ascii_renderer/
char_buffer.rs1#[derive(Debug, Clone, PartialEq, PartialOrd)]
11pub struct CharBuffer {
12 pub data: Vec<Vec<char>>,
13 pub dimensions: (usize, usize),
14}
15
16#[derive(Debug)]
17pub enum CharBufferError {
18 RowOutOfRange { row: usize },
19 ItemOutOfRange { index: usize },
20}
21
22impl CharBuffer {
23 pub fn new(width: usize, height: usize) -> Self {
24 CharBuffer {
25 data: vec![vec![' '; width]; height],
26 dimensions: (width, height),
27 }
28 }
29 pub fn get_char(&self, x: usize, y: usize) -> Option<char> {
30 self.data.get(y)?.get(x).map(|x| *x)
31 }
32 pub fn set_char(&mut self, x: usize, y: usize, value: char) -> Result<(), CharBufferError> {
33 let row = self.data.get_mut(y);
34 if row.is_none() {
35 return Err(CharBufferError::RowOutOfRange { row: y });
36 }
37
38 let item = row.unwrap().get_mut(x);
39 if item.is_none() {
40 return Err(CharBufferError::ItemOutOfRange { index: x });
41 }
42
43 *item.unwrap() = value;
44
45 Ok(())
46 }
47 pub fn fill(&mut self, char: char) {
48 for row in self.data.iter_mut() {
50 for item in row.iter_mut() {
51 *item = char;
52 }
53 }
54 }
55}
56
57impl std::fmt::Display for CharBuffer {
58 fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
59 write!(
60 f,
61 "{}",
62 self.data
63 .iter()
64 .map(|x| [
65 x.iter().map(|x| [x, &' ']).flatten().collect::<String>(),
66 "\n".to_owned()
67 ])
68 .flatten()
69 .collect::<String>()
70 )
71 }
72}
73
74#[cfg(test)]
75mod tests {
76 use super::*;
77
78 #[test]
79 fn char_retreival() {
80 let mut buf = CharBuffer::new(3, 3);
81 buf.set_char(2, 2, 'x').unwrap();
82 assert_eq!(buf.get_char(2, 2).unwrap(), 'x');
83 }
84
85 #[test]
86 #[should_panic]
87 fn char_setter_bounds_check() {
88 let mut buf = CharBuffer::new(2, 2);
89 buf.set_char(2, 2, 'x').unwrap();
90 }
91
92 #[test]
93 #[should_panic]
94 fn char_getter_bounds_check() {
95 let buf = CharBuffer::new(2, 2);
96 buf.get_char(2, 2).unwrap();
97 }
98
99 #[test]
100 fn char_buf_to_string() {
101 let mut buf = CharBuffer::new(3, 3);
102 buf.set_char(0, 0, 'n').unwrap();
103 buf.set_char(2, 1, 'x').unwrap();
104 buf.set_char(2, 2, 'z').unwrap();
105 assert_eq!(&buf.to_string(), "n \n x \n z \n");
106 }
107}