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|
use crate::{
app::AppState,
consts::FONT_PATH,
lisp::{
error::{EvalError, LispError, ParseError},
eval::Evaluator,
lex::Lexer,
parse::Parser,
},
message::Message,
};
use std::{
fs::OpenOptions,
io::{self, Cursor, Read},
path::Path,
};
use log::info;
use obi::Image;
use sdl2::{
keyboard::{Keycode, Mod},
pixels::Color,
render::Canvas,
ttf::Sdl2TtfContext,
video::Window,
};
#[macro_export]
macro_rules! rect(
($x:expr, $y:expr, $w:expr, $h:expr) => (
::sdl2::rect::Rect::new($x as i32, $y as i32, $w as u32, $h as u32)
)
);
pub fn draw_text<S: AsRef<str>>(
canvas: &mut Canvas<Window>,
ttf_context: &Sdl2TtfContext,
text: S,
color: Color,
(x, y): (i32, i32),
) -> u32 {
let text = text.as_ref();
let texture_creator = canvas.texture_creator();
let mut font = ttf_context.load_font(FONT_PATH, 17).unwrap();
font.set_style(sdl2::ttf::FontStyle::NORMAL);
font.set_hinting(sdl2::ttf::Hinting::Mono);
let surface = font
.render(if text.is_empty() { " " } else { text })
.blended(color)
.unwrap();
let texture = texture_creator
.create_texture_from_surface(&surface)
.unwrap();
let (width, height) = font.size_of(&text).unwrap();
let area = rect!(x, y, width, height);
canvas.copy(&texture, None, area).unwrap();
width
}
pub fn is_copy_event(keycode: Option<Keycode>, keymod: Mod) -> bool {
keycode == Some(Keycode::C) && (keymod == Mod::LCTRLMOD || keymod == Mod::RCTRLMOD)
}
pub fn is_paste_event(keycode: Option<Keycode>, keymod: Mod) -> bool {
keycode == Some(Keycode::V) && (keymod == Mod::LCTRLMOD || keymod == Mod::RCTRLMOD)
}
pub fn handle_error(err: ParseError, src: &str, file_name: &str) -> Message {
let mut message = Message::new();
message.set_error(err.display(&src, file_name));
message
}
pub fn load_script<P: AsRef<Path>>(path: P, app: &mut AppState) -> Result<(), LispError> {
let mut script = OpenOptions::new()
.read(true)
.write(false)
.create(false)
.open(path.as_ref())
.map_err(EvalError::ScriptLoadError)?;
let mut buf = String::new();
script
.read_to_string(&mut buf)
.map_err(EvalError::ScriptLoadError)?;
let mut parser = Parser::new(Lexer::new(&buf));
let mut evaluator = Evaluator {
app,
context: Vec::new(),
};
for expr in parser.parse_exprs().map_err(|err| {
LispError::Stringified(err.display(&buf, path.as_ref().to_str().unwrap_or("<unknown>")))
})? {
evaluator.eval(&expr)?;
}
Ok(())
}
pub fn load_file<P: AsRef<Path>>(path: P) -> Result<Image, io::Error> {
info!("loading existing file `{:?}`", path.as_ref());
let mut image = OpenOptions::new()
.read(true)
.write(false)
.create(false)
.open(&path)?;
let mut buf = Vec::new();
image.read_to_end(&mut buf)?;
Ok(Image::decode(&mut (Cursor::new(buf))).unwrap()) // TODO: obi error
}
pub fn compress<T: PartialEq + Clone>(scanline: &[T]) -> Vec<(T, usize)> {
let mut runs = vec![];
if scanline.is_empty() {
return runs;
}
let mut idx = 0;
loop {
let first = &scanline[idx];
let run_length = scanline[idx..]
.iter()
.take_while(|&item| item == first)
.count();
runs.push((first.clone(), run_length));
idx += run_length;
if idx > scanline.len() - 1 {
break;
}
}
runs
}
#[cfg(test)]
mod tests {
use super::compress;
#[test]
fn compression() {
let sl = [1, 1, 1, 2, 2, 2];
assert_eq!(compress(&sl), vec![(1, 3), (2, 3)]);
}
}
|
