fix

book/node_modules/highlight.js/es/utils/regex.js

@@ -0,0 +1,155 @@
+/**
+ * @param {string} value
+ * @returns {RegExp}
+ * */
+function escape(value) {
+  return new RegExp(value.replace(/[-/\\^$*+?.()|[\]{}]/g, '\\$&'), 'm');
+}
+
+/**
+ * @param {RegExp | string } re
+ * @returns {string}
+ */
+function source(re) {
+  if (!re) return null;
+  if (typeof re === "string") return re;
+
+  return re.source;
+}
+
+/**
+ * @param {RegExp | string } re
+ * @returns {string}
+ */
+function lookahead(re) {
+  return concat('(?=', re, ')');
+}
+
+/**
+ * @param {RegExp | string } re
+ * @returns {string}
+ */
+function anyNumberOfTimes(re) {
+  return concat('(?:', re, ')*');
+}
+
+/**
+ * @param {RegExp | string } re
+ * @returns {string}
+ */
+function optional(re) {
+  return concat('(?:', re, ')?');
+}
+
+/**
+ * @param {...(RegExp | string) } args
+ * @returns {string}
+ */
+function concat(...args) {
+  const joined = args.map((x) => source(x)).join("");
+  return joined;
+}
+
+/**
+ * @param { Array<string | RegExp | Object> } args
+ * @returns {object}
+ */
+function stripOptionsFromArgs(args) {
+  const opts = args[args.length - 1];
+
+  if (typeof opts === 'object' && opts.constructor === Object) {
+    args.splice(args.length - 1, 1);
+    return opts;
+  } else {
+    return {};
+  }
+}
+
+/** @typedef { {capture?: boolean} } RegexEitherOptions */
+
+/**
+ * Any of the passed expresssions may match
+ *
+ * Creates a huge this | this | that | that match
+ * @param {(RegExp | string)[] | [...(RegExp | string)[], RegexEitherOptions]} args
+ * @returns {string}
+ */
+function either(...args) {
+  /** @type { object & {capture?: boolean} }  */
+  const opts = stripOptionsFromArgs(args);
+  const joined = '('
+    + (opts.capture ? "" : "?:")
+    + args.map((x) => source(x)).join("|") + ")";
+  return joined;
+}
+
+/**
+ * @param {RegExp | string} re
+ * @returns {number}
+ */
+function countMatchGroups(re) {
+  return (new RegExp(re.toString() + '|')).exec('').length - 1;
+}
+
+/**
+ * Does lexeme start with a regular expression match at the beginning
+ * @param {RegExp} re
+ * @param {string} lexeme
+ */
+function startsWith(re, lexeme) {
+  const match = re && re.exec(lexeme);
+  return match && match.index === 0;
+}
+
+// BACKREF_RE matches an open parenthesis or backreference. To avoid
+// an incorrect parse, it additionally matches the following:
+// - [...] elements, where the meaning of parentheses and escapes change
+// - other escape sequences, so we do not misparse escape sequences as
+//   interesting elements
+// - non-matching or lookahead parentheses, which do not capture. These
+//   follow the '(' with a '?'.
+const BACKREF_RE = /\[(?:[^\\\]]|\\.)*\]|\(\??|\\([1-9][0-9]*)|\\./;
+
+// **INTERNAL** Not intended for outside usage
+// join logically computes regexps.join(separator), but fixes the
+// backreferences so they continue to match.
+// it also places each individual regular expression into it's own
+// match group, keeping track of the sequencing of those match groups
+// is currently an exercise for the caller. :-)
+/**
+ * @param {(string | RegExp)[]} regexps
+ * @param {{joinWith: string}} opts
+ * @returns {string}
+ */
+function _rewriteBackreferences(regexps, { joinWith }) {
+  let numCaptures = 0;
+
+  return regexps.map((regex) => {
+    numCaptures += 1;
+    const offset = numCaptures;
+    let re = source(regex);
+    let out = '';
+
+    while (re.length > 0) {
+      const match = BACKREF_RE.exec(re);
+      if (!match) {
+        out += re;
+        break;
+      }
+      out += re.substring(0, match.index);
+      re = re.substring(match.index + match[0].length);
+      if (match[0][0] === '\\' && match[1]) {
+        // Adjust the backreference.
+        out += '\\' + String(Number(match[1]) + offset);
+      } else {
+        out += match[0];
+        if (match[0] === '(') {
+          numCaptures++;
+        }
+      }
+    }
+    return out;
+  }).map(re => `(${re})`).join(joinWith);
+}
+
+export { _rewriteBackreferences, anyNumberOfTimes, concat, countMatchGroups, either, escape, lookahead, optional, source, startsWith };