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|
use crate::{
buffer::BufferID,
expression::SearchModifier,
selection::{Interval, Selection},
selection_functions::types::{
SelectionFunction, SelectionFunctionError, UnparameterisedSelectionFunction, get_buffer,
},
state::EditorState,
};
pub struct End;
impl UnparameterisedSelectionFunction for End {
const NAME: &'static str = "end";
fn niladic(&self, es: &EditorState) -> Result<Selection, SelectionFunctionError> {
let buf = get_buffer(es, es.current_buffer_id)?;
Ok(Selection::Scalar {
buffer_id: es.current_buffer_id,
pos: buf.max_pos(),
})
}
fn monadic_rank0(
&self,
_es: &EditorState,
buffer_id: BufferID,
pos: usize,
) -> Result<Selection, SelectionFunctionError> {
Ok(Selection::Scalar { buffer_id, pos })
}
fn monadic_rank1(
&self,
_es: &EditorState,
buffer_id: BufferID,
interval: &Interval,
) -> Result<Selection, SelectionFunctionError> {
Ok(Selection::Scalar {
buffer_id,
pos: interval.end,
})
}
}
pub struct ReverseEnd;
impl UnparameterisedSelectionFunction for ReverseEnd {
const NAME: &'static str = "reverse_end";
fn niladic(&self, es: &EditorState) -> Result<Selection, SelectionFunctionError> {
Ok(Selection::Scalar {
buffer_id: es.current_buffer_id,
pos: 0,
})
}
fn monadic_rank0(
&self,
_es: &EditorState,
buffer_id: BufferID,
pos: usize,
) -> Result<Selection, SelectionFunctionError> {
Ok(Selection::Scalar { buffer_id, pos })
}
fn monadic_rank1(
&self,
_es: &EditorState,
buffer_id: BufferID,
interval: &Interval,
) -> Result<Selection, SelectionFunctionError> {
Ok(Selection::Scalar {
buffer_id,
pos: interval.start,
})
}
}
pub struct SequentialEnd;
impl UnparameterisedSelectionFunction for SequentialEnd {
const NAME: &'static str = "sequential_end";
fn niladic(&self, _es: &EditorState) -> Result<Selection, SelectionFunctionError> {
Err(SelectionFunctionError::NoNiladicForm(";$"))
}
fn monadic_rank0(
&self,
es: &EditorState,
buffer_id: BufferID,
_pos: usize,
) -> Result<Selection, SelectionFunctionError> {
let buf = get_buffer(es, buffer_id)?;
Ok(Selection::Scalar {
buffer_id,
pos: buf.max_pos(),
})
}
fn monadic_rank1(
&self,
es: &EditorState,
buffer_id: BufferID,
_interval: &Interval,
) -> Result<Selection, SelectionFunctionError> {
let buf = get_buffer(es, buffer_id)?;
Ok(Selection::Scalar {
buffer_id,
pos: buf.max_pos(),
})
}
}
pub struct SequentialReverseEnd;
impl UnparameterisedSelectionFunction for SequentialReverseEnd {
const NAME: &'static str = "sequential_reverse_end";
fn niladic(&self, _es: &EditorState) -> Result<Selection, SelectionFunctionError> {
Err(SelectionFunctionError::NoNiladicForm(";'$"))
}
fn monadic_rank0(
&self,
_es: &EditorState,
buffer_id: BufferID,
pos: usize,
) -> Result<Selection, SelectionFunctionError> {
Ok(Selection::Scalar { buffer_id, pos })
}
fn monadic_rank1(
&self,
_es: &EditorState,
buffer_id: BufferID,
interval: &Interval,
) -> Result<Selection, SelectionFunctionError> {
Ok(Selection::Scalar {
buffer_id,
pos: interval.end,
})
}
}
pub struct ReverseSequentialEnd;
impl UnparameterisedSelectionFunction for ReverseSequentialEnd {
const NAME: &'static str = "reverse_sequential_end";
fn niladic(&self, _es: &EditorState) -> Result<Selection, SelectionFunctionError> {
Err(SelectionFunctionError::NoNiladicForm("';$"))
}
fn monadic_rank0(
&self,
_es: &EditorState,
buffer_id: BufferID,
pos: usize,
) -> Result<Selection, SelectionFunctionError> {
Ok(Selection::Scalar { buffer_id, pos })
}
fn monadic_rank1(
&self,
_es: &EditorState,
buffer_id: BufferID,
interval: &Interval,
) -> Result<Selection, SelectionFunctionError> {
Ok(Selection::Scalar {
buffer_id,
pos: interval.end,
})
}
}
/// Dispatch on the search modifier and apply the matching end-family
/// function to the supplied selections.
pub fn selection_function_end(
es: &EditorState,
left: Option<&Selection>,
right: Option<&Selection>,
search_mod: Option<SearchModifier>,
) -> Result<Selection, SelectionFunctionError> {
match search_mod {
None => End.apply(&(), es, left, right),
Some(SearchModifier::Sequential) => SequentialEnd.apply(&(), es, left, right),
Some(SearchModifier::Reverse) => ReverseEnd.apply(&(), es, left, right),
Some(SearchModifier::SequentialReverse) => SequentialReverseEnd.apply(&(), es, left, right),
Some(SearchModifier::ReverseSequential) => ReverseSequentialEnd.apply(&(), es, left, right),
}
}
|
