# cascade_engine URL: /api/core/cascade_engine/ Section: core -------------------------------------------------------------------------------- cascade_engine - Bengal window.BENGAL_THEME_DEFAULTS = { appearance: 'dark', palette: 'snow-lynx' }; // Progressive Enhancement System Configuration window.Bengal = window.Bengal || {}; window.Bengal.enhanceBaseUrl = '/bengal/assets/js/enhancements'; window.Bengal.watchDom = true; window.Bengal.debug = false; (function () { try { var defaults = window.BENGAL_THEME_DEFAULTS || { appearance: 'system', palette: '' }; var defaultAppearance = defaults.appearance; if (defaultAppearance === 'system') { defaultAppearance = (window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches) ? 'dark' : 'light'; } var storedTheme = localStorage.getItem('bengal-theme'); var storedPalette = localStorage.getItem('bengal-palette'); var theme = storedTheme ? 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Documentation Info About Arrow Clockwise Get Started Note Tutorials File Text Content Palette Theming Settings Building Starburst Extending Bookmark Reference Learning Tracks Releases Dev GitHub API Reference bengal CLI Palette Appearance Chevron Down Mode Monitor System Sun Light Moon Dark Palette Snow Lynx Brown Bengal Silver Bengal Charcoal Bengal Blue Bengal API Reference __main__ bengal Caret Right Folder Analysis community_detection graph_analysis graph_reporting graph_visualizer knowledge_graph link_suggestions link_types page_rank path_analysis performance_advisor results Caret Right Folder Assets manifest pipeline Caret Right Folder Autodoc base config docstring_parser utils virtual_orchestrator Caret Right Folder Extractors cli openapi python Caret Right Folder Models cli common openapi python Caret Right Folder Cache asset_dependency_map cache_store cacheable compression dependency_tracker page_discovery_cache query_index query_index_registry taxonomy_index utils Caret Right 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This module provides the CascadeEngine class which handles all cascade application logic independently from Site and ContentOrchestrator. The engine pre-computes page-section relationships for O(1) top-level page detection, improving performance from O(n²) to O(n). View source 1 Class Classes CascadeEngine Isolated cascade application logic with pre-computed O(1) lookups. Handles metadata cascading wher… 5 Caret Right Isolated cascade application logic with pre-computed O(1) lookups. Handles metadata cascading where section _index.md files can define cascade metadata that propagates to descendant pages. This allows setting common metadata at the section level rather than repeating it on every page. Pre-computes page-section relationships to avoid O(n²) lookups when determining if a page is top-level (not in any section). Attributes Name Type Description pages — All pages in the site sections — All sections in the site _pages_in_sections — Pre-computed set of pages that belong to sections (O(1) lookup) Methods 2 is_top_level_page Check if a page is top-level (not in any section). O(1) lookup using pre-compu… 1 bool Caret Right def is_top_level_page(self, page: Any) -> bool Check if a page is top-level (not in any section). O(1) lookup using pre-computed set. Parameters 1 page Any Page object to check Returns bool — True if page is not in any section, False otherwise apply Apply cascade metadata from sections to pages. Processes root-level cascades f… 0 dict[str, Any] Caret Right def apply(self) -> dict[str, Any] Apply cascade metadata from sections to pages. Processes root-level cascades first, then recursively applies cascades through the section hierarchy. Returns statistics about what was cascaded. Returns dict[str, Any] — Dictionary with cascade statistics: pages_processed: Total pages in site pages_with_cascade: Pages that received cascade values root_cascade_pages: Pages affected by root cascade cascade_keys_applied: Count of each cascaded key Internal Methods 3 Caret Right __init__ Initialize cascade engine with site pages and sections. 2 None Caret Right def __init__(self, pages: list[Any], sections: list[Any]) -> None Initialize cascade engine with site pages and sections. Parameters 2 pages list[Any] List of all Page objects in the site sections list[Any] List of all Section objects in the site _compute_pages_in_sections Pre-compute set of all pages that belong to any section. This enables O(1) loo… 1 set[Any] Caret Right def _compute_pages_in_sections(self, sections: list[Any]) -> set[Any] Pre-compute set of all pages that belong to any section. This enables O(1) lookup later instead of searching all sections for each page. Called once during initialization. Parameters 1 sections list[Any] List of Section objects Returns set[Any] — Set of Page objects that belong to at least one section _apply_section_cascade Recursively apply cascade metadata to a section and its descendants. Cascade m… 3 None Caret Right def _apply_section_cascade(self, section: Any, parent_cascade: dict[str, Any] | None = None, stats: dict[str, Any] | None = None) -> None Recursively apply cascade metadata to a section and its descendants. Cascade metadata accumulates through the hierarchy - child sections inherit from parent and can override/extend it. Parameters 3 section Any Section to apply cascade to parent_cascade dict[str, Any] | None Cascade metadata inherited from parent sections stats dict[str, Any] | None Statistics dictionary to update (for tracking what was cascaded) ← Previous build_context Next → core List © 2025 Bengal ᓚᘏᗢ window.BENGAL_LAZY_ASSETS = { tabulator: '/bengal/assets/js/tabulator.min.js', dataTable: '/bengal/assets/js/data-table.js', mermaidToolbar: '/bengal/assets/js/mermaid-toolbar.9de5abba.js', mermaidTheme: '/bengal/assets/js/mermaid-theme.344822c5.js', graphMinimap: '/bengal/assets/js/graph-minimap.cc7e42e3.js', graphContextual: '/bengal/assets/js/graph-contextual.440e59c6.js' }; window.BENGAL_ICONS = { close: '/bengal/assets/icons/close.911d4fe1.svg', enlarge: '/bengal/assets/icons/enlarge.652035e5.svg', copy: '/bengal/assets/icons/copy.3d56e945.svg', 'download-svg': '/bengal/assets/icons/download.04f07e1b.svg', 'download-png': '/bengal/assets/icons/image.c34dfd40.svg', 'zoom-in': '/bengal/assets/icons/zoom-in.237b4a83.svg', 'zoom-out': '/bengal/assets/icons/zoom-out.38857c77.svg', reset: '/bengal/assets/icons/reset.d26dba29.svg' }; Arrow Up X -------------------------------------------------------------------------------- Metadata: - Author: lbliii - Word Count: 1437 - Reading Time: 7 minutes