url: speed up URLPattern

[anonrig]

This speeds up WHATWG URLPattern constructor, test(), and exec() without changing observable behavior.

Independent of the new URL() parse PR (#65361) and the URLSearchParams PR (#65363).

What changed

C++ only (src/node_url_pattern.cc):

• String input: copy one-byte ASCII V8 strings with ValueView + memcpy into a stack buffer and pass a string_view into Ada. Drop the extra std::string copy that BufferValue/Utf8Value::ToString() used to make. Non-ASCII still goes through Utf8Value.
• Object init: look up the nine interned component keys and assign fields by index. Skip UTF-8-converting each key name and the string-compare chain. Non-string members are still ignored.
• Regexp provider: convert pattern/input strings with ToV8Value and use isolate->GetCurrentContext() instead of Environment::GetCurrent.
• test / exec: share argument parsing so both paths keep the same WebIDL null/undefined/"null" baseURL behavior.

Ada still owns its parsed state; string_views only live for the duration of the C++ call. ValueView is destroyed before any V8 heap allocation.

Tests

• test/parallel/test-urlpattern.js, test-urlpattern-types.js, test-urlpattern-invalidthis.js, and test-urlpattern-fast-path.js all pass
• WPT test/wpt/test-urlpattern.js: 743 passed, 0 unexpected failures

Review follow-up

• Dropped the local NewStringFromUtf8View helper in favor of ToV8Value
• CopyV8StringToBuffer takes a pointer, matching project convention for mutating arguments
• Author and Signed-off-by are Yagiz Nizipli (human DCO)

Assisted-by: Cursor

[nodejs-github-bot]

Review requested:

• @nodejs/url

[jasnell]

AI agents are not permitted to use Signed-off-by

[jasnell]

We already have ToV8Value that takes an std::string_view

[anonrig]

Switched these call sites to ToV8Value and dropped the local helper.

[jasnell]

Project convention is to pass pointers when mutating and to only pass refs as const ref

[anonrig]

CopyV8StringToBuffer now takes MaybeStackBuffer<char>*.

[codecov]

Codecov Report

❌ Patch coverage is 91.15044% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.13%. Comparing base (f83e7df) to head (b1e8b1d).
⚠️ Report is 58 commits behind head on main.

Files with missing lines	Patch %	Lines
src/node_url_pattern.cc	91.15%	1 Missing and 9 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #65364      +/-   ##
==========================================
- Coverage   90.31%   90.13%   -0.19%     
==========================================
  Files         751      752       +1     
  Lines      249956   251852    +1896     
  Branches    47204    47354     +150     
==========================================
+ Hits       225745   227002    +1257     
- Misses      15612    16175     +563     
- Partials     8599     8675      +76     

Files with missing lines	Coverage Δ
src/node_url_pattern.cc	83.84% <91.15%> (+0.12%)	⬆️

... and 91 files with indirect coverage changes

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[anonrig]

Removed the Signed-off-by trailer from the commit(s). An AI agent cannot attest the DCO.