Started on the interpreter

wk2/Java/src/jrr1g18/bb/Interpreter.java

+package jrr1g18.bb;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class Interpreter {
+
+    private String m_code;
+    private int m_idx;
+
+    public static boolean isInt(String character) {
+	return character.matches("\\d");
+    }
+
+    public Interpreter(String code) {
+	m_code = new String(code);
+	m_idx = 0;
+    }
+
+    public Token getNextToken() {
+	if(m_idx > m_code.length()) {
+	    return new Token(TokenType.EOF);
+	}
+	String nextChar = "" + m_code.charAt(m_idx);
+	Token token;
+	if(nextChar.equals(";")) {
+	    // Semicolon
+	    token = new Token(TokenType.SEMICOLON);
+	} else if(isInt(nextChar)) {
+	    // Integer
+	    Matcher m = Pattern.compile("\\d+").matcher(m_code);
+	    m.find(m_idx);
+	    token = new ValueToken(TokenType.INTEGER, "" + nextChar);
+	} else {
+	    // Variable or instruction
+	    Matcher m = Pattern.compile("[A-Za-z][A-Za-z\\d]+").matcher(m_code);
+	    m.find(m_idx);
+	    String name = m.group();
+	    switch (name) {
+	    case "incr":
+		token = new Token(TokenType.INCR);
+		break;
+	    case "decr":
+		token = new Token(TokenType.DECR);
+		break;
+	    case "clear":
+		token = new Token(TokenType.CLEAR);
+		break;
+	    default:
+		token = new ValueToken(TokenType.IDENTIFIER, name);
+		break;
+	    }
+	}
+	return token;
+    }
+}

wk2/Java/src/jrr1g18/bb/Main.java

+package jrr1g18.bb;
+
+public class Main {
+
+    public static void main(String[] args) {
+
+    }
+
+}

wk2/Java/src/jrr1g18/bb/Token.java

+package jrr1g18.bb;
+
+public class Token {
+    final TokenType m_type;
+
+    public Token(TokenType type) {
+	m_type = type;
+    }
+
+}
\ No newline at end of file

wk2/Java/src/jrr1g18/bb/TokenType.java

+package jrr1g18.bb;
+
+public enum TokenType {
+    EOF, INTEGER, SEMICOLON, IDENTIFIER, INCR, DECR, CLEAR
+}

wk2/Java/src/jrr1g18/bb/ValueToken.java

+package jrr1g18.bb;
+
+public class ValueToken extends Token {
+
+    String m_value;
+
+    public ValueToken(TokenType type, String value) {
+	super(type);
+	m_value = value;
+    }
+
+    public ValueToken(TokenType type) {
+	super(type);
+    }
+
+    public String getValue() {
+	return m_value;
+    }
+
+    public void setValue(ValueToken value) {
+	m_value = value.getValue();
+    }
+
+    public void setValue(String value) {
+	m_value = value;
+    }
+}