# themes URL: /api/themes/ Section: themes -------------------------------------------------------------------------------- themes - Rosettes window.BENGAL_THEME_DEFAULTS = { appearance: 'light', palette: 'brown-bengal' }; window.Bengal = window.Bengal || {}; window.Bengal.enhanceBaseUrl = '/rosettes/assets/js/enhancements'; window.Bengal.watchDom = true; window.Bengal.debug = false; window.Bengal.enhanceUrls = { 'toc': '/rosettes/assets/js/enhancements/toc.632a9783.js', 'docs-nav': '/rosettes/assets/js/enhancements/docs-nav.57e4b129.js', 'tabs': '/rosettes/assets/js/enhancements/tabs.aac9e817.js', 'lightbox': '/rosettes/assets/js/enhancements/lightbox.1ca22aa1.js', 'interactive': '/rosettes/assets/js/enhancements/interactive.fc077855.js', 'mobile-nav': '/rosettes/assets/js/enhancements/mobile-nav.d991657f.js', 'action-bar': '/rosettes/assets/js/enhancements/action-bar.d62417f4.js', 'copy-link': '/rosettes/assets/js/enhancements/copy-link.7d9a5c29.js', 'data-table': '/rosettes/assets/js/enhancements/data-table.1f5bc1eb.js', 'lazy-loaders': '/rosettes/assets/js/enhancements/lazy-loaders.a5c38245.js', 'holo': '/rosettes/assets/js/enhancements/holo.ee13c841.js', 'link-previews': '/rosettes/assets/js/enhancements/link-previews.8d906535.js' }; (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 ? (storedTheme === 'system' ? defaultAppearance : storedTheme) : defaultAppearance; var palette = storedPalette ?? defaults.palette; document.documentElement.setAttribute('data-theme', theme); if (palette) { document.documentElement.setAttribute('data-palette', palette); } } catch (e) { document.documentElement.setAttribute('data-theme', 'light'); } })(); { "prerender": [ { "where": { "and": [ { "href_matches": "/docs/*" }, { "not": { "selector_matches": "[data-external], [target=_blank], .external" } } ] }, "eagerness": "conservative" } ], "prefetch": [ { "where": { "and": [ { "href_matches": "/*" }, { "not": { "selector_matches": "[data-external], [target=_blank], .external" } } ] }, "eagerness": "conservative" } ] } Skip to main content Magnifying Glass ESC Recent Clear Magnifying Glass No results for "" Start typing to search... ↑↓ Navigate ↵ Open ESC Close Powered by Lunr ⌾⌾⌾ DocumentationInfoAboutArrow ClockwiseGet StartedCodeHighlightingPaletteStylingStarburstExtendingFormattersNoteTutorialsBookmarkReferenceReleasesDevGitHubAPI Reference Magnifying Glass Search ⌘K Palette Appearance Chevron Down Mode Monitor System Sun Light Moon Dark Palette Snow Lynx Brown Bengal Silver Bengal Charcoal Bengal Blue Bengal List ⌾⌾⌾ Magnifying Glass Search X Close Documentation Caret Down Info About Arrow Clockwise Get Started Code Highlighting Palette Styling Starburst Extending Formatters Note Tutorials Bookmark Reference Releases Dev Caret Down GitHub API Reference Palette Appearance Chevron Down Mode Monitor System Sun Light Moon Dark Palette Snow Lynx Brown Bengal Silver Bengal Charcoal Bengal Blue Bengal Rosettes API Reference Caret Right Formatters html null terminal Caret Right Lexers _scanners _state_machine bash_sm c_sm clojure_sm cpp_sm css_sm csv_sm cuda_sm cue_sm dart_sm diff_sm dockerfile_sm elixir_sm gleam_sm go_sm graphql_sm groovy_sm haskell_sm hcl_sm html_sm ini_sm java_sm javascript_sm jinja_sm json_sm julia_sm kida_sm kotlin_sm lua_sm makefile_sm markdown_sm mojo_sm nginx_sm nim_sm perl_sm php_sm pkl_sm plaintext_sm powershell_sm protobuf_sm python_sm r_sm ruby_sm rust_sm scala_sm sql_sm stan_sm swift_sm toml_sm tree_sm triton_sm typescript_sm v_sm xml_sm yaml_sm zig_sm Caret Right Themes _mapping _palette _roles palettes _config _escape _formatter_registry _parallel _protocol _registry _types delegate rosettes Rosettes API Reference ᗢ Caret Down Link Copy URL External Open LLM text Copy Copy LLM text Share with AI Ask Claude Ask ChatGPT Ask Gemini Ask Copilot Module themes Rosettes themes package. Semantic token system for syntax highlighting with modern CSS support. Provides palettes, CSS generation, and accessibility validation. Design Philosophy: Rosettes uses a semantic role system instead of individual token colors: Roles over Tokens: ~20 semantic roles (FUNCTION, STRING, COMMENT) instead of 100+ token types. Themes define colors for roles. Separation of Concerns: Token → Role mapping is language-agnostic. Palettes define colors for roles, not specific syntax. CSS Custom Properties: Palettes generate CSS variables for runtime theming without regenerating HTML. Quick Start: >>> from rosettes.themes import MONOKAI, get_palette >>> palette = get_palette("monokai") >>> css_vars = palette.to_css_vars() Architecture: SyntaxRole: Semantic meaning of code elements (FUNCTION, STRING, etc.) TokenType → Role: Mapping from fine-grained tokens to semantic roles SyntaxPalette: Immutable color definitions for each role AdaptivePalette: Light/dark mode support with CSS media queries Types: SyntaxRole: Enum of semantic roles SyntaxPalette: Immutable theme definition (~20 color slots) AdaptivePalette: Light/dark adaptive theme Built-in Palettes: Bengal Themes: BENGAL_TIGER: Warm orange tones (default) BENGAL_SNOW_LYNX: Cool light theme BENGAL_CHARCOAL: Dark gray theme BENGAL_BLUE: Cool blue tones Third-Party Compatible: MONOKAI: Classic dark theme DRACULA: Purple-accented dark theme GITHUB: Light/dark GitHub-style themes Custom Palettes: >>> from rosettes.themes import SyntaxPalette, register_palette >>> my_theme = SyntaxPalette( ... name="my-theme", ... background="#1a1a1a", ... text="#f0f0f0", ... string="#98c379", ... function="#61afef", ... ) >>> register_palette(my_theme) See Also: rosettes.themes._roles: SyntaxRole enum definition rosettes.themes._mapping: TokenType → SyntaxRole mapping rosettes.themes._palette: SyntaxPalette and AdaptivePalette classes 4Functions Functions _init_registry 0 None ▼ Initialize the palette registry with built-in palettes. def _init_registry() -> None register_palette 1 None ▼ Register a custom palette. def register_palette(palette: Palette) -> None Parameters Name Type Description palette Palette The palette to register. get_palette 1 Palette ▼ Get a registered palette by name. def get_palette(name: str) -> Palette Parameters Name Type Description name str The palette name. Returns Palette list_palettes 0 list[str] ▼ List all registered palette names. def list_palettes() -> list[str] Returns list[str] ← Previous palettes List © 2026 Rosettes built in ᓚᘏᗢ { "linkPreviews": { "enabled": true, "hoverDelay": 200, "hideDelay": 150, "showSection": true, "showReadingTime": true, "showWordCount": true, "showDate": true, "showTags": true, "maxTags": 3, "includeSelectors": [".prose"], "excludeSelectors": ["nav", ".toc", ".breadcrumb", ".pagination", ".card", "[class*='-card']", ".tab-nav", "[class*='-widget']", ".child-items", ".content-tiles"], "allowedHosts": [], "allowedSchemes": ["https"], "hostFailureThreshold": 3 } } window.BENGAL_LAZY_ASSETS = { tabulator: '/rosettes/assets/js/tabulator.min.js', dataTable: '/rosettes/assets/js/data-table.js', mermaidToolbar: '/rosettes/assets/js/mermaid-toolbar.9de5abba.js', mermaidTheme: '/rosettes/assets/js/mermaid-theme.344822c5.js', graphMinimap: '/rosettes/assets/js/graph-minimap.ff04e939.js', graphContextual: '/rosettes/assets/js/graph-contextual.355458ba.js' }; window.BENGAL_ICONS = { close: '/rosettes/assets/icons/close.911d4fe1.svg', enlarge: '/rosettes/assets/icons/enlarge.652035e5.svg', copy: '/rosettes/assets/icons/copy.3d56e945.svg', 'download-svg': '/rosettes/assets/icons/download.04f07e1b.svg', 'download-png': '/rosettes/assets/icons/image.c34dfd40.svg', 'zoom-in': '/rosettes/assets/icons/zoom-in.237b4a83.svg', 'zoom-out': '/rosettes/assets/icons/zoom-out.38857c77.svg', reset: '/rosettes/assets/icons/reset.d26dba29.svg' }; Arrow Up -------------------------------------------------------------------------------- Metadata: - Word Count: 815 - Reading Time: 4 minutes