Issue 491 - Validate custom filters

qunit/tests/filterValidation.js

Index: qunit/tests/filterValidation.js
===================================================================
new file mode 100644
--- /dev/null
+++ b/qunit/tests/filterValidation.js
@@ -0,0 +1,81 @@
+(function()
+{
+  var filterValidation = require("filterValidation");
+  var parseFilter = filterValidation.parseFilter;
+  var parseFilters = filterValidation.parseFilters;
+
+  var filterClasses = require("filterClasses");
+  var BlockingFilter = filterClasses.BlockingFilter;
+  var ElemHideFilter = filterClasses.ElemHideFilter;
+  var CommentFilter = filterClasses.CommentFilter;
+
+  module("Filter validation");
+
+  test("Detecting invalid filters", function()
+  {
+    throws(parseFilter.bind(null, "||example.com^$unknown"), "unknown option");
+    throws(parseFilter.bind(null, "[foobar]"), "filter list header");
+    throws(parseFilter.bind(null, "##[foo"), "invalid selector");
+
+    throws(parseFilters.bind(null, "!comment\r\n||example.com^\n\n##/"), /\b4\b/, "error contains corresponding line number");
+  });
+
+  test("Allowing valid filters", function()
+  {
+    var text, filter;
+
+    text = "||example.com^";
+    filter = parseFilter(text);
+    ok(filter instanceof BlockingFilter, "blocking filter parsed");
+    equal(filter.text, text, "blocking filter text matches");
+
+    text = '##div:first-child a[src="http://example.com"] > .foo + #bar'
+    filter = parseFilter(text);
+    ok(filter instanceof ElemHideFilter, "elemhide filter parsed");
+    equal(filter.text, text, "elemhide filter text matches");
+
+    text = "! foo bar"
+    filter = parseFilter(text);
+    ok(filter instanceof CommentFilter, "comment filter parsed");
+    equal(filter.text, text, "comment filter text matches");
+
+    equal(parseFilter(""), null, "empty filter parsed as 'null'");
+  });
+
+  test("Normalizing filters", function()
+  {
+    var ws = " \t\r\n";
+
+    equal(parseFilter(ws + "@@" + ws + "||" + ws + "example.com" + ws + "^" + ws).text, "@@||example.com^", "unnecessary spaces");
+    equal(parseFilter(ws), null, "only spaces");
+  });
+
+  test("Parsing multiple filters", function()
+  {
+    var filters = parseFilters("||example.com^\n \n###foobar\r\n! foo bar\n");
+
+    equal(filters.length, 3, "all filters parsed");
+
+    ok(filters[0] instanceof BlockingFilter, "1st filter is blocking");
+    equal(filters[0].text, "||example.com^", "1st filter text matches");
+
+    ok(filters[1] instanceof ElemHideFilter, "2nd filter is elemhide");
+    equal(filters[1].text, "###foobar",      "2nd filter text matches");
+
+    ok(filters[2] instanceof CommentFilter,  "3rd filter is comment");
+    equal(filters[2].text, "! foo bar",      "3rd filter text matches");
+  });
+
+  test("Parsing multiple filters, stripping filter list headers", function()
+  {
+    var filters = parseFilters("[foobar]\n \n||example.com^\r\n! foo bar\n", true);
+
+    equal(filters.length, 2, "all filters parsed");
+
+    ok(filters[0] instanceof BlockingFilter, "1st filter is blocking");
+    equal(filters[0].text, "||example.com^", "1st filter text matches");
+
+    ok(filters[1] instanceof CommentFilter,  "2nd filter is comment");
+    equal(filters[1].text, "! foo bar",      "2nd filter text matches");
+  });
+})();