report per-file chunks over coverage start/stop offsets and lines

[bartveneman]

See

css-code-coverage/src/index.ts

Line 123 in 4443395

// TODO: { is_covered: boolean, start_offset: number, start_line: number, end_offset: number, end_line: number }[]

This is useful because in projectwallace.com I'm manually calculating these things myself.

// Split coverage line numbers into chunks so we can easily loop over them in our layout
	let line_number_chunks = $derived.by(() => {
		if (!show_coverage) return

		let chunks = [
			{
				start_line: 0,
				is_covered: line_coverage[0] === 1,
				end_line: 0,
				size: 0
			}
		]

		for (let index = 0; index < line_coverage.length; index++) {
			let is_covered = line_coverage[index]
			if (index > 0 && is_covered !== line_coverage[index - 1]) {
				let last_chunk = chunks.at(-1)!
				last_chunk.end_line = index
				last_chunk.size = index - last_chunk.start_line

				chunks.push({
					start_line: index,
					is_covered: is_covered === 1,
					end_line: index,
					size: 0
				})
			}
		}

		let last_chunk = chunks.at(-1)!
		last_chunk.size = line_coverage.length - last_chunk.start_line

		return chunks
	})

[bartveneman]

fixed in #18