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|
use crate::buffer::{Buffer, BufferID};
use crate::selection::Selection;
use std::collections::HashMap;
use std::path::PathBuf;
#[derive(Debug, Clone)]
pub enum StateChange {
SetCurrentSelection {
old_selection: Selection,
new_selection: Selection,
},
SetCurrentBuffer {
old_buffer: BufferID,
new_buffer: BufferID,
},
ModifyBuffer {
buffer: BufferID,
old_start: usize,
old_end: usize,
old_content: String,
new_content: String,
},
CreateBuffer {
buffer: BufferID,
file: Option<PathBuf>,
},
DeleteBuffer {
buffer: BufferID,
},
}
impl StateChange {
pub fn invert(&self) -> Option<Self> {
match self {
StateChange::SetCurrentSelection {
old_selection,
new_selection,
} => Some(StateChange::SetCurrentSelection {
old_selection: new_selection.clone(),
new_selection: old_selection.clone(),
}),
StateChange::SetCurrentBuffer {
old_buffer,
new_buffer,
} => Some(StateChange::SetCurrentBuffer {
old_buffer: *new_buffer,
new_buffer: *old_buffer,
}),
StateChange::ModifyBuffer { .. } => None, // TODO: implement, irritating coordinate stuff
// TODO: Not supported?
StateChange::CreateBuffer { .. } => None,
StateChange::DeleteBuffer { .. } => None,
}
}
}
#[derive(Debug)]
pub struct EditorState {
current_buffer: BufferID,
current_selection: Selection,
buffers: HashMap<BufferID, Buffer>,
buffer_to_file: HashMap<BufferID, Option<PathBuf>>,
history: Vec<StateChange>,
next_buffer_id: BufferID,
}
impl EditorState {
pub fn new() -> Self {
Self {
current_buffer: 0,
current_selection: Selection::empty(),
buffers: HashMap::new(),
buffer_to_file: HashMap::new(),
history: Vec::new(),
next_buffer_id: 0,
}
}
pub fn create_buffer(
&mut self,
name: String,
content: String,
file: Option<PathBuf>,
) -> BufferID {
let buffer_id = self.next_buffer_id;
self.next_buffer_id += 1;
let buffer = Buffer::new(name, content);
self.buffers.insert(buffer_id, buffer);
self.buffer_to_file.insert(buffer_id, file.clone());
self.history.push(StateChange::CreateBuffer {
buffer: buffer_id,
file,
});
buffer_id
}
pub fn get_buffer(&self, buffer_id: BufferID) -> Option<&Buffer> {
self.buffers.get(&buffer_id)
}
pub fn get_buffer_mut(&mut self, buffer_id: BufferID) -> Option<&mut Buffer> {
self.buffers.get_mut(&buffer_id)
}
pub fn commit(&mut self, change: StateChange) {
match &change {
StateChange::SetCurrentSelection { new_selection, .. } => {
self.current_selection = new_selection.clone();
}
StateChange::SetCurrentBuffer { new_buffer, .. } => {
self.current_buffer = *new_buffer;
}
StateChange::ModifyBuffer {
buffer,
old_start,
old_end,
new_content,
..
} => {
if let Some(buf) = self.buffers.get_mut(buffer) {
buf.content = format!(
"{}{}{}",
&buf.content[..*old_start],
new_content,
&buf.content[*old_end..]
);
}
}
StateChange::CreateBuffer { buffer, file } => {
// TODO: do we want this?
if !self.buffer_to_file.contains_key(buffer) {
self.buffer_to_file.insert(*buffer, file.clone());
}
}
StateChange::DeleteBuffer { buffer } => {
self.buffers.remove(buffer);
self.buffer_to_file.remove(buffer);
}
}
self.history.push(change);
}
pub fn commit_changes(&mut self, changes: Vec<StateChange>) {
for change in changes {
self.commit(change);
}
}
}
pub type EvaluationResult = (Selection, Vec<StateChange>);
|
