From 35c36cc093fd3775d85d9b91cd44e0deebd8b5c1 Mon Sep 17 00:00:00 2001
From: HoJeong Go <seia@outlook.kr>
Date: Fri, 13 Dec 2024 15:20:25 +0900
Subject: [PATCH] feat: merge denyallow and to

---
 packages/adblocker/src/filters/network.ts | 21 +++++----------------
 packages/adblocker/test/parsing.test.ts   | 14 +++++++++-----
 2 files changed, 14 insertions(+), 21 deletions(-)

diff --git a/packages/adblocker/src/filters/network.ts b/packages/adblocker/src/filters/network.ts
index 6cae716f33..035e151940 100644
--- a/packages/adblocker/src/filters/network.ts
+++ b/packages/adblocker/src/filters/network.ts
@@ -153,7 +153,6 @@ export const enum NETWORK_FILTER_MASK {
   isHostnameAnchor = 1 << 28,
   isRedirectRule = 1 << 29,
   isRedirect = 1 << 30,
-  isTo = 1 << 31,
   // IMPORTANT: the mask is now full, no more options can be added
   // Consider creating a separate fitler type for isReplace if a new
   // network filter option is needed.
@@ -726,6 +725,7 @@ export default class NetworkFilter implements IFilter {
       // --------------------------------------------------------------------- //
       // parseOptions
       // --------------------------------------------------------------------- //
+      const denyallowEntities: Set<string> = new Set();
       for (const rawOption of getFilterOptions(line, optionsIndex + 1, line.length)) {
         const negation = rawOption[0].charCodeAt(0) === 126; /* '~' */
         const option = negation === true ? rawOption[0].slice(1) : rawOption[0];
@@ -734,17 +734,14 @@ export default class NetworkFilter implements IFilter {
         switch (option) {
           case 'to':
           case 'denyallow': {
-            if (denyallow !== undefined) {
-              return null;
-            }
             let parts = value.split('|');
             if (option === 'to') {
-              mask = setBit(mask, NETWORK_FILTER_MASK.isTo);
               parts = parts.map((part) =>
                 part.charCodeAt(0) === 126 /* '~' */ ? part.slice(1) : `~${part}`,
               );
             }
-            denyallow = Domains.parse(parts, debug);
+            parts.forEach((part) => denyallowEntities.add(part));
+            denyallow = Domains.parse(Array.from(denyallowEntities), debug);
             break;
           }
           case 'domain':
@@ -1536,14 +1533,10 @@ export default class NetworkFilter implements IFilter {
     }
 
     if (this.denyallow !== undefined) {
-      const optionName = this.isTo() ? 'to' : 'denyallow';
       if (this.denyallow.parts !== undefined) {
-        const parts = this.denyallow.parts.split(',');
-        options.push(
-          `${optionName}=${this.isTo() ? parts.map((part) => (part.charCodeAt(0) === 126 /* '~' */ ? part.slice(1) : `~${part}`)).join('|') : parts.join('|')}`,
-        );
+        options.push(`denyallow=${this.denyallow.parts.replace(/,/g, '|')}`);
       } else {
-        options.push(`${optionName}=<hashed>`);
+        options.push('denyallow=<hashed>');
       }
     }
 
@@ -1834,10 +1827,6 @@ export default class NetworkFilter implements IFilter {
     return getBit(this.mask, NETWORK_FILTER_MASK.isBadFilter);
   }
 
-  public isTo() {
-    return getBit(this.mask, NETWORK_FILTER_MASK.isTo);
-  }
-
   public isUnicode() {
     return getBit(this.mask, NETWORK_FILTER_MASK.isUnicode);
   }
diff --git a/packages/adblocker/test/parsing.test.ts b/packages/adblocker/test/parsing.test.ts
index f06664900a..5149de76c7 100644
--- a/packages/adblocker/test/parsing.test.ts
+++ b/packages/adblocker/test/parsing.test.ts
@@ -805,12 +805,16 @@ describe('Network filters', () => {
       });
 
       context('to', () => {
-        it('fails when both denyallow and to used', () => {
-          network('||foo.com$denyallow=foo.com,to=bar.com', null);
-          network('||foo.com$to=foo.com,denyallow=bar.com', null);
-        });
-
         it('reverses domains condition', () => {
+          network('||foo.com$to=foo.com|~bar.com,denyallow=bar.com|~foo.com', {
+            denyallow: {
+              hostnames: h(['bar.com']),
+              entities: undefined,
+              notHostnames: h(['foo.com']),
+              notEntities: undefined,
+              parts: undefined,
+            },
+          });
           network('||foo.com$to=bar.com|baz.com', {
             denyallow: {
               hostnames: undefined,