Create theme-collector.js

Author: lumosframework

theme-collector.js

@@ -0,0 +1,81 @@
+/**
+ * Theme Collector 1.0.6
+ * Released under the MIT License
+ * Released on: January 17, 2025
+ */
+function getColorThemes() {
+  const STORAGE_KEYS = { THEMES: 'colorThemes_data', PUBLISH_DATE: 'colorThemes_publishDate' };
+  function getPublishDate() {
+    const htmlComment = document.documentElement.previousSibling;
+    return htmlComment?.nodeType === Node.COMMENT_NODE ? new Date(htmlComment.textContent.match(/Last Published: (.+?) GMT/)[1]).getTime() : null;
+  }
+
+  function loadFromStorage() {
+    try {
+      const storedPublishDate = localStorage.getItem(STORAGE_KEYS.PUBLISH_DATE), currentPublishDate = getPublishDate();
+      if (!currentPublishDate || !storedPublishDate || storedPublishDate !== currentPublishDate.toString()) return null;
+      return JSON.parse(localStorage.getItem(STORAGE_KEYS.THEMES));
+    } catch (error) { console.warn('Failed to load from localStorage:', error); return null; }
+  }
+
+  function saveToStorage(themes) {
+    try {
+      const publishDate = getPublishDate();
+      if (publishDate) {
+        localStorage.setItem(STORAGE_KEYS.PUBLISH_DATE, publishDate.toString());
+        localStorage.setItem(STORAGE_KEYS.THEMES, JSON.stringify(themes));
+      }
+    } catch (error) { console.warn('Failed to save to localStorage:', error); }
+  }
+
+  window.colorThemes = { themes: {}, getTheme(themeName = '', brandName = '') {
+    if (!themeName) return this.getTheme(Object.keys(this.themes)[0], brandName);
+    const theme = this.themes[themeName];
+    if (!theme) return {};
+    if (!theme.brands || Object.keys(theme.brands).length === 0) return theme;
+    if (!brandName) return theme.brands[Object.keys(theme.brands)[0]];
+    return theme.brands[brandName] || {};
+  }};
+
+  const cachedThemes = loadFromStorage();
+  if (cachedThemes) { window.colorThemes.themes = cachedThemes; document.dispatchEvent(new CustomEvent("colorThemesReady")); return; }
+
+  const firstLink = document.querySelector('link[rel="stylesheet"]');
+  if (!firstLink?.href) return null;
+
+  const themeVariables = new Set(), themeClasses = new Set(), brandClasses = new Set();
+
+  fetch(firstLink.href)
+    .then(response => { if (!response.ok) throw new Error(`Failed to fetch stylesheet: ${response.statusText}`); return response.text(); })
+    .then(cssText => {
+      (cssText.match(/--_theme[\w-]+:\s*[^;]+/g) || []).forEach(variable => themeVariables.add(variable.split(":")[0].trim()));
+      (cssText.match(/\.u-(theme|brand)-[\w-]+/g) || []).forEach(className => {
+        if (className.startsWith(".u-theme-")) themeClasses.add(className);
+        if (className.startsWith(".u-brand-")) brandClasses.add(className);
+      });
+
+      const themeVariablesArray = Array.from(themeVariables);
+      function checkClass(themeClass, brandClass = null) {
+        document.documentElement.classList.add(themeClass, brandClass); 
+        const styleObject = {};
+        themeVariablesArray.forEach(variable => styleObject[variable] = getComputedStyle(document.documentElement).getPropertyValue(variable));
+        document.documentElement.classList.remove(themeClass, brandClass);
+        return styleObject;
+      }
+
+      themeClasses.forEach(themeClassWithDot => {
+        const themeName = themeClassWithDot.replace(".", "").replace("u-theme-", "");
+        window.colorThemes.themes[themeName] = { brands: {} };
+        brandClasses.forEach(brandClassWithDot => {
+          const brandName = brandClassWithDot.replace(".", "").replace("u-brand-", "");
+          window.colorThemes.themes[themeName].brands[brandName] = checkClass(themeClassWithDot, brandClassWithDot);
+        });
+        if (!brandClasses.size) window.colorThemes.themes[themeName] = checkClass(themeClassWithDot);
+      });
+
+      saveToStorage(window.colorThemes.themes);
+      document.dispatchEvent(new CustomEvent("colorThemesReady"));
+    })
+    .catch(error => console.error("Error:", error.message));
+}
+getColorThemes();