LibWeb: Add window.open feature detection abstract operations

Userland/Libraries/LibWeb/HTML/Window.cpp

@@ -6,6 +6,7 @@
  */
 
 #include <AK/Base64.h>
+#include <AK/GenericLexer.h>
 #include <AK/String.h>
 #include <AK/Utf8View.h>
 #include <LibJS/Runtime/AbstractOperations.h>
@@ -47,6 +48,7 @@
 #include <LibWeb/HTML/WindowProxy.h>
 #include <LibWeb/HighResolutionTime/Performance.h>
 #include <LibWeb/HighResolutionTime/TimeOrigin.h>
+#include <LibWeb/Infra/CharacterTypes.h>
 #include <LibWeb/Layout/InitialContainingBlock.h>
 #include <LibWeb/Page/Page.h>
 #include <LibWeb/RequestIdleCallback/IdleDeadline.h>
@@ -120,6 +122,181 @@ CSS::Screen& Window::screen()
     return *m_screen;
 }
 
+// https://html.spec.whatwg.org/multipage/nav-history-apis.html#normalizing-the-feature-name
+static StringView normalize_feature_name(StringView name)
+{
+    // For legacy reasons, there are some aliases of some feature names. To normalize a feature name name, switch on name:
+
+    // "screenx"
+    if (name == "screenx"sv) {
+        // Return "left".
+        return "left"sv;
+    }
+    // "screeny"
+    else if (name == "screeny"sv) {
+        // Return "top".
+        return "top"sv;
+    }
+    // "innerwidth"
+    else if (name == "innerwidth"sv) {
+        // Return "width".
+        return "width"sv;
+    }
+    // "innerheight"
+    else if (name == "innerheight") {
+        // Return "height".
+        return "height"sv;
+    }
+    // Anything else
+    else {
+        // Return name.
+        return name;
+    }
+}
+
+// https://html.spec.whatwg.org/multipage/nav-history-apis.html#concept-window-open-features-tokenize
+static OrderedHashMap<String, String> tokenize_open_features(StringView features)
+{
+    // 1. Let tokenizedFeatures be a new ordered map.
+    OrderedHashMap<String, String> tokenized_features;
+
+    // 2. Let position point at the first code point of features.
+    GenericLexer lexer(features);
+
+    // https://html.spec.whatwg.org/multipage/nav-history-apis.html#feature-separator
+    auto is_feature_separator = [](auto character) {
+        return Infra::is_ascii_whitespace(character) || character == '=' || character == ',';
+    };
+
+    // 3. While position is not past the end of features:
+    while (!lexer.is_eof()) {
+        // 1. Let name be the empty string.
+        String name;
+
+        // 2. Let value be the empty string.
+        String value;
+
+        // 3. Collect a sequence of code points that are feature separators from features given position. This skips past leading separators before the name.
+        lexer.ignore_while(is_feature_separator);
+
+        // 4. Collect a sequence of code points that are not feature separators from features given position. Set name to the collected characters, converted to ASCII lowercase.
+        name = lexer.consume_until(is_feature_separator).to_lowercase_string();
+
+        // 5. Set name to the result of normalizing the feature name name.
+        name = normalize_feature_name(name);
+
+        // 6. While position is not past the end of features and the code point at position in features is not U+003D (=):
+        //    1. If the code point at position in features is U+002C (,), or if it is not a feature separator, then break.
+        //    2. Advance position by 1.
+        lexer.ignore_while(Infra::is_ascii_whitespace);
+
+        // 7. If the code point at position in features is a feature separator:
+        //    1. While position is not past the end of features and the code point at position in features is a feature separator:
+        //       1. If the code point at position in features is U+002C (,), then break.
+        //       2. Advance position by 1.
+        lexer.ignore_while([](auto character) { return Infra::is_ascii_whitespace(character) || character == '='; });
+
+        // 2. Collect a sequence of code points that are not feature separators code points from features given position. Set value to the collected code points, converted to ASCII lowercase.
+        value = lexer.consume_until(is_feature_separator).to_lowercase_string();
+
+        // 8. If name is not the empty string, then set tokenizedFeatures[name] to value.
+        if (!name.is_empty())
+            tokenized_features.set(move(name), move(value));
+    }
+
+    // 4. Return tokenizedFeatures.
+    return tokenized_features;
+}
+
+// https://html.spec.whatwg.org/multipage/nav-history-apis.html#concept-window-open-features-parse-boolean
+static bool parse_boolean_feature(StringView value)
+{
+    // 1. If value is the empty string, then return true.
+    if (value.is_empty())
+        return true;
+
+    // 2. If value is "yes", then return true.
+    if (value == "yes"sv)
+        return true;
+
+    // 3. If value is "true", then return true.
+    if (value == "true"sv)
+        return true;
+
+    // 4. Let parsed be the result of parsing value as an integer.
+    auto parsed = value.to_int<i64>();
+
+    // 5. If parsed is an error, then set it to 0.
+    if (!parsed.has_value())
+        parsed = 0;
+
+    // 6. Return false if parsed is 0, and true otherwise.
+    return *parsed != 0;
+}
+
+//  https://html.spec.whatwg.org/multipage/window-object.html#popup-window-is-requested
+static bool check_if_a_popup_window_is_requested(OrderedHashMap<String, String> const& tokenized_features)
+{
+    // 1. If tokenizedFeatures is empty, then return false.
+    if (tokenized_features.is_empty())
+        return false;
+
+    // 2. If tokenizedFeatures["popup"] exists, then return the result of parsing tokenizedFeatures["popup"] as a boolean feature.
+    if (auto popup_feature = tokenized_features.get("popup"sv); popup_feature.has_value())
+        return parse_boolean_feature(*popup_feature);
+
+    // https://html.spec.whatwg.org/multipage/window-object.html#window-feature-is-set
+    auto check_if_a_window_feature_is_set = [&](StringView feature_name, bool default_value) {
+        // 1. If tokenizedFeatures[featureName] exists, then return the result of parsing tokenizedFeatures[featureName] as a boolean feature.
+        if (auto feature = tokenized_features.get(feature_name); feature.has_value())
+            return parse_boolean_feature(*feature);
+
+        // 2. Return defaultValue.
+        return default_value;
+    };
+
+    // 3. Let location be the result of checking if a window feature is set, given tokenizedFeatures, "location", and false.
+    auto location = check_if_a_window_feature_is_set("location"sv, false);
+
+    // 4. Let toolbar be the result of checking if a window feature is set, given tokenizedFeatures, "toolbar", and false.
+    auto toolbar = check_if_a_window_feature_is_set("toolbar"sv, false);
+
+    // 5. If location and toolbar are both false, then return true.
+    if (!location && !toolbar)
+        return true;
+
+    // 6. Let menubar be the result of checking if a window feature is set, given tokenizedFeatures, menubar", and false.
+    auto menubar = check_if_a_window_feature_is_set("menubar"sv, false);
+
+    // 7. If menubar is false, then return true.
+    if (!menubar)
+        return true;
+
+    // 8. Let resizable be the result of checking if a window feature is set, given tokenizedFeatures, "resizable", and true.
+    auto resizable = check_if_a_window_feature_is_set("resizable"sv, true);
+
+    // 9. If resizable is false, then return true.
+    if (!resizable)
+        return true;
+
+    // 10. Let scrollbars be the result of checking if a window feature is set, given tokenizedFeatures, "scrollbars", and false.
+    auto scrollbars = check_if_a_window_feature_is_set("scrollbars"sv, false);
+
+    // 11. If scrollbars is false, then return true.
+    if (!scrollbars)
+        return true;
+
+    // 12. Let status be the result of checking if a window feature is set, given tokenizedFeatures, "status", and false.
+    auto status = check_if_a_window_feature_is_set("status"sv, false);
+
+    // 13. If status is false, then return true.
+    if (!status)
+        return true;
+
+    // 14. Return false.
+    return false;
+}
+
 void Window::alert_impl(String const& message)
 {
     if (auto* page = this->page())