add support for @container

.changeset/two-bears-kick.md

@@ -0,0 +1,5 @@
+---
+"rrweb-cssom": minor
+---
+
+add support for @container

lib/CSSContainerRule.js

@@ -0,0 +1,50 @@
+//.CommonJS
+var CSSOM = {
+	CSSRule: require("./CSSRule").CSSRule,
+	CSSGroupingRule: require("./CSSGroupingRule").CSSGroupingRule,
+	CSSConditionRule: require("./CSSConditionRule").CSSConditionRule,
+};
+///CommonJS
+
+
+/**
+ * @constructor
+ * @see https://drafts.csswg.org/css-contain-3/
+ * @see https://www.w3.org/TR/css-contain-3/
+ */
+CSSOM.CSSContainerRule = function CSSContainerRule() {
+	CSSOM.CSSConditionRule.call(this);
+};
+
+CSSOM.CSSContainerRule.prototype = new CSSOM.CSSConditionRule();
+CSSOM.CSSContainerRule.prototype.constructor = CSSOM.CSSContainerRule;
+CSSOM.CSSContainerRule.prototype.type = 17;
+
+Object.defineProperties(CSSOM.CSSContainerRule.prototype, {
+  "conditionText": {
+    get: function() {
+      return this.containerText;
+    },
+    set: function(value) {
+      this.containerText = value;
+    },
+    configurable: true,
+    enumerable: true
+  },
+  "cssText": {
+    get: function() {
+      var cssTexts = [];
+      for (var i=0, length=this.cssRules.length; i < length; i++) {
+        cssTexts.push(this.cssRules[i].cssText);
+      }
+      return "@container " + this.containerText + " {" + cssTexts.join("") + "}";
+    },
+    configurable: true,
+    enumerable: true
+  }
+});
+
+
+//.CommonJS
+exports.CSSContainerRule = CSSOM.CSSContainerRule;
+///CommonJS

lib/CSSRule.js

@@ -30,6 +30,7 @@ CSSOM.CSSRule.DOCUMENT_RULE = 13;
 CSSOM.CSSRule.FONT_FEATURE_VALUES_RULE = 14;
 CSSOM.CSSRule.VIEWPORT_RULE = 15;
 CSSOM.CSSRule.REGION_STYLE_RULE = 16;
+CSSOM.CSSRule.CONTAINER_RULE = 17;
 CSSOM.CSSRule.STARTING_STYLE_RULE = 1002;
 
 

lib/clone.js

@@ -6,6 +6,7 @@ var CSSOM = {
 	CSSGroupingRule: require("./CSSGroupingRule").CSSGroupingRule,
 	CSSConditionRule: require("./CSSConditionRule").CSSConditionRule,
 	CSSMediaRule: require("./CSSMediaRule").CSSMediaRule,
+	CSSContainerRule: require("./CSSContainerRule").CSSContainerRule,
 	CSSSupportsRule: require("./CSSSupportsRule").CSSSupportsRule,
 	CSSStyleDeclaration: require("./CSSStyleDeclaration").CSSStyleDeclaration,
 	CSSKeyframeRule: require('./CSSKeyframeRule').CSSKeyframeRule,

lib/index.js

@@ -7,6 +7,7 @@ exports.CSSConditionRule = require('./CSSConditionRule').CSSConditionRule;
 exports.CSSStyleRule = require('./CSSStyleRule').CSSStyleRule;
 exports.MediaList = require('./MediaList').MediaList;
 exports.CSSMediaRule = require('./CSSMediaRule').CSSMediaRule;
+exports.CSSContainerRule = require('./CSSContainerRule').CSSContainerRule;
 exports.CSSSupportsRule = require('./CSSSupportsRule').CSSSupportsRule;
 exports.CSSImportRule = require('./CSSImportRule').CSSImportRule;
 exports.CSSFontFaceRule = require('./CSSFontFaceRule').CSSFontFaceRule;

lib/parse.js

@@ -35,23 +35,24 @@ CSSOM.parse = function parse(token) {
 		"importRule-begin": true,
 		"importRule": true,
 		"atBlock": true,
+		"containerBlock": true,
 		"conditionBlock": true,
 		'documentRule-begin': true
 	};
 
 	var styleSheet = new CSSOM.CSSStyleSheet();
 
-	// @type CSSStyleSheet|CSSMediaRule|CSSSupportsRule|CSSFontFaceRule|CSSKeyframesRule|CSSDocumentRule
+	// @type CSSStyleSheet|CSSMediaRule|CSSContainerRule|CSSSupportsRule|CSSFontFaceRule|CSSKeyframesRule|CSSDocumentRule
 	var currentScope = styleSheet;
 
-	// @type CSSMediaRule|CSSSupportsRule|CSSKeyframesRule|CSSDocumentRule
+	// @type CSSMediaRule|CSSContainerRule|CSSSupportsRule|CSSKeyframesRule|CSSDocumentRule
 	var parentRule;
 
 	var ancestorRules = [];
 	var hasAncestors = false;
 	var prevScope;
 
-	var name, priority="", styleRule, mediaRule, supportsRule, importRule, fontFaceRule, keyframesRule, documentRule, hostRule, startingStyleRule;
+	var name, priority="", styleRule, mediaRule, containerRule, supportsRule, importRule, fontFaceRule, keyframesRule, documentRule, hostRule, startingStyleRule;
 
 	var atKeyframesRegExp = /@(-(?:\w+-)+)?keyframes/g;
 
@@ -157,6 +158,13 @@ CSSOM.parse = function parse(token) {
 				i += "media".length;
 				buffer = "";
 				break;
+			} else if (token.indexOf("@container", i) === i) {
+				state = "containerBlock";
+				containerRule = new CSSOM.CSSContainerRule();
+				containerRule.__starts = i;
+				i += "container".length;
+				buffer = "";
+				break;
 			} else if (token.indexOf("@supports", i) === i) {
 				state = "conditionBlock";
 				supportsRule = new CSSOM.CSSSupportsRule();
@@ -225,6 +233,16 @@ CSSOM.parse = function parse(token) {
 				mediaRule.parentStyleSheet = styleSheet;
 				buffer = "";
 				state = "before-selector";
+			} else if (state === "containerBlock") {
+				containerRule.containerText = buffer.trim();
+
+				if (parentRule) {
+					ancestorRules.push(parentRule);
+				}
+				currentScope = parentRule = containerRule;
+				containerRule.parentStyleSheet = styleSheet;
+				buffer = "";
+				state = "before-selector";
 			} else if (state === "conditionBlock") {
 				supportsRule.conditionText = buffer.trim();
 
@@ -411,6 +429,7 @@ CSSOM.parse = function parse(token) {
 						if (
 							parentRule.constructor.name === "CSSMediaRule"
 							|| parentRule.constructor.name === "CSSSupportsRule"
+							|| parentRule.constructor.name === "CSSContainerRule"
 						) {
 							prevScope = currentScope;
 							currentScope = parentRule;
@@ -470,6 +489,7 @@ CSSOM.CSSStyleRule = require("./CSSStyleRule").CSSStyleRule;
 CSSOM.CSSImportRule = require("./CSSImportRule").CSSImportRule;
 CSSOM.CSSGroupingRule = require("./CSSGroupingRule").CSSGroupingRule;
 CSSOM.CSSMediaRule = require("./CSSMediaRule").CSSMediaRule;
+CSSOM.CSSContainerRule = require("./CSSContainerRule").CSSContainerRule;
 CSSOM.CSSConditionRule = require("./CSSConditionRule").CSSConditionRule;
 CSSOM.CSSSupportsRule = require("./CSSSupportsRule").CSSSupportsRule;
 CSSOM.CSSFontFaceRule = require("./CSSFontFaceRule").CSSFontFaceRule;

spec/parse.spec.js

@@ -1246,6 +1246,39 @@ var TESTS = [
 			return result;
 		})()
 	},
+	{
+		input: "@container sidebar (min-width: 400px) { body{max-width:480px} }",
+		result: (function() {
+			var result = {
+				cssRules: [
+					{
+						containerText: "sidebar (min-width: 400px)",
+						cssRules: [
+							{
+								selectorText: "body",
+								style: {
+									0: "max-width",
+									"max-width": "480px",
+									__starts: 64,
+									length: 1
+								},
+								__starts: 60,
+								__ends: 81
+							}
+						],
+						parentRule: null,
+						__starts: 0,
+						__ends: 82
+					}
+				],
+				parentStyleSheet: null
+			};
+			result.cssRules[0].parentStyleSheet = result.cssRules[0].cssRules[0].parentStyleSheet = result;
+			result.cssRules[0].cssRules[0].style.parentRule = result.cssRules[0].cssRules[0];
+			result.cssRules[0].cssRules[0].parentRule = result.cssRules[0];
+			return result;
+		})()
+	},
 	{
 		input: "a{}@-moz-document/**/url-prefix(http://www.w3.org/Style/){body { color: purple; background: yellow; }}",
 		result: (function(){

src/files.js

@@ -6,6 +6,7 @@ exports.files = [
 	"CSSConditionRule",
 	"MediaList",
 	"CSSMediaRule",
+	"CSSContainerRule",
 	"CSSSupportsRule",
 	"CSSImportRule",
 	"CSSFontFaceRule",