2 releases

0.1.1 Jun 24, 2023
0.1.0 Jun 24, 2023

#37 in #tbd

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MIT license

14KB
219 lines

Crate lineindex

Simple line-indexed string.

Example

TBD

Changes

Version: 0.1.1

  1. Added an implementation of AsRef<str> for IndexedString.
  2. Added as_str() method to IndexedString.
  3. Added as_bytes() method to IndexedString.

Version: 0.1.0

Initial version.


lib.rs:

A simple line-indexed string.

Rather than destructively breaking a string into lines, this structure will allow create a vector of byte/character ranges each of which describes a line in the string original string.

Example

Given the following simple string,

1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9
-----------------------------------------------------------
a a ␤ b b b ␤ c c c c ␤ d d

We get the following set of line index ranges.

| Row | < Byte | < Char | > Byte | > Char | String | |======|========|========|========|========|=========| | 0 | 0 | 0 | 2 | 2 | "aa␤" | | 1 | 3 | 3 | 6 | 6 | "bbb␤" | | 2 | 7 | 7 | 11 | 11 | "cccc␤" | | 3 | 12 | 12 | 13 | 13 | "dd" |

This set of ranges can be used to determine which line a character is on as well as returning the indices for a line or even the text of a line.

use lineindex::IndexedString;

let indexed = IndexedString::from("aa\nbbb\ncccc\ndd");

assert_eq!(indexed.lines(), 4);

assert_eq!(indexed.line_for_byte(4), Some(1));
assert_eq!(indexed.line_for_character(5), Some(1));

assert_eq!(indexed.byte_range_for_line(1), Some(3..=6));
assert_eq!(indexed.character_range_for_line(2), Some(7..=11));

assert_eq!(indexed.line_str(0), Some("aa\n"));

No runtime deps