Method enterBlock

lib/css/CssParser.js:1148–1187

* Rule entry: report an impure leaf-ish rule (prelude purity is known, body already parsed), push the inherited-context frame, reset per-rule selector flags. * @param {{ isRulePrelude: boolean, treatAsLeaf: boolean, ownSkip: boolean, declarations: Declaration[] | null, childRules: Rule[] | null,

(opts)

			 * @param {{ isRulePrelude: boolean, treatAsLeaf: boolean, ownSkip: boolean, declarations: Declaration[] | null, childRules: Rule[] | null, preludeStart: number, preludeEnd: number }} opts entry options
			 */
			enterBlock(opts) {
				if (!this.enabled) return;
				const {
					isRulePrelude,
					treatAsLeaf,
					ownSkip,
					declarations,
					childRules,
					preludeStart,
					preludeEnd
				} = opts;
				const top = this.stack[this.stack.length - 1];
				const skipOwn = top ? top.skipChildren : false;
				const reportable =
					!this.noCheck &&
					!this.ignorePending &&
					!skipOwn &&
					isRulePrelude &&
					this.ruleImpure;
				if (reportable) {
					const hasBody = Boolean(declarations || childRules);
					let leaf = treatAsLeaf || !hasBody;
					if (!leaf && hasBody) {
						const { hasDirectDecl, hasNestedBlock } = scanRuleBody(
							declarations,
							childRules
						);
						leaf = hasDirectDecl || !hasNestedBlock;
					}
					if (leaf) this.report(preludeStart, preludeEnd);
				}
				this.stack.push({
					ancestorHadLocal:
						this.ancestorHadLocal() || (isRulePrelude && !this.ruleImpure),
					skipChildren: ownSkip || skipOwn
				});
				this.ignorePending = false;
				this.segmentLocal = false;
				this.ruleImpure = false;
			},
			/**
			 * Drop the inherited-context frame (no-op when pure-mode is off).
			 */