third_party/WebKit/Source/core/html/HTMLMetaElement.h

   1 /*
   2  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
   3  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
   4  * Copyright (C) 2003, 2010 Apple Inc. All rights reserved.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Library General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Library General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Library General Public License
  17  * along with this library; see the file COPYING.LIB.  If not, write to
  18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19  * Boston, MA 02110-1301, USA.
  20  *
  21  */
  22
  23 #ifndef HTMLMetaElement_h
  24 #define HTMLMetaElement_h
  25
  26 #include "core/CoreExport.h"
  27 #include "core/dom/ViewportDescription.h"
  28 #include "core/html/HTMLElement.h"
  29
  30 namespace blink {
  31
  32 enum ViewportErrorCode {
  33     UnrecognizedViewportArgumentKeyError,
  34     UnrecognizedViewportArgumentValueError,
  35     TruncatedViewportArgumentValueError,
  36     MaximumScaleTooLargeError,
  37     TargetDensityDpiUnsupported
  38 };
  39
  40 class CORE_EXPORT HTMLMetaElement final : public HTMLElement {
  41     DEFINE_WRAPPERTYPEINFO();
  42 public:
  43     DECLARE_NODE_FACTORY(HTMLMetaElement);
  44
  45     static void getViewportDescriptionFromContentAttribute(const String& content, ViewportDescription&, Document*, bool viewportMetaZeroValuesQuirk);
  46
  47     const AtomicString& content() const;
  48     const AtomicString& httpEquiv() const;
  49     const AtomicString& name() const;
  50
  51 private:
  52     explicit HTMLMetaElement(Document&);
  53
  54     static void processViewportKeyValuePair(Document*, const String& key, const String& value, bool viewportMetaZeroValuesQuirk, void* data);
  55     static void parseContentAttribute(const String& content, void* data, Document*, bool viewportMetaZeroValuesQuirk);
  56
  57     void parseAttribute(const QualifiedName&, const AtomicString&) override;
  58     InsertionNotificationRequest insertedInto(ContainerNode*) override;
  59     void didNotifySubtreeInsertionsToDocument() override;
  60
  61     static float parsePositiveNumber(Document*, const String& key, const String& value, bool* ok = 0);
  62
  63     static Length parseViewportValueAsLength(Document*, const String& key, const String& value);
  64     static float parseViewportValueAsZoom(Document*, const String& key, const String& value, bool& computedValueMatchesParsedValue, bool viewportMetaZeroValuesQuirk);
  65     static bool parseViewportValueAsUserZoom(Document*, const String& key, const String& value, bool& computedValueMatchesParsedValue);
  66     static float parseViewportValueAsDPI(Document*, const String& key, const String& value);
  67
  68     static void reportViewportWarning(Document*, ViewportErrorCode, const String& replacement1, const String& replacement2);
  69
  70     void process();
  71     void processViewportContentAttribute(const String& content, ViewportDescription::Type origin);
  72 };
  73
  74 } // namespace blink
  75
  76 #endif // HTMLMetaElement_h