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* CSS Management System for Coherent.js
* Handles CSS file inclusion, inline styles, and optimization
*/
import fs from 'node:fs/promises';
import path from 'node:path';
/**
* CSS Manager Class
* Handles CSS file loading, processing, and injection
*/
export class CSSManager {
constructor(options = {}) {
this.options = {
basePath: process.cwd(),
minify: false,
cache: true,
autoprefixer: false,
...options
};
this.cache = new Map();
this.loadedFiles = new Set();
}
/**
* Load CSS file content
*/
async loadCSSFile(filePath) {
const fullPath = path.resolve(this.options.basePath, filePath);
const cacheKey = fullPath;
// Return cached content if available
if (this.options.cache && this.cache.has(cacheKey)) {
return this.cache.get(cacheKey);
}
try {
let content = await fs.readFile(fullPath, 'utf8');
// Basic minification if enabled
if (this.options.minify) {
content = this.minifyCSS(content);
}
// Cache the content
if (this.options.cache) {
this.cache.set(cacheKey, content);
}
this.loadedFiles.add(filePath);
return content;
} catch (_error) {
console.warn(`Failed to load CSS file: ${filePath}`, _error.message);
return '';
}
}
/**
* Load multiple CSS files
*/
async loadCSSFiles(filePaths) {
if (!Array.isArray(filePaths)) {
filePaths = [filePaths];
}
const cssContents = await Promise.all(
filePaths.map(filePath => this.loadCSSFile(filePath))
);
return cssContents.join('\n');
}
/**
* Generate CSS link tags for external files
*/
generateCSSLinks(filePaths, baseUrl = '/') {
if (!Array.isArray(filePaths)) {
filePaths = [filePaths];
}
return filePaths
.map(filePath => {
const href = filePath.startsWith('http')
? filePath
: `${baseUrl}${filePath}`.replace(/\/+/g, '/');
return `<link rel="stylesheet" href="${this.escapeHtml(href)}" />`;
})
.join('\n');
}
/**
* Generate inline style tag with CSS content
*/
generateInlineStyles(cssContent) {
if (!cssContent) return '';
return `<style type="text/css">\n${cssContent}\n</style>`;
}
/**
* Basic CSS minification
*/
minifyCSS(css) {
return css
.replace(/\/\*[\s\S]*?\*\//g, '') // Remove comments
.replace(/\s+/g, ' ') // Collapse whitespace
.replace(/;\s*}/g, '}') // Remove last semicolon in blocks
.replace(/{\s+/g, '{') // Remove space after opening brace
.replace(/;\s+/g, ';') // Remove space after semicolons
.trim();
}
/**
* Escape HTML entities
*/
escapeHtml(text) {
const div = { textContent: text };
return div.innerHTML || text;
}
/**
* Clear cache
*/
clearCache() {
this.cache.clear();
this.loadedFiles.clear();
}
/**
* Get loaded file list
*/
getLoadedFiles() {
return Array.from(this.loadedFiles);
}
}
/**
* Default CSS Manager instance
*/
export const defaultCSSManager = new CSSManager();
/**
* CSS processing utilities
*/
export const cssUtils = {
/**
* Process CSS options from render options
*/
processCSSOptions(options = {}) {
const {
css = {},
cssFiles = [],
inlineCSS = '',
cssLinks = [],
cssBasePath = process.cwd(),
cssMinify = false
} = options;
return {
files: Array.isArray(cssFiles) ? cssFiles : [cssFiles].filter(Boolean),
inline: inlineCSS || css.inline || '',
links: Array.isArray(cssLinks) ? cssLinks : [cssLinks].filter(Boolean),
basePath: css.basePath || cssBasePath,
minify: css.minify || cssMinify,
loadInline: css.loadInline !== false // default true
};
},
/**
* Generate complete CSS HTML for head section
*/
async generateCSSHtml(cssOptions, cssManager = defaultCSSManager) {
const cssHtmlParts = [];
// Process external CSS links
if (cssOptions.links.length > 0) {
cssHtmlParts.push(cssManager.generateCSSLinks(cssOptions.links));
}
// Process CSS files (inline or as links)
if (cssOptions.files.length > 0) {
if (cssOptions.loadInline) {
// Load and inline CSS files
const cssContent = await cssManager.loadCSSFiles(cssOptions.files);
if (cssContent) {
cssHtmlParts.push(cssManager.generateInlineStyles(cssContent));
}
} else {
// Generate link tags for CSS files
cssHtmlParts.push(cssManager.generateCSSLinks(cssOptions.files));
}
}
// Process inline CSS
if (cssOptions.inline) {
cssHtmlParts.push(cssManager.generateInlineStyles(cssOptions.inline));
}
return cssHtmlParts.join('\n');
}
};
/**
* Create a new CSS Manager instance
*/
export function createCSSManager(options = {}) {
return new CSSManager(options);
} |