar();
do Output.backSpace();
let i = i - 1;
}
} else {
do s.appendChar(key);
let i = i + 1;
}
}
// Prevent out of bound error.
if (i = 128) {
return s;
}
}
let i = Keyboard.textToInt(s);
do s.dispose();
return i;
}
}

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// This file is part of www.nand2tetris.org
// and the book "The Elements of Computing Systems"
// by Nisan and Schocken, MIT Press.
// File name: projects/12/KeyboardTest/Main.jack
/** Test program for the OS Keyboard class. */
class Main {
/** Gets input from the user and verifies its contents. */
function void main() {
var char c, key;
var String s;
var int i;
var boolean ok;
let ok = false;
do Output.printString("keyPressed test:");
do Output.println();
while (~ok) {
do Output.printString("Please press the 'Page Down' key");
while (key = 0) {
let key = Keyboard.keyPressed();
}
let c = key;
while (~(key = 0)) {
let key = Keyboard.keyPressed();
}
do Output.println();
if (c = 137) {
do Output.printString("ok");
do Output.println();
let ok = true;
}
}
let ok = false;
do Output.printString("readChar test:");
do Output.println();
do Output.printString("(Verify that the pressed character is echoed to the screen)");
do Output.println();
while (~ok) {
do Output.printString("Please press the number '3': ");
let c = Keyboard.readChar();
do Output.println();
if (c = 51) {
do Output.printString("ok");
do Output.println();
let ok = true;
}
}
let ok = false;
do Output.printString("readLine test:");
do Output.println();
do Output.printString("(Verify echo and usage of 'backspace')");
do Output.println();
while (~ok) {
let s = Keyboard.readLine("Please type 'JACK' and press enter: ");
if (s.length() = 4) {
if ((s.charAt(0) = 74) & (s.charAt(1) = 65) & (s.charAt(2) = 67) & (s.charAt(3) = 75)) {
do Output.printString("ok");
do Output.println();
let ok = true;
}
}
}
let ok = false;
do Output.printString("readInt test:");
do Output.println();
do Output.printString("(Verify echo and usage of 'backspace')");
do Output.println();
while (~ok) {
let i = Keyboard.readInt("Please type '-32123' and press enter: ");
if (i = (-32123)) {
do Output.printString("ok");
do Output.println();
let ok = true;
}
}
do Output.println();
do Output.printString("Test completed successfully");
return;
}
}