Add @layer cascade layers (block and statement forms)#219
Open
jhaygood86 wants to merge 1 commit into
Open
Conversation
Parse the @layer at-rule (CSS Cascade 5): the block form `@layer name { rules }` (incl. anonymous `@layer { rules }`) as a grouping rule (LayerRule/ILayerRule), and the order-declaring statement form `@layer a, b, c;` (LayerStatementRule). Adds the Layer/LayerStatement rule types and a StylesheetComposer.CreateLayer dispatch with a comma- separated, dotted-ident name reader. Cascade precedence between layers is left to the consumer; this adds the object-model representation only. Ported from PeachPDF, which vendors ExCSS.
jhaygood86
marked this pull request as ready for review
July 24, 2026 20:00
jhaygood86
marked this pull request as draft
July 24, 2026 20:35
jhaygood86
marked this pull request as ready for review
July 24, 2026 20:35
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Summary
Adds parsing for the
@layercascade-layer at-rule (CSS Cascade 5):@layer name { rules }, including anonymous@layer { rules }— modeled as a grouping rule (LayerRule/ publicILayerRulewith aName).@layer a, b, c;— declaring layer order with no rules (LayerStatementRule, exposing the orderedNames).Adds the
Layer/LayerStatementRuleTypes and aStylesheetComposer.CreateLayerdispatch with a comma-separated, dotted-ident (framework.utilities) name reader.This adds the object-model representation only — cascade precedence between layers is left to the consumer (ExCSS does no cascade resolution).
Tests
CascadeLayerTests— named/anonymous block layers, dotted names, statement-form ordered names, round-trips, and@layeramong other rules. Full suite green across all target frameworks.Ported from PeachPDF, which vendors ExCSS.