Make quantifiers-preprocess preprocessing pass (#2322)

1 files changed, 57 insertions, 0 deletions

diff --git a/src/preprocessing/passes/quantifiers_preprocess.cpp b/src/preprocessing/passes/quantifiers_preprocess.cpp
new file mode 100644
index 000000000..e6c1557c0
--- /dev/null
+++ b/src/preprocessing/passes/quantifiers_preprocess.cpp
@@ -0,0 +1,57 @@
+/*********************                                                        */
+/*! \file quantifiers_preprocess.cpp
+ ** \verbatim
+ ** Top contributors (to current version):
+ **   Caleb Donovick
+ ** This file is part of the CVC4 project.
+ ** Copyright (c) 2009-2018 by the authors listed in the file AUTHORS
+ ** in the top-level source directory) and their institutional affiliations.
+ ** All rights reserved.  See the file COPYING in the top-level source
+ ** directory for licensing information.\endverbatim
+ **
+ ** \brief Remove rewrite rules, apply pre-skolemization to existential
+ *quantifiers
+ **
+ **
+ ** Calls the quantifier rewriter, removing rewrite rules and applying
+ ** pre-skolemization to existential quantifiers
+ **/
+
+#include "preprocessing/passes/quantifiers_preprocess.h"
+
+#include "base/output.h"
+#include "theory/quantifiers/quantifiers_rewriter.h"
+#include "theory/rewriter.h"
+
+namespace CVC4 {
+namespace preprocessing {
+namespace passes {
+
+using namespace CVC4::theory;
+
+QuantifiersPreprocess::QuantifiersPreprocess(PreprocessingPassContext* preprocContext)
+    : PreprocessingPass(preprocContext, "quantifiers-preprocess"){};
+
+PreprocessingPassResult QuantifiersPreprocess::applyInternal(
+    AssertionPipeline* assertionsToPreprocess)
+{
+  size_t size = assertionsToPreprocess->size();
+  for (size_t i = 0; i < size; ++i)
+  {
+    Node prev = (*assertionsToPreprocess)[i];
+    Node next = quantifiers::QuantifiersRewriter::preprocess(prev);
+    if (next != prev)
+    {
+      assertionsToPreprocess->replace(i, Rewriter::rewrite(next));
+      Trace("quantifiers-preprocess") << "*** Pre-skolemize " << prev << endl;
+      Trace("quantifiers-preprocess")
+          << "   ...got " << (*assertionsToPreprocess)[i] << endl;
+    }
+  }
+
+  return PreprocessingPassResult::NO_CONFLICT;
+}
+
+}  // namespace passes
+}  // namespace preprocessing
+}  // namespace CVC4