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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 tptp_parser.h
/// @brief TPTP format parser — converts .p files to internal representations.
///
/// The parser interns all symbols (predicates, functions, variables) into the
/// SymbolTable and builds terms in the TermBank during parsing. This is the
/// E Prover approach: parse and intern simultaneously, avoiding a separate
/// resolution pass.
///
/// V1: Hand-written recursive descent for TPTP CNF/FOF subset.
/// (ANTLR4 integration deferred — avoids build complexity for V1.)
#include "atp/core/clause.h"
#include "atp/core/symbol_table.h"
#include "atp/core/term_bank.h"
#include "atp/normalize/formula.h"
#include <string>
#include <vector>
namespace atp {
/// Role of a TPTP formula.
/// See TPTP spec: https://www.tptp.org/TPTP/SyntaxBNF.html
enum class FormulaRole : uint8_t {
kAxiom, ///< Background truth
kHypothesis, ///< Problem-specific assumption
kDefinition, ///< Symbol definition (can be unfolded)
kAssumption, ///< Assumed for this proof attempt
kLemma, ///< Derived intermediate result
kTheorem, ///< Previously proved statement (used as axiom)
kConjecture, ///< The statement to prove
kNegatedConjecture, ///< Already negated conjecture (input was cnf)
kPlain, ///< No semantic role specified
};
/// Map a TPTP role string to enum. Returns kPlain for unknown roles.
FormulaRole parseRole(std::string_view role_str);
/// A parsed TPTP formula with its name and role.
struct AnnotatedFormula {
std::string name_; ///< Formula name (e.g., "axiom1")
FormulaRole role_ = FormulaRole::kPlain; ///< Semantic role
std::unique_ptr<Formula> formula_; ///< The FOL formula (for fof(...))
std::vector<Clause> clauses_; ///< Direct clauses (for cnf(...))
bool is_cnf_ = false; ///< true if input was cnf(), false if fof()
};
/// A complete parsed TPTP problem.
struct ParsedProblem {
std::vector<AnnotatedFormula> formulas_;
/// Does any formula contain an equality predicate?
bool has_equality_ = false;
/// Original file path (for error messages).
std::string source_file_;
};
/// Parse a TPTP file.
///
/// For `cnf(...)` entries: clauses are built directly (no clausification needed).
/// For `fof(...)` entries: Formula AST is built (clausification happens later).
///
/// All symbols are interned into `symbols` and terms into `bank` during parsing.
ParsedProblem parseTptpFile(const std::string& filename, TermBank& bank, SymbolTable& symbols);
/// Parse a TPTP string (for testing).
ParsedProblem parseTptpString(const std::string& input, TermBank& bank, SymbolTable& symbols);
/// Prepare a parsed problem for proving:
/// 1. Negate conjecture formulas.
/// 2. Clausify all fof() formulas.
/// 3. Collect all cnf() clauses directly.
/// 4. Assign ClauseIds and set provenance to kInput.
///
/// Returns the final clause set ready for the Prover.
std::vector<Clause> prepareForProving(ParsedProblem& problem, TermBank& bank, SymbolTable& symbols);
} // namespace atp
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