Typecheck.java


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import java.io.*;
import visitor.*;
import parse.*;
import syntaxtree.*;
import java.util.*;
import st.*;
import misc.*;
import typecheck.library.*;

public class Typecheck {
    public static void main(String[] args) {
        Node root = null;
        try {
            root = new MiniJavaParser(System.in).Goal();

            // Pretty-print the tree. PPrinter inherits from
            // GJDepthFirst<R,A>. R=Void, A=String.
            PPrinter<Void,String> pp = new PPrinter<Void,String>();
            root.accept(pp, "");
            MinimalLogger.info("===================================================");

            // Build the symbol table. Top-down visitor, inherits from
            // GJDepthFirst<R,A>. R=Void, A=Integer.
            SymbolTable symt = new SymbolTable();
            root.accept(new SymTableBottomUp<Void>(), symt);
            root.accept(new SymTableTopDown<Void>(), symt);
            MinimalLogger.info("===================================================");

            TypeCheckSimp ts = new TypeCheckSimp();
            TypeInstance res = root.accept(ts, symt);

            // Ugly code not to be inspired from: "my" way of storing
            // type info / typecheck property: if some of my internal
            // structure is empty, then things don't typecheck for
            // me. This is specific to my own implementation.
            // if (res != null && res.type_array.size() > 0)
            if (res.getType() != TypeEnum.ERROR)
                System.out.println("Program type checked successfully");
            else
                System.out.println("Type error");
        }
        catch (ParseException e) {
            System.out.println(e.toString());
            System.exit(1);
        }

    }
}