feat: init

node_modules/regexp-tree/dist/optimizer/transforms/quantifier-range-to-symbol-transform.js

@@ -0,0 +1,74 @@
+/**
+ * The MIT License (MIT)
+ * Copyright (c) 2017-present Dmitry Soshnikov <dmitry.soshnikov@gmail.com>
+ */
+
+'use strict';
+
+/**
+ * A regexp-tree plugin to replace different range-based quantifiers
+ * with their symbol equivalents.
+ *
+ * a{0,} -> a*
+ * a{1,} -> a+
+ * a{1} -> a
+ *
+ * NOTE: the following is automatically handled in the generator:
+ *
+ * a{3,3} -> a{3}
+ */
+
+module.exports = {
+  Quantifier: function Quantifier(path) {
+    var node = path.node;
+
+
+    if (node.kind !== 'Range') {
+      return;
+    }
+
+    // a{0,} -> a*
+    rewriteOpenZero(path);
+
+    // a{1,} -> a+
+    rewriteOpenOne(path);
+
+    // a{1} -> a
+    rewriteExactOne(path);
+  }
+};
+
+function rewriteOpenZero(path) {
+  var node = path.node;
+
+
+  if (node.from !== 0 || node.to) {
+    return;
+  }
+
+  node.kind = '*';
+  delete node.from;
+}
+
+function rewriteOpenOne(path) {
+  var node = path.node;
+
+
+  if (node.from !== 1 || node.to) {
+    return;
+  }
+
+  node.kind = '+';
+  delete node.from;
+}
+
+function rewriteExactOne(path) {
+  var node = path.node;
+
+
+  if (node.from !== 1 || node.to !== 1) {
+    return;
+  }
+
+  path.parentPath.replace(path.parentPath.node.expression);
+}