Collector.java

import visitor.GJDepthFirst;
import syntaxtree.*;

class Collector extends GJDepthFirst<String, String>{

    private Taburu taburu;
    
    public Collector(Taburu symboru){
        this.taburu = symboru;
    }

    /**
     * f0 -> "class"
     * f1 -> Identifier()
     * f2 -> "{"
     * f3 -> "public"
     * f4 -> "static"
     * f5 -> "void"
     * f6 -> "main"
     * f7 -> "("
     * f8 -> "String"
     * f9 -> "["
     * f10 -> "]"
     * f11 -> Identifier()
     * f12 -> ")"
     * f13 -> "{"
     * f14 -> ( VarDeclaration() )*
     * f15 -> ( Statement() )*
     * f16 -> "}"
     * f17 -> "}"
     */
    @Override
    public String visit(MainClass n, String argu) throws Exception {
        String class_name = n.f1.accept(this, null);

        // add main as well
        taburu.collect_class(class_name, null);

        String argument = n.f11.accept(this, null);
        
        // to treat main method in a "special" way
        taburu.collect_method(class_name, "main", "void", "String[] "+ argument);
        n.f14.accept(this, "main:imamethodof:"+ class_name);

        return null;
    }

    /**
     * f0 -> "class"
     * f1 -> Identifier()
     * f2 -> "{"
     * f3 -> ( VarDeclaration() )*
     * f4 -> ( MethodDeclaration() )*
     * f5 -> "}"
     */
    @Override
    public String visit(ClassDeclaration n, String argu) throws Exception {
        String class_name = n.f1.accept(this, null);

        // collect the class
        taburu.collect_class(class_name, null);

        // for VarDeclaration and MethodDeclaration pass the class_name
        super.visit(n, class_name);

        return null;
    }

    /**
     * f0 -> "class"
     * f1 -> Identifier()
     * f2 -> "extends"
     * f3 -> Identifier()
     * f4 -> "{"
     * f5 -> ( VarDeclaration() )*
     * f6 -> ( MethodDeclaration() )*
     * f7 -> "}"
     */
    @Override
    public String visit(ClassExtendsDeclaration n, String argu) throws Exception {
        String class_name = n.f1.accept(this, null);
        String mama_name = n.f3.accept(this, null);

        taburu.collect_class(class_name, mama_name);

        super.visit(n, class_name);

        return null;
    }

    /**
     * f0 -> "public"
     * f1 -> Type()
     * f2 -> Identifier()
     * f3 -> "("
     * f4 -> ( FormalParameterList() )?
     * f5 -> ")"
     * f6 -> "{"
     * f7 -> ( VarDeclaration() )*
     * f8 -> ( Statement() )*
     * f9 -> "return"
     * f10 -> Expression()
     * f11 -> ";"
     * f12 -> "}"
     */
    @Override
    public String visit(MethodDeclaration n, String argu) throws Exception {
        String argument_list = n.f4.present() ? n.f4.accept(this, null) : "";
        String my_type = n.f1.accept(this, null);
        String my_name = n.f2.accept(this, null);

        // argu has the class name. deal with argument list in the function
        taburu.collect_method(argu, my_name, my_type, argument_list);

        // to gather the var decls
        n.f7.accept(this, my_name + ":imamethodof:"+ argu);

        return null;
    }

    /**
     * f0 -> Type()
     * f1 -> Identifier()
     * f2 -> ";"
     */
    @Override
    public String visit(VarDeclaration n, String argu) throws Exception {
        String my_type = n.f0.accept(this, null);
        String my_name = n.f1.accept(this, null);

        // pass argu to handle the scope
        taburu.collect_variable(my_name, my_type , argu);

        return null;
    }

    /**
     * f0 -> FormalParameter()
     * f1 -> FormalParameterTail()
     */
    @Override
    public String visit(FormalParameterList n, String argu) throws Exception {
        String ret = n.f0.accept(this, null);

        if (n.f1 != null) {
            ret += n.f1.accept(this, null);
        }

        return ret;
    }

    /**
     * f0 -> FormalParameter()
     * f1 -> FormalParameterTail()
     */
    public String visit(FormalParameterTerm n, String argu) throws Exception {
        return n.f1.accept(this, argu);
    }

    /**
     * f0 -> ","
     * f1 -> FormalParameter()
     */
    @Override
    public String visit(FormalParameterTail n, String argu) throws Exception {
        String ret = "";
        for ( Node node: n.f0.nodes) {
            ret += ", " + node.accept(this, null);
        }

        return ret;
    }

    /**
     * f0 -> Type()
     * f1 -> Identifier()
     */
    @Override
    public String visit(FormalParameter n, String argu) throws Exception{
        String type = n.f0.accept(this, null);
        String name = n.f1.accept(this, null);
        return type + " " + name;
    }

    /**
     * f0 -> BooleanArrayType()
     *       | IntegerArrayType()
     */
    public String visit(ArrayType n, String argu) throws Exception {
        return n.f0.accept(this, argu);
    }

    public String visit(BooleanArrayType n, String argu) {
        return "boolean[]";
    }

    public String visit(IntegerArrayType n, String argu) {
        return "int[]";
    }


    public String visit(BooleanType n, String argu) {
        return "boolean";
    }

    public String visit(IntegerType n, String argu) {
        return "int";
    }

    @Override
    public String visit(Identifier n, String argu) {
        return n.f0.toString();
    }

}