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* Base Renderer Class
* Provides common functionality shared across all Coherent.js renderers
* Reduces code duplication and ensures consistent behavior
*/
import {
validateComponent,
isCoherentObject,
extractProps,
hasChildren,
normalizeChildren,
} from '../core/object-utils.js';
import { performanceMonitor } from '../performance/monitor.js';
/**
* Unified configuration for all Coherent.js renderers
* Includes options for HTML, Streaming, and DOM renderers
*/
export const DEFAULT_RENDERER_CONFIG = {
// Core rendering options
maxDepth: 100,
enableValidation: true,
enableMonitoring: false,
validateInput: true,
// HTML Renderer specific options
enableCache: true,
minify: false,
cacheSize: 1000,
cacheTTL: 300000, // 5 minutes
// Streaming Renderer specific options
chunkSize: 1024, // Size of each chunk in bytes
bufferSize: 4096, // Internal buffer size
enableMetrics: false, // Track streaming metrics
yieldThreshold: 100, // Yield control after N elements
encoding: 'utf8', // Output encoding
// DOM Renderer specific options
enableHydration: true, // Enable hydration support
namespace: null, // SVG namespace support
// Performance options
enablePerformanceTracking: false,
performanceThreshold: 10, // ms threshold for slow renders
// Development options
enableDevWarnings: typeof process !== 'undefined' && process.env && process.env.NODE_ENV === 'development',
enableDebugLogging: false,
// Error handling options
errorFallback: '', // Fallback content on errors
throwOnError: true, // Whether to throw or return fallback
};
/**
* Base renderer class with common functionality
*/
export class BaseRenderer {
constructor(options = {}) {
this.config = this.validateAndMergeConfig(options);
this.metrics = {
startTime: null,
endTime: null,
elementsProcessed: 0
};
}
/**
* Validate and merge configuration options
*/
validateAndMergeConfig(options) {
const config = { ...DEFAULT_RENDERER_CONFIG, ...options };
// Validate critical options
if (typeof config.maxDepth !== 'number') {
throw new Error('maxDepth must be a number');
}
if (config.maxDepth <= 0) {
throw new Error('maxDepth must be a positive number');
}
if (typeof config.chunkSize !== 'number') {
throw new Error('chunkSize must be a number');
}
if (config.chunkSize <= 0) {
throw new Error('chunkSize must be a positive number');
}
if (typeof config.yieldThreshold !== 'number') {
throw new Error('yieldThreshold must be a number');
}
if (config.yieldThreshold <= 0) {
throw new Error('yieldThreshold must be a positive number');
}
// Warn about potentially problematic configurations
if (config.enableDevWarnings) {
if (config.maxDepth > 1000) {
console.warn('Coherent.js: maxDepth > 1000 may cause performance issues');
}
if (config.chunkSize > 16384) {
console.warn('Coherent.js: Large chunkSize may increase memory usage');
}
}
return config;
}
/**
* Get configuration for specific renderer type
*/
getRendererConfig(rendererType) {
const baseConfig = { ...this.config };
switch (rendererType) {
case 'html':
return {
...baseConfig,
// HTML-specific defaults
enableCache: baseConfig.enableCache !== false,
enableMonitoring: baseConfig.enableMonitoring !== false
};
case 'streaming':
return {
...baseConfig,
// Streaming-specific defaults
enableMetrics: baseConfig.enableMetrics ?? false,
maxDepth: baseConfig.maxDepth ?? 1000 // Higher default for streaming
};
case 'dom':
return {
...baseConfig,
// DOM-specific defaults
enableHydration: baseConfig.enableHydration !== false
};
default:
return baseConfig;
}
}
/**
* Validate component structure
*/
validateComponent(component) {
if (this.config.validateInput !== false) {
return validateComponent(component);
}
return true;
}
/**
* Check if component is valid for rendering
*/
isValidComponent(component) {
if (component === null || component === undefined) return true;
if (typeof component === 'string' || typeof component === 'number') return true;
if (typeof component === 'function') return true;
if (Array.isArray(component)) return component.every(child => this.isValidComponent(child));
if (isCoherentObject(component)) return true;
return false;
}
/**
* Validate rendering depth to prevent stack overflow
*/
validateDepth(depth) {
if (depth > this.config.maxDepth) {
throw new Error(`Maximum render depth (${this.config.maxDepth}) exceeded`);
}
}
/**
* Handle different component types with consistent logic
*/
processComponentType(component) {
// Null/undefined
if (component === null || component === undefined) {
return { type: 'empty', value: '' };
}
// String
if (typeof component === 'string') {
return { type: 'text', value: component };
}
// Number/Boolean
if (typeof component === 'number' || typeof component === 'boolean') {
return { type: 'text', value: String(component) };
}
// Function
if (typeof component === 'function') {
return { type: 'function', value: component };
}
// Array
if (Array.isArray(component)) {
return { type: 'array', value: component };
}
// Object (Coherent element)
if (isCoherentObject(component)) {
return { type: 'element', value: component };
}
// Unknown type
return { type: 'unknown', value: component };
}
/**
* Execute function components with error handling
*/
executeFunctionComponent(func, depth = 0) {
try {
// Check if this is a context provider by checking function arity or a marker
const isContextProvider = func.length > 0 || func.isContextProvider;
let result;
if (isContextProvider) {
// Call with render function for context providers
result = func((children) => {
return this.renderComponent(children, this.config, depth + 1);
});
} else {
// Regular function component
result = func();
}
// Handle case where function returns another function
if (typeof result === 'function') {
return this.executeFunctionComponent(result, depth);
}
return result;
} catch (error) {
if (this.config.enableMonitoring) {
performanceMonitor.recordError('functionComponent', error);
}
// In development, provide detailed error info
if (typeof process !== 'undefined' && process.env && process.env.NODE_ENV === 'development') {
console.warn('Coherent.js Function Component Error:', error.message);
}
return null;
}
}
/**
* Process element children consistently
*/
processChildren(children, options, depth) {
if (!hasChildren({ children })) {
return [];
}
const normalizedChildren = normalizeChildren(children);
return normalizedChildren.map(child =>
this.renderComponent(child, options, depth + 1)
);
}
/**
* Extract and process element attributes
*/
extractElementAttributes(props) {
if (!props || typeof props !== 'object') return {};
const attributes = { ...props };
delete attributes.children;
delete attributes.text;
return attributes;
}
/**
* Record performance metrics
*/
recordPerformance(operation, startTime, fromCache = false, metadata = {}) {
if (this.config.enableMonitoring) {
performanceMonitor.recordRender(
operation,
this.getCurrentTime() - startTime,
fromCache,
metadata
);
}
}
/**
* Record error for monitoring
*/
recordError(operation, error, metadata = {}) {
if (this.config.enableMonitoring) {
performanceMonitor.recordError(operation, error, metadata);
}
}
/**
* Get current timestamp with fallback
*/
getCurrentTime() {
if (typeof performance !== 'undefined' && performance.now) {
return performance.now();
}
return Date.now();
}
/**
* Start performance timing
*/
startTiming() {
this.metrics.startTime = this.getCurrentTime();
}
/**
* End performance timing
*/
endTiming() {
this.metrics.endTime = this.getCurrentTime();
}
/**
* Get performance metrics
*/
getMetrics() {
const duration = this.metrics.endTime ?
this.metrics.endTime - this.metrics.startTime :
this.getCurrentTime() - this.metrics.startTime;
return {
...this.metrics,
duration,
elementsPerSecond: this.metrics.elementsProcessed / (duration / 1000)
};
}
/**
* Reset metrics for new render
*/
resetMetrics() {
this.metrics = {
startTime: null,
endTime: null,
elementsProcessed: 0
};
}
/**
* Abstract method - must be implemented by subclasses
*/
renderComponent() {
throw new Error('renderComponent must be implemented by subclass');
}
/**
* Abstract method - must be implemented by subclasses
*/
render() {
throw new Error('render must be implemented by subclass');
}
}
/**
* Utility functions for renderer implementations
*/
export const RendererUtils = {
/**
* Check if element is static (no functions)
*/
isStaticElement(element) {
if (!element || typeof element !== 'object') {
return typeof element === 'string' || typeof element === 'number';
}
// Check if element has any dynamic content
for (const [key, value] of Object.entries(element)) {
if (typeof value === 'function') return false;
if (key === 'children' && Array.isArray(value)) {
// Recursively check children for dynamic content
return value.every(child => RendererUtils.isStaticElement(child));
}
if (key === 'children' && typeof value === 'object' && value !== null) {
return RendererUtils.isStaticElement(value);
}
}
return true;
},
/**
* Check if object has functions (for caching decisions)
*/
hasFunctions(obj, visited = new WeakSet()) {
if (visited.has(obj)) return false;
visited.add(obj);
for (const value of Object.values(obj)) {
if (typeof value === 'function') return true;
if (typeof value === 'object' && value !== null && RendererUtils.hasFunctions(value, visited)) {
return true;
}
}
return false;
},
/**
* Get element complexity score
*/
getElementComplexity(element) {
if (!element || typeof element !== 'object') return 1;
let complexity = Object.keys(element).length;
if (element.children && Array.isArray(element.children)) {
complexity += element.children.reduce(
(sum, child) => sum + RendererUtils.getElementComplexity(child),
0
);
}
return complexity;
},
/**
* Generate cache key for element
*/
generateCacheKey(tagName, element) {
try {
// Create a stable cache key for the element
const keyData = {
tag: tagName,
props: extractProps(element),
hasChildren: hasChildren(element),
childrenType: Array.isArray(element.children) ? 'array' : typeof element.children
};
return `element:${JSON.stringify(keyData)}`;
} catch (error) {
// Log error in development mode
if (typeof process !== 'undefined' && process.env && process.env.NODE_ENV === 'development') {
console.warn('Failed to generate cache key:', error);
}
// Return null to indicate uncacheable element
return null;
}
},
/**
* Check if element is cacheable
*/
isCacheable(element, options) {
// Don't cache if caching is disabled
if (!options.enableCache) return false;
// Don't cache elements with functions (dynamic content)
if (RendererUtils.hasFunctions(element)) return false;
// Don't cache very large elements (memory consideration)
if (RendererUtils.getElementComplexity(element) > 1000) return false;
// Don't cache if we can't generate a stable cache key
const cacheKey = RendererUtils.generateCacheKey(element.tagName || 'unknown', element);
if (!cacheKey) return false;
return true;
}
};
export default BaseRenderer;
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