moonbitlang / core / 1461

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main: 96%

Pull #2808

github

feat(builtin): Add StringBuilder::write_stringview method

Add a new method to write StringView directly to StringBuilder without
intermediate string conversions.

Key changes:
- Added write_stringview() accepting StringView parameter
- Fixed length calculation bug (end - start, not just end)
- Added comprehensive documentation with examples
- Enhanced test coverage with edge cases

Implementation details:
- Uses intrinsic accessors for str(), start(), end()
- Delegates to write_substring() with proper length
- No intermediate allocations needed

Performance benefits:
- Avoids string conversion overhead
- Direct write from viewed portion
- More efficient for string slicing operations

Testing (all 5638 tests pass):
- Basic substring write
- Multiple consecutive writes
- Empty view edge case
- Full string view
- ASCII-only strings

API addition:
- StringBuilder::write_stringview(StringView) -> Unit

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