初始化

node_modules/cheerio/src/utils.ts

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+import type { AnyNode } from 'domhandler';
+import type { Cheerio } from './cheerio.js';
+
+/**
+ * Checks if an object is a Cheerio instance.
+ *
+ * @category Utils
+ * @param maybeCheerio - The object to check.
+ * @returns Whether the object is a Cheerio instance.
+ */
+export function isCheerio<T>(
+  maybeCheerio: unknown,
+): maybeCheerio is Cheerio<T> {
+  return (maybeCheerio as Cheerio<T>).cheerio != null;
+}
+
+/**
+ * Convert a string to camel case notation.
+ *
+ * @private
+ * @category Utils
+ * @param str - The string to be converted.
+ * @returns String in camel case notation.
+ */
+export function camelCase(str: string): string {
+  return str.replace(/[._-](\w|$)/g, (_, x) => (x as string).toUpperCase());
+}
+
+/**
+ * Convert a string from camel case to "CSS case", where word boundaries are
+ * described by hyphens ("-") and all characters are lower-case.
+ *
+ * @private
+ * @category Utils
+ * @param str - The string to be converted.
+ * @returns String in "CSS case".
+ */
+export function cssCase(str: string): string {
+  return str.replace(/[A-Z]/g, '-$&').toLowerCase();
+}
+
+/**
+ * Iterate over each DOM element without creating intermediary Cheerio
+ * instances.
+ *
+ * This is indented for use internally to avoid otherwise unnecessary memory
+ * pressure introduced by _make.
+ *
+ * @category Utils
+ * @param array - The array to iterate over.
+ * @param fn - Function to call.
+ * @returns The original instance.
+ */
+export function domEach<
+  T extends AnyNode,
+  Arr extends ArrayLike<T> = Cheerio<T>,
+>(array: Arr, fn: (elem: T, index: number) => void): Arr {
+  const len = array.length;
+  for (let i = 0; i < len; i++) fn(array[i], i);
+  return array;
+}
+
+const enum CharacterCode {
+  LowerA = 97,
+  LowerZ = 122,
+  UpperA = 65,
+  UpperZ = 90,
+  Exclamation = 33,
+}
+
+/**
+ * Check if string is HTML.
+ *
+ * Tests for a `<` within a string, immediate followed by a letter and
+ * eventually followed by a `>`.
+ *
+ * @private
+ * @category Utils
+ * @param str - The string to check.
+ * @returns Indicates if `str` is HTML.
+ */
+export function isHtml(str: string): boolean {
+  const tagStart = str.indexOf('<');
+
+  if (tagStart === -1 || tagStart > str.length - 3) return false;
+
+  const tagChar = str.charCodeAt(tagStart + 1) as CharacterCode;
+
+  return (
+    ((tagChar >= CharacterCode.LowerA && tagChar <= CharacterCode.LowerZ) ||
+      (tagChar >= CharacterCode.UpperA && tagChar <= CharacterCode.UpperZ) ||
+      tagChar === CharacterCode.Exclamation) &&
+    str.includes('>', tagStart + 2)
+  );
+}