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AST Visitor Pattern in Java
Die Roller for command lineSwing MVC and Command PatternLockable linked listGeneration of Groovy source from parent Java classImplementation of the visitor patternUsing the visitor pattern to compose notificationsVisitor that changes the structure of the objects it visitsModular Visitor PatternBuilding a data tree out of a text file C#Visitor design pattern used for an asteroid game
$begingroup$
I am trying to make a simple expression evaluator in Java using Jacc (a parser generator). I am done with the AST creation and now need to create an evaluator. For this I made a simple test to try to understand how visitors work. Here is my code
interface Visitor
public void visitB(B b);
public void visitC(C c);
public void visitD(D d);
class PrintVisitor implements Visitor
public void visitB(B b)
b.child1.accept(this);
b.child2.accept(this);
System.out.println("a B visited: " + b.name);
public void visitC(C c)
c.child.accept(this);
System.out.println("a C visited: " + c.name);
public void visitD(D d)
System.out.println("a D visited: " + d.name);
abstract class A
public String name;
abstract void accept(Visitor v);
class B extends A
public A child1;
public A child2;
public B(String name)
this.name = name;
@Override
void accept(Visitor v)
v.visitB(this);
class C extends A
public A child;
public C(String name)
this.name = name;
@Override
void accept(Visitor v)
v.visitC(this);
class D extends A
public D(String name)
this.name = name;
@Override
void accept(Visitor v)
v.visitD(this);
class Main
public static void main(String[] args)
B b1 = new B("b1");
B b2 = new B("b2");
C c1 = new C("c1");
C c2 = new C("c2");
D d1 = new D("d1");
D d2 = new D("d2");
D d3 = new D("d3");
D d4 = new D("d4");
/*
b1
/
c1 c2
/
b2 d2
/
d3 d4
*/
b1.child1 = c1;
b1.child2 = c2;
c1.child = b2;
c2.child = d2;
b2.child1 = d3;
b2.child2 = d4;
PrintVisitor v = new PrintVisitor();
b1.accept(v);
I would appreciate if you guys commented on my understanding of visitors.
java parsing visitor-pattern
asked 4 mins ago
AnonimistaAnonimista
111
$endgroup$
add a comment |
$begingroup$
I am trying to make a simple expression evaluator in Java using Jacc (a parser generator). I am done with the AST creation and now need to create an evaluator. For this I made a simple test to try to understand how visitors work. Here is my code
interface Visitor
public void visitB(B b);
public void visitC(C c);
public void visitD(D d);
class PrintVisitor implements Visitor
public void visitB(B b)
b.child1.accept(this);
b.child2.accept(this);
System.out.println("a B visited: " + b.name);
public void visitC(C c)
c.child.accept(this);
System.out.println("a C visited: " + c.name);
public void visitD(D d)
System.out.println("a D visited: " + d.name);
abstract class A
public String name;
abstract void accept(Visitor v);
class B extends A
public A child1;
public A child2;
public B(String name)
this.name = name;
@Override
void accept(Visitor v)
v.visitB(this);
class C extends A
public A child;
public C(String name)
this.name = name;
@Override
void accept(Visitor v)
v.visitC(this);
class D extends A
public D(String name)
this.name = name;
@Override
void accept(Visitor v)
v.visitD(this);
class Main
public static void main(String[] args)
B b1 = new B("b1");
B b2 = new B("b2");
C c1 = new C("c1");
C c2 = new C("c2");
D d1 = new D("d1");
D d2 = new D("d2");
D d3 = new D("d3");
D d4 = new D("d4");
/*
b1
/
c1 c2
/
b2 d2
/
d3 d4
*/
b1.child1 = c1;
b1.child2 = c2;
c1.child = b2;
c2.child = d2;
b2.child1 = d3;
b2.child2 = d4;
PrintVisitor v = new PrintVisitor();
b1.accept(v);
I would appreciate if you guys commented on my understanding of visitors.
java parsing visitor-pattern
asked 4 mins ago
AnonimistaAnonimista
111
$endgroup$
add a comment |
$begingroup$
I am trying to make a simple expression evaluator in Java using Jacc (a parser generator). I am done with the AST creation and now need to create an evaluator. For this I made a simple test to try to understand how visitors work. Here is my code
interface Visitor
public void visitB(B b);
public void visitC(C c);
public void visitD(D d);
class PrintVisitor implements Visitor
public void visitB(B b)
b.child1.accept(this);
b.child2.accept(this);
System.out.println("a B visited: " + b.name);
public void visitC(C c)
c.child.accept(this);
System.out.println("a C visited: " + c.name);
public void visitD(D d)
System.out.println("a D visited: " + d.name);
abstract class A
public String name;
abstract void accept(Visitor v);
class B extends A
public A child1;
public A child2;
public B(String name)
this.name = name;
@Override
void accept(Visitor v)
v.visitB(this);
class C extends A
public A child;
public C(String name)
this.name = name;
@Override
void accept(Visitor v)
v.visitC(this);
class D extends A
public D(String name)
this.name = name;
@Override
void accept(Visitor v)
v.visitD(this);
class Main
public static void main(String[] args)
B b1 = new B("b1");
B b2 = new B("b2");
C c1 = new C("c1");
C c2 = new C("c2");
D d1 = new D("d1");
D d2 = new D("d2");
D d3 = new D("d3");
D d4 = new D("d4");
/*
b1
/
c1 c2
/
b2 d2
/
d3 d4
*/
b1.child1 = c1;
b1.child2 = c2;
c1.child = b2;
c2.child = d2;
b2.child1 = d3;
b2.child2 = d4;
PrintVisitor v = new PrintVisitor();
b1.accept(v);
I would appreciate if you guys commented on my understanding of visitors.
java parsing visitor-pattern
asked 4 mins ago
AnonimistaAnonimista
111
$endgroup$
I am trying to make a simple expression evaluator in Java using Jacc (a parser generator). I am done with the AST creation and now need to create an evaluator. For this I made a simple test to try to understand how visitors work. Here is my code
interface Visitor
public void visitB(B b);
public void visitC(C c);
public void visitD(D d);
class PrintVisitor implements Visitor
public void visitB(B b)
b.child1.accept(this);
b.child2.accept(this);
System.out.println("a B visited: " + b.name);
public void visitC(C c)
c.child.accept(this);
System.out.println("a C visited: " + c.name);
public void visitD(D d)
System.out.println("a D visited: " + d.name);
abstract class A
public String name;
abstract void accept(Visitor v);
class B extends A
public A child1;
public A child2;
public B(String name)
this.name = name;
@Override
void accept(Visitor v)
v.visitB(this);
class C extends A
public A child;
public C(String name)
this.name = name;
@Override
void accept(Visitor v)
v.visitC(this);
class D extends A
public D(String name)
this.name = name;
@Override
void accept(Visitor v)
v.visitD(this);
class Main
public static void main(String[] args)
B b1 = new B("b1");
B b2 = new B("b2");
C c1 = new C("c1");
C c2 = new C("c2");
D d1 = new D("d1");
D d2 = new D("d2");
D d3 = new D("d3");
D d4 = new D("d4");
/*
b1
/
c1 c2
/
b2 d2
/
d3 d4
*/
b1.child1 = c1;
b1.child2 = c2;
c1.child = b2;
c2.child = d2;
b2.child1 = d3;
b2.child2 = d4;
PrintVisitor v = new PrintVisitor();
b1.accept(v);
I would appreciate if you guys commented on my understanding of visitors.
java parsing visitor-pattern
java parsing visitor-pattern
asked 4 mins ago
AnonimistaAnonimista
111
asked 4 mins ago
AnonimistaAnonimista
111
asked 4 mins ago
AnonimistaAnonimista
111
asked 4 mins ago
AnonimistaAnonimista
111
asked 4 mins ago
AnonimistaAnonimista
111
111
add a comment |
add a comment |
0
active
oldest
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