diff options
| author | Yuchen Pei <me@ypei.me> | 2018-01-20 15:41:49 +0100 |
|---|---|---|
| committer | Yuchen Pei <me@ypei.me> | 2018-01-20 15:41:49 +0100 |
| commit | d3a0cc3a8ba6dfeb64d3faeffdeb6845b60e5840 (patch) | |
| tree | d58df9ec2480e2a9ec6240f9c797f83d1a0b1056 /projects/12/Keyboard.jack | |
| parent | 3571f998b28fbc8d9250ba04c983935f10a16c15 (diff) | |
rearranged the dir for github
- removed tools and pdfs
- rearranged the projects dirs
- added md files
- other minor changes
Diffstat (limited to 'projects/12/Keyboard.jack')
| -rw-r--r-- | projects/12/Keyboard.jack | 97 |
1 files changed, 0 insertions, 97 deletions
diff --git a/projects/12/Keyboard.jack b/projects/12/Keyboard.jack deleted file mode 100644 index a35704a..0000000 --- a/projects/12/Keyboard.jack +++ /dev/null @@ -1,97 +0,0 @@ -// 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() {
- return Memory.peek(24576);
- }
-
- /**
- * 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 int key, key1;
- let key = 0;
- while (key = 0) {
- let key = Memory.peek(24576);
- }
- let key1 = key;
- while (key1 = key) {
- let key1 = Memory.peek(24576);
- }
- if ((key > 31) & (key < 127) | (key = 128) | (key = 129)) {
- 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 int c;
- var String s;
- let s = String.new(140);
- do Output.printString(message);
- let c = Keyboard.readChar();
- while (~(c = 128)) {
- if (c = 129) {
- if (s.length() > 0) {
- do s.eraseLastChar();
- }
- } else {
- do s.appendChar(c);
- }
- let c = Keyboard.readChar();
- }
- return s;
- }
-
- /**
- * 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;
- do Output.printString(message);
- let s = Keyboard.readLine("");
- return s.intValue();
- }
-}
|