perf: inline is_ident_char() in hot tokenizer loops via CHAR_IDENT bi…

[bartveneman]

…tmask

Add CHAR_IDENT (1 << 5) to the lookup table and replace all 4 is_ident_char() callsites in tight loops with a direct bitmask check, eliminating the 3-function call chain (is_ident_char → is_ident_start → is_alpha) on every character scanned.

Benchmark results vs main:

• Tokenizer - Large CSS: 29,920 → 32,064 ops/sec (+7.2%)
• Tokenizer - Bootstrap CSS: 356 → 401 ops/sec (+12.6%)
• Tokenizer - Tailwind CSS: 28 → 31 ops/sec (+10.7%)
• Parser - Large CSS: 18,801 → 19,908 ops/sec (+5.9%)
• Parser - Bootstrap CSS: 231 → 244 ops/sec (+5.6%)
• Parser - Tailwind CSS: 17 → 18 ops/sec (+5.9%)
• Parse/walk - Bootstrap CSS: 204 → 215 ops/sec (+5.4%)
• Parse/walk - Tailwind CSS: 15 → 16 ops/sec (+6.7%)

[codecov-commenter]

Bundle Report

Changes will increase total bundle size by 235 bytes (0.16%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
@projectwallace/css-parser-esm	146.94kB	235 bytes (0.16%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: @projectwallace/css-parser-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
tokenize.js	231 bytes	19.13kB	1.22%
char-*.js	4 bytes	1.46kB	0.27%

Files in tokenize.js:

• ./src/tokenize.ts → Total Size: 18.53kB

Files in char-*.js:

• ./src/char-types.ts → Total Size: 1.3kB

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.71%. Comparing base (557e0d7) to head (c315eeb).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #149      +/-   ##
==========================================
- Coverage   94.87%   94.71%   -0.17%     
==========================================
  Files          16       16              
  Lines        2714     2726      +12     
  Branches      712      713       +1     
==========================================
+ Hits         2575     2582       +7     
- Misses        139      144       +5     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.