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2025-11-09 14:14:30 -05:00
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38
10/ArrayTest/Main.jack Normal file
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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/10/ArrayTest/Main.jack
// (same as projects/9/Average/Main.jack)
/** Computes the average of a sequence of integers. */
class Main {
function void main() {
var Array a;
var int length;
var int i, sum;
let length = Keyboard.readInt("HOW MANY NUMBERS? ");
let a = Array.new(length);
let i = 0;
while (i < length) {
let a[i] = Keyboard.readInt("ENTER THE NEXT NUMBER: ");
let i = i + 1;
}
let i = 0;
let sum = 0;
while (i < length) {
let sum = sum + a[i];
let i = i + 1;
}
do Output.printString("THE AVERAGE IS: ");
do Output.printInt(sum / length);
do Output.println();
return;
}
}

286
10/ArrayTest/Main.xml Normal file
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<class>
<keyword> class </keyword>
<identifier> Main </identifier>
<symbol> { </symbol>
<subroutineDec>
<keyword> function </keyword>
<keyword> void </keyword>
<identifier> main </identifier>
<symbol> ( </symbol>
<parameterList>
</parameterList>
<symbol> ) </symbol>
<subroutineBody>
<symbol> { </symbol>
<varDec>
<keyword> var </keyword>
<identifier> Array </identifier>
<identifier> a </identifier>
<symbol> ; </symbol>
</varDec>
<varDec>
<keyword> var </keyword>
<keyword> int </keyword>
<identifier> length </identifier>
<symbol> ; </symbol>
</varDec>
<varDec>
<keyword> var </keyword>
<keyword> int </keyword>
<identifier> i </identifier>
<symbol> , </symbol>
<identifier> sum </identifier>
<symbol> ; </symbol>
</varDec>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> length </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> Keyboard </identifier>
<symbol> . </symbol>
<identifier> readInt </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<stringConstant> HOW MANY NUMBERS? </stringConstant>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<letStatement>
<keyword> let </keyword>
<identifier> a </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> Array </identifier>
<symbol> . </symbol>
<identifier> new </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> length </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<letStatement>
<keyword> let </keyword>
<identifier> i </identifier>
<symbol> = </symbol>
<expression>
<term>
<integerConstant> 0 </integerConstant>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<whileStatement>
<keyword> while </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> i </identifier>
</term>
<symbol> &lt; </symbol>
<term>
<identifier> length </identifier>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> a </identifier>
<symbol> [ </symbol>
<expression>
<term>
<identifier> i </identifier>
</term>
</expression>
<symbol> ] </symbol>
<symbol> = </symbol>
<expression>
<term>
<identifier> Keyboard </identifier>
<symbol> . </symbol>
<identifier> readInt </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<stringConstant> ENTER THE NEXT NUMBER: </stringConstant>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<letStatement>
<keyword> let </keyword>
<identifier> i </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> i </identifier>
</term>
<symbol> + </symbol>
<term>
<integerConstant> 1 </integerConstant>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
</statements>
<symbol> } </symbol>
</whileStatement>
<letStatement>
<keyword> let </keyword>
<identifier> i </identifier>
<symbol> = </symbol>
<expression>
<term>
<integerConstant> 0 </integerConstant>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<letStatement>
<keyword> let </keyword>
<identifier> sum </identifier>
<symbol> = </symbol>
<expression>
<term>
<integerConstant> 0 </integerConstant>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<whileStatement>
<keyword> while </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> i </identifier>
</term>
<symbol> &lt; </symbol>
<term>
<identifier> length </identifier>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> sum </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> sum </identifier>
</term>
<symbol> + </symbol>
<term>
<identifier> a </identifier>
<symbol> [ </symbol>
<expression>
<term>
<identifier> i </identifier>
</term>
</expression>
<symbol> ] </symbol>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<letStatement>
<keyword> let </keyword>
<identifier> i </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> i </identifier>
</term>
<symbol> + </symbol>
<term>
<integerConstant> 1 </integerConstant>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
</statements>
<symbol> } </symbol>
</whileStatement>
<doStatement>
<keyword> do </keyword>
<identifier> Output </identifier>
<symbol> . </symbol>
<identifier> printString </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<stringConstant> THE AVERAGE IS: </stringConstant>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<doStatement>
<keyword> do </keyword>
<identifier> Output </identifier>
<symbol> . </symbol>
<identifier> printInt </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> sum </identifier>
</term>
<symbol> / </symbol>
<term>
<identifier> length </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<doStatement>
<keyword> do </keyword>
<identifier> Output </identifier>
<symbol> . </symbol>
<identifier> println </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<returnStatement>
<keyword> return </keyword>
<symbol> ; </symbol>
</returnStatement>
</statements>
<symbol> } </symbol>
</subroutineBody>
</subroutineDec>
<symbol> } </symbol>
</class>

142
10/ArrayTest/MainT.xml Normal file
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<tokens>
<keyword> class </keyword>
<identifier> Main </identifier>
<symbol> { </symbol>
<keyword> function </keyword>
<keyword> void </keyword>
<identifier> main </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> var </keyword>
<identifier> Array </identifier>
<identifier> a </identifier>
<symbol> ; </symbol>
<keyword> var </keyword>
<keyword> int </keyword>
<identifier> length </identifier>
<symbol> ; </symbol>
<keyword> var </keyword>
<keyword> int </keyword>
<identifier> i </identifier>
<symbol> , </symbol>
<identifier> sum </identifier>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> length </identifier>
<symbol> = </symbol>
<identifier> Keyboard </identifier>
<symbol> . </symbol>
<identifier> readInt </identifier>
<symbol> ( </symbol>
<stringConstant> HOW MANY NUMBERS? </stringConstant>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> a </identifier>
<symbol> = </symbol>
<identifier> Array </identifier>
<symbol> . </symbol>
<identifier> new </identifier>
<symbol> ( </symbol>
<identifier> length </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> i </identifier>
<symbol> = </symbol>
<integerConstant> 0 </integerConstant>
<symbol> ; </symbol>
<keyword> while </keyword>
<symbol> ( </symbol>
<identifier> i </identifier>
<symbol> &lt; </symbol>
<identifier> length </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> let </keyword>
<identifier> a </identifier>
<symbol> [ </symbol>
<identifier> i </identifier>
<symbol> ] </symbol>
<symbol> = </symbol>
<identifier> Keyboard </identifier>
<symbol> . </symbol>
<identifier> readInt </identifier>
<symbol> ( </symbol>
<stringConstant> ENTER THE NEXT NUMBER: </stringConstant>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> i </identifier>
<symbol> = </symbol>
<identifier> i </identifier>
<symbol> + </symbol>
<integerConstant> 1 </integerConstant>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> let </keyword>
<identifier> i </identifier>
<symbol> = </symbol>
<integerConstant> 0 </integerConstant>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> sum </identifier>
<symbol> = </symbol>
<integerConstant> 0 </integerConstant>
<symbol> ; </symbol>
<keyword> while </keyword>
<symbol> ( </symbol>
<identifier> i </identifier>
<symbol> &lt; </symbol>
<identifier> length </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> let </keyword>
<identifier> sum </identifier>
<symbol> = </symbol>
<identifier> sum </identifier>
<symbol> + </symbol>
<identifier> a </identifier>
<symbol> [ </symbol>
<identifier> i </identifier>
<symbol> ] </symbol>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> i </identifier>
<symbol> = </symbol>
<identifier> i </identifier>
<symbol> + </symbol>
<integerConstant> 1 </integerConstant>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> do </keyword>
<identifier> Output </identifier>
<symbol> . </symbol>
<identifier> printString </identifier>
<symbol> ( </symbol>
<stringConstant> THE AVERAGE IS: </stringConstant>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Output </identifier>
<symbol> . </symbol>
<identifier> printInt </identifier>
<symbol> ( </symbol>
<identifier> sum </identifier>
<symbol> / </symbol>
<identifier> length </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Output </identifier>
<symbol> . </symbol>
<identifier> println </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<symbol> } </symbol>
</tokens>

28
10/ExpressionLessSquare/Main.jack Normal file
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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/10/ExpressionLessSquare/Main.jack
/** Expressionless version of projects/10/Square/Main.jack. */
class Main {
static boolean test; // Added for testing -- there is no static keyword
// in the Square files.
function void main() {
var SquareGame game;
let game = game;
do game.run();
do game.dispose();
return;
}
function void more() { // Added to test Jack syntax that is not used in
var boolean b; // the Square files.
if (b) {
}
else { // There is no else keyword in the Square files.
}
return;
}
}

114
10/ExpressionLessSquare/Main.xml Normal file
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<class>
<keyword> class </keyword>
<identifier> Main </identifier>
<symbol> { </symbol>
<classVarDec>
<keyword> static </keyword>
<keyword> boolean </keyword>
<identifier> test </identifier>
<symbol> ; </symbol>
</classVarDec>
<subroutineDec>
<keyword> function </keyword>
<keyword> void </keyword>
<identifier> main </identifier>
<symbol> ( </symbol>
<parameterList>
</parameterList>
<symbol> ) </symbol>
<subroutineBody>
<symbol> { </symbol>
<varDec>
<keyword> var </keyword>
<identifier> SquareGame </identifier>
<identifier> game </identifier>
<symbol> ; </symbol>
</varDec>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> game </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> game </identifier>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<doStatement>
<keyword> do </keyword>
<identifier> game </identifier>
<symbol> . </symbol>
<identifier> run </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<doStatement>
<keyword> do </keyword>
<identifier> game </identifier>
<symbol> . </symbol>
<identifier> dispose </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<returnStatement>
<keyword> return </keyword>
<symbol> ; </symbol>
</returnStatement>
</statements>
<symbol> } </symbol>
</subroutineBody>
</subroutineDec>
<subroutineDec>
<keyword> function </keyword>
<keyword> void </keyword>
<identifier> more </identifier>
<symbol> ( </symbol>
<parameterList>
</parameterList>
<symbol> ) </symbol>
<subroutineBody>
<symbol> { </symbol>
<varDec>
<keyword> var </keyword>
<keyword> boolean </keyword>
<identifier> b </identifier>
<symbol> ; </symbol>
</varDec>
<statements>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> b </identifier>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
</statements>
<symbol> } </symbol>
<keyword> else </keyword>
<symbol> { </symbol>
<statements>
</statements>
<symbol> } </symbol>
</ifStatement>
<returnStatement>
<keyword> return </keyword>
<symbol> ; </symbol>
</returnStatement>
</statements>
<symbol> } </symbol>
</subroutineBody>
</subroutineDec>
<symbol> } </symbol>
</class>

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<tokens>
<keyword> class </keyword>
<identifier> Main </identifier>
<symbol> { </symbol>
<keyword> static </keyword>
<keyword> boolean </keyword>
<identifier> test </identifier>
<symbol> ; </symbol>
<keyword> function </keyword>
<keyword> void </keyword>
<identifier> main </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> var </keyword>
<identifier> SquareGame </identifier>
<identifier> game </identifier>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> game </identifier>
<symbol> = </symbol>
<identifier> game </identifier>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> game </identifier>
<symbol> . </symbol>
<identifier> run </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> game </identifier>
<symbol> . </symbol>
<identifier> dispose </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> function </keyword>
<keyword> void </keyword>
<identifier> more </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> var </keyword>
<keyword> boolean </keyword>
<identifier> b </identifier>
<symbol> ; </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> b </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<symbol> } </symbol>
<keyword> else </keyword>
<symbol> { </symbol>
<symbol> } </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<symbol> } </symbol>
</tokens>

99
10/ExpressionLessSquare/Square.jack Normal file
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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/10/ExpressionLessSquare/Square.jack
/** Expressionless version of projects/10/Square/Square.jack. */
class Square {
field int x, y;
field int size;
constructor Square new(int Ax, int Ay, int Asize) {
let x = Ax;
let y = Ay;
let size = Asize;
do draw();
return x;
}
method void dispose() {
do Memory.deAlloc(this);
return;
}
method void draw() {
do Screen.setColor(x);
do Screen.drawRectangle(x, y, x, y);
return;
}
method void erase() {
do Screen.setColor(x);
do Screen.drawRectangle(x, y, x, y);
return;
}
method void incSize() {
if (x) {
do erase();
let size = size;
do draw();
}
return;
}
method void decSize() {
if (size) {
do erase();
let size = size;
do draw();
}
return;
}
method void moveUp() {
if (y) {
do Screen.setColor(x);
do Screen.drawRectangle(x, y, x, y);
let y = y;
do Screen.setColor(x);
do Screen.drawRectangle(x, y, x, y);
}
return;
}
method void moveDown() {
if (y) {
do Screen.setColor(x);
do Screen.drawRectangle(x, y, x, y);
let y = y;
do Screen.setColor(x);
do Screen.drawRectangle(x, y, x, y);
}
return;
}
method void moveLeft() {
if (x) {
do Screen.setColor(x);
do Screen.drawRectangle(x, y, x, y);
let x = x;
do Screen.setColor(x);
do Screen.drawRectangle(x, y, x, y);
}
return;
}
method void moveRight() {
if (x) {
do Screen.setColor(x);
do Screen.drawRectangle(x, y, x, y);
let x = x;
do Screen.setColor(x);
do Screen.drawRectangle(x, y, x, y);
}
return;
}
}

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<class>
<keyword> class </keyword>
<identifier> Square </identifier>
<symbol> { </symbol>
<classVarDec>
<keyword> field </keyword>
<keyword> int </keyword>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> ; </symbol>
</classVarDec>
<classVarDec>
<keyword> field </keyword>
<keyword> int </keyword>
<identifier> size </identifier>
<symbol> ; </symbol>
</classVarDec>
<subroutineDec>
<keyword> constructor </keyword>
<identifier> Square </identifier>
<identifier> new </identifier>
<symbol> ( </symbol>
<parameterList>
<keyword> int </keyword>
<identifier> Ax </identifier>
<symbol> , </symbol>
<keyword> int </keyword>
<identifier> Ay </identifier>
<symbol> , </symbol>
<keyword> int </keyword>
<identifier> Asize </identifier>
</parameterList>
<symbol> ) </symbol>
<subroutineBody>
<symbol> { </symbol>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> x </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> Ax </identifier>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<letStatement>
<keyword> let </keyword>
<identifier> y </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> Ay </identifier>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<letStatement>
<keyword> let </keyword>
<identifier> size </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> Asize </identifier>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<doStatement>
<keyword> do </keyword>
<identifier> draw </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<returnStatement>
<keyword> return </keyword>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> ; </symbol>
</returnStatement>
</statements>
<symbol> } </symbol>
</subroutineBody>
</subroutineDec>
<subroutineDec>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> dispose </identifier>
<symbol> ( </symbol>
<parameterList>
</parameterList>
<symbol> ) </symbol>
<subroutineBody>
<symbol> { </symbol>
<statements>
<doStatement>
<keyword> do </keyword>
<identifier> Memory </identifier>
<symbol> . </symbol>
<identifier> deAlloc </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<keyword> this </keyword>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<returnStatement>
<keyword> return </keyword>
<symbol> ; </symbol>
</returnStatement>
</statements>
<symbol> } </symbol>
</subroutineBody>
</subroutineDec>
<subroutineDec>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> draw </identifier>
<symbol> ( </symbol>
<parameterList>
</parameterList>
<symbol> ) </symbol>
<subroutineBody>
<symbol> { </symbol>
<statements>
<doStatement>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<doStatement>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<returnStatement>
<keyword> return </keyword>
<symbol> ; </symbol>
</returnStatement>
</statements>
<symbol> } </symbol>
</subroutineBody>
</subroutineDec>
<subroutineDec>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> erase </identifier>
<symbol> ( </symbol>
<parameterList>
</parameterList>
<symbol> ) </symbol>
<subroutineBody>
<symbol> { </symbol>
<statements>
<doStatement>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<doStatement>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<returnStatement>
<keyword> return </keyword>
<symbol> ; </symbol>
</returnStatement>
</statements>
<symbol> } </symbol>
</subroutineBody>
</subroutineDec>
<subroutineDec>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> incSize </identifier>
<symbol> ( </symbol>
<parameterList>
</parameterList>
<symbol> ) </symbol>
<subroutineBody>
<symbol> { </symbol>
<statements>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<doStatement>
<keyword> do </keyword>
<identifier> erase </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<letStatement>
<keyword> let </keyword>
<identifier> size </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> size </identifier>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<doStatement>
<keyword> do </keyword>
<identifier> draw </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<returnStatement>
<keyword> return </keyword>
<symbol> ; </symbol>
</returnStatement>
</statements>
<symbol> } </symbol>
</subroutineBody>
</subroutineDec>
<subroutineDec>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> decSize </identifier>
<symbol> ( </symbol>
<parameterList>
</parameterList>
<symbol> ) </symbol>
<subroutineBody>
<symbol> { </symbol>
<statements>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> size </identifier>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<doStatement>
<keyword> do </keyword>
<identifier> erase </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<letStatement>
<keyword> let </keyword>
<identifier> size </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> size </identifier>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<doStatement>
<keyword> do </keyword>
<identifier> draw </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<returnStatement>
<keyword> return </keyword>
<symbol> ; </symbol>
</returnStatement>
</statements>
<symbol> } </symbol>
</subroutineBody>
</subroutineDec>
<subroutineDec>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> moveUp </identifier>
<symbol> ( </symbol>
<parameterList>
</parameterList>
<symbol> ) </symbol>
<subroutineBody>
<symbol> { </symbol>
<statements>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<doStatement>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<doStatement>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<letStatement>
<keyword> let </keyword>
<identifier> y </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<doStatement>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<doStatement>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<returnStatement>
<keyword> return </keyword>
<symbol> ; </symbol>
</returnStatement>
</statements>
<symbol> } </symbol>
</subroutineBody>
</subroutineDec>
<subroutineDec>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> moveDown </identifier>
<symbol> ( </symbol>
<parameterList>
</parameterList>
<symbol> ) </symbol>
<subroutineBody>
<symbol> { </symbol>
<statements>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<doStatement>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<doStatement>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<letStatement>
<keyword> let </keyword>
<identifier> y </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<doStatement>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<doStatement>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<returnStatement>
<keyword> return </keyword>
<symbol> ; </symbol>
</returnStatement>
</statements>
<symbol> } </symbol>
</subroutineBody>
</subroutineDec>
<subroutineDec>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> moveLeft </identifier>
<symbol> ( </symbol>
<parameterList>
</parameterList>
<symbol> ) </symbol>
<subroutineBody>
<symbol> { </symbol>
<statements>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<doStatement>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<doStatement>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<letStatement>
<keyword> let </keyword>
<identifier> x </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<doStatement>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<doStatement>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<returnStatement>
<keyword> return </keyword>
<symbol> ; </symbol>
</returnStatement>
</statements>
<symbol> } </symbol>
</subroutineBody>
</subroutineDec>
<subroutineDec>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> moveRight </identifier>
<symbol> ( </symbol>
<parameterList>
</parameterList>
<symbol> ) </symbol>
<subroutineBody>
<symbol> { </symbol>
<statements>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<doStatement>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<doStatement>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<letStatement>
<keyword> let </keyword>
<identifier> x </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<doStatement>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<doStatement>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> x </identifier>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<identifier> y </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<returnStatement>
<keyword> return </keyword>
<symbol> ; </symbol>
</returnStatement>
</statements>
<symbol> } </symbol>
</subroutineBody>
</subroutineDec>
<symbol> } </symbol>
</class>

60
10/ExpressionLessSquare/SquareGame.jack Normal file
View File

@@ -0,0 +1,60 @@
// 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/10/ExpressionLessSquare/SquareGame.jack
/** Expressionless version of projects/10/Square/SquareGame.jack. */
class SquareGame {
field Square square;
field int direction;
constructor SquareGame new() {
let square = square;
let direction = direction;
return square;
}
method void dispose() {
do square.dispose();
do Memory.deAlloc(square);
return;
}
method void moveSquare() {
if (direction) { do square.moveUp(); }
if (direction) { do square.moveDown(); }
if (direction) { do square.moveLeft(); }
if (direction) { do square.moveRight(); }
do Sys.wait(direction);
return;
}
method void run() {
var char key;
var boolean exit;
let exit = key;
while (exit) {
while (key) {
let key = key;
do moveSquare();
}
if (key) { let exit = exit; }
if (key) { do square.decSize(); }
if (key) { do square.incSize(); }
if (key) { let direction = exit; }
if (key) { let direction = key; }
if (key) { let direction = square; }
if (key) { let direction = direction; }
while (key) {
let key = key;
do moveSquare();
}
}
return;
}
}

544
10/ExpressionLessSquare/SquareGame.xml Normal file
View File

@@ -0,0 +1,544 @@
<class>
<keyword> class </keyword>
<identifier> SquareGame </identifier>
<symbol> { </symbol>
<classVarDec>
<keyword> field </keyword>
<identifier> Square </identifier>
<identifier> square </identifier>
<symbol> ; </symbol>
</classVarDec>
<classVarDec>
<keyword> field </keyword>
<keyword> int </keyword>
<identifier> direction </identifier>
<symbol> ; </symbol>
</classVarDec>
<subroutineDec>
<keyword> constructor </keyword>
<identifier> SquareGame </identifier>
<identifier> new </identifier>
<symbol> ( </symbol>
<parameterList>
</parameterList>
<symbol> ) </symbol>
<subroutineBody>
<symbol> { </symbol>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> square </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> square </identifier>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<letStatement>
<keyword> let </keyword>
<identifier> direction </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> direction </identifier>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<returnStatement>
<keyword> return </keyword>
<expression>
<term>
<identifier> square </identifier>
</term>
</expression>
<symbol> ; </symbol>
</returnStatement>
</statements>
<symbol> } </symbol>
</subroutineBody>
</subroutineDec>
<subroutineDec>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> dispose </identifier>
<symbol> ( </symbol>
<parameterList>
</parameterList>
<symbol> ) </symbol>
<subroutineBody>
<symbol> { </symbol>
<statements>
<doStatement>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> dispose </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<doStatement>
<keyword> do </keyword>
<identifier> Memory </identifier>
<symbol> . </symbol>
<identifier> deAlloc </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> square </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<returnStatement>
<keyword> return </keyword>
<symbol> ; </symbol>
</returnStatement>
</statements>
<symbol> } </symbol>
</subroutineBody>
</subroutineDec>
<subroutineDec>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> moveSquare </identifier>
<symbol> ( </symbol>
<parameterList>
</parameterList>
<symbol> ) </symbol>
<subroutineBody>
<symbol> { </symbol>
<statements>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> direction </identifier>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<doStatement>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> moveUp </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> direction </identifier>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<doStatement>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> moveDown </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> direction </identifier>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<doStatement>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> moveLeft </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> direction </identifier>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<doStatement>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> moveRight </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<doStatement>
<keyword> do </keyword>
<identifier> Sys </identifier>
<symbol> . </symbol>
<identifier> wait </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<identifier> direction </identifier>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<returnStatement>
<keyword> return </keyword>
<symbol> ; </symbol>
</returnStatement>
</statements>
<symbol> } </symbol>
</subroutineBody>
</subroutineDec>
<subroutineDec>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> run </identifier>
<symbol> ( </symbol>
<parameterList>
</parameterList>
<symbol> ) </symbol>
<subroutineBody>
<symbol> { </symbol>
<varDec>
<keyword> var </keyword>
<keyword> char </keyword>
<identifier> key </identifier>
<symbol> ; </symbol>
</varDec>
<varDec>
<keyword> var </keyword>
<keyword> boolean </keyword>
<identifier> exit </identifier>
<symbol> ; </symbol>
</varDec>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> exit </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> key </identifier>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<whileStatement>
<keyword> while </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> exit </identifier>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<whileStatement>
<keyword> while </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> key </identifier>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> key </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> key </identifier>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<doStatement>
<keyword> do </keyword>
<identifier> moveSquare </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
</statements>
<symbol> } </symbol>
</whileStatement>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> key </identifier>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> exit </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> exit </identifier>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> key </identifier>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<doStatement>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> decSize </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> key </identifier>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<doStatement>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> incSize </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> key </identifier>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> direction </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> exit </identifier>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> key </identifier>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> direction </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> key </identifier>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> key </identifier>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> direction </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> square </identifier>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> key </identifier>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> direction </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> direction </identifier>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<whileStatement>
<keyword> while </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> key </identifier>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> key </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> key </identifier>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<doStatement>
<keyword> do </keyword>
<identifier> moveSquare </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
</statements>
<symbol> } </symbol>
</whileStatement>
</statements>
<symbol> } </symbol>
</whileStatement>
<returnStatement>
<keyword> return </keyword>
<symbol> ; </symbol>
</returnStatement>
</statements>
<symbol> } </symbol>
</subroutineBody>
</subroutineDec>
<symbol> } </symbol>
</class>

268
10/ExpressionLessSquare/SquareGameT.xml Normal file
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@@ -0,0 +1,268 @@
<tokens>
<keyword> class </keyword>
<identifier> SquareGame </identifier>
<symbol> { </symbol>
<keyword> field </keyword>
<identifier> Square </identifier>
<identifier> square </identifier>
<symbol> ; </symbol>
<keyword> field </keyword>
<keyword> int </keyword>
<identifier> direction </identifier>
<symbol> ; </symbol>
<keyword> constructor </keyword>
<identifier> SquareGame </identifier>
<identifier> new </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> let </keyword>
<identifier> square </identifier>
<symbol> = </symbol>
<identifier> square </identifier>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> direction </identifier>
<symbol> = </symbol>
<identifier> direction </identifier>
<symbol> ; </symbol>
<keyword> return </keyword>
<identifier> square </identifier>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> dispose </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> dispose </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Memory </identifier>
<symbol> . </symbol>
<identifier> deAlloc </identifier>
<symbol> ( </symbol>
<identifier> square </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> moveSquare </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> direction </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> moveUp </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> direction </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> moveDown </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> direction </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> moveLeft </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> direction </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> moveRight </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> do </keyword>
<identifier> Sys </identifier>
<symbol> . </symbol>
<identifier> wait </identifier>
<symbol> ( </symbol>
<identifier> direction </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> run </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> var </keyword>
<keyword> char </keyword>
<identifier> key </identifier>
<symbol> ; </symbol>
<keyword> var </keyword>
<keyword> boolean </keyword>
<identifier> exit </identifier>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> exit </identifier>
<symbol> = </symbol>
<identifier> key </identifier>
<symbol> ; </symbol>
<keyword> while </keyword>
<symbol> ( </symbol>
<identifier> exit </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> while </keyword>
<symbol> ( </symbol>
<identifier> key </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> let </keyword>
<identifier> key </identifier>
<symbol> = </symbol>
<identifier> key </identifier>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> moveSquare </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> key </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> let </keyword>
<identifier> exit </identifier>
<symbol> = </symbol>
<identifier> exit </identifier>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> key </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> decSize </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> key </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> incSize </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> key </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> let </keyword>
<identifier> direction </identifier>
<symbol> = </symbol>
<identifier> exit </identifier>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> key </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> let </keyword>
<identifier> direction </identifier>
<symbol> = </symbol>
<identifier> key </identifier>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> key </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> let </keyword>
<identifier> direction </identifier>
<symbol> = </symbol>
<identifier> square </identifier>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> key </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> let </keyword>
<identifier> direction </identifier>
<symbol> = </symbol>
<identifier> direction </identifier>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> while </keyword>
<symbol> ( </symbol>
<identifier> key </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> let </keyword>
<identifier> key </identifier>
<symbol> = </symbol>
<identifier> key </identifier>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> moveSquare </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<symbol> } </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<symbol> } </symbol>
</tokens>

449
10/ExpressionLessSquare/SquareT.xml Normal file
View File

@@ -0,0 +1,449 @@
<tokens>
<keyword> class </keyword>
<identifier> Square </identifier>
<symbol> { </symbol>
<keyword> field </keyword>
<keyword> int </keyword>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> ; </symbol>
<keyword> field </keyword>
<keyword> int </keyword>
<identifier> size </identifier>
<symbol> ; </symbol>
<keyword> constructor </keyword>
<identifier> Square </identifier>
<identifier> new </identifier>
<symbol> ( </symbol>
<keyword> int </keyword>
<identifier> Ax </identifier>
<symbol> , </symbol>
<keyword> int </keyword>
<identifier> Ay </identifier>
<symbol> , </symbol>
<keyword> int </keyword>
<identifier> Asize </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> let </keyword>
<identifier> x </identifier>
<symbol> = </symbol>
<identifier> Ax </identifier>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> y </identifier>
<symbol> = </symbol>
<identifier> Ay </identifier>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> size </identifier>
<symbol> = </symbol>
<identifier> Asize </identifier>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> draw </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> return </keyword>
<identifier> x </identifier>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> dispose </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> Memory </identifier>
<symbol> . </symbol>
<identifier> deAlloc </identifier>
<symbol> ( </symbol>
<keyword> this </keyword>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> draw </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> , </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> erase </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> , </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> incSize </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> erase </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> size </identifier>
<symbol> = </symbol>
<identifier> size </identifier>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> draw </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> decSize </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> size </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> erase </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> size </identifier>
<symbol> = </symbol>
<identifier> size </identifier>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> draw </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> moveUp </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> y </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> , </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> y </identifier>
<symbol> = </symbol>
<identifier> y </identifier>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> , </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> moveDown </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> y </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> , </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> y </identifier>
<symbol> = </symbol>
<identifier> y </identifier>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> , </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> moveLeft </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> , </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> x </identifier>
<symbol> = </symbol>
<identifier> x </identifier>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> , </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> moveRight </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> , </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> x </identifier>
<symbol> = </symbol>
<identifier> x </identifier>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> , </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<symbol> } </symbol>
</tokens>

36
10/Square/Main.jack Normal file
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@@ -0,0 +1,36 @@
// 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/10/Square/Main.jack
// (similar to projects/9/Square/Main.jack, with testing additions)
/** Initializes a new Square game and starts running it. */
class Main {
static boolean test; // Added for testing -- there is no static keyword
// in the Square files.
function void main() {
var SquareGame game;
let game = SquareGame.new();
do game.run();
do game.dispose();
return;
}
function void more() { // Added to test Jack syntax that is not used in
var int i, j; // the Square files.
var String s;
var Array a;
if (false) {
let s = "string constant";
let s = null;
let a[1] = a[2];
}
else { // There is no else keyword in the Square files.
let i = i * (-j);
let j = j / (-2); // note: unary negate constant 2
let i = i | j;
}
return;
}
}

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<class>
<keyword> class </keyword>
<identifier> Main </identifier>
<symbol> { </symbol>
<classVarDec>
<keyword> static </keyword>
<keyword> boolean </keyword>
<identifier> test </identifier>
<symbol> ; </symbol>
</classVarDec>
<subroutineDec>
<keyword> function </keyword>
<keyword> void </keyword>
<identifier> main </identifier>
<symbol> ( </symbol>
<parameterList>
</parameterList>
<symbol> ) </symbol>
<subroutineBody>
<symbol> { </symbol>
<varDec>
<keyword> var </keyword>
<identifier> SquareGame </identifier>
<identifier> game </identifier>
<symbol> ; </symbol>
</varDec>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> game </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> SquareGame </identifier>
<symbol> . </symbol>
<identifier> new </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<doStatement>
<keyword> do </keyword>
<identifier> game </identifier>
<symbol> . </symbol>
<identifier> run </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<doStatement>
<keyword> do </keyword>
<identifier> game </identifier>
<symbol> . </symbol>
<identifier> dispose </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<returnStatement>
<keyword> return </keyword>
<symbol> ; </symbol>
</returnStatement>
</statements>
<symbol> } </symbol>
</subroutineBody>
</subroutineDec>
<subroutineDec>
<keyword> function </keyword>
<keyword> void </keyword>
<identifier> more </identifier>
<symbol> ( </symbol>
<parameterList>
</parameterList>
<symbol> ) </symbol>
<subroutineBody>
<symbol> { </symbol>
<varDec>
<keyword> var </keyword>
<keyword> int </keyword>
<identifier> i </identifier>
<symbol> , </symbol>
<identifier> j </identifier>
<symbol> ; </symbol>
</varDec>
<varDec>
<keyword> var </keyword>
<identifier> String </identifier>
<identifier> s </identifier>
<symbol> ; </symbol>
</varDec>
<varDec>
<keyword> var </keyword>
<identifier> Array </identifier>
<identifier> a </identifier>
<symbol> ; </symbol>
</varDec>
<statements>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<keyword> false </keyword>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> s </identifier>
<symbol> = </symbol>
<expression>
<term>
<stringConstant> string constant </stringConstant>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<letStatement>
<keyword> let </keyword>
<identifier> s </identifier>
<symbol> = </symbol>
<expression>
<term>
<keyword> null </keyword>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<letStatement>
<keyword> let </keyword>
<identifier> a </identifier>
<symbol> [ </symbol>
<expression>
<term>
<integerConstant> 1 </integerConstant>
</term>
</expression>
<symbol> ] </symbol>
<symbol> = </symbol>
<expression>
<term>
<identifier> a </identifier>
<symbol> [ </symbol>
<expression>
<term>
<integerConstant> 2 </integerConstant>
</term>
</expression>
<symbol> ] </symbol>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
</statements>
<symbol> } </symbol>
<keyword> else </keyword>
<symbol> { </symbol>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> i </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> i </identifier>
</term>
<symbol> * </symbol>
<term>
<symbol> ( </symbol>
<expression>
<term>
<symbol> - </symbol>
<term>
<identifier> j </identifier>
</term>
</term>
</expression>
<symbol> ) </symbol>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<letStatement>
<keyword> let </keyword>
<identifier> j </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> j </identifier>
</term>
<symbol> / </symbol>
<term>
<symbol> ( </symbol>
<expression>
<term>
<symbol> - </symbol>
<term>
<integerConstant> 2 </integerConstant>
</term>
</term>
</expression>
<symbol> ) </symbol>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<letStatement>
<keyword> let </keyword>
<identifier> i </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> i </identifier>
</term>
<symbol> | </symbol>
<term>
<identifier> j </identifier>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<returnStatement>
<keyword> return </keyword>
<symbol> ; </symbol>
</returnStatement>
</statements>
<symbol> } </symbol>
</subroutineBody>
</subroutineDec>
<symbol> } </symbol>
</class>

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<tokens>
<keyword> class </keyword>
<identifier> Main </identifier>
<symbol> { </symbol>
<keyword> static </keyword>
<keyword> boolean </keyword>
<identifier> test </identifier>
<symbol> ; </symbol>
<keyword> function </keyword>
<keyword> void </keyword>
<identifier> main </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> var </keyword>
<identifier> SquareGame </identifier>
<identifier> game </identifier>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> game </identifier>
<symbol> = </symbol>
<identifier> SquareGame </identifier>
<symbol> . </symbol>
<identifier> new </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> game </identifier>
<symbol> . </symbol>
<identifier> run </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> game </identifier>
<symbol> . </symbol>
<identifier> dispose </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> function </keyword>
<keyword> void </keyword>
<identifier> more </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> var </keyword>
<keyword> int </keyword>
<identifier> i </identifier>
<symbol> , </symbol>
<identifier> j </identifier>
<symbol> ; </symbol>
<keyword> var </keyword>
<identifier> String </identifier>
<identifier> s </identifier>
<symbol> ; </symbol>
<keyword> var </keyword>
<identifier> Array </identifier>
<identifier> a </identifier>
<symbol> ; </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<keyword> false </keyword>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> let </keyword>
<identifier> s </identifier>
<symbol> = </symbol>
<stringConstant> string constant </stringConstant>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> s </identifier>
<symbol> = </symbol>
<keyword> null </keyword>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> a </identifier>
<symbol> [ </symbol>
<integerConstant> 1 </integerConstant>
<symbol> ] </symbol>
<symbol> = </symbol>
<identifier> a </identifier>
<symbol> [ </symbol>
<integerConstant> 2 </integerConstant>
<symbol> ] </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> else </keyword>
<symbol> { </symbol>
<keyword> let </keyword>
<identifier> i </identifier>
<symbol> = </symbol>
<identifier> i </identifier>
<symbol> * </symbol>
<symbol> ( </symbol>
<symbol> - </symbol>
<identifier> j </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> j </identifier>
<symbol> = </symbol>
<identifier> j </identifier>
<symbol> / </symbol>
<symbol> ( </symbol>
<symbol> - </symbol>
<integerConstant> 2 </integerConstant>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> i </identifier>
<symbol> = </symbol>
<identifier> i </identifier>
<symbol> | </symbol>
<identifier> j </identifier>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<symbol> } </symbol>
</tokens>

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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/10/Square/Square.jack
// (same as projects/9/Square/Square.jack)
/** Implements a graphical square. */
class Square {
field int x, y; // screen location of the square's top-left corner
field int size; // length of this square, in pixels
/** Constructs a new square with a given location and size. */
constructor Square new(int Ax, int Ay, int Asize) {
let x = Ax;
let y = Ay;
let size = Asize;
do draw();
return this;
}
/** Disposes this square. */
method void dispose() {
do Memory.deAlloc(this);
return;
}
/** Draws the square on the screen. */
method void draw() {
do Screen.setColor(true);
do Screen.drawRectangle(x, y, x + size, y + size);
return;
}
/** Erases the square from the screen. */
method void erase() {
do Screen.setColor(false);
do Screen.drawRectangle(x, y, x + size, y + size);
return;
}
/** Increments the square size by 2 pixels. */
method void incSize() {
if (((y + size) < 254) & ((x + size) < 510)) {
do erase();
let size = size + 2;
do draw();
}
return;
}
/** Decrements the square size by 2 pixels. */
method void decSize() {
if (size > 2) {
do erase();
let size = size - 2;
do draw();
}
return;
}
/** Moves the square up by 2 pixels. */
method void moveUp() {
if (y > 1) {
do Screen.setColor(false);
do Screen.drawRectangle(x, (y + size) - 1, x + size, y + size);
let y = y - 2;
do Screen.setColor(true);
do Screen.drawRectangle(x, y, x + size, y + 1);
}
return;
}
/** Moves the square down by 2 pixels. */
method void moveDown() {
if ((y + size) < 254) {
do Screen.setColor(false);
do Screen.drawRectangle(x, y, x + size, y + 1);
let y = y + 2;
do Screen.setColor(true);
do Screen.drawRectangle(x, (y + size) - 1, x + size, y + size);
}
return;
}
/** Moves the square left by 2 pixels. */
method void moveLeft() {
if (x > 1) {
do Screen.setColor(false);
do Screen.drawRectangle((x + size) - 1, y, x + size, y + size);
let x = x - 2;
do Screen.setColor(true);
do Screen.drawRectangle(x, y, x + 1, y + size);
}
return;
}
/** Moves the square right by 2 pixels. */
method void moveRight() {
if ((x + size) < 510) {
do Screen.setColor(false);
do Screen.drawRectangle(x, y, x + 1, y + size);
let x = x + 2;
do Screen.setColor(true);
do Screen.drawRectangle((x + size) - 1, y, x + size, y + size);
}
return;
}
}

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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/10/Square/SquareGame.jack
// (same as projects/9/Square/SquareGame.jack)
/**
* Implements the Square game.
* This simple game allows the user to move a black square around
* the screen, and change the square's size during the movement.
* When the game starts, a square of 30 by 30 pixels is shown at the
* top-left corner of the screen. The user controls the square as follows.
* The 4 arrow keys are used to move the square up, down, left, and right.
* The 'z' and 'x' keys are used, respectively, to decrement and increment
* the square's size. The 'q' key is used to quit the game.
*/
class SquareGame {
field Square square; // the square of this game
field int direction; // the square's current direction:
// 0=none, 1=up, 2=down, 3=left, 4=right
/** Constructs a new Square Game. */
constructor SquareGame new() {
// Creates a 30 by 30 pixels square and positions it at the top-left
// of the screen.
let square = Square.new(0, 0, 30);
let direction = 0; // initial state is no movement
return this;
}
/** Disposes this game. */
method void dispose() {
do square.dispose();
do Memory.deAlloc(this);
return;
}
/** Moves the square in the current direction. */
method void moveSquare() {
if (direction = 1) { do square.moveUp(); }
if (direction = 2) { do square.moveDown(); }
if (direction = 3) { do square.moveLeft(); }
if (direction = 4) { do square.moveRight(); }
do Sys.wait(5); // delays the next movement
return;
}
/** Runs the game: handles the user's inputs and moves the square accordingly */
method void run() {
var char key; // the key currently pressed by the user
var boolean exit;
let exit = false;
while (~exit) {
// waits for a key to be pressed
while (key = 0) {
let key = Keyboard.keyPressed();
do moveSquare();
}
if (key = 81) { let exit = true; } // q key
if (key = 90) { do square.decSize(); } // z key
if (key = 88) { do square.incSize(); } // x key
if (key = 131) { let direction = 1; } // up arrow
if (key = 133) { let direction = 2; } // down arrow
if (key = 130) { let direction = 3; } // left arrow
if (key = 132) { let direction = 4; } // right arrow
// waits for the key to be released
while (~(key = 0)) {
let key = Keyboard.keyPressed();
do moveSquare();
}
} // while
return;
}
}

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10/Square/SquareGame.xml Normal file
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<class>
<keyword> class </keyword>
<identifier> SquareGame </identifier>
<symbol> { </symbol>
<classVarDec>
<keyword> field </keyword>
<identifier> Square </identifier>
<identifier> square </identifier>
<symbol> ; </symbol>
</classVarDec>
<classVarDec>
<keyword> field </keyword>
<keyword> int </keyword>
<identifier> direction </identifier>
<symbol> ; </symbol>
</classVarDec>
<subroutineDec>
<keyword> constructor </keyword>
<identifier> SquareGame </identifier>
<identifier> new </identifier>
<symbol> ( </symbol>
<parameterList>
</parameterList>
<symbol> ) </symbol>
<subroutineBody>
<symbol> { </symbol>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> square </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> Square </identifier>
<symbol> . </symbol>
<identifier> new </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<integerConstant> 0 </integerConstant>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<integerConstant> 0 </integerConstant>
</term>
</expression>
<symbol> , </symbol>
<expression>
<term>
<integerConstant> 30 </integerConstant>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<letStatement>
<keyword> let </keyword>
<identifier> direction </identifier>
<symbol> = </symbol>
<expression>
<term>
<integerConstant> 0 </integerConstant>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<returnStatement>
<keyword> return </keyword>
<expression>
<term>
<keyword> this </keyword>
</term>
</expression>
<symbol> ; </symbol>
</returnStatement>
</statements>
<symbol> } </symbol>
</subroutineBody>
</subroutineDec>
<subroutineDec>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> dispose </identifier>
<symbol> ( </symbol>
<parameterList>
</parameterList>
<symbol> ) </symbol>
<subroutineBody>
<symbol> { </symbol>
<statements>
<doStatement>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> dispose </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<doStatement>
<keyword> do </keyword>
<identifier> Memory </identifier>
<symbol> . </symbol>
<identifier> deAlloc </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<keyword> this </keyword>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<returnStatement>
<keyword> return </keyword>
<symbol> ; </symbol>
</returnStatement>
</statements>
<symbol> } </symbol>
</subroutineBody>
</subroutineDec>
<subroutineDec>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> moveSquare </identifier>
<symbol> ( </symbol>
<parameterList>
</parameterList>
<symbol> ) </symbol>
<subroutineBody>
<symbol> { </symbol>
<statements>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> direction </identifier>
</term>
<symbol> = </symbol>
<term>
<integerConstant> 1 </integerConstant>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<doStatement>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> moveUp </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> direction </identifier>
</term>
<symbol> = </symbol>
<term>
<integerConstant> 2 </integerConstant>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<doStatement>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> moveDown </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> direction </identifier>
</term>
<symbol> = </symbol>
<term>
<integerConstant> 3 </integerConstant>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<doStatement>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> moveLeft </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> direction </identifier>
</term>
<symbol> = </symbol>
<term>
<integerConstant> 4 </integerConstant>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<doStatement>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> moveRight </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<doStatement>
<keyword> do </keyword>
<identifier> Sys </identifier>
<symbol> . </symbol>
<identifier> wait </identifier>
<symbol> ( </symbol>
<expressionList>
<expression>
<term>
<integerConstant> 5 </integerConstant>
</term>
</expression>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
<returnStatement>
<keyword> return </keyword>
<symbol> ; </symbol>
</returnStatement>
</statements>
<symbol> } </symbol>
</subroutineBody>
</subroutineDec>
<subroutineDec>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> run </identifier>
<symbol> ( </symbol>
<parameterList>
</parameterList>
<symbol> ) </symbol>
<subroutineBody>
<symbol> { </symbol>
<varDec>
<keyword> var </keyword>
<keyword> char </keyword>
<identifier> key </identifier>
<symbol> ; </symbol>
</varDec>
<varDec>
<keyword> var </keyword>
<keyword> boolean </keyword>
<identifier> exit </identifier>
<symbol> ; </symbol>
</varDec>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> exit </identifier>
<symbol> = </symbol>
<expression>
<term>
<keyword> false </keyword>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<whileStatement>
<keyword> while </keyword>
<symbol> ( </symbol>
<expression>
<term>
<symbol> ~ </symbol>
<term>
<identifier> exit </identifier>
</term>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<whileStatement>
<keyword> while </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> key </identifier>
</term>
<symbol> = </symbol>
<term>
<integerConstant> 0 </integerConstant>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> key </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> Keyboard </identifier>
<symbol> . </symbol>
<identifier> keyPressed </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<doStatement>
<keyword> do </keyword>
<identifier> moveSquare </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
</statements>
<symbol> } </symbol>
</whileStatement>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> key </identifier>
</term>
<symbol> = </symbol>
<term>
<integerConstant> 81 </integerConstant>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> exit </identifier>
<symbol> = </symbol>
<expression>
<term>
<keyword> true </keyword>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> key </identifier>
</term>
<symbol> = </symbol>
<term>
<integerConstant> 90 </integerConstant>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<doStatement>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> decSize </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> key </identifier>
</term>
<symbol> = </symbol>
<term>
<integerConstant> 88 </integerConstant>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<doStatement>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> incSize </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> key </identifier>
</term>
<symbol> = </symbol>
<term>
<integerConstant> 131 </integerConstant>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> direction </identifier>
<symbol> = </symbol>
<expression>
<term>
<integerConstant> 1 </integerConstant>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> key </identifier>
</term>
<symbol> = </symbol>
<term>
<integerConstant> 133 </integerConstant>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> direction </identifier>
<symbol> = </symbol>
<expression>
<term>
<integerConstant> 2 </integerConstant>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> key </identifier>
</term>
<symbol> = </symbol>
<term>
<integerConstant> 130 </integerConstant>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> direction </identifier>
<symbol> = </symbol>
<expression>
<term>
<integerConstant> 3 </integerConstant>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<ifStatement>
<keyword> if </keyword>
<symbol> ( </symbol>
<expression>
<term>
<identifier> key </identifier>
</term>
<symbol> = </symbol>
<term>
<integerConstant> 132 </integerConstant>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> direction </identifier>
<symbol> = </symbol>
<expression>
<term>
<integerConstant> 4 </integerConstant>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
</statements>
<symbol> } </symbol>
</ifStatement>
<whileStatement>
<keyword> while </keyword>
<symbol> ( </symbol>
<expression>
<term>
<symbol> ~ </symbol>
<term>
<symbol> ( </symbol>
<expression>
<term>
<identifier> key </identifier>
</term>
<symbol> = </symbol>
<term>
<integerConstant> 0 </integerConstant>
</term>
</expression>
<symbol> ) </symbol>
</term>
</term>
</expression>
<symbol> ) </symbol>
<symbol> { </symbol>
<statements>
<letStatement>
<keyword> let </keyword>
<identifier> key </identifier>
<symbol> = </symbol>
<expression>
<term>
<identifier> Keyboard </identifier>
<symbol> . </symbol>
<identifier> keyPressed </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
</term>
</expression>
<symbol> ; </symbol>
</letStatement>
<doStatement>
<keyword> do </keyword>
<identifier> moveSquare </identifier>
<symbol> ( </symbol>
<expressionList>
</expressionList>
<symbol> ) </symbol>
<symbol> ; </symbol>
</doStatement>
</statements>
<symbol> } </symbol>
</whileStatement>
</statements>
<symbol> } </symbol>
</whileStatement>
<returnStatement>
<keyword> return </keyword>
<symbol> ; </symbol>
</returnStatement>
</statements>
<symbol> } </symbol>
</subroutineBody>
</subroutineDec>
<symbol> } </symbol>
</class>

315
10/Square/SquareGameT.xml Normal file
View File

@@ -0,0 +1,315 @@
<tokens>
<keyword> class </keyword>
<identifier> SquareGame </identifier>
<symbol> { </symbol>
<keyword> field </keyword>
<identifier> Square </identifier>
<identifier> square </identifier>
<symbol> ; </symbol>
<keyword> field </keyword>
<keyword> int </keyword>
<identifier> direction </identifier>
<symbol> ; </symbol>
<keyword> constructor </keyword>
<identifier> SquareGame </identifier>
<identifier> new </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> let </keyword>
<identifier> square </identifier>
<symbol> = </symbol>
<identifier> Square </identifier>
<symbol> . </symbol>
<identifier> new </identifier>
<symbol> ( </symbol>
<integerConstant> 0 </integerConstant>
<symbol> , </symbol>
<integerConstant> 0 </integerConstant>
<symbol> , </symbol>
<integerConstant> 30 </integerConstant>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> direction </identifier>
<symbol> = </symbol>
<integerConstant> 0 </integerConstant>
<symbol> ; </symbol>
<keyword> return </keyword>
<keyword> this </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> dispose </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> dispose </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Memory </identifier>
<symbol> . </symbol>
<identifier> deAlloc </identifier>
<symbol> ( </symbol>
<keyword> this </keyword>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> moveSquare </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> direction </identifier>
<symbol> = </symbol>
<integerConstant> 1 </integerConstant>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> moveUp </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> direction </identifier>
<symbol> = </symbol>
<integerConstant> 2 </integerConstant>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> moveDown </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> direction </identifier>
<symbol> = </symbol>
<integerConstant> 3 </integerConstant>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> moveLeft </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> direction </identifier>
<symbol> = </symbol>
<integerConstant> 4 </integerConstant>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> moveRight </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> do </keyword>
<identifier> Sys </identifier>
<symbol> . </symbol>
<identifier> wait </identifier>
<symbol> ( </symbol>
<integerConstant> 5 </integerConstant>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> run </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> var </keyword>
<keyword> char </keyword>
<identifier> key </identifier>
<symbol> ; </symbol>
<keyword> var </keyword>
<keyword> boolean </keyword>
<identifier> exit </identifier>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> exit </identifier>
<symbol> = </symbol>
<keyword> false </keyword>
<symbol> ; </symbol>
<keyword> while </keyword>
<symbol> ( </symbol>
<symbol> ~ </symbol>
<identifier> exit </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> while </keyword>
<symbol> ( </symbol>
<identifier> key </identifier>
<symbol> = </symbol>
<integerConstant> 0 </integerConstant>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> let </keyword>
<identifier> key </identifier>
<symbol> = </symbol>
<identifier> Keyboard </identifier>
<symbol> . </symbol>
<identifier> keyPressed </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> moveSquare </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> key </identifier>
<symbol> = </symbol>
<integerConstant> 81 </integerConstant>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> let </keyword>
<identifier> exit </identifier>
<symbol> = </symbol>
<keyword> true </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> key </identifier>
<symbol> = </symbol>
<integerConstant> 90 </integerConstant>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> decSize </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> key </identifier>
<symbol> = </symbol>
<integerConstant> 88 </integerConstant>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> square </identifier>
<symbol> . </symbol>
<identifier> incSize </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> key </identifier>
<symbol> = </symbol>
<integerConstant> 131 </integerConstant>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> let </keyword>
<identifier> direction </identifier>
<symbol> = </symbol>
<integerConstant> 1 </integerConstant>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> key </identifier>
<symbol> = </symbol>
<integerConstant> 133 </integerConstant>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> let </keyword>
<identifier> direction </identifier>
<symbol> = </symbol>
<integerConstant> 2 </integerConstant>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> key </identifier>
<symbol> = </symbol>
<integerConstant> 130 </integerConstant>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> let </keyword>
<identifier> direction </identifier>
<symbol> = </symbol>
<integerConstant> 3 </integerConstant>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> key </identifier>
<symbol> = </symbol>
<integerConstant> 132 </integerConstant>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> let </keyword>
<identifier> direction </identifier>
<symbol> = </symbol>
<integerConstant> 4 </integerConstant>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> while </keyword>
<symbol> ( </symbol>
<symbol> ~ </symbol>
<symbol> ( </symbol>
<identifier> key </identifier>
<symbol> = </symbol>
<integerConstant> 0 </integerConstant>
<symbol> ) </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> let </keyword>
<identifier> key </identifier>
<symbol> = </symbol>
<identifier> Keyboard </identifier>
<symbol> . </symbol>
<identifier> keyPressed </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> moveSquare </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<symbol> } </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<symbol> } </symbol>
</tokens>

561
10/Square/SquareT.xml Normal file
View File

@@ -0,0 +1,561 @@
<tokens>
<keyword> class </keyword>
<identifier> Square </identifier>
<symbol> { </symbol>
<keyword> field </keyword>
<keyword> int </keyword>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> ; </symbol>
<keyword> field </keyword>
<keyword> int </keyword>
<identifier> size </identifier>
<symbol> ; </symbol>
<keyword> constructor </keyword>
<identifier> Square </identifier>
<identifier> new </identifier>
<symbol> ( </symbol>
<keyword> int </keyword>
<identifier> Ax </identifier>
<symbol> , </symbol>
<keyword> int </keyword>
<identifier> Ay </identifier>
<symbol> , </symbol>
<keyword> int </keyword>
<identifier> Asize </identifier>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> let </keyword>
<identifier> x </identifier>
<symbol> = </symbol>
<identifier> Ax </identifier>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> y </identifier>
<symbol> = </symbol>
<identifier> Ay </identifier>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> size </identifier>
<symbol> = </symbol>
<identifier> Asize </identifier>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> draw </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> return </keyword>
<keyword> this </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> dispose </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> Memory </identifier>
<symbol> . </symbol>
<identifier> deAlloc </identifier>
<symbol> ( </symbol>
<keyword> this </keyword>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> draw </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<keyword> true </keyword>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> , </symbol>
<identifier> x </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> erase </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<keyword> false </keyword>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> , </symbol>
<identifier> x </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> incSize </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<symbol> ( </symbol>
<symbol> ( </symbol>
<identifier> y </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> ) </symbol>
<symbol> &lt; </symbol>
<integerConstant> 254 </integerConstant>
<symbol> ) </symbol>
<symbol> &amp; </symbol>
<symbol> ( </symbol>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> ) </symbol>
<symbol> &lt; </symbol>
<integerConstant> 510 </integerConstant>
<symbol> ) </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> erase </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> size </identifier>
<symbol> = </symbol>
<identifier> size </identifier>
<symbol> + </symbol>
<integerConstant> 2 </integerConstant>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> draw </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> decSize </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> size </identifier>
<symbol> &gt; </symbol>
<integerConstant> 2 </integerConstant>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> erase </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> size </identifier>
<symbol> = </symbol>
<identifier> size </identifier>
<symbol> - </symbol>
<integerConstant> 2 </integerConstant>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> draw </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> moveUp </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> y </identifier>
<symbol> &gt; </symbol>
<integerConstant> 1 </integerConstant>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<keyword> false </keyword>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<symbol> ( </symbol>
<identifier> y </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> ) </symbol>
<symbol> - </symbol>
<integerConstant> 1 </integerConstant>
<symbol> , </symbol>
<identifier> x </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> y </identifier>
<symbol> = </symbol>
<identifier> y </identifier>
<symbol> - </symbol>
<integerConstant> 2 </integerConstant>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<keyword> true </keyword>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> , </symbol>
<identifier> x </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> + </symbol>
<integerConstant> 1 </integerConstant>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> moveDown </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<symbol> ( </symbol>
<identifier> y </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> ) </symbol>
<symbol> &lt; </symbol>
<integerConstant> 254 </integerConstant>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<keyword> false </keyword>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> , </symbol>
<identifier> x </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> + </symbol>
<integerConstant> 1 </integerConstant>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> y </identifier>
<symbol> = </symbol>
<identifier> y </identifier>
<symbol> + </symbol>
<integerConstant> 2 </integerConstant>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<keyword> true </keyword>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<symbol> ( </symbol>
<identifier> y </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> ) </symbol>
<symbol> - </symbol>
<integerConstant> 1 </integerConstant>
<symbol> , </symbol>
<identifier> x </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> moveLeft </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> &gt; </symbol>
<integerConstant> 1 </integerConstant>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<keyword> false </keyword>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> ) </symbol>
<symbol> - </symbol>
<integerConstant> 1 </integerConstant>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> , </symbol>
<identifier> x </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> x </identifier>
<symbol> = </symbol>
<identifier> x </identifier>
<symbol> - </symbol>
<integerConstant> 2 </integerConstant>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<keyword> true </keyword>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> , </symbol>
<identifier> x </identifier>
<symbol> + </symbol>
<integerConstant> 1 </integerConstant>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> method </keyword>
<keyword> void </keyword>
<identifier> moveRight </identifier>
<symbol> ( </symbol>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> if </keyword>
<symbol> ( </symbol>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> ) </symbol>
<symbol> &lt; </symbol>
<integerConstant> 510 </integerConstant>
<symbol> ) </symbol>
<symbol> { </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<keyword> false </keyword>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> , </symbol>
<identifier> x </identifier>
<symbol> + </symbol>
<integerConstant> 1 </integerConstant>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> let </keyword>
<identifier> x </identifier>
<symbol> = </symbol>
<identifier> x </identifier>
<symbol> + </symbol>
<integerConstant> 2 </integerConstant>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> setColor </identifier>
<symbol> ( </symbol>
<keyword> true </keyword>
<symbol> ) </symbol>
<symbol> ; </symbol>
<keyword> do </keyword>
<identifier> Screen </identifier>
<symbol> . </symbol>
<identifier> drawRectangle </identifier>
<symbol> ( </symbol>
<symbol> ( </symbol>
<identifier> x </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> ) </symbol>
<symbol> - </symbol>
<integerConstant> 1 </integerConstant>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> , </symbol>
<identifier> x </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> , </symbol>
<identifier> y </identifier>
<symbol> + </symbol>
<identifier> size </identifier>
<symbol> ) </symbol>
<symbol> ; </symbol>
<symbol> } </symbol>
<keyword> return </keyword>
<symbol> ; </symbol>
<symbol> } </symbol>
<symbol> } </symbol>
</tokens>