Add basic compatibility with ABP's `rewrite` option

Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/857

The recognized resources are:
- abp-resource:blank-mp3
- abp-resource:blank-js

ABP's tokens are excluded from auto-complete so as to not
get in the way of uBO's filter list maintainers.

src/js/codemirror/ubo-static-filtering.js

@@ -185,7 +185,7 @@ CodeMirror.defineMode('ubo-static-filtering', function() {
         // Warn about unknown redirect tokens.
         if (
             string.charCodeAt(pos - 1) === 0x3D /* '=' */ &&
-            /[$,]redirect(-rule)?=$/.test(string.slice(0, pos))
+            /[$,](redirect(-rule)?|rewrite)=$/.test(string.slice(0, pos))
         ) {
             style = 'value';
             const end = parser.skipUntil(
@@ -418,6 +418,12 @@ const initHints = function() {
             return (item[1] & 0b01) !== 0;
         })
     );
+    const excludedHints = new Set([
+        'genericblock',
+        'object-subrequest',
+        'rewrite',
+        'webrtc',
+    ]);
 
     const pickBestHints = function(cursor, seedLeft, seedRight, hints) {
         const seed = (seedLeft + seedRight).trim();
@@ -471,6 +477,7 @@ const initHints = function() {
         const isException = parser.isException();
         const hints = [];
         for ( let [ text, bits ] of parser.netOptionTokenDescriptors ) {
+            if ( excludedHints.has(text) ) { continue; }
             if ( isNegated && (bits & parser.OPTCanNegate) === 0 ) { continue; }
             if ( isException ) {
                 if ( (bits & parser.OPTBlockOnly) !== 0 ) { continue; }
@@ -488,6 +495,7 @@ const initHints = function() {
     const getNetRedirectHints = function(cursor, seedLeft, seedRight) {
         const hints = [];
         for ( const text of redirectNames.keys() ) {
+            if ( text.startsWith('abp-resource:') ) { continue; }
             hints.push(text);
         }
         return pickBestHints(cursor, seedLeft, seedRight, hints);
@@ -495,7 +503,10 @@ const initHints = function() {
 
     const getNetHints = function(cursor, line) {
         const beg = cursor.ch;
-        if ( parser.optionsSpan.len === 0 ) {
+        if (
+            parser.optionsAnchorSpan.len === 0 &&
+            line.endsWith('$') === false
+        ) {
             if ( /[^\w\x80-\xF4#,.-]/.test(line) === false ) {
                 return getOriginHints(cursor, line);
             }
@@ -511,7 +522,7 @@ const initHints = function() {
         if ( assignPos === -1 ) {
             return getNetOptionHints(cursor, matchLeft[0], matchRight[0]);
         }
-        if ( /^redirect(-rule)?=/.test(matchLeft[0]) ) {
+        if ( /^(redirect(-rule)?|rewrite)=/.test(matchLeft[0]) ) {
             return getNetRedirectHints(
                 cursor,
                 matchLeft[0].slice(assignPos + 1),

src/js/pagestore.js

@@ -377,16 +377,15 @@ const PageStore = class {
     setFrameURL(frameId, frameURL) {
         let frameStore = this.frames.get(frameId);
         if ( frameStore !== undefined ) {
-            if ( frameURL !== frameStore.rawURL ) {
-                frameStore.init(frameURL);
-            }
-        } else {
-            frameStore = FrameStore.factory(frameURL);
-            this.frames.set(frameId, frameStore);
-            this.frameAddCount += 1;
-            if ( (this.frameAddCount & 0b111111) === 0 ) {
-                this.pruneFrames();
-            }
+            return frameURL === frameStore.rawURL
+                ? frameStore
+                : frameStore.init(frameURL);
+        }
+        frameStore = FrameStore.factory(frameURL);
+        this.frames.set(frameId, frameStore);
+        this.frameAddCount += 1;
+        if ( (this.frameAddCount & 0b111111) === 0 ) {
+            this.pruneFrames();
         }
         return frameStore;
     }

src/js/redirect-engine.js

@@ -121,7 +121,7 @@ const redirectableResources = new Map([
         data: 'text',
     } ],
     [ 'noop-0.1s.mp3', {
-        alias: 'noopmp3-0.1s',
+        alias: [ 'noopmp3-0.1s', 'abp-resource:blank-mp3' ],
         data: 'blob',
     } ],
     [ 'noop-1s.mp4', {
@@ -132,7 +132,7 @@ const redirectableResources = new Map([
         alias: 'noopframe',
     } ],
     [ 'noop.js', {
-        alias: 'noopjs',
+        alias: [ 'noopjs', 'abp-resource:blank-js' ],
         data: 'text',
     } ],
     [ 'noop.txt', {
@@ -461,7 +461,12 @@ RedirectEngine.prototype.loadBuiltinResources = function() {
             params: details.params,
         });
         this.resources.set(name, entry);
-        if ( details.alias !== undefined ) {
+        if ( details.alias === undefined ) { return; }
+        if ( Array.isArray(details.alias) ) {
+            for ( const alias of details.alias ) {
+                this.aliases.set(alias, name);
+            }
+        } else {
             this.aliases.set(details.alias, name);
         }
     };

src/js/static-filtering-parser.js

@@ -2183,6 +2183,7 @@ const netOptionTokenDescriptors = new Map([
     [ 'queryprune', OPTTokenQueryprune | OPTMayAssign | OPTModifierType | OPTNonCspableType | OPTNonRedirectableType ],
         [ 'removeparam', OPTTokenQueryprune | OPTMayAssign | OPTModifierType | OPTNonCspableType | OPTNonRedirectableType ],
     [ 'redirect', OPTTokenRedirect | OPTMustAssign | OPTAllowMayAssign | OPTModifierType ],
+        [ 'rewrite', OPTTokenRedirect | OPTMustAssign | OPTAllowMayAssign | OPTModifierType ],
     [ 'redirect-rule', OPTTokenRedirectRule | OPTMustAssign | OPTAllowMayAssign | OPTModifierType | OPTNonCspableType ],
     [ 'script', OPTTokenScript | OPTCanNegate | OPTNetworkType | OPTModifiableType | OPTRedirectableType | OPTNonCspableType ],
     [ 'shide', OPTTokenShide | OPTNonNetworkType | OPTNonCspableType | OPTNonRedirectableType ],
@@ -2241,6 +2242,7 @@ Parser.netOptionTokenIds = new Map([
     [ 'queryprune', OPTTokenQueryprune ],
         [ 'removeparam', OPTTokenQueryprune ],
     [ 'redirect', OPTTokenRedirect ],
+        [ 'rewrite', OPTTokenRedirect ],
     [ 'redirect-rule', OPTTokenRedirectRule ],
     [ 'script', OPTTokenScript ],
     [ 'shide', OPTTokenShide ],