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* High-performance HTML renderer with caching, monitoring, and streaming support
* Converts object-based components to HTML strings with advanced optimizations
*/
import { BaseRenderer, RendererUtils } from './base-renderer.js';
import {
hasChildren,
normalizeChildren,
} from '../core/object-utils.js';
import { validateNesting } from '../core/html-nesting-rules.js';
import {
escapeHtml,
isVoidElement,
formatAttributes,
minifyHtml
} from '../core/html-utils.js';
import { performanceMonitor } from '../performance/monitor.js';
import { createCacheManager } from '../performance/cache-manager.js';
import { cssUtils, defaultCSSManager } from './css-manager.js';
import { CoherentError, RenderingError, globalErrorHandler } from '../utils/error-handler.js';
// Create a global cache instance for the renderer
const rendererCache = createCacheManager({
maxSize: 1000,
ttlMs: 300000 // 5 minutes
});
function formatRenderPath(path) {
if (!path || path.length === 0) return 'root';
let rendered = 'root';
for (const segment of path) {
Iif (typeof segment !== 'string' || segment.length === 0) continue;
Iif (segment.startsWith('[')) {
rendered += segment;
} else {
rendered += `.${segment}`;
}
}
return rendered;
}
/**
* HTML Renderer Class extending BaseRenderer
*
* @class HTMLRenderer
* @extends BaseRenderer
* @description High-performance HTML renderer with caching, monitoring, and streaming support.
* Converts object-based components to HTML strings with advanced optimizations.
*
* @param {Object} [options={}] - Renderer configuration options
* @param {boolean} [options.enableCache=true] - Enable component caching
* @param {boolean} [options.enableMonitoring=true] - Enable performance monitoring
* @param {boolean} [options.minify=false] - Enable HTML minification
* @param {boolean} [options.streaming=false] - Enable streaming mode
* @param {number} [options.maxDepth=100] - Maximum rendering depth
* @param {number} [options.cacheSize=1000] - Cache size limit
* @param {number} [options.cacheTTL=300000] - Cache TTL in milliseconds
*
* @example
* const renderer = new HTMLRenderer({
* enableCache: true,
* enableMonitoring: true,
* minify: true
* });
*
* const html = renderer.render({ div: { text: 'Hello World' } });
*/
class HTMLRenderer extends BaseRenderer {
constructor(options = {}) {
super({
enableCache: options.enableCache !== false,
enableMonitoring: options.enableMonitoring !== false,
minify: options.minify || false,
streaming: options.streaming || false,
maxDepth: options.maxDepth || 100,
...options
});
// Initialize cache if enabled
Eif (this.config.enableCache && !this.cache) {
this.cache = rendererCache;
}
}
/**
* Main render method - converts components to HTML string
*
* @param {Object|Array|string|Function} component - Component to render
* @param {Object} [options={}] - Rendering options
* @param {Object} [options.context] - Rendering context
* @param {boolean} [options.enableCache] - Override cache setting
* @param {number} [options.depth=0] - Current rendering depth
* @returns {string} Rendered HTML string
*
* @example
* const html = renderer.render({
* div: {
* className: 'container',
* children: [
* { h1: { text: 'Title' } },
* { p: { text: 'Content' } }
* ]
* }
* });
*/
render(component, options = {}) {
const config = { ...this.config, ...options };
this.startTiming();
try {
// Input validation
if (config.validateInput && !this.isValidComponent(component)) {
throw new Error('Invalid component structure');
}
// Initialize seenObjects for circular reference detection
const renderOptions = {
...config,
seenObjects: new WeakSet()
};
// Main rendering logic
const html = this.renderComponent(component, renderOptions, 0, []);
const finalHtml = config.minify ? minifyHtml(html, config) : html;
// Performance monitoring
this.endTiming();
this.recordPerformance('render', this.metrics.startTime, false, {
cacheEnabled: config.enableCache
});
return finalHtml;
} catch (_error) {
this.recordError('render', _error);
const enhancedError = globalErrorHandler.handle(_error, {
renderContext: { path: 'root', renderer: 'html' }
});
Iif (config.throwOnError === false) {
return config.errorFallback;
}
throw enhancedError;
}
}
/**
* Render a single component with full optimization pipeline
*/
renderComponent(component, options, depth = 0, path = []) {
// Handle nullish and empty inputs immediately
if (component === null || component === undefined) {
return '';
}
if (Array.isArray(component) && component.length === 0) {
return '';
}
// Detect circular references (objects only)
if (typeof component === 'object' && component !== null && !Array.isArray(component)) {
if (options.seenObjects && options.seenObjects.has(component)) {
throw new RenderingError(
'Circular reference detected in component tree',
component,
{ path: formatRenderPath(path) },
['Remove the circular reference', 'Use lazy loading to break the cycle']
);
}
if (options.seenObjects) {
options.seenObjects.add(component);
}
}
// Use base class depth validation
this.validateDepth(depth);
try {
// Use base class component type processing
const { type, value } = this.processComponentType(component);
switch (type) {
case 'empty':
return '';
case 'text':
return escapeHtml(value);
case 'function':
{
const result = this.executeFunctionComponent(value, depth);
return this.renderComponent(result, options, depth + 1, [...path, '()']);
}
case 'array':
// Development mode warning for missing keys
if (typeof process !== 'undefined' &&
process.env &&
process.env.NODE_ENV !== 'production' &&
value.length > 1) {
const missingKeyCount = value.filter((child) => {
if (child && typeof child === 'object' && !Array.isArray(child)) {
const tagName = Object.keys(child)[0];
const props = child[tagName];
return props && typeof props === 'object' && props.key === undefined;
}
return false; // primitives don't need keys
}).length;
if (missingKeyCount > 0) {
console.warn(
`[Coherent.js] Array of ${value.length} elements at ${formatRenderPath(path)} ` +
`has ${missingKeyCount} items missing "key" props. ` +
`Keys help identify which items changed for efficient updates. ` +
`Add unique key props like: { div: { key: 'unique-id', ... } }`
);
}
}
return value.map((child, index) => this.renderComponent(child, options, depth + 1, [...path, `[${index}]`])).join('');
case 'element':
{
// Process object-based component
const tagName = Object.keys(value)[0];
const elementContent = value[tagName];
return this.renderElement(tagName, elementContent, options, depth, [...path, tagName]);
}
default:
this.recordError('renderComponent', new Error(`Unknown component type: ${type}`));
return '';
}
} catch (_error) {
const renderPath = formatRenderPath(path);
Eif (_error instanceof CoherentError) {
Iif (!_error.context || typeof _error.context !== 'object') {
_error.context = { path: renderPath };
} else if (I!_error.context.path) {
_error.context = { ..._error.context, path: renderPath };
}
throw _error;
}
throw new RenderingError(_error.message, undefined, { path: renderPath, renderer: 'html' });
}
}
/**
* Render an HTML element with advanced caching and optimization
*/
renderElement(tagName, element, options, depth = 0, path = []) {
const startTime = performance.now();
// Check for circular references in element props
if (element && typeof element === 'object' && !Array.isArray(element)) {
if (options.seenObjects && options.seenObjects.has(element)) {
throw new RenderingError(
'Circular reference detected in component tree',
element,
{ path: formatRenderPath(path) },
['Remove the circular reference', 'Use lazy loading to break the cycle']
);
}
if (options.seenObjects) {
options.seenObjects.add(element);
}
}
// Track element usage for performance analysis (via stats in the new cache manager)
if (options.enableMonitoring && this.cache) {
// The new cache manager tracks usage automatically via get/set operations
}
// Check cache first for static elements
if (options.enableCache && this.cache && RendererUtils.isStaticElement(element)) {
try {
const cacheKey = `static:${tagName}:${JSON.stringify(element)}`;
const cached = this.cache.get('static', cacheKey);
Iif (cached) {
this.recordPerformance(tagName, startTime, true);
return cached.value; // Return the cached HTML
}
} catch {
// Circular reference in element - skip caching and continue with rendering
// The circular reference will be detected and properly reported during render
}
}
// Handle text-only elements including booleans
if (typeof element === 'string' || typeof element === 'number' || typeof element === 'boolean') {
const html = isVoidElement(tagName)
? `<${tagName}>`
: `<${tagName}>${escapeHtml(String(element))}</${tagName}>`;
this.cacheIfStatic(tagName, element, html, options);
this.recordPerformance(tagName, startTime, false);
return html;
}
// Handle function elements
Iif (typeof element === 'function') {
const result = this.executeFunctionComponent(element, depth);
return this.renderElement(tagName, result, options, depth, [...path, '()']);
}
// Handle object elements (complex elements with props and children)
Eif (element && typeof element === 'object') {
return this.renderObjectElement(tagName, element, options, depth, path);
}
// Handle null and undefined by returning empty tags
if (element === null || element === undefined) {
const html = isVoidElement(tagName)
? `<${tagName}>`
: `<${tagName}></${tagName}>`;
this.recordPerformance(tagName, startTime, false);
return html;
}
// Fallback for any other types
const html = `<${tagName}>${escapeHtml(String(element))}</${tagName}>`;
this.recordPerformance(tagName, startTime, false);
return html;
}
/**
* Cache element if it's static
*/
cacheIfStatic(tagName, element, html) {
if (this.config.enableCache && this.cache && RendererUtils.isStaticElement(element)) {
try {
const cacheKey = `static:${tagName}:${JSON.stringify(element)}`;
this.cache.set('static', cacheKey, html, {
ttlMs: this.config.cacheTTL || 5 * 60 * 1000, // 5 minutes default
size: html.length // Approximate size
});
} catch {
// Circular reference - skip caching
}
}
}
/**
* Render complex object elements with attributes and children
*/
renderObjectElement(tagName, element, options, depth = 0, path = []) {
const startTime = performance.now();
// Check component-level cache
Eif (options.enableCache && this.cache) {
const cacheKey = RendererUtils.generateCacheKey(tagName, element);
if (cacheKey) {
const cached = this.cache.get(cacheKey);
if (cached) {
this.recordPerformance(tagName, startTime, true);
return cached;
}
}
}
// Extract props and children directly from element content
// Note: key is extracted but NOT rendered as an HTML attribute
// It's used for reconciliation identity, not DOM output
// html prop is extracted to prevent it from being rendered as an attribute
const { children, text, key: _key, html: _rawHtml, ...attributes } = element || {};
// Build opening tag with attributes
const attributeString = formatAttributes(attributes);
const openingTag = attributeString
? `<${tagName} ${attributeString}>`
: `<${tagName}>`;
// Handle raw HTML injection (unescaped) — for SSR use cases like syntax highlighting
Iif (_rawHtml !== undefined) {
const rawContent = typeof _rawHtml === 'function' ? String(_rawHtml()) : String(_rawHtml);
const result = `${openingTag}${rawContent}</${tagName}>`;
return result;
}
// Handle text content
let textContent = '';
if (text !== undefined) {
const isScript = tagName === 'script';
const isStyle = tagName === 'style';
const isRawTag = isScript || isStyle;
const raw = typeof text === 'function' ? String(text()) : String(text);
Iif (isRawTag) {
// Prevent </script> or </style> early-terminating the tag
const safe = raw
.replace(/<\/(script)/gi, '<\\/$1')
.replace(/<\/(style)/gi, '<\\/$1')
// Escape problematic Unicode line separators in JS
.replace(/\u2028/g, '\\u2028')
.replace(/\u2029/g, '\\u2029');
textContent = safe;
} else {
textContent = escapeHtml(raw);
}
}
// Handle children
let childrenHtml = '';
if (hasChildren(element)) {
const normalizedChildren = normalizeChildren(children);
childrenHtml = normalizedChildren
.map((child, index) => {
// Validate HTML nesting before rendering child
if (child && typeof child === 'object' && !Array.isArray(child)) {
const childTagName = Object.keys(child)[0];
Eif (childTagName) {
validateNesting(tagName, childTagName, formatRenderPath([...path, `children[${index}]`]));
}
}
return this.renderComponent(child, options, depth + 1, [...path, `children[${index}]`]);
})
.join('');
}
// Build complete HTML
const html = `${openingTag}${textContent}${childrenHtml}</${tagName}>`;
// Cache the result if appropriate
if (options.enableCache && this.cache && RendererUtils.isCacheable(element, options)) {
const cacheKey = RendererUtils.generateCacheKey(tagName, element);
Eif (cacheKey) {
this.cache.set(cacheKey, html);
}
}
this.recordPerformance(tagName, startTime, false);
return html;
}
}
// Note: globalCache is now imported from cache-manager.js
/**
* Main render function - converts object components to HTML
*/
export function render(component, options = {}) {
// Merge default options with provided options
const mergedOptions = {
enableCache: true,
enableMonitoring: false,
...options
};
const renderer = new HTMLRenderer(mergedOptions);
return renderer.render(component, mergedOptions);
}
/**
* Renders component to complete HTML document with DOCTYPE
* Better alternative to manual DOCTYPE concatenation
* Supports CSS file inclusion and inline styles
*/
export async function renderHTML(component, options = {}) {
const htmlContent = render(component, options);
// Process CSS options
const cssOptions = cssUtils.processCSSOptions(options);
// Generate CSS HTML if any CSS is specified
let cssHtml = '';
if (cssOptions.files.length > 0 || cssOptions.links.length > 0 || cssOptions.inline) {
cssHtml = await cssUtils.generateCSSHtml(cssOptions, defaultCSSManager);
}
// If the component includes a head tag, inject CSS into it
if (cssHtml && htmlContent.includes('<head>')) {
const htmlWithCSS = htmlContent.replace(
'</head>',
`${cssHtml}\n</head>`
);
return `<!DOCTYPE html>\n${htmlWithCSS}`;
}
// If there's CSS but no head tag, wrap the component with a basic HTML structure
if (cssHtml) {
return `<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
${cssHtml}
</head>
<body>
${htmlContent}
</body>
</html>`;
}
return `<!DOCTYPE html>\n${htmlContent}`;
}
/**
* Synchronous version of render for cases without CSS files
* Falls back to async if CSS files are detected
*/
export function renderHTMLSync(component, options = {}) {
const cssOptions = cssUtils.processCSSOptions(options);
// If CSS files are specified, return a promise
if (cssOptions.files.length > 0) {
console.warn('CSS files detected, use render() (async) instead of renderSync()');
return render(component, options);
}
const htmlContent = render(component, options);
// Handle inline CSS and external links only
let cssHtml = '';
if (cssOptions.links.length > 0) {
cssHtml += defaultCSSManager.generateCSSLinks(cssOptions.links);
}
if (cssOptions.inline) {
cssHtml += `\n${ defaultCSSManager.generateInlineStyles(cssOptions.inline)}`;
}
if (cssHtml && htmlContent.includes('<head>')) {
const htmlWithCSS = htmlContent.replace(
'</head>',
`${cssHtml}\n</head>`
);
return `<!DOCTYPE html>\n${htmlWithCSS}`;
}
if (cssHtml) {
return `<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
${cssHtml}
</head>
<body>
${htmlContent}
</body>
</html>`;
}
return `<!DOCTYPE html>\n${htmlContent}`;
}
// Old functions removed - now part of HTMLRenderer class
// Old helper functions removed - now available in RendererUtils from BaseRenderer
/**
* Batch rendering for multiple components
*/
export function renderBatch(components, options = {}) {
if (!Array.isArray(components)) {
throw new Error('renderBatch expects an array of components');
}
// Merge default options with provided options
const mergedOptions = {
enableCache: true,
enableMonitoring: false,
...options
};
const renderer = new HTMLRenderer(mergedOptions);
return components.map(component => renderer.render(component, mergedOptions));
}
/**
* Real streaming render - yields chunks progressively as HTML is generated
* Ideal for large component trees or memory-constrained environments
*/
export async function* renderToStream(component, options = {}) {
const config = {
chunkSize: 8192, // 8KB default chunk size
maxDepth: 1000,
yieldThreshold: 100, // Yield control every 100 elements
encoding: 'utf8',
...options
};
let buffer = '';
let elementCount = 0;
// Helper to flush buffer when it reaches chunk size
async function* flushBuffer(force = false) {
if (force || buffer.length >= config.chunkSize) {
if (buffer.length > 0) {
yield buffer;
buffer = '';
}
}
}
// Helper to add to buffer
async function* write(text) {
buffer += text;
yield* flushBuffer();
}
// Recursive streaming component renderer
async function* streamComponent(comp, depth = 0) {
Iif (depth > config.maxDepth) {
throw new Error(`Maximum nesting depth exceeded: ${config.maxDepth}`);
}
// Handle null/undefined
Iif (comp === null || comp === undefined) return;
// Handle primitives
Iif (typeof comp === 'string' || typeof comp === 'number') {
yield* write(escapeHtml(String(comp)));
return;
}
// Handle arrays
if (Array.isArray(comp)) {
for (const child of comp) {
yield* streamComponent(child, depth);
// Yield control periodically
Iif (elementCount++ % config.yieldThreshold === 0) {
await new Promise(resolve => setImmediate(resolve));
}
}
return;
}
// Handle functions
if (typeof comp === 'function') {
const result = comp();
yield* streamComponent(result, depth);
return;
}
// Handle objects (HTML elements)
Eif (typeof comp === 'object') {
for (const [tagName, props] of Object.entries(comp)) {
if (typeof props === 'object' && props !== null) {
const { children, text, ...attributes } = props;
const attrsStr = formatAttributes(attributes);
const openTag = attrsStr ? `<${tagName} ${attrsStr}>` : `<${tagName}>`;
Iif (isVoidElement(tagName)) {
yield* write(openTag.replace('>', ' />'));
elementCount++;
return;
}
yield* write(openTag);
if (text !== undefined) {
yield* write(escapeHtml(String(text)));
} else if (Echildren) {
yield* streamComponent(children, depth + 1);
}
yield* write(`</${tagName}>`);
elementCount++;
} else if (props === null || props === undefined) {
// Handle null/undefined props - render empty element
Iif (isVoidElement(tagName)) {
yield* write(`<${tagName} />`);
} else {
yield* write(`<${tagName}></${tagName}>`);
}
elementCount++;
} else if (Etypeof props === 'string') {
const content = escapeHtml(props);
if (isVoidElement(tagName)) {
yield* write(`<${tagName} />`);
} else {
yield* write(`<${tagName}>${content}</${tagName}>`);
}
elementCount++;
}
}
}
}
// Start streaming
try {
yield* streamComponent(component);
yield* flushBuffer(true); // Force flush remaining buffer
} catch (error) {
// Stream error as HTML comment
yield `<!-- Streaming Error: ${error.message} -->`;
}
}
/**
* Streaming utilities for common use cases
*/
export const streamingUtils = {
/**
* Collect all chunks into a single string
*/
async collectChunks(chunkGenerator) {
let html = '';
for await (const chunk of chunkGenerator) {
html += chunk;
}
return html;
},
/**
* Stream directly to a Node.js response
*/
async streamToResponse(chunkGenerator, response) {
let totalBytes = 0;
response.setHeader('Content-Type', 'text/html; charset=utf-8');
response.setHeader('Transfer-Encoding', 'chunked');
for await (const chunk of chunkGenerator) {
response.write(chunk);
totalBytes += Buffer.byteLength(chunk);
}
response.end();
return totalBytes;
},
/**
* Stream with progress callback
*/
async* streamWithProgress(chunkGenerator, onProgress) {
let totalBytes = 0;
let chunkCount = 0;
for await (const chunk of chunkGenerator) {
totalBytes += Buffer.byteLength(chunk);
chunkCount++;
if (onProgress) {
onProgress({ chunkCount, totalBytes, chunk });
}
yield chunk;
}
}
};
/**
* Render to chunks (legacy - kept for backward compatibility)
* For true streaming, use renderToStream() instead
*/
export function* renderToChunks(component, options = {}) {
const mergedOptions = {
enableCache: true,
enableMonitoring: false,
...options,
chunkSize: options.chunkSize || 1024 // Default 1KB chunks
};
const html = render(component, mergedOptions);
for (let i = 0; i < html.length; i += mergedOptions.chunkSize) {
yield html.slice(i, i + mergedOptions.chunkSize);
}
}
/**
* Get global cache instance for external access
*/
export function getCache() {
return rendererCache;
}
/**
* Reset cache (useful for testing)
*/
export function resetCache() {
Eif (rendererCache) {
rendererCache.clear();
}
}
/**
* Get rendering statistics
*/
export function getRenderingStats() {
return {
cache: rendererCache ? rendererCache.getStats() : null,
performance: performanceMonitor.getStats()
};
}
/**
* Precompile static components for maximum performance
*/
export function precompileComponent(component, options = {}) {
if (!isStaticElement(component)) {
throw new Error('Can only precompile static components');
}
const html = render(component, { ...options, enableCache: false });
return {
html,
isPrecompiled: true,
render: () => html
};
}
/**
* Development helper - render with detailed timing
*/
export function renderWithTiming(component, options = {}) {
const start = performance.now();
const html = render(component, { ...options, enableMonitoring: true });
const end = performance.now();
return {
html,
timing: {
total: end - start,
breakdown: performanceMonitor.getStats()
}
};
}
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