leo_ast/expressions/
ternary.rs

1// Copyright (C) 2019-2025 Provable Inc.
2// This file is part of the Leo library.
3
4// The Leo library is free software: you can redistribute it and/or modify
5// it under the terms of the GNU General Public License as published by
6// the Free Software Foundation, either version 3 of the License, or
7// (at your option) any later version.
8
9// The Leo library is distributed in the hope that it will be useful,
10// but WITHOUT ANY WARRANTY; without even the implied warranty of
11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12// GNU General Public License for more details.
13
14// You should have received a copy of the GNU General Public License
15// along with the Leo library. If not, see <https://www.gnu.org/licenses/>.
16
17use super::*;
18
19/// A ternary conditional expression, that is, `condition ? if_true : if_false`.
20#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
21pub struct TernaryExpression {
22    /// The condition determining which branch to pick.
23    pub condition: Expression,
24    /// The branch the expression evaluates to if `condition` evaluates to true.
25    pub if_true: Expression,
26    /// The branch the expression evaluates to if `condition` evaluates to false.
27    pub if_false: Expression,
28    /// The span from `condition` to `if_false`.
29    pub span: Span,
30    /// The ID of the node.
31    pub id: NodeID,
32}
33
34impl fmt::Display for TernaryExpression {
35    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
36        let maybe_paren = |f: &mut fmt::Formatter, expr: &Expression| {
37            if expr.precedence() > 0 { write!(f, "{expr}") } else { write!(f, "({expr})") }
38        };
39
40        maybe_paren(f, &self.condition)?;
41        write!(f, " ? ")?;
42        maybe_paren(f, &self.if_true)?;
43        write!(f, " : ")?;
44        maybe_paren(f, &self.if_false)
45    }
46}
47
48impl From<TernaryExpression> for Expression {
49    fn from(value: TernaryExpression) -> Self {
50        Expression::Ternary(Box::new(value))
51    }
52}
53
54crate::simple_node_impl!(TernaryExpression);
leo_ast/expressions/ternary.rs

leo_ast/expressions/
ternary.rs
