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|
use crate::{
backend::Backend,
buffer::{Buffer, Cell},
layout::Rect,
terminal::CursorKind,
};
use std::{fmt::Write, io};
use unicode_width::UnicodeWidthStr;
/// A backend used for the integration tests.
#[derive(Debug)]
pub struct TestBackend {
width: u16,
buffer: Buffer,
height: u16,
cursor: bool,
pos: (u16, u16),
}
/// Returns a string representation of the given buffer for debugging purpose.
fn buffer_view(buffer: &Buffer) -> String {
let mut view = String::with_capacity(buffer.content.len() + buffer.area.height as usize * 3);
for cells in buffer.content.chunks(buffer.area.width as usize) {
let mut overwritten = vec![];
let mut skip: usize = 0;
view.push('"');
for (x, c) in cells.iter().enumerate() {
if skip == 0 {
view.push_str(&c.symbol);
} else {
overwritten.push((x, &c.symbol))
}
skip = std::cmp::max(skip, c.symbol.width()).saturating_sub(1);
}
view.push('"');
if !overwritten.is_empty() {
write!(
&mut view,
" Hidden by multi-width symbols: {:?}",
overwritten
)
.unwrap();
}
view.push('\n');
}
view
}
impl TestBackend {
pub fn new(width: u16, height: u16) -> TestBackend {
TestBackend {
width,
height,
buffer: Buffer::empty(Rect::new(0, 0, width, height)),
cursor: false,
pos: (0, 0),
}
}
pub fn buffer(&self) -> &Buffer {
&self.buffer
}
pub fn resize(&mut self, width: u16, height: u16) {
self.buffer.resize(Rect::new(0, 0, width, height));
self.width = width;
self.height = height;
}
pub fn assert_buffer(&self, expected: &Buffer) {
assert_eq!(expected.area, self.buffer.area);
let diff = expected.diff(&self.buffer);
if diff.is_empty() {
return;
}
let mut debug_info = String::from("Buffers are not equal");
debug_info.push('\n');
debug_info.push_str("Expected:");
debug_info.push('\n');
let expected_view = buffer_view(expected);
debug_info.push_str(&expected_view);
debug_info.push('\n');
debug_info.push_str("Got:");
debug_info.push('\n');
let view = buffer_view(&self.buffer);
debug_info.push_str(&view);
debug_info.push('\n');
debug_info.push_str("Diff:");
debug_info.push('\n');
let nice_diff = diff
.iter()
.enumerate()
.map(|(i, (x, y, cell))| {
let expected_cell = expected.get(*x, *y);
format!(
"{}: at ({}, {}) expected {:?} got {:?}",
i, x, y, expected_cell, cell
)
})
.collect::<Vec<String>>()
.join("\n");
debug_info.push_str(&nice_diff);
panic!("{}", debug_info);
}
}
impl Backend for TestBackend {
fn draw<'a, I>(&mut self, content: I) -> Result<(), io::Error>
where
I: Iterator<Item = (u16, u16, &'a Cell)>,
{
for (x, y, c) in content {
let cell = self.buffer.get_mut(x, y);
*cell = c.clone();
}
Ok(())
}
fn hide_cursor(&mut self) -> Result<(), io::Error> {
self.cursor = false;
Ok(())
}
fn show_cursor(&mut self, _kind: CursorKind) -> Result<(), io::Error> {
self.cursor = true;
Ok(())
}
fn get_cursor(&mut self) -> Result<(u16, u16), io::Error> {
Ok(self.pos)
}
fn set_cursor(&mut self, x: u16, y: u16) -> Result<(), io::Error> {
self.pos = (x, y);
Ok(())
}
fn clear(&mut self) -> Result<(), io::Error> {
self.buffer.reset();
Ok(())
}
fn size(&self) -> Result<Rect, io::Error> {
Ok(Rect::new(0, 0, self.width, self.height))
}
fn flush(&mut self) -> Result<(), io::Error> {
Ok(())
}
}
|
