feat: support modifiers proposal (#1)

Author: liuxingbaoyu

package-lock.json

@@ -34,7 +34,7 @@
   "devDependencies": {
     "codecov": "^3.8.3",
     "nyc": "^15.1.0",
-    "regjsparser": "^0.8.2",
+    "regjsparser": "^0.9.1",
     "request": "^2.88.2"
   }
 }

package.json

@@ -236,7 +236,14 @@
         }
         break;
       case 'ignore':
-        result += '?:';
+        if (node.modifierFlags) {
+          result += '?';
+          if(node.modifierFlags.enabling) result += node.modifierFlags.enabling;
+          if(node.modifierFlags.disabling) result += "-" + node.modifierFlags.disabling;
+          result += ':';
+        } else {
+          result += '?:';
+        }
         break;
       case 'lookahead':
         result += '?=';

regjsgen.js

@@ -54,6 +54,10 @@ function astNodesAreEquivalent(a, b) {
       var bNames = Object.keys(b).filter(function(name) { return name != "range" && name != "raw"; });
       var aNameCount = aNames.length;
 
+      if(a.type == "quantifier" && b.type == "quantifier" && a.symbol == null && b.symbol == "+"){
+        b.symbol = undefined;
+      }
+
       if (aNameCount == bNames.length) {
         for (var i = 0; i < aNameCount; ++i) {
           var name = aNames[i];