timw4mail/rs-kilo
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Make Editor.rows a vector, cleanup some code and logic

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This commit is contained in:
Timothy Warren 2019-08-27 15:13:32 -04:00
parent 4167088f81
commit 160b840151
1 changed files with 55 additions and 44 deletions
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85
src/editor.rs
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@ -9,6 +9,7 @@ use std::io::BufReader;
use self::EditorKey::*;
/// A representation of a line in the editor
#[derive(Debug, Default)]
pub struct EditorRow {
chars: String,
@ -23,19 +24,19 @@ impl EditorRow {
}
/// Main structure for the editor
///
/// impl blocks are split similarly to the original C implementation
/// `EditorConfig` struct in C version
#[derive(Debug, Default)]
pub struct Editor {
cursor_x: usize,
cursor_y: usize,
row: EditorRow,
num_rows: usize,
rows: Vec<EditorRow>,
row_offset: usize,
screen_cols: usize,
screen_rows: usize,
output_buffer: String,
}
/// Keycode mapping enum
#[derive(Copy, Clone, Debug, PartialEq)]
enum EditorKey<T> {
Escape,
@ -48,6 +49,7 @@ enum EditorKey<T> {
EndKey,
PageUp,
PageDown,
/// Any other type of character
OtherKey(T),
}
@ -60,24 +62,29 @@ impl EditorKey<char> {
}
}
// init
impl Editor {
// ------------------------------------------------------------------------
// Init
// ------------------------------------------------------------------------
pub fn new() -> Self {
let mut instance = Self::default();
let size = instance.get_window_size();
instance.rows = vec![];
instance.cursor_x = 0;
instance.cursor_y = 0;
instance.num_rows = 0;
instance.screen_cols = size.cols as usize;
instance.screen_rows = size.rows as usize;
instance
}
}
// ------------------------------------------------------------------------
// Terminal
impl Editor {
// ------------------------------------------------------------------------
fn read_key(&mut self) -> Option<Vec<EditorKey<char>>> {
// TODO: see if return type can be simplified
let stdin = io::stdin();
let stdin = stdin.lock();
let mut in_str = String::new();
@ -149,10 +156,11 @@ impl Editor {
None => unimplemented!("The easy way usually works"),
}
}
}
// ------------------------------------------------------------------------
// Input
impl Editor {
// ------------------------------------------------------------------------
fn move_cursor(&mut self, key: &EditorKey<char>) {
match key {
ArrowLeft => {
@ -182,11 +190,8 @@ impl Editor {
/// Route user input to the appropriate handler method
pub fn process_keypress(&mut self) -> Option<()> {
let chars = self.read_key();
if chars.is_none() {
Some(()) // Continue input loop on empty input
} else {
if chars.is_some() {
let chars = chars.unwrap();
// print!("{:?}\r\n", &chars);
let first = &chars[0];
match first {
@ -212,11 +217,11 @@ impl Editor {
ArrowRight => self.move_cursor(&ArrowRight),
_ => (),
};
}
// Continue the main input loop
Some(())
}
}
fn page_up_or_down(&mut self, key: EditorKey<char>) {
let mut times = self.screen_rows;
@ -230,10 +235,11 @@ impl Editor {
}
}
}
}
// ------------------------------------------------------------------------
// Output
impl Editor {
// ------------------------------------------------------------------------
/// Equivalent of the abAppend function
/// in the original tutorial, just appends
/// to the `output_buffer` String in the
@ -244,10 +250,12 @@ impl Editor {
fn draw_rows(&mut self) {
for y in 0..self.screen_rows {
if y >= self.num_rows {
if y == (self.screen_rows / 3) {
let mut welcome =
format!("Kilo editor -- version {}", env!("CARGO_PKG_VERSION"));
if y >= self.rows.len() {
if self.rows.is_empty() && y == (self.screen_rows / 3) {
let mut welcome = format!(
"Oxidized Kilo editor -- version {}",
env!("CARGO_PKG_VERSION")
);
if welcome.len() > self.screen_cols {
welcome.truncate(self.screen_cols)
}
@ -258,9 +266,8 @@ impl Editor {
self.append_out("~");
padding -= 1;
}
while padding > 0 {
for _ in 0..padding {
self.append_out(" ");
padding -= 1;
}
self.append_out(&welcome);
@ -268,7 +275,7 @@ impl Editor {
self.append_out("~");
}
} else {
let mut output = self.row.chars.clone();
let mut output = self.rows[y].chars.clone();
if output.len() > self.screen_cols {
output.truncate(self.screen_cols);
}
@ -286,8 +293,8 @@ impl Editor {
self.output_buffer.clear();
// Hide cursor, reposition cursor
//self.append_out("\x1b[?25l");
//self.append_out("\x1b[H");
self.append_out("\x1b[?25l");
self.append_out("\x1b[H");
self.draw_rows();
@ -302,26 +309,30 @@ impl Editor {
let mut handle = stdout.lock();
handle.write_all(&self.output_buffer.as_bytes())
}
// ------------------------------------------------------------------------
// Row Operations
// ------------------------------------------------------------------------
fn append_row(&mut self, row: &str) {
self.rows.push(EditorRow::new(row));
}
// ------------------------------------------------------------------------
// File I/O
impl Editor {
// ------------------------------------------------------------------------
/// Open a file for display
pub fn open(&mut self, filename: &str) -> io::Result<()> {
let file = File::open(filename)?;
let buf_reader = BufReader::new(file);
let mut lines = buf_reader.lines().map(|l| l.unwrap());
let lines = buf_reader.lines().map(|l| l.unwrap());
let line = lines.next().unwrap();
self.row = EditorRow::new(&line);
self.num_rows = 1;
for line in lines {
self.append_row(&line);
}
/*for line in lines {
let
}*/
// let line_res = buf_reader.read_line()
// self.row = EditorRow::new("Hello, world!");
// self.num_rows += 1;
Ok(())
}
}