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Sean O'Connor
2025-11-09 14:14:30 -05:00
parent 04b208d9d4
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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>

64
10/ExpressionLessSquare/MainT.xml Normal file
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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;
}
}

967
10/ExpressionLessSquare/Square.xml Normal file
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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
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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/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
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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>
</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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<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
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@@ -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>