public static string PrintExpr(AstExpr astRoot)
{
switch (astRoot.m_exprk)
{
case EXPRK.Binary:
{
AstBinaryExpr expr = (AstBinaryExpr)astRoot;
return("( " + expr.m_tokenkOp.ToString() + " " + PrintExpr(expr.m_leftExpr) + " " + PrintExpr(expr.m_rightExpr) + " )");
} break;
case EXPRK.Group:
{
AstGroupExpr group = (AstGroupExpr)astRoot;
return("( " + PrintExpr(group.m_expr) + " )");
} break;
case EXPRK.Literal:
{
AstLiteralExpr expr = (AstLiteralExpr)astRoot;
return(expr.m_value.ToString());
} break;
case EXPRK.Unary:
{
AstUnaryExpr expr = (AstUnaryExpr)astRoot;
return("( " + expr.m_tokenkOp.ToString() + " " + PrintExpr(expr.m_expr) + " )");
} break;
default:
{
Debug.Fail("Print not implemented for Ast Node type: " + astRoot.m_astnodek);
return("<error>");
} break;
}
}
protected object EvaluateLiteralExpr(AstLiteralExpr expr)
{
if (HadErrorOrReturn())
{
return(null);
}
return(expr.m_value);
}
