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package minijava.symboltable;
import minijava.typecheck.PrintError;
public class MPrimaryExpr extends MType {
/**
* f0 -> IntegerLiteral()
* | TrueLiteral()
* | FalseLiteral()
* | Identifier()
* | ThisExpression()
* | ArrayAllocationExpression()
* | AllocationExpression()
* | NotExpression()
* | BracketExpression()
*/
public enum E_type {
Int, True, False, Id, This, ArrayAlloc, Alloc, Not, Braket;
}
public E_type e_type;
public int i_val; // int
public MIdentifier e_id = null; // Id, ArrayAlloc, Alloc
public MExpression e_exp = null; // ArrayAlloc, Not, Braket
public int toInt() {
return i_val;
}
public boolean toBool() {
if (e_type==E_type.True) {
return true;
} else if (e_type==E_type.False) {
return false;
} else {
throw new IllegalArgumentException("invalid call to toBool()");
}
}
public String primExprType(MMethod m) {
switch (e_type) {
case Int:
return MIdentifier.intType;
case Alloc:
return e_id.getName();
case ArrayAlloc:
if (e_exp.exprType(m)!=MIdentifier.intType) {
PrintError.print(getLine(), getColumn(), "wrong type of expression in array alloc");
return null;
}
return MIdentifier.arrType;
case Braket:
return e_exp.exprType(m);
case True:
case False:
return MIdentifier.boolType;
case Id:
MVariable m_var = m.findVarByName(e_id.name);
if (m_var!=null) {
return m_var.typename;
} else {
return null;
}
case Not:
if (e_exp.exprType(m)==MIdentifier.boolType) {
return MIdentifier.boolType;
} else {
PrintError.print(getLine(), getColumn(), "A non boolean expr after '!' operator");
return null;
}
case This:
return m.method_class.name;
default:
return null;
}
}
public void printPrimExpr(int spaces) {
System.err.print(OutputFormat.spaces(spaces));
switch (e_type) {
case Int:
System.err.print(i_val);
break;
case True:
case False:
System.err.print(this.toBool());
break;
case Id:
System.err.print(e_id.getName());
break;
case Alloc:
System.err.print("new "+e_id.getName()+"()");
break;
case ArrayAlloc:
System.err.print("new int[");
e_exp.printExpr(0);
System.err.print("]");
break;
}
}
}
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