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diff --git a/src/util/language.cpp b/src/util/language.cpp
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+/*********************                                                        */
+/*! \file language.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, 2011  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 Definition of input and output languages
+ **
+ ** Definition of input and output languages.
+ **/
+
+#include "util/language.h"
+
+namespace CVC4 {
+namespace language {
+
+InputLanguage toInputLanguage(OutputLanguage language) {
+  switch(language) {
+  case output::LANG_SMTLIB:
+  case output::LANG_SMTLIB_V2:
+  case output::LANG_CVC4:
+    // these entries directly correspond (by design)
+    return InputLanguage(int(language));
+
+  default: {
+    std::stringstream ss;
+    ss << "Cannot map output language `" << language
+       << "' to an input language.";
+    throw CVC4::Exception(ss.str());
+  }
+  }/* switch(language) */
+}/* toInputLanguage() */
+
+OutputLanguage toOutputLanguage(InputLanguage language) {
+  switch(language) {
+  case input::LANG_SMTLIB:
+  case input::LANG_SMTLIB_V2:
+  case input::LANG_CVC4:
+    // these entries directly correspond (by design)
+    return OutputLanguage(int(language));
+
+  default:
+    // Revert to the default (AST) language.
+    //
+    // We used to throw an exception here, but that's not quite right.
+    // We often call this while constructing exceptions, for one, and
+    // it's better to output SOMETHING related to the original
+    // exception rather than mask it with another exception.  Also,
+    // the input language isn't always defined---e.g. during the
+    // initial phase of the main CVC4 driver while it determines which
+    // language is appropriate, and during unit tests.  Also, when
+    // users are writing their own code against the library.
+    return output::LANG_AST;
+  }/* switch(language) */
+}/* toOutputLanguage() */
+
+}/* CVC4::language namespace */
+}/* CVC4 namespace */