fix #2264

src/css/whitelist.css

@@ -5,12 +5,36 @@ div > p:last-child {
     margin-bottom: 0;
     }
 #whitelist {
-    box-sizing: border-box;
+    border: 1px solid gray;
     height: 60vh;
-	text-align: left;
+    margin: 0;
+    padding: 1px;
+    position: relative;
+    resize: vertical;
+    }
+#whitelist.invalid {
+    border-color: red;
+    }
+#whitelist textarea {
+    border: none;
+    box-sizing: border-box;
+    height: 100%;
+    padding: 0.4em;
+    resize: none;
+    text-align: left;
     white-space: pre;
     width: 100%;
     }
-#whitelist.bad {
+#whitelist textarea + div {
-    background-color: #fee;
+    background-color: red;
-    }
+    bottom: 0;
+    color: white;
+    display: none;
+    padding: 2px 4px;
+    pointer-events: none;
+    position: absolute;
+    right: 0;
+}
+#whitelist.invalid textarea + div {
+    display: block;
+}

src/js/messaging.js

@@ -1011,6 +1011,10 @@ var onMessage = function(request, sender, callback) {
         response = getRules();
         break;
 
+    case 'validateWhitelistString':
+        response = µb.validateWhitelistString(request.raw);
+        break;
+
     case 'writeHiddenSettings':
         µb.hiddenSettingsFromString(request.content);
         break;

src/js/ublock.js

@@ -194,9 +194,7 @@ var matchBucket = function(url, hostname, bucket, start) {
 
 µBlock.whitelistFromString = function(s) {
     var whitelist = Object.create(null),
-        reInvalidHostname = /[^a-z0-9.\-\[\]:]/,
+        lineIter = new this.LineIterator(s),
-        reHostnameExtractor = /([a-z0-9\[][a-z0-9.\-]*[a-z0-9\]])(?::[\d*]+)?\/(?:[^\x00-\x20\/]|$)[^\x00-\x20]*$/,
-        lines = s.split(/[\n\r]+/),
         line, matches, key, directive, re;
 
     // Comment bucket must always be ready to be used.
@@ -205,8 +203,9 @@ var matchBucket = function(url, hostname, bucket, start) {
     // New set of directives, scrap cached data.
     directiveToRegexpMap.clear();
 
-    for ( var i = 0; i < lines.length; i++ ) {
+    while ( !lineIter.eot() ) {
-        line = lines[i].trim();
+        line = lineIter.next().trim();
+
         // https://github.com/gorhill/uBlock/issues/171
         // Skip empty lines
         if ( line === '' ) {
@@ -228,7 +227,7 @@ var matchBucket = function(url, hostname, bucket, start) {
             }
         }
         // Regex-based (ensure it is valid)
-        else if ( line.startsWith('/') && line.endsWith('/') ) {
+        else if ( line.length > 2 && line.startsWith('/') && line.endsWith('/') ) {
             key = '//';
             directive = line;
             try {
@@ -267,6 +266,28 @@ var matchBucket = function(url, hostname, bucket, start) {
     return whitelist;
 };
 
+µBlock.validateWhitelistString = function(s) {
+    var lineIter = new this.LineIterator(s), line;
+    while ( !lineIter.eot() ) {
+        line = lineIter.next().trim();
+        if ( line === '' ) { continue; }
+        if ( line.startsWith('#') ) { continue; } // Comment
+        if ( line.indexOf('/') === -1 ) { // Plain hostname
+            if ( reInvalidHostname.test(line) ) { return false; }
+            continue;
+        }
+        if ( line.length > 2 && line.startsWith('/') && line.endsWith('/') ) { // Regex-based
+            try { new RegExp(line.slice(1, -1)); } catch(ex) { return false; }
+            continue;
+        }
+        if ( reHostnameExtractor.test(line) === false ) { return false; } // URL
+    }
+    return true;
+};
+
+var reInvalidHostname = /[^a-z0-9.\-\[\]:]/,
+    reHostnameExtractor = /([a-z0-9\[][a-z0-9.\-]*[a-z0-9\]])(?::[\d*]+)?\/(?:[^\x00-\x20\/]|$)[^\x00-\x20]*$/;
+
 /******************************************************************************/
 
 })();

src/js/whitelist.js

@@ -29,30 +29,68 @@
 
 /******************************************************************************/
 
-var messaging = vAPI.messaging;
+var messaging = vAPI.messaging,
-var cachedWhitelist = '';
+    cachedWhitelist = '';
-
-// Could make it more fancy if needed. But speed... It's a compromise.
-var reUnwantedChars = /[\x00-\x09\x0b\x0c\x0e-\x1f!"'()<>{}|`~]/;
 
 /******************************************************************************/
 
-var whitelistChanged = function() {
+var getTextareaNode = function() {
-    var textarea = uDom.nodeFromId('whitelist');
+    var me = getTextareaNode,
-    var s = textarea.value.trim();
+        node = me.theNode;
-    var changed = s === cachedWhitelist;
+    if ( node === undefined ) {
-    var bad = reUnwantedChars.test(s);
+        node = me.theNode = uDom.nodeFromSelector('#whitelist textarea');
-    uDom.nodeFromId('whitelistApply').disabled = changed || bad;
+    }
-    uDom.nodeFromId('whitelistRevert').disabled = changed;
+    return node;
-    textarea.classList.toggle('bad', bad);
 };
 
+var setErrorNodeHorizontalOffset = function(px) {
+    var me = setErrorNodeHorizontalOffset,
+        offset = me.theOffset || 0;
+    if ( px === offset ) { return; }
+    var node = me.theNode;
+    if ( node === undefined ) {
+        node = me.theNode = uDom.nodeFromSelector('#whitelist textarea + div');
+    }
+    node.style.right = px + 'px';
+    me.theOffset = px;
+};
+
+/******************************************************************************/
+
+var whitelistChanged = (function() {
+    var changedWhitelist, changed, timer;
+
+    var updateUI = function(good) {
+        uDom.nodeFromId('whitelistApply').disabled = changed || !good;
+        uDom.nodeFromId('whitelistRevert').disabled = changed;
+        uDom.nodeFromId('whitelist').classList.toggle('invalid', !good);
+    };
+
+    var validate = function() {
+        timer = undefined;
+        messaging.send(
+            'dashboard',
+            { what: 'validateWhitelistString', raw: changedWhitelist },
+            updateUI
+        );
+    };
+
+    return function() {
+        changedWhitelist = getTextareaNode().value.trim();
+        changed = changedWhitelist === cachedWhitelist;
+        if ( timer !== undefined ) { clearTimeout(timer); }
+        timer = vAPI.setTimeout(validate, 251);
+        var textarea = getTextareaNode();
+        setErrorNodeHorizontalOffset(textarea.offsetWidth - textarea.clientWidth);
+    };
+})();
+
 /******************************************************************************/
 
 var renderWhitelist = function() {
     var onRead = function(whitelist) {
         cachedWhitelist = whitelist.trim();
-        uDom.nodeFromId('whitelist').value = cachedWhitelist + '\n';
+        getTextareaNode().value = cachedWhitelist + '\n';
         whitelistChanged();
     };
     messaging.send('dashboard', { what: 'getWhitelist' }, onRead);
@@ -62,8 +100,8 @@ var renderWhitelist = function() {
 
 var handleImportFilePicker = function() {
     var fileReaderOnLoadHandler = function() {
-        var textarea = uDom('#whitelist');
+        var textarea = getTextareaNode();
-        textarea.val([textarea.val(), this.result].join('\n').trim());
+        textarea.value = [textarea.value.trim(), this.result.trim()].join('\n').trim();
         whitelistChanged();
     };
     var file = this.files[0];
@@ -92,10 +130,8 @@ var startImportFilePicker = function() {
 /******************************************************************************/
 
 var exportWhitelistToFile = function() {
-    var val = uDom('#whitelist').val().trim();
+    var val = getTextareaNode().value.trim();
-    if ( val === '' ) {
+    if ( val === '' ) { return; }
-        return;
-    }
     var filename = vAPI.i18n('whitelistExportFilename')
         .replace('{{datetime}}', uBlockDashboard.dateNowToSensibleString())
         .replace(/ +/g, '_');
@@ -108,7 +144,7 @@ var exportWhitelistToFile = function() {
 /******************************************************************************/
 
 var applyChanges = function() {
-    cachedWhitelist = uDom.nodeFromId('whitelist').value.trim();
+    cachedWhitelist = getTextareaNode().value.trim();
     var request = {
         what: 'setWhitelist',
         whitelist: cachedWhitelist
@@ -117,21 +153,21 @@ var applyChanges = function() {
 };
 
 var revertChanges = function() {
-    uDom.nodeFromId('whitelist').value = cachedWhitelist + '\n';
+    getTextareaNode().value = cachedWhitelist + '\n';
     whitelistChanged();
 };
 
 /******************************************************************************/
 
 var getCloudData = function() {
-    return uDom.nodeFromId('whitelist').value;
+    return getTextareaNode().value;
 };
 
 var setCloudData = function(data, append) {
     if ( typeof data !== 'string' ) {
         return;
     }
-    var textarea = uDom.nodeFromId('whitelist');
+    var textarea = getTextareaNode();
     if ( append ) {
         data = uBlockDashboard.mergeNewLines(textarea.value.trim(), data);
     }
@@ -147,7 +183,7 @@ self.cloud.onPull = setCloudData;
 uDom('#importWhitelistFromFile').on('click', startImportFilePicker);
 uDom('#importFilePicker').on('change', handleImportFilePicker);
 uDom('#exportWhitelistToFile').on('click', exportWhitelistToFile);
-uDom('#whitelist').on('input', whitelistChanged);
+uDom('#whitelist textarea').on('input', whitelistChanged);
 uDom('#whitelistApply').on('click', applyChanges);
 uDom('#whitelistRevert').on('click', revertChanges);
 

src/whitelist.html

@@ -17,7 +17,10 @@
 <p>
     <button id="whitelistApply" class="custom important" type="button" disabled="true" data-i18n="whitelistApply"></button>&ensp;
     <button id="whitelistRevert" class="custom" type="button" disabled="true" data-i18n="genericRevert"></button>
-<p><textarea id="whitelist" dir="auto" spellcheck="false"></textarea>
+<p><section id="whitelist">
+    <textarea dir="auto" spellcheck="false"></textarea>
+    <div>E</div>
+    </section>
 <p>
     <button id="importWhitelistFromFile" class="custom" data-i18n="whitelistImport"></button>&ensp;
     <button id="exportWhitelistToFile" class="custom" data-i18n="whitelistExport"></button>