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Commit eebe529b authored by lstrsrmn's avatar lstrsrmn
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.idea/uiDesigner.xml 0 → 100644
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View file @ eebe529b
<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="Palette2">
<group name="Swing">
<item class="com.intellij.uiDesigner.HSpacer" tooltip-text="Horizontal Spacer" icon="/com/intellij/uiDesigner/icons/hspacer.png" removable="false" auto-create-binding="false" can-attach-label="false">
<default-constraints vsize-policy="1" hsize-policy="6" anchor="0" fill="1" />
</item>
<item class="com.intellij.uiDesigner.VSpacer" tooltip-text="Vertical Spacer" icon="/com/intellij/uiDesigner/icons/vspacer.png" removable="false" auto-create-binding="false" can-attach-label="false">
<default-constraints vsize-policy="6" hsize-policy="1" anchor="0" fill="2" />
</item>
<item class="javax.swing.JPanel" icon="/com/intellij/uiDesigner/icons/panel.png" removable="false" auto-create-binding="false" can-attach-label="false">
<default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3" />
</item>
<item class="javax.swing.JScrollPane" icon="/com/intellij/uiDesigner/icons/scrollPane.png" removable="false" auto-create-binding="false" can-attach-label="true">
<default-constraints vsize-policy="7" hsize-policy="7" anchor="0" fill="3" />
</item>
<item class="javax.swing.JButton" icon="/com/intellij/uiDesigner/icons/button.png" removable="false" auto-create-binding="true" can-attach-label="false">
<default-constraints vsize-policy="0" hsize-policy="3" anchor="0" fill="1" />
<initial-values>
<property name="text" value="Button" />
</initial-values>
</item>
<item class="javax.swing.JRadioButton" icon="/com/intellij/uiDesigner/icons/radioButton.png" removable="false" auto-create-binding="true" can-attach-label="false">
<default-constraints vsize-policy="0" hsize-policy="3" anchor="8" fill="0" />
<initial-values>
<property name="text" value="RadioButton" />
</initial-values>
</item>
<item class="javax.swing.JCheckBox" icon="/com/intellij/uiDesigner/icons/checkBox.png" removable="false" auto-create-binding="true" can-attach-label="false">
<default-constraints vsize-policy="0" hsize-policy="3" anchor="8" fill="0" />
<initial-values>
<property name="text" value="CheckBox" />
</initial-values>
</item>
<item class="javax.swing.JLabel" icon="/com/intellij/uiDesigner/icons/label.png" removable="false" auto-create-binding="false" can-attach-label="false">
<default-constraints vsize-policy="0" hsize-policy="0" anchor="8" fill="0" />
<initial-values>
<property name="text" value="Label" />
</initial-values>
</item>
<item class="javax.swing.JTextField" icon="/com/intellij/uiDesigner/icons/textField.png" removable="false" auto-create-binding="true" can-attach-label="true">
<default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
<preferred-size width="150" height="-1" />
</default-constraints>
</item>
<item class="javax.swing.JPasswordField" icon="/com/intellij/uiDesigner/icons/passwordField.png" removable="false" auto-create-binding="true" can-attach-label="true">
<default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
<preferred-size width="150" height="-1" />
</default-constraints>
</item>
<item class="javax.swing.JFormattedTextField" icon="/com/intellij/uiDesigner/icons/formattedTextField.png" removable="false" auto-create-binding="true" can-attach-label="true">
<default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
<preferred-size width="150" height="-1" />
</default-constraints>
</item>
<item class="javax.swing.JTextArea" icon="/com/intellij/uiDesigner/icons/textArea.png" removable="false" auto-create-binding="true" can-attach-label="true">
<default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
<preferred-size width="150" height="50" />
</default-constraints>
</item>
<item class="javax.swing.JTextPane" icon="/com/intellij/uiDesigner/icons/textPane.png" removable="false" auto-create-binding="true" can-attach-label="true">
<default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
<preferred-size width="150" height="50" />
</default-constraints>
</item>
<item class="javax.swing.JEditorPane" icon="/com/intellij/uiDesigner/icons/editorPane.png" removable="false" auto-create-binding="true" can-attach-label="true">
<default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
<preferred-size width="150" height="50" />
</default-constraints>
</item>
<item class="javax.swing.JComboBox" icon="/com/intellij/uiDesigner/icons/comboBox.png" removable="false" auto-create-binding="true" can-attach-label="true">
<default-constraints vsize-policy="0" hsize-policy="2" anchor="8" fill="1" />
</item>
<item class="javax.swing.JTable" icon="/com/intellij/uiDesigner/icons/table.png" removable="false" auto-create-binding="true" can-attach-label="false">
<default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
<preferred-size width="150" height="50" />
</default-constraints>
</item>
<item class="javax.swing.JList" icon="/com/intellij/uiDesigner/icons/list.png" removable="false" auto-create-binding="true" can-attach-label="false">
<default-constraints vsize-policy="6" hsize-policy="2" anchor="0" fill="3">
<preferred-size width="150" height="50" />
</default-constraints>
</item>
<item class="javax.swing.JTree" icon="/com/intellij/uiDesigner/icons/tree.png" removable="false" auto-create-binding="true" can-attach-label="false">
<default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
<preferred-size width="150" height="50" />
</default-constraints>
</item>
<item class="javax.swing.JTabbedPane" icon="/com/intellij/uiDesigner/icons/tabbedPane.png" removable="false" auto-create-binding="true" can-attach-label="false">
<default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3">
<preferred-size width="200" height="200" />
</default-constraints>
</item>
<item class="javax.swing.JSplitPane" icon="/com/intellij/uiDesigner/icons/splitPane.png" removable="false" auto-create-binding="false" can-attach-label="false">
<default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3">
<preferred-size width="200" height="200" />
</default-constraints>
</item>
<item class="javax.swing.JSpinner" icon="/com/intellij/uiDesigner/icons/spinner.png" removable="false" auto-create-binding="true" can-attach-label="true">
<default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1" />
</item>
<item class="javax.swing.JSlider" icon="/com/intellij/uiDesigner/icons/slider.png" removable="false" auto-create-binding="true" can-attach-label="false">
<default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1" />
</item>
<item class="javax.swing.JSeparator" icon="/com/intellij/uiDesigner/icons/separator.png" removable="false" auto-create-binding="false" can-attach-label="false">
<default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3" />
</item>
<item class="javax.swing.JProgressBar" icon="/com/intellij/uiDesigner/icons/progressbar.png" removable="false" auto-create-binding="true" can-attach-label="false">
<default-constraints vsize-policy="0" hsize-policy="6" anchor="0" fill="1" />
</item>
<item class="javax.swing.JToolBar" icon="/com/intellij/uiDesigner/icons/toolbar.png" removable="false" auto-create-binding="false" can-attach-label="false">
<default-constraints vsize-policy="0" hsize-policy="6" anchor="0" fill="1">
<preferred-size width="-1" height="20" />
</default-constraints>
</item>
<item class="javax.swing.JToolBar$Separator" icon="/com/intellij/uiDesigner/icons/toolbarSeparator.png" removable="false" auto-create-binding="false" can-attach-label="false">
<default-constraints vsize-policy="0" hsize-policy="0" anchor="0" fill="1" />
</item>
<item class="javax.swing.JScrollBar" icon="/com/intellij/uiDesigner/icons/scrollbar.png" removable="false" auto-create-binding="true" can-attach-label="false">
<default-constraints vsize-policy="6" hsize-policy="0" anchor="0" fill="2" />
</item>
</group>
</component>
</project>
\ No newline at end of file
src/Expression.java
+ 29
− 9
View file @ eebe529b
...@@ -3,10 +3,17 @@ import java.util.List; ...@@ -3,10 +3,17 @@ import java.util.List;
import java.util.Objects; import java.util.Objects;
public class Expression { public class Expression {
/**
* @param <T> pure virtual interface of template T in order to have an abstracted consistent way of retrieving data
* , made safe by isinstance checks before any grab using getValue().
*/
public interface Value<T> { public interface Value<T> {
public T getValue(); public T getValue();
} }
/**
* A Value that holds an integer
*/
static class IntVal implements Value<Integer> { static class IntVal implements Value<Integer> {
Integer v; Integer v;
...@@ -18,6 +25,9 @@ public class Expression { ...@@ -18,6 +25,9 @@ public class Expression {
} }
} }
/**
* A Value that holds an bool
*/
static class BoolValue implements Value<Boolean> { static class BoolValue implements Value<Boolean> {
boolean b; boolean b;
...@@ -30,10 +40,16 @@ public class Expression { ...@@ -30,10 +40,16 @@ public class Expression {
} }
} }
/**
* Abstracted expression, all expressions must be evaluable, the template of value doesn't matter as its abstracted
*/
interface Expr { interface Expr {
Value run(ProgramHandler.ProgramState s); Value run(ProgramHandler.ProgramState s);
} }
/**
* a constant expression, value template type doesnt matter because any value can be constant
*/
public static class LiteralExpr implements Expr { public static class LiteralExpr implements Expr {
Value x; Value x;
...@@ -47,11 +63,15 @@ public class Expression { ...@@ -47,11 +63,15 @@ public class Expression {
} }
} }
static class VarExpr implements Expr {
/**
* a Variable expression, value template type matters because variables are lock into being Integers
*/
static class VarExpr implements Expr {
String name; String name;
@Override @Override
public Value run(ProgramHandler.ProgramState s) { public Value<Integer> run(ProgramHandler.ProgramState s) {
return new IntVal(s.varLookup.get(name)); return new IntVal(s.varLookup.get(name));
} }
...@@ -60,6 +80,10 @@ public class Expression { ...@@ -60,6 +80,10 @@ public class Expression {
} }
} }
/**
* A not comparison expression, the expr return types are not templated as this is irelevant, however the output
* value will always ben boolean
*/
static class NotExpr implements Expr { static class NotExpr implements Expr {
Expr lhs, rhs; Expr lhs, rhs;
...@@ -67,17 +91,13 @@ public class Expression { ...@@ -67,17 +91,13 @@ public class Expression {
this.lhs = lhs; this.lhs = lhs;
this.rhs = rhs; this.rhs = rhs;
} }
public Value run(ProgramHandler.ProgramState s) { public Value<Boolean> run(ProgramHandler.ProgramState s) {
Value lhsV = lhs.run(s); Value lhsV = lhs.run(s);
Value rhsV = rhs.run(s); Value rhsV = rhs.run(s);
if (lhsV.getClass() == rhsV.getClass()) { if (lhsV.getClass() == rhsV.getClass()) {
return new BoolValue(lhsV.getValue() == rhsV.getValue()); return new BoolValue(lhsV.getValue() != rhsV.getValue());
} }
return new BoolValue(false); return new BoolValue(true);
} }
} }
public static class ExpressionBuilder {
List<Expr> x = new ArrayList<Expr>();
}
} }
src/Interpreter.java
+ 9
− 1
View file @ eebe529b
...@@ -2,6 +2,9 @@ import java.io.File; ...@@ -2,6 +2,9 @@ import java.io.File;
import java.io.FileNotFoundException; import java.io.FileNotFoundException;
import java.util.*; import java.util.*;
/**
* the main class, runs all the sub-routinse
*/
public class Interpreter { public class Interpreter {
public static void main(String[] args) { public static void main(String[] args) {
try { try {
...@@ -15,10 +18,15 @@ public class Interpreter { ...@@ -15,10 +18,15 @@ public class Interpreter {
data.append(" "); data.append(" ");
} }
reader.close(); reader.close();
Lexer.LexerContainer container = Lexer.lexer(data.toString().trim().replaceAll(" +", " ")); // Creating a container from a static lexer method
Pair<List<Token>, List<String>> container = Lexer.lexer(data.toString().trim().replaceAll(" +", " "));
// creates a new state
ProgramHandler.ProgramState state = new ProgramHandler.ProgramState(); ProgramHandler.ProgramState state = new ProgramHandler.ProgramState();
// creates a new main program from the parser
ProgramHandler.Program program = Parser.parse(container); ProgramHandler.Program program = Parser.parse(container);
// starts the programs running
program.run(state); program.run(state);
// prints all variables and values
for (Map.Entry<String, Integer> entry : state.varLookup.entrySet()) { for (Map.Entry<String, Integer> entry : state.varLookup.entrySet()) {
System.out.println("Variable: " + entry.getKey() + ", Value: " + entry.getValue()); System.out.println("Variable: " + entry.getKey() + ", Value: " + entry.getValue());
} }
......
src/Lexer.java
+ 11
− 14
View file @ eebe529b
...@@ -2,24 +2,21 @@ import java.util.ArrayList; ...@@ -2,24 +2,21 @@ import java.util.ArrayList;
import java.util.HashMap; import java.util.HashMap;
import java.util.List; import java.util.List;
/**
* The lexers job is to take a string from a file and convert it into a list of tokens and a list of variables referenced
* l : String -> [token]
*/
public class Lexer { public class Lexer {
public static class LexerContainer {
public List<Token> tokens;
List<String> vars;
public LexerContainer(List<Token> tokens, List<String> vars) {
this.tokens = tokens;
this.vars = vars;
}
}
/** /**
* @param file the file to be processed * @param file the file to be processed
* @return list of tokens produced by the lexer * @return a Pair holding a list of the tokens and a list of the variable names
*/ */
public static LexerContainer lexer(String file) { public static Pair<List<Token>, List<String>> lexer(String file) {
List<Token> tokens = new ArrayList<Token>(); List<Token> tokens = new ArrayList<>();
List<String> vars = new ArrayList<>(); List<String> vars = new ArrayList<>();
// Looks through the file, identifying and isolating all tokens and all variables and constants, such that
// the order of vars and numbers in the tokens matches with the correct names/values in the vars list
int previousChar = 0; int previousChar = 0;
for (int currentChar = 0; currentChar < file.length(); currentChar++) { for (int currentChar = 0; currentChar < file.length(); currentChar++) {
if (file.charAt(currentChar) == ' ' || file.charAt(currentChar) == ';') { if (file.charAt(currentChar) == ' ' || file.charAt(currentChar) == ';') {
...@@ -69,6 +66,6 @@ public class Lexer { ...@@ -69,6 +66,6 @@ public class Lexer {
previousChar = currentChar; previousChar = currentChar;
} }
} }
return new LexerContainer(tokens, vars); return new Pair<>(tokens, vars);
} }
} }
src/Pair.java
+ 1
− 0
View file @ eebe529b
// Simple templated pair class because this was too hard for the java developers to do :)
public class Pair<T, K> { public class Pair<T, K> {
T first; T first;
K second; K second;
......
src/Parser.java
+ 58
− 8
View file @ eebe529b
import java.util.List; import java.util.List;
/**
* A parser that p : [token] -> program
*/
public class Parser { public class Parser {
public static ProgramHandler.Program parse(Lexer.LexerContainer container) { /**
List<Token> tokens = container.tokens; * @param container the list of tokens and variables generated by the lexer
List<String> vars = container.vars; * @return the program that contains all the statements in the program
*/
public static ProgramHandler.Program parse(Pair<List<Token>, List<String>> container) {
// pulls the individual lists from the pair for convenience
List<Token> tokens = container.first;
List<String> vars = container.second;
// creates a new program where commands can be assigned
ProgramHandler.Program program = new ProgramHandler.Program(); ProgramHandler.Program program = new ProgramHandler.Program();
// goes through each token
while (!tokens.isEmpty()) { while (!tokens.isEmpty()) {
Token token = tokens.remove(0); Token token = tokens.remove(0);
// removes the first one and stores it
if (token != Token.SemiColon) { if (token != Token.SemiColon) {
switch (token) { switch (token) {
case Clear -> { case Clear -> {
if (tokens.remove(0) == Token.Var) { if (tokens.remove(0) == Token.Var) {
// creates a clear statement, creates a Variable instance from the name of the next variable
ProgramHandler.ClearStatement statement = new ProgramHandler.ClearStatement(); ProgramHandler.ClearStatement statement = new ProgramHandler.ClearStatement();
statement.v = new ProgramHandler.Variable(vars.remove(0)); statement.v = new ProgramHandler.Variable(vars.remove(0));
// adds the statement to the program to be run
program.stmts.add(statement); program.stmts.add(statement);
} else { } else {
System.err.println("Clear not followed by variable"); System.err.println("Clear not followed by variable");
...@@ -22,8 +36,10 @@ public class Parser { ...@@ -22,8 +36,10 @@ public class Parser {
} }
case Incr -> { case Incr -> {
if (tokens.remove(0) == Token.Var) { if (tokens.remove(0) == Token.Var) {
// creates an incr statement, creates a Variable instance from the name of the next variable
ProgramHandler.IncrStatement statement = new ProgramHandler.IncrStatement(); ProgramHandler.IncrStatement statement = new ProgramHandler.IncrStatement();
statement.v = new ProgramHandler.Variable(vars.remove(0)); statement.v = new ProgramHandler.Variable(vars.remove(0));
// adds the statement to the program to be run
program.stmts.add(statement); program.stmts.add(statement);
} else { } else {
System.err.println("Incr not followed by variable"); System.err.println("Incr not followed by variable");
...@@ -31,18 +47,25 @@ public class Parser { ...@@ -31,18 +47,25 @@ public class Parser {
} }
case Decr -> { case Decr -> {
if (tokens.remove(0) == Token.Var) { if (tokens.remove(0) == Token.Var) {
// creates a decr statement, creates a Variable instance from the name of the next variable
ProgramHandler.DecrStatement statement = new ProgramHandler.DecrStatement(); ProgramHandler.DecrStatement statement = new ProgramHandler.DecrStatement();
statement.v = new ProgramHandler.Variable(vars.remove(0)); statement.v = new ProgramHandler.Variable(vars.remove(0));
// adds the statement to the program to be run
program.stmts.add(statement); program.stmts.add(statement);
} else { } else {
System.err.println("Decr not followed by variable"); System.err.println("Decr not followed by variable");
} }
} }
case While -> { case While -> {
// creates a while loop
ProgramHandler.WhileLoop loop = new ProgramHandler.WhileLoop(); ProgramHandler.WhileLoop loop = new ProgramHandler.WhileLoop();
// uses the expression parser to develop an expression
Expression.Expr expr = eParse(container); Expression.Expr expr = eParse(container);
// gives the loop the expression
loop.expr = expr; loop.expr = expr;
// recursively pass until next end to create program to be looped
loop.p = parse(container); loop.p = parse(container);
// add it to this programs statements
program.stmts.add(loop); program.stmts.add(loop);
} }
case End -> { case End -> {
...@@ -58,32 +81,58 @@ public class Parser { ...@@ -58,32 +81,58 @@ public class Parser {
return program; return program;
} }
private static Expression.Expr eParse(Lexer.LexerContainer container){ /**
List<Token> tokens = container.tokens; * @param container contains tokens and variable names
List<String> vars = container.vars; * @return
*/
private static Expression.Expr eParse(Pair<List<Token>, List<String>> container){
List<Token> tokens = container.first;
List<String> vars = container.second;
Expression.Expr e = null; Expression.Expr e = null;
while (!tokens.isEmpty()) { while (!tokens.isEmpty()) {
// takes first token
Token token = tokens.remove(0); Token token = tokens.remove(0);
switch (token) { switch (token) {
case Var -> { case Var -> {
// if expression doesnt exist, create one
if (e == null) { if (e == null) {
e = new Expression.VarExpr(vars.remove(0)); e = new Expression.VarExpr(vars.remove(0));
} else { } else {
System.err.println("Expression not valid"); // this means 2 variables or numbers are in a row which is meaningless
System.err.print("Expression not valid around " + token);
for (int i = 0; i < 5; i++) {
if (i < tokens.size())
System.err.print(tokens.get(i));
}
System.exit(1); System.exit(1);
} }
} case Number -> { } case Number -> {
if (e == null) { if (e == null) {
// if expression doesnt exist, create one
e = new Expression.LiteralExpr(new Expression.IntVal(Integer.parseInt(vars.remove(0)))); e = new Expression.LiteralExpr(new Expression.IntVal(Integer.parseInt(vars.remove(0))));
} else { } else {
System.err.println("Expression not valid"); // this means 2 variables or numbers are in a row which is meaningless
System.err.print("Expression not valid around " + token);
for (int i = 0; i < 5; i++) {
if (i < tokens.size())
System.err.print(tokens.get(i));
}
System.exit(1); System.exit(1);
} }
} case Not -> { } case Not -> {
if (e != null) { if (e != null) {
// if preceded by an expression continue
Expression.Expr rhs = eParse(container); Expression.Expr rhs = eParse(container);
e = new Expression.NotExpr(e, rhs); e = new Expression.NotExpr(e, rhs);
} else {
// this means not isn't preceded by a variable or number, making it invalid
System.err.print("Expression not valid around " + token);
for (int i = 0; i < 5; i++) {
if (i < tokens.size())
System.err.print(tokens.get(i));
}
System.exit(1);
} }
} case Do, End, SemiColon -> { } case Do, End, SemiColon -> {
return e; return e;
...@@ -92,6 +141,7 @@ public class Parser { ...@@ -92,6 +141,7 @@ public class Parser {
} }
System.err.println("Expr never ended"); System.err.println("Expr never ended");
System.exit(1); System.exit(1);
// code never reached, here to satisfy javac
return new Expression.LiteralExpr(new Expression.IntVal(1)); return new Expression.LiteralExpr(new Expression.IntVal(1));
} }
} }
src/ProgramHandler.java
+ 63
− 5
View file @ eebe529b
...@@ -21,10 +21,17 @@ public class ProgramHandler { ...@@ -21,10 +21,17 @@ public class ProgramHandler {
return single_instance; return single_instance;
} }
/**
* Pure Virtual interface in order to create a set of programs that all have the void run(ProgramState) method
*/
interface Runnable { interface Runnable {
public void run(ProgramState state); public void run(ProgramState state);
} }
/**
* All statements must be runnable, this is a wrapper class to determine what is a statement and what is just runnable
*/
static class Statement implements Runnable { static class Statement implements Runnable {
@Override @Override
public void run(ProgramState state) { public void run(ProgramState state) {
...@@ -32,79 +39,130 @@ public class ProgramHandler { ...@@ -32,79 +39,130 @@ public class ProgramHandler {
} }
} }
/**
* Wrapper for a hash map, containing variables names and values
*/
static class ProgramState { static class ProgramState {
public HashMap<String, Integer> varLookup = new HashMap<>(); public HashMap<String, Integer> varLookup = new HashMap<>();
public HashMap<String, Integer> getState() {
return varLookup;
}
} }
/**
* A program stores a list of statements which all impliment the function run(ProgramState) meaning that it can run
* all statements in its program
*/
static class Program implements Runnable { static class Program implements Runnable {
public List<Statement> stmts = new ArrayList<Statement>(); public List<Statement> stmts = new ArrayList<Statement>();
/**
* implimentation of the abstract Runnable's void run(ProgramState)
* @param state holds the varLookup
*/
@Override @Override
public void run(ProgramState state) { public void run(ProgramState state) {
// loops through all statements and runs them each
for (Statement statement : stmts) { for (Statement statement : stmts) {
statement.run(state); statement.run(state);
} }
} }
} }
/**
* "Clear" statement implementation
*/
static class ClearStatement extends Statement { static class ClearStatement extends Statement {
// the variable to be worked on when ran
public Variable v; public Variable v;
/**
* @param state the varLookup
*/
@Override @Override
public void run(ProgramState state) { public void run(ProgramState state) {
// checks if the variable exists
if (!state.varLookup.containsKey(v.name)) { if (!state.varLookup.containsKey(v.name)) {
// if no, create it
state.varLookup.put(v.name, 0); state.varLookup.put(v.name, 0);
} else { } else {
// if yes, set it to 0
state.varLookup.replace(v.name, 0); state.varLookup.replace(v.name, 0);
} }
} }
} }
/**
* "Incr" statement implementation
*/
static class IncrStatement extends Statement { static class IncrStatement extends Statement {
// the variable to be worked on when ran
public Variable v; public Variable v;
/**
* @param state the varLookup container
*/
@Override @Override
public void run(ProgramState state) { public void run(ProgramState state) {
if (state.varLookup.containsKey(v.name)) { if (state.varLookup.containsKey(v.name)) {
// if v exists in varLookup, increase value by 1
int curr = state.varLookup.get(v.name); int curr = state.varLookup.get(v.name);
state.varLookup.replace(v.name, curr + 1); state.varLookup.replace(v.name, curr + 1);
} }
} }
} }
/**
* "Decr" statement implementation
*/
static class DecrStatement extends Statement { static class DecrStatement extends Statement {
// the variable to be worked on when ran
public Variable v; public Variable v;
/**
* @param state varLookup container
*/
@Override @Override
public void run(ProgramState state) { public void run(ProgramState state) {
if (state.varLookup.containsKey(v.name)) { if (state.varLookup.containsKey(v.name)) {
// if v in varLookup, decrease value by 1
int curr = state.varLookup.get(v.name); int curr = state.varLookup.get(v.name);
state.varLookup.replace(v.name, curr - 1); state.varLookup.replace(v.name, curr - 1);
} }
} }
} }
/**
* Implementation of while loop
*/
static class WhileLoop extends Statement { static class WhileLoop extends Statement {
// a program of its content to recursively run
public Program p; public Program p;
// an expression that if it returns a boolValue, will determine when the loop runs or continues
public Expression.Expr expr; public Expression.Expr expr;
/**
* @param state varLookup container
*/
@Override @Override
public void run(ProgramState state) { public void run(ProgramState state) {
// gets the value from the expression at this instance - note value is an abstract class and val is a sub class
// to Value
Expression.Value val = expr.run(state); Expression.Value val = expr.run(state);
Expression.BoolValue boolValue = val instanceof Expression.BoolValue ? ((Expression.BoolValue) val) : null; Expression.BoolValue boolValue = val instanceof Expression.BoolValue ? ((Expression.BoolValue) val) : null;
// Checks that val is a boolValue, and creates a new boolValue
if (boolValue != null) { if (boolValue != null) {
if (!boolValue.b) { // runs if the bool is true
if (boolValue.b) {
// runs the recursive program
p.run(state); p.run(state);
// reruns "void run(ProgramState)" to check expr again and continue until the bool is false
run(state); run(state);
} }
} else { } else {
// if the expression is not of boolType, the user has made a mistake and not properly defined their
// Expression
System.err.println("Wrong Expression Type"); System.err.println("Wrong Expression Type");
} }
} }
} }
} }
src/Token.java
+ 1
− 0
View file @ eebe529b
// all different tokens usable by the lexer
public enum Token { public enum Token {
Clear, Clear,
Incr, Incr,
......
src/program.bb
+ 15
− 7
View file @ eebe529b
clear X; clear X;
clear Y;
incr Y;
clear jakub;
while jakub not 7 do;
incr jakub;
end;
incr X;
incr X; incr X;
incr X; incr X;
clear Y;
incr Y;
incr Y;
incr Y;
clear Z;
while X not 0 do; while X not 0 do;
clear W;
while Y not 0 do;
incr Z;
incr W;
decr Y;
end;
while W not 0 do;
incr Y;
decr W;
end;
decr X; decr X;
end; end;
\ No newline at end of file
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