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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/>.
*/
#pragma once
/// @file symbol_table.h
/// @brief Bidirectional mapping between symbol names and SymbolIds,
/// with kind and sort metadata.
#include "atp/core/types.h"
#include <deque>
#include <string>
#include <string_view>
#include <unordered_map>
namespace atp {
/// Metadata associated with an interned symbol.
struct SymbolInfo {
std::string name;
SymbolKind kind = SymbolKind::kFunction;
uint16_t arity = 0;
SortId sort = kUnsorted; ///< Result sort (for sorted logic)
};
/// Interns symbol names so that each unique string is stored exactly once.
/// Also tracks symbol metadata (kind, arity, sort).
/// Thread-safety: NOT thread-safe (single-threaded prover design).
class SymbolTable {
public:
SymbolTable() = default;
/// Intern a symbol name with metadata. Returns existing ID if already present.
SymbolId intern(std::string_view name, SymbolKind kind, uint16_t arity = 0,
SortId sort = kUnsorted);
/// Look up the name for a given SymbolId. UB if id is out of range.
[[nodiscard]] std::string_view getName(SymbolId id) const;
/// Look up full metadata for a SymbolId.
[[nodiscard]] const SymbolInfo& getInfo(SymbolId id) const;
/// Check if a symbol is a variable.
[[nodiscard]] bool isVariable(SymbolId id) const;
/// Number of interned symbols.
[[nodiscard]] size_t size() const;
private:
// TODO: Phase 1 implementation
std::deque<SymbolInfo> infos_;
std::unordered_map<std::string_view, SymbolId> name_to_id_;
};
} // namespace atp
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