Add HNTrieRef.dump() and STrieRef.dump() as dev tool

To be used at the console, as an investigation tool for
development purpose.

Using it to verify the content of the largest
FilterHostnameDict instance, I spotted an all-uppercase
hostname in the HNTrieRef instance:

µBlock.staticNetFilteringEngine.categories.get(0).get(0x10000000).dict.dump();

Thus the changes to static-net-filtering.js are to fix
the erroneous insertion of filters with uppercase
characters. The single instance found was a hostname entry
in Malware Domain List (TRIANGLESERVICESLTD dot COM).

src/js/hntrie.js

@@ -610,6 +610,20 @@ HNTrieContainer.prototype.HNTrieRef = class {
         return this.last;
     }
 
+    dump() {
+        let hostnames = Array.from(this);
+        if ( String.prototype.padStart instanceof Function ) {
+            const maxlen = Math.min(
+                hostnames.reduce((maxlen, hn) => Math.max(maxlen, hn.length), 0),
+                64
+            );
+            hostnames = hostnames.map(hn => hn.padStart(maxlen));
+        }
+        for ( const hn of hostnames ) {
+            console.log(hn);
+        }
+    }
+
     [Symbol.iterator]() {
         return {
             value: undefined,

src/js/static-net-filtering.js

@@ -1737,10 +1737,8 @@ const FilterParser = function() {
     this.reBadDomainOptChars = /[*+?^${}()[\]\\]/;
     this.reHostnameRule1 = /^[0-9a-z][0-9a-z.-]*[0-9a-z]$/i;
     this.reHostnameRule2 = /^[0-9a-z][0-9a-z.-]*[0-9a-z]\^?$/i;
-    this.reCleanupHostnameRule2 = /\^$/g;
     this.reCanTrimCarets1 = /^[^*]*$/;
     this.reCanTrimCarets2 = /^\^?[^^]+[^^][^^]+\^?$/;
-    this.reHasUppercase = /[A-Z]/;
     this.reIsolateHostname = /^(\*?\.)?([^\x00-\x24\x26-\x2C\x2F\x3A-\x5E\x60\x7B-\x7F]+)(.*)/;
     this.reHasUnicode = /[^\x00-\x7F]/;
     this.reWebsocketAny = /^ws[s*]?(?::\/?\/?)?\*?$/;
@@ -1990,18 +1988,18 @@ FilterParser.prototype.parse = function(raw) {
     // important!
     this.reset();
 
-    var s = this.raw = raw;
+    let s = this.raw = raw;
 
     // plain hostname? (from HOSTS file)
     if ( this.reHostnameRule1.test(s) ) {
-        this.f = s;
+        this.f = s.toLowerCase();
         this.hostnamePure = true;
         this.anchor |= 0x4;
         return this;
     }
 
     // element hiding filter?
-    var pos = s.indexOf('#');
+    let pos = s.indexOf('#');
     if ( pos !== -1 ) {
         var c = s.charAt(pos + 1);
         if ( c === '#' || c === '@' ) {
@@ -2093,7 +2091,10 @@ FilterParser.prototype.parse = function(raw) {
         // A filter can't be a pure-hostname one if there is a domain or csp
         // option present.
         if ( this.reHostnameRule2.test(s) ) {
-            this.f = s.replace(this.reCleanupHostnameRule2, '');
+            if ( s.charCodeAt(s.length - 1) === 0x5E /* '^' */ ) {
+                s = s.slice(0, -1);
+            }
+            this.f = s.toLowerCase();
             this.hostnamePure = true;
             return this;
         }
@@ -2138,11 +2139,7 @@ FilterParser.prototype.parse = function(raw) {
     }
 
     this.wildcarded = reIsWildcarded.test(s);
-
-    // This might look weird but we gain memory footprint by not going through
-    // toLowerCase(), at least on Chromium. Because copy-on-write?
-
-    this.f = this.reHasUppercase.test(s) ? s.toLowerCase() : s;
+    this.f = s.toLowerCase();
 
     return this;
 };

src/js/strie.js

@@ -385,6 +385,12 @@ STrieContainer.prototype.STrieRef = class {
         return this.container.matches(this.iroot, a, al);
     }
 
+    dump() {
+        for ( const s of this ) {
+            console.log(s);
+        }
+    }
+
     [Symbol.iterator]() {
         return {
             value: undefined,
@@ -408,8 +414,8 @@ STrieContainer.prototype.STrieRef = class {
                     let i0 = this.container.buf32[STRIE_CHAR0_SLOT] + (v & 0x00FFFFFF);
                     const i1 = i0 + (v >>> 24);
                     while ( i0 < i1 ) {
-                        this.charPtr -= 1;
                         this.charBuf[this.charPtr] = this.container.buf[i0];
+                        this.charPtr += 1;
                         i0 += 1;
                     }
                     this.icell = this.container.buf32[this.icell+1];
@@ -424,14 +430,14 @@ STrieContainer.prototype.STrieRef = class {
             },
             toPattern: function() {
                 this.value = this.textDecoder.decode(
-                    new Uint8Array(this.charBuf.buffer, this.charPtr)
+                    new Uint8Array(this.charBuf.buffer, 0, this.charPtr)
                 );
                 return this;
             },
             container: this.container,
             icell: this.iroot,
             charBuf: new Uint8Array(256),
-            charPtr: 256,
+            charPtr: 0,
             forks: [],
             textDecoder: new TextDecoder()
         };