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use super::Receivers;
use std::string::String;
impl Receivers {
/// Converts the receivers to their DBC file string representation.
///
/// Per DBC spec Section 9.5:
/// ```bnf
/// receivers = receiver {',' receiver} ;
/// receiver = node_name | 'Vector__XXX' ;
/// ```
///
/// - Specific nodes are comma-separated
/// - Empty or None receivers serialize as `Vector__XXX`
///
/// # Examples
///
/// ```rust
/// use dbc_rs::{ReceiversBuilder, Receivers};
///
/// // No receivers -> Vector__XXX
/// let none = ReceiversBuilder::new().none().build().unwrap();
/// assert_eq!(none.to_dbc_string(), "Vector__XXX");
///
/// // Single receiver
/// let single = ReceiversBuilder::new().add_node("TCM").build().unwrap();
/// assert_eq!(single.to_dbc_string(), "TCM");
///
/// // Multiple receivers -> comma-separated
/// let multi = ReceiversBuilder::new().add_node("TCM").add_node("BCM").build().unwrap();
/// assert_eq!(multi.to_dbc_string(), "TCM,BCM");
/// ```
#[must_use = "return value should be used"]
pub fn to_dbc_string(&self) -> String {
match self {
Receivers::Nodes(nodes) if nodes.is_empty() => crate::VECTOR_XXX.to_string(),
Receivers::Nodes(nodes) => {
let mut result = String::with_capacity(nodes.len() * 10);
for (i, node) in nodes.iter().enumerate() {
if i > 0 {
result.push(',');
}
result.push_str(node.as_str());
}
result
}
Receivers::None => crate::VECTOR_XXX.to_string(),
}
}
}
#[cfg(test)]
mod tests {
use crate::ReceiversBuilder;
#[test]
fn test_receivers_to_dbc_string_none() {
let receivers = ReceiversBuilder::new().none().build().unwrap();
assert_eq!(receivers.to_dbc_string(), "Vector__XXX");
}
#[test]
fn test_receivers_to_dbc_string_single() {
let receivers = ReceiversBuilder::new().add_node("TCM").build().unwrap();
assert_eq!(receivers.to_dbc_string(), "TCM");
}
#[test]
fn test_receivers_to_dbc_string_multiple() {
let receivers = ReceiversBuilder::new().add_node("TCM").add_node("BCM").build().unwrap();
assert_eq!(receivers.to_dbc_string(), "TCM,BCM");
}
#[test]
fn test_receivers_to_dbc_string_empty_nodes() {
// Edge case: Nodes variant with empty list
let receivers = ReceiversBuilder::new().build().unwrap();
assert_eq!(receivers.to_dbc_string(), "Vector__XXX");
}
}