// Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef FORTRAN_SEMANTICS_EXPRESSION_H_
#define FORTRAN_SEMANTICS_EXPRESSION_H_

#include "../evaluate/expression.h"
#include "../evaluate/type.h"
#include "../parser/parse-tree.h"
#include <optional>

namespace Fortran::semantics {

using MaybeExpr = std::optional<evaluate::Expr<evaluate::SomeType>>;

struct IntrinsicTypeDefaultKinds {
  int defaultIntegerKind{evaluate::DefaultInteger::kind};
  int defaultRealKind{evaluate::DefaultReal::kind};
  int defaultDoublePrecisionKind{evaluate::DefaultDoublePrecision::kind};
  int defaultQuadPrecisionKind{evaluate::DefaultDoublePrecision::kind};
  int defaultCharacterKind{evaluate::DefaultCharacter::kind};
  int defaultLogicalKind{evaluate::DefaultLogical::kind};
};

// Semantic analysis of one expression.
std::optional<evaluate::Expr<evaluate::SomeType>> AnalyzeExpr(
    evaluate::FoldingContext &, const IntrinsicTypeDefaultKinds &,
    const parser::Expr &);

// Semantic analysis of all expressions in a parse tree, which is
// decorated with typed representations for top-level expressions.
void AnalyzeExpressions(parser::Program &, evaluate::FoldingContext &,
    const IntrinsicTypeDefaultKinds &);

}  // namespace Fortran::semantics
#endif  // FORTRAN_SEMANTICS_EXPRESSION_H_