Simplify code generation using overridden AST methods.

Triangle.Compiler/src/main/java/triangle/abstractSyntaxTrees/expressions/CharacterExpression.java

@@ -30,4 +30,14 @@ public class CharacterExpression extends Expression {
 	}
 
 	public final CharacterLiteral CL;
+	
+	@Override
+	public boolean isLiteral() {
+		return true;
+	}
+	
+	@Override
+	public int getValue() {
+		return CL.getValue();
+	}
 }

Triangle.Compiler/src/main/java/triangle/abstractSyntaxTrees/expressions/Expression.java

@@ -28,6 +28,14 @@ public abstract class Expression extends AbstractSyntaxTree {
 
 	public TypeDenoter type;
 
+	public boolean isLiteral() {
+		return false;
+	}
+
+	public int getValue() {
+		throw new UnsupportedOperationException();
+	}
+
 	public abstract <TArg, TResult> TResult visit(ExpressionVisitor<TArg, TResult> visitor, TArg arg);
 
 	public <TArg, TResult> TResult visit(ExpressionVisitor<TArg, TResult> visitor) {

Triangle.Compiler/src/main/java/triangle/abstractSyntaxTrees/expressions/IntegerExpression.java

@@ -30,4 +30,14 @@ public class IntegerExpression extends Expression {
 	}
 
 	public final IntegerLiteral IL;
+
+	@Override
+	public boolean isLiteral() {
+		return true;
+	}
+
+	@Override
+	public int getValue() {
+		return IL.getValue();
+	}
 }