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use crate::{
expression::{Composite, HookKind},
selection::{Selection, SelectionError, VectoriseError},
selection_functions::{evaluate_selection_function, SFError},
state::{EditorState, GroupedChangeError, StateChange, StateResult},
text::Text,
};
use thiserror::Error;
#[derive(Error, Debug)]
pub enum EvaluationError {
#[error("{0}")]
SelectionFunctionError(VectoriseError<SFError>),
#[error("{0}")]
SelectionUnionError(SelectionError),
#[error("Error in processing group {0}")]
GroupError(GroupedChangeError),
#[error("Invalid right-only application")]
IROApplication,
#[error("Not yet implemented {0}")]
UnimplementedError(&'static str),
#[error("Hook used in niladic context")]
NiladicRightHook,
#[error("Text argument provided to a selection function")]
TextArgument,
}
// Helper functions
// Absolutely crazy that in 2026 Rust doesn't have a built-in Either type OR
// (even better) a way to do anonymous sum types! Of course it has anonymous
// product types, but big Cartesian doesn't want you to have +
#[derive(Clone)]
enum Either<L, R> {
L(L),
R(R),
}
fn ensure_selection(
left: Option<Either<Selection, Text>>,
) -> Result<Option<Selection>, EvaluationError> {
match left {
Some(Either::L(left)) => Ok(Some(left)),
None => Ok(None),
_ => Err(EvaluationError::TextArgument),
}
}
fn commit_if_needed(
es: &mut EditorState,
changes: Vec<StateChange>,
commit: bool,
) -> Vec<StateChange> {
if commit {
es.commit_changes(changes);
Vec::new()
} else {
changes
}
}
fn _eval(
es: &mut EditorState,
comp: Composite,
left: Option<Either<Selection, Text>>,
right: Option<Selection>,
commit: bool,
) -> Result<StateResult, EvaluationError> {
if left.is_none() && right.is_some() {
return Err(EvaluationError::IROApplication);
};
match comp {
Composite::SelectionFunction {
func,
search_mod,
result_transform,
} => {
let left: Option<Selection> = ensure_selection(left)?;
let sel =
evaluate_selection_function(es, func, search_mod, result_transform, left, right)
.map_err(EvaluationError::SelectionFunctionError)?;
Ok((sel, Vec::new()))
}
Composite::TextFunction { func, swapped } => {
Err(EvaluationError::UnimplementedError("text function"))
}
Composite::Hook { kind, f, g } => match kind {
HookKind::Before => {
let (f_result, mut changes) = _eval(es, *f, left.clone(), None, commit)?;
changes = commit_if_needed(es, changes, commit);
let right = if right.is_some() {
Ok(right)
} else {
ensure_selection(left)
}?;
let (sel, g_changes) = _eval(es, *g, Either::L(f_result).into(), right, commit)?;
let more_changes = commit_if_needed(es, g_changes, commit);
changes.extend(more_changes);
Ok((sel, changes))
}
HookKind::After => {
if left.is_none() {
return Err(EvaluationError::NiladicRightHook);
}
let combi_left = match right {
Some(right) => Some(Either::L(right)),
None => left.clone(),
};
let (g_result, mut changes) = _eval(es, *g, combi_left, None, commit)?;
changes = commit_if_needed(es, changes, commit);
let (sel, f_changes) = _eval(es, *f, left.clone(), Some(g_result), commit)?;
let more_changes = commit_if_needed(es, f_changes, commit);
changes.extend(more_changes);
Ok((sel, changes))
}
},
Composite::Train2 { f, g } => {
let (left, mut f_changes) = _eval(es, *f, left, right, commit)?;
f_changes = commit_if_needed(es, f_changes, commit);
let (sel, g_changes) = _eval(es, *g, Some(Either::L(left)), None, commit)?;
let more_changes = commit_if_needed(es, g_changes, commit);
f_changes.extend(more_changes);
Ok((sel, f_changes))
}
Composite::Train3 { f, g, h } => {
let (f_left, mut f_changes) = _eval(es, *f, left.clone(), right.clone(), commit)?;
f_changes = commit_if_needed(es, f_changes, commit);
let (g_right, h_changes) = _eval(es, *h, left, right, commit)?;
let h_changes = commit_if_needed(es, h_changes, commit);
let (sel, g_changes) = _eval(es, *g, Some(Either::L(f_left)), Some(g_right), commit)?;
let g_changes = commit_if_needed(es, g_changes, commit);
f_changes.extend(h_changes);
f_changes.extend(g_changes);
Ok((sel, f_changes))
}
Composite::Group { operations } => {
let results: Vec<(Selection, Vec<StateChange>)> = operations
.into_iter()
.map(|op| _eval(es, op, left.clone(), right.clone(), commit))
.collect::<Result<_, _>>()?;
let (selections, arms) = results.into_iter().unzip();
let states = if commit {
es.commit_changes_grouped(arms).map(|_| Vec::new())
} else {
es.validate_grouped_changes(&arms)
.map(|_| arms.into_iter().flatten().collect())
}
.map_err(EvaluationError::GroupError)?;
let sel = Selection::union(selections).map_err(EvaluationError::SelectionUnionError)?;
Ok((sel, states))
}
}
}
pub fn evaluate(es: &mut EditorState, comp: Composite) -> Result<Selection, EvaluationError> {
let (sel, changes) = _eval(es, comp, None, None, true)?;
es.commit_changes(changes);
Ok(sel)
}
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