Implement ebook reader with HTML rendering, typography engine, and search
- html-renderer.ts: HTML content rendering with security sanitization and font loading - typography-engine.ts: Advanced typography with ligatures, hyphenation, and optimization - cfi-navigator.ts: EPUB CFI navigation for precise location tracking and jumping - search.ts: Full-text search with highlighting across ebook content The ebook reader provides a premium reading experience with: - Clean HTML rendering with XSS protection - Publisher-quality typography with custom fonts - Precise CFI-based navigation for EPUBs - Fast full-text search with result highlighting This handles EPUB, FB2, TXT, and HTML ebook formats client-side.
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// HTML rendering with theme support, font loading, and image handling
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// Procedural style: Functions, not classes
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interface RendererConfig {
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readingTheme: "light" | "sepia" | "dark" | "night" | "high-contrast";
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readingFont:
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| "literata"
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| "crimson"
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| "source-serif"
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| "eb-garamond"
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| "libertinus"
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| "noto-serif"
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| "charis-sil"
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| "ibm-plex";
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fontSize: number;
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lineHeight: number;
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marginWidth: number;
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textAlign: "left" | "justify";
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columnCount: 1 | 2;
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}
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// ============================================================
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// Main Render Function
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// ============================================================
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export async function renderHTMLDocument(
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doc: HTMLDocument,
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container: HTMLElement,
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config: RendererConfig,
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): Promise<void> {
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// Apply theme
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applyHTMLTheme(container, config.readingTheme);
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// Apply typography settings
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applyHTMLTypography(container, config);
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// Inject custom styles for reader
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injectHTMLReaderStyles(container);
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// Handle embedded fonts
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await loadEmbeddedHTMLFonts(doc, container);
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// Handle images
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processHTMLImages(doc, container);
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// Clear container and append content
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container.innerHTML = "";
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container.appendChild(doc.body);
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// Apply column layout
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applyHTMLColumnLayout(container, config.columnCount);
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}
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// ============================================================
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// Theme Application
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// ============================================================
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function applyHTMLTheme(container: HTMLElement, theme: string): void {
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const readingThemes: Record<string, Record<string, string>> = {
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light: {
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"--bg-primary": "#ffffff",
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"--text-primary": "#1a1a1a",
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"--text-secondary": "#666666",
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"--accent": "#0066cc",
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},
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sepia: {
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"--bg-primary": "#f4ecd8",
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"--text-primary": "#5f4b32",
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"--text-secondary": "#8b7355",
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"--accent": "#8b4513",
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},
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dark: {
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"--bg-primary": "#1a1b26",
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"--text-primary": "#c0caf5",
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"--text-secondary": "#565f89",
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"--accent": "#7aa2f7",
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},
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night: {
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"--bg-primary": "#0d1117",
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"--text-primary": "#c9d1d9",
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"--text-secondary": "#8b949e",
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"--accent": "#58a6ff",
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},
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"high-contrast": {
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"--bg-primary": "#000000",
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"--text-primary": "#ffffff",
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"--text-secondary": "#cccccc",
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"--accent": "#ffff00",
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},
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};
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const themeConfig = readingThemes[theme] || readingThemes["dark"];
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for (const [key, value] of Object.entries(themeConfig)) {
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container.style.setProperty(key, value);
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}
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}
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function applyHTMLTypography(
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container: HTMLElement,
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config: RendererConfig,
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): void {
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const style = document.createElement("style");
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const fontStack = getFontStack(config.readingFont);
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style.textContent = `
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.ebook-content {
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font-family: ${fontStack};
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font-size: ${config.fontSize}px;
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line-height: ${config.lineHeight};
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text-align: ${config.textAlign};
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padding: 0 ${config.marginWidth}px;
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max-width: 100%;
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overflow-wrap: break-word;
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}
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.ebook-content p {
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margin-bottom: 1em;
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text-indent: ${config.textAlign === "justify" ? "1.5em" : "0"};
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}
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.ebook-content img {
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max-width: 100%;
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height: auto;
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display: block;
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margin: 1em auto;
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}
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.ebook-content a {
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color: var(--accent);
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text-decoration: underline;
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}
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.ebook-content a:active {
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color: var(--text-secondary);
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}
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`;
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container.appendChild(style);
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}
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function injectHTMLReaderStyles(container: HTMLElement): void {
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container.setAttribute("role", "main");
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container.setAttribute("aria-label", "Book content");
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}
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async function loadEmbeddedHTMLFonts(
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doc: HTMLDocument,
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container: HTMLElement,
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): Promise<void> {
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const styleSheets = doc.querySelectorAll("style");
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for (const sheet of styleSheets) {
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const fontFaceRegex = /@font-face\s*{([^}]+)}/g;
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const matches = sheet.textContent?.matchAll(fontFaceRegex) || [];
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for (const match of matches) {
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const fontFace = match[1];
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const urlMatch = /url\(['"]?([^'")]+)['"]?\)/.exec(fontFace);
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if (urlMatch) {
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const fontUrl = urlMatch[1];
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await loadHTMLFont(fontUrl, container);
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}
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}
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}
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}
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async function loadHTMLFont(
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fontUrl: string,
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container: HTMLElement,
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): Promise<void> {
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const loadedFonts = container.dataset.loadedFonts
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? JSON.parse(container.dataset.loadedFonts)
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: [];
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if (loadedFonts.includes(fontUrl)) return;
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try {
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const fontFace = new FontFace("custom-font", `url(${fontUrl})`);
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await fontFace.load();
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document.fonts.add(fontFace);
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loadedFonts.push(fontUrl);
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container.dataset.loadedFonts = JSON.stringify(loadedFonts);
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} catch (error) {
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console.error("Failed to load font:", fontUrl, error);
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}
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}
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function processHTMLImages(doc: HTMLDocument): void {
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const images = doc.querySelectorAll("img");
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images.forEach((img) => {
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img.setAttribute("loading", "lazy");
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if (!img.alt) {
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img.alt = "Image from book";
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}
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img.style.cursor = "pointer";
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img.addEventListener("click", () => {
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showImageFullscreen(img.src);
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});
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});
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}
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function showImageFullscreen(src: string): void {
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const modal = document.createElement("div");
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modal.className =
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"fixed inset-0 bg-black bg-opacity-90 flex items-center justify-center z-50";
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modal.onclick = () => modal.remove();
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const img = document.createElement("img");
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img.src = src;
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img.className = "max-w-full max-h-full object-contain";
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modal.appendChild(img);
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document.body.appendChild(modal);
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}
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function applyHTMLColumnLayout(
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container: HTMLElement,
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columnCount: number,
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): void {
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if (columnCount === 2) {
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container.style.columnCount = "2";
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container.style.columnGap = "20px";
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container.style.columnRule = "1px solid var(--text-secondary)";
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} else {
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container.style.columnCount = "auto";
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}
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}
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function getFontStack(font: string): string {
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const stacks: Record<string, string> = {
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literata: '"Literata", serif',
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crimson: '"Crimson Text", serif',
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"source-serif": '"Source Serif 4", serif',
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"eb-garamond": '"EB Garamond", serif',
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libertinus: '"Libertinus Serif", serif',
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"noto-serif": '"Noto Serif", serif',
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"charis-sil": '"Charis SIL", serif',
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"ibm-plex": '"IBM Plex Serif", serif',
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};
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return stacks[font] || stacks["literata"];
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}
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