fix: preserve newlines in block comments to match JavaScript behavior

[Boshen]

Summary

Fixes the Rust implementation to preserve newlines (\n and \r) within block comments, matching the behavior of the JavaScript sindresorhus/strip-json-comments library.

Changes

Block Comments

• Modified consume_block_comments() to iterate through characters and only replace non-newline characters with spaces
• Updated maybe_comment_end() to preserve \n and \r characters

Line Comments

• Modified consume_line_comments() to preserve \r when it appears immediately before \n (Windows line endings \r\n)

Test Results

All 48 tests pass, including the ported tests from sindresorhus that now correctly expect newlines to be preserved.

Before:

strip_string("{\"a\"/*\n\n\ncomment\r\n*/:\"b\"}")
// Output: "{\"a\"                :\"b\"}"  // newlines replaced with spaces ❌

After:

strip_string("{\"a\"/*\n\n\ncomment\r\n*/:\"b\"}")
// Output: "{\"a\"  \n\n\n       \r\n  :\"b\"}"  // newlines preserved ✅

Related

Builds on #118 which ported the test suite from the JavaScript implementation.

🤖 Generated with Claude Code

[codspeed-hq]

CodSpeed Performance Report

Merging #120 will degrade performances by 18.87%

_{Comparing fix/preserve-newlines-in-comments (5d255b2) with main (eab81e0)}

Summary

❌ 4 regressions

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	large_with_comments	58.2 µs	68.5 µs	-15.08%
❌	minimal_comments	2.4 µs	3 µs	-18.87%
❌	no_comments	3.9 µs	4.3 µs	-9.41%
❌	tsconfig	19.2 µs	21.4 µs	-10.43%