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* Component Loader - Specialized loader for Coherent.js components
* Handles component registration, lazy loading, and dependency resolution
*/
import { universalLoader } from './universal-loader.js';
export class ComponentLoader {
constructor(options = {}) {
this.options = {
componentRegistry: new Map(),
lazyLoad: true,
preloadComponents: [],
componentPaths: {},
...options
};
this.loader = universalLoader;
this.loadingQueue = new Map();
this.dependencyGraph = new Map();
this.loadedComponents = new Set();
}
// Register a component with its metadata
registerComponent(name, componentOrPath, options = {}) {
const registration = {
name,
path: typeof componentOrPath === 'string' ? componentOrPath : null,
component: typeof componentOrPath === 'function' ? componentOrPath : null,
loaded: typeof componentOrPath === 'function',
dependencies: options.dependencies || [],
lazy: options.lazy !== false,
preload: options.preload || false,
metadata: options.metadata || {},
...options
};
this.options.componentRegistry.set(name, registration);
// Build dependency graph
if (registration.dependencies.length > 0) {
this.dependencyGraph.set(name, registration.dependencies);
}
// Auto-load if not lazy
if (!registration.lazy && registration.path && !registration.loaded) {
this.loadComponent(name);
}
return registration;
}
// Load a component by name
async loadComponent(name, options = {}) {
const registration = this.options.componentRegistry.get(name);
if (!registration) {
throw new Error(`Component '${name}' not found in registry`);
}
// Return already loaded component
if (registration.loaded && registration.component) {
return registration.component;
}
// Return existing loading promise
if (this.loadingQueue.has(name)) {
return this.loadingQueue.get(name);
}
// Create loading promise
const loadingPromise = this.doLoadComponent(registration, options);
this.loadingQueue.set(name, loadingPromise);
try {
const component = await loadingPromise;
// Update registration
registration.component = component;
registration.loaded = true;
this.loadedComponents.add(name);
return component;
} finally {
this.loadingQueue.delete(name);
}
}
async doLoadComponent(registration, options = {}) {
const { name, path, dependencies } = registration;
try {
// Load dependencies first
if (dependencies.length > 0) {
await this.loadDependencies(dependencies, options);
}
// Load the component module
let component;
if (path) {
const module = await this.loader.load(path, options);
// Extract component from module
component = this.extractComponent(module, name);
} else if (registration.component) {
component = registration.component;
} else {
throw new Error(`No component or path specified for '${name}'`);
}
// Process component (add metadata, wrap, etc.)
return this.processComponent(component, registration, options);
} catch (error) {
console.error(`Failed to load component '${name}':`, error);
throw error;
}
}
extractComponent(module, componentName) {
// Try different export patterns
if (module.default && typeof module.default === 'function') {
return module.default;
}
if (module[componentName] && typeof module[componentName] === 'function') {
return module[componentName];
}
// Look for the first function export
for (const [key, value] of Object.entries(module)) {
if (typeof value === 'function' && key !== 'default') {
return value;
}
}
throw new Error(`No valid component function found in module for '${componentName}'`);
}
processComponent(component, registration, options = {}) {
// Add component metadata
if (registration.metadata) {
Object.assign(component, {
$meta: registration.metadata,
$name: registration.name
});
}
// Wrap component with additional functionality if needed
if (options.wrapper) {
return options.wrapper(component, registration);
}
return component;
}
async loadDependencies(dependencies, options = {}) {
const dependencyPromises = dependencies.map(depName => {
return this.loadComponent(depName, options);
});
await Promise.all(dependencyPromises);
}
// Batch component loading
async loadComponents(componentNames, options = {}) {
const loadPromises = componentNames.map(name =>
this.loadComponent(name, options).catch(error => ({ error, name }))
);
const results = await Promise.all(loadPromises);
// Separate successful loads from errors
const loaded = {};
const errors = [];
results.forEach((result, index) => {
const name = componentNames[index];
if (result && result.error) {
errors.push({ name, error: result.error });
} else {
loaded[name] = result;
}
});
return { loaded, errors };
}
// Preload components
async preloadComponents(componentNames = null) {
const toPreload = componentNames || this.getPreloadableComponents();
const preloadResults = await Promise.allSettled(
toPreload.map(name => this.loadComponent(name, { preload: true }))
);
const results = {
successful: [],
failed: []
};
preloadResults.forEach((result, index) => {
const name = toPreload[index];
if (result.status === 'fulfilled') {
results.successful.push(name);
} else {
results.failed.push({ name, error: result.reason });
}
});
return results;
}
getPreloadableComponents() {
return Array.from(this.options.componentRegistry.values())
.filter(reg => reg.preload && !reg.loaded)
.map(reg => reg.name);
}
// Component discovery
async discoverComponents(basePath, options = {}) {
// This would scan directories/modules for component files
// Implementation depends on the environment
const discovered = [];
try {
if (typeof fetch !== 'undefined') {
// Browser-based discovery (limited)
discovered.push(...await this.discoverFromManifest(basePath, options));
} else if (typeof require !== 'undefined') {
// Node.js-based discovery
discovered.push(...await this.discoverFromFileSystem(basePath, options));
}
} catch (error) {
console.warn('Component discovery failed:', error);
}
return discovered;
}
async discoverFromManifest(basePath, _options = {}) {
try {
const manifestUrl = `${basePath}/components.json`;
const response = await fetch(manifestUrl);
const manifest = await response.json();
return manifest.components || [];
} catch {
return [];
}
}
async discoverFromFileSystem(basePath, _options = {}) {
// This would require file system access
// Placeholder for Node.js implementation
return [];
}
// Auto-registration from patterns
registerComponentPattern(pattern, options = {}) {
// Register components matching a pattern
// e.g., './components/*.js' -> register all JS files as components
this.componentPatterns = this.componentPatterns || [];
this.componentPatterns.push({ pattern, options });
}
// Dependency analysis
analyzeDependencies() {
const analysis = {
circular: [],
missing: [],
unused: [],
depth: new Map()
};
// Check for circular dependencies
analysis.circular = this.findCircularDependencies();
// Check for missing dependencies
analysis.missing = this.findMissingDependencies();
// Find unused components
analysis.unused = this.findUnusedComponents();
// Calculate dependency depths
analysis.depth = this.calculateDependencyDepths();
return analysis;
}
findCircularDependencies() {
const circular = [];
const visited = new Set();
const recursionStack = new Set();
const visit = (componentName, path = []) => {
if (recursionStack.has(componentName)) {
circular.push([...path, componentName]);
return;
}
if (visited.has(componentName)) return;
visited.add(componentName);
recursionStack.add(componentName);
const dependencies = this.dependencyGraph.get(componentName) || [];
dependencies.forEach(dep => {
visit(dep, [...path, componentName]);
});
recursionStack.delete(componentName);
};
Array.from(this.dependencyGraph.keys()).forEach(visit);
return circular;
}
findMissingDependencies() {
const missing = [];
for (const [component, dependencies] of this.dependencyGraph) {
for (const dep of dependencies) {
if (!this.options.componentRegistry.has(dep)) {
missing.push({ component, dependency: dep });
}
}
}
return missing;
}
findUnusedComponents() {
const used = new Set();
// Mark all dependencies as used
for (const dependencies of this.dependencyGraph.values()) {
dependencies.forEach(dep => used.add(dep));
}
// Find registered components not marked as used
const unused = [];
for (const name of this.options.componentRegistry.keys()) {
if (!used.has(name)) {
unused.push(name);
}
}
return unused;
}
calculateDependencyDepths() {
const depths = new Map();
const calculateDepth = (componentName, visited = new Set()) => {
if (depths.has(componentName)) {
return depths.get(componentName);
}
if (visited.has(componentName)) {
return Infinity; // Circular dependency
}
visited.add(componentName);
const dependencies = this.dependencyGraph.get(componentName) || [];
const maxDepth = dependencies.length === 0
? 0
: Math.max(...dependencies.map(dep => calculateDepth(dep, new Set(visited)))) + 1;
depths.set(componentName, maxDepth);
return maxDepth;
};
for (const componentName of this.options.componentRegistry.keys()) {
calculateDepth(componentName);
}
return depths;
}
// Utilities
getRegisteredComponents() {
return Array.from(this.options.componentRegistry.keys());
}
getLoadedComponents() {
return Array.from(this.loadedComponents);
}
getComponentInfo(name) {
return this.options.componentRegistry.get(name);
}
isComponentLoaded(name) {
return this.loadedComponents.has(name);
}
clearCache() {
this.loader.clearCache();
this.loadingQueue.clear();
}
getStats() {
return {
registered: this.options.componentRegistry.size,
loaded: this.loadedComponents.size,
loading: this.loadingQueue.size,
dependencies: this.dependencyGraph.size
};
}
}
// Factory function
export function createComponentLoader(options = {}) {
return new ComponentLoader(options);
}
// Default instance
export const componentLoader = new ComponentLoader();
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