node_modules

1 files changed, 148 insertions, 0 deletions

diff --git a/node_modules/to-regex/index.js b/node_modules/to-regex/index.js
new file mode 100644
index 000000000..9c93def8c
--- /dev/null
+++ b/node_modules/to-regex/index.js
@@ -0,0 +1,148 @@
+'use strict';
+
+var define = require('define-property');
+var extend = require('extend-shallow');
+var not = require('regex-not');
+var MAX_LENGTH = 1024 * 64;
+
+/**
+ * Session cache
+ */
+
+var cache = {};
+
+/**
+ * Create a regular expression from the given `pattern` string.
+ *
+ * @param {String|RegExp} `pattern` Pattern can be a string or regular expression.
+ * @param {Object} `options`
+ * @return {RegExp}
+ * @api public
+ */
+
+module.exports = function(patterns, options) {
+  if (!Array.isArray(patterns)) {
+    return makeRe(patterns, options);
+  }
+  return makeRe(patterns.join('|'), options);
+};
+
+/**
+ * Create a regular expression from the given `pattern` string.
+ *
+ * @param {String|RegExp} `pattern` Pattern can be a string or regular expression.
+ * @param {Object} `options`
+ * @return {RegExp}
+ * @api public
+ */
+
+function makeRe(pattern, options) {
+  if (pattern instanceof RegExp) {
+    return pattern;
+  }
+
+  if (typeof pattern !== 'string') {
+    throw new TypeError('expected a string');
+  }
+
+  if (pattern.length > MAX_LENGTH) {
+    throw new Error('expected pattern to be less than ' + MAX_LENGTH + ' characters');
+  }
+
+  var key = pattern;
+  // do this before shallow cloning options, it's a lot faster
+  if (!options || (options && options.cache !== false)) {
+    key = createKey(pattern, options);
+
+    if (cache.hasOwnProperty(key)) {
+      return cache[key];
+    }
+  }
+
+  var opts = extend({}, options);
+  if (opts.contains === true) {
+    if (opts.negate === true) {
+      opts.strictNegate = false;
+    } else {
+      opts.strict = false;
+    }
+  }
+
+  if (opts.strict === false) {
+    opts.strictOpen = false;
+    opts.strictClose = false;
+  }
+
+  var open = opts.strictOpen !== false ? '^' : '';
+  var close = opts.strictClose !== false ? '$' : '';
+  var flags = opts.flags || '';
+  var regex;
+
+  if (opts.nocase === true && !/i/.test(flags)) {
+    flags += 'i';
+  }
+
+  try {
+    if (opts.negate || typeof opts.strictNegate === 'boolean') {
+      pattern = not.create(pattern, opts);
+    }
+    var str = open + '(?:' + pattern + ')' + close;
+    regex = new RegExp(str, flags);
+  } catch (err) {
+    if (opts.strictErrors === true) {
+      err.key = key;
+      err.pattern = pattern;
+      err.originalOptions = options;
+      err.createdOptions = opts;
+      throw err;
+    }
+
+    try {
+      regex = new RegExp('^' + pattern.replace(/(\W)/g, '\\$1') + '$');
+    } catch (err) {
+      regex = /.^/; //<= match nothing
+    }
+  }
+
+  if (opts.cache !== false) {
+    cacheRegex(regex, key, pattern, opts);
+  }
+  return regex;
+}
+
+/**
+ * Cache generated regex. This can result in dramatic speed improvements
+ * and simplify debugging by adding options and pattern to the regex. It can be
+ * disabled by passing setting `options.cache` to false.
+ */
+
+function cacheRegex(regex, key, pattern, options) {
+  define(regex, 'cached', true);
+  define(regex, 'pattern', pattern);
+  define(regex, 'options', options);
+  define(regex, 'key', key);
+  cache[key] = regex;
+}
+
+/**
+ * Create the key to use for memoization. The key is generated
+ * by iterating over the options and concatenating key-value pairs
+ * to the pattern string.
+ */
+
+function createKey(pattern, options) {
+  if (!options) return pattern;
+  var key = pattern;
+  for (var prop in options) {
+    if (options.hasOwnProperty(prop)) {
+      key += ';' + prop + '=' + String(options[prop]);
+    }
+  }
+  return key;
+}
+
+/**
+ * Expose `makeRe`
+ */
+
+module.exports.makeRe = makeRe;