From 242b83ea2d1eec3926ae06e1af1f33a70b4c778d Mon Sep 17 00:00:00 2001
From: Lachnitt <lachnitt@stanford.edu>
Date: Tue, 30 Nov 2021 06:50:54 -0800
Subject: [PATCH] [proofs] Alethe: Printer Specification (#7673)

Header of the Alethe printer

Co-authored-by: Haniel Barbosa <hanielbbarbosa@gmail.com>
---
 src/CMakeLists.txt                |  1 +
 src/proof/alethe/alethe_printer.h | 82 +++++++++++++++++++++++++++++++
 2 files changed, 83 insertions(+)
 create mode 100644 src/proof/alethe/alethe_printer.h

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index e7b968ecc..224af6a09 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -223,6 +223,7 @@ libcvc5_add_sources(
   proof/alethe/alethe_node_converter.h
   proof/alethe/alethe_post_processor.cpp
   proof/alethe/alethe_post_processor.h
+  proof/alethe/alethe_printer.h
   proof/alethe/alethe_proof_rule.cpp
   proof/alethe/alethe_proof_rule.h
   prop/cadical.cpp
diff --git a/src/proof/alethe/alethe_printer.h b/src/proof/alethe/alethe_printer.h
new file mode 100644
index 000000000..22fcb6499
--- /dev/null
+++ b/src/proof/alethe/alethe_printer.h
@@ -0,0 +1,82 @@
+/******************************************************************************
+ * Top contributors (to current version):
+ *   Hanna Lachnitt
+ *
+ * This file is part of the cvc5 project.
+ *
+ * Copyright (c) 2009-2021 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.
+ * ****************************************************************************
+ *
+ * The module for printing Alethe proof nodes
+ */
+
+#include "cvc5_private.h"
+
+#ifndef CVC4__PROOF__ALETHE_PROOF_PRINTER_H
+#define CVC4__PROOF__ALETHE_PROOF_PRINTER_H
+
+#include "proof/proof_node.h"
+
+namespace cvc5 {
+
+namespace proof {
+
+/**
+ * The Alethe printer, which prints proof nodes in a Alethe proof, according to
+ * the proof rules defined in alethe_proof_rule.h.
+ *
+ * It expects to print proof nodes that have processed by the Alethe proof post
+ * processor.
+ */
+class AletheProofPrinter
+{
+ public:
+  AletheProofPrinter();
+  ~AletheProofPrinter() {}
+  /**
+   * This method prints a proof node that has been transformed into the Alethe
+   * proof format
+   *
+   * @param out The stream to write to
+   * @param pfn The proof node to be printed
+   */
+  void print(std::ostream& out, std::shared_ptr<ProofNode> pfn);
+
+ private:
+  /** Used for printing the node after the initial Alethe anchor has been
+   * printed
+   *
+   * The initial anchor introduces the initial assumptions of the problem, which
+   * correspond to the problem assertions.
+   *
+   * @param out The stream to write to
+   * @param pfn The proof node to be printed
+   * @param assumptions The list of assumptions made before the current step,
+   * that are visible as premises to that step
+   * @param steps The list of steps occurring before the current step, that are
+   * visible as premises to that step
+   * @param current_prefix The current prefix which is updated whenever a
+   * subproof is encountered E.g., the prefix "t19.t2." is used when we are
+   * under a subproof started at step "t19" and another at "t2" without leaving
+   * the first subproof.
+   * @param current_step_id The id of a step within a subproof (without the
+   * prefix).
+   * @return The full id (including the prefix) of the last step of pfn.
+   */
+  std::string printInternal(
+      std::ostream& out,
+      std::shared_ptr<ProofNode> pfn,
+      const std::unordered_map<Node, std::string>& assumptions,
+      const std::unordered_map<Node, std::string>& steps,
+      std::string current_prefix,
+      uint32_t& current_step_id);
+};
+
+}  // namespace proof
+
+}  // namespace cvc5
+
+#endif /* CVC4__PROOF__ALETHE_PROOF_PRINTER_H */
-- 
2.30.2