Fast path optimization and reduce the data (#108)

cometkim · web-flow · commit 8b23df995c25 · 2025-12-15T07:16:34.000+09:00
diff --git a/.changeset/wild-candles-count.md b/.changeset/wild-candles-count.md
@@ -0,0 +1,19 @@
+---
+"unicode-segmenter": patch
+---
+
+Two further optimizations:
+
+1. Remove inlined ranges from the data file.
+2. Add inlined range: 0xAC00-0xD7A3 (Hangul syllables) can easily be inlined.
+
+The 1 is something I forgot in #104 task, but it was a slight chance.
+
+Btw, the number 2 is a huge finding. It is a pretty extensive range to be newly inlined.
+Applying both optimizations significantly reduced the bundle size and memory footprint.
+
+- Size(min): 12,549 bytes -> 6,846 bytes (-45.5%)
+- Size(min+gz): 5,314 bytes -> 3,449 bytes (-35.1%)
+- Index memory usage: 14,272 bytes -> 8,686 bytes (-39.2%)
+
+Of course, without perf regression.
diff --git a/README.md b/README.md
@@ -215,7 +215,7 @@ Since [Hermes doesn't support the `Intl.Segmenter` API](https://github.com/faceb
 
 | Name                         | Unicode® | ESM? |   Size    | Size (min) | Size (min+gzip) | Size (min+br) | Size (min+zstd) |
 |------------------------------|----------|------|----------:|-----------:|----------------:|--------------:|----------------:|
-| `unicode-segmenter/grapheme` |   16.0.0 |   ✔️ |    16,685 |     12,549 |           5,314 |         3,952 |           5,012 |
+| `unicode-segmenter/grapheme` |   16.0.0 |   ✔️ |    11,272 |      6,846 |           3,449 |         2,803 |           3,564 |
 | `graphemer`                  |   15.0.0 |   ✖️ ️|   410,435 |     95,104 |          15,752 |        10,660 |          15,911 |
 | `grapheme-splitter`          |   10.0.0 |   ✖️ |   122,254 |     23,682 |           7,852 |         4,802 |           6,753 |
 | `@formatjs/intl-segmenter`*  |   15.0.0 |   ✖️ |   603,510 |    369,673 |          72,273 |        49,530 |          68,027 |
@@ -231,7 +231,7 @@ Since [Hermes doesn't support the `Intl.Segmenter` API](https://github.com/faceb
 
 | Name                         | Bytecode size | Bytecode size (gzip)* |
 |------------------------------|--------------:|----------------------:|
-| `unicode-segmenter/grapheme` |        26,278 |                13,797 |
+| `unicode-segmenter/grapheme` |        20,619 |                11,619 |
 | `graphemer`                  |       134,089 |                31,766 |
 | `grapheme-splitter`          |        63,946 |                19,162 |
 
diff --git a/scripts/unicode.js b/scripts/unicode.js
@@ -491,8 +491,9 @@ import { decodeUnicodeData } from './core.js';
 /**
  * Grapheme category enum
  *
- * Note: The enum object is not actually \`Object.freeze\`
- * because it increases 800 bytes of Brotli compression... Not sure why :P
+ * Note:
+ *   The object isn't actually frozen
+ *   because using \`Object.freeze\` increases 800 bytes on Brotli compression.
  *
  * @type {Readonly<Record<${keyTypeName}, ${numTypeName}>>}
  */
@@ -843,11 +844,28 @@ for (let chars of graphemeTable) {
 // }
 // sentenceTable.sort((a, b) => a[0] - b[0]);
 
+// Filter out ranges handled by inlined fast paths in cat()
+let graphemeTableOptimized = graphemeTable.filter(([from, to, cat]) => {
+  // CJK fast path: 0x3000-0x9FFF (inlined in cat())
+  if (from >= 0x3000 && to <= 0x9FFF) {
+    return false;
+  }
+  // Hangul syllables (LV/LVT): computed at runtime
+  if (from >= 0xAC00 && to <= 0xD7A3 && (cat === 'LV' || cat === 'LVT')) {
+    return false;
+  }
+  // Private Use fast path: 0xE000-0xFDFF (inlined in cat())
+  if (from >= 0xE000 && to < 0xFE00) {
+    return false;
+  }
+  return true;
+});
+
 await emitSrc(
   '_grapheme_data.js',
   async f => printBreakModule(
     f,
-    graphemeTable,
+    graphemeTableOptimized,
     Object.keys(graphemeCats).concat(['Extended_Pictographic']),
     'grapheme',
   ),
diff --git a/src/_grapheme_data.js b/src/_grapheme_data.js
@@ -100,6 +100,6 @@ export const GraphemeCategory = {
  */
 export const grapheme_ranges = decodeUnicodeData(
   /** @type {UnicodeDataEncoding} */
-  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,,133h,q,1348,,1349,q,1350,,1351,q,135s,,135t,q,136k,,136l,q,137c,,137d,q,1384,,1385,q,138w,,138x,q,139o,,139p,q,13ag,,13ah,q,13b8,,13b9,q,13c0,,13c1,q,13cs,,13ct,q,13dk,,13dl,q,13ec,,13ed,q,13f4,,13f5,q,13fw,,13fx,q,13go,,13gp,q,13hg,,13hh,q,13i8,,13i9,q,13j0,,13j1,q,13js,,13jt,q,13kk,,13kl,q,13lc,,13ld,q,13m4,,13m5,q,13mw,,13mx,q,13no,,13np,q,13og,,13oh,q,13p8,,13p9,q,13q0,,13q1,q,13qs,,13qt,q,13rk,,13rl,q,13sc,,13sd,q,13t4,,13t5,q,13tw,,13tx,q,13uo,,13up,q,13vg,,13vh,q,13w8,,13w9,q,13x0,,13x1,q,13xs,,13xt,q,13yk,,13yl,q,13zc,,13zd,q,1404,,1405,q,140w,,140x,q,141o,,141p,q,142g,,142h,q,1438,,1439,q,1440,,1441,q,144s,,144t,q,145k,,145l,q,146c,,146d,q,1474,,1475,q,147w,,147x,q,148o,,148p,q,149g,,149h,q,14a8,,14a9,q,14b0,,14b1,q,14bs,,14bt,q,14ck,,14cl,q,14dc,,14dd,q,14e4,,14e5,q,14ew,,14ex,q,14fo,,14fp,q,14gg,,14gh,q,14h8,,14h9,q,14i0,,14i1,q,14is,,14it,q,14jk,,14jl,q,14kc,,14kd,q,14l4,,14l5,q,14lw,,14lx,q,14mo,,14mp,q,14ng,,14nh,q,14o8,,14o9,q,14p0,,14p1,q,14ps,,14pt,q,14qk,,14ql,q,14rc,,14rd,q,14s4,,14s5,q,14sw,,14sx,q,14to,,14tp,q,14ug,,14uh,q,14v8,,14v9,q,14w0,,14w1,q,14ws,,14wt,q,14xk,,14xl,q,14yc,,14yd,q,14z4,,14z5,q,14zw,,14zx,q,150o,,150p,q,151g,,151h,q,1528,,1529,q,1530,,1531,q,153s,,153t,q,154k,,154l,q,155c,,155d,q,1564,,1565,q,156w,,156x,q,157o,,157p,q,158g,,158h,q,1598,,1599,q,15a0,,15a1,q,15as,,15at,q,15bk,,15bl,q,15cc,,15cd,q,15d4,,15d5,q,15dw,,15dx,q,15eo,,15ep,q,15fg,,15fh,q,15g8,,15g9,q,15h0,,15h1,q,15hs,,15ht,q,15ik,,15il,q,15jc,,15jd,q,15k4,,15k5,q,15kw,,15kx,q,15lo,,15lp,q,15mg,,15mh,q,15n8,,15n9,q,15o0,,15o1,q,15os,,15ot,q,15pk,,15pl,q,15qc,,15qd,q,15r4,,15r5,q,15rw,,15rx,q,15so,,15sp,q,15tg,,15th,q,15u8,,15u9,q,15v0,,15v1,q,15vs,,15vt,q,15wk,,15wl,q,15xc,,15xd,q,15y4,,15y5,q,15yw,,15yx,q,15zo,,15zp,q,160g,,160h,q,1618,,1619,q,1620,,1621,q,162s,,162t,q,163k,,163l,q,164c,,164d,q,1654,,1655,q,165w,,165x,q,166o,,166p,q,167g,,167h,q,1688,,1689,q,1690,,1691,q,169s,,169t,q,16ak,,16al,q,16bc,,16bd,q,16c4,,16c5,q,16cw,,16cx,q,16do,,16dp,q,16eg,,16eh,q,16f8,,16f9,q,16g0,,16g1,q,16gs,,16gt,q,16hk,,16hl,q,16ic,,16id,q,16j4,,16j5,q,16jw,,16jx,q,16ko,,16kp,q,16ls,m,16mj,1c,1dlq,,1e68,f,1e74,f,1edb,,1ehq,1,1ek0,b,1eyl,,1f4w,,1f92,4,1gjl,2,1gjp,1,1gjw,3,1gl4,2,1glb,,1gpx,1,1h5w,3,1h7t,4,1hgr,1,1hj0,3,1hl2,a,1hmq,3,1hq8,,1hq9,,1hqa,,1hrs,e,1htc,,1htf,1,1htr,2,1htu,,1hv4,2,1hv7,3,1hvb,1,1hvd,1,1hvh,,1hvm,,1hvx,,1hxc,2,1hyf,4,1hyk,,1hyl,7,1hz9,1,1i0j,,1i0w,1,1i0y,,1i2b,2,1i2e,8,1i2n,,1i2o,,1i2q,1,1i2x,3,1i32,,1i33,,1i5o,2,1i5r,2,1i5u,1,1i5w,3,1i66,,1i69,,1ian,,1iao,2,1iar,7,1ibk,1,1ibm,1,1id7,1,1ida,,1idb,,1idc,,1idd,3,1idj,1,1idn,1,1idp,,1idz,,1iea,1,1iee,6,1ieo,4,1igo,,1igp,1,1igr,5,1igy,,1ih1,,1ih3,2,1ih6,,1ih8,1,1iha,2,1ihd,,1ihe,,1iht,1,1ik5,2,1ik8,7,1ikg,1,1iki,2,1ikl,,1ikm,,1ila,,1ink,,1inl,1,1inn,5,1int,,1inu,,1inv,1,1inx,,1iny,,1inz,1,1io1,,1io2,1,1iun,,1iuo,1,1iuq,3,1iuw,3,1iv0,1,1iv2,,1iv3,1,1ivw,1,1iy8,2,1iyb,7,1iyj,1,1iyl,,1iym,,1iyn,1,1j1n,,1j1o,,1j1p,,1j1q,1,1j1s,7,1j4t,,1j4u,,1j4v,,1j4y,3,1j52,,1j53,4,1jcc,2,1jcf,8,1jco,,1jcp,1,1jjk,,1jjl,4,1jjr,1,1jjv,3,1jjz,,1jk0,,1jk1,,1jk2,,1jk3,,1jo1,2,1jo4,3,1joa,1,1joc,3,1jog,,1jok,,1jpd,9,1jqr,5,1jqx,,1jqy,,1jqz,3,1jrb,,1jrl,5,1jrr,1,1jrt,2,1jt0,5,1jt6,c,1jtj,,1jtk,1,1k4v,,1k4w,6,1k54,5,1k5a,,1k5b,,1k7m,l,1k89,,1k8a,6,1k8h,,1k8i,1,1k8k,,1k8l,1,1kc1,5,1kca,,1kcc,1,1kcf,6,1kcm,,1kcn,,1kei,4,1keo,1,1ker,1,1ket,,1keu,,1kev,,1koj,1,1kol,1,1kow,1,1koy,,1koz,,1kqc,1,1kqe,4,1kqm,1,1kqo,2,1kre,,1ovk,f,1ow0,,1ow7,e,1xr2,b,1xre,2,1xrh,2,1zow,4,1zqo,6,206b,,206f,3,20jz,,20k1,1i,20lr,3,20o4,,20og,1,2ftp,1,2fts,3,2jgg,19,2jhs,m,2jxh,4,2jxp,5,2jxv,7,2jy3,7,2jyd,6,2jze,3,2k3m,2,2lmo,1i,2lob,1d,2lpx,,2lqc,,2lqz,4,2lr5,e,2mtc,6,2mtk,g,2mu3,6,2mub,1,2mue,4,2mxb,,2n1s,6,2nce,,2ne4,3,2nsc,3,2nzi,1,2ok0,6,2on8,6,2pz4,73,2q6l,2,2q7j,,2q98,5,2q9q,1,2qa6,,2qa9,9,2qb1,1k,2qcm,p,2qdd,e,2qe2,,2qen,,2qeq,8,2qf0,3,2qfd,c1,2qrf,4,2qrk,8t,2r0m,7d,2r9c,3j,2rg4,b,2rit,16,2rkc,3,2rm0,7,2rmi,5,2rns,7,2rou,29,2rrg,1a,2rss,9,2rt3,c8,2scg,sd,jny8,v,jnz4,2n,jo1s,3j,jo5c,6n,joc0,2rz'),
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 );
diff --git a/src/grapheme.js b/src/grapheme.js
