Remove meta viewport and @viewport CSS rules.

sky/engine/core/html/HTMLMetaElement-in.cpp

Index: sky/engine/core/html/HTMLMetaElement-in.cpp
diff --git a/sky/engine/core/html/HTMLMetaElement-in.cpp b/sky/engine/core/html/HTMLMetaElement-in.cpp
index 88de611037f3ff03db9ec6c375c6e9a3abe45128..b4aff44f833a311e7f0141a5f947ec9d14c61d61 100644
--- a/sky/engine/core/html/HTMLMetaElement-in.cpp
+++ b/sky/engine/core/html/HTMLMetaElement-in.cpp
@@ -34,20 +34,6 @@
 
 namespace blink {
 
-#define DEFINE_ARRAY_FOR_MATCHING(name, source, maxMatchLength) \
-const UChar* name; \
-const unsigned uMaxMatchLength = maxMatchLength; \
-UChar characterBuffer[uMaxMatchLength]; \
-if (!source.is8Bit()) { \
-    name = source.characters16(); \
-} else { \
-    unsigned bufferLength = std::min(uMaxMatchLength, source.length()); \
-    const LChar* characters8 = source.characters8(); \
-    for (unsigned i = 0; i < bufferLength; ++i) \
-        characterBuffer[i] = characters8[i]; \
-    name = characterBuffer; \
-}
-
 inline HTMLMetaElement::HTMLMetaElement(Document& document)
     : HTMLElement(HTMLNames::metaTag, document)
 {
@@ -56,365 +42,6 @@ inline HTMLMetaElement::HTMLMetaElement(Document& document)
 
 DEFINE_NODE_FACTORY(HTMLMetaElement)
 
-static bool isInvalidSeparator(UChar c)
-{
-    return c == ';';
-}
-
-// Though isspace() considers \t and \v to be whitespace, Win IE doesn't.
-static bool isSeparator(UChar c)
-{
-    return c == ' ' || c == '\t' || c == '\n' || c == '\r' || c == '=' || c == ',' || c == '\0';
-}
-
-void HTMLMetaElement::parseContentAttribute(const String& content, KeyValuePairCallback callback, void* data)
-{
-    bool error = false;
-
-    // Tread lightly in this code -- it was specifically designed to mimic Win IE's parsing behavior.
-    unsigned keyBegin, keyEnd;
-    unsigned valueBegin, valueEnd;
-
-    String buffer = content.lower();
-    unsigned length = buffer.length();
-    for (unsigned i = 0; i < length; /* no increment here */) {
-        // skip to first non-separator, but don't skip past the end of the string
-        while (isSeparator(buffer[i])) {
-            if (i >= length)
-                break;
-            i++;
-        }
-        keyBegin = i;
-
-        // skip to first separator
-        while (!isSeparator(buffer[i])) {
-            error |= isInvalidSeparator(buffer[i]);
-            if (i >= length)
-                break;
-            i++;
-        }
-        keyEnd = i;
-
-        // skip to first '=', but don't skip past a ',' or the end of the string
-        while (buffer[i] != '=') {
-            error |= isInvalidSeparator(buffer[i]);
-            if (buffer[i] == ',' || i >= length)
-                break;
-            i++;
-        }
-
-        // skip to first non-separator, but don't skip past a ',' or the end of the string
-        while (isSeparator(buffer[i])) {
-            if (buffer[i] == ',' || i >= length)
-                break;
-            i++;
-        }
-        valueBegin = i;
-
-        // skip to first separator
-        while (!isSeparator(buffer[i])) {
-            error |= isInvalidSeparator(buffer[i]);
-            if (i >= length)
-                break;
-            i++;
-        }
-        valueEnd = i;
-
-        ASSERT_WITH_SECURITY_IMPLICATION(i <= length);
-
-        String keyString = buffer.substring(keyBegin, keyEnd - keyBegin);
-        String valueString = buffer.substring(valueBegin, valueEnd - valueBegin);
-        (this->*callback)(keyString, valueString, data);
-    }
-    if (error) {
-        String message = "Error parsing a meta element's content: ';' is not a valid key-value pair separator. Please use ',' instead.";
-        document().addConsoleMessage(ConsoleMessage::create(RenderingMessageSource, WarningMessageLevel, message));
-    }
-}
-
-static inline float clampLengthValue(float value)
-{
-    // Limits as defined in the css-device-adapt spec.
-    if (value != ViewportDescription::ValueAuto)
-        return std::min(float(10000), std::max(value, float(1)));
-    return value;
-}
-
-static inline float clampScaleValue(float value)
-{
-    // Limits as defined in the css-device-adapt spec.
-    if (value != ViewportDescription::ValueAuto)
-        return std::min(float(10), std::max(value, float(0.1)));
-    return value;
-}
-
-float HTMLMetaElement::parsePositiveNumber(const String& keyString, const String& valueString, bool* ok)
-{
-    size_t parsedLength;
-    float value;
-    if (valueString.is8Bit())
-        value = charactersToFloat(valueString.characters8(), valueString.length(), parsedLength);
-    else
-        value = charactersToFloat(valueString.characters16(), valueString.length(), parsedLength);
-    if (!parsedLength) {
-        reportViewportWarning(UnrecognizedViewportArgumentValueError, valueString, keyString);
-        if (ok)
-            *ok = false;
-        return 0;
-    }
-    if (parsedLength < valueString.length())
-        reportViewportWarning(TruncatedViewportArgumentValueError, valueString, keyString);
-    if (ok)
-        *ok = true;
-    return value;
-}
-
-Length HTMLMetaElement::parseViewportValueAsLength(const String& keyString, const String& valueString)
-{
-    // 1) Non-negative number values are translated to px lengths.
-    // 2) Negative number values are translated to auto.
-    // 3) device-width and device-height are used as keywords.
-    // 4) Other keywords and unknown values translate to 0.0.
-
-    unsigned length = valueString.length();
-    DEFINE_ARRAY_FOR_MATCHING(characters, valueString, 13);
-    SWITCH(characters, length) {
-        CASE("device-width") {
-            return Length(DeviceWidth);
-        }
-        CASE("device-height") {
-            return Length(DeviceHeight);
-        }
-    }
-
-    float value = parsePositiveNumber(keyString, valueString);
-
-    if (value < 0)
-        return Length(); // auto
-
-    return Length(clampLengthValue(value), Fixed);
-}
-
-float HTMLMetaElement::parseViewportValueAsZoom(const String& keyString, const String& valueString, bool& computedValueMatchesParsedValue)
-{
-    // 1) Non-negative number values are translated to <number> values.
-    // 2) Negative number values are translated to auto.
-    // 3) yes is translated to 1.0.
-    // 4) device-width and device-height are translated to 10.0.
-    // 5) no and unknown values are translated to 0.0
-
-    computedValueMatchesParsedValue = false;
-    unsigned length = valueString.length();
-    DEFINE_ARRAY_FOR_MATCHING(characters, valueString, 13);
-    SWITCH(characters, length) {
-        CASE("yes") {
-            return 1;
-        }
-        CASE("no") {
-            return 0;
-        }
-        CASE("device-width") {
-            return 10;
-        }
-        CASE("device-height") {
-            return 10;
-        }
-    }
-
-    float value = parsePositiveNumber(keyString, valueString);
-
-    if (value < 0)
-        return ViewportDescription::ValueAuto;
-
-    if (value > 10.0)
-        reportViewportWarning(MaximumScaleTooLargeError, String(), String());
-
-    float clampedValue = clampScaleValue(value);
-    if (clampedValue == value)
-        computedValueMatchesParsedValue = true;
-
-    return clampedValue;
-}
-
-bool HTMLMetaElement::parseViewportValueAsUserZoom(const String& keyString, const String& valueString, bool& computedValueMatchesParsedValue)
-{
-    // yes and no are used as keywords.
-    // Numbers >= 1, numbers <= -1, device-width and device-height are mapped to yes.
-    // Numbers in the range <-1, 1>, and unknown values, are mapped to no.
-
-    computedValueMatchesParsedValue = false;
-    unsigned length = valueString.length();
-    DEFINE_ARRAY_FOR_MATCHING(characters, valueString, 13);
-    SWITCH(characters, length) {
-        CASE("yes") {
-            computedValueMatchesParsedValue = true;
-            return true;
-        }
-        CASE("no") {
-            computedValueMatchesParsedValue = true;
-            return false;
-        }
-        CASE("device-width") {
-            return true;
-        }
-        CASE("device-height") {
-            return true;
-        }
-    }
-
-    float value = parsePositiveNumber(keyString, valueString);
-    if (fabs(value) < 1)
-        return false;
-
-    return true;
-}
-
-float HTMLMetaElement::parseViewportValueAsDPI(const String& keyString, const String& valueString)
-{
-    unsigned length = valueString.length();
-    DEFINE_ARRAY_FOR_MATCHING(characters, valueString, 10);
-    SWITCH(characters, length) {
-        CASE("device-dpi") {
-            return ViewportDescription::ValueDeviceDPI;
-        }
-        CASE("low-dpi") {
-            return ViewportDescription::ValueLowDPI;
-        }
-        CASE("medium-dpi") {
-            return ViewportDescription::ValueMediumDPI;
-        }
-        CASE("high-dpi") {
-            return ViewportDescription::ValueHighDPI;
-        }
-    }
-
-    bool ok;
-    float value = parsePositiveNumber(keyString, valueString, &ok);
-    if (!ok || value < 70 || value > 400)
-        return ViewportDescription::ValueAuto;
-
-    return value;
-}
-
-void HTMLMetaElement::processViewportKeyValuePair(const String& keyString, const String& valueString, void* data)
-{
-    ViewportDescription* description = static_cast<ViewportDescription*>(data);
-
-    unsigned length = keyString.length();
-
-    DEFINE_ARRAY_FOR_MATCHING(characters, keyString, 17);
-    SWITCH(characters, length) {
-        CASE("width") {
-            const Length& width = parseViewportValueAsLength(keyString, valueString);
-            if (width.isAuto())
-                return;
-            description->minWidth = Length(ExtendToZoom);
-            description->maxWidth = width;
-            return;
-        }
-        CASE("height") {
-            const Length& height = parseViewportValueAsLength(keyString, valueString);
-            if (height.isAuto())
-                return;
-            description->minHeight = Length(ExtendToZoom);
-            description->maxHeight = height;
-            return;
-        }
-        CASE("initial-scale") {
-            description->zoom = parseViewportValueAsZoom(keyString, valueString, description->zoomIsExplicit);
-            return;
-        }
-        CASE("minimum-scale") {
-            description->minZoom = parseViewportValueAsZoom(keyString, valueString, description->minZoomIsExplicit);
-            return;
-        }
-        CASE("maximum-scale") {
-            description->maxZoom = parseViewportValueAsZoom(keyString, valueString, description->maxZoomIsExplicit);
-            return;
-        }
-        CASE("user-scalable") {
-            description->userZoom = parseViewportValueAsUserZoom(keyString, valueString, description->userZoomIsExplicit);
-            return;
-        }
-        CASE("target-densitydpi") {
-            description->deprecatedTargetDensityDPI = parseViewportValueAsDPI(keyString, valueString);
-            reportViewportWarning(TargetDensityDpiUnsupported, String(), String());
-            return;
-        }
-        CASE("minimal-ui") {
-            // Ignore vendor-specific argument.
-            return;
-        }
-    }
-    reportViewportWarning(UnrecognizedViewportArgumentKeyError, keyString, String());
-}
-
-static const char* viewportErrorMessageTemplate(ViewportErrorCode errorCode)
-{
-    static const char* const errors[] = {
-        "The key \"%replacement1\" is not recognized and ignored.",
-        "The value \"%replacement1\" for key \"%replacement2\" is invalid, and has been ignored.",
-        "The value \"%replacement1\" for key \"%replacement2\" was truncated to its numeric prefix.",
-        "The value for key \"maximum-scale\" is out of bounds and the value has been clamped.",
-        "The key \"target-densitydpi\" is not supported.",
-    };
-
-    return errors[errorCode];
-}
-
-static MessageLevel viewportErrorMessageLevel(ViewportErrorCode errorCode)
-{
-    switch (errorCode) {
-    case TruncatedViewportArgumentValueError:
-    case TargetDensityDpiUnsupported:
-    case UnrecognizedViewportArgumentKeyError:
-    case UnrecognizedViewportArgumentValueError:
-    case MaximumScaleTooLargeError:
-        return WarningMessageLevel;
-    }
-
-    ASSERT_NOT_REACHED();
-    return ErrorMessageLevel;
-}
-
-void HTMLMetaElement::reportViewportWarning(ViewportErrorCode errorCode, const String& replacement1, const String& replacement2)
-{
-    if (!document().frame())
-        return;
-
-    String message = viewportErrorMessageTemplate(errorCode);
-    if (!replacement1.isNull())
-        message.replace("%replacement1", replacement1);
-    if (!replacement2.isNull())
-        message.replace("%replacement2", replacement2);
-
-    // FIXME: This message should be moved off the console once a solution to https://bugs.webkit.org/show_bug.cgi?id=103274 exists.
-    document().addConsoleMessage(ConsoleMessage::create(RenderingMessageSource, viewportErrorMessageLevel(errorCode), message));
-}
-
-void HTMLMetaElement::processViewportContentAttribute(const String& content, ViewportDescription::Type origin)
-{
-    ASSERT(!content.isNull());
-
-    if (!document().shouldOverrideLegacyDescription(origin))
-        return;
-
-    ViewportDescription descriptionFromLegacyTag(origin);
-
-    parseContentAttribute(content, &HTMLMetaElement::processViewportKeyValuePair, (void*)&descriptionFromLegacyTag);
-
-    if (descriptionFromLegacyTag.minZoom == ViewportDescription::ValueAuto)
-        descriptionFromLegacyTag.minZoom = 0.25;
-
-    if (descriptionFromLegacyTag.maxZoom == ViewportDescription::ValueAuto) {
-        descriptionFromLegacyTag.maxZoom = 5;
-        descriptionFromLegacyTag.minZoom = std::min(descriptionFromLegacyTag.minZoom, float(5));
-    }
-
-    document().setViewportDescription(descriptionFromLegacyTag);
-}
-
-
 void HTMLMetaElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
 {
     if (name == HTMLNames::http_equivAttr || name == HTMLNames::contentAttr) {
@@ -448,16 +75,8 @@ void HTMLMetaElement::process()
         return;
 
     const AtomicString& nameValue = getAttribute(HTMLNames::nameAttr);
-    if (!nameValue.isEmpty()) {
-        if (equalIgnoringCase(nameValue, "viewport"))
-            processViewportContentAttribute(contentValue, ViewportDescription::ViewportMeta);
-        else if (equalIgnoringCase(nameValue, "referrer"))
-            document().processReferrerPolicy(contentValue);
-        else if (equalIgnoringCase(nameValue, "handheldfriendly") && equalIgnoringCase(contentValue, "true"))
-            processViewportContentAttribute("width=device-width", ViewportDescription::HandheldFriendlyMeta);
-        else if (equalIgnoringCase(nameValue, "mobileoptimized"))
-            processViewportContentAttribute("width=device-width, initial-scale=1", ViewportDescription::MobileOptimizedMeta);
-    }
+    if (!nameValue.isEmpty() && equalIgnoringCase(nameValue, "referrer"))
+        document().processReferrerPolicy(contentValue);
 
     // Get the document to process the tag, but only if we're actually part of DOM
     // tree (changing a meta tag while it's not in the tree shouldn't have any effect