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// Copyright (C) 2025 Free Software Foundation, Inc.
// This file is part of GCC.
// GCC 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, or (at your option) any later
// version.
// GCC 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 GCC; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
#ifndef RUST_DERIVE_CMP_COMMON_H
#define RUST_DERIVE_CMP_COMMON_H
#include "rust-ast.h"
#include "rust-ast-builder.h"
#include "rust-item.h"
#include "rust-path.h"
namespace Rust {
namespace AST {
/**
* A pair of two expressions from each instance being compared. E.g. this
* could be `self.0` and `other.0`, or `self.field` and `other.field`
*/
struct SelfOther
{
std::unique_ptr<Expr> self_expr;
std::unique_ptr<Expr> other_expr;
/* Create a <self.i> and an <other.i> expression */
static SelfOther index (Builder builder, int idx);
static std::vector<SelfOther> indexes (Builder builder,
const std::vector<TupleField> &fields);
/* Create a <self.field> and an <other.field> expression */
static SelfOther field (Builder builder, const std::string &field_name);
static std::vector<SelfOther> fields (Builder builder,
const std::vector<StructField> &fields);
};
/**
* Builder for common match cases used when comparing two enum instances. This
* builder takes care of creating the unique patterns for the `self` instance
* and `other` instance, as well as the entire `MatchCase` required for building
* a proper comparision expression for an implementation of a comparision trait
* for an enum type. The functions take a lambda to use when creating the
* expression of the generated `MatchCase`.
*/
class EnumMatchBuilder
{
public:
/**
* The type of functions to call when creating the resulting expression in the
* generated `MatchCase`
*/
using ExprFn
= std::function<std::unique_ptr<Expr> (std::vector<SelfOther> &&)>;
EnumMatchBuilder (const std::string &enum_path,
const std::string &variant_path, ExprFn fn,
Builder &builder)
: enum_path (enum_path), variant_path (variant_path), fn (fn),
builder (builder)
{}
/**
* Generate a `MatchCase` for an enum tuple variant
*
* (&Enum::Tuple(self0, self1), &Enum::Tuple(other0, other1)) => <fn>
*/
MatchCase tuple (EnumItem &variant);
/**
* Generate a `MatchCase` for an enum struct variant
*
* (&Enum::Struct { a: self_a }, &Enum::Struct { a: other_a }) => <fn>
*/
MatchCase strukt (EnumItem &variant);
private:
const std::string &enum_path;
const std::string &variant_path;
ExprFn fn;
Builder &builder;
};
} // namespace AST
} // namespace Rust
#endif // ! RUST_DERIVE_CMP_COMMON_H
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