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backend/node_modules/obliterator/match.js

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+/**
+ * Obliterator Match Function
+ * ===========================
+ *
+ * Function returning an iterator over the matches of the given regex on the
+ * target string.
+ */
+var Iterator = require('./iterator.js');
+
+/**
+ * Match.
+ *
+ * @param  {RegExp}   pattern - Regular expression to use.
+ * @param  {string}   string  - Target string.
+ * @return {Iterator}
+ */
+module.exports = function match(pattern, string) {
+  var executed = false;
+
+  if (!(pattern instanceof RegExp))
+    throw new Error(
+      'obliterator/match: invalid pattern. Expecting a regular expression.'
+    );
+
+  if (typeof string !== 'string')
+    throw new Error('obliterator/match: invalid target. Expecting a string.');
+
+  return new Iterator(function () {
+    if (executed && !pattern.global) {
+      pattern.lastIndex = 0;
+      return {done: true};
+    }
+
+    executed = true;
+
+    var m = pattern.exec(string);
+
+    if (m) return {value: m};
+
+    pattern.lastIndex = 0;
+    return {done: true};
+  });
+};