Pretty-printer infrastructure created (in src/printer) and SMT-LIBv2 printer

implemented.  This new infrastructure removes support for pretty-printing
(even in the AST language) an Expr with reference count 0.  Previously,
this was supported in a few places internally to the expr package, for
example in NodeBuilder.  (Now, a NodeBuilder cannot be prettyprinted, you
must extract the Node before printing it.)

2 files changed, 79 insertions, 0 deletions

diff --git a/src/printer/smt/smt_printer.cpp b/src/printer/smt/smt_printer.cpp
new file mode 100644
index 000000000..6040c133b
--- /dev/null
+++ b/src/printer/smt/smt_printer.cpp
@@ -0,0 +1,37 @@
+/*********************                                                        */
+/*! \file smt_printer.cpp
+ ** \verbatim
+ ** Original author: mdeters
+ ** Major contributors: none
+ ** Minor contributors (to current version): none
+ ** This file is part of the CVC4 prototype.
+ ** Copyright (c) 2009, 2010  The Analysis of Computer Systems Group (ACSys)
+ ** Courant Institute of Mathematical Sciences
+ ** New York University
+ ** See the file COPYING in the top-level source directory for licensing
+ ** information.\endverbatim
+ **
+ ** \brief The pretty-printer interface for the SMT output language
+ **
+ ** The pretty-printer interface for the SMT output language.
+ **/
+
+#include "printer/smt/smt_printer.h"
+
+#include <iostream>
+
+using namespace std;
+
+namespace CVC4 {
+namespace printer {
+namespace smt {
+
+std::ostream& SmtPrinter::toStream(std::ostream& out, TNode n,
+                                   int toDepth, bool types) const {
+  return out;
+}/* SmtPrinter::toStream() */
+
+}/* CVC4::printer::smt namespace */
+}/* CVC4::printer namespace */
+}/* CVC4 namespace */
+
diff --git a/src/printer/smt/smt_printer.h b/src/printer/smt/smt_printer.h
new file mode 100644
index 000000000..e503ca8f0
--- /dev/null
+++ b/src/printer/smt/smt_printer.h
@@ -0,0 +1,42 @@
+/*********************                                                        */
+/*! \file smt_printer.h
+ ** \verbatim
+ ** Original author: mdeters
+ ** Major contributors: none
+ ** Minor contributors (to current version): none
+ ** This file is part of the CVC4 prototype.
+ ** Copyright (c) 2009, 2010  The Analysis of Computer Systems Group (ACSys)
+ ** Courant Institute of Mathematical Sciences
+ ** New York University
+ ** See the file COPYING in the top-level source directory for licensing
+ ** information.\endverbatim
+ **
+ ** \brief The pretty-printer interface for the SMT output language
+ **
+ ** The pretty-printer interface for the SMT output language.
+ **/
+
+#include "cvc4_private.h"
+
+#ifndef __CVC4__PRINTER__SMT_PRINTER_H
+#define __CVC4__PRINTER__SMT_PRINTER_H
+
+#include <iostream>
+
+#include "printer/printer.h"
+
+namespace CVC4 {
+namespace printer {
+namespace smt {
+
+class SmtPrinter : public CVC4::Printer {
+public:
+  std::ostream& toStream(std::ostream& out, TNode n, int toDepth, bool types) const;
+};/* class SmtPrinter */
+
+}/* CVC4::printer::smt namespace */
+}/* CVC4::printer namespace */
+}/* CVC4 namespace */
+
+#endif /* __CVC4__PRINTER__SMT_PRINTER_H */
+