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/**
* CSS Custom Properties generator for Turbo Themes.
*
* Generates framework-agnostic CSS variables from theme tokens.
* This is the primary output format for platform-agnostic theming.
*
* @packageDocumentation
*/
import type { ThemeFlavor, ThemeTokens } from '@lgtm-hq/turbo-themes-core';
import { generateSyntaxVarsFromTokens } from './syntax.js';
// Import centralized mappings from config
import {
CORE_MAPPINGS,
CSS_VAR_PREFIX,
OPTIONAL_GROUPS,
} from '@lgtm-hq/turbo-themes-core/css/mappings';
/**
* Resolves a dot-separated path to a value in the tokens object.
*
* @param tokens - The tokens object to traverse
* @param path - Dot-separated path (e.g., 'background.base')
* @returns The resolved value or undefined if path doesn't exist
*/
function resolveTokenPath(tokens: ThemeTokens, path: string): string | undefined {
const parts = path.split('.');
let current: unknown = tokens;
for (const part of parts) {
if (current === null || current === undefined || typeof current !== 'object') {
return undefined;
}
// Safe: path is from hardcoded TOKEN_MAPPINGS, not user input
// nosemgrep: prototype-pollution-loop
current = (current as Record<string, unknown>)[part];
}
return typeof current === 'string' ? current : undefined;
}
/** Default modal backdrop color used when no component token is defined. */
const DEFAULT_MODAL_BACKDROP = 'rgba(10, 10, 10, 0.86)';
/**
* Trusted font provider domains for web font imports.
* Only HTTPS URLs from these domains are allowed to prevent CSS injection.
*/
const TRUSTED_FONT_DOMAINS = [
'fonts.googleapis.com',
'fonts.gstatic.com',
'use.typekit.net',
'fonts.bunny.net',
'rsms.me', // Inter font
'fonts.cdnfonts.com',
'github.githubassets.com', // GitHub themes
] as const;
/**
* Validates that a web font URL is safe to include in CSS.
* Only allows HTTPS URLs from trusted font provider domains.
*
* @param url - The URL to validate
* @returns true if the URL is from a trusted font provider
*/
function isValidFontUrl(url: string): boolean {
try {
const parsed = new URL(url);
if (parsed.protocol !== 'https:') {
return false;
}
return TRUSTED_FONT_DOMAINS.some(
(domain) => parsed.hostname === domain || parsed.hostname.endsWith(`.${domain}`),
);
} catch {
return false;
}
}
/**
* Component token mappings: [cssVarName, componentPath, fallbackTokenPath].
* Each entry maps a CSS variable to a component token path with a fallback.
*/
const COMPONENT_TOKEN_MAPPINGS: ReadonlyArray<[string, string, string]> = [
['card-bg', 'card.bg', 'background.surface'],
['card-border', 'card.border', 'border.default'],
['card-header-bg', 'card.headerBg', 'background.overlay'],
['card-footer-bg', 'card.footerBg', 'background.surface'],
['message-bg', 'message.bg', 'background.surface'],
['message-header-bg', 'message.headerBg', 'background.overlay'],
['message-border', 'message.border', 'border.default'],
['message-body-fg', 'message.bodyFg', 'text.primary'],
['panel-bg', 'panel.bg', 'background.surface'],
['panel-header-bg', 'panel.headerBg', 'background.overlay'],
['panel-header-fg', 'panel.headerFg', 'text.primary'],
['panel-border', 'panel.border', 'border.default'],
['panel-block-bg', 'panel.blockBg', 'background.surface'],
['panel-block-hover-bg', 'panel.blockHoverBg', 'background.overlay'],
['panel-block-active-bg', 'panel.blockActiveBg', 'background.overlay'],
['box-bg', 'box.bg', 'background.surface'],
['box-border', 'box.border', 'border.default'],
['notification-bg', 'notification.bg', 'background.surface'],
['notification-border', 'notification.border', 'border.default'],
['modal-bg', 'modal.bg', ''],
['modal-card-bg', 'modal.cardBg', 'background.surface'],
['modal-header-bg', 'modal.headerBg', 'background.overlay'],
['modal-footer-bg', 'modal.footerBg', 'background.surface'],
['dropdown-bg', 'dropdown.bg', 'background.surface'],
['dropdown-item-hover', 'dropdown.itemHoverBg', 'background.overlay'],
['dropdown-border', 'dropdown.border', 'border.default'],
['tabs-border', 'tabs.border', 'border.default'],
['tabs-link-bg', 'tabs.linkBg', 'background.surface'],
['tabs-link-active-bg', 'tabs.linkActiveBg', 'background.base'],
['tabs-link-hover-bg', 'tabs.linkHoverBg', 'background.overlay'],
];
/**
* Resolves a component token value with fallback to a base token.
* Uses the components section if available, otherwise falls back to base tokens.
*/
function resolveComponentToken(
tokens: ThemeTokens,
componentPath: string,
fallbackPath: string,
): string {
// Try component-specific value first
const componentValue = resolveTokenPath(tokens, `components.${componentPath}`);
if (componentValue !== undefined) return componentValue;
// Special case: modal.bg has a non-token default
if (componentPath === 'modal.bg') return DEFAULT_MODAL_BACKDROP;
// Fall back to base token
Eif (fallbackPath) return resolveTokenPath(tokens, fallbackPath) ?? '';
return '';
}
/**
* Generates CSS custom property declarations from theme tokens.
* Uses centralized mapping configuration for consistency.
*
* @param tokens - The theme tokens to convert
* @returns Array of CSS variable declaration lines
*
* @example
* ```ts
* const lines = generateCssVarsFromTokens(theme.tokens);
* // [' --turbo-bg-base: #1e1e2e;', ' --turbo-bg-surface: #313244;', ...]
* ```
*/
export function generateCssVarsFromTokens(tokens: ThemeTokens): string[] {
const lines: string[] = [];
const prefix = CSS_VAR_PREFIX;
const add = (name: string, value: string): void => {
lines.push(` --${prefix}-${name}: ${value};`);
};
// Apply core mappings from centralized config
for (const mapping of CORE_MAPPINGS) {
// Extract variable name from cssVar (remove prefix if present)
const varName = mapping.cssVar.startsWith('--')
? mapping.cssVar.slice(2) // Remove leading --
: mapping.cssVar;
let value = resolveTokenPath(tokens, mapping.tokenPath);
// Try fallback if primary path didn't resolve
if (value === undefined && mapping.fallbackPath) {
value = resolveTokenPath(tokens, mapping.fallbackPath);
}
if (value !== undefined) {
add(varName, value);
}
}
// Optional token groups
const optionalGroups = OPTIONAL_GROUPS;
// Spacing tokens (if available)
if (tokens.spacing && optionalGroups.spacing) {
const { properties } = optionalGroups.spacing;
for (const prop of properties) {
const value = (tokens.spacing as Record<string, string>)[prop];
Eif (value) {
add(`${optionalGroups.spacing.prefix}-${prop}`, value);
}
}
}
// Elevation tokens (if available)
if (tokens.elevation && optionalGroups.elevation) {
const { properties } = optionalGroups.elevation;
for (const prop of properties) {
const value = (tokens.elevation as Record<string, string>)[prop];
Eif (value) {
add(`${optionalGroups.elevation.prefix}-${prop}`, value);
}
}
}
// Animation tokens (if available) - uses custom mappings
if (tokens.animation && optionalGroups.animation?.mappings) {
for (const mapping of optionalGroups.animation.mappings) {
const value = resolveTokenPath(tokens, mapping.tokenPath);
Eif (value) {
add(`${optionalGroups.animation.prefix}-${mapping.cssVar}`, value);
}
}
}
// Opacity tokens (if available)
if (tokens.opacity && optionalGroups.opacity) {
const { properties } = optionalGroups.opacity;
for (const prop of properties) {
const value = (tokens.opacity as Record<string, number>)[prop];
Eif (value !== undefined) {
add(`${optionalGroups.opacity.prefix}-${prop}`, String(value));
}
}
}
// Component tokens (always emitted with fallbacks from base tokens)
for (const [cssVar, componentPath, fallbackPath] of COMPONENT_TOKEN_MAPPINGS) {
const value = resolveComponentToken(tokens, componentPath, fallbackPath);
Eif (value) {
add(cssVar, value);
}
}
// Syntax highlighting tokens
const syntaxLines = generateSyntaxVarsFromTokens(tokens);
lines.push(...syntaxLines);
return lines;
}
/**
* Generates a complete CSS file for a single theme flavor.
*
* @param flavor - The theme flavor to generate CSS for
* @returns Complete CSS string with data-theme selector
*
* @example
* ```ts
* const css = generateThemeCss(catppuccinMocha);
* // [data-theme="catppuccin-mocha"] { --turbo-bg-base: #1e1e2e; ... }
* ```
*/
export function generateThemeCss(flavor: ThemeFlavor): string {
const vars = generateCssVarsFromTokens(flavor.tokens);
const webFonts = flavor.tokens.typography?.webFonts ?? [];
const fontImports = webFonts
.filter(isValidFontUrl)
.map((url) => `@import url('${url}');`)
.join('\n');
const colorScheme = flavor.appearance === 'dark' ? 'dark' : 'light';
const cssContent = `[data-theme="${flavor.id}"] {
${vars.join('\n')}
color-scheme: ${colorScheme};
}`;
return fontImports ? `${fontImports}\n\n${cssContent}\n` : `${cssContent}\n`;
}
/**
* Design system tokens that are theme-agnostic.
* These provide spacing, shadows, radius, and transitions for components.
*/
const DESIGN_SYSTEM_TOKENS = `
/* Spacing */
--space-xs: 0.25rem;
--space-sm: 0.5rem;
--space-md: 1rem;
--space-lg: 1.5rem;
--space-xl: 2rem;
--space-2xl: 3rem;
--space-3xl: 4rem;
--space-4xl: 6rem;
/* Border Radius */
--radius-sm: 0.5rem;
--radius-md: 0.75rem;
--radius-lg: 1rem;
--radius-xl: 1.5rem;
--radius-2xl: 2rem;
--radius-full: 9999px;
/* Shadows */
--shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
--shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.05);
--shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
--shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15), 0 10px 10px rgba(0, 0, 0, 0.04);
--shadow-glow: 0 0 30px color-mix(in srgb, var(--turbo-brand-primary) 30%, transparent);
--shadow-glow-sm: 0 0 15px color-mix(in srgb, var(--turbo-brand-primary) 20%, transparent);
/* Transitions */
--transition-fast: 120ms ease-out;
--transition-normal: 200ms ease-out;
--transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
/* Gradients (theme-aware) */
--gradient-primary: linear-gradient(135deg, var(--turbo-brand-primary), var(--turbo-state-info));
--gradient-surface: linear-gradient(180deg, var(--turbo-bg-surface), var(--turbo-bg-base));
`;
/**
* Generates the core CSS file with default variable values.
*
* @param defaultFlavor - The theme flavor to use as defaults
* @returns CSS string with :root selector
*
* @example
* ```ts
* const coreCss = generateCoreCss(catppuccinMocha);
* // :root { --turbo-bg-base: #1e1e2e; ... }
* ```
*/
export function generateCoreCss(defaultFlavor: ThemeFlavor): string {
const vars = generateCssVarsFromTokens(defaultFlavor.tokens);
return `:root {\n${vars.join('\n')}\n${DESIGN_SYSTEM_TOKENS}}\n`;
}
/**
* Generates a combined CSS file with all themes.
*
* @param flavors - Array of all theme flavors
* @param defaultFlavorId - ID of the theme to use as :root defaults
* @returns Complete CSS string with core and all theme selectors
*/
export function generateCombinedCss(
flavors: readonly ThemeFlavor[],
defaultFlavorId: string = 'catppuccin-mocha'
): string {
const defaultFlavor = flavors.find((f) => f.id === defaultFlavorId) || flavors[0];
if (!defaultFlavor) {
throw new Error('No flavors provided');
}
const coreCss = generateCoreCss(defaultFlavor);
const themeCss = flavors.map((flavor) => generateThemeCss(flavor)).join('\n');
return `/* Turbo Themes - Pure CSS Custom Properties */\n/* Generated automatically - do not edit */\n\n${coreCss}\n${themeCss}`;
}
/**
* Generates a CSS file containing only `[data-theme]` selectors for all themes.
*
* Unlike `generateCombinedCss()`, this does NOT include a `:root` block.
* Designed for CSS-only theme switching where a blocking script sets
* `data-theme` on `<html>` — no stylesheet swapping required, eliminating FOUC.
*
* @param flavors - Array of all theme flavors
* @returns CSS string with all `[data-theme]` selectors
*
* @example
* ```ts
* const css = generateThemesOnlyCss(flavors);
* // [data-theme="catppuccin-mocha"] { ... }
* // [data-theme="dracula"] { ... }
* ```
*/
export function generateThemesOnlyCss(flavors: readonly ThemeFlavor[]): string {
if (!flavors || flavors.length === 0) {
throw new Error('No flavors provided');
}
const allImports: string[] = [];
const themeBlocks: string[] = [];
for (const flavor of flavors) {
const css = generateThemeCss(flavor);
const lines = css.split('\n');
const imports: string[] = [];
const rest: string[] = [];
for (const line of lines) {
if (line.startsWith('@import ')) {
imports.push(line);
} else {
rest.push(line);
}
}
for (const imp of imports) {
if (!allImports.includes(imp)) {
allImports.push(imp);
}
}
themeBlocks.push(rest.join('\n'));
}
const header = `/* Turbo Themes - All Theme Selectors (no :root defaults) */\n/* Load alongside turbo-core.css + turbo-base.css for FOUC-free theme switching */\n/* Generated automatically - do not edit */`;
const importBlock = allImports.length > 0 ? `${allImports.join('\n')}\n\n` : '';
return `${importBlock}${header}\n\n${themeBlocks.join('\n')}`;
}
// Re-export the prefix for external use
export { CSS_VAR_PREFIX };
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