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use crate::{
expression::{BuiltinSelectionFn, ResultTransform, SearchModifier},
selection::Selection,
selection_functions::{
function_character::selection_function_character,
function_end::selection_function_end,
result_transformation::{complement_transform, conditional_transform},
types::SFArguments,
},
state::EditorState,
};
mod function_character;
mod function_empty;
mod function_end;
mod result_transformation;
mod types;
pub use crate::selection_functions::types::{SFError, SFResult};
pub fn evaluate_selection_function(
es: &EditorState,
sf: BuiltinSelectionFn,
search_mod: Option<SearchModifier>,
result_transform: Option<ResultTransform>,
left: Option<Selection>,
right: Option<Selection>,
) -> SFResult {
let sf_args = match (left, right) {
(None, None) => Ok(SFArguments::Niladic { es }),
(Some(left), None) => Ok(SFArguments::Monadic { es, left }),
(Some(left), Some(right)) => Ok(SFArguments::Dyadic { es, left, right }),
_ => Err(SFError::NoLeftArgument),
}?;
let res = match sf {
BuiltinSelectionFn::CharOffset(off) => {
selection_function_character(off, &sf_args, search_mod)
}
BuiltinSelectionFn::EndOfBuffer => selection_function_end((), &sf_args, search_mod),
x => Err(SFError::NotImplemented(x).into()),
}?;
if let Some(result_transform) = result_transform {
match result_transform {
ResultTransform::Complement => complement_transform(es, res),
ResultTransform::Conditional => conditional_transform(res, &sf_args),
ResultTransform::ConditionalComplement => {
let res = complement_transform(es, res)?;
conditional_transform(res, &sf_args)
}
ResultTransform::ComplementConditional => {
let res = conditional_transform(res, &sf_args)?;
complement_transform(es, res)
}
}
} else {
Ok(res)
}
}
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