// ino.module.WhileStmt.8659.package 
package de.dhbwstuttgart.syntaxtree.statement;
// ino.end
// ino.module.WhileStmt.8659.import 
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Iterator;

import org.apache.bcel.generic.BranchInstruction;
import  org.apache.bcel.generic.ClassGen;
import org.apache.bcel.generic.DUP;
import org.apache.bcel.generic.GOTO;
import org.apache.bcel.generic.IFEQ;
import org.apache.bcel.generic.InstructionList;

import de.dhbwstuttgart.typeinference.Menge;
import de.dhbwstuttgart.bytecode.ClassGenerator;
import de.dhbwstuttgart.logger.Logger;
import de.dhbwstuttgart.syntaxtree.Class;
import de.dhbwstuttgart.syntaxtree.SyntaxTreeNode;
import de.dhbwstuttgart.syntaxtree.operator.LogOp;
import de.dhbwstuttgart.syntaxtree.operator.Operator;
import de.dhbwstuttgart.syntaxtree.operator.RelOp;
import de.dhbwstuttgart.syntaxtree.type.GenericTypeVar;
import de.dhbwstuttgart.syntaxtree.type.RefType;
import de.dhbwstuttgart.syntaxtree.type.Type;
import de.dhbwstuttgart.typeinference.ConstraintsSet;
import de.dhbwstuttgart.typeinference.JavaCodeResult;
import de.dhbwstuttgart.typeinference.Pair;
import de.dhbwstuttgart.typeinference.ResultSet;
import de.dhbwstuttgart.typeinference.TypeinferenceResultSet;
import de.dhbwstuttgart.typeinference.UndConstraint;
import de.dhbwstuttgart.typeinference.assumptions.TypeAssumptions;
import de.dhbwstuttgart.typeinference.exceptions.NotImplementedException;
import de.dhbwstuttgart.typeinference.unify.TypeUnify;




// ino.class.WhileStmt.26326.declaration 
public class WhileStmt extends Statement
// ino.end
// ino.class.WhileStmt.26326.body
{
    // ino.method.WhileStmt.26330.definition 
    public WhileStmt(int offset, int variableLength)
    // ino.end
    // ino.method.WhileStmt.26330.body 
    {
        super(offset,variableLength);
    }
    // ino.end

    // ino.attribute.expr.26333.declaration 
    public Expr expr;
    // ino.end
    // ino.attribute.loop_block.26336.declaration 
    public Statement loop_block;
    // ino.end
    
    // ino.attribute.parserlog.26339.declaration 
    protected static Logger parserlog = Logger.getLogger("parser");
    // ino.end
    
    // ino.method.set_Expr.26342.definition 
    public void set_Expr(Expr exp)
    // ino.end
    // ino.method.set_Expr.26342.body 
    {
    this.expr = exp;
    }
    // ino.end

    // ino.method.set_Loop_block.26345.definition 
    public void set_Loop_block(Statement blk)
    // ino.end
    // ino.method.set_Loop_block.26345.body 
    {
    this.loop_block = blk;
    }
    // ino.end


    // ino.method.toString.26360.defdescription type=javadoc
    /**
     * <br/>Author: Martin Pl�micke
     * @return
     */
    // ino.end
    // ino.method.toString.26360.definition 
    public String toString()
    // ino.end
    // ino.method.toString.26360.body 
    {
        return "WHILE " + loop_block.toString();
    }
    // ino.end
    
    // ino.method.wandleRefTypeAttributes2GenericAttributes.26363.definition 
    public void wandleRefTypeAttributes2GenericAttributes(Menge<Type> paralist, Menge<GenericTypeVar> genericMethodParameters)
    // ino.end
    // ino.method.wandleRefTypeAttributes2GenericAttributes.26363.body 
    {
        if(loop_block!=null){
            loop_block.wandleRefTypeAttributes2GenericAttributes(paralist,genericMethodParameters);
        }
        
    }
    // ino.end
    
	@Override
	public ConstraintsSet TYPEStmt(TypeAssumptions assumptions) {
		ConstraintsSet ret = new ConstraintsSet();
		ret.add(expr.TYPEExpr(assumptions));
		UndConstraint exprMustBeBool = ConstraintsSet.createSingleConstraint(expr.getType().TYPE(assumptions, this), new RefType("Boolean",this, 0).TYPE(assumptions, this)); // while(expr){}; expr <. boolean
		ret.add(exprMustBeBool);
		ret.add(this.loop_block.TYPEStmt(assumptions));
		this.setType(loop_block.getType());
		return ret;
	}

	public int getTypeLineNumber() {
		throw new NotImplementedException();
	}

	@Override
	public JavaCodeResult printJavaCode(ResultSet resultSet) {
		return new JavaCodeResult().attach("while(").attach(this.expr.printJavaCode(resultSet)).attach(")").attach(this.loop_block.printJavaCode(resultSet));
	}

	@Override
	public Menge<SyntaxTreeNode> getChildren() {
		Menge<SyntaxTreeNode> ret = new Menge<SyntaxTreeNode>();
		ret.add(this.expr);
		ret.add(this.loop_block);
		return ret;
	}

	@Override
	public InstructionList genByteCode(ClassGenerator _cg, TypeinferenceResultSet rs) {
		//TOD: while Statement
		InstructionList il = expr.genByteCode(_cg, rs);
		
		BranchInstruction ifeq = new IFEQ(null);
		il.append(ifeq);
		
		il.append(loop_block.genByteCode(_cg, rs));
		
		il.append(new GOTO(il.getStart()));
		
		ifeq.setTarget(il.append(new DUP()));
		
		
		return il;
	}
}
// ino.end