From 5bf215a3901c4cf9eb5fe4129d1577acccd3921e Mon Sep 17 00:00:00 2001
From: Romain Menke <11521496+romainmenke@users.noreply.github.com>
Date: Thu, 23 Nov 2023 18:01:55 +0100
Subject: [PATCH] specificity: `:active-view-transition` (#1180)

---
 packages/selector-specificity/CHANGELOG.md   |  6 +++
 packages/selector-specificity/dist/index.cjs |  2 +-
 packages/selector-specificity/dist/index.mjs |  2 +-
 packages/selector-specificity/src/index.ts   | 54 ++++++++++++++------
 packages/selector-specificity/test/test.mjs  |  9 ++++
 5 files changed, 55 insertions(+), 18 deletions(-)

diff --git a/packages/selector-specificity/CHANGELOG.md b/packages/selector-specificity/CHANGELOG.md
index 770a6b9fa..cda6afd42 100644
--- a/packages/selector-specificity/CHANGELOG.md
+++ b/packages/selector-specificity/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changes to Selector Specificity
 
+### Unreleased (patch)
+
+- Add support for:
+	- `:active-view-transition(*)`
+	- `:active-view-transition(name)`
+
 ### 3.0.0
 
 _July 3, 2023_
diff --git a/packages/selector-specificity/dist/index.cjs b/packages/selector-specificity/dist/index.cjs
index 4633d0fc3..7139faff7 100644
--- a/packages/selector-specificity/dist/index.cjs
+++ b/packages/selector-specificity/dist/index.cjs
@@ -1 +1 @@
-"use strict";var e=require("postcss-selector-parser");const s=/[A-Z]/g;function toLowerCaseAZ(e){return e.replace(s,(e=>String.fromCharCode(e.charCodeAt(0)+32)))}function selectorSpecificity(s){if(!s)return{a:0,b:0,c:0};let t=0,c=0,i=0;if("universal"==s.type)return{a:0,b:0,c:0};if("id"===s.type)t+=1;else if("tag"===s.type)i+=1;else if("class"===s.type)c+=1;else if("attribute"===s.type)c+=1;else if(isPseudoElement(s))switch(toLowerCaseAZ(s.value)){case"::slotted":if(i+=1,s.nodes&&s.nodes.length>0){const e=specificityOfMostSpecificListItem(s.nodes);t+=e.a,c+=e.b,i+=e.c}break;case"::view-transition-group":case"::view-transition-image-pair":case"::view-transition-old":case"::view-transition-new":if(s.nodes&&1===s.nodes.length&&"selector"===s.nodes[0].type&&selectorNodeContainsOnlyUniversal(s.nodes[0]))return{a:0,b:0,c:0};i+=1;break;default:i+=1}else if(e.isPseudoClass(s))switch(toLowerCaseAZ(s.value)){case":-moz-any":case":-webkit-any":case":any":case":has":case":is":case":matches":case":not":if(s.nodes&&s.nodes.length>0){const e=specificityOfMostSpecificListItem(s.nodes);t+=e.a,c+=e.b,i+=e.c}break;case":where":break;case":nth-child":case":nth-last-child":if(c+=1,s.nodes&&s.nodes.length>0){const n=s.nodes[0].nodes.findIndex((e=>"tag"===e.type&&"of"===toLowerCaseAZ(e.value)));if(n>-1){const o=[e.selector({nodes:s.nodes[0].nodes.slice(n+1),value:""})];s.nodes.length>1&&o.push(...s.nodes.slice(1));const a=specificityOfMostSpecificListItem(o);t+=a.a,c+=a.b,i+=a.c}}break;case":local":case":global":s.nodes&&s.nodes.length>0&&s.nodes.forEach((e=>{const s=selectorSpecificity(e);t+=s.a,c+=s.b,i+=s.c}));break;case":host":case":host-context":if(c+=1,s.nodes&&s.nodes.length>0){const e=specificityOfMostSpecificListItem(s.nodes);t+=e.a,c+=e.b,i+=e.c}break;default:c+=1}else e.isContainer(s)&&s.nodes.length>0&&s.nodes.forEach((e=>{const s=selectorSpecificity(e);t+=s.a,c+=s.b,i+=s.c}));return{a:t,b:c,c:i}}function specificityOfMostSpecificListItem(e){let s={a:0,b:0,c:0};return e.forEach((e=>{const t=selectorSpecificity(e);t.a>s.a?s=t:t.a<s.a||(t.b>s.b?s=t:t.b<s.b||t.c>s.c&&(s=t))})),s}function isPseudoElement(s){return e.isPseudoElement(s)}function selectorNodeContainsOnlyUniversal(e){if(!e)return!1;if(!e.nodes)return!1;const s=e.nodes.filter((e=>"comment"!==e.type));return 1===s.length&&"universal"===s[0].type}exports.compare=function compare(e,s){return e.a===s.a?e.b===s.b?e.c-s.c:e.b-s.b:e.a-s.a},exports.selectorSpecificity=selectorSpecificity;
+"use strict";var e=require("postcss-selector-parser");const s=/[A-Z]/g;function toLowerCaseAZ(e){return e.replace(s,(e=>String.fromCharCode(e.charCodeAt(0)+32)))}function selectorSpecificity(s){if(!s)return{a:0,b:0,c:0};let t=0,c=0,n=0;if("universal"==s.type)return{a:0,b:0,c:0};if("id"===s.type)t+=1;else if("tag"===s.type)n+=1;else if("class"===s.type)c+=1;else if("attribute"===s.type)c+=1;else if(isPseudoElement(s))switch(toLowerCaseAZ(s.value)){case"::slotted":if(n+=1,s.nodes&&s.nodes.length>0){const e=specificityOfMostSpecificListItem(s.nodes);t+=e.a,c+=e.b,n+=e.c}break;case"::view-transition-group":case"::view-transition-image-pair":case"::view-transition-old":case"::view-transition-new":return s.nodes&&1===s.nodes.length&&"selector"===s.nodes[0].type&&selectorNodeContainsOnlyUniversal(s.nodes[0])?{a:0,b:0,c:0}:{a:0,b:0,c:1};default:n+=1}else if(e.isPseudoClass(s))switch(toLowerCaseAZ(s.value)){case":-moz-any":case":-webkit-any":case":any":case":has":case":is":case":matches":case":not":if(s.nodes&&s.nodes.length>0){const e=specificityOfMostSpecificListItem(s.nodes);t+=e.a,c+=e.b,n+=e.c}break;case":where":break;case":nth-child":case":nth-last-child":if(c+=1,s.nodes&&s.nodes.length>0){const i=s.nodes[0].nodes.findIndex((e=>"tag"===e.type&&"of"===toLowerCaseAZ(e.value)));if(i>-1){const o=[e.selector({nodes:s.nodes[0].nodes.slice(i+1),value:""})];s.nodes.length>1&&o.push(...s.nodes.slice(1));const a=specificityOfMostSpecificListItem(o);t+=a.a,c+=a.b,n+=a.c}}break;case":local":case":global":s.nodes&&s.nodes.length>0&&s.nodes.forEach((e=>{const s=selectorSpecificity(e);t+=s.a,c+=s.b,n+=s.c}));break;case":host":case":host-context":if(c+=1,s.nodes&&s.nodes.length>0){const e=specificityOfMostSpecificListItem(s.nodes);t+=e.a,c+=e.b,n+=e.c}break;case":active-view-transition":return s.nodes&&1===s.nodes.length&&"selector"===s.nodes[0].type&&selectorNodeContainsOnlyUniversal(s.nodes[0])?{a:0,b:1,c:0}:{a:0,b:2,c:0};default:c+=1}else e.isContainer(s)&&s.nodes.length>0&&s.nodes.forEach((e=>{const s=selectorSpecificity(e);t+=s.a,c+=s.b,n+=s.c}));return{a:t,b:c,c:n}}function specificityOfMostSpecificListItem(e){let s={a:0,b:0,c:0};return e.forEach((e=>{const t=selectorSpecificity(e);t.a>s.a?s=t:t.a<s.a||(t.b>s.b?s=t:t.b<s.b||t.c>s.c&&(s=t))})),s}function isPseudoElement(s){return e.isPseudoElement(s)}function selectorNodeContainsOnlyUniversal(e){if(!e)return!1;if(!e.nodes)return!1;const s=e.nodes.filter((e=>"comment"!==e.type));return 1===s.length&&"universal"===s[0].type}exports.compare=function compare(e,s){return e.a===s.a?e.b===s.b?e.c-s.c:e.b-s.b:e.a-s.a},exports.selectorSpecificity=selectorSpecificity;
diff --git a/packages/selector-specificity/dist/index.mjs b/packages/selector-specificity/dist/index.mjs
index 8ac79c745..83be7cda6 100644
--- a/packages/selector-specificity/dist/index.mjs
+++ b/packages/selector-specificity/dist/index.mjs
@@ -1 +1 @@
-import e from"postcss-selector-parser";const s=/[A-Z]/g;function toLowerCaseAZ(e){return e.replace(s,(e=>String.fromCharCode(e.charCodeAt(0)+32)))}function compare(e,s){return e.a===s.a?e.b===s.b?e.c-s.c:e.b-s.b:e.a-s.a}function selectorSpecificity(s){if(!s)return{a:0,b:0,c:0};let t=0,c=0,i=0;if("universal"==s.type)return{a:0,b:0,c:0};if("id"===s.type)t+=1;else if("tag"===s.type)i+=1;else if("class"===s.type)c+=1;else if("attribute"===s.type)c+=1;else if(isPseudoElement(s))switch(toLowerCaseAZ(s.value)){case"::slotted":if(i+=1,s.nodes&&s.nodes.length>0){const e=specificityOfMostSpecificListItem(s.nodes);t+=e.a,c+=e.b,i+=e.c}break;case"::view-transition-group":case"::view-transition-image-pair":case"::view-transition-old":case"::view-transition-new":if(s.nodes&&1===s.nodes.length&&"selector"===s.nodes[0].type&&selectorNodeContainsOnlyUniversal(s.nodes[0]))return{a:0,b:0,c:0};i+=1;break;default:i+=1}else if(e.isPseudoClass(s))switch(toLowerCaseAZ(s.value)){case":-moz-any":case":-webkit-any":case":any":case":has":case":is":case":matches":case":not":if(s.nodes&&s.nodes.length>0){const e=specificityOfMostSpecificListItem(s.nodes);t+=e.a,c+=e.b,i+=e.c}break;case":where":break;case":nth-child":case":nth-last-child":if(c+=1,s.nodes&&s.nodes.length>0){const n=s.nodes[0].nodes.findIndex((e=>"tag"===e.type&&"of"===toLowerCaseAZ(e.value)));if(n>-1){const o=[e.selector({nodes:s.nodes[0].nodes.slice(n+1),value:""})];s.nodes.length>1&&o.push(...s.nodes.slice(1));const a=specificityOfMostSpecificListItem(o);t+=a.a,c+=a.b,i+=a.c}}break;case":local":case":global":s.nodes&&s.nodes.length>0&&s.nodes.forEach((e=>{const s=selectorSpecificity(e);t+=s.a,c+=s.b,i+=s.c}));break;case":host":case":host-context":if(c+=1,s.nodes&&s.nodes.length>0){const e=specificityOfMostSpecificListItem(s.nodes);t+=e.a,c+=e.b,i+=e.c}break;default:c+=1}else e.isContainer(s)&&s.nodes.length>0&&s.nodes.forEach((e=>{const s=selectorSpecificity(e);t+=s.a,c+=s.b,i+=s.c}));return{a:t,b:c,c:i}}function specificityOfMostSpecificListItem(e){let s={a:0,b:0,c:0};return e.forEach((e=>{const t=selectorSpecificity(e);t.a>s.a?s=t:t.a<s.a||(t.b>s.b?s=t:t.b<s.b||t.c>s.c&&(s=t))})),s}function isPseudoElement(s){return e.isPseudoElement(s)}function selectorNodeContainsOnlyUniversal(e){if(!e)return!1;if(!e.nodes)return!1;const s=e.nodes.filter((e=>"comment"!==e.type));return 1===s.length&&"universal"===s[0].type}export{compare,selectorSpecificity};
+import e from"postcss-selector-parser";const s=/[A-Z]/g;function toLowerCaseAZ(e){return e.replace(s,(e=>String.fromCharCode(e.charCodeAt(0)+32)))}function compare(e,s){return e.a===s.a?e.b===s.b?e.c-s.c:e.b-s.b:e.a-s.a}function selectorSpecificity(s){if(!s)return{a:0,b:0,c:0};let t=0,n=0,c=0;if("universal"==s.type)return{a:0,b:0,c:0};if("id"===s.type)t+=1;else if("tag"===s.type)c+=1;else if("class"===s.type)n+=1;else if("attribute"===s.type)n+=1;else if(isPseudoElement(s))switch(toLowerCaseAZ(s.value)){case"::slotted":if(c+=1,s.nodes&&s.nodes.length>0){const e=specificityOfMostSpecificListItem(s.nodes);t+=e.a,n+=e.b,c+=e.c}break;case"::view-transition-group":case"::view-transition-image-pair":case"::view-transition-old":case"::view-transition-new":return s.nodes&&1===s.nodes.length&&"selector"===s.nodes[0].type&&selectorNodeContainsOnlyUniversal(s.nodes[0])?{a:0,b:0,c:0}:{a:0,b:0,c:1};default:c+=1}else if(e.isPseudoClass(s))switch(toLowerCaseAZ(s.value)){case":-moz-any":case":-webkit-any":case":any":case":has":case":is":case":matches":case":not":if(s.nodes&&s.nodes.length>0){const e=specificityOfMostSpecificListItem(s.nodes);t+=e.a,n+=e.b,c+=e.c}break;case":where":break;case":nth-child":case":nth-last-child":if(n+=1,s.nodes&&s.nodes.length>0){const o=s.nodes[0].nodes.findIndex((e=>"tag"===e.type&&"of"===toLowerCaseAZ(e.value)));if(o>-1){const i=[e.selector({nodes:s.nodes[0].nodes.slice(o+1),value:""})];s.nodes.length>1&&i.push(...s.nodes.slice(1));const a=specificityOfMostSpecificListItem(i);t+=a.a,n+=a.b,c+=a.c}}break;case":local":case":global":s.nodes&&s.nodes.length>0&&s.nodes.forEach((e=>{const s=selectorSpecificity(e);t+=s.a,n+=s.b,c+=s.c}));break;case":host":case":host-context":if(n+=1,s.nodes&&s.nodes.length>0){const e=specificityOfMostSpecificListItem(s.nodes);t+=e.a,n+=e.b,c+=e.c}break;case":active-view-transition":return s.nodes&&1===s.nodes.length&&"selector"===s.nodes[0].type&&selectorNodeContainsOnlyUniversal(s.nodes[0])?{a:0,b:1,c:0}:{a:0,b:2,c:0};default:n+=1}else e.isContainer(s)&&s.nodes.length>0&&s.nodes.forEach((e=>{const s=selectorSpecificity(e);t+=s.a,n+=s.b,c+=s.c}));return{a:t,b:n,c:c}}function specificityOfMostSpecificListItem(e){let s={a:0,b:0,c:0};return e.forEach((e=>{const t=selectorSpecificity(e);t.a>s.a?s=t:t.a<s.a||(t.b>s.b?s=t:t.b<s.b||t.c>s.c&&(s=t))})),s}function isPseudoElement(s){return e.isPseudoElement(s)}function selectorNodeContainsOnlyUniversal(e){if(!e)return!1;if(!e.nodes)return!1;const s=e.nodes.filter((e=>"comment"!==e.type));return 1===s.length&&"universal"===s[0].type}export{compare,selectorSpecificity};
diff --git a/packages/selector-specificity/src/index.ts b/packages/selector-specificity/src/index.ts
index 4885c512b..bb91c95af 100644
--- a/packages/selector-specificity/src/index.ts
+++ b/packages/selector-specificity/src/index.ts
@@ -79,24 +79,24 @@ export function selectorSpecificity(node: Node): Specificity {
 			case '::view-transition-new':
 				// https://drafts.csswg.org/css-view-transitions-1/#named-view-transition-pseudo
 
-				{
-					if (
-						node.nodes &&
-						node.nodes.length === 1 &&
-						node.nodes[0].type === 'selector' &&
-						selectorNodeContainsOnlyUniversal(node.nodes[0])
-					) {
-						return {
-							a: 0,
-							b: 0,
-							c: 0,
-						};
-					} else {
-						c += 1;
-					}
+				if (
+					node.nodes &&
+					node.nodes.length === 1 &&
+					node.nodes[0].type === 'selector' &&
+					selectorNodeContainsOnlyUniversal(node.nodes[0])
+				) {
+					return {
+						a: 0,
+						b: 0,
+						c: 0,
+					};
 				}
 
-				break;
+				return {
+					a: 0,
+					b: 0,
+					c: 1,
+				};
 
 			default:
 				c += 1;
@@ -204,6 +204,28 @@ export function selectorSpecificity(node: Node): Specificity {
 
 				break;
 
+			case ':active-view-transition':
+				// see : https://drafts.csswg.org/css-view-transitions-2/#the-active-view-transition-pseudo
+
+				if (
+					node.nodes &&
+							node.nodes.length === 1 &&
+							node.nodes[0].type === 'selector' &&
+							selectorNodeContainsOnlyUniversal(node.nodes[0])
+				) {
+					return {
+						a: 0,
+						b: 1,
+						c: 0,
+					};
+				}
+
+				return {
+					a: 0,
+					b: 2,
+					c: 0,
+				};
+
 			default:
 				b += 1;
 		}
diff --git a/packages/selector-specificity/test/test.mjs b/packages/selector-specificity/test/test.mjs
index 519e70b67..d6d39a511 100644
--- a/packages/selector-specificity/test/test.mjs
+++ b/packages/selector-specificity/test/test.mjs
@@ -113,3 +113,12 @@ assert.deepEqual(calculate('::view-transition-old(foo)'), { a: 0, b: 0, c: 1 });
 assert.deepEqual(calculate('::view-transition-old(*)'), { a: 0, b: 0, c: 0 });
 assert.deepEqual(calculate('::view-transition-new(foo)'), { a: 0, b: 0, c: 1 });
 assert.deepEqual(calculate('::view-transition-new(*)'), { a: 0, b: 0, c: 0 });
+
+assert.deepEqual(calculate(':active-view-transition(*)'), { a: 0, b: 1, c: 0 });
+assert.deepEqual(calculate(':active-view-transition(foo)'), { a: 0, b: 2, c: 0 });
+assert.deepEqual(calculate(':active-view-transition(foo, bar)'), { a: 0, b: 2, c: 0 });
+
+// Invalid CSS, must be either `*` or a list of one or more custom idents
+// We should still calculate some specificity.
+assert.deepEqual(calculate(':active-view-transition(*, bar)'), { a: 0, b: 2, c: 0 });
+assert.deepEqual(calculate(':active-view-transition(*, *)'), { a: 0, b: 2, c: 0 });