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|
use std::str::FromStr;
use super::cursor::{Cursor, CursorMove};
#[derive(Default, Debug)]
pub struct Buffer {
lines: Vec<String>,
cursor: Cursor,
}
impl Buffer {
pub fn new() -> Self {
Self {
lines: Vec::new(),
cursor: Cursor::new().with_position(0, 0).with_max(0, 0),
}
}
fn refresh_line_max(&mut self) {
self.cursor
.set_x_max(self.lines[self.cursor.y() as usize].len())
}
fn refresh_buffer_max(&mut self) {
self.cursor.set_y_max(self.lines.len() - 1);
}
fn refresh_max(&mut self) {
self.refresh_line_max();
self.refresh_buffer_max();
}
fn end_balance(&self, level: usize) -> isize {
let str = "\t".repeat(level);
let start_count = self
.lines
.iter()
.filter(|s| {
s.starts_with(&(str.clone() + "if "))
|| s.starts_with(&(str.clone() + "for "))
|| s.starts_with(&(str.clone() + "while "))
|| (s.starts_with(&str) && s.contains("function(") && s.ends_with(")"))
})
.count();
let end_count = self
.lines
.iter()
.filter(|s| s.starts_with(&(str.clone() + "end ")) || **s == (str.clone() + "end"))
.count();
(end_count as isize) - (start_count as isize)
}
pub fn insert(&mut self, c: char) {
match c {
'\n' => {
let (a, b) = {
let line = self.current_line();
let (a, b) = line.split_at(self.cursor.x());
(a.to_string(), b.to_string())
};
let indent_normalized = a.replace(" ", "\t");
let indent = indent_normalized.len() - indent_normalized.trim_start().len();
let l = a.trim();
let insert_end = (l.starts_with("if ") && l.ends_with(" then"))
|| ((l.starts_with("for ") || l.starts_with("while ")) && l.ends_with(" do"))
|| (l.contains("function(") && l.ends_with(")"));
let extra_indent = if insert_end { 1 } else { 0 };
{
*self.current_line_mut() = a;
}
self.cursor.move_unchecked(CursorMove::Down(1));
self.cursor.move_unchecked(CursorMove::Begin);
self.lines
.insert(self.cursor().y(), "\t".repeat(indent + extra_indent) + &b);
if insert_end && self.end_balance(indent) < 0 {
self.lines
.insert(self.cursor().y() + 1, "\t".repeat(indent) + "end");
}
self.refresh_max();
self.cursor
.move_checked(CursorMove::Right(indent + extra_indent));
}
_ => {
let x = self.cursor().x();
self.current_line_mut().insert(x, c);
self.refresh_line_max();
self.cursor.move_checked(CursorMove::Right(1));
}
}
}
pub fn delete(&mut self) {
if self.cursor.is_at_start() && !self.cursor.is_at_top() {
let old_line = self.current_line_mut().clone();
self.lines.remove(self.cursor.y());
self.cursor.move_checked(CursorMove::Up(1));
self.refresh_line_max();
let new_x = self.current_line().len();
self.current_line_mut().push_str(&old_line);
self.cursor
.move_checked(CursorMove::Jump((new_x, self.cursor.y())));
self.refresh_buffer_max()
} else {
let x = self.cursor.x() - 1;
self.current_line_mut().remove(x);
self.refresh_line_max();
self.cursor.move_checked(CursorMove::Left(1));
}
}
pub fn line(&self, index: usize) -> Option<&String> {
self.lines.get(index)
}
fn line_mut(&mut self, index: usize) -> Option<&mut String> {
self.lines.get_mut(index)
}
pub fn current_line(&self) -> &String {
self.line(self.cursor.y() as usize).unwrap()
}
fn current_line_mut(&mut self) -> &mut String {
self.line_mut(self.cursor.y() as usize).unwrap()
}
pub fn cursor(&self) -> &Cursor {
&self.cursor
}
pub fn move_cursor(&mut self, m: CursorMove) {
match m {
CursorMove::Up(_)
| CursorMove::Down(_)
| CursorMove::Top
| CursorMove::Bottom
| CursorMove::Jump(_) => {
self.cursor.move_checked(m);
self.cursor.set_x_max(self.current_line().len());
self.cursor.correct_cursor_position();
}
CursorMove::Left(_) | CursorMove::Right(_) | CursorMove::Begin | CursorMove::End => {
self.cursor.move_checked(m)
}
}
}
pub fn lines(&self) -> &Vec<String> {
&self.lines
}
}
impl FromStr for Buffer {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
let lines: Vec<_> = s.lines().map(|s| s.to_string()).collect();
let mut buffer = Self::new();
buffer.lines = lines;
buffer.refresh_max();
Ok(buffer)
}
}
|
