leo_ast/statement/
conditional.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 crate::{Block, Expression, Indent, Node, NodeID, Statement};
18use leo_span::Span;
19
20use serde::{Deserialize, Serialize};
21use std::fmt;
22
23/// An `if condition block (else next)?` statement.
24#[derive(Clone, PartialEq, Eq, Serialize, Deserialize, Debug)]
25pub struct ConditionalStatement {
26    /// The `bool`-typed condition deciding what to evaluate.
27    pub condition: Expression,
28    /// The block to evaluate in case `condition` yields `true`.
29    pub then: Block,
30    /// The statement, if any, to evaluate when `condition` yields `false`.
31    pub otherwise: Option<Box<Statement>>,
32    /// The span from `if` to `next` or to `block`.
33    pub span: Span,
34    /// The ID of the node.
35    pub id: NodeID,
36}
37
38impl fmt::Display for ConditionalStatement {
39    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
40        writeln!(f, "if {} {{", self.condition)?;
41        for stmt in self.then.statements.iter() {
42            writeln!(f, "{}{}", Indent(stmt), stmt.semicolon())?;
43        }
44        match self.otherwise.as_deref() {
45            None => write!(f, "}}")?,
46            Some(Statement::Block(block)) => {
47                writeln!(f, "}} else {{")?;
48                for stmt in block.statements.iter() {
49                    writeln!(f, "{}{}", Indent(stmt), stmt.semicolon())?;
50                }
51                write!(f, "}}")?;
52            }
53            Some(Statement::Conditional(cond)) => {
54                write!(f, "}} else {cond}")?;
55            }
56            Some(_) => panic!("`otherwise` of a `ConditionalStatement` must be a block or conditional."),
57        }
58        Ok(())
59    }
60}
61
62impl From<ConditionalStatement> for Statement {
63    fn from(value: ConditionalStatement) -> Self {
64        Statement::Conditional(value)
65    }
66}
67
68crate::simple_node_impl!(ConditionalStatement);
leo_ast/statement/conditional.rs

leo_ast/statement/
conditional.rs
