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        if self.condition.precedence() > 14 {
37            write!(f, "{}", self.condition)?;
38        } else {
39            write!(f, "({})", self.condition)?;
40        }
41
42        write!(f, " ? {} : ", self.if_true)?;
43
44        if self.if_false.precedence() > 14 {
45            write!(f, "{}", self.if_false)?;
46        } else {
47            write!(f, "({})", self.if_false)?;
48        }
49
50        Ok(())
51    }
52}
53
54impl From<TernaryExpression> for Expression {
55    fn from(value: TernaryExpression) -> Self {
56        Expression::Ternary(Box::new(value))
57    }
58}
59
60crate::simple_node_impl!(TernaryExpression);
leo_ast/expressions/ternary.rs

leo_ast/expressions/
ternary.rs
