firefox

firefox/safaribooks/utils.js

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+const INVALID_DIR_CHARS = /[~#%&*{}\\<>?/`'"|+:]/g;
+const IMAGE_EXTENSIONS = new Set(["jpg", "jpeg", "png", "gif", "svg", "webp"]);
+const FONT_EXTENSIONS = new Set(["otf", "ttf", "woff", "woff2", "eot"]);
+
+export function cleanDirectoryName(name) {
+  let sanitized = name;
+  if (sanitized.includes(":")) {
+    if (sanitized.indexOf(":") > 15) {
+      sanitized = sanitized.split(":")[0];
+    } else {
+      sanitized = sanitized.replace(/:/g, ",");
+    }
+  }
+  sanitized = sanitized.replace(INVALID_DIR_CHARS, "_");
+  return sanitized.replace(/\s+/g, " ").trim();
+}
+
+export function makeFolderFriendlyName(title, bookId) {
+  const safeTitle = cleanDirectoryName(title);
+  const prefix = safeTitle.split(",").slice(0, 2).join(",");
+  return `${prefix || safeTitle} (${bookId})`.trim();
+}
+
+export function makeFileFriendlyName(...segments) {
+  const cleaned = segments
+    .map((segment) => segment ?? "")
+    .map((segment) => cleanDirectoryName(String(segment)))
+    .filter((segment) => segment.length > 0);
+
+  if (!cleaned.length) {
+    return "download";
+  }
+
+  return cleaned.join(" - ").replace(/\s+/g, " ").trim();
+}
+
+export function escapeXml(value) {
+  return value
+    .replace(/&/g, "&amp;")
+    .replace(/</g, "&lt;")
+    .replace(/>/g, "&gt;")
+    .replace(/"/g, "&quot;")
+    .replace(/'/g, "&apos;");
+}
+
+export function isAbsoluteUrl(url) {
+  try {
+    const parsed = new URL(url);
+    return Boolean(parsed.protocol);
+  } catch (_) {
+    return false;
+  }
+}
+
+export function isDocLink(url) {
+  return [".html", ".xhtml", ".pdf"].some((ext) => url.includes(ext));
+}
+
+export function isImageLink(url) {
+  const lowered = url.toLowerCase();
+  if (lowered.includes("cover") || lowered.includes("images") || lowered.includes("graphics")) {
+    return true;
+  }
+  const ext = lowered.split(".").pop();
+  return IMAGE_EXTENSIONS.has(ext);
+}
+
+export function isFontUrl(url) {
+  const ext = url.toLowerCase().split(".").pop().split("?")[0];
+  return FONT_EXTENSIONS.has(ext);
+}
+
+export function isLikelyImageAsset(url) {
+  const ext = url.toLowerCase().split(".").pop().split("?")[0];
+  return IMAGE_EXTENSIONS.has(ext);
+}
+
+export function makeValidId(value) {
+  const sanitized = value.replace(/\W|^(?=\d)/g, "_");
+  return sanitized[0]?.match(/\d/) ? `_${sanitized}` : sanitized;
+}
+
+export function resolveStylesRelativePath(relativePath) {
+  const baseParts = ["Styles"];
+  const segments = relativePath.split("/").filter(Boolean);
+  const resolved = [];
+  for (const segment of segments) {
+    if (segment === ".") {
+      continue;
+    }
+    if (segment === "..") {
+      if (resolved.length) {
+        resolved.pop();
+      } else if (baseParts.length) {
+        baseParts.pop();
+      }
+      continue;
+    }
+    resolved.push(segment);
+  }
+  return [...baseParts, ...resolved].join("/");
+}
+
+export function ensureForwardSlashes(path) {
+  return path.replace(/\\/g, "/");
+}
+
+export function uniqPush(collection, value) {
+  if (!collection.includes(value)) {
+    collection.push(value);
+  }
+  return collection.indexOf(value);
+}
+
+export function dataFromString(value) {
+  const encoder = new TextEncoder();
+  return encoder.encode(value);
+}
+
+export function toHex(value, width = 8) {
+  return value.toString(16).padStart(width, "0");
+}