use node.prelude/block.children.size instead of walking rules separately (#235)

Author: bartveneman

benchmark/readme.md

@@ -2,17 +2,16 @@
 
 ## Running time
 
-```
 Bol.com                  468 kB  114ms  4.11 MB/s
-Bootstrap 5.0.0          195 kB   48ms  4.06 MB/s
-CNN                     1.77 MB  380ms  4.65 MB/s
+Bootstrap 5.0.0          195 kB   47ms  4.14 MB/s
+CNN                     1.77 MB  359ms  4.92 MB/s
 CSS-Tricks               195 kB   50ms   3.9 MB/s
-Facebook.com             268 kB   71ms  3.78 MB/s
-GitHub.com               514 kB   92ms  5.59 MB/s
-Gazelle.nl               972 kB  296ms  3.28 MB/s
-Lego.com                 246 kB   57ms  4.31 MB/s
-Smashing Magazine.com    1.1 MB  288ms  3.83 MB/s
-Trello.com               312 kB   75ms  4.15 MB/s
+Facebook.com             268 kB   67ms  4.01 MB/s
+GitHub.com               514 kB   90ms  5.71 MB/s
+Gazelle.nl               972 kB  293ms  3.32 MB/s
+Lego.com                 246 kB   53ms  4.64 MB/s
+Smashing Magazine.com    1.1 MB  279ms  3.95 MB/s
+Trello.com               312 kB   77ms  4.05 MB/s
 ```
 
 ## Parsing vs. analyzing
@@ -23,14 +22,14 @@ Trello.com               312 kB   75ms  4.15 MB/s
 =====================================================================
 File                    |    Size |  total | parse | Analyze        |
 =====================================================================
-Bol.com                 |  468 kB |  340ms | 206ms |  133ms (39.1%) |
-Bootstrap 5.0.0         |  195 kB |  128ms |  91ms |   37ms (28.9%) |
-CNN                     | 1.77 MB |  577ms | 375ms |  200ms (34.7%) |
-CSS-Tricks              |  195 kB |  110ms |  72ms |   35ms (31.8%) |
-Facebook.com            |  268 kB |  101ms |  42ms |   58ms (57.4%) |
-GitHub.com              |  514 kB |  120ms |  52ms |   66ms (55.0%) |
-Gazelle.nl              |  972 kB |  322ms | 208ms |  109ms (33.9%) |
-Lego.com                |  246 kB |   65ms |  38ms |   26ms (40.0%) |
-Smashing Magazine.com   |  1.1 MB |  311ms | 166ms |  144ms (46.3%) |
-Trello.com              |  312 kB |   87ms |  48ms |   38ms (43.7%) |
+Bol.com                 |  468 kB |  322ms | 203ms |  119ms (37.0%) |
+Bootstrap 5.0.0         |  195 kB |  131ms |  95ms |   35ms (26.7%) |
+CNN                     | 1.77 MB |  588ms | 402ms |  184ms (31.3%) |
+CSS-Tricks              |  195 kB |  110ms |  72ms |   36ms (32.7%) |
+Facebook.com            |  268 kB |   99ms |  44ms |   55ms (55.6%) |
+GitHub.com              |  514 kB |  122ms |  57ms |   64ms (52.5%) |
+Gazelle.nl              |  972 kB |  319ms | 217ms |   98ms (30.7%) |
+Lego.com                |  246 kB |   62ms |  38ms |   24ms (38.7%) |
+Smashing Magazine.com   |  1.1 MB |  313ms | 164ms |  148ms (47.3%) |
+Trello.com              |  312 kB |   82ms |  46ms |   35ms (42.7%) |
 ```

src/__fixtures__/cnn-20220403.json

@@ -12000,11 +12000,11 @@
     "declarations": {
       "min": 0,
       "max": 31,
-      "mean": 2.5101573938506587,
+      "mean": 2.510340409956076,
       "mode": 1,
       "median": 1,
       "range": 31,
-      "sum": 27431,
+      "sum": 27433,
       "items": [
         2,
         1,
@@ -12980,7 +12980,7 @@
         1,
         1,
         1,
-        11,
+        12,
         1,
         1,
         6,
@@ -13229,7 +13229,7 @@
         1,
         5,
         1,
-        5,
+        6,
         1,
         6,
         8,

src/index.js

@@ -1,6 +1,5 @@
 import parse from 'css-tree/parser'
 import walk from 'css-tree/walker'
-import { analyzeRule } from './rules/rules.js'
 import { analyzeSpecificity, compareSpecificity } from './selectors/specificity.js'
 import { colorFunctions, colorNames } from './values/colors.js'
 import { isFontFamilyKeyword, getFamilyFromFont } from './values/font-families.js'
@@ -200,7 +199,8 @@ const analyze = (css) => {
         break
       }
       case 'Rule': {
-        const [numSelectors, numDeclarations] = analyzeRule(node)
+        const numSelectors = node.prelude.children ? node.prelude.children.size : 0
+        const numDeclarations = node.block.children ? node.block.children.size : 0
 
         totalRules++