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pub fn generate_outer_backticks(contents: impl AsRef<[u8]>) -> String {
let bytes = contents.as_ref();
let mut max_ticks = 0;
let mut current_count = 0;
for &byte in bytes {
if byte == b'`' {
current_count += 1;
if current_count > max_ticks {
max_ticks = current_count;
}
} else {
current_count = 0;
}
}
let fence_len = std::cmp::max(3, max_ticks + 1);
"`".repeat(fence_len)
}
#[cfg(test)]
mod tests {
use super::generate_outer_backticks;
#[test]
fn empty_content_returns_three_backticks() {
assert_eq!(generate_outer_backticks(b""), "```");
assert_eq!(generate_outer_backticks(""), "```");
}
#[test]
fn content_without_backticks_returns_three_backticks() {
assert_eq!(generate_outer_backticks(b"no backticks here"), "```");
assert_eq!(generate_outer_backticks("hello world"), "```");
}
#[test]
fn single_backtick_returns_three_backticks() {
assert_eq!(generate_outer_backticks(b"`"), "```");
assert_eq!(generate_outer_backticks("a ` b"), "```");
}
#[test]
fn two_consecutive_backticks_returns_three_backticks() {
assert_eq!(generate_outer_backticks(b"``"), "```");
assert_eq!(generate_outer_backticks("a `` b"), "```");
}
#[test]
fn three_consecutive_backticks_returns_four_backticks() {
assert_eq!(generate_outer_backticks(b"```"), "````");
assert_eq!(generate_outer_backticks("a ``` b"), "````");
}
#[test]
fn four_consecutive_backticks_returns_five_backticks() {
assert_eq!(generate_outer_backticks(b"````"), "`````");
assert_eq!(generate_outer_backticks("a ```` b"), "`````");
}
#[test]
fn long_run_of_backticks_returns_run_plus_one() {
let run = 10;
let input = "`".repeat(run);
let expected = "`".repeat(run + 1);
assert_eq!(generate_outer_backticks(&input), expected);
}
#[test]
fn maximum_run_across_multiple_groups() {
let input = "``` and then ````` and then ``"; // longest run is 5
assert_eq!(generate_outer_backticks(input), "``````"); // 5+1 = 6
}
#[test]
fn backticks_at_start_or_end_handled_correctly() {
assert_eq!(generate_outer_backticks("````start"), "`````");
assert_eq!(generate_outer_backticks("end`````"), "``````");
}
}
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