line-numbers

line-numbers 是一个 Rust crate，用于高效地查找字符串偏移量对应的行号。

用法

创建一个 LinePositions，然后你可以找到一个偏移量的行号。

let s = "foo\nbar\nbaz\n";
let s_lines: Vec<_> = s.lines().collect();

let line_positions = LinePositions::from(s);

let offset = 5;
let line_num = line_positions.from_offset(offset);
println!(
    "Offset {} is on line {}, which has the text {:?}.",
    offset,
    line_num.display(),
    s_lines[line_num.as_usize()]
);

类似项目

• line-span 解决了类似的问题，但每次都会扫描整个字符串。

lib.rs:

高效地在字符串内查找行号和行跨度。

use line_numbers::LinePositions;

let s = "foo\nbar\nbaz\n";
let s_lines: Vec<_> = s.lines().collect();

let line_positions = LinePositions::from(s);

let offset = 5;
let line_num = line_positions.from_offset(offset);
println!(
    "Offset {} is on line {}, which has the text {:?}.",
    offset,
    line_num.display(),
    s_lines[line_num.as_usize()]
);