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|
use crate::TextUnit;
use superslice::Ext;
#[derive(Clone, Debug, Hash, PartialEq, Eq)]
pub struct LineIndex {
newlines: Vec<TextUnit>,
}
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub struct LineCol {
pub line: u32,
pub col: TextUnit,
}
impl LineIndex {
pub fn new(text: &str) -> LineIndex {
let mut newlines = vec![0.into()];
let mut curr = 0.into();
for c in text.chars() {
curr += TextUnit::of_char(c);
if c == '\n' {
newlines.push(curr);
}
}
LineIndex { newlines }
}
pub fn line_col(&self, offset: TextUnit) -> LineCol {
let line = self.newlines.upper_bound(&offset) - 1;
let line_start_offset = self.newlines[line];
let col = offset - line_start_offset;
LineCol {
line: line as u32,
col,
}
}
pub fn offset(&self, line_col: LineCol) -> TextUnit {
//TODO: return Result
self.newlines[line_col.line as usize] + line_col.col
}
}
#[test]
fn test_line_index() {
let text = "hello\nworld";
let index = LineIndex::new(text);
assert_eq!(
index.line_col(0.into()),
LineCol {
line: 0,
col: 0.into()
}
);
assert_eq!(
index.line_col(1.into()),
LineCol {
line: 0,
col: 1.into()
}
);
assert_eq!(
index.line_col(5.into()),
LineCol {
line: 0,
col: 5.into()
}
);
assert_eq!(
index.line_col(6.into()),
LineCol {
line: 1,
col: 0.into()
}
);
assert_eq!(
index.line_col(7.into()),
LineCol {
line: 1,
col: 1.into()
}
);
assert_eq!(
index.line_col(8.into()),
LineCol {
line: 1,
col: 2.into()
}
);
assert_eq!(
index.line_col(10.into()),
LineCol {
line: 1,
col: 4.into()
}
);
assert_eq!(
index.line_col(11.into()),
LineCol {
line: 1,
col: 5.into()
}
);
assert_eq!(
index.line_col(12.into()),
LineCol {
line: 1,
col: 6.into()
}
);
let text = "\nhello\nworld";
let index = LineIndex::new(text);
assert_eq!(
index.line_col(0.into()),
LineCol {
line: 0,
col: 0.into()
}
);
assert_eq!(
index.line_col(1.into()),
LineCol {
line: 1,
col: 0.into()
}
);
assert_eq!(
index.line_col(2.into()),
LineCol {
line: 1,
col: 1.into()
}
);
assert_eq!(
index.line_col(6.into()),
LineCol {
line: 1,
col: 5.into()
}
);
assert_eq!(
index.line_col(7.into()),
LineCol {
line: 2,
col: 0.into()
}
);
}
|
