63 lines
1.8 KiB
Plaintext
63 lines
1.8 KiB
Plaintext
// This file is part of www.nand2tetris.org
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// and the book "The Elements of Computing Systems"
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// by Nisan and Schocken, MIT Press.
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// File name: projects/12/Keyboard.jack
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/**
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* A library for handling user input from the keyboard.
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*/
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class Keyboard {
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/** Initializes the keyboard. */
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function void init() {
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}
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/**
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* Returns the character of the currently pressed key on the keyboard;
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* if no key is currently pressed, returns 0.
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*
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* Recognizes all ASCII characters, as well as the following keys:
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* new line = 128 = String.newline()
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* backspace = 129 = String.backspace()
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* left arrow = 130
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* up arrow = 131
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* right arrow = 132
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* down arrow = 133
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* home = 134
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* End = 135
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* page up = 136
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* page down = 137
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* insert = 138
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* delete = 139
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* ESC = 140
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* F1 - F12 = 141 - 152
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*/
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function char keyPressed() {
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}
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/**
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* Waits until a key is pressed on the keyboard and released,
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* then echoes the key to the screen, and returns the character
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* of the pressed key.
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*/
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function char readChar() {
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}
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/**
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* Displays the message on the screen, reads from the keyboard the entered
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* text until a newline character is detected, echoes the text to the screen,
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* and returns its value. Also handles user backspaces.
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*/
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function String readLine(String message) {
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}
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/**
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* Displays the message on the screen, reads from the keyboard the entered
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* text until a newline character is detected, echoes the text to the screen,
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* and returns its integer value (until the first non-digit character in the
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* entered text is detected). Also handles user backspaces.
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*/
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function int readInt(String message) {
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}
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}
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