Merge remote-tracking branch 'proofsearch-import/master'

1 files changed, 63 insertions, 0 deletions

diff --git a/proofsearch/src/core/term_bank.cc b/proofsearch/src/core/term_bank.cc
new file mode 100644
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+++ b/proofsearch/src/core/term_bank.cc
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+/*
+ * richard-atp-engine: A saturation-based automated theorem prover for first-order logic.
+ * Copyright (C) 2026 Richard Qin
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "atp/core/term_bank.h"
+
+#include "atp/core/term.h"
+#include "atp/core/types.h"
+
+#include <cassert>
+#include <cstddef>
+#include <span>
+#include <utility>
+#include <vector>
+
+namespace atp {
+
+TermId TermBank::makeTerm(SymbolId symbol, std::span<const TermId> args) {
+    TermKey key{.symbol_ = symbol, .args_ = {args.begin(), args.end()}};
+    auto it = term_to_id_.find(key);
+    if (it != term_to_id_.end()) {
+        return it->second;
+    }
+    auto new_id = static_cast<TermId>(terms_.size());
+    Term new_term{.symbol_id_ = symbol, .args_ = key.args_};
+    terms_.push_back(std::move(new_term));
+    term_to_id_.emplace(std::move(key), new_id);
+    return new_id;
+}
+
+TermId TermBank::makeVar(SymbolId var_symbol) {
+    return makeTerm(var_symbol, {});
+}
+
+const Term& TermBank::getTerm(TermId id) const {
+    assert(id < terms_.size() && "TermId out of bounds!");
+    return terms_[id];
+}
+
+bool TermBank::isVariable(TermId id) const {
+    assert(id < terms_.size() && "TermId out of bounds!");
+    return symbols_->isVariable(terms_[id].symbol_id_);
+}
+
+size_t TermBank::size() const {
+    return terms_.size();
+}
+
+}  // namespace atp