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qwen/nodejs/node_modules/path-to-regexp/index.js

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+/**
+ * Expose `pathToRegexp`.
+ */
+
+module.exports = pathToRegexp;
+
+/**
+ * Match matching groups in a regular expression.
+ */
+var MATCHING_GROUP_REGEXP = /\\.|\((?:\?<(.*?)>)?(?!\?)/g;
+
+/**
+ * Normalize the given path string,
+ * returning a regular expression.
+ *
+ * An empty array should be passed,
+ * which will contain the placeholder
+ * key names. For example "/user/:id" will
+ * then contain ["id"].
+ *
+ * @param  {String|RegExp|Array} path
+ * @param  {Array} keys
+ * @param  {Object} options
+ * @return {RegExp}
+ * @api private
+ */
+
+function pathToRegexp(path, keys, options) {
+  options = options || {};
+  keys = keys || [];
+  var strict = options.strict;
+  var end = options.end !== false;
+  var flags = options.sensitive ? '' : 'i';
+  var lookahead = options.lookahead !== false;
+  var extraOffset = 0;
+  var keysOffset = keys.length;
+  var i = 0;
+  var name = 0;
+  var pos = 0;
+  var backtrack = '';
+  var m;
+
+  if (path instanceof RegExp) {
+    while (m = MATCHING_GROUP_REGEXP.exec(path.source)) {
+      if (m[0][0] === '\\') continue;
+
+      keys.push({
+        name: m[1] || name++,
+        optional: false,
+        offset: m.index
+      });
+    }
+
+    return path;
+  }
+
+  if (Array.isArray(path)) {
+    // Map array parts into regexps and return their source. We also pass
+    // the same keys and options instance into every generation to get
+    // consistent matching groups before we join the sources together.
+    path = path.map(function (value) {
+      return pathToRegexp(value, keys, options).source;
+    });
+
+    return new RegExp(path.join('|'), flags);
+  }
+
+  if (typeof path !== 'string') {
+    throw new TypeError('path must be a string, array of strings, or regular expression');
+  }
+
+  path = path.replace(
+    /\\.|(\/)?(\.)?:(\w+)(\(.*?\))?(\*)?(\?)?|[.*]|\/\(/g,
+    function (match, slash, format, key, capture, star, optional, offset) {
+      if (match[0] === '\\') {
+        backtrack += match;
+        pos += 2;
+        return match;
+      }
+
+      if (match === '.') {
+        backtrack += '\\.';
+        extraOffset += 1;
+        pos += 1;
+        return '\\.';
+      }
+
+      if (slash || format) {
+        backtrack = '';
+      } else {
+        backtrack += path.slice(pos, offset);
+      }
+
+      pos = offset + match.length;
+
+      if (match === '*') {
+        extraOffset += 3;
+        return '(.*)';
+      }
+
+      if (match === '/(') {
+        backtrack += '/';
+        extraOffset += 2;
+        return '/(?:';
+      }
+
+      slash = slash || '';
+      format = format ? '\\.' : '';
+      optional = optional || '';
+      capture = capture ?
+        capture.replace(/\\.|\*/, function (m) { return m === '*' ? '(.*)' : m; }) :
+        (backtrack ? '((?:(?!/|' + backtrack + ').)+?)' : '([^/' + format + ']+?)');
+
+      keys.push({
+        name: key,
+        optional: !!optional,
+        offset: offset + extraOffset
+      });
+
+      var result = '(?:'
+        + format + slash + capture
+        + (star ? '((?:[/' + format + '].+?)?)' : '')
+        + ')'
+        + optional;
+
+      extraOffset += result.length - match.length;
+
+      return result;
+    });
+
+  // This is a workaround for handling unnamed matching groups.
+  while (m = MATCHING_GROUP_REGEXP.exec(path)) {
+    if (m[0][0] === '\\') continue;
+
+    if (keysOffset + i === keys.length || keys[keysOffset + i].offset > m.index) {
+      keys.splice(keysOffset + i, 0, {
+        name: name++, // Unnamed matching groups must be consistently linear.
+        optional: false,
+        offset: m.index
+      });
+    }
+
+    i++;
+  }
+
+  path += strict ? '' : path[path.length - 1] === '/' ? '?' : '/?';
+
+  // If the path is non-ending, match until the end or a slash.
+  if (end) {
+    path += '$';
+  } else if (path[path.length - 1] !== '/') {
+    path += lookahead ? '(?=/|$)' : '(?:/|$)';
+  }
+
+  return new RegExp('^' + path, flags);
+};