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|
use crate::buffer::BufferID;
use crate::selection::{Interval, Selection, VectoriseError};
use crate::state::EditorState;
use thiserror::Error;
#[derive(Error, Debug)]
pub enum SFError {
#[error("Could not find buffer {0}")]
BufferNotFound(BufferID),
}
struct SFComponents {
niladic: Box<dyn Fn(&EditorState) -> Result<Selection, SFError>>,
monadic_rank0: Box<dyn Fn(&EditorState, BufferID, usize) -> Result<Selection, SFError>>,
monadic_rank1: Box<dyn Fn(&EditorState, BufferID, &Interval) -> Result<Selection, SFError>>,
dyadic: Option<Box<dyn Fn(&EditorState, &Selection, &Selection) -> Result<Selection, SFError>>>,
}
pub struct SelectionFunction<E> {
niladic: Box<dyn Fn(&EditorState) -> Result<Selection, E>>,
monadic: Box<dyn Fn(&EditorState, &Selection) -> Result<Selection, E>>,
dyadic: Option<Box<dyn Fn(&EditorState, &Selection, &Selection) -> Result<Selection, E>>>,
}
impl From<SFComponents> for SelectionFunction<VectoriseError<SFError>> {
fn from(sfc: SFComponents) -> Self {
let dyadic: Option<Box<dyn Fn(&EditorState, &Selection, &Selection) -> _>> =
if let Some(func) = sfc.dyadic {
Some(Box::new(
move |editor_state: &EditorState, left: &Selection, right: &Selection| {
(func)(editor_state, left, right).map_err(VectoriseError::ProcessingError)
},
))
} else {
None
};
let niladic = Box::new(move |editor_state: &EditorState| {
(sfc.niladic)(editor_state).map_err(VectoriseError::ProcessingError)
});
let monadic = Box::new(Selection::vectorise(sfc.monadic_rank0, sfc.monadic_rank1));
Self {
niladic,
monadic,
dyadic,
}
}
}
impl SelectionFunction<VectoriseError<SFError>> {
pub fn transform_conditional(sf: Self) -> Self {
fn condition(
pred: Result<Selection, VectoriseError<SFError>>,
res: Selection,
) -> Result<Selection, VectoriseError<SFError>> {
match pred {
Ok(mut sel) => Ok(if sel.is_empty() { sel } else { res }),
Err(e) => Err(e),
}
}
let dyadic: Option<Box<dyn Fn(&EditorState, &Selection, &Selection) -> Result<_, _>>> =
if let Some(dyadic) = sf.dyadic {
Some(Box::new(move |es, left, right| {
condition((dyadic)(es, left, right), left.clone())
}))
} else {
None
};
let monadic: Box<dyn Fn(&EditorState, &Selection) -> Result<_, _>> =
Box::new(move |es, left| condition((sf.monadic)(es, left), left.clone()));
SelectionFunction {
niladic: sf.niladic,
monadic,
dyadic,
}
}
// ----------------------------------------------------------------
pub fn empty_sequential() -> Self {
SFComponents {
niladic: Box::new(|_| Ok(Selection::empty())),
monadic_rank0: Box::new(|_, _, _| Ok(Selection::empty())),
monadic_rank1: Box::new(|_, _, _| Ok(Selection::empty())),
dyadic: None,
}
.into()
}
pub fn empy_structural() -> Self {
Self::empty_sequential()
}
pub fn end_sequential() -> Self {
fn get_end_position(es: &EditorState, buffer_id: BufferID) -> Result<Selection, SFError> {
if let Some(buf) = es.get_buffer(buffer_id) {
Ok(Selection::Position {
buffer_id: buffer_id,
pos: buf.max_pos(),
})
} else {
Err(SFError::BufferNotFound(buffer_id))
}
}
SFComponents {
niladic: Box::new(|es| get_end_position(es, es.current_buffer_id)),
monadic_rank0: Box::new(|es, buffer_id, _| get_end_position(es, buffer_id)),
monadic_rank1: Box::new(|es, buffer_id, _| get_end_position(es, buffer_id)),
dyadic: None,
}
.into()
}
pub fn end_structural() -> Self {
SFComponents {
niladic: Box::new(|es| {
if let Some(buf) = es.current_buffer() {
Ok(Selection::Position {
buffer_id: es.current_buffer_id,
pos: buf.max_pos(),
})
} else {
Err(SFError::BufferNotFound(es.current_buffer_id))
}
}),
monadic_rank0: Box::new(|_, buffer_id, pos| Ok(Selection::Position { buffer_id, pos })),
monadic_rank1: Box::new(|_, buffer_id, int| {
Ok(Selection::Position {
buffer_id,
pos: int.end,
})
}),
dyadic: None,
}
.into()
}
}
|
