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* @fileoverview Rendering Pipeline Hooks for Coherent.js
* Provides customizable rendering pipeline with hooks and middleware
* @module @coherentjs/core/rendering/render-pipeline
*/
/**
* @typedef {Object} RenderPipelineOptions
* @property {Array<Function>} [beforeRender] - Hooks called before rendering
* @property {Array<Function>} [afterRender] - Hooks called after rendering
* @property {Array<Function>} [middleware] - Middleware functions
* @property {Object<string, Function>} [customRenderers] - Custom element renderers
* @property {boolean} [escapeHTML=true] - Escape HTML by default
* @property {Function} [escapeFunction] - Custom HTML escape function
* @property {boolean} [enableCache=false] - Enable render result caching
* @property {Function} [shouldCache] - Function to determine if result should be cached
* @property {boolean} [debug=false] - Enable debug logging
* @property {Object} [performance] - Performance monitoring options
*/
/**
* @typedef {Object} RenderContext
* @property {Object} component - Component being rendered
* @property {Object} props - Component props
* @property {Object} state - Component state
* @property {string} path - Component path in tree
* @property {number} depth - Nesting depth
* @property {Object} metadata - Custom metadata
*/
/**
* Default HTML escape function
* @param {string} str - String to escape
* @returns {string} Escaped string
*/
function defaultEscapeHTML(str) {
if (typeof str !== 'string') return str;
return str
.replace(/&/g, '&')
.replace(/</g, '<')
.replace(/>/g, '>')
.replace(/"/g, '"')
.replace(/'/g, ''');
}
/**
* Create render pipeline
* @param {RenderPipelineOptions} options - Pipeline options
* @returns {Object} Render pipeline
*/
export function createRenderPipeline(options = {}) {
const opts = {
beforeRender: [],
afterRender: [],
middleware: [],
customRenderers: {},
escapeHTML: true,
escapeFunction: defaultEscapeHTML,
enableCache: false,
shouldCache: null,
debug: false,
performance: {
enabled: false,
logSlowRenders: false,
threshold: 10
},
...options
};
const cache = new Map();
const stats = {
renders: 0,
cacheHits: 0,
cacheMisses: 0,
totalTime: 0,
slowRenders: 0
};
/**
* Execute hooks
* @param {Array<Function>} hooks - Hooks to execute
* @param {RenderContext} context - Render context
* @returns {Promise<RenderContext>} Modified context
*/
async function executeHooks(hooks, context) {
let ctx = { ...context };
for (const hook of hooks) {
try {
const result = await hook(ctx);
if (result !== undefined) {
ctx = { ...ctx, ...result };
}
} catch (error) {
if (opts.debug) {
console.error('Hook execution error:', error);
}
throw error;
}
}
return ctx;
}
/**
* Execute middleware
* @param {Object} component - Component to render
* @param {RenderContext} context - Render context
* @returns {Promise<Object>} Modified component
*/
async function executeMiddleware(component, context) {
let comp = component;
for (const middleware of opts.middleware) {
try {
const result = await middleware(comp, context);
if (result !== undefined) {
comp = result;
}
} catch (error) {
if (opts.debug) {
console.error('Middleware execution error:', error);
}
throw error;
}
}
return comp;
}
/**
* Render element
* @param {Object} element - Element to render
* @param {RenderContext} context - Render context
* @returns {string} Rendered HTML
*/
function renderElement(element, context) {
if (!element || typeof element !== 'object') {
return opts.escapeHTML ? opts.escapeFunction(String(element || '')) : String(element || '');
}
const tag = Object.keys(element)[0];
const props = element[tag];
// Use custom renderer if available
if (opts.customRenderers[tag]) {
return opts.customRenderers[tag](props, context, renderElement);
}
if (!props) {
return `<${tag}></${tag}>`;
}
const attributes = [];
let content = '';
let selfClosing = false;
// Self-closing tags
const selfClosingTags = ['img', 'br', 'hr', 'input', 'meta', 'link', 'area', 'base', 'col', 'embed', 'param', 'source', 'track', 'wbr'];
if (selfClosingTags.includes(tag)) {
selfClosing = true;
}
Object.entries(props).forEach(([key, value]) => {
if (key === 'children') {
content = Array.isArray(value)
? value.map((child, idx) => renderElement(child, {
...context,
path: `${context.path}.children[${idx}]`,
depth: context.depth + 1
})).join('')
: renderElement(value, {
...context,
path: `${context.path}.children`,
depth: context.depth + 1
});
} else if (key === 'text') {
content = opts.escapeHTML ? opts.escapeFunction(String(value)) : String(value);
} else if (key === 'html') {
content = String(value);
} else if (key === 'dangerouslySetInnerHTML') {
content = value.__html || '';
} else if (!key.startsWith('on') && key !== 'ref' && key !== 'key') {
// Skip event handlers and special props
if (typeof value === 'boolean') {
if (value) {
attributes.push(key);
}
} else if (value !== null && value !== undefined) {
const escapedValue = opts.escapeHTML ? opts.escapeFunction(String(value)) : String(value);
attributes.push(`${key}="${escapedValue}"`);
}
}
});
const attrsStr = attributes.length > 0 ? ` ${ attributes.join(' ')}` : '';
if (selfClosing) {
return `<${tag}${attrsStr} />`;
}
return `<${tag}${attrsStr}>${content}</${tag}>`;
}
/**
* Render component
* @param {Object} component - Component to render
* @param {Object} initialContext - Initial context
* @returns {Promise<string>} Rendered HTML
*/
async function render(component, initialContext = {}) {
const startTime = opts.performance.enabled ? performance.now() : 0;
stats.renders++;
// Create render context
let context = {
component,
props: initialContext.props || {},
state: initialContext.state || {},
path: initialContext.path || 'root',
depth: initialContext.depth || 0,
metadata: initialContext.metadata || {},
...initialContext
};
try {
// Check cache
if (opts.enableCache) {
const cacheKey = JSON.stringify({ component, context });
if (cache.has(cacheKey)) {
stats.cacheHits++;
if (opts.debug) {
console.log('[RenderPipeline] Cache hit:', context.path);
}
return cache.get(cacheKey);
}
stats.cacheMisses++;
}
// Execute beforeRender hooks
if (opts.beforeRender.length > 0) {
context = await executeHooks(opts.beforeRender, context);
}
// Execute middleware
let processedComponent = component;
if (opts.middleware.length > 0) {
processedComponent = await executeMiddleware(component, context);
}
// Render
const result = renderElement(processedComponent, context);
// Execute afterRender hooks
if (opts.afterRender.length > 0) {
context.result = result;
const afterContext = await executeHooks(opts.afterRender, context);
if (afterContext.result !== undefined) {
const finalResult = afterContext.result;
// Cache result
if (opts.enableCache && (!opts.shouldCache || opts.shouldCache(processedComponent, context))) {
const cacheKey = JSON.stringify({ component, context });
cache.set(cacheKey, finalResult);
}
// Performance monitoring
if (opts.performance.enabled) {
const renderTime = performance.now() - startTime;
stats.totalTime += renderTime;
if (renderTime > opts.performance.threshold) {
stats.slowRenders++;
if (opts.performance.logSlowRenders) {
console.warn(`[RenderPipeline] Slow render (${renderTime.toFixed(2)}ms):`, context.path);
}
}
}
return finalResult;
}
}
// Cache result
if (opts.enableCache && (!opts.shouldCache || opts.shouldCache(processedComponent, context))) {
const cacheKey = JSON.stringify({ component, context });
cache.set(cacheKey, result);
}
// Performance monitoring
if (opts.performance.enabled) {
const renderTime = performance.now() - startTime;
stats.totalTime += renderTime;
if (renderTime > opts.performance.threshold) {
stats.slowRenders++;
if (opts.performance.logSlowRenders) {
console.warn(`[RenderPipeline] Slow render (${renderTime.toFixed(2)}ms):`, context.path);
}
}
}
return result;
} catch (error) {
if (opts.debug) {
console.error('[RenderPipeline] Render error:', error, 'at', context.path);
}
throw error;
}
}
/**
* Add hook
* @param {string} type - Hook type ('before' or 'after')
* @param {Function} hook - Hook function
*/
function addHook(type, hook) {
if (type === 'before') {
opts.beforeRender.push(hook);
} else if (type === 'after') {
opts.afterRender.push(hook);
}
}
/**
* Add middleware
* @param {Function} middleware - Middleware function
*/
function addMiddleware(middleware) {
opts.middleware.push(middleware);
}
/**
* Register custom renderer
* @param {string} tag - Element tag
* @param {Function} renderer - Renderer function
*/
function registerRenderer(tag, renderer) {
opts.customRenderers[tag] = renderer;
}
/**
* Clear render cache
*/
function clearCache() {
cache.clear();
if (opts.debug) {
console.log('[RenderPipeline] Cache cleared');
}
}
/**
* Get render statistics
* @returns {Object} Render stats
*/
function getStats() {
return {
...stats,
averageRenderTime: stats.renders > 0 ? stats.totalTime / stats.renders : 0,
cacheSize: cache.size,
cacheHitRate: stats.renders > 0 ? (stats.cacheHits / stats.renders) * 100 : 0
};
}
return {
render,
addHook,
addMiddleware,
registerRenderer,
clearCache,
getStats,
get options() {
return { ...opts };
}
};
}
/**
* Common middleware functions
*/
export const middleware = {
/**
* Add class name middleware
* @param {string|Function} className - Class name or function
* @returns {Function} Middleware function
*/
addClassName: (className) => (component, context) => {
const tag = Object.keys(component)[0];
const props = component[tag];
const additionalClass = typeof className === 'function'
? className(component, context)
: className;
if (!additionalClass) return component;
return {
[tag]: {
...props,
className: props.className
? `${props.className} ${additionalClass}`
: additionalClass
}
};
},
/**
* Add data attributes middleware
* @param {Object|Function} attributes - Data attributes
* @returns {Function} Middleware function
*/
addDataAttributes: (attributes) => (component, context) => {
const tag = Object.keys(component)[0];
const props = component[tag];
const attrs = typeof attributes === 'function'
? attributes(component, context)
: attributes;
return {
[tag]: {
...props,
...attrs
}
};
},
/**
* Wrap component middleware
* @param {Function} wrapper - Wrapper function
* @returns {Function} Middleware function
*/
wrap: (wrapper) => (component, context) => {
return wrapper(component, context);
},
/**
* Conditional rendering middleware
* @param {Function} condition - Condition function
* @param {Function} transform - Transform function
* @returns {Function} Middleware function
*/
conditional: (condition, transform) => (component, context) => {
if (condition(component, context)) {
return transform(component, context);
}
return component;
}
};
/**
* Common hooks
*/
export const hooks = {
/**
* Performance monitoring hook
* @returns {Function} Hook function
*/
performanceMonitor: () => (context) => {
const start = performance.now();
context.metadata.renderStart = start;
return {
...context,
metadata: {
...context.metadata,
renderStart: start
}
};
},
/**
* Debug logging hook
* @returns {Function} Hook function
*/
debugLog: () => (context) => {
const indent = ' '.repeat(context.depth);
console.log(`${indent}[Render] ${context.path}`, context.component);
return context;
},
/**
* Metadata injection hook
* @param {Object|Function} metadata - Metadata to inject
* @returns {Function} Hook function
*/
injectMetadata: (metadata) => (context) => {
const meta = typeof metadata === 'function'
? metadata(context)
: metadata;
return {
...context,
metadata: {
...context.metadata,
...meta
}
};
}
};
/**
* Create custom renderer
* @param {Function} renderFunction - Custom render function
* @returns {Function} Renderer function
*/
export function createCustomRenderer(renderFunction) {
return (props, context, renderElement) => {
return renderFunction(props, context, renderElement);
};
}
/**
* Common custom renderers
*/
export const customRenderers = {
/**
* Markdown renderer (basic)
* @param {Object} props - Component props
* @returns {string} Rendered HTML
*/
markdown: (props) => {
let content = props.text || props.children || '';
// Basic markdown transformations
content = content
.replace(/^### (.*$)/gm, '<h3>$1</h3>')
.replace(/^## (.*$)/gm, '<h2>$1</h2>')
.replace(/^# (.*$)/gm, '<h1>$1</h1>')
.replace(/\*\*(.*?)\*\*/g, '<strong>$1</strong>')
.replace(/\*(.*?)\*/g, '<em>$1</em>')
.replace(/\[(.*?)\]\((.*?)\)/g, '<a href="$2">$1</a>');
return `<div class="markdown">${content}</div>`;
},
/**
* Code block renderer with syntax highlighting markers
* @param {Object} props - Component props
* @returns {string} Rendered HTML
*/
codeBlock: (props) => {
const code = props.text || props.children || '';
const language = props.language || 'javascript';
return `<pre><code class="language-${language}">${defaultEscapeHTML(code)}</code></pre>`;
},
/**
* Icon renderer
* @param {Object} props - Component props
* @returns {string} Rendered HTML
*/
icon: (props) => {
const name = props.name || '';
const size = props.size || '24';
const color = props.color || 'currentColor';
return `<svg class="icon icon-${name}" width="${size}" height="${size}" fill="${color}"><use href="#icon-${name}"></use></svg>`;
}
};
export default {
createRenderPipeline,
createCustomRenderer,
middleware,
hooks,
customRenderers
};
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