ged/core/src/editor_buffer/mod.rs

378 lines
13 KiB
Rust

use std::{path::PathBuf, rc::Rc};
use crate::{Point, TextBuffer};
mod command;
mod io;
pub use command::{Command, Movement, Unit};
#[derive(Default, Clone)]
pub struct EditorBuffer {
buffer: TextBuffer,
cursor: Point,
state: Rc<EditorBufferState>,
}
#[derive(Default)]
struct EditorBufferState {
filepath: Option<PathBuf>,
}
#[derive(Debug, PartialEq)]
pub enum CommandResponse {
None,
Message(String),
}
#[must_use]
pub struct CommandResult {
success: bool,
pub response: CommandResponse,
pub buffer: EditorBuffer,
}
impl CommandResult {
pub fn is_ok(&self) -> bool {
self.success
}
fn ok(buffer: EditorBuffer) -> Self {
Self {
success: true,
response: CommandResponse::None,
buffer,
}
}
fn success_with_message(buffer: EditorBuffer, msg: impl Into<String>) -> Self {
Self {
success: true,
response: CommandResponse::Message(msg.into()),
buffer,
}
}
fn fail_with_message(buffer: EditorBuffer, msg: impl Into<String>) -> Self {
Self {
success: false,
response: CommandResponse::Message(msg.into()),
buffer,
}
}
}
impl EditorBuffer {
/// Create new empty [EditorBuffer]
pub fn new() -> Self {
Self::default()
}
/// Execute a command on the [EditorBuffer]
pub fn execute(&self, command: Command) -> CommandResult {
match command {
Command::OpenFile(filepath) => self.open_file(filepath),
Command::Save => self.save_file(None),
Command::SaveAs(filepath) => self.save_file(Some(filepath)),
Command::MoveCursorTo(point) => self.move_cursor_to_point(point),
Command::MoveCursorToLine(line_num) => self.move_cursor_to_line_number(line_num),
Command::MoveCursor(movement) => self.move_cursor(movement),
Command::InsertChar(c) => self.insert_char(c),
Command::InsertString(s) => self.insert_string(s),
Command::Delete(movement) => self.delete(movement),
}
}
pub fn get_cursor_position(&self) -> Point {
self.cursor
}
fn move_cursor_to_point(&self, point: Point) -> CommandResult {
CommandResult::ok(Self {
cursor: point,
..self.clone()
})
}
fn move_cursor_to_line_number(&self, line_num: usize) -> CommandResult {
self.move_cursor_to_point(Point::LineColumn(line_num, 0))
}
fn insert_char(&self, c: char) -> CommandResult {
let newline = c == '\n';
CommandResult::ok(Self {
buffer: self.buffer.insert_char(c, self.cursor),
cursor: match self.cursor {
Point::Start => {
if newline {
Point::LineColumn(1, 0)
} else {
Point::LineColumn(0, 1)
}
}
Point::LineColumn(line, column) => {
if newline {
Point::LineColumn(line + 1, 0)
} else {
Point::LineColumn(line, column + 1)
}
}
Point::End => Point::End,
},
..self.clone()
})
}
fn insert_string(&self, _s: String) -> CommandResult {
todo!()
}
fn move_cursor(&self, _movement: Movement) -> CommandResult {
todo!()
}
fn delete(&self, _movement: Movement) -> CommandResult {
todo!()
}
}
#[cfg(test)]
mod tests {
use super::*;
use std::io::{Read, Seek, SeekFrom, Write};
use tempfile::NamedTempFile;
fn create_simple_test_file() -> NamedTempFile {
let inner = || {
let mut file = NamedTempFile::new()?;
writeln!(file, "Messe ocus Pangur Bán,")?;
writeln!(file, "cechtar nathar fria saindan")?;
writeln!(file, "bíth a menmasam fri seilgg")?;
writeln!(file, "mu menma céin im saincheirdd.")?;
writeln!(file)?;
writeln!(file, "Caraimse fos ferr cach clú")?;
writeln!(file, "oc mu lebran leir ingn")?;
writeln!(file, "ni foirmtech frimm Pangur Bá")?;
writeln!(file, "caraid cesin a maccdán.")?;
writeln!(file)?;
writeln!(file, "Orubiam scél cen scís")?;
writeln!(file, "innar tegdais ar noendís")?;
writeln!(file, "taithiunn dichrichide clius")?;
writeln!(file, "ni fristarddam arnáthius.")?;
file.seek(SeekFrom::Start(0))?;
Ok::<_, std::io::Error>(file)
};
inner().expect("Creating temporary file")
}
#[test]
fn open_file_loads_file_contents() {
let mut test_file = create_simple_test_file();
let mut expected_contents = String::new();
test_file
.read_to_string(&mut expected_contents)
.expect("Reading text file");
let target = EditorBuffer::new();
let result = target.execute(Command::OpenFile(test_file.path().into()));
let found_contents: String = result.buffer.buffer.iter_chars().collect();
assert_eq!(expected_contents, found_contents);
}
#[test]
fn cursor_at_beginning_after_file_opened() {
let test_file = create_simple_test_file();
let target = EditorBuffer::new();
let result = target.execute(Command::OpenFile(test_file.path().into()));
assert_eq!(Point::Start, result.buffer.get_cursor_position());
}
#[test]
fn move_cursor_to_point_in_file() {
let test_file = create_simple_test_file();
let target = EditorBuffer::new();
let result = target.execute(Command::OpenFile(test_file.path().into()));
assert!(result.is_ok());
let target = result.buffer;
let result = target.execute(Command::MoveCursorTo(Point::LineColumn(0, 5)));
assert!(result.is_ok());
let target = result.buffer;
assert_eq!(Point::LineColumn(0, 5), target.get_cursor_position());
let result = target.execute(Command::MoveCursorTo(Point::LineColumn(3, 11)));
assert!(result.is_ok());
let target = result.buffer;
assert_eq!(Point::LineColumn(3, 11), target.get_cursor_position());
let result = target.execute(Command::MoveCursorTo(Point::LineColumn(3, 0)));
assert!(result.is_ok());
let target = result.buffer;
assert_eq!(Point::LineColumn(3, 0), target.get_cursor_position());
}
#[test]
fn insert_character() {
let mut test_file = create_simple_test_file();
let mut file_contents = String::new();
test_file
.read_to_string(&mut file_contents)
.expect("Reading text file");
let test_file = test_file;
let mut expected_lines: Vec<_> = file_contents.lines().collect();
expected_lines[2] = "Xbíth a menmasam fri seilgg";
let expected_lines = expected_lines;
let target = EditorBuffer::new();
let result = target.execute(Command::OpenFile(test_file.path().into()));
assert!(result.is_ok());
let target = result.buffer;
let result = target.execute(Command::MoveCursorTo(Point::LineColumn(3, 0)));
assert!(result.is_ok());
let target = result.buffer;
let result = target.execute(Command::InsertChar('X'));
assert!(result.is_ok());
let target = result.buffer;
let found_lines: Vec<String> = target
.buffer
.iter_chars()
.collect::<String>()
.lines()
.map(|l| l.into())
.collect();
assert_eq!(expected_lines, found_lines);
let mut test_file = create_simple_test_file();
let mut file_contents = String::new();
test_file
.read_to_string(&mut file_contents)
.expect("Reading text file");
let test_file = test_file;
let mut expected_lines: Vec<_> = file_contents.lines().collect();
expected_lines[2] = "bXíth a menmasam fri seilgg";
let expected_lines = expected_lines;
let target = EditorBuffer::new();
let result = target.execute(Command::OpenFile(test_file.path().into()));
assert!(result.is_ok());
let target = result.buffer;
let result = target.execute(Command::MoveCursorTo(Point::LineColumn(3, 1)));
assert!(result.is_ok());
let target = result.buffer;
let result = target.execute(Command::InsertChar('X'));
assert!(result.is_ok());
let target = result.buffer;
let found_lines: Vec<String> = target
.buffer
.iter_chars()
.collect::<String>()
.lines()
.map(|l| l.into())
.collect();
assert_eq!(expected_lines, found_lines);
let mut test_file = create_simple_test_file();
let mut file_contents = String::new();
test_file
.read_to_string(&mut file_contents)
.expect("Reading text file");
let test_file = test_file;
let mut expected_lines: Vec<_> = file_contents.lines().collect();
expected_lines[2] = "bíXth a menmasam fri seilgg";
let expected_lines = expected_lines;
let target = EditorBuffer::new();
let result = target.execute(Command::OpenFile(test_file.path().into()));
assert!(result.is_ok());
let target = result.buffer;
let result = target.execute(Command::MoveCursorTo(Point::LineColumn(3, 2)));
assert!(result.is_ok());
let target = result.buffer;
let result = target.execute(Command::InsertChar('X'));
assert!(result.is_ok());
let target = result.buffer;
let found_lines: Vec<String> = target
.buffer
.iter_chars()
.collect::<String>()
.lines()
.map(|l| l.into())
.collect();
assert_eq!(expected_lines, found_lines);
let mut test_file = create_simple_test_file();
let mut file_contents = String::new();
test_file
.read_to_string(&mut file_contents)
.expect("Reading text file");
let test_file = test_file;
let mut expected_lines: Vec<_> = file_contents.lines().collect();
expected_lines[2] = "bíth a menmXasam fri seilgg";
let expected_lines = expected_lines;
let target = EditorBuffer::new();
let result = target.execute(Command::OpenFile(test_file.path().into()));
assert!(result.is_ok());
let target = result.buffer;
let result = target.execute(Command::MoveCursorTo(Point::LineColumn(3, 11)));
assert!(result.is_ok());
let target = result.buffer;
let result = target.execute(Command::InsertChar('X'));
assert!(result.is_ok());
let target = result.buffer;
let found_lines: Vec<String> = target
.buffer
.iter_chars()
.collect::<String>()
.lines()
.map(|l| l.into())
.collect();
assert_eq!(expected_lines, found_lines);
}
#[test]
fn insert_line() {
let mut test_file = create_simple_test_file();
let mut file_contents = String::new();
test_file
.read_to_string(&mut file_contents)
.expect("Reading text file");
let test_file = test_file;
let mut expected_lines: Vec<_> = file_contents.lines().collect();
expected_lines.insert(6, "abc 123".into());
let target = EditorBuffer::new();
let result = target.execute(Command::OpenFile(test_file.path().into()));
assert!(result.is_ok());
let target = result.buffer;
let result = target.execute(Command::MoveCursorToLine(7));
assert!(result.is_ok());
let target = result.buffer;
let result = target.execute(Command::InsertChar('a'));
assert!(result.is_ok());
let target = result.buffer;
let result = target.execute(Command::InsertChar('b'));
assert!(result.is_ok());
let target = result.buffer;
let result = target.execute(Command::InsertChar('c'));
assert!(result.is_ok());
let target = result.buffer;
let result = target.execute(Command::InsertChar(' '));
assert!(result.is_ok());
let target = result.buffer;
let result = target.execute(Command::InsertChar('1'));
assert!(result.is_ok());
let target = result.buffer;
let result = target.execute(Command::InsertChar('2'));
assert!(result.is_ok());
let target = result.buffer;
let result = target.execute(Command::InsertChar('3'));
assert!(result.is_ok());
let target = result.buffer;
let result = target.execute(Command::InsertChar('\n'));
assert!(result.is_ok());
let target = result.buffer;
let found_lines: Vec<String> = target
.buffer
.iter_chars()
.collect::<String>()
.lines()
.map(|l| l.into())
.collect();
assert_eq!(expected_lines, found_lines);
assert_eq!(Point::LineColumn(8, 0), target.get_cursor_position());
}
}