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// Copyright (C) 2019-2021 Aleo Systems Inc.
// This file is part of the Leo library.

// The Leo library 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.

// The Leo library 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 the Leo library. If not, see <https://www.gnu.org/licenses/>.

use crate::{
    AsgContextInner,
    AsgConvertError,
    Circuit,
    Expression,
    Function,
    PartialType,
    Scope,
    Span,
    Statement,
    Variable,
};

/// A node in the abstract semantic graph.
pub trait Node {
    fn span(&self) -> Option<&Span>;
}

pub(super) trait FromAst<'a, T: leo_ast::Node + 'static>: Sized {
    // expected_type contract: if present, output expression must be of type expected_type.
    // type of an element may NEVER be None unless it is functionally a non-expression. (static call targets, function ref call targets are not expressions)
    fn from_ast(
        scope: &'a Scope<'a>,
        value: &T,
        expected_type: Option<PartialType<'a>>,
    ) -> Result<Self, AsgConvertError>;
}

pub enum ArenaNode<'a> {
    Expression(Expression<'a>),
    Scope(Scope<'a>),
    Statement(Statement<'a>),
    Variable(Variable<'a>),
    Circuit(Circuit<'a>),
    Function(Function<'a>),
    Inner(AsgContextInner<'a>),
}