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use fnv::FnvHashMap;
use crate::{Evaluate, Function, Instance, NamedFunction, NamedFunctionID, VariableIDSet};
impl Instance {
/// Get all unique named function names in this instance
///
/// Returns a set of all unique named function names that have at least one named function.
/// Named functions without names are not included.
pub fn named_function_names(&self) -> std::collections::BTreeSet<String> {
self.named_functions
.keys()
.filter_map(|id| self.named_function_labels().name(*id).map(str::to_owned))
.collect()
}
/// Get a named function by name and subscripts
///
/// # Arguments
/// * `name` - The name of the named function to find
/// * `subscripts` - The subscripts of the named function (can be empty)
///
/// # Returns
/// * `Some((NamedFunctionID, &NamedFunction))` if a named function with
/// the given name and subscripts is found
/// * `None` if no matching named function is found
///
/// # Example
/// ```
/// use ommx::Instance;
///
/// let instance = Instance::default();
/// // Find named function with name "x" and no subscripts
/// let nf = instance.get_named_function_by_name("x", vec![]);
/// // Find named function with name "y" and subscripts [1, 2]
/// let nf_indexed = instance.get_named_function_by_name("y", vec![1, 2]);
/// ```
pub fn get_named_function_by_name(
&self,
name: &str,
subscripts: Vec<i64>,
) -> Option<(NamedFunctionID, &NamedFunction)> {
self.named_functions.iter().find_map(|(id, nf)| {
let store = self.named_function_labels();
if store.name(*id) == Some(name) && store.subscripts(*id) == subscripts.as_slice() {
Some((*id, nf))
} else {
None
}
})
}
/// Returns the next available NamedFunctionID.
///
/// Finds the maximum ID from named functions, then adds 1.
/// If there are no named functions, returns NamedFunctionID(0).
///
/// Note: This method does not track which IDs have been allocated.
/// Consecutive calls will return the same ID until a named function is actually added.
pub fn next_named_function_id(&self) -> NamedFunctionID {
self.named_functions
.last_key_value()
.map(|(id, _)| NamedFunctionID::from(id.into_inner() + 1))
.unwrap_or(NamedFunctionID::from(0))
}
pub fn new_named_function(
&mut self,
function: Function,
name: Option<String>,
subscripts: Vec<i64>,
parameters: FnvHashMap<String, String>,
description: Option<String>,
) -> crate::Result<NamedFunctionID> {
let variable_ids: VariableIDSet = self.decision_variables.keys().cloned().collect();
for id in function.required_ids() {
if !variable_ids.contains(&id) {
crate::bail!({ ?id }, "Undefined variable ID is used: {id:?}");
}
}
let id = self.next_named_function_id();
let named_function = NamedFunction { function };
let label = crate::named_function::NamedFunctionLabel {
name,
subscripts,
parameters,
description,
};
self.named_functions.insert(id, named_function, label)?;
Ok(id)
}
}
#[cfg(test)]
mod tests {
use crate::{coeff, linear, Coefficient, Function, Instance, NamedFunctionID};
#[test]
fn test_named_function_names() {
// Instance with named and unnamed functions → names() returns only named, deduplicated
let mut instance = Instance::default();
// Add a decision variable so functions can reference it
instance
.new_named_function(
Function::Constant(Coefficient::try_from(1.0).unwrap()),
Some("alpha".to_string()),
vec![0],
Default::default(),
None,
)
.unwrap();
instance
.new_named_function(
Function::Constant(Coefficient::try_from(2.0).unwrap()),
Some("alpha".to_string()),
vec![1],
Default::default(),
None,
)
.unwrap();
instance
.new_named_function(
Function::Constant(Coefficient::try_from(3.0).unwrap()),
Some("beta".to_string()),
vec![],
Default::default(),
None,
)
.unwrap();
// Unnamed function
instance
.new_named_function(
Function::Constant(Coefficient::try_from(4.0).unwrap()),
None,
vec![],
Default::default(),
None,
)
.unwrap();
let names = instance.named_function_names();
assert_eq!(names.len(), 2);
assert!(names.contains("alpha"));
assert!(names.contains("beta"));
}
#[test]
fn test_get_named_function_by_name() {
let mut instance = Instance::default();
let inserted_id = instance
.new_named_function(
Function::Constant(Coefficient::try_from(1.0).unwrap()),
Some("f".to_string()),
vec![1, 2],
Default::default(),
None,
)
.unwrap();
// Lookup by correct name and subscripts
let found = instance.get_named_function_by_name("f", vec![1, 2]);
assert!(found.is_some());
let (found_id, found) = found.unwrap();
assert_eq!(found_id, inserted_id);
assert_eq!(
found.function,
Function::Constant(Coefficient::try_from(1.0).unwrap())
);
assert_eq!(instance.named_function_labels().name(found_id), Some("f"));
assert_eq!(
instance.named_function_labels().subscripts(found_id),
&[1, 2]
);
// Wrong subscripts → None
let not_found = instance.get_named_function_by_name("f", vec![3]);
assert!(not_found.is_none());
// Wrong name → None
let not_found = instance.get_named_function_by_name("g", vec![1, 2]);
assert!(not_found.is_none());
}
#[test]
fn test_next_named_function_id_empty() {
let instance = Instance::default();
assert_eq!(instance.next_named_function_id(), NamedFunctionID::from(0));
}
#[test]
fn test_next_named_function_id_sparse() {
let mut instance = Instance::default();
// Add function with ID 0 (first call)
instance
.new_named_function(
Function::Constant(Coefficient::try_from(1.0).unwrap()),
None,
vec![],
Default::default(),
None,
)
.unwrap();
// Add function with ID 1 (second call)
instance
.new_named_function(
Function::Constant(Coefficient::try_from(2.0).unwrap()),
None,
vec![],
Default::default(),
None,
)
.unwrap();
// Next ID should be 2
assert_eq!(instance.next_named_function_id(), NamedFunctionID::from(2));
}
#[test]
fn test_new_named_function_success() {
let mut instance = Instance::default();
// Add a decision variable that the function will reference (gets ID 0)
instance.new_continuous();
// Add a named function that references variable 0
let nf_id = instance
.new_named_function(
Function::Linear((coeff!(2.0) * linear!(0)).unwrap()),
Some("obj".to_string()),
vec![0],
Default::default(),
Some("test function".to_string()),
)
.unwrap();
assert!(instance.named_functions().contains_key(&nf_id));
let store = instance.named_function_labels();
assert_eq!(store.name(nf_id), Some("obj"));
assert_eq!(store.subscripts(nf_id), &[0]);
assert_eq!(store.description(nf_id), Some("test function"));
}
#[test]
fn test_new_named_function_undefined_variable() {
let mut instance = Instance::default();
// Try to add a function referencing variable 99 which doesn't exist
let err = instance
.new_named_function(
Function::Linear((coeff!(1.0) * linear!(99)).unwrap()),
Some("bad".to_string()),
vec![],
Default::default(),
None,
)
.unwrap_err();
let msg = err.to_string();
assert!(
msg.contains("Undefined variable ID") && msg.contains("99"),
"unexpected error: {msg}"
);
}
}